systems and methods for dynamic transmission power limit setback to meet specific absorption rate

专利摘要:
SYSTEMS AND METHODS FOR DYNAMIC TRANSMISSION POWER LIMIT RESETTING TO MEET SPECIFIC ABSORPTION RATE.This description provides systems, methods and apparatus for providing transmit power limit setback for Specific Absorption Rate (SAR) compliance. In one aspect, a method implemented in a wireless communication apparatus is provided. The method includes receiving an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus. The method further includes selecting a plurality of transformations associated with the at least one mode of operation. The method further includes applying a selected transform to adjust a relationship between a transmit power level of a first transmitter and a transmit power level of a second transmitter. The method further includes determining a target transmit power level of the first transmitter based on the adjusted ratio and an actual transmit power level of the second transmitter.
公开号:BR112013022410A2
申请号:R112013022410-0
申请日:2012-03-05
公开日:2021-05-18
发明作者:Francis M. Ngai；John A. Forrester；Rema Vaidyanathan；Brian M. George；Anshul Pandey；Supratik Bhattacharjee；Zhu Ji
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

"SYSTEMS AND METHODS FOR RESETTING THE POWER LIMIT OF
DYNAMIC TRANSMISSION FOR SPECIFIC ABSORPTION RATE COMPLIANCE" Cross Reference to Related Applications 5 This application claims benefit under 35 USC §119(e) to US Provisional Patent Application No. 61/449,512, entitled "DYNAMIC TRANSMISSION POWER LIMIT BACK-OFF FOR SPECIFIC ABSORPTION RATE COMPLIANCE" filed March 4, 2011, the disclosure of which is incorporated herein by reference in its entirety. This application further claims benefit under 35 USC §119(e) to US Provisional Patent Application No. 61/480,191, entitled "DYNAMIC TRANSMISSION POWER LIMIT BACK-OFF FOR SPECIFIC ABSORPTION RATE COMPLIANCE" filed April 28, 2011, the disclosure of which is incorporated herein by reference in its entirety.
Field of the Invention The present application relates generally to communications and more specifically to transmit power levels of a wireless communication device. Description of the Prior Art Wireless communication systems are widely used to provide various types of communication content, such as voice and data. Typical wireless communication systems can be multiple access systems capable of supporting communication with multiple users sharing available system resources (eg bandwidth, transmission power...). Examples of such multiple access systems may include code division multiple access (CDMA), time division multiple access (TDMA) systems, frequency division multiple access (FDMA), frequency division multiple access systems. orthogonal frequency division (OFDMA), and so on. In addition, systems can conform to specifications such as third-generation partnership design (3GPP), 3GPP2, 3GPP Long-Term Evolution (LTE), 5 Advanced LTE (LTE-A), etc. In general, wireless multiple access communication systems can simultaneously support communication to multiple mobile devices. Each mobile device can communicate with one or more base stations through forward and reverse link transmissions. Forward link (or downlink) refers to the communication link from base stations to mobile devices, and reverse link (or uplink) refers to communication link from mobile devices to base stations.
Mobile devices can continue to simultaneously support communication using multiple radio access technologies. Different radio access technologies can be used to expand the scope of services offered by communication, such as expanding the geographic region in which the device can operate, as a mobile device moves through different regions that support different radio access technologies . Furthermore, different radio access technologies can be used simultaneously to allow the user to perform a variety of different forms of wireless communication activities. There is a need to manage transmission characteristics based on operating modes for different radio access technologies.
SUMMARY Various implementations of systems, methods, and devices within the scope of the appended claims each have several aspects, none of which is solely responsible for the desirable attributes described herein. Without limiting the scope of the appended claims, some important features are described here. Details of one or more implementations of the matter described in this specification are set forth in the accompanying drawings and in the description below. Other features, aspects, and advantages will become apparent from the description, drawings, and claims. Note that the relative dimensions of the following figures cannot be used for scaling.
One aspect of the matter described in the disclosure provides an implementation of a method implemented in a wireless communication apparatus. The method includes receiving an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus with respect to a user of the wireless communication apparatus. The method further includes determining a transmission power characteristic based on at least one mode of operation and at least one of a type of radio access technology, a band class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof. Another aspect of matter described in the disclosure provides a wireless communication apparatus. The device includes at least one transmitting antenna. The apparatus additionally includes a processor. The processor is configured to receive an indication of at least one mode of operation indicative of a proximity and orientation of a transmitting antenna to a user of the wireless communication apparatus. The processor is J further configured to determine a power transmission characteristic based on at least one mode of operation and at least one of a type of radio access technology, a band class, a transmission configuration, a channel of uplink, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.
Yet another aspect of matter described in the disclosure provides a wireless communication apparatus. The apparatus further includes means for receiving an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus with respect to a user of the wireless communication apparatus. The apparatus further includes means for determining a transmission power characteristic based on at least one mode of operation and at least one of a type of radio access technology, a band class, a transmission configuration, a loop channel. upward, a traffic state, and a transmission state of radio access technology used by the wireless communication apparatus, or any combination thereof.
Another aspect of matter described in the disclosure provides a computer program product. The computer program product includes a computer readable medium. The computer readable medium includes codes for receiving an indication of at least one mode of operation indicative of proximity and an orientation of at least one transmitting antenna of a wireless communication device with respect to a user of the wireless communication apparatus. The computer-readable medium further includes code for determining a power transmission characteristic based on the at least one mode of operation and at least one of a type of radio access technology, a band class, a transmission configuration, a uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.
Another aspect of the matter described in the disclosure provides an implementation of a method implemented in a wireless communication apparatus. The method includes receiving an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus with respect to a user of the wireless communication apparatus. The method further includes selecting a plurality of transformations related to the at least one mode of operation. The method further includes applying a selected transform to adjust a relationship between a transmit power level of a first transmitter and a transmit power level of a second transmitter. The method further includes determining a target transmit power level of the first transmitter based on the adjusted ratio and an actual transmit power level of the second transmitter.
Another aspect of matter described in the disclosure provides a wireless communication apparatus. The device includes at least one transmitting antenna. The apparatus additionally includes a first transmitter. The apparatus additionally includes a second transmitter. The apparatus additionally includes a processor. The processor is configured to receive an indication of at least one mode of operation indicative of a proximity and an orientation of the at least one transmitting antenna with respect to a user of the wireless communication apparatus.
The processor is further configured to select from a plurality of transformations related to the at least one mode of operation.
The processor is further configured to apply a selected transformation to adjust a relationship between the transmit power level of the first transmitter and a transmit power level of the second transmitter.
The processor is further configured to determine a target transmit power level of the first transmitter based on the set ratio and a current transmit power level of the second transmitter.
Yet another aspect of matter described in the disclosure provides a wireless communication apparatus.
The apparatus includes means for receiving an indication of at least one mode of operation indicative of proximity and an orientation of the at least one transmitting antenna of the wireless communication apparatus with respect to a user of the wireless communication apparatus.
The apparatus further includes means for selecting from a plurality of transformations relating to the at least one mode of operation.
The apparatus further includes means for applying a transform selected to adjust a relationship between a transmit power level of a first transmitter and a transmit power level of a second transmitter.
The apparatus further includes means for determining a target transmit power level of the first transmitter based on the adjusted ratio and a current transmit power level of the second transmitter.
Another aspect of matter described in the disclosure provides a computer program product.
The computer program product includes a computer readable medium. The computer readable medium includes Codes for receiving an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of a wireless communication device with respect to a user of the wireless communication apparatus . The computer readable medium further includes code for selecting a plurality of transformations related to the at least one mode of operation. The computer readable medium further includes code to apply a transform selected to adjust a relationship between a transmit power level of a first transmitter and a transmit power level of a second transmitter. The computer readable medium further includes code for determining a target transmit power level of the first transmitter based on the adjusted ratio and a current transmit power level of the second transmitter.
Brief Description of Drawings Figure 1 shows an example of a simplified diagram of a wireless communication system. Figure 2 shows an example of a functional block diagram of an exemplary mobile device operating in a wireless communications network. Figure 3 shows an example of a functional block diagram of an exemplary access terminal shown in Figure 2.
Figures 4A-4B show examples of chip configurations for various radio access technologies incorporated into an access terminal.
Figure 5 shows a flowchart of an implementation of an exemplary method for determining transmission power levels based on a device state index.
Figure 6 shows an example illustrating the different groups of lookup tables for different types of radio access technology.
Figures 7A-7B show two exemplary aspect 5 of tables that can be used to determine a transmit power limit in accordance with a device state index. Figure 8 shows an example of a portion of a table for determining transmission power limits for a given type of radio access technology, a band class, a configuration, a transmission state, an uplink channel, a call type and a device mode.
Figure 9 shows a flowchart illustrating an implementation of an exemplary method for determining a transmit power limit in accordance with a provided device state index.
Figure 10 shows a flowchart illustrating an implementation of an exemplary method for filtering device state index values over a period of time. Figure 11 shows a flowchart illustrating an exemplary implementation of another method for filtering device state index values over a period of time. Figure 12 shows a flowchart illustrating an exemplary implementation of another method for filtering device state index values over a period of time.
Figure 13 shows a graph illustrating how a transmit power limit for lower priority data that can be transmitted using a second transmitter can be adjusted as a function of the level of !
transmit power for higher priority data which can be transmitted through a first transmitter. Fig. 14A shows an example of a lookup table that can be used to determine a transmit power limit for a second transmitter in accordance with the current transmit power level of a first transmitter.
Figure 14B shows a table illustrating how the lookup table of Figure 14A can be used to determine the transmit power limit for a second transmitter based on the current transmit power level of a first transmitter.
Fig. 15 shows an example of different lookup table groups for a type of radio access technology, which allows to dynamically determine a transmission power limit by a device state index to detect simultaneous transmission modes.
Figure 16 shows a graph similar to the graph shown in Figure 13 illustrating an example of transformations that can be applied to a standard transmit power limit curve. Figure 17A shows an example of a lookup table that defines a standard set of transmit power limits for data at a second transmitter in accordance with transmit power limits for data at a first transmitter, with the ability to adjust the default values according to a transformation.
Fig. 17B shows an example of a lookup table that can be used to determine the amount of bias to be applied at each device state index to the lookup table of Fig. 17A.
Fig. 18 shows an example of several groups of lookup tables for a type of radio access technology, which allows to dynamically determine a transmission power limit by a device state index for detecting simultaneous transmission modes.
Figure 19 shows a flowchart of an implementation of an exemplary method implemented by a wireless communication device.
Figure 20 shows a functional block diagram of an exemplary wireless communication apparatus. » Figure 21 shows a flowchart of an exemplary implementation of another method implemented by a wireless communication device.
Figure 22 shows another example of a functional block diagram of a wireless communication apparatus. Figure 23 shows an example of a functional block diagram of various components in a communications system.
In accordance with common practice the various features illustrated in the drawings cannot be used to scale. Therefore, the dimensions of the different features may be arbitrarily expanded or reduced for reasons of clarity. Also, some of the drawings may not represent all components of a given system, method or device. Finally, reference numbers can be used to denote similar features throughout the specification and figures. Detailed Description of the Invention Various aspects of implementations within the scope of the appended claims are described below. It should be evident that the aspects described herein can be implemented in a wide variety of ways, and that any structure and/or function described herein is merely illustrative. Based on the present description a person skilled in the art should appreciate that an aspect described herein may be implemented independently of any other aspect and that two or more of these aspects may be combined in various ways. For example, apparatus can be implemented and/or a method can be practiced using any number of the aspects set forth herein. Furthermore, such an apparatus may be implemented and/or such a method may be practiced using any other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.
the word "exemplary" is used herein to mean "to serve as an example, case or illustration". Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable one skilled in the art to make and use the invention. Details are given in the following description for explanation purposes.
It should be noted that one of ordinary skill in the art would understand that the invention can be practiced without the use of these specific details. In other cases, well-known structures and processes are not elaborated so as not to obscure the description of the invention in unnecessary detail. Thus, the present invention is not intended to be limited by the implementations shown, but is to be given the broadest scope consistent with the principles and features described herein. The techniques described here can be used for various wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access networks ( FDMA), Orthogonal FDMA networks (OFDMA), single-carrier FDMA networks (SC-FDMA), etc. The terms "networks" and "systems" are often used interchangeably. The CDMA network can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes Broadband CDMA (W-CDMA) and Low Chip Rate (LCR).
CDMA2000 covers IS-2000, IS-95 and IS-856 standards. The TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM", etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS) Long Term Evolution (LTE) is a launch of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and lte are described in documents from an organization called "3rd Generation Partnership project" (3 GPP CDMA2000 and EV-DO are described in documents from an organization called "3rd Generation Partnership project 2" (3GPP2) These various radio technologies and standards are known in the art.
The techniques described herein can further be used COR1 in various modes associated with different radio access technologies, such as simultaneous voice and data modes that allow simultaneously sending and receiving voice and non-voice data. For example, simultaneous EV-DO and lX Voice (SVDO) and simultaneous lx and LTE (SVLTE) data modes.
Single Carrier Frequency Division Multiple Access (SC-FDMA), which uses single carrier modulation and frequency domain equalization, is a technique used in a wireless communication system.
SC-FDMA has similar performance and essentially the same overall complexity as those of the OFDMA system. SC-FDMA signal has lower peak-to-average power ratio (PAPR) because of its inherent single-carrier 5 structure. SC-FDMA has attracted a lot of attention, particularly in uplink communications where lower PAPR greatly benefits the mobile terminal in terms of transmission power efficiency. Today it is a working hypothesis for the uplink multiple access scheme in Long Term Evolution 3GPP (LTE), or Evolved UTRA.
Figure 1 illustrates an exemplary wireless communication network 100. Wireless communication network 100 is configured to support communication between multiple users. Wireless communication network 100 can be divided into one or more cells 102, such as, for example, cells 102a-102g. Communication coverage in cells 102a-102g may be provided by one or more nodes 104 (e.g., base stations), such as, e.g., nodes 104a-104g. Each node 104 may provide communication coverage to a corresponding cell 102. Nodes 104 may interact with a plurality of access terminals (AT), such as, for example, ATS 1061a-1061. For ease of reference, ATs 106a-106l may be referred to as an access terminal 106. Each AT 106 may communicate with one or more nodes 104 on a forward link (FL) and/or a reverse link (RL) on a given time. FL is a communication link from a node to an AT. The RL is a communication link from an AT to a node. FL can also be referred to as the downlink. Furthermore, the RL can also be referred to as the uplink. Nodes 104 may be interconnected, for example, by appropriate wired or wireless interfaces and may be able to communicate with each other. Therefore, each AT 106 can communicate with another AT 106 through one or more nodes 104.
The wireless communication network 100 can provide 5 service over a large geographic region. For example, 102a-102g cells can span just a few blocks within a neighborhood or several square kilometers in a rural setting. In an implementation, each cell can be divided into one or more sectors (not shown).
As described above, a node 104 may provide an access terminal (AT) 106 within its coverage area with another communications network, such as, for example, the internet or other cellular network.
An at 106 can be a wireless communication device (eg, a cell phone, router, personal computer, server, etc.) used by a user to send and receive voice and data over a communications network. An access terminal (AT) may also be referred to herein as a user equipment (UE), with a mobile station (MS), or as a terminal device. As shown, ATS 106a, 106h, and 106j comprise routers.
ATS 106b-106g, 106i, 106k, and 1061 include cell phones. However, each ATS 106a-106l may comprise any suitable communication device.
An access terminal 106 may be multimode, capable of operating with different radio access technologies (RATs) such as standard defined radio access technologies such as CDMA2000 lx, Ix-EV-DO, LTE, eHRPD and the like. An access terminal 106 can perform a plurality of tasks in various communication systems using different radio access technologies. Communication can be accomplished using a plurality of co-located transmitters or can be communicated using a single transmitter. Figure 2 shows an example of a functional block diagram of an exemplary access terminal 106 in a wireless communication network.
200. Wireless communication network 200 comprises an access terminal 106, a second wireless communication device 210, a third wireless communication device 220, a fourth wireless communication device 230, and a cell tower 240. Wireless communication network 200 can be configured to support communication between a multitude of devices, such as wireless communication devices 106a, 210, 220, 230 and tower 240. Mobile wireless communication devices (e.g. , 106a, 210 and 220) may include, for example, personal computers, PDAs, music players, video players, multimedia players, televisions, electronic game systems, digital cameras, camcorders, watches, remote controls, headphones, and so on. Access terminal 106 may be simultaneously in communication with each of devices 210, 220, 230, and 240 through one or more transmitters co-installed on access terminal 106.
With continued reference to Fig. 2, the access terminal 106 can communicate with other wireless communication devices (eg, 210, 220) through a variety of communication channels. Communication channels can comprise ultra wideband (UWB) channels, Bluetooth channels, 802.11 channels (for example,
802.1la, 802.11b, 802.11g, 802.11n), infrared (IR) channels, ZigBee (802.15) channels, or a variety of other channels, as are well known in the art. In one implementation, the channel may be a UWB channel in compliance with ECMA-368. Other channels would be readily recognized as possible as well.
Wireless communications network 200 may comprise a wireless local area network (WLAN) covering a physical area, such as a home, office, or a group of buildings. WLAN may use standards such as the 802.11 5 standard (for example, 802.11g), and/or other wireless communication standards. WLAN can utilize peer-to-peer communication where wireless communication devices communicate directly with each other. Wireless communications network 200 may also comprise a personal wireless network (WPAN),' covering, for example, an area of a few meters.
WPAN may use standards such as infrared, Bluetooth, a Wi Media based UWB standard (eg ECMA-368), and ZigBee standards, and/or other wireless communication standards. WPAN can use peer-to-peer communication where wireless communication devices communicate directly with each other. The access terminal 106 can connect to another network, such as a wireless communications network or to the Internet, through the network.
200. Messages sent over wireless communications network 200 may comprise information relating to various types of communication (eg voice, data, multimedia services, etc.) and may be of varying degrees of importance to the terminal user access point 106, as described in more detail below.
Although the following implementations may refer to figure 1 or 2, it will be recognized that they are easily applicable to other communication standards. For example, an implementation can be applied to a UMTS communications system. Some implementations can be applied in an OFDMA communication system. Communication system 200 may further comprise any type of communication system, including, but not limited to, a split multiple access system.
17/.78 code (CDMA), a global system for mobile communications system (GSM), a broadband code division multiple access (WCDMA), and an OFDM system.
Figure 3 shows an example of a functional 5-block diagram of an exemplary access terminal 106 shown in Figure 2. The access terminal 106 may be multimode, capable of operating with different radio access technologies (RATS), such as any of the radio technologies mentioned above with reference to Figures 1 and 2. The access terminal 106 is an example of a device that can be configured to implement the various methods described herein. The access terminal 106 can implement any of the devices illustrated in Figures 1-2.
The access terminal 106 comprises a central data bus 317 that links several circuits together. The circuitry includes a controller/processor 320, a transceiver 330, a memory unit 308, and a rat circuitry 304 which may include various radio access technology modules such as modules 302a, 302b, 302C and 302d. Processor/controller 320 may comprise or be a component of a processing system implemented with one or more processors. The processor/controller 320 can be configured, or referred to as an application processor 320 in some implementations. The one or more processors can be implemented with any combination of general purpose microprocessors, microcontrollers, digital signal processors (DSPS), field programmable gate arrays (FPGAs), programmable logic devices (PLDS), controllers, state machines, closed logic, discrete hardware components, dedicated hardware, finite state machines, or any other suitable entities that can perform calculations or other manipulations of information. In some implementations, each RAT module 302a, 302b, 302C and 302d may have a separate antenna and or may have a 306a, 306b, 306C, and 5 306d controller that may also perform one or more functions as described with reference to the processor 320.
Transceiver 330 is connected to an antenna 336. If the access terminal 106 does not relay on any wireless links for data exchange, the antenna 336 may be dispensed with. In addition, the access terminal may use multiple antennas or any other combination of a number of transceivers or antennas.
Transceiver 330 includes a transmitter 332 and a receiver 334. Transceiver 330 processes and converts high frequency (HF) signals to baseband signals, and vice versa, via transmitter 332 and receiver 334.
Receiver 334 in turn processes back and buffers received signals before sending to data bus 317. Transmitter 332, in turn, processes and buffers data from data bus 317 before sending off the access terminal
106. For a single frequency access terminal 106, a transmitter 332 and a receiver 334 may be included in transceiver 330. Processor/controller 320 controls the proper timing, allocating time slices for data perception and processing for the different frequency bands for transceiver 330. Access terminal 106 may include multiple transceivers using one or multiple frequencies. For example, access terminal 106 may include a second transceiver 340 with a transmitter circuit 342 and a receiver circuit 344. Transmitter 340 may be connected to another antenna 346. In some implementations transceivers 330 and 340 may share an antenna 336 In one implementation, each transmitter 332 and 342 may transmit and receive information associated with a different radio access technology.
In addition, for simultaneous voice and data modes, one transmitter 332 can be used for voice data transmission, while another transmitter 342 can be used for non-voice data transmission. For example, a first transmitter 342 can be used to transmit and receive lx voice data, while a second transmitter 342 can be used for LTE only (DO) data.
Transceivers 330 and 340 and/or antennas 336 and 346 can be located in different locations of the access terminal.
106. Processor/controller 320 directs multiple transmitters 332 and 342 and receivers 334 and 344 to detect and/or process signals of different frequency bands.
It should be noted that the receiver part 330 may be implemented as an external circuit, such as an external modem, connectable to the access terminal 106.
In addition, the processor/controller 320 performs the data bus management function 317 and the general data processing function, including executing the instructional contents of the memory unit.
308. Memory unit 308 may include a set of modules and/or instructions. Instructions specific to the process steps of the access terminal 106 as shown and described in the implementations described below, may be encoded in various functions included in the contents of memory unit 308. In one implementation, memory unit 308 is a circuit. RAM (Random Access Memory). Some communication device functions, such as handoff functions, are software routines, modules and/or data sets. The memory unit 308 can be connected to another memory circuit (not shown), which can either be of the volatile or non-volatile type. As an alternative, memory unit 308 can be made up of other types of circuits, such as an EEPROM (Electrically Erasable Programmable Read Only Memory 5), an EPROM (Programmable Electrical Read Only Memory), a ROM (Read Only Memory ), an ASIC (Application Specific Integrated Circuit), a magnetic disk, an optical disk, and others well known in the art. Furthermore, the memory unit 308 may be a combination of an asic and memory circuitry of the volatile type and/or the non-volatile type.
Furthermore, the processor/controller 320 can be configured to communicate with and control the operation of the various modules configured for different radio access technologies (RATS). Each of the modules 302a, 302b, 302c and 302d can implement a specific radio access technology and can each individually include additional memory modules, communication components and functions that are applicable to the :> type of radio access technology implemented by the module. Each module 302a, 302b, 302C, and 302d may further include a controller 306a, 306b, 306c, and 306d which may each also be referred to as a 306a, 306b, 306c, and 306d modern processor that may be used to control the operation of Each RAT. For ease of reference, the 306a, 306b, 306c, and 306d controllers can be designated as a RAT 306 controller. In addition, the RAT 306a, 306b, 306C, and 306d controllers can be provided independently of each 302a, 302b module. , 302c and 302d to control the modules. In some implementations, the processor 320 can be configured to perform the functions of the RAT controller 306. In addition, . .
each of the RATs may include its own transceiver (S), including the antenna (S) (ion shown). RAT modules can implement any of the types of rat discussed above with reference to Figures 1-2. Antennas 5 336 and 346 may be located at different locations within access terminal 106. For example, antennas 336 and 346 may be at opposite (e.g., distal) ends or corners of access terminal 106 or adjacent to each other. , or antennas 336 and 346 may be on opposite sides of access terminal 106.
Access terminal 106 may further include a proximity sensor 350, which may be configured to detect a user's proximity to access terminal 106. Access terminal 106 may additionally include an orientation sensor .>360, such as as an accelerometer that can be configured to detect the orientation of the access terminal 106 relative to the user of the access terminal 106. In this specification and the appended claims, it should be clear that the term "circuit set" is understood to be a structural term and not as a functional term. For example, the circuitry can be an aggregate of circuit components, such as a plurality of integrated circuit components, in the form of processing and/or memory cells, modules, units, blocks, and the like, such as shown and described in Figure 3. Although they have been described separately, it should be appreciated that the functional blocks described with respect to access terminal 106 need not be separate structural elements. For example, the 320 processor, 308 memory, and 302a, 302b, 302C, and 302d RAT modules can all be incorporated on a single chip. The processor '.
t 320 may additionally or alternatively contain memory such as processor registers. Likewise, one or more of the functional blocks or portions of the functionality of several blocks can be incorporated on a single chip.
5 Alternatively, the functionality of a particular block can be implemented on two or more chips.
Figures 4A and 4B show two exemplary configurations for an access terminal 106, which implements various radio access technologies. Figure 4A shows an exemplary configuration for access terminal 106 showing different radio access technologies implemented on a single chip 402. Chip 402 includes a controller/processor 420. The chip additionally includes radio access technology modules 403a , 403b, 403c and 15 403d. Each of modules 403a, 403b, 403c and 403d may implement a different radio access technology such as those discussed above with reference to figures 1-2.
Figure 4B shows an exemplary configuration for the access terminal 106 showing different radio access technologies implemented on separate chips. A 402 chip can include a 420 controller/processor. Each radio access technology can be implemented on different 402a, 402b, 402c and 402d chips. The 420 processor/25 controller can control the operation of each of the 402a, 402b, 402c, and 402d chips. Each chip 402a, 402b, 402c and 402d may additionally include individual processors/controllers (not shown), memory modules (not shown), as well as other components 30 applicable to the implemented radio access technology. Wireless communication devices (eg, cellular mobile phones, personal data assistants, laptops, etc.) are generally subject to regulatory radio frequency (RF) safety requirements. These systems operate within specific guidelines before they can enter the market. For example, devices operating close to the human body are evaluated to determine the Specific Absorption Rate ("SAR") their electromagnetic waves produce. SAR is the time rate of electromagnetic energy absorption per unit mass in lossy media, and can be expressed as: s:4R(jr)" :::.::!E('7")|:"" (Equation 1) Where E(r) is the exogenous electric field at point r, while a(r) and p(r) is the corresponding equivalent of electrical conductivity and mass density, respectively. Generally, SAR tests assess the amount of energy absorbed by the body from such devices with a single or multiple transmitters. According to a requirement, devices operating at distances greater than 20 cm can be evaluated through a calculation or measurement of maximum allowable exposure ("MPE"),.
Fulfilling the SAR requirement can be challenging where a device may be required to support all active transmitters / antennas. In many existing devices, SAR compliance is achieved by determining a fixed maximum transmit power limit that cannot be exceeded during operation of the access terminal 106. When determining the transmit power limit, the features enable in an access terminal 106 and the mode of use may have to be taken into account. For example, the SAR experienced by a mobile phone user while the phone is held close to the head may be greater than otherwise due to the relative proximity of the transmitter and the user's body. In addition, an access terminal 106 temporarily configured as a mobile access point (access point) (for example, used to provide Internet access to a laptop via the wireless communication network of a cell phone) can increase transmissions. RF and thus increase the SAR suffered by a user when the access point is activated. In many existing devices, the maximum transmission power limit is fixed at a fixed value that considers for the access terminals 106 operating modes that have just been described. As such, the fixed value is always used to limit the maximum transmit power limit, regardless of whether, for example, the device is in close proximity to a user's body, or whether certain characteristics, such as points of access are currently enabled. In one aspect, this may result in limiting the transmission power level, even when it may not be necessary to achieve SAR compliance in accordance with the current operating mode 106a of the access terminal. As such, there is a need to adjust transmission power levels in order to provide flexibility given different modes of operation. A system, apparatus and method are provided to allow dynamic adjustment of a transmit power characteristic in accordance with the mode of operation of the device.
As such, some implementations described here are directed to selecting a transmit power limit based on the detected operating mode of an access terminal 106. As mentioned above, the operating mode may correspond to, for example, proximity to a user with the access terminal 106. A sensor of
"' " '_— ~ .
25/78 proximity 350 can be used to detect user proximity. When an access terminal 106 detects that the proximity sensor 350 is triggered/activated, a transmit power threshold value can be reduced in order to ensure compliance with SAR. Conversely, when access terminal 106 determines that proximity sensor 350 is no longer activated, the transmit power limit may be increased while the SAR of any electromagnetic radiation suffered by the user may be lower than otherwise.
Likewise, an operating mode can correspond to the detected orientation of a device. As the SAR can be higher or lower based on the exact position of the transmitter located within the access terminal 106 (for example, such as in the upper right corner of a cell phone) relative to the user's body, the orientation of the device can determine the current SAR. When an access terminal 106 detects a certain orientation (for example, using an orientation sensor 360), which corresponds to an orientation indicating that the transmitter is in close proximity to the user's body, a transmit power limit can be reduced. , in order to achieve SAR compliance. Conversely, when the access terminal 106 detects an orientation indicating that the transmitter is pointed away from the user's body, the transmit power limit can be increased while the SAR of any electromagnetic radiation suffered by the user can be less than the contrary.
As also mentioned above, a mode of operation may correspond to whether a certain communication feature of the access terminal 106, such as using the access terminal as a mobile access point, is activated. The activated mobile access point can increase the access terminal's baud rate and, consequently, increase the SAR of users in close proximity. When an access terminal 106 detects that a mobile access point is activated, a transmit power limit can be reduced (i.e., the access terminal 106 can back off the transmit power limit) in order to guarantee the compliance with SAR.
Conversely, when the access terminal detects that the mobile access point is no longer activated, the transmit power limit can be increased while the SAR of any electromagnetic radiation suffered by the user can be reduced.
Furthermore, any combination of the operating modes described above can impact that level of transmit power required to achieve SAR compliance. For example, an access terminal's mobile access point 106 can be activated simultaneously while the user is using the access terminal in a 20 call:phone and holding the phone to the ear
I of the user. In this scenario, the transmission power allowed to achieve SAR compliance can be adjusted to handle various combinations of possible modes of operation. Furthermore, the modes of operation described above are exemplary. Any other operating modes, which may affect the SAR experienced by the access terminal due to user transmissions 106 can be detected and used to adjust the transmit power limit according to the detected operating mode or any combination thereof. Other modes of operation will be known to a person skilled in the art.
(i :1 .ij : L
It should also be appreciated that transmission power levels can be dynamically adapted according to various criteria for purposes other than achieving SAR compliance in view of the various possible modes of operation. Implementations to dynamically change transmit power limits can be applied according to various operating modes for reasons unrelated to achieving SAR compliance. Furthermore, implementations for dynamically changing transmission power limitation can still be applied in situations not related to operating modes of the device, but rather to other situations where it may be desirable to adapt the transmission power characteristics.
An access terminal 106 can therefore be configured to adjust the transmit power limit in accordance with the different operating modes and any combinations thereof. This is in contrast to a fixed transmit power limit, which is limited by a worst-case mode of operation of the access terminal 106. Due to the variety of operating modes available, a variable number of transmission power limit adjustment can be done on the basis of each combination of operating modes. To provide 25 settings, in one implementation, an access terminal 106 provides a certain number of pre-configured transmission power limits corresponding to different modes of operation. The access terminal 106 may provide pre-configured transmission power limits for each radio access technology (RAT) performed by the access terminal 106 and further set transmission limits for other transmission characteristics of each RAT, as will be the case. further described below.
~~" g 28/78 Transmission power levels can be stored in lookup tables (LUTS) associated with various communication characteristics that can be indexed by a certain number of values corresponding to 5 different operating modes. Pre-configured transmit power may correspond to limits when operating in non-simultaneous data and voice (Non-SVD) mode. However, the implementations described here can still be adapted for use in simultaneous voice and data (SVD) mode. , as will be described below.
For example, a number of operating mode indices can be defined for an access terminal 106, where each index can be described as a device status index (DSI). Each DSI may correspond to some mode of operation or a combination of mode of operation detected by access terminal 106. An access terminal 106 may provide the DSI as an index to a LUT that specifies a transmit power limit to be used for that DSI.
Various transmit power limits can be determined for each DSI based on each RAT type, each RAT type band class, each RAT setting (eg modulation type), for certain RAT channels, etc. , as will be further described below. The LUT, indexed by the DSI, can be provided for each combination of the communication characteristics just described, where each LUT can specify the transmission power limits to be used corresponding to each DSI.
As such, a certain number of DSIS is provided. Another component, such as a processor 320, can determine which operating modes or combinations correspond to each DSI. In one aspect, this allows flexibility in determining choices of sensor states, mobile access point attributes, or other device attributes chosen for the DSI and used to determine pre-configured power limits.
Per
5 example, an original equipment manufacturer (OEM) who is developing a smart mobile phone or tablet computer can determine the hardware, sensors,
features and other device attributes that are supported by the device.
Each of the different design choices and the type or method of using the device can impact the SAR suffered by the user.
In one implementation, the OEM may configure the access terminal 106 and map operating modes with SAR implications to an applicable DSI in accordance with the characteristics of the access terminal 106. In operation, the processor 320 configured by the manufacturer may be configured to detect the desired operating mode and map the operating mode to an applicable DSI.
Once the desired DSI is chosen, an rf component, such as a controller component of RAT 306, may be able to use the DSI as an input to the LUTS for determining the appropriate power limit at which to operate.
DSI can be provided to all 306a, 306b, 306C and 306d RAT controllers (controlling different RATs or components of an RAT) that are configured to adjust the transmit power limits.
In one aspect, this provides flexibility in not requiring that dynamic transmit power levels be limited to a specific hardware device or operating modes, in order to allow a variety of devices with a variety of features to take advantage of the power limits of Flexible transmissions to ensure SAR compliance without sacrificing too much power transmission.
According to one implementation, while the DSI may be able to be selected by application level components, the transmit power limits stored in LUTS may not be configurable. For example, a processor 320 might be able to provide a DSI value from a RAT controller 306, but would not be able to provide any information about the specific desired transmit power levels. Each relevant 306 RAT controller then uses the DSI to determine the transmit power limit corresponding to the DSI. In one respect, this limits the opportunities for application-level components, or someone who is not well versed in RF, to set transmit power limits. In addition, if application-level components are allowed to dynamically change transmit power limits, the FCC may see the device as Software Defined Radio (SDR) and require certain device certifications for each software version. In another implementation, processor 320 may be able to provide some information about the specific desired transmit power level according to different modes of operation.
In this case, some implementations may provide protection against unsupported or inappropriate transmit power levels. Also, configuring different options to determine a device state index and mappings corresponding to operating modes can only be performed at compile time.
Figure 5 shows a flowchart of an implementation of an exemplary method 500 for determining transmit power levels based on a device state index in accordance with the application described above. At block 502, a device state index is received from a processor 320, or another controller. The number of DSIs available for the 320 processor can be pre-configured. In block 504, the transmit power levels corresponding to each RAt, band class of 5 RAT, RAT configuration and other communication parameters/characteristics are retrieved from LUTS according to the received DSI. DSI can be used an index directly into a LUT to retrieve a single transmit power value. In one aspect, transmit power levels can be expressed as signed, 16-bit integers with a least significant bit (LSB), representing 1/10 dBm. In block 506, the transmit power level is adjusted in accordance with the transmit power levels or limits predicted by the LUTS.
For each RAT, RAT band class, RAT configuration, etc., a standard transmit power table can be provided where applicable. This table can have a single element/value corresponding to a standard transmit power for the particular communication characteristic involved. In one implementation, application-level components may be unable to configure the default transmit power table. Furthermore, a predetermined DSI value, such as the zero value, can be chosen to correspond to the standard transmit power table. When a first access terminal 106 starts up, the DSI can be initialized to zero and defaults to the transmit power levels defined by the standard transmit power table. In addition, the default transmit power table can be configured to be used any time the system access transmit state is being used. If a received DSI value is outside the pre-number range.
configured DSIS, the default DSI value of zero can be used which matches the values in the default configured transmit power table.
As mentioned above, transmission power levels for a variety of communication parameters / characteristics (eg RAT type, band class, modulation type, uplink channel, etc.) can be specified accordingly. with the selected DSI value. According to an implementation, each combination of parameters can correspond to a transmit power level and, therefore, a LUT indexed by the DSI can be provided for each combination.
Figure 6 shows a list of different t groups of LUTS for different types of rat to provide an example 15 of different possible transmission power levels provided by DSI. In Fig. 6, at 602, a device state index is provided for LUTs for each RAT. In block 620, the group of LUTS 604 corresponds to transmit power levels associated with a first RAT. A group of 20 LUTS per RAT band class is further provided as shown in blocks 606a and 606b. Furthermore, in the example shown in Fig. 6, the LUT is then provided for each uplink channel of each RAT band class, as shown in blocks 608a-608d. LUTS are provided for any number of types of RAT technology that an access terminal 106 can support. In block 630, the group of LUTs 610 corresponds to transmission power levels associated with RAT X. One group of LUTS per band class of RAT X is further provided as shown in blocks 612a and 612b. Furthermore, in the example shown in Fig. 6, the LUT is then provided for each uplink channel of each RAT band class, as shown in blocks 614a-614d. In addition, many other communication parameters / characteristics can be provided that correspond to LUTS. For example, other features may include a modulation type, a transmission state (e.g. traffic against system access), an uplink channel, a call type, or the like, as will be further described below. Furthermore, each RAT model can have more or less LUTS according to the specific attributes and characteristics for each type of RAT. Other communication characteristics / parameters may also have corresponding LUTS as can be determined by a person / person skilled in the art and which will be further described below.
Figures 7A-7B show two exemplary lookup tables 700a and 70Ob that can be used to determine a transmit power limit in accordance with a device state index. Figure 7A shows an example showing a LUT 700a corresponding to nine possible device state index values, each of which is associated with a different transmit power threshold. LUT 70Oa in Fig. 7A may correspond to a LUT 70Oa for a given RAT, band class, configuration, RAT transmission state, call type, and device mode. Each combination of a given RAT, band class, configuration, RAT transmit state, call type, device mode, or any other characteristic that affects transmit power, such as temperature, can correspond to a different LUT 70Oa with different values. Also, a DSI of zero can match the standard transmit power limit. As such, only DSIS 1-8 can be selected by a 320 processor. As shown in Figure 7A, the transmission power limits specified by each
DSI are decreasing in a linear manner as the DSI value increases. Fig. 7B provides another example of a LUT 70Ob unit corresponding to nine possible DSI values showing the various transmission power limits that can be specified according to the combination of communication parameters/features described above. LUTS 70Oa and 70Ob can allow flexibility in choosing the specific range and available transmit power limits according to the characteristics of each RAT and other device modes. Each of the LUTs 70Oa and 70Ob provided, or any of the LUTs described herein, can be stored in a memory module 308.
The LUTS 70Oa and 70Ob, or any of the LUTs described herein, may be stored in a memory module 308 located on a chip for each RAT, or may be located on a single chip configured to control the different types of RATs according to the configurations shown, for example, in figure 4.
According to an implementation, the LUT may be provided to determine the transmit power limits associated with each DSI in accordance with various communication characteristics / parameters for each type of RAT. Fig. 8 shows an example of a portion of a lookup table 800 for determining transmission power limits for a given type of radio access technology, a band class, a configuration, a transmission state, a channel. uplink, a call type, and a device mode. In addition, Figure 8 provides another example of possible combinations for different transmit power limit settings for each DSI. Each LUT 800 line in figure 8 corresponds to the different combinations of communication parameters / possible characteristics and indicates the transmission power limit for each DSI. Thus, the transmit power limits can be based on any combination of the speaker positions shown in figure 8.
Column 2 of LUT 800 in Figure 8 indicates RAT Type 5 as each RAT can be subject to various transmit power limits based on the design parameters associated with the RAT. The third column indicates a possible band class within each RAT. In the fourth column, the transmit power limit can be specified based on a RAT setting. This configuration can correspond, for example, to different types of modulation used within a band class, or other specific configurations of RAT transmission. In the next column, transmission power limits can be further based on the transmission status of the RAT. For example, the state can be either a traffic/connected state or a system access state. According to one implementation, adjustable transmit power limits can be ignored for the system access state and configured for the traffic state. If system access state is being used, then the DSI provided by the application level components can be ignored and the DSI can revert to zero (ie, the dsi associated with the default transmit limits). Once the access terminal 106 goes into the traffic state, the DSI specified by the application level components can be used to determine the transmit power limit. In column six, transmit power limits can be further determined per uplink channel. As an example, given the D and e uplink traffic channels, transmit power limit settings can be applied to the D uplink channel, but not to the E channel.
In the seventh column shown in LUT 800 of Figure 8, transmit power limits can still be based on a call type. For example, the type of call can be detected as a normal call or an emergency 911 call (E911) to an emergency operator. If the call is an E911 call, it may be desirable to have high transmit power to ensure that the call remains connected. In this situation, all transmit power limits can be ignored, and any SAR enforcement can be temporarily disregarded. In one implementation, if an E911 call is detected, the DSI provided by the application level components can be ignored and a DSI of zero can be used to indicate the default transmit power limits, or all transmit power limits. related to SAR compliance can be ignored completely. In another implementation, a specific DSI, such as a DSI value of one, may be reserved for a calling mode such as an E911 call. Thus, application level components can detect the E911 call and set the DSI value to the reserved value. The DSI index can then be provided to a table that can indicate a single transmit power limit for any combination of communication parameters/features available. Other call types (not shown) may also affect transmit power limits that are desirable for which other rows/columns of the table, shown in figure 8, or individual LUTS may be generated.
Also, as shown in the next column, transmit power limits can still be based on a device mode. For example, device mode can match callback mode
E911 in which an access terminal can receive a public safety answering point call, which is also known as a Public Safety Hotspot, after an E911 call. In this mode, it may be desirable to maintain high transmit power rates to ensure that an incoming call from emergency personnel is received. In this mode, all transmit power limits can be ignored, and any SAR enforcement can be temporarily disregarded. In one implementation, if the mode is enabled, the DSI provided can be ignored and a DSI of zero can be used to indicate the default transmit power limits, or all transmit power limits related to SAR compliance can be ignored. Other calling modes not described here can also affect the possibility of adjusting the transmit power limits, and for which corresponding lines or LUTS can be generated.
Thus, as shown in LUT 800 of Figure 8, lines 1-8 versus lines 10-13 illustrate the transmit power limits that correspond to different types of RAT. For each RAT type, lines 1-4 and 5-8 illustrate the transmit power limits associated with different bandwidth classes supported within the RAT type. Lines 11-13 illustrate transmission power limits that correspond to different configurations, such as different types of modulation supported by a given band class for a given type of RAT. Lines 1 and 2 illustrate the transmit power limits associated with different RAT type transmit states, such as system access versus traffic state. Lines 10 and 11 illustrate the transmit power limits associated with different uplink channels within a band class for the specified RAT type. Lines 2-4 illustrate the transmit power limits associated with call types as well as device modes such as normal calls versus 5 E9111 calls and device mode normal versus E911 callback (CB) modes. In an exemplary implementation, a DSI can be used to determine a column corresponding to all transmit power limits associated with each line (ie, the combination of communication parameters/characteristics). All values in that column can then be retrieved and provided to other processing components to adjust transmit power levels based on the new limits.
It should be understood that the LUT 800 shown in Figure 8 shows only a small portion of the possible combinations for the different transmit power limits for each DSI. Furthermore, another column providing additional communication parameters/features (and therefore other lines) of communication can also be provided in addition to the columns depicted in Figure 8, as will be appreciated by a person skilled in the art. Also, different RATs support different parameters/features. For example, one RAT may need to apply transmit power limits to modulation types within a band class, while another RAT may only support one modulation type. Thus, the lines shown in figure 8 can correspond to the various combinations of parameters / communication characteristics supported by each RAT. Furthermore, the LUT 800 shown in Figure 8 shows only a subset of several examples of transmit power limit values, which can be included in the table. Those cells shown in LUT 800 of Figure 8 that do not include a transmit power threshold value can be populated with suitable values if necessary. Furthermore, the transmission power limit values are shown merely illustrative of the various values that can be used according to the type of RAT, etc. The LUT 800 shown in Figure 8 can be stored in a 308' memory module and used to determine all applicable transmit power limits associated with the DSI at one time. Furthermore, as described above, each combination can be associated with individual LUTS, each of which is indexed by the DSI and the retrieved transmit power limit. As RATS have different different capabilities, one RAT may be associated with a different number of LUTS when compared to another RAT. Other logic components and/or circuitry can then be provided to determine how to adjust transmit power levels based on the transmit power limits retrieved from the single LUT 800 shown in Figure 8 or from the individual LUTs 70Oa and 70Ob shown in figures 7A-7B.
Under some implementations, > the OEM or other party may be able to provide tables with desired transmit power limit based on device operating modes. This can allow, for example, an OEM to have a table with the transmission power limits that correspond to a DSI. Allowing the tables to be provided by the manufacturer may result in the OEM trying to specify a transmit power limit that is greater than the transmit power limit supported by the RAT. Furthermore, different types of RATs can support different maximum transmit power limits. In one implementation, this is addressed by ensuring that the transmit limit remains equal to or less than the highest transmit power limit supported by the type of RAT.
In one aspect, this can be achieved by taking the minimum of what the RAT type allows and the transmission power limit specified by the LUT.
For example,
a RAT that supports CDMA2000 lx cannot allow transmissions of about 24 dBm.
In case a value of more than 24 dBrn is specified, the value should be ignored and a transmit power level of 24 dBm would be used instead.
Figure 9 shows a flowchart illustrating an implementation of an exemplary method 900 for determining a transmit power limit in accordance with a DSI provided to handle this situation.
At block 902, urrt new DSI is received.
This DSI can be associated with the transmit power limits set by a third party, or it can be associated with the pre-configured transmit power limits discussed above.
At block 904, the transmit power limit associated with the new DSI is determined using a LUT as described above.
In block 906, the determined transmit power limit is compared with the maximum transmit power limit supported or configured for a type of RAT.
If the determined transmit power limit is less than the highest transmit power limit supported by the RAT type, then in block 908, the determined transmit power limit is selected.
If the determined transmit power limit is greater than the highest transmit power limit supported by the RAT type, then in block 910, the high transmit power limit supported by the RAT type is selected and the limit of given transmission power is ignored.
The blocks described in figure 9 can be repeated for each type of RAT. A 320 processor or a 308 RAT controller can be configured to perform the functionality described in the blocks shown in Figure 9.
5 In some scenarios, the device's operating mode can change quickly. For example, if a user is continuously moving a cell phone, the proximity sensor 350 can be continuously activated/deactivated within a short period of time. In this situation, a processor 320 may be constantly providing a series of different DSI values for a short period of time. This can result in the device quickly adapting to the device's transmit power levels, which can lead to wasted processing and uneven transmit power levels. In one implementation, filtering DSI values over time is provided to filter out fast / unsustainable changes in DSI values received from a processor 320. Figures 10-12 show flowcharts illustrating various implementations of exemplary methods for filtering DSI values DSI to avoid. rapid / unsustainable operating mode changes (eg using hysteresis).
Figure 10 shows a flowchart illustrating an implementation of an exemplary method 1000 for filtering device state index values over a period of time. At block 1002, a processor 320 waits for a new DSI to be received from a processor 320. When a new DSI is received, the new DSI received is compared with the current DSI being used by each RAT in block 1004. new DSI and current DSI are the same, flow returns to block 1002 to wait for a new DSI that is different from the current DSI. If the new DSI is
G different from the current DSI, a timer is started as shown in block 1006. Flow continues to block 1008, where the countdown, while additionally waiting for any new dsi to be received from a 320 processor. DSI is received, while the timer continues to count down, flow returns to block 1004 where the new DSI is again compared with the current DSI currently used by each of the RATS, and the steps of blocks 1004 to 1008 are repeated. If the timer expires and no new DSI is received, then the new DSI can be used by all RATS types and the current DSI can be set as the new DSI in the block
1010. A processor 320 can then wait for a new DSI in block 1002 and the operations described by each of the 15 blocks are repeated. According to this implementation, a change to the DSI may not take effect until the change persists for more than a specified period of time. Otherwise, the change in DSI cannot be propagated to each RAT implemented by the access terminal 106. A 320 processor or a 308 RAT controller can be configured to perform the functionality described in the blocks shown in Figure 10.
According to a possible implementation, the transmit power limit cannot be higher (or non-decreasing) as the DSI value rises. As all LUTS can reference a common DSI, the transmit power limit can be decreased to increase DSI values for a multiple of different combinations of RAT communication characteristics described above. Like
In such, according to an implementation, the transmit power limits can be arranged in a trend. Thus, a transmit power limit change in one direction (eg, increasing or decreasing) can be aggressive (ie without using hysteresis time), whereas a transmit power limit change in the opposite direction can be conservative (that is, using the hysteresis time to ensure that
5 only the proper DSI changes are propagated). For example, if the transmit power limit needs to be lowered for SAR compliance, it may need to occur as quickly as possible.
However, when the transmit power limit is increased, care may need to be taken in such a way that only sustainable DSI changes are propagated.
Figure 11 shows a flowchart illustrating an implementation of an exemplary method 1100 for filtering device state index values over a period of time in accordance with the described implementation.
At block 1102, a processor 320 waits for a new DSI to be received from a processor 320. When a new DSI is received, the new DSI received is compared with the current DSI being used by each RAT, at block 1104. new DSI and current DSI are the same, flow returns to block 1102 to wait for a new DSI that is different from the current DSI.
If the new DSI is different from the current DSI, then for all LUTS, the transmit power limit for the new DSI is compared to the transmit power limit for the
Current DSI in block 1106. Whether the transmit power limit for the new DSI is less than or equal to the transmit power limit for the current DSI for all
LUTS then the new DSI is propagated to each RAT and the new DSI can be set as the current DSI in block 1108. This corresponds to a situation where it is not desirable to lower the transmit power limits to achieve SAR compliance as much as possible. as quickly as possible.
If the transmit power limit for the new DSI is not less than or equal to the transmit power limit for the current DSI for all LUTS, then a timer is started as shown in block 1110. Flow 5 then continues to block 1112 , where the timer is set to countdown, while additionally waiting for any new dsi to be received from a processor 320. If a new DSI is received while the timer is still counting down the flow returns to block 1104, where the new DSI is repurchased with the current DSI currently used by each RAT, and the steps of blocks 1104 to 1112 are repeated. If the timer expires and no new DSI is received, then the new DSI can be used by all RAT types and the current DSI can be set to the new DSI in the block
1108. Processor 320 may then wait again for a new DSI in block 1102 and the operations described by each of the blocks are repeated. The flow described starting at block 1110 corresponds to the situation where the transmit power limit is increased compared to the current transmit power limit and only sustainable changes in the DSI should be propagated. A processor 320 or a RAT controller 308 can be configured to perform the functionality described in the blocks shown in Fig. 11. The implementation described with reference to Fig. 11 can be adapted for the reverse situation. For example, according to another implementation, it may be desirable to immediately propagate changes in new DSI values when the transmit power limit increases, while exercising caution in propagating changes in new DSI values when the transmit power limit decreases. Consequently, the logic described in block 1106 can be reversed. In this situation, a new DSI would be immediately propagated to the RATs when the transmit power limit for the new DSI is greater than or equal to the transmit power limit for the current DSI for 5 all LUTS. And conversely, the timer would be set when the transmit power limit for the new DSI is less than the transmit power limit for the current DSI for all LUTS, such that only- sustainable DSI changes are propagated for RATS. According to another possible implementation, the transmit power limit corresponding to a DSI in one LUT can increase, while the transmit power limit corresponding to the same DSI in another LUT can decrease. In this situation, the flexibility of whether or not to rapidly propagate DSI changes may still be desirable. Thus, DSI change propagations can be configured for each LUT rather than for all RATS, as described with reference to Figure 11. As such, each LUT can have its own local "current DSI", as opposed to a DSI current "global" as shown with reference to Figure 11. In addition, each LUT may have its own local timer value (that is, the amount of hysteresis time) for use in determining .> whether to propagate a DSI change for the ULT.
Figure 12 shows a flowchart illustrating an implementation of an exemplary method for filtering device state index values over a period of time in accordance with the described implementation. The flowchart described in Figure 12 can be applied to each LUT. At block 1202, a RAT 308 controller waits for a new dsi to be received from a processor
320. When a new DSI is received, the new DSI is compared with the current DSI being used by each LUT in block 1204. If y L the new DSI and the current DSI for the LUT are equal, the flow returns to block 1202 to wait for a new DSI that is different from the current DSI for the LUT. If the new DSI is different from the current DSI for the LUT, the transmit power limit for the new DSI is compared to the transmit power limit for the current DSI for the LUT in the block
1206. If the transmit power limit for the new DSI is less than or equal to the transmit power limit for the current DSI of the LUT then the LUT can use the new DSI and the new DSI can be set as the current DSI of the LUT in block 1208. This corresponds to a situation where it is desirable to lower the transmit power limit for the LUT to ensure SAR compliance as quickly as possible.
15 If the transmit power limit for the new DSI is not less than or equal to the transmit power limit for the current DSI of the LUT, then a timer associated with the LUT is started as shown in block 1210.
Flow then continues to block 1212, where timer 20 is set to countdown, while additionally waiting for any new DSI to be received from a processor 320. If a new DSI is received while the timer is still counting down flow returns to block 1204, where the new DSI is 25 again compared to the current DSI currently used by the LUT, and the steps from blocks 1204 to 1212 are repeated. If the timer expires and no new DSI is received, then the LUT can use the new DSI and the LUT's current DSI can be set to the new DSI in block 1208. A 320 30 processor can then wait again for a new one DSI in block 1202 and the operations described by each of the blocks are repeated. The flow described starting at block 1210j corresponds to the situation where the power limit of {
transmission is increased compared to the current transmit power limit of the LUT and only sustainable changes in the DSI for the LUT can be propagated. Therefore, the operations described with reference to the 5 blocks in Fig. 12 can be repeated for each LUT. A 320 processor or a 308 RAT controller can be configured to perform the functionality described in the blocks shown in Figure 12.
The implementation described with reference to figure 12 can be adapted for the reverse situation. For example, according to another implementation, it may be desirable to immediately propagate changes in new DSI values for an individual LUT when the transmit power limit for LUT increases, while exercising caution in propagating changes in new DSI value for LUT when the transmit power limit decreases. Consequently, the logic described in block 1206 can be reversed. In this situation, a new DSI would be immediately propagated to the RATS when the transmit power limit for the new DSI is greater than or equal to the transmit power limit for the current DSI. And conversely, the timer will be set when the transmit power limit for the new DSI is less than the transmit power limit for the current DSI such that only sustainable DSI changes are utilized by the LUT. In many cases, when processor 320 provides a new DSI value, the new transmit power limit retrieved from each LUT may be different from the previous transmit power limit. However, in some LUTS the transmit power limit retrieved according to the updated DSI value may be the same as the transmit power limit already being applied. In an implementation, when a .-K controller
.r «" "+ 48/78
FV RAT 306 receives a new DSI value and determines whether to change a transmit power limit, the RAT 306 controller can compare the transmit power limit associated with the new DSI value with the associated transmit power limit 5 with the current DSI value. The 306 RAT controller can determine to change the transmit power limit only if the transmit power limit associated with the new DSI value and the transmit power limit of the current DSI value 10 are different. Otherwise, the RAT 306 controller cannot make any changes. In one aspect, this can allow for a reduction in processing required, for example, for bootstrapping procedures, when a change in the transmit power level is required.
15 According to some implementations, a power detector such as a high power detector (HDET) (which may be in one or more of the components in figure 3) can be used by the system in order to correct errors caused by the difference between a digital value for a transmit power level and the actual physical value to be transmitted. For example, a RAT might specify a transmit power limit of 24 dBm.
Once the transmit power level goes above a certain threshold, a power detector is activated, which measures the actual power being transmitted by an access terminal 106. The captured value is provided as a feedback to the access controller. RAT 306 so that the real value and digital value can be compared and the difference can be compensated. for example, while the digital transmission power limit may be set at 24 dBm, the actual transmission power level may only be 22 dBm. Therefore, the digital threshold can be increased to account for the error from 2dBm to 26 dBm of mode > ,j
5, . . . B.
49/78 that the actual transmission better reflects the desired threshold. However, the power detector can only be configured to be used to aid in detecting an error when the transmit power limit is above a certain threshold. The power detector can also be used in conjunction with the transmit power limit specified by the LUTs described above. In one implementation, if the transmit power limit from a LUT is within a range normally used or supported by the power detector associated with a RAT type, then the power detector can be activated and used to control and correct the transmission power level. On the other hand, if the transmit power limit from a LUT is not within range, then the power detector can be disabled. In addition to using a power detector to compensate for the difference between digital and actual values of transmit power levels, temperature compensation can also be performed to correct for true or digital differences. Temperature compensation is aimed at adjusting the digital gain representation of a transmit power level over different temperatures so that the actual transmit power level remains constant over different temperatures. In the case of devices with a single fixed transmit power limit to achieve SAR conformation as described above, a single table corresponding to temperature settings for one or more of a narrow range of transmit power limits is provided, based on the assumption that the transmission power limit is fairly static / constant.
However, in accordance with the implementations described herein, a variable number of transmit power limits are provided in accordance with each operating mode. In order to provide temperature compensation, an implementation provides for several tables that include temperature compensation setting values for a wide range of transmit power threshold values. For example, each table may contain a variable number of temperatures (and accompanying settings) that correspond to a narrow range of transmit power threshold values. Various tables covering a wide range of transmit power limit values can therefore provide temperature compensations over the specified possible transmit power limit values. In one implementation, the transmit power limit corresponding to a DSI value can be retrieved and then used by a temperature compensation table to determine the regulation of the transmit power limit according to temperature. In another implementation, temperature can be included as an additional column in the table described above with reference to Figure 8 such that the transmission power limit set for the temperature of each of the lines in Figure 8 can be retrieved using a measurement of current temperature. Furthermore, similar concepts regarding frequency compensation can also be provided.
Also, some RATs may not support an exact concept of a transmit power limit. For example, a RAT using the GERAN (GSM Edge Radio Access Network) standard may support the concept of a maximum power level rather than a transmit power limit. In this case, the transmit power limit can refer to the maximum power level. As described above, the power level obtained by the LUT can be limited in order not to exceed another maximum power level limit corresponding to the type of RAT.
5 In addition, some types of RAT may ration a transmit power limit on multiple carriers. According to an application, a transmit power threshold value retrieved by the LUT can represent the aggregate transmit power for all carriers. Transmit power 10 may be allocated between the carriers to satisfy the transmit power limit. Furthermore, for each RAT, additional operations can be performed in order to ensure that a certain transmit power limit is satisfied. In addition, it may be desirable to limit the use of the DSI to perform power threshold kickback in accordance with an operating mode to avoid invoking transmit power kickbacks during minimum performance tests.
Radio Access Technologies (RATs) can simultaneously support the transmission of signaling and data using multiple transmitters and/or antennas. For example, an access terminal 106 can be configured to use a simultaneous voice and data (eg SVDO or SVLTE) 3 mode, where a first transmitter 332 (or an antenna 336) can be used to transmit data. of voice (e.g., lx data such as VOz data) while a second transmitter 342 (or an antenna 346) may be used to transmit non-voice data (e.g., DO/EV-DO). As described above, Fig. 330 shows an example of a first transceiver 330 that includes a first transmitter 332 and a second transceiver 340 that includes a second transmitter 342. Although the following description describes transmissions in the context of two J,
transmitters 332 and 340, it should be noted that an access terminal 106 can perform simultaneous transmission of multiple types of data, with a single or multiple transmitters on separate or shared antennas. 5 To achieve SAR compliance, the combined contribution of transmissions from both 332 and 342 transmitters to specific absorption rate may need to be kept below regulatory limits. The orientation and location of each of the transmitters 332 and 342, along with any associated antennas 336 or 346 within the device can determine the effect of each of the transmitters and/or antenna on the specific absorption rate relative to the other transmitters or antennas.
In some configurations of access terminal 106, transmitters 332 e may be spatially located within access terminal 106 (e.g., on opposite sides of access terminal 106) such that simultaneous transmission does not increase the overall absorption rate. specific, compared to just when an antenna is transmitting. However, if transmitters 332 and 342 are located together within an access terminal 106, simultaneous transmission may increase the resulting overall specific absorption rate of the access terminal 106. In this case, the access terminal 106 may be configured to represent the transmit power levels of both transmitters 332 and 342 and limit the transmit power levels of each of the transmitters 332 and 342 based on the transmit power level of the other. Furthermore, if additional antennas or transmitters (not shown) are also included in access terminal 106 and which are in close proximity to transmitters 332 and 342, then the transmit power level of three or more transmitters /
antennas can be configured in such a way that the overall contribution to the specific absorption rate is within regulatory limits.
An access terminal 106 may therefore be configured to dynamically adjust transmit power limits for various transmitters or antennas in accordance with different modes of operation and any combinations thereof in a similar manner as described above. To provide the adjustments, in one implementation, an access terminal 106 may provide a predetermined number of preconfigured transmit power limits corresponding to various modes of operation for each of the transmitters 332 or 342. The transmit power levels for each type of transmission transmitted on various transmitters 332 and 342 can be stored in lookup tables (LUTS) associated with various communication characteristics which can be indexed by a device state index (DSI), ' corresponding to different operating modes, as will be further described below.
In one implementation, the transmit power limit for a second transmitter 342 (or an antenna 336) may depend on the transmit power level of a first transmitter 332 based on the priority of information to be sent by the transmitter. For example, a first transmitter 332 can be used for transmitting voice data (e.g., the lx data), while a second transmitter 342 can be used for transmitting non-voice data (e.g., data only (OD). ) EV-DO or DO/LTE). It can usefully ensure that the transmission power used to transmit voice data at the first transmitter 332 is not sacrificed for the transmission of non-voice data over a second transmitter 342. As such, one implementation provides for imposing transmission power limits on the second transmitter
342 based on the current transmit power level of the first transmitter 332. In this case, there may not be any
5 power limit setting (or setback) associated with the first transmitter 332 (e.g., the transmitter used to transmit the highest priority information). The transmit power limit for c) second transmitter 342 can be configured such that the SAR contribution of the second transmitter 342 at this limit is equal to the difference between the maximum SAR, or target SAR, allowed for the access terminal 106, and the current SAR contribution of the first transmitter 332 based on the current transmit power level of the first
15 transmitter 332. The total transmission power allowed to ensure SAR compliance may change according to different operating modes as described above.
As such, the access terminal 106 can be configured to dynamically adjust the power limit.
20 transmits to the second transmitter 342 based on either a sensed operating mode or a transmit power level of a first transmitter 332 sending the high priority information when both transmitters 332 and 342 are transmitting 25 simultaneously.
Figure 13 shows a graph 1300 illustrating how a transmit power limit for lower priority data (eg data only such as DO / LTE) that can be transmitted over a second
30 transmitter 342 can be adjusted depending on the transmit power level of the highest priority data (e.g., VOICE data) that can be transmitted through a first transmitter 332. 332 (represented by the x-axis 1304) increases the transmit power limit applied to the second transmitter 342 (represented by the y-axis 1306) decreases, as shown by the transmit power limit curve 1302. In this case, the transmit power stops the first transmitter 332 may be larger unless it is greater than the maximum transmit power level allowed by the RAT (indicated by 1308) or if it is transmitting power at a level 10 over its own limits above the SAR. The transmit power limit for the second transmitter 342 (or lower priority data) can be configured such that the SAR contribution of the second transmitter 342 at this limit is equal to the difference between the maximum SAR, or the 15 target SAR , allowed for the access terminal, and the current SAR contribution of the first transmitter 332 based on the current transmit power level of the first transmitter 332. Although the transmit power limit curve 1302 for the second transmitter 342 as a 20 The transmit power level function of the first transmitter 332 is shown as a step function in Fig. 13 according to implementations as will be further described below, implementations can also make use of various linear and non-linear functions 25 to adjust the threshold of transmit power to the second transmitter 342.
The different operating modes described above can adjust the sar and therefore the total transmission power available to be below the 30 regulation limits as described above. The access terminal 106 may be configured to dynamically adjust a function or a ratio that defines the transmit power limit i to be applied to the second l.
56,'78 transmitter 342 (for example, such as the function shown in figure 13) based on a current operating mode. For example, per device state index (dsi) described above, a different function defined to adjust the transmit power limit for a second transmitter 342 compared to the current transmit power level of a first transmitter 332 can be defined. Any type of linear or non-linear function can be used for each DSI. For example, if w1-Fi for 10 an access terminal 106 is enabled, or a proximity sensor 350 is triggered, the SAR may increase. if this
Yeah! is detected, then the function that sets the transmit power limits for a second transmitter 342 can be adjusted (e.g., corresponding to the transmit power limit curve 1302 moving downward) for each power level band of current broadcast l ! of a first transmitter 332 through a transformation. This can dynamically allow to consider {
F is the contribution of additional SAR according to the mode of operation, avoiding any power limit for the first transmitter 332. If the second transmitter 342'i at this transmit power level is at the minimum, the .] power level The transmission rate for the first transmitter 332 can also be limited according to the 25 operating conditions detected (eg, w1-Fi ! or access point), which raises or lowers the SAR. $ : According to an implementation, the lookup table (LUT) can be used to define the limits of
P is transmit power for data at a second transmitter 342 based on transmission power levels for data at a first transmitter 332. The values in the LUT may define a function/relation as shown in Figure 13. Figure 14A shows an example of
I an LUT 1400 that can be used to determine a transmit power limit for a second transmitter 342 based on the current transmit power level of a first transmitter 332. The first column of LUT 1400 5 provides various levels of transmit power to a first transmitter 332. The value choices for the first column may allow for controlling or limiting the transmit power level for the first transmitter 332.
The second column indicates a transmit power limit for a second transmitter 342 based on the transmit power level of the first transmitter.
332. In Fig. 14A, transmit power levels 332 for the first transmitter depicted in the first column may increase for each subsequent row. As the transmit power levels for the first transmitter 332 increase for each line, the transmit power limits for the second transmitter 342 shown in the second column may decrease for each subsequent line. Thus, as the transmit power level increases for the first transmitter 332, the transmit power limit for the second transmitter 342 decreases. To provide dynamic adjustment of transmit power levels based on operating conditions, a different LUT 1400 can be provided by any number of device state indices (DSI), where each DSI corresponds to a different operating condition or mode. or a combination of these. The LUT 1400 shown in Figure 14A shows five different transmit power levels for a first transmitter 332, however, any number of different transmit power levels can be used. The values in each row can be stored, for example, as signed, 16-bit integers with the least significant bit representing 1/10 dBm.
Figure 14B shows a table 1402 illustrating how LUT 1400 can be used to determine the transmit power limit for a second transmitter 342 based on the current transmit power level of a first transmitter 332. Transmit power for a first transmitter 332 may be sampled at different time intervals (e.g., for each power control group (GPC) or every 1.25 ms) and filtered to provide continuous measurements. In one implementation, a processor 320 is related to a first transmitter 332 (or processor 320 configured to process a class of data to be transmitted via a first transmitter) can perform sampling and measurements. This data may be transmitted to another processor 320 associated with second transmitter 342 (or a processor 320 configured to process a class of data to be transmitted via second transmitter 342). As such, an indication of a DSI can be sent to both processors. In other implementations, any combination of processor 320 or processors can be configured to perform sampling and to set transmit power limits for each of the transmitters and/or antenna. Each time, transmit power level is adjusted, the current transmit power level is compared with the transmit power levels defined in LUT 1400. If the transmit power level is below the first level on the first line shown in the figure 14A, a standard transmit power limit for the second transmitter 342 may be applied. If the current transmit power level for the first transmitter 332 is between the first and second levels, as defined by LUT 1402, then the associated transmit power threshold for the second transmitter 342 associated with the first power level 5 of transmission from the first transmitter 332 can be applied. Thereafter, if the current transmit power level for the first transmitter 332 lies between the second and third levels, as defined by LUT 1402, then the associated transmit power threshold for the second transmitter 342 is associated with the second transmission power level can be applied and so on.
The access terminal 106 may provide a different LUT 1400 for each DSI to allow for providing limits on transmit power levels for a second transmitter 342 according to different modes or conditions of operation. LUT 1400 for each DSI can be provided for each band class by RAT or additional features and combinations as described above. Figure 15 shows an example of several groups of LUTS for a type of RAT that allows dynamically determining a transmission power limit for a detected DSI for simultaneous transmission modes. At block 1502, a device state index (DSI) is provided to a RAT controller 306 to determine transmit power level thresholds. In block 1520, a group of LUTS 1504 is shown that defines the transmit power levels associated with a RAT. For example, a group of LUTS 1504 can be provided for both SVDO and SVLTE. A group of LUTs for each RAT band class is additionally provided as shown in blocks 1506a and 1506b. for example, a group of LUTs can be provided by at least two band classes for lx / EV-DO, by at least two band classes DO / EV-DO or LTE band classes. for each band class, different LUT 1508a, 1508b to 1508X and 1508c, 1508d to 1508z is provided as described in Fig. 14A for each DSI value. Based on the measurement transmit power level of the first transmitter 332, LUTs 1508a, 1508b and 1508c to 1508x, 1508d to 1508Z can provide a transmit power limit for a second transmitter 342 in accordance with the DSI. Although shown with the LUTS for each band class, the LUTS 1508a, 1508b and 1508C to 1508x, 1508d to 1508z can additionally be configured for different channel combinations of a band class or other subcombinations as described above, for example with reference to figure 6.
By providing a different LUT 1400 for each DSI per configuration per band class per RAT, etc., each different LUT 1400 can provide flexibility to define exactly how the transmit power limit for the second transmitter 342 is chosen based on the level of transmit power for the first transmitter 332. In other words, a different function describing the transmit power limit for the second transmitter 342 based on the transmit power level for the first transmitter 332 can be provided by each LUT. This allows for complex changes to the 1302 transmit power limit curve for each DSI. The memory requirements for storing each LUT 1400 for each DSI according to the combinations described above can be significant. Also, in some cases, provisioning each LUT can be time-consuming and complicated. Space / memory requirements cannot scale well if DSIS or RATS are added.
In another implementation, the number of LUTS 1400 can be reduced by providing a standard function or ratio to determine the transmit power limit for a second transmitter 342 based on the transmit power level of a first transmitter 332, along with the ability to apply transformations to the function for each mode of operation or a condition defined by a DSI.
Figure 16 shows a graph 1600 similar to the graph 1300 shown in Figure 13 which illustrates an example of transformations that can be applied to a standard transmit power limit curve 1602. In Figure 16, a standard transmit power limit curve , 1602 can be shifted up or down as shown by arrows 1610. Configure the access terminal 106 to adjust the transmit power limit curve 1602 (which represents how the transmit power limit for the second transmitter 342 is determined based on the transmit power level of the first transmitter 332) up or down allows the transmit power threshold value applied to the second transmitter 342 to be raised or lowered relative to all transmit power levels. of the first transmitter 332. An additional transformation shown by arrows 1608 allows a shift of the transmit power limit curve 1602 left or right. This transform allows you to adjust the transmit power levels of the first transmitter 332, which correspond to various limits on the transmit power of the second transmitter 342. Each DSI can use a different transform for left or right, up or down. In addition, other types of transformations can also be configured relative to the standard transmit power limit curve 1602. For example, a transformation could provide an angle that allows the transmission power limit curve 1602 to be rotated around a point. fixed to configure how best to determine the transmit power power limit for the 5 second transmitter 342 relative to the standard transmission.
According to one implementation, the lookup table (LUT) can be used to define the standard set of transmit power limits for data in a second transmitter 342 in accordance with the transmit power limits for data in a first transmitter 332 (for example, the default function described above). The values in the LUT can define a function as shown in Figure 16, which allows transformations along either the x or y axes. In other implementations a LUT may define transformations additional to a standard function/relationship. Fig. 17A shows an example of a lookup table (LUT) 1700 that defines a standard set of transmit power limits for data at a second transmitter 342 in accordance with transmit power limits for data at a first transmitter 332. with the possibility to adjust the default values according to a transformation. The LUT's first column 1700 provides various levels of transmit power for a first transmitter 332, as well as an additional bias input that corresponds to a DSI. The second column indicates a transmit power limit for a second transmitter 342 based on the transmit power level of the first transmitter 332 as well as an additional bias output that corresponds to a DSI. In Fig. 17A, transmit power levels for the first transmitter 332 shown in the first column may increase for each subsequent row. As the transmit power levels for the first transmitter 332 increase for each line, the transmit power limit for the second transmitter 342 shown in the second column may decrease for each subsequent line.
So, just like the power level of
5 transmit increases for the first transmitter 332, the transmit power limit for the second transmitter 342 decreases.
The polarization values to be applied to LUT 1700 can be obtained from another
LUT that can be indexed by a DSI.
Figure 17B shows an example of a LUT 1702 that can be used to determine the amount of bias that should be applied to each DSI for the LUT.
1700 of Figure 17A.
In Fig. 17B, each DSI is associated with an input bias corresponding to an amount to be added to the transmit power level of the first transmitter 332 shown in Fig.
17A and an output bias corresponding to an amount to be added to the transmit power limit of the second transmitter 342 shown in Figure
17A.
Polarization values can be positive or negative.
Furthermore, a DSI of zero corresponding to a standard operating mode can also be provided that does not provide additional bias.
When a new DSI is provided from processor 320, input and output biases can be determined from LUT 1702 in Fig. 17B and then applied to LUT 1700 in Fig. 17A.
The transmit power limit is then determined using a transmit power level measured by the first transmitter 332 as described above with reference to Figure 15B and further using the bias values to adjust the overall function defined by LUT 1700. As such, the LUT 1702 can define a transformation of a relation defined by a LUT 1700.
Thus, instead of having a separate LUT 1400 for each DSI, two LUTS 1700 and 1702 are provided to define a default function and bias values to transform the default function. This can allow you to provision less LUTS 5 per configuration / bandwidth class per RAT etc. Figure 18 shows an example of several groups of LUTS for a type of RAT that allow dynamically determining a transmission power limit by a DSI detected by simultaneous transmission modes. In contrast to Figure 15, for each band class, two LUTS 1708a and 1708b and 1708c and 1708d are provided for each band class.
Although shown as LUTs for each band class, LUTS 1708a and 1708b and 1708C and 1708d can be further configured for different combinations of channels of a band class or other subcombinations, as described above, for example with reference to figure 6. This it allows two LUTS per configuration for simultaneous transmission, compared to the LUT for each DSI, as described above with reference to Figure 14A and 15. In one aspect, this can allow for significant storage savings. Other advantages can also be foreseen.
Pseudocodes are provided below to illustrate how polarization values can be applied to a LUT 1700 to determine the transmit power limit. power limit Tx LTE related to SAR = P_PowerClass Target_LUTrownum = -1 For i = 0 to 4 if (filtered lx Tx power >= (1x_Txpower[i] + input_bias[DSI])) TargetLUT row num = if im — f im se (Target_LUT_row_num > -1)
SAR-related Tx LTE power limit is the sum of .... SAR-related Tx LTE power limit for LUT Row# = Target_LUT rownum PLUS outputbias[DSI] end Also, when multiple transmitters are used, multiple priority levels can be provided to determine the priority and thus which transmitter power level is adjusted based on the power level of the transmitter.
5 other transmitter.
For example, there may be priority layers associated with different RATS.
Each priority level can support multiple transmitter combinations.
(and bands) and transmit antenna 336 for a corresponding RAT.
For example, a first layer of priorities can be associated with a technology.
For example, there may be a transmitter associated with a first layer and a transmitter associated with a second layer.
In another implementation, there can be two transmitters at the first level and there are no transmitters associated with the second or third layer.
In another implementation, there can be one transmitter in a first layer and two transmitters in a second layer.
In another implementation, there may be a transmitter for each of the first, second, and third layers.
Other transformations as described above with reference to figures 13-18 can then be associated with different layers.
The operating mode can additionally determine the priority level.
As such, each transmitter 332 can be configured to report an average time Tx power.
Each transmitter 332 can be additionally configured to invoke / provision a
LUT to determine the transmit power limit for a transmitter coiti based on the transmitter's temporal average transmit power, which is / are superior in priorities. The table below shows example LUTS associated with each layer.
Transmitters in each layer LUT(s) of priorities I 1 in j layer, 1 in 2nd 1 input, 1 LUT output to j layer, 0 in :u layer I 2" layer |2 in j layer, 0 in 2nd !2 transmitters managed jlayer, 0 in 3rd layer jcollectively / together I 1 in j layer, 0 in 2nd I 1 input, 1 LUT output to jlayer, 1 in 3rd layer |2nd layer | 1 input, 1 LUT output to layer I 1 in jo layer, 2 in 2q I 1 input, 2 LUT outputs to jlayer, 0 in 3q layer |2nd layer |2 in jo layer, 1 in 2q I 2 inputs, 1 LUT output to jlayer, 0 in 3" layer I 2nd layer Table 1 As such, as described above, dynamic transmit power limit management can be provided for various types of RAT. For example, the implementations described here can be used in conjunction with a RAT type such as lx, DO, GSM (and EDGE / GPRS), WCDMA / UMTS (and HSPA / HSPA+), LTE (FDD and TDD), TD-SCDMA , WLAN, and the like. Furthermore, as described above with reference to Figures 14-18, the dynamic transmission power limit can be supported by a variety of simultaneous RAT transmissions. For example, simultaneous transmissions of lx + DO, lx + LTE, lx + WLAN, DO + WLAN, GSM + WLAN, WCDMA / UMTS WLAN +, LTE + WLAN, TD-SCDMA + WLAN, lx + DO + WLAN, lx + LTE + WLAN, GSM + LTE, GSM + LTE + WLAN, lx + GSM, DO + GSM, GSM + GSM, GSM + WCDMA / UMTS, GSM + TD-SCDMA, and how it can be supported.
As such, transformations and LUTS applicable for managing transmission power levels of one RAT based on transmission priorities for another RAT can be included for each of these combinations.
Figure 19 shows a flowchart of an implementation of an exemplary 1900 method implemented by a wireless communication device. Method 1900 can be implemented in an access terminal 106. Although method 1900 is described below with respect to the elements of access terminal 106, those of ordinary skill in the art will appreciate that other components can be used to implement one or more of the blocks described here.
In block 1902, an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna 336 of a wireless communication apparatus, such as an access terminal 106 is received. on a 320 processor. In another implementation, the indication may be received on a 306 RAT controller.
In block 1904, a power transmission characteristic is determined that is based on at least one mode of operation and at least one of a type of radio access technology, a band class, a transmission configuration, a loop channel. upward, a traffic state, and a state of radio access technology transmissions used by the wireless communication apparatus, or any combination thereof. The determination may be performed by a processor 320. In another implementation, the determination may be performed by a RAT controller 306. The power transmission characteristic may be a power limit, which specifies the maximum power that can be transmitted, or can be a maximum power level transmitted by the application.
Figure 20 shows a functional block diagram of an exemplary wireless communication apparatus.
2000. Apparatus 2000 comprises 2002 and 2004 means for the various actions discussed in relation to Figures 4-19. The various operations of methods described above can be performed by any suitable means capable of performing the operations, such as various hardware and/or software component (S), circuits and/or a module (S) · Generally, all operations illustrated in the figures can be carried out by corresponding functional means capable of carrying out the operations. "For example, the means for receiving an indication may include a processor 320 or a controller of RAT 306. The means for determining a transmit power characteristic may also include a processor 320 or controller of RAT 306.
Figure 21 shows a flowchart of an implementation of another exemplary method 2100 implemented by a wireless communication device. Method 2100 can be implemented in an access terminal 106. Although method 2100 is described below with respect to the elements of the access terminal 106, those of ordinary skill in the art will appreciate that other components can be used to implement one or more of the blocks described here. In block 2102, an indication of at least one mode of operation indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus, such as the access terminal 106 is received. processor 320. In another implementation, the indication may be received at a controller of RAT 306. In block 2104, one of a plurality of transforms is selected associated with the at least one mode of operation. Selection may further be performed by a processor 320 or RAT controller urrt 306. The transformation may be defined by a LUT 1702 as described above with reference to Fig. 17B. In block 2106, a selected transform can be applied .y to adjust the relationship between a transmit power level of a first transmitter 332 and a transmit power level of a second transmitter 334. The transform can further be applied by a processor 320 or a RAT controller 306. The relationship may be defined by a LUT 1700, for example, as described above with reference to Fig. 17A.
At block 2108 a target transmit power level of the first transmitter 332 may be determined based on the adjusted ratio and a current transmit power level of the second transmitter 342. The determination may further be performed by a processor 320 or a RAT controller 306. Figure 22 illustrates a functional block diagram of a wireless communication apparatus 2200. Device 2200 comprises means 2202, 2204, 2206 and 2208 for the various actions discussed in relation to Figures 4-21 that can send signals and communicate via a 2210 communication line (or bus). The various operations of methods described above can be performed by any suitable means capable of carrying out the operations, such as various hardware and/or software component(s), circuits and/or a module(s). Generally, all operations illustrated in the Figures can be performed by corresponding functional means capable of performing the operations.
For example, means for receiving an indication, means for selecting, means for applying, and means for determining can be performed via a processor 320 or a RAT controller 306. If implemented in software, functions can be stored or transmitted along. of one or more instructions or code in a computer-readable medium.
The steps of a process or algorithm described here can be implemented in a processor-executable software module that can reside on a computer-readable medium. Computer readable media includes both computer storage media and media 5 including any media that can be enabled to transfer a computer program from one place to another. Storage media can be all available media that can be accessed by a computer. By way of example, and not limitation, such computer readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures, and which can be accessed by a computer. Furthermore, any connection can be conveniently called a computer-readable medium. Disc and floppy disk, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray disc, where floppy disks generally reproduce data magnetically, whereas discs reproduce data optically with lasers. Combinations of the above should also be included in the scope of computer readable media. In addition, the operations of a method or algorithm can reside as one or any combination or set of codes and instructions on a machine-readable medium and a computer-readable medium, which can be incorporated into a computer program product.
In addition, as indicated by the systems and methods described above, the teachings in this document can be incorporated into a node (eg, a device) that employs various components to
:, 71/78 0,.
communicate with at least another node. Figure 23 depicts several sample components that can be used to facilitate communication between nodes. Specifically, Figure 23 is a simplified block diagram of a first wireless device 2310 (e.g., an access point) and a second wireless device 2350 (e.g., an access terminal) of a multi-entry system. and multiple output (MIMO) 2300. In the first device 2310, traffic data for a number of data streams 10 is provided from a data source 2312 to transmission data processor (TX) 2314.
In certain aspects, each data stream is transmitted through a respective transmit antenna.
Data processor tx 2314 formats, encodes and interleaves the traffic data for each data stream based on a special encoding scheme selected for that data stream to provide encoded data.
The encoded data for each data stream can be multiplexed with pilot data using 20 OFDM techniques. Pilot data is typically a known data pattern that is processed in a known manner and can be used in the receiving system to estimate channel response. The multiplexed pilot and coded data for each data stream is then modulated (i.e., symbol-mapped) based on a particular modulation scheme (e.g., BPSK, QSPK, M-PSK or M-QAM) selected for that data stream to provide modulation symbols. The data rate, encoding and modulation for each data stream can be determined by instructions 30 executed by a processor 2330. A data memory 2332 can store program code, data and other information used by the processor 2330 or other components of the device. 2310.
The modulation symbols for all data streams are then provided to a MIMO TX 2320 processor, which can further process the modulation symbols (e.g. for OFDM). The MIMO TX 2320 processor then provides Nt modulation symbol streams for Nt transceivers (XCVR) 2322A to 2322T. In some aspects, the MIMO TX 2320 processor applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
Each transceiver 2322 receives and processes its respective symbol stream to provide one or more analog signals, and further conditions (for example, amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the channel. PIM. Nt modulated signals from transceivers 2322A to 2322T are then transmitted from Nt antennas 2324A to 2324T, respectively. In the second device 2350, the transmitted modulated signals are received by Nr antennas 2352A to 2352R and the signal received from each antenna 2352 is provided to a respective receiver (XCVR) 2354A to 2354R. Each transceiver 2354 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol stream. A receive (RX) data processor 2360 then receives and processes the Nr received symbol streams from the Nr transceivers 2354 based on a special receiver processing technique to provide Nt "detected" symbol streams. RX data processor 2360 further demodulates, deinterleaves and decodes each detected symbol stream to retrieve traffic data for that data stream. The processing by the RX 2360 data processor is complementary to that performed by the MIMO TX 2320 processor and the TX 5 2314 data processor in the 2310 device.
A 2370 processor periodically determines which precoding matrix to use (discussed below). Processor 2370 formulates a reverse link message comprising an array index portion and a rank value portion. A data store 2372 may store program code, data and other information used by processor 2370 or other components of a second device 2350.
The reverse link message may comprise various types of information about the communication link and/or the received data stream. The reverse link message is then processed by a TX 2338 data processor, which also receives traffic data for a series of data streams from a 2336 data source, modulated by a 2380 modulator, conditioned by 2354A to 2354R transceivers , and transmitted back to device 2310. At device 2310, the modulated signals from second device 2350 are received by antenna 2324, conditioned by transceivers 2322, demodulated by a demodulator (DEMOD) 2340, and processed by a data processor RX 2342 to extract the reverse link message transmitted by the second device 2350. Processor 2330 then determines which precoding matrix to use to determine the beamforming weights, then processes the extracted message. Figure 23 also illustrates that communication components may include one or more components that perform access control operations as taught herein. For example, an access control component 2390 may cooperate with controller 2330 and/or other components of device 2310 to send/receive 5 signals to/from another device (e.g., device 2350), as taught herein. Likewise, an access control component 2392 may cooperate with processor 2370 and/or other components of device 2350 to send/receive signals to/from another device (e.g., device 2310). It should be noted that for each device 2310 and 2350 the functionality of two or more of the described components may be provided by a single component. For example, a single processing component may provide the functionality of the 2390 access control component and the 2330 processor, and a single processing component may provide the functionality of the 2392 access control component and the 2370 processor. of apparatus 2300 described with reference to Figure 3 may be incorporated with/in the components of Figure 23.
It should be understood that any reference to an element herein using a designation such as "first", "second" and so on generally does not limit the quantity or order of the elements. Rather, these designations can be used here as a convenient method of distinguishing between two or more elements or instances of an element. Thus, the reference to the first and second elements does not mean that only two elements can be employed or that the first element has to precede the second element in some way. In addition, unless otherwise noted, a set of elements may include one or more elements.
A person skilled in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, 5 commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination.
A person skilled in the art will also appreciate that any of the various illustrative blocks, logic modules, processors, media, circuits, and algorithm steps described in connection with the aspects described herein may be implemented as electronic hardware (e.g., an implementation digital, an > analog implementation, or a combination of the two, which can be designed using source code or some other technique), various forms of program or design code, including instructions (which may be referenced here for convenience, as "software", or a "software module), or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above, generally in terms of their functionality Whether such functionality is implemented as hardware or software depends on the particular application and design limitations imposed on the overall system. Expert experts may implement the described functionality in different ways for each particular application, but such implementation decisions should not be interpreted as a cause of departure from the scope of this disclosure.
The different illustrative logic blocks, modules, and circuits described in connection with the aspects
! g i 76/78 : j j 1 i [
l described here and in connection with figures 1-23 can be
implemented within or performed by an integrated circuit (IC), an access terminal, or an access point.
The IC may include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic,
discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute codes or instructions that reside within the IC, the IC wire, or both.
Logic blocks, modules and circuits can include antennas and/or
15 transceivers to communicate with various components within the network or inside the device.
A general purpose processor can be a microprocessor, but alternatively, the processor can be any conventional processor, controller, microcontroller, or state machine.
A processor can also be implemented as a combination of computing devices, for example a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in
25 set with a DSP core, or any other type of configuration.
The functionality of one of the modules can be implemented in any other mode as taught herein.
The functionality described here (for example, in relation to one or more of the attached figures) can
30 correspond in some respects to the "means to" functionality designated for similarity in the appended claims.
Any specific order or hierarchy of steps in any process described is understood to be an example of a sampling approach. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes can be changed while remaining within the scope of this disclosure. The Tracking Method claims elements present from the various steps in an exemplary order, and is not intended to be limited to the specific order or hierarchy presented.
Various modifications to the implementations described in this description may be readily apparent to those skilled in the art, and the general principles set forth herein may be applied to other implementations without departing from the spirit or scope of the present disclosure.
Thus, the description is not intended to be limited to the implementations shown here, but should be given the widest scope consistent with the claims, principles, and new features described herein. the word "exemplary" is used here exclusively to mean "serving as an example, case or illustration".
Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.
Some features that are described in this specification in the context of separate implementations can also be applied in combination in a single implementation. Conversely, multiple features that are described in the context of a single implementation can also be implemented in multiple implementations, separately or in any suitable subcombination. Furthermore, although features may be described above as acting in certain combinations and still initially claimed as such, one or more features of a claimed combination may in some cases be removed from the combination, and the claimed combination may be targeted to a subset or 5 variation of a subcombination.
Likewise, while the operations are depicted in the drawings in a particular way, this is not to be understood as requiring that those operations be performed in the particular order depicted or in sequential order, or that all illustrated operations be performed, to achieve desirable results . .J In certain circumstances, multitasking and parallel processing can be advantageous. Furthermore, the separation of the various system components in the implementations described above is not to be understood as requiring such separation in all implementations, and it is to be understood that the described program components and systems can generally be integrated into a single software product or bundled in various software products. Furthermore, other implementations are within the scope of the following claims. In some cases, the actions described in the claims may be carried out in a different order, and still achieve desirable results.

权利要求:
Claims (15)
[1]
1. Method (2100) implemented in a wireless communication apparatus, characterized in that it comprises: receiving (2102) an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus, wherein the indication includes operating mode indexes, wherein each operating mode index is described as a device status index, DSI, and wherein the DSI is provided as an index of a table seek, LUT, which specifies a transmit power limit to be used for the DSI; select (2104) from a plurality of transformations associated with at least one operating mode, in which the selected transformation is selected based on the LUT, and in which the selected transformation is selected based on priority layers, where one first transmitter is associated with a first priority layer and a second transmitter is associated with a second priority layer; applying (206) the selected transformation to adjust a relationship between a transmit power level of the first transmitter and a transmit power level of the second transmitter; and determining (2108) a target transmit power level of the first transmitter based on the adjusted ratio and a current transmit power level of the second transmitter.
[2]
2. Method (2100) according to claim 1, characterized in that the first transmitter and the second transmitter are configured to transmit simultaneously.
[3]
3. Method (2100) according to claim 1, characterized in that the relation is defined using at least one first lookup table, and in that the plurality of transformations is defined by at least one second lookup table .
[4]
4. Method (2100), according to claim 1, characterized in that the second transmitter is associated with a priority layer, and in which the selected transformation is selected based on the priority layer.
[5]
5. Method (2100) according to claim 1, characterized in that the second transmitter and a third transmitter are associated with a priority layer, and in which the selected transformation is selected based on the priority layer.
[6]
6. Method (2100) according to claim 1, characterized in that determining the target transmission power level further comprises determining the target transmission power level based on at least one of a type of access technology of radio, a band class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.
[7]
7. Method (2100) according to claim 6, characterized in that the type of radio access technology corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.
[8]
8. Wireless communication apparatus (2200), characterized in that it comprises: mechanisms (2202) for receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the communication apparatus. wireless communication, in which the indication includes operating mode indices, in which each operating mode index is described as a device status index, DSI, and in which the DSI is provided as an index of a lookup table , LUT, which specifies a transmit power limit to be used for the DSI; mechanisms (2204) for selecting from a plurality of transformations associated with the at least one mode of operation, in which the selected transformation is selected based on the LUT, and in which the selected transformation is selected based on priority layers, in that a first transmitter is associated with a first priority layer and a second transmitter is associated with a second priority layer; mechanisms (2206) for applying the selected transformation to adjust a relationship between a transmit power level of the first transmitter and a transmit power level of the second transmitter; and mechanisms (2208) for determining a target transmit power level of the first transmitter based on the adjusted ratio and a current transmit power level of the second transmitter.
[9]
9. Wireless communication apparatus (2200), according to claim 8, characterized in that the first transmitter and the second transmitter are configured to transmit simultaneously.
[10]
10. Wireless communication apparatus (2200) according to claim 8, characterized in that the relationship is defined using at least a first lookup table, and in which the plurality of transformations is defined by at least one second lookup table.
[11]
11. Wireless communication apparatus (2220) according to claim 8, characterized in that the second transmitter is associated with a priority layer, and in which the selected transformation is selected based on the priority layer.
[12]
12. Wireless communication apparatus (2220) according to claim 8, characterized in that the second transmitter and a third transmitter are associated with a priority layer, and in which the selected transformation is selected based on the layer of priority.
[13]
13. Wireless communication apparatus (2200) according to claim 8, characterized in that the mechanisms for determining the target transmission power level further comprise mechanisms for determining the target transmission power level on a per-pilot basis. at least one of a type of radio access technology, a band class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus. wire, or any combination thereof.
[14]
14. Wireless communication apparatus according to claim 13, characterized in that the type of radio access technology corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.
[15]
15. Computer program product characterized in that it comprises instructions that cause a computer to perform the method as defined in claims 1-8, when executed on the computer.

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优先权:

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申请号 | 申请日 | 专利标题

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US201161449512P| true| 2011-03-04|2011-03-04|

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US61/449,512|2011-03-04|

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US201161480191P| true| 2011-04-28|2011-04-28|

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US61/480,191|2011-04-28|

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US13/411,399|US8909282B2|2011-03-04|2012-03-02|Systems and methods for dynamic transmission power limit back-off for specific absorption rate compliance|

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US13/411,399|2012-03-02|

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PCT/US2012/027759|WO2012122116A1|2011-03-04|2012-03-05|Systems and methods for dynamic transmission power limit back-off for specific absorption rate compliance|

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