ue-rs extension for dwpts

专利摘要:
UE-RS EXTENSION FOR DWPTS Systems and methodologies are described that facilitate sending and / or receiving user equipment specific reference signal (UE-RSs) in a wireless communication environment. An UE-RS standard can be selected, supplied, etc. based on a symbol number from a subframe used for downlink transmission. At least one time domain component of the UE-RS standard can vary based on the number of symbols from the subframe used for downlink transmission. For example, the at least one time domain component can be drilled, shifted in time, and so on. Additionally UE-RSs can be mapped to resource elements of the subframe as a function of the UE-RS standard. Furthermore, an UE can use the UE-RS standard to detect UE-RSs in the resource elements of the subframe. Additionally, the UE can estimate a channel based on the UE-RSs.
公开号:BR112012002564B1
申请号:R112012002564-3
申请日:2010-08-04
公开日:2021-03-16
发明作者:Alexei Y. Gorokhov；Juan Montojo；Amir Farajidana；Kapil Bhattad；Brian Clarke Banister
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

Field of the Invention
[0001] The following description generally refers to wireless communications, and more particularly to the use of an EU-specific reference signal design (UE-RS) which is a function of a number of symbols used for link transmission downward in a wireless communication system. Description of the Prior Art
[0002] Wireless communication systems are widely used to provide various types of communication content, such as, for example, voice, data, and so on. Typical wireless communication systems can be multiple access systems capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth and transmission power). Examples of such multiple access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Division Multiple Access systems Orthogonal Frequency (OFDMA) and the like. In addition, systems may conform to specifications, such as Third Generation Partnership Project (3GPP), Long Term Evolution 3GPP (LTE), Ultra Mobile Broadband (UMB), Wireless multi-port specifications such as optimized data evolution (EV-DO), one or more of its revisions, etc.
[0003] In general, a multiple access wireless communication system can simultaneously support communication to multiple wireless terminals. Each terminal communicates with one or more base stations through transmissions on the forward and reverse links. The direct link (or downlink) refers to the communication link from the base stations to the UEs, and the reverse link (or uplink) refers to the communication link from the UEs to the base stations. Additionally, communications between UEs and base stations can be established through a single input and single output (SISO), multiple input and single output (MISO) or multiple input and multiple output (MIMO) system, and so on. In addition, UEs can communicate with other UEs (and / or base stations with other base stations) in point-to-point wireless network configurations.
[0004] To facilitate coherent demodulation and decoding of a transmission sent over a wireless channel, the channel estimate can be used. In one example, a channel response can be estimated by incorporating a known reference signal into the transmission. The reference signal can be analyzed by a receiver to facilitate estimating the channel response, which can approximate changes to the transmitted symbols due to channel conditions. Approximate changes can assist a receiver during symbol identification, demodulation, and decoding. Summary of the Invention
[0005] The following is a simplified summary of one or more modalities, in order to provide a basic understanding of such modalities. This summary is not a broad overview of all the modalities contemplated, and is intended neither to identify essential or critical elements of all modalities nor to outline the scope of any or all modalities. Its sole purpose is to present some concepts of one or more modalities in a simplified form as a prelude to the more detailed description that is presented later.
[0006] According to one or more modalities and their corresponding disclosure, several aspects are described in connection to facilitate the sending and / or reception of user equipment-specific reference signals (UE-RSS) in a wireless communication environment . An UE-RS standard can be selected, produced, etc. based on a number of symbols from a subframe used for downlink transmission. At least one time domain component of the UE-RS standard may vary according to the number of symbols from the subframe used for downlink transmission. For example, at least one component of the time domain can be punctured, shifted in time, and so on. In addition, UE-RSs can be mapped to resource elements of the subframe as a function of the UE-RS standard. In addition, the UE can use the UE-RS standard to detect UE-RS on the resource elements of the subframe. In addition, the UE can estimate a channel based on the UE-RSs.
[0007] According to related aspects, a method that facilitates the sending of reference signals for the estimation of the channel in a wireless communication environment is described here. The method may include identifying a number of symbols from a subframe used for downlink transmission. In addition, the method may include selecting a user equipment-specific reference signal pattern (UE-RS) based on the number of symbols from the subframe used for downlink transmission, where at least one domain component The length of the UE-RS standard varies depending on the number of symbols from the subframe used for downlink transmission. In addition, the method may include mapping UE-RSs to resource elements of the subframe as a function of the UE-RS standard.
[0008] Another aspect concerns a wireless communications device. The wireless communication device may include a memory that holds instructions for identifying a number of symbols from a subframe used for downlink transmission, selecting a user equipment-specific reference signal pattern (UE-RS ) based on the number of symbols from the subframe used for downlink transmission, where at least one time domain component of the UE-RS standard varies based on the number of symbols from the subframe used for transmission in downlink, and map UE-RSs to resource elements of the subframe as a function of the UE-RS standard. In addition, the wireless communication device may include a processor, along with memory, configured to execute instructions held in memory.
[0009] Yet another aspect refers to a wireless communication device that allows the sending of reference signals in a wireless communication environment. The wireless communication apparatus may include mechanisms for identifying a number of symbols from a subframe used for downlink transmission. In addition, the wireless communications device may include mechanisms for selecting a user equipment-specific reference signal standard (UE-RS) based on the number of symbols from the subframe used for downlink transmission, where at least one time domain component of the UE-RS standard varies based on the number of symbols from the subframe used for downlink transmission. In addition, the wireless communication device may include mechanisms for mapping UE-RSs to resource elements of the subframe as a function of the UE-RS standard.
[0010] Yet another aspect concerns a computer program product that can comprise a computer-readable medium. The computer-readable medium may include a code for identifying a number of symbols from a subframe used for downlink transmission. In addition, the computer-readable medium may include a code for selecting the user equipment-specific reference signal pattern (UE-RS) based on the number of symbols from the subframe used for downlink transmission, where at least one component of the time domain of the UE-RS standard varies based on the number of symbols from the subframe used for downlink transmission. In addition, the computer-readable medium may include code for mapping UE-RSs to resource elements of the subframe as a function of the UE-RS standard.
[0011] According to another aspect, a wireless communication device can include a processor, in which the processor can be configured to identify a number of symbols from a subframe used for downlink transmission. In addition, the processor can be configured to select a user equipment-specific reference signal standard (UE-RS) based on the number of symbols from the subframe used for downlink transmission, in which at least one component time domain of the UE-RS standard varies based on the number of symbols from the subframe used for downlink transmission. In addition, the processor can be configured to map UE-RSs to resource elements of the subframe as a function of the UE-RS standard.
[0012] According to other aspects, a method that facilitates estimating a channel in a wireless communication environment is described here. The method may include identifying a number of symbols from a subframe assigned for downlink transmission. In addition, the method may include recognizing a user equipment-specific reference signal pattern (UE-RS) based on the number of subframe symbols assigned for downlink transmission, in which at least one time domain component the UE-RS standard varies depending on the number of symbols in the subframe assigned for downlink transmission. In addition, the method may include detecting UE-RSs in resource elements of the subframe specified by the UE-RS standard. The method may also include estimating a channel based on UE-RSs.
[0013] Another aspect concerns a wireless communications device. The wireless communication device may include a memory that holds instructions for identifying a number of symbols from a subframe assigned for downlink transmission, recognizing a user equipment-specific reference signal pattern (UE-RS ) based on the number of symbols from the subframe assigned for downlink transmission, where at least one time domain component of the UE-RS standard varies based on the number of symbols from the subframe assigned for transmission in downlink, detect UE-RSs in resource elements of the subframe specified by the UE-RS standard and estimate a channel based on the UE-RSs. In addition, the wireless communication device may include a processor, along with memory, configured to execute instructions held in memory.
[0014] Yet another aspect refers to a wireless communication device that allows estimating a channel in a wireless communication environment. The wireless communication apparatus may include mechanisms for identifying a number of symbols from a subframe assigned for downlink transmission. The wireless communications apparatus may also include mechanisms for recognizing a user equipment-specific reference signal pattern (UE-RS) based on the number of symbols from the subframe assigned for downlink transmission, where at least a time domain component of the UE-RS standard varies based on the number of symbols from the subframe assigned for downlink transmission. In addition, the wireless communications apparatus may include means for detecting UE-RS, in resource elements of the subframe specified by the UE-RS standard. In addition, the wireless communications device may include mechanisms for estimating a channel based on UE-RSs.
[0015] Yet another aspect concerns a computer program product that can comprise a computer-readable medium. The computer-readable medium may include a code for identifying a number of symbols from a subframe assigned for downlink transmission. In addition, the computer-readable medium may include code for the recognition of a user equipment-specific reference signal pattern (UE-RS) based on the number of subframe symbols assigned for downlink transmission, where at least at least one time domain component of the UE-RS standard varies based on the number of symbols from the subframe assigned for downlink transmission. In addition, the computer-readable medium may include a code for detecting UE-RSs in resource elements of the subframe specified by the UE-RS standard. The computer-readable medium may also include a code for estimating a channel based on UE-RSs.
[0016] According to another aspect, a wireless communication device can include a processor, in which the processor can be configured to identify a number of symbols from a subframe assigned for downlink transmission. In addition, the processor can be configured to recognize a user equipment-specific reference signal pattern (UE-RS) based on the number of symbols from the subframe assigned for downlink transmission, in which at least one component time domain of the UE-RS standard varies based on the number of subframe symbols assigned for downlink transmission. In addition, the processor can be configured to detect UE-RSs in resource elements of the subframe specified by the UE-RS standard. The processor can also be configured to estimate a channel based on UE-RSs.
[0017] In order to achieve the related and related purposes, one or more modalities comprise the following characteristics, which are fully described and particularly pointed out in the claims. The following description and attached drawings set out here detail certain illustrative aspects of one or more modalities. These aspects are indicative, however, of just a few of the various ways in which the principles of various modalities can be employed and the modalities described are intended to include all of these aspects and their equivalents. Brief Description of the Figures
[0018] Figure 1 is an illustration of a wireless communication system, according to several aspects established here.
[0019] Figure 2 is an illustration of an exemplary wireless network, which employs UE-RSs to facilitate downlink channel estimation according to several aspects.
[0020] Figure 3 is an illustration of an exemplary system that maps UE-RSs to REs in a subframe in a wireless communication environment.
[0021] Figure 4 is an illustration of an exemplary subframe that can be used in a wireless communication environment.
[0022] Figure 5 is an illustration of an example of an EU-RS standard shifted in time, according to several aspects.
[0023] Figure 6 is an illustration of a standard EU-RS example punctured according to several aspects.
[0024] Figure 7 is an illustration of an example of an EU-RS standard partially shifted in time according to various aspects.
[0025] Figure 8 is an illustration of an example of an EU-RS standard shifted in time, according to several aspects.
[0026] Figure 9 is an illustration of an exemplary subframe that can be used in a legacy wireless communication environment.
[0027] Figure 10 is an illustration of an exemplary methodology that facilitates the sending of reference signals for the estimation of the channel in a wireless communication environment.
[0028] Figure 11 is an illustration of an exemplary methodology, which makes it easy to estimate a channel in a wireless communication environment.
[0029] Figure 12 is an illustration of an exemplary system that allows the sending of reference signals in a wireless communication environment.
[0030] Figure 13 is an illustration of an exemplary system that allows estimating a channel in a wireless communication environment.
[0031] Figures 14 to 15 are illustrations of exemplary systems that can be used to implement different aspects of the functionality described here.
[0032] Figure 16 is an illustration of an exemplary wireless communication system that can be used in conjunction with the various systems and methods described here. Detailed Description of the Invention
[0033] Various aspects of the claimed matter are now described with reference to the drawings, in which similar reference numbers are used to refer to similar elements throughout the specification. In the following description, for the sake of explanation, numerous specific details are presented in order to provide a complete understanding of one or more aspects. It may be evident, however, that such aspects can be practiced without these specific details. In other examples, well-known structures and devices are shown in the form of a block diagram, in order to facilitate the description of one or more aspects.
[0034] As used in this application, the terms "component", "module", "system", and the like are intended to refer to a computer-related entity, both hardware, firmware, a combination of hardware and software, software , or running software. For example, a component can be, but is not limited to, a process running on a processor, a processor, an integrated circuit, an object, an executable, a sequence of execution, a program, and / or a computer. By way of illustration, both the application running on a computing device and the computing device can be a component. One or more components can reside within a process and / or sequence of execution and a component can be located on a computer and / or distributed between two or more computers. In addition, these components can run from various computer-readable media having several data structures stored therein. Components can communicate via local and / or remote processes, such as, according to a signal having one or more data packets (for example, data from a component that interacts with another component of a system local, distributed system, and / or over a network such as the Internet with other systems by means of the signal).
[0035] Various techniques described here can be used for various wireless communication systems, such as Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Division Multiple Access systems Frequency (FDMA), orthogonal FDMA systems (OFDMA), Single Carrier FDMA systems (SC-FDMA), etc. The terms "systems" and "networks" are often used interchangeably. A CDMA network can implement radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes broadband CDMA (W-CDMA) and other CDMA variants. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA system can implement radio technology, such as the Global System for Mobile Communications (GSM). An OFDMA system can implement radio technology, such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (Wi-Max), IEEE 802.20, Flash-OFDM ®, etc. UTRA, and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA that employs OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization called "3rd Generation Partnership Project" (3GPP). Additionally, CDMA2000 and UMB are described in documents from an organization called "3rd Generation Partnership Project 2" (3GPP2). In addition, such communication systems may additionally include ad hoc peer-to-peer network systems (eg, mobile to mobile) often using unpaired unlicensed spectra, 802.xx wireless LAN, BLUETOOTH and any other wireless communication technique. short or long track.
[0036] Multiple access by single carrier frequency division (SC-FDMA) uses single carrier modulation and frequency domain equalization. SC-FDMA has a similar performance and essentially the same global complexity as that of the OFDMA system. An SC-FDMA signal has a low peak / average power ratio (PAPR) due to its inherent single carrier structure. SC-FDMA can be used, for example, in uplink communications where lower PAPR benefits the UE a lot in terms of transmission power efficiency. Consequently SC-FDMA can be implemented as an uplink multiple access scheme in Long Term Evolution 3GPP (LTE) and Evolved UTRA.
[0037] In addition, several aspects are described here in connection with a user equipment (UE). The UE can refer to a device that provides voice and / or data connectivity. A UE can be connected to a computing device, such as a laptop or desktop computer, or it can be a standalone device, such as a personal digital assistant (PDA). The UE can also be called a system, subscriber unit, subscriber, mobile station, mobile, remote station, remote terminal, cellular, user terminal, terminal, wireless communication device, user agent, user device, or access terminal. The UE can be a cell phone, a cordless phone, a Session Protocol (SIP) phone, a wireless loop location station (WLL), a personal digital assistant (PDA), a portable device with wireless connection capability. computing devices, or other processing device connected to a wireless modem. In addition, several aspects are described here in connection with a base station. A base station can be used for communication with UEs and can also be referred to as an access point, node B, Evolved node B (eNóB, eNB) or some other terminology. A base station can refer to a device on an access network that communicates through the air interface, through one or more sectors, with UEs. The base station can act as a router between the wireless terminal and the rest of the access network, which can include an Internet Protocol (IP) network, by converting incoming air interface frames into IP packets. The base station can also coordinate the management of attributes for the air interface.
[0038] In addition, the term "or" is intended to mean an "or" inclusive instead of an "or" exclusive. That is, unless otherwise stated, or results from the context, the phrase "X uses A or B" is intended for any of the natural inclusive permutations. That is, the phrase "X employs A or B" is satisfied by any of the following cases: X employs A; X employs B, or X employs both A and B. In addition, the articles "a / o" and "one / a" as used in this application and the appended claims should generally be interpreted to mean "one or more" unless otherwise indicated otherwise or clearly from the context to be directed to a singular form.
[0039] In addition, several functions described in this document can be implemented in hardware, software, firmware, or any combination of these. If implemented in software, the functions can be stored in or transmitted through as one or more code instructions or by a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. The storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, storage on magnetic disks or other magnetic storage devices, or any other medium that may be used. used to transport or store the desired program code in the form of instructions or data structures and which can be accessed by a computer. In addition, any connection is properly called a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies, such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Floppy and disc, as used here, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray disc (BD), where floppy disks typically play data magnetically and discs play back data optically with lasers. The combinations of the above must also be included within the scope of computer-readable media.
[0040] Several aspects will be presented in terms of systems that can include a number of devices, components, modules, and the like. It should be understood and appreciated that the various systems may include additional devices, components, modules, etc., and / or one or more of the devices, components, modules, etc. discussed in relation to the figures do not need to be included. A combination of these approaches can also be used.
[0041] Referring now to fig. 1, a system 100 is illustrated according to several aspects presented here. System 100 comprises a base station 102 that can include multiple antenna groups. For example, an antenna group can include antennas 104 and 106, another group can comprise antennas 108 and 110, and an additional group can include antennas 112 and 114. Two antennas are illustrated for each antenna group, however, more or less fewer antennas can be used for each group. Base station 102 may additionally include a transmitter chain and a receiver chain, each of which, in turn, may comprise a plurality of components associated with signal transmission and reception (for example, processors, modulators, multiplexers, demodulators and demultiplexers, antennas, etc.), as should be appreciated by one skilled in the art.
[0042] Base station 102 can communicate with one or more user equipment (UEs), such as UE 116 and UE 122, however, it should be appreciated that base station 102 can communicate with substantially any number of similar UEs to UE 116 and UE 122. UE 116 and UE 122 can be, for example, cell phones, smartphones, laptops, portable communication devices, portable computing devices, satellite radios, global positioning systems, PDAs and / or any another suitable device for communication on system 100. As shown, UE 116 is in communication with antennas 112 and 114, in which antennas 112 and 114 transmit information to UE 116 through a direct link 118 and receive information from UE 116 via a reverse link 120. In addition, UE 122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to UE 122 via a direct link 124 and receive information from UE 122 behind through a reverse link 126. In a frequency division duplex (FDD) system, forward link 118 may use a different frequency band than that used by reverse link 120, and forward link 124 may employ a different frequency band than that used by reverse link 126, for example. In addition, in a time division duplex (TDD) system, forward link 118 and reverse link 120 may use a common frequency band and forward link 124 and reverse link 126 may use a common frequency band.
[0043] Each group of antennas and / or the area in which they are designated to communicate can be referred to as a base station sector 102. For example, antenna groups can be designed to communicate with UEs in a sector of the covered areas by base station 102. In communication over direct links 118 and 124, base station transmission antennas 102 may use beamforming to improve the signal / noise ratio of direct links 118 and 124 for UE 116 and UE 122. In addition, while base station 102 uses beam formation to transmit to UE 116 and UE 122 randomly dispersed through an associated cover, UEs in neighboring cells can be subjected to less interference, compared to a transmitting base station via a single antenna for all your UEs.
[0044] System 100 may employ EU-specific reference signals (UE-RSS) to facilitate the estimation of downlink channel. More particularly, base station 102 can identify a number of symbols from a subframe used for downlink transmission. The number of symbols in the subframe used for downlink transmission can vary, depending on whether the subframe is a regular subframe (for example, all symbols of the subframe are used for downlink transmission, ...), the subframe includes a Downlink Pilot Time Partition (DwPTS), the subframe is used in connection with downlink transmission for a retransmission with one or more symbols in the reserved subframe as interval symbols, or the like. For example, if the subframe includes a DwPTS, then the subframe can be a mixed subframe from a radio frame having a type 2 frame frame for TDD. Following this example, one or more symbols of the mixed subframe can be allocated for a guard period or a Uplink Pilot Time Partition (UpPTS) and, consequently, these one or more symbols of the mixed subframe are not used for DwPTS , and thus, are not used for downlink transmission. In addition, base station 102 can map UE-RSs to resource elements (RES) of the subframe as a function of an UE-RS standard corresponding to the number of symbols in the subframe used for downlink transmission.
[0045] For example, for a regular subframe, base station 102 can map UE-RS, for REs in the subframe based on a first UE-RS standard. In addition, when fewer symbols from a subframe are used for downlink transmission compared to a regular subframe (for example, at least one symbol from the subframe is not used for downlink transmission, ...), base station 102 can map UE-RSs to REs in the subframe based on a second UE-RS standard. The first UE-RS standard can include multiple frequency domain components and multiple time domain components. At least one of the multiple time domain components of the first UE-RS standard can be changed in the second UE-RS standard. For example, one of the multiple time domain components of the first UE-RS pattern can be shifted in time in the second UE-RS pattern. By way of another example, the multiple time domain components of the first UE-RS pattern can be shifted in time in the second UE-RS pattern. Following this example, the multiple time domain components of the first UE-RS standard can be shifted in time by a common number of symbols or by their different symbol numbers. According to another example, one of the multiple time domain components of the first UE-RS standard can be punctured in the second UE-RS standard. In addition, the second UE-RS standard can have the same frequency domain components as compared to the first UE-RS standard.
[0046] Now returning to fig. 2, an example of a wireless network 200 is illustrated, which employs UE-RSs to facilitate downlink channel estimation according to various aspects. Wireless network 200 includes wireless device 202 and wireless device 220 that communicate with each other over a wireless network. In one example, wireless device 202 and / or wireless device 220 may be an access point, such as a macro cell access point, or femto cell or peak cell access point, eNB, mobile base station , a part thereof, and / or substantially any device or apparatus that provides access to a wireless network. In another example, wireless device 202 and / or wireless device 220 may be a mobile device, such as a BS, a part of it, and / or substantially any device or device that receives access to a wireless network. thread.
[0047] Wireless device 202 may include multiple communication layers to facilitate data transmission / reception with wireless devices 220. For example, wireless device 202 may include a packet data convergence protocol module (PDCP ) 206 which can compress packet headers and facilitate encryption and protection of data integrity. Wireless device 202 may also include a radio link control module (RLC) 208 that performs segmentation / concatenation, retransmission manipulation, and sequence delivery to the upper layers, a media access control module (MAC) 210 which enacts logical channel multiplexing, hybrid automatic repeat request (HARQ) retransmissions, programming, and a physical layer module that manages 212 encoding / decoding, modulation / demodulation, and an antenna / feature mapping. Likewise, wireless device 220 can include a PDCP module 224, an RLC module 226, a MAC module 228, and a physical layer module 230 that provide the same or similar functionality.
[0048] According to an example, wireless device 202 can transmit an Internet Protocol (IP) packet 204 to wireless device 220 over a wireless channel. The wireless channel can be a downlink channel or an uplink channel. Upper layers (not shown) of wireless device 202 may generate the IP packet 204 or otherwise receive the IP packet 204 for transmission to one or more devices. The upper layers can include an application layer, an IP layer, and / or the like. The PDCP 206 module can receive IP packet 204 from upper layers and generate one or more PDCP service data units (SDUs). The PDCP 206 module can perform IP header compression on IP 204 packets. In addition, PDCP 206 module can encrypt IP packet 204 and / or provide integrity protection on IP 204 packets. The PDCP 206 module can also generate a data unit PDCP protocol (PDU) by combining a compressed and encrypted IP packet 204 (for example, a PDCP SDU) with a PDCP header that includes at least one SDCP PDU-related sequence number. The PDCP PDU can be provided for the RLC 208 module, which can segment and concatenate one or more PDCP PDUs into an RLC PDU, together with an RLC header. For example, based on a programming resource decision, a particular amount of data is chosen for transmission from an RLC buffer managed by the RLC 208 module, which segments and concatenates one or more PDCP PDUs to generate the RLC PDU .
[0049] The RLC 208 module provides the RLC PDU for the MAC 210 module, which provides MAC layer services (for example, multiplexing, HARQ retransmissions, programming, ...) for the RLC 208 module in the form of logical channels. A logical channel can be characterized based on the type of information carried. For example, the logical channels offered by the MAC 210 Module may include a transmission control channel (BCCH), which carries system information from a wireless network to mobile devices, an alert control channel (PCCH), used to alert mobile devices, a common control channel (CCCH), which carries control information, along with a dedicated random access control (DCCH) channel, which carries control information to and / or from devices mobile, a dedicated traffic channel (DTCH) used for user data to and / or from mobile devices, and a multicast control channel (MCCH) used to carry control information along with a multicast traffic channel ( MTCH), which supports the transmission of multimedia broadcasting multicast services.
[0050] The MAC 210 module can map logical channels to transport channels, which represent services provided by the physical layer module 212. The data about a transport channel are organized in transport blocks. For a given transmission time interval (TTI), one or more transport blocks are transmitted via a radio interface. In one example, the MAC 210 Module multiplexes RLC PDUs in one or more transport blocks.
[0051] The transport blocks can be provided for the physical layer module 212, which facilitates the encoding, modulation, multi-antenna processing and / or the mapping of a signal to physical frequency time resources (for example, REs,. ..). According to an example, physical layer module 212 can introduce a cyclic redundancy check (CRC) into a transport block to facilitate error detection. In addition, physical layer module 212 may include an encoding module that encodes 214 bits of the transport block. In one example, Turbo encoding may be employed by encoding module 214. Physical layer module 212 may include a modulation module 216 that modulates the encoded bits to generate symbols. Physical layer module 212 can use a mapping module 218 to configure antennas to provide different multi-antenna transmission schemes, such as transmission diversity, beam formation and / or spatial multiplexing. In addition, the mapping module 218 can map symbols to elements of physical resources, to allow transmission over the air.
[0052] Wireless device 202 can use one or more antenna 240 to transmit IP packet 204 to wireless device 220, which can receive transmission via antenna 250. While fig. 2 represents two antennas respectively associated with wireless device 202 and wireless device 220, it should be appreciated that wireless device 202 and wireless device 220 can include substantially any number of antennas. Upon receipt of the IP packets 204 from wireless device 202, the wireless device 220 may employ physical layer module 230 to decode and demodulate a transmission. For example, physical layer module 230 may include a mapping module 236 that maps REs to retrieve a set of symbols. Physical layer module 230 may also employ a demodulation module 234, which demodulates the set of symbols to retrieve a set of encoded bits. In addition, a decoding module 232 is included with physical layer module 230 to decode the set of encoded bits to generate a transport block. The transport block can be provided to the MAC 228 module to manage an HARQ retransmission, if necessary, due to errors (for example, decoding errors, transmission errors, ...) and to facilitate MAC demultiplexing to generate one or more more RLC PDUs. One or more RLC PDUs can be provided to the RLC 226 module for reassembly. For example, RLC PDUs may comprise one or more RLC SDUs and / or portions thereof. Thus, module RLC 226 reconstructs the RLC SDUs of the RLC PDUs. The grouped RLC SDUs can be processed by the PDCP 224 module, which decrypts and decompresses the RLC SDUs to retrieve one or more data packets, such as an IP 222 packet.
[0053] It should be appreciated that wireless device 220 may use similar functionality and / or similar modules as wireless device 202 to transmit a data packet to wireless device 202. In addition, wireless device 202 may employ similar modules and / or functionality described above with reference to wireless device 220 to receive a transmission from different devices, such as wireless device 220.
[0054] According to an example in which wireless device 202 sends IP packets 204 to wireless device 220, wireless device 220 can use an estimate of the downlink channel to facilitate coherent demodulation of a downlink channel physical device used to transmit IP packets 204. To enable channel estimation, wireless device 202 can include reference signals in a transmission to wireless device 220. In one example, wireless device 202 incorporates reference signals when transmission is an OFDM transmission. For example, wireless device 202 may employ physical layer module 212 and / or mapping module 218 to map reference signals to resource elements within the TTI corresponding to wireless transmission to device 220. In one aspect, The reference points can be cellular specific reference signals (SIR), which can be transmitted in many downlink subframes and can extend to a total downlink bandwidth. The reference signals can also be UE-RSS, which are transmitted in subframes and blocks of resources intended to receive a particular device or group of receiving devices.
[0055] Again, reference is made to the example where wireless device 202 transmits to wireless device 220. To allow wireless device 220 to generate a channel estimate for transmitting such, UE-RSs are incorporated and beam formation in a manner similar to that of data transmission. In one example, wireless device 202 can use physical layer module 212 to generate UE-RSs and mapping module 218 can insert UE-RSs into specific REs according to an UE-RS standard.
[0056] According to an example, an EU-RS standard can be divided between a pair of resource blocks (RBS) (for example, a group of REs, ...), included in a subframe. The pair of RBs can be provided as a frequency time grid having a duration of a subframe (for example, 1 ms, ...) and measuring 12 subcarriers. A subframe can include two partitions, each of six or seven symbols in length, depending on a cyclic prefix used. In this regard, a pair of RBs may comprise a 12x12 grid or a 12x14 grid of REs. It should be appreciated, however, that other definitions of RB can be provided and, in addition, the UE-RS standards described below can be used with varying definitions of RB.
[0057] In another aspect, the UE-RS standard employed for downlink transmission may be a function of a number of symbols from a subframe used for downlink transmission. According to an example, when a regular subframe is used for downlink transmission, a first UE-RS standard can be used. Following this example, the first UE-RS standard can be used when all symbols of a subframe are used for downlink transmission (for example, regular subframe, fourteen symbols of the subframe are used for downlink transmission when prefix is used normal cyclic, ...). By way of another example, when one or more symbols of a subframe are not used for downlink transmission, a second UE-RS standard can be used. According to this example, one or more symbols in the subframe are not used for downlink transmission when the subframe includes DwPTS. Alternatively, one or more symbols in the subframe are not used for downlink transmission when the subframe is used in connection with downlink transmission for a transmission with one or more symbols in the reserved subframe as interval symbols. For example, when using a normal cyclic prefix, the second UE-RS standard can be used when less than fourteen symbols of the subframe are used for downlink transmission.
[0058] The second UE-RS standard used for the subframe with at least one subset of symbols not used for downlink transmission may differ from the first UE-RS standard used for the regular subframe. For example, the second UE-RS standard can take into account a number of symbols configured for downlink transmission, however, it must be appreciated that the claimed matter is not so limited. According to the other example, the second UE-RS standard used when at least a subset of symbols in the subframe is not used for downlink transmission can be based on the first UE-RS standard used for the regular subframe. Following this example, the first UE-RS pattern used for the regular subframe can be shifted in time and / or perforated to obtain the second UE-RS pattern used for the subframe with at least a subset of symbols not used for transmission in downlink.
[0059] As additionally illustrated in the system 200, wireless device 202 may include a processor 217 and / or a memory 219, which can be used to implement some or all of the functionality of module PDCP 206, module RLC 208, module MAC 210, and module of the physical layer 212. Likewise, fig. 2 illustrates that the wireless device 220 can also include a processor 237 and / or a memory 239, which can be employed to implement some or all of the functionality of the PDCP 224 module, RLC 226 module, MAC 228 module, and layer module physical 230. In one example, memory 219 and / or 239 can hold a computer program product that makes use of UE-RSs as described herein.
[0060] Referring next to fig. 3, a system 300 is illustrated which maps UE-RS to REs in a subframe in a wireless communication environment. System 300 includes a base station 302 that can communicate with a UE 304. While base station 302 and UE 304 are shown in fig. 3, it should be appreciated that system 300 can include any number of base stations and / or UEs. According to one aspect, base station 302 can transmit information to UE 304 via a forward link or downlink channel and UE 304 can transmit information to base station 302 along a reverse link or uplink channel. It should be appreciated that the system 300 can operate on an OFDMA wireless network, a CDMA network, an LTE 3GPP or wireless LTE-A network, a CDMA20003GPP2 network, an EV-DO network, a WiMAX network, etc.
[0061] Base station 302 may comprise a programmer 306 that programs and allocates radio resources to one or more UEs, such as UE 304, to accommodate uplink and downlink transmissions. In one example, programmer 306 can assign one or more resource blocks to UE 304 for downlink transmission. The one or more resource blocks can be within the same subframe or located within disparate subframes.
[0062] Programmer 306 can allocate radio resources from various types of subframes to UE 304 for downlink transmission. For example, programmer 306 can assign radio resources from a regular subframe to the UE 304, thus, radio resources on all symbols from the regular subframe assigned to the UE 304 can be used for downlink transmission. According to another example, programmer 306 can assign radio resources from a subframe that includes DwPTS to the UE 304. Following this example, radio resources over a subset of symbols in the subframe that includes DwPTS can be used for transmission downlink, while radio resources over a remainder of the symbols in such a subframe are not used for downlink transmission (for example, it can instead be used for guard period or uplink transmission as part of an UpPTS, ...).
[0063] Although not shown, according to another example, it is also contemplated that system 300 may include a retransmission. On the downlink, base station 302 can transmit to the retransmitter, and the retransmitter can transmit the UE associated with the retransmitter. Likewise, on the uplink, the UE associated with the retransmitter can transmit to the retransmitter, the retransmitter can transmit to base station 302. Typically, a retransmitter may be unable to transmit and receive simultaneously (for example, during a common subframe) , ...). Thus, if base station 302 sends a packet on the downlink as part of a given subframe, the retransmitter can receive the packet sent by base station 302 (for example, after a delay, ...). Thereafter, the relay can transmit the packet to the UE associated with the relay on the downlink as part of a later subframe. Thus, the relay can hear the packet during a first subframe, and then can switch to transmitting the packet during a second subframe. However, switching from listening to the transmission can take time, and therefore a last one or two (or more) symbols from the first subframe can be reserved as interval symbols to support return transport channel relay connections ( backhaul). Therefore, programmer 306 can allocate radio resources from a subframe employed in connection with downlink transmission to the relay with one or more symbols in the reserved subframe as interval symbols, thus the radio resources over a subset of subframe symbols can be used for downlink transmission, while radio resources in one of the remaining subframe symbols can be reserved as interval symbols.
[0064] In addition, base station 302 can include a standard selection module 308 and a dedicated reference signal module 310. The dedicated reference signal module 310 can generate and insert an UE-RS into radio resources from of the subframe assigned by the programmer 306 for transmission to UE 304. The dedicated reference signal module 310 can generate an UE-RS and / or map UE-RS to one or more REs, according to an UE-RS standard chosen by the module standard selection 308.
[0065] The standard selection module 308 can select an UE-RS standard to be employed by the dedicated reference signal module 310. The standard selection module 308 can choose an EU-RS standard as a function of a number of symbols to from a subframe assigned for downlink transmission by programmer 306. For example, an UE-RS standard chosen by the standard selection module 308 for a subframe that includes DwPTS may be different from an UE-RS standard chosen by the standard selection module 308 for a regular subframe. DwPTS can cover only a fraction of a subframe, and downlink transmission can use symbols included in DwPTS. According to another example, the standard selection module 308 can take into account the number of subframe symbols configured for DwPTS (for example, as managed by programmer 306, ...). The following table shows the number of symbols comprising DwPTS in normal and extended cyclic prefix (CP) subframes (for example, for Version 8, ...) for different configurations (conf). It should be noted that for 3-symbol DwPTS there is no downlink Physical Shared Channel (PDSCH) transmission, and thus scenarios with more than 3 symbols for DwPTS can be addressed.

[0066] According to an illustration, the UE-RS standard chosen or generated by the standard selection module 308 for DwPTS can be based on an UE-RS standard for a regular subframe. Thus, the UE-RS standard for DwPTS can be obtained by the standard selection module 308 time shift and / or drilling from the UE-RS standard to a regular subframe.
[0067] For example, drilling the UE-RS standard for the regular subframe may refer to maintaining the time domain component (for example, belonging to the symbols, ...) of the UE-RS standard for the regular subframe that are part of DwPTS. In addition, time shifting from the UE-RS standard to the regular subframe can refer to shifting the time domain component from the UE-RS standard to the regular subframe in time by a given value (for example, the number of symbols , ...). According to an example, all the time domain components of the UE-RS standard to the regular subframe can be shifted in time by a certain value. According to an additional example, a subset of the time domain components from the UE-RS standard to the regular subframe can be time shifted by a given value, while the other time domain components from the EU-RS standard to the regular subframe can be non-shifted, shifted by disparate value, and so on. Thus, the standard selection module 308, for example, can obtain the UE-RS standard for the subframe which includes DwPTS by time shift and / or the perforation of the UE-RS standard for the regular subframe. A simple and regular structure of the above operations performed by the standard selection module 308 can be used to simplify the execution of system 300.
[0068] In addition, a maximum number of control symbols in DwPTS can be two. Thus, the standard selection module 308 can shift the UE-RS standard to the regular subframe, towards edges of the subframe that include the DwPTS when generating the subframe that includes the DwPTS. In addition, the standard selection module 308 can move the UE-RS standard to the regular subframe, depending on a number of configured control symbols. According to another illustration, a fixed UE-RS standard regardless of the number of control symbols configured in the regular subframe can be used by the standard selection module 308.
[0069] Drilling and time shifting operations performed by the standard selection module 308 can be applied to an EU-RS standard for RBS that have possible collisions with different signals and channels such as Primary Synchronization Signal (PSS), Physical Broadcast Channel (PBCH), Secondary Sync Signal (SSS), and the like. In addition, drilling and time shifting operations performed by the standard selection module 308 can be used to create an UE-RS standard for return transport channel relay connections where it may be desired to reserve one or two (or more) last symbols of a subframe as interval symbols. However, it must be appreciated that the claimed matter is not limited to the above.
[0070] Following the example in which the system 300 includes a relay, the relay can lose the last one or two (or more) symbols of a subframe, whenever those one or two (or more) symbols can be reserved as symbols of interval, when the relay switches from downlink reception from base station 302 to downlink transmission to the UE associated with the relay. Thus, in a regular subframe, where both the relay and UE 304 are programmed by base station 302 (for example, by programmer 306, ...), the standard selection module 308 can use a first UE-RS standard ( for example, regulating UE-RS Standard, ...) for UE 304 and a second UE-RS standard (for example, perforated displaced in time, ...) for the relay. Thus, the UE-RS standard can be chosen by the standard selection module 308 based on whether the downlink transmission is sent to a UE or a retransmission.
[0071] The radio resources of the subframe, with UE-RS, incorporated, can be transmitted to the UE 304. The UE 304 can include an assignment analysis module 312 that identifies one or more blocks of resources in one or more subframes which are allocated to UE 304. The 312 assignment analysis module can analyze control information included in a control channel, such as a downlink physical control channel (PDCCH), to identify one or more resource blocks. In addition, the assignment analysis module 312 can identify a number of symbols from a subframe used for downlink transmission to the UE 304.
[0072] Upon receipt of one or more resource blocks, UE 304 may employ a reference signal evaluation module 314 to extract UE-RSs from one or more resource blocks. In one example, the reference signal evaluation module 314 can identify UE-RSs inserted in one or more resource blocks through knowledge of the UE-RS standard employed by base station 302. UE-RSs can be provided to a module channel estimation 316, which generates a channel estimate to facilitate data demodulation, with one or more resource blocks associated with UE-RSS.
[0073] With reference to Figs. 4 to 8, UE-RS standards that can be used according to various aspects established here are illustrated. For the sake of simplicity of explanation, the UE-RS patterns are shown and described in the context of a pair of resource blocks, where each resource block comprises twelve subcarriers in the frequency domain and a partition with seven symbols in the time domain . It should be understood and appreciated that the EU-RS standards are not limited by the restrictions of the pairs of resource blocks represented, just as some pairs of resource blocks may, according to one or more modalities, include different dimensions (for example, a different number of subcarriers and / or different durations (number of symbols)). In addition, the block resource pairs shown and described here are indexed, in the frequency domain, by an index corresponding to each subcarrier. As shown in Figs. 4 to 8, subcarriers are indexed from 1 to 12 starting with a higher or higher frequency subcarrier. In addition, resource block pairs are indexed, in the time domain, by an index corresponding to each symbol (for example, OFDM symbol, ...) in a subframe from 1 to 14 starting with the beginning of the subframe. It should be appreciated that the structures are not limited to the indexing convention illustrated here, and other conventions may be employed. For example, those skilled in the art will understand and appreciate that pairs of resource blocks can be represented with other labeling conventions for resource blocks. In addition, it should be appreciated that the structures shown in Figs 4 to 8 are intended to encompass equivalent structures derived by displacing reference symbol locations in the time domain and / or in the frequency domain.
[0074] Returning to fig. 4, an example of subframe 400 is illustrated that can be used in a wireless communication environment. Subframe 400 can be used for normal cyclic prefix (CP). It should be appreciated that subframe 400 is provided as an example, and the subject matter claimed is not so limited.
[0075] Subframe 400 can have a duration of 1 ms, and can include two partitions (for example, each having a duration of 0.5 ms, ...). In the example shown, a subframe partition 400 may include seven symbols, in the case of normal CP length; thus, subframe 400 may include fourteen symbols. By way of another example, it is contemplated that a subframe (not shown), which employs extended CP can include two partitions, each of which can include six symbols. It should be appreciated, however, that the claimed material is not limited to the previous examples.
[0076] In the frequency domain, the resources of subframe 400 can be grouped in units of twelve subcarriers (for example, 180 kHz, ...). A unit of twelve subcarriers for a partition duration (for example, 0.5 ms, ...) can be referred to as a resource block (RB) (for example, an example is RB 402, ...). Subframe 400 includes a pair of RBs. The smallest resource unit can be referred to as a resource element (RE), which can be a subcarrier for a duration of a symbol (for example, 404 an example is included in RE RB 402, ...). A RB can include 84 REs for normal CP (or 72 REs for extended CP).
[0077] According to an example, subframe 400 can be a regular subframe. Following this example, even the first three subframe symbols 400 can be control symbols (for example, a first one, two, or three subframe symbols 400 can be control symbols and the remaining symbols can be used for the data,. ..). According to the other example, subframe 400 can be a subframe that includes DwPTS, hence, even a first two symbols of subframe 400 can be control symbols. It should be noted that UE-RSs are sent in a data portion of a subframe.
[0078] REs in subframe 400 can carry CRS and UE-RSS. For example, CRS (for example, an example is CRS 406, ...) can be mapped to REs on the first, second, fifth, eighth, ninth, and twelfth symbols of subframe 400. It should be appreciated, however, that the claimed matter is not limited to this example, as other CRS mappings are intended to fall within the scope of the appended claims of this specification.
[0079] In addition, UE-RSs can be mapped to REs according to an UE-RS standard as established herein. An EU-RS standard can be defined by several layers. Multiple layers within an UE-RS standard can be multiplexed using a combination of code division multiplexing (MDL) / frequency division multiplexing (FDM) and / or time division multiplexing (TDM). For example, an UE-RS standard can support up to two layers. Thus, an EU-RS standard can include several groups of CDMs, in which one group of CDMs is mapped over two contiguous REs in time (for example, an example is the CDM group 408, ...). Thus, two-layer pilots can be multiplexed orthogonally over the two contiguous REs in time. Each layer can be assigned a spreading sequence, and the UE-RS for each layer can be spread using its assigned spreading sequence over a set of REs shared by other layers. In addition, the assigned propagation sequence can be chosen to be orthogonal to minimize crosstalk.
[0080] FIG. 4 shows an EU-RS standard for a regular subframe. The EU-RS standard for a regular subframe includes frequency domain components and time domain components. A frequency domain component can refer to all CDM groups in the same subcarrier, hence the illustrated EU-RS standard for a regular subframe includes three frequency domain components (for example, three frequency searches, ... ). In addition, a time domain component can refer to all CDM groups with the same set of symbols. The UE-RS standard described for a regular subframe includes two time domain components (for example, two time searches, ...), where a time domain component includes three CDM groups in 6 and 7 symbols of subframe 400 and another component of the time domain includes three groups of CDM in 13 and 14 symbols of subframe 400. Consequently, the EU-RS standard for a regular subframe may include a total of six groups of CDM, which can mitigate an impact due to to changes in a channel in frequency and time.
[0081] Now referring to fig. 5, an example of an EU-RS time-shifted pattern is illustrated, according to several aspects. Fig. 5 shows an UE-RS 500 standard for a regular subframe and a 502 time-shifted UE-RS pattern. The 502 time-shifted EU-RS pattern can be used when a subframe includes a DwPTS, for example. Therefore, a downlink transmission is not sent on a subset of symbols from one end of a subframe, where the number of symbols included in the subset is a function of a DwPTS configuration. Much of the discussion below related to Figs. 5-8 follows this example, in which a subset of symbols is not used for downlink transmission due to the subframe including a DwPTS. However, it should be appreciated that at least a portion of the below can be extended to a subframe employed in connection with downlink transmission to a relay with one or more symbols in the subframe being reserved as interval symbols (for example, depending on a number of control symbols, ...).
[0082] Similar to the UE-RS standard from Fig. 4, the UE-RS 500 standard includes two time domain components, namely: time domain component 504 and time domain component 506. To provide UE-RS time-shifted pattern 502, time-domain component 504 and time-domain component 506 can be time-shifted by a common number of symbols. More particularly, the time domain component 504 and the time domain component 506 can be shifted every three symbols, resulting in time displacement of the UE-RS standard 502, with the time domain component 508 and the time component. time domain 510. The time domain component 508 includes three groups of CDM in symbols 3 and 4, and the time domain component 510 includes three groups of CDM in symbols 10 and 11.
[0083] According to an example, the 502 time-shifted UE-RS standard can be used when DwPTS includes eleven or twelve symbols, and thus the last two or three symbols (for example, symbols 12-14 or symbols 13- 14 ,. ..) are not used for downlink transmission. In addition, the 502 time-shifted UE-RS standard provides the same pilot spacing as compared to the UE-RS 500 standard since the UE-RS 500 standard is uniformly shifted in time. UE-RS standard shifted in time 502 can be used for a subframe that includes DwPTS since a maximum of two control symbols (for example, the first one or two symbols, ...) can be included in a control region, in compared to a regular subframe that can include a maximum of three control symbols (for example, a first one, two or three symbols, ...) in a control region. In addition, components in the frequency domain can remain unchanged between the UE-RS 500 standard and the 502 time-shifted EU-RS standard.
[0084] With reference to fig. 6, an example of a punched UE-RS standard is illustrated according to several aspects. Fig. 6 represents an UE-RS 600 pattern for a regular subframe and a perforated UE-RS pattern 602. As described here, the UE-RS 600 pattern includes two time domain components, namely: the domain component of time 604 and the time domain component 606. To obtain perforated UE-RS pattern 602, the time domain component 606 (for example, a second time domain component of perforated UE-RS pattern 602, .. .) can be perforated (for example, removed ...). Thus, the perforated UE-RS standard 602 may include time domain component 608, which includes three CDM groups in symbols 3 and 4, without the second time domain component. The perforated EU-RS 602 standard can be used when DwPTS includes nine, ten, eleven or twelve symbols and thus the last two, three, four or five symbols (for example, symbols 10-14, symbols 11-14, symbols 12-14 or symbols 13-14, ...) are not used for downlink transmission. In addition, components in the frequency domain can remain unchanged between the UE-RS 600 standard and the perforated UE-RS 602 standard.
[0085] Returning to fig. 7, an example of a partially time-shifted UE-RS pattern is illustrated according to several aspects. Fig. 7 shows a pattern of 700 UE-RS for a regular subframe and an EU-RS pattern partially time-shifted 702. As described here, the UE-RS 700 pattern includes two time domain components, namely: a the time domain component 704 and the time domain component 706. To produce UE-RS standard partially time-shifted 702, a portion of the UE-RS standard 700 can be time-shifted. In particular, the time domain component 706 can be shifted by three symbols, while not shifting in the time domain component 704. The precedent may result in EU-RS pattern partially time-shifted 702 with the time domain component 708 and the time domain component 710. The time domain component 708 includes three groups of CDM over symbols 6 and 7, and a time domain component 710 includes three groups of CDM over symbols 10 and 11. Thus, the spacing between the time domain component 704 and the time domain component 706 in UE-RS Standard 700 may differ in spacing between the time domain component 708 and the time domain component 710 in the EU-RS standard partially offset by time 702. The UE-RS standard partially shifted in time 702 can be used when DwPTS includes eleven or twelve symbols, and thus a last two or three symbols (for example, symbols 12-14 or symbols 13-14, ... ) are not used for downlink transmission. In addition, components in the frequency domain can remain unchanged between the UE-RS 700 standard and the UE-RS 7070 partially shifted standard.
[0086] For example, the EU-RS standard partially shifted in time 702 can be used for retransmitters. For a retransmission, even the first three symbols can be configured as control symbols. Therefore, the EU-RS standard partially shifted in time 702 can avoid the first three symbols. In addition, the EU-RS standard partially shifted in time 702 can avoid the last few (for example, one or two, ...) symbols, which the relay can use as an interval period.
[0087] With reference to fig. 8, an example of a time-shifted UE-RS pattern is illustrated according to several aspects. Fig. 8 shows an UE-RS 800 pattern for a regular subframe and an UE-RS time-shifted 802 pattern. As described here, the UE-RS 800 pattern includes two time domain components, namely: the time component time domain 804 and the time domain component 806. To provide the time-shifted EU-RS standard 802, the time domain component 804 and the time domain component 806 can be shifted in time by different numbers of symbols . For example, the time domain component 804 can be shifted by three symbols and a time domain component 806 can be shifted by seven symbols, resulting in the UE-RS standard shifted in 802 time with the time domain component 808 and a time domain component 810. The time domain component 808 includes three groups of CDM in symbols 3 and 4, and the time domain component 810 includes three groups of CDM in symbols 6 and 7. Thus, the spacing between the time domain component 804 and the time domain component 806 in the UE-RS standard 800 may differ in spacing between the time domain component 808 and the time domain component 810 in the EU-RS time-shifted 802 standard The 802-time-shifted EU-RS standard can be used when DwPTS includes nine, ten, eleven, or twelve symbols, and thus the last two, three, four, or five symbols (for example, 1014 symbols, 11-14 symbols, symbols or symbols 12-14 13-14, ...) are not emp watered for downlink transmission. In addition, components in the frequency domain can remain unchanged between the UE-RS 800 standard and the UE-RS time-shifted 802 standard.
[0088] Returning to fig. 9, an example of subframe 900 is illustrated that can be used in a legacy wireless communication environment. Subframe 900 can carry dedicated reference signals (DRSs) that can be mapped to REs according to a legacy DRS standard. The legacy DRS standard can be used in a Version 8 wireless communication environment, for example.
[0089] FIG. 9 is provided to highlight the differences between the drilling described here and drilling in the context of a legacy DRS standard. Due to the domain CDM groups of having been employed in the UE-RS standards described here (for example, the UE-RS standard set forth in Figs. 4-8, ...), for a subframe with thirteen symbols, the pilots (for example, UE-RSS, ...) in both symbols 13 and 14 can be removed (for example, perforated, ...), although the symbol 13 can still be used for downlink transmission. Thus, an entire group of CDM can be removed while drilling.
[0090] In contrast, the legacy DRS standard of subframe 900 can be used for the classification of a transmission (one layer). If subframe 900 is a DwPTS subframe, the legacy DRS standard can be perforated. For example, for a subframe with 10-12 symbols, the first three time searches can be maintained while puncturing the fourth time search. According to another example, for a subframe with 7-9 symbols, the first two time searches can be maintained while drilling the second two time searches. It should be appreciated, however, that the claimed material is not limited to the example established in connection with fig. 9.
[0091] With reference to Figs. 10-11, methodologies related to the use of UE-RSs, in a wireless communication environment are illustrated. While, for the sake of simplicity of explanation, the methodologies are shown and described as a series of acts, it must be understood and appreciated that the methodologies are not limited by the order of acts, just as some acts may, according to one or more modalities, occur in different orders and / or concurrently with other acts of those are shown and described here. For example, those skilled in the art will understand and appreciate that a methodology can alternatively be represented as a series of interrelated states or events, such as in a state diagram. In addition, not all of the illustrated acts may be necessary to implement a methodology according to one or more modalities.
[0092] With reference to fig. 10, a methodology 1000 is illustrated that facilitates the sending of reference signals for the estimation of the channel in a wireless communication environment. In 1002, a number of symbols from a subframe used for downlink transmission can be identified. For example, the number of symbols in the subframe used for downlink transmission can be identified from an assignment. As an example, if the subframe is recognized as a regular subframe, then all symbols in the subframe can be identified as being used for downlink transmission. According to the other example, if the subframe is recognized as including a Downlink Pilot Time Partition (DwPTS), then the number of symbols used for downlink transmission can be a number of symbols included in the DwPTS as configured . By way of an additional example, if the subframe is used to send the downlink transmission to a retransmitter, then one or more symbols in the subframe reserved as interval symbols can be identified.
[0093] In 1004, a user equipment-specific reference signal standard (UE-RS) can be selected based on the number of symbols from the subframe used for downlink transmission. For example, at least one time domain component of the UE-RS standard can be varied based on the number of symbols from the subframe used for downlink transmission. A time domain component of the UE-RS standard can include code division multiplexing (CDM) groups of the same set of symbols. In addition, the frequency domain components of the UE-RS standard can be unchanged based on the number of symbols from the subframe used for downlink transmission. In 1006, UE-RSs can be mapped to resource elements (RES) of the subframe as a function of the UE-RS standard.
[0094] According to an example, the at least one time domain component of the UE-RS standard can be varied based on the number of symbols from the subframe used for downlink transmission by displacement in at least a time domain component of the EU-RS standard. By way of illustration, a set of time domain components of the UE-RS standard can be shifted in time by a common number of symbols. According to another illustration, a set of time domain components of the UE-RS standard can be shifted in time by different, respective numbers of symbols. As yet another example, a time domain component of the UE-RS standard can be shifted in time, while a disparate time domain component of the UE-RS standard can be unchanged in time. By way of another example, the at least one time domain component of the UE-RS standard can be varied based on the number of subframe symbols used for downlink transmission by drilling a time domain component of the EU standard -LOL. According to the other example, the UE-RS standard can be selected based on whether the downlink transmission is sent to a retransmitter or an UE.
[0095] Returning to fig. 11, an 1100 methodology is illustrated, which facilitates the estimation of a channel in a wireless communication environment. In 1102, a number of symbols from a subframe assigned for downlink transmission can be identified. For example, if the subframe is recognized as being a regular subframe, then all symbols in the subframe can be identified as being assigned for downlink transmission. According to the other example, if the subframe is recognized as including a Downlink Pilot Time Partition (DwPTS), then the number of symbols assigned for downlink transmission may be a number of symbols included in the DwPTS as configured .
[0096] In 1104, a user equipment-specific reference signal pattern (UE-RS) can be recognized based on the number of symbols from the subframe assigned for downlink transmission. For example, at least one time domain component of the UE-RS standard can be varied based on the number of symbols from the subframe assigned for downlink transmission. A time domain component of the UE-RS standard can include code division multiplexing (CDM) groups of the same set of symbols. In addition, the frequency domain components of the UE-RS standard can be unchanged based on the number of symbols from the subframe used for downlink transmission. In 1106, UE-RSs in the resource elements (REs) of the subframe specified by the UE-RS standard can be detected. In 1108, a channel can be estimated based on the EU-RSs.
[0097] According to an example, the at least one time domain component of the UE-RS standard can be varied based on the number of symbols from the subframe used for downlink transmission by displacement in time of at least least a time domain component of the EU-RS standard. By way of illustration, a set of time domain components of the UE-RS standard can be shifted in time by a common number of symbols. According to another illustration, a set of time domain components of the UE-RS standard can be shifted in time by different, respective numbers of symbols. As yet another example, a time domain component of the UE-RS standard can be shifted in time, while a disparate time domain component of the UE-RS standard can be unchanged in time. By way of another example, the at least one time domain component of the UE-RS standard can be varied based on the number of subframe symbols used for downlink transmission by drilling a time domain component of the EU standard -LOL.
[0098] It will be appreciated that, according to one or more aspects described here, inferences can be made by sending and / or receiving UE-RSs in a wireless communication environment. As used herein, the term "infer" or "inference" generally refers to the process of reasoning about or inference states of the system, environment, and / or user of a set of observations as captured through events and / or data. Inference can be used to identify a specific context or action, or it can generate a probability distribution over states, for example. The inference can be probabilistic, that is, the calculation of a probability distribution on the states of interest based on the weighting of data and events. Inference can also refer to techniques used for the high-level composition of events from a set of events and / or data. Such inference results in the construction of new events or actions of a set of observed events and / or stored event data, whether or not the events are correlated in close temporal proximity, and whether the events and data come from one or more events and source data.
[0099] With reference to fig. 12, a system 1200 is illustrated, which allows the sending of reference signals in a wireless communication environment. For example, system 1200 may reside at least partially within a base station. It should be appreciated that the 1200 system is represented as including the functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or a combination of both (for example, firmware). System 1200 includes a logical grouping 1202 of electrical components that can act together. For example, logical array 1202 may include an electrical component for identifying a number of symbols from a subframe used for downlink transmission 1204. In addition, logical array 1202 may include an electrical component to select a pattern of user equipment specific reference signal (UE-RS) based on the number of symbols from the subframe used for downlink transmission, where at least one time domain component of the UE-RS standard varies according to the number of symbols from the subframe used for downlink transmission 1206. In addition, logical grouping 1202 may include an electrical component for mapping UE-RSs to resource elements (RES) of the subframe as a function of the EU- RS 1208. In addition, system 1200 may include a memory 1210 that retains instructions for performing functions associated with electrical components 1204, 1206, and 1208. Although presented as being external to memory 1210, it should be understood that one or more of the electrical components 1204, 1206, and 1208 may exist within memory 1210.
[00100] With reference to fig. 13, a 1300 system is illustrated that allows estimating a channel in a wireless communication environment. For example, the 1300 system can reside within an UE. It should be appreciated that the 1300 system is represented as including function blocks, which can be function blocks that represent functions implemented by a processor, software, or a combination of both (for example, firmware). The 1300 system includes a logical grouping 1302 of electrical components that can act together. For example, logical grouping 1302 may include an electrical component for identifying a number of symbols from a subframe assigned for downlink transmission 1304. In addition, logical grouping 1302 may include an electrical component for recognizing a User equipment-specific reference signal pattern (UE-RS) based on the number of symbols from the subframe assigned for downlink transmission, where at least one time domain component of the UE-RS standard varies based on in the number of symbols from the subframe assigned for downlink transmission 1306. In addition, logical grouping 1302 may include an electrical component for the detection of UE-RS, in resource elements (RES) of the subframe specified by the UE-RS standard 1308. In addition, logical grouping 1302 may include an electrical component to estimate a channel based on UE-RS, 1310. In addition, system 1300 may include go to a memory 1312 that retains instructions for performing functions associated with electrical components 1304, 1306, 1308, and 1310. While presented as being external to memory 1312, it should be understood that one or more of the electrical components 1304, 1306, 1308, and 1310 can exist within memory 1312.
[00101] Fig. 14 is an illustration of a 1400 system that can be used to implement different aspects of the functionality described here. The system 1400 may include a base station 1402 (for example, base station 302, ...). Base station 1402 can receive signal (s) from one or more UEs 1404 via one or more receiving antennas (Rx) 1406 and transmit to one or more UEs 1404 via one or more transmit (TX) antennas 1408 In addition, base station 1402 can include a receiver 1410 that receives information from receiving antenna (s) 1406. According to an example, receiver 1410 can be operatively associated with a demodulator (DEMOD) 1412 that demodulates received information. Demodulated symbols can be analyzed by a processor 1414. Processor 1414 can be coupled to memory 1416, which can store data to be transmitted or received from UE (s) 1404 and / or any other suitable protocols, algorithms, information, etc. related to carry out the various actions and functions established here. For example, base station 1402 may employ processor 1414 to execute methodology 1000 and / or other similar and appropriate methodologies. Base station 1402 may further include a modulator 1418 that can multiplex a signal for transmission by a transmitter 1420 through antenna (s) 1408.
[00102] Processor 1414 can be a processor dedicated to analyzing the information received by receiver 1410, dedicated to generating information for transmission by transmitter 1420, or dedicated to controlling one or more base station modules 1402. According to another example, the Processor 1414 can analyze information received by receiver 1410, generate information for transmission by transmitter 1420, and control one or more base station modules 1402. One or more base station modules 1402 may include, for example, a PDCP module , an RLC module, a physical layer module, a coding module, a modulation module, a mapping module, a programmer, a selection pattern module and / or a dedicated reference signal module. In addition, although not shown, it is contemplated that the one or more base station modules 1402 may be part of processor 1414 or a plurality of processors (not shown).
[00103] FIG. 15 is an illustration of a system 1500 that can be used to implement different aspects of the functionality described here. The 1500 system can include an UE 1502 (e.g., UE 304, ...). UE 1502 can receive signal (s) from one or more base stations 1504 and / or transmit to one or more base stations 1504 through one or more antennas 1506. In addition, UE 1502 can include a receiver 1508 that receives information from antenna (s) 1506. According to an example, receiver 1508 can be operatively associated with a demodulator (DEMOD) 1510 that demodulates received information. Demodulated symbols can be analyzed by a 1512 processor. Processor 1512 can be coupled to memory 1514, which can store data to be transmitted or received from base station (s) 1504 and / or any other suitable protocols, algorithms, information, etc. , related to carry out the various actions and functions defined in this document. For example, UE 1502 may employ processor 1512 to perform the 1100 methodology and / or other similar and appropriate methods. UE 1502 may further include a modulator 1516 that can multiplex a signal for transmission by a transmitter 1518 through antenna (s) 1506.
[00104] Processor 1512 can be a processor dedicated to analyzing the information received by receiver 1508, dedicated to generating information for transmission by transmitter 1518, or dedicated to controlling one or more UE 1502 modules. According to another example, the processor 1512 can analyze information received by receiver 1508, generate information for transmission by transmitter 1518, and control one or more UE 1502 modules. One or more UE 1502 modules may include, for example, a PDCP module, an RLC module , a physical layer module, a coding module, a modulation module, a mapping module, an attribution analysis module, a reference signal evaluation module, and / or a channel estimation module. In addition, although not shown, it is contemplated that the one or more UE modules 1502 may be part of processor 1512 or a plurality of processors (not shown).
[00105] FIG. 16 shows an example of the wireless communication system 1600. The wireless communication system 1600 shows a base station 1610 and an UE 1650 for the sake of brevity. However, it should be appreciated that system 1600 may include more than one base station and / or more than one UE, wherein the additional base stations and / or UEs may be substantially similar to or different from the exemplary base station 1610 and UE 1650 described bellow. In addition, it should be appreciated that the base station 1610 and / or UE 1650 can employ the systems (Figs. 1-3 and 12-15) and / or methods (Figs. 10-11) described here to facilitate wireless communication between them.
[00106] At base station 1610, traffic data for a number of data streams is provided from a data source 1612 to a transmission data processor (TX) 1614. According to an example, each data stream can be transmitted via a respective antenna. The TX 1614 data processor formats, encodes and merges the data traffic stream based on a special coding scheme chosen for the data stream to provide encrypted data.
[00107] The encoded data for each data stream can be multiplexed with pilot data using Orthogonal Frequency Division Multiplexing (OFDM) techniques. Additionally or alternatively, the pilot symbols can be multiplexed by frequency division (FDM), multiplexed by time division (TDM), or multiplexed by code division (MDL). Pilot data is typically a known data standard that is processed in a known manner and can be used in UE 1650 to estimate the channel response. The multiplexed pilot and the encoded data for each data stream can be modulated (for example, mapped in symbol) based on a particular modulation scheme (for example, binary phase shift switching (BPSK), phase shift switching quadrature (QPSK), M phase shift switching (M-PSK), M quadrature amplitude modulation (M-QAM), etc.) selected for that data stream to provide modulation symbols. The data rate, encoding and modulation for each data stream can be determined by instructions carried out or provided by the 1630 processor.
[00108] The modulation symbols for the data streams can be provided to a MIMO TX 1620 processor, which can process the modulation symbols (for example, by OFDM). The MIMO TX 1620 processor then provides Nt modulation symbol streams for Nt transmitters (TMTR) 1622A to 1622t. In various modalities, the MIMO TX 1620 processor applies beamforming weights to the symbols in the data streams and the antenna from which the symbol is being transmitted.
[00109] Each transmitter 1622 receives and processes a respective symbol stream to provide one or more analog signals, and additionally conditions (for example, amplifies, filters and converts upwards) the analog signals to provide a modulated signal suitable for transmission over the channel MIMO. In addition, Nt signals modulated from transmitters 1622A to 1622t are transmitted from Nt antennas 1624a to 1624t, respectively.
[00110] In UE 1650, the transmitted modulated signals are received by Nr antennas 1652a to 1652r and the signal received from each antenna 1652 is provided to a respective receiver (RCVR) 1654a to 1654r. Each receiver, for example {1654 conditions, filters, amplifies and downwardly converts) a respective signal, digitizes the conditioned signal to provide samples and further processes the samples to provide a corresponding "received" symbol stream.
[00111] An RX 1660 data processor can receive and process the Nr symbol streams received from Nr receivers 1654 based on a particular receiver processing technique to provide Nt "detected" symbol streams. The RX 1660 data processor can demodulate, deinterleave and decode each detected symbol stream to retrieve traffic data for the data stream. Processing by the RX 1660 data processor is complementary to that performed by the MIMO TX 1620 processor and TX 1614 data processor at the base station 1610.
[00112] A 1670 processor can periodically determine which available technology to use as discussed above. In addition, processor 1670 can formulate a reverse link message comprising a matrix index portion and a rating value portion.
[00113] The reverse link message can comprise various types of information about the communication link and / or the received data flow. The reverse link message can be processed by a TX 1638 data processor, which also receives traffic data for a number of data streams from a data source 1636, modulated by a modulator 1680, conditioned by transmitters 1654a to 1654r, and transmitted back to base station 1610.
[00114] At base station 1610, modulated signals from UE 1650 are received by antennas 1624, conditioned by receivers 1622, demodulated by a demodulator 1640, and processed by a data processor RX 1642 to extract the reverse link message transmitted by the UE 1650. In addition, the 1630 processor can process the extracted message to determine which pre-coding matrix to use to determine the beam formation weights.
[00115] Processors 1630 and 1670 can direct (for example, control, coordinate, manage, etc.) operation on base station 1610 and UE 1650, respectively. The respective processors 1630 and 1670 can be associated with memory 1632 and 1672 which store program and data codes. 1630 and 1670 processors can also perform calculations to derive frequency and impulse response estimates for the uplink and downlink, respectively.
[00116] It should be understood that the aspects described here can be implemented in hardware, software, firmware, middleware, microcode, or any combination of these. For a hardware implementation, processing units can be implemented within one or more Application Specific Integrated Circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) ), field programmable port arrangements (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions described in this document, or a combination of these.
[00117] When the modalities are implemented in software, firmware middleware, or microcode, program code or code segments, they can be stored in a machine-readable medium, such as a storage component. A code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures or program instructions . A code segment can be coupled to another code segment or a hardware circuit passing and / or receiving information, data, arguments, parameters, or memory content. Information, arguments, parameters, data, etc. they can be passed, forwarded, or transmitted through any suitable means, including memory sharing, message passing, token passing, network transmission, etc.
[00118] For a software implementation, the techniques described here can be implemented with modules (for example, procedures, functions and so on) that perform the functions described in this document. The software codes can be stored in memory units and executed by the processors. The memory unit can be executed according to the processor or external to the processor, in which case it can be communicatively coupled to the processor through various means, as is known in the art.
[00119] What has been described above includes examples of one or more modalities. Of course, it is not possible to describe all possible combinations of components or methodologies for the purpose of describing the aspects mentioned above, but a person skilled in the art may recognize that many additional combinations and permutations of various aspects are possible. Therefore, the aspects described are intended to cover all such changes, modifications and variations that fall within the spirit and scope of the attached claims. In addition, insofar as the term "Includes" is used in any detailed description or claims, it is intended to be inclusive in a similar way to the term "comprising" as well as "understanding" is interpreted when used as a transitional word. in a claim.

权利要求:
Claims (13)
[0001]
1. Method (1000) that facilitates the sending of reference signals for channel estimation in a wireless communication environment, characterized by understanding: identifying (1002) a number of symbols from a subframe used for downlink transmission; obtain at least one time domain component of a second EU-RS user-specific reference signal pattern, UE-RS, by shifting at least one time domain component of a first EU-RS standard depending on a number of configurable control symbols; selecting (1004) one of the first UE-RS standard when the identified number of symbols corresponds to all symbols, and the second UE-RS standard when the identified number of symbols corresponds to less than all symbols; and map (1006) UE-RSs to resource elements of the subframe as a function of the selected UE-RS standard.
[0002]
2. Method according to claim 1, characterized in that the subframe is a regular subframe and when an identified number of symbols used for downlink transmission corresponds to all symbols.
[0003]
3. Method according to claim 1, characterized in that the subframe includes a Downlink Pilot Time Partition, DwPTS, when the identified number of symbols used for downlink transmission corresponds to less than all symbols.
[0004]
Method according to claim 1, characterized in that the subframe is sent to a retransmitter and includes one or more symbols reserved as interval symbols when the identified number of symbols used for downlink transmission corresponds to less than all symbols .
[0005]
Method according to claim 1, characterized in that a set of time domain components of the second UE-RS standard are displaced in time by a common number of symbols.
[0006]
Method according to claim 1, characterized in that frequency domain components of the second UE-RS standard are domain components of the same frequency as those of the first UE-RS standard.
[0007]
7. Wireless communication device (1200) that allows sending of reference signals in a wireless communication environment, characterized by comprising: mechanisms (1204) to identify a number of symbols from a subframe used for downlink transmission ; mechanisms for obtaining at least one time domain component of a second UE-RS user-specific reference signal pattern, UE-RS, by shifting at least one time domain component of a first EU-RS standard depending on a number of configurable control symbols; mechanisms (1206) for selecting one of the first UE-RS pattern when the identified number of symbols corresponds to all symbols, and the second UE-RS pattern when the identified number of symbols corresponds to less than all symbols; and mechanisms for mapping UE-RSs to resource elements of the subframe as a function of the selected UE-RS standard.
[0008]
8. Wireless communication apparatus according to claim 7, characterized in that the subframe is one of a regular subframe, a subframe that includes a Downlink Pilot Time Partition, DwPTS, or a subframe sent to a relay that includes one or more symbols reserved as interval symbols.
[0009]
9. Method (1100) that facilitates estimation of a channel in a wireless communication environment, characterized by understanding: identifying (1102) a number of symbols from a subframe assigned for downlink transmission; obtain at least one time domain component of a second EU-RS user-specific reference signal pattern, UE-RS, by shifting at least one time domain component of a first EU-RS standard depending on a number of configurable control symbols; recognizing (1104) one of the first UE-RS standard when the identified number of symbols corresponds to all symbols, and the second UE-RS standard when the identified number of symbols corresponds to less than all symbols; detect (1106) UE-RS in resource elements of the subframe specified by the recognized UE-RS standard; and estimating (1108) a channel based on the UE-RSs.
[0010]
10. Method according to claim 9, characterized in that the subframe is one of a regular subframe, a subframe that includes a Downlink Pilot Time Partition, DwPTS, or a subframe sent to a relay that includes one or more symbols reserved as interval symbols.
[0011]
Method according to claim 9, characterized in that frequency domain components of the second UE-RS standard are domain components of the same frequency as those of the first UE-RS standard.
[0012]
12. Wireless communication device (1300) that allows estimating a channel in a wireless communication environment, characterized by comprising: mechanisms (1304) to identify a number of symbols from a subframe assigned for downlink transmission; mechanisms for obtaining at least one time domain component of a second UE-RS user-specific reference signal pattern, UE-RS, by shifting at least one time domain component of a first EU-RS standard depending on a number of configurable control symbols; mechanisms (1306) for recognizing one of the first UE-RS pattern when the identified number of symbols corresponds to all symbols, and the second UE-RS pattern when the identified number of symbols corresponds to less than all symbols; mechanisms (1308) for detecting UE-RS in resource elements of the subframe specified by the recognized UE-RS standard; and mechanisms (1310) for estimating a channel based on UE-RSs.
[0013]
13. Memory characterized by comprising instructions that, when executed, perform a method as defined in any one of claims 1 to 6 or 9 to 11.

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AU2010279424A1|2012-03-15|

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EP2462714A2|2012-06-13|

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KR20120062742A|2012-06-14|

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JP5940641B2|2016-06-29|

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JP2013501472A|2013-01-10|

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KR101403637B1|2014-06-05|

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CN104796246A|2015-07-22|

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AU2010279424B2|2013-11-28|

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WO2011017467A3|2011-04-28|

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CA2769757A1|2011-02-10|

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HK1212523A1|2016-06-10|

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BR112012002564A2|2018-03-13|

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CN102484574A|2012-05-30|

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RU2524392C2|2014-07-27|

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EP3435582A1|2019-01-30|

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US8885541B2|2014-11-11|

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法律状态:
2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2021-01-05| B09A| Decision: intention to grant|

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2021-03-16| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 16/03/2021, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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US23129409P| true| 2009-08-04|2009-08-04|

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US61/231,294|2009-08-04|

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US12/848,969|US8885541B2|2009-08-04|2010-08-02|Extension of UE-RS to DWPTS|

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US12/848,969|2010-08-02|

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PCT/US2010/044466|WO2011017467A2|2009-08-04|2010-08-04|Extension of ue-rs to dwpts|

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