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    • 专利摘要:
    PROTOCOL FOR REVIEWING INFORMATION ABOUT CHANNEL STATE. Certain aspects of the present disclosure relate to a low overhead method for communicating Channel State Information (CSI) feedback in wireless communication systems with very high transmission capacity (VHT). The present disclosure also provides package formats for Null Data Packet Announcement (NDPA), CSI lookup and CSI feedback. In some cases, the CSI feedback may be too large to be carried in a single data access protocol (MAC) MPDU data unit or a Physical Layer protocol data unit (PHY), and a proposed protocol for CSI feed segmentation can then be used.
    公开号:BR112013001839B1
    申请号:R112013001839-9
    申请日:2011-07-25
    公开日:2021-02-23
    发明作者:Santosh Paul Abrahan；Simone Merlin；Hemanth Sampath；Sameer Vermani
    申请人:Qualcomm Incorporated；
    IPC主号:
    专利说明:

    Priority Claim according to 35 U.S.C. §119
    The present patent application claims the benefit of the US provisional patent application Serial No. 61/358 348 (Attorney Protocol Number 102480P1), filed on July 28, 2010, and the US provisional patent application Serial No. 61/372 546 (Attorney Protocol Number 102573P1), filed on August 11, 2010, assigned to his assignee and hereby expressly incorporated by reference. FUNDAMENTALS Field
    Certain aspects of the present disclosure relate generally to wireless communications and, more specifically, to a method for communicating Channel State Information (CSI) feedback. Foundations
    To address the problem of increasing bandwidth requirements that are required for wireless communication systems, different schemes are being developed to allow multiple user terminals to communicate with a single access point by sharing channel resources with the network. simultaneous achievement of high data transmission capacities. Multi-input and multiple-output (MIMO) technology represents an approach that has recently emerged as a popular technique for next generation wireless communication systems. MIMO technology has been adopted in multiple emerging wireless communication standards, such as the 802.11 standard from the Institute of Electrical and Electronic Engineers. IEEE 802.11 denotes a set of Area Network air interface standards
    Wireless Location (WLAN) developed by the IEEE 801.11 commission for short-range communications (from tens of meters to a few hundred meters, for example). The IEEE 802.11 WLAN standards body has established specifications for transmissions based on the very high transmission capacity (VHT) approach, which uses a 5 GHz carrier frequency (ie, the IEEE 802.11ac specification), or which uses a frequency 60 GHz carrier (ie, the IEEE 802.11ac specification), targeting aggregate transmission capacities greater than 1 Gigabits per second. One of the enabling technologies for the 5 GHz VHT specification is a larger channel bandwidth, which links two 40 MHz channels to an 80 MHz bandwidth, thus doubling the physical layer data rate (PHY) with a negligible increase in cost compared to that of the IEEE 801.lln standard. The MIMO system uses multiple (NT) transmitting antennas and multiple (NR) receiving antennas for data transmission. A MIMO channel formed by the NT transmitting antennas and the NR receiving antennas can be decomposed into Ns independent channels, which are also referred to as spatial channels, where Ns <min {NT, NR}. Each of the independent channels Ns corresponds to a dimension. The MIMO system can present an improved performance (greater transmission capacity and / or greater security, for example) if the additional dimensions created by the multiple transmitting and receiving antennas are used.
    In wireless networks with a single Access Point (AP) and multiple user stations (STAs), concurrent transmissions can occur on multiple channels to different stations, in the direction of both uplink and downlink. Many challenges are present in such systems. summary
    Certain aspects of the present disclosure provide communications equipment. The equipment generally includes a transmitter configured to transmit a first control message that requests that channel status information (CSI) be computed on each of one or more other equipment, and a receiver configured to receive a first report message. CSI with the computed CSI transmitted in response to the first control message, where the transmitter is also configured to transmit one or more second control messages, where each of the one or more second control messages requests a CSI report message with the CSI computed from a different equipment than the other equipment, the receiver being also configured to receive one or more CSI report messages in response to one or more second control messages, and each one of the first control message and one or more second control messages comprising a sequence number used to make each of the one or more if second control messages correspond to the first control message.
    Certain aspects of: the present disclosure provide a method for communications. The method generally includes transmitting a first control message that requests channel status information (CSI) to be computed on each of one or more devices, receiving a first CSI report message with the computed CSI transmitted in response to the first control message, transmit one or more second control messages, where each of the one or more second control messages requests a CSI report message with the CSIs computed from equipment other than the equipment, and receive one or more report messages CSI transmitted in response to one or more second control messages.
    Certain aspects of the present disclosure provide communications equipment. The equipment generally includes mechanisms for transmitting a first control message that requests that channel state information (CSI) be computed on each of one or more devices, and mechanisms for receiving a first CSI report message with the computed CSI. transmitted in response to the first control message, where mechanisms for transmitting are also configured to transmit one or more second control messages, where each of the one or more second control messages requests a CSI report message with the computed CSI's equipment other than equipment, and receiving mechanisms being also configured to receive one or more CSI report messages transmitted in response to one or more second control messages.
    Certain aspects of the present disclosure provide a communications software product. The computer program product generally includes a computer-readable medium that comprises executable instructions for transmitting a first control message that requests channel status information (CSI) to be computed on each of one or more devices, to receive a first, CSI report message with the computed CSI transmitted in response to the first control message, transmit one or more second control messages, where each of the one or more second control messages requests a CSI report message with the computed CSI equipment other than the equipment, and receive one or more CSI report messages transmitted in response to one or more second control messages.
    Certain aspects of the present disclosure provide an access point. The access point generally includes at least one antenna, a transmitter configured to transmit, through at least one antenna, a first control message that requests that channel status information (CSI) be computed on each one of a or more access terminals, and a receiver configured to receive, via at least one antenna, a first CSI report message with the computed CSI transmitted in response to the first control message, where the transmitter is also configured to transmit, by means of at least one antenna, one or more second control messages, where each of the one or more second control messages requests a CSI report message with the computed CSI from an access terminal other than the access terminals, and the receiver is also configured to receive, via at least one antenna, one or more CSI report messages transmitted in response to one or more second control messages ole.
    Certain aspects of the present disclosure provide an equipment of one or more equipment for communications. The equipment generally includes a receiver configured to receive a first control message that requests that channel status information (CSI) be computed on each of one or more devices, and a transmitter configured to transmit, in response to the first message. control, a CSI report message with the computed CSI, if the equipment is indicated in the first control message as the one that responds first with the CSI between the one or more equipment, where the receiver is also configured to receive a second control message that requests that the computed CSI give in transmitted from the equipment, if the equipment is not indicated in the first control message as the equipment that responds first with the CSI between one or more equipment, the transmitter also being configured to transmit the message CSI report response in response to the second control message received, and each of the first control message and the second the control message comprising a sequence number used to match the second control message to the first control message.
    Certain aspects of the present disclosure provide a method for communications. The method generally includes receiving, on a piece of equipment from one or more pieces of equipment, a first control message that requests that channel state information (CSI) be computed on each of the one or more pieces of equipment, transmitting in response to the control message, a CSI report message with the computed CSI, if the device is indicated in the first control message as the one that responds with the CSI between one or more devices, where the receiver is also configured to receive a second message control that requests that the CSI report message with the computed CSI be transmitted from the equipment, if the equipment is not indicated in the first control message as the equipment that responds first with the CSI among the one or more equipment, receive a second message control that requests that the CSI report message with the computed CSI be transmitted from the equipment, if the equipment is not indicated in the first message control act as the one that responds first with the CSI between one or more devices, and transmit the CSI report message in response to the second control message received.
    Certain aspects of the present disclosure provide an equipment of one or more equipment for communications. The equipment generally includes mechanisms for receiving a first control message that requests that channel state information (CSI) be computed on each of the one or more equipment, and a device for transmitting, in response to the first control message, a CSI report message with the computed CSI, if the equipment is indicated in the first control message as the one that responds first with the CSI among the one or more equipment, in which mechanisms to receive are also configured to receive a second control message which requests that the CSI report message with the computed CSI be transmitted from the equipment, if the equipment is not indicated in the first control message as the equipment that responds first with the CSI between one or more equipment, receive a second control message which requests that the CSI report message with the computed CSI be transmitted from the equipment, if the equipment is not indicated in the first control message as the one that responds first with the CSI between the one or more devices, and transmit the CSI report message in response to the second control message received. .
    Certain aspects of the present disclosure provide an access terminal for one or more access terminals. The access terminal generally includes at least one antenna, a receiver configured to receive, by means of at least one antenna, a first control message that requests that channel status information (CSI) be computed on each of the terminal. or access terminals, and a transmitter configured to transmit, via at least one antenna in response to the first control message, a CSI report message with the computed CSI, if the access terminal is indicated in the first control message as which responds first with the CSI between the terminal and the access terminals, where the receiver is also configured to receive, via at least one antenna, a second control message that requests the CSI report message with the CSI computed is transmitted from the access terminal, if the access terminal is not indicated in the first control message as the access terminal that responds first with the CSI between the ends l or access terminals, and the transmitter is also configured to transmit, via at least one antenna, the CSI report message in response to the second control message received. Brief Description Of Drawings
    So that the way in which the aforementioned features of the present disclosure are used can be understood in detail, a more specific description, briefly summarized above, can be made with reference to aspects, some of which are shown in the accompanying drawings. It should be noted, however, that the attached drawings show only certain typical aspects of this disclosure and should not, therefore, be considered as limiting its scope, as the description may admit other equally effective aspects.
    Figure 1 shows a diagram of a wireless communications network according to certain aspects of the present disclosure.
    Figure 2 shows a block diagram of an access point and exemplary user terminals according to certain aspects of the present disclosure.
    Figure 3 shows a block diagram of an exemplary wireless device according to certain aspects of the present disclosure.
    Figure 4 shows a Channel State Information (CSI) feedback protocol in accordance with certain aspects of the present disclosure.
    Figure 5 shows exemplary CSI request message formats according to certain aspects of the present disclosure.
    Figure 6 shows an exemplary format of a CSI report message in accordance with certain aspects of the present disclosure.
    Figure 7 shows an exemplary CSI feedback format with segmentation according to certain aspects of the present disclosure.
    Figure 8 shows a Consultation (poly) CSI message with segment indication according to certain aspects of the present disclosure.
    Figure 9 shows an exemplary protocol for transmitting CSI feedback on multiple Physical Layer Convergence Procedure Protocol Data Units (PPDUs) in accordance with certain aspects of the present disclosure.
    Figure 10 shows examples of a feedback size, CSI according to certain aspects of the present disclosure.
    Figure 11 shows exemplary operations that can be performed at an access point in accordance with certain aspects of the present disclosure.
    Figure 11A shows exemplary components capable of performing the operations shown in Figure 11.
    Figure 12 shows exemplary operations that can be performed on a user station in accordance with certain aspects of the present disclosure.
    Figure 12A shows exemplary components that are unable to perform the operations shown in Figure 12. Detailed Description
    Several aspects of the disclosure are described more fully below with reference to the accompanying drawings. This disclosure can, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Instead, these aspects are presented so that this disclosure is complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the present teachings, those skilled in the art should understand that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether it is implemented independently of or combined with any other aspects of the disclosure. Worst example, an equipment can be implemented or a method can be put into practice using any number of aspects presented here. In addition, the scope of the disclosure is intended to cover equipment or method that is practiced using another - structure, functionality or structure and functionality in addition to and other than the various aspects of the disclosure disclosed herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
    The word "exemplary" is used here to mean "which serves as an example, occurrence or illustration". Any aspect described here as "exemplary" should not necessarily be interpreted as preferred or advantageous compared to other aspects.
    Although specific aspects are described here, many variations and exchanges of these aspects fall within the scope of the disclosure. Although some benefits and advantages of the preferred aspects are mentioned, it is not intended to limit the scope of the disclosure to specific benefits, uses or objectives. Instead, aspects of the disclosure are intended to be widely applicable to different wireless technologies, system configurations, networks and transmission protocols, some of which are shown by way of example in the figures and in the following description of preferred aspects. The detailed description and drawings are merely illustrative of the disclosure and not limiting, the scope of the disclosure being defined by the appended and equivalent claims thereof. EXEMPLARY WIRELESS COMMUNICATION SYSTEM
    The techniques described here can be used in a variety of wireless broadband communication systems, including communication systems that are based on an orthogonal multiplexing scheme. Examples of such communication systems include Space Division Multiple Access (SDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC) -FDMA) and so on. An SDMA system can use directions that are sufficiently different to simultaneously transmit data belonging to multiple user terminals. A TDMA system can allow multiple user terminals to share the same frequency channel by dividing the transmission signal into different time partitions, each time partition being assigned to a different user terminal. A TDMA system can implement GSM or some other standards known in the art. An OFDMA system uses orthogonal frequency division multiplexing 5 (OFDMA), which is a modulation technique that partitions the total system bandwidth into multiple orthogonal subcarriers. These subcarriers can also be called tones, binaries, etc. With OFDM, each sub-carrier can be modulated with data 10 independently. An OFDM system can implement IEEE 802.11 or some other standards known in the art. A SC-FDMA system can use interleaved FDMA (IFDMA) to transmit on sub-carriers that are distributed across the system bandwidth, localized FDMA (LFDMA) 15 to transmit on an adjacent sub-carrier block or enhanced FDMA (EFDMA ) to transmit in multiple blocks of adjacent sub-carriers. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDMA. A SC-FDMA system can implement LTE-3GPP (Long-Term Evolution of the 3rd Generation Partnership Project) or some other standards known in the art. The present teachings can be incorporated into (implemented within or executed by) several 25 wired or wireless equipment (nodes, for example). In some ways, a node comprises a wireless node. Such a wireless node can, for example, provide connectivity to or with a network (an extended area network, such as the Internet or a cellular network) via a wired or wireless communication link. In some ways, a wireless node implemented in accordance with the present teachings can comprise an access point or an access terminal. An access point ("AP") can comprise, be implemented or known as NodeB, Radio Network Controller ("RNC"), eNodeB, Base Station Controller ("BSC"), Transceiver Base Station ("BTS") , Base Station ("BS"), 5 Transceiver Function ("TF"), Radio Router, Radio Transceiver, Basic Service Set ("BSS"), Extended Service Set ("ESS"), Radio Station Base ("RBS") or some other terminology. In some implementations, an access point may comprise a set-top box converter kiosk, a media center, or any other suitable device that is configured to communicate over a wireless or wired medium. According to certain aspects of the present disclosure, the access point can operate according to the 802.11 family of 15 wireless communication standards of the Institute of Engineers Electrical and Electronic Equipment (IEEE).
    An access terminal ("AT") can comprise, be implemented or known as an access terminal, subscriber station, subscriber unit, mobile station, remote station, remote terminal, user terminal, user agent, user device , user equipment, user station or some other terminology. In some implementations, an access terminal may comprise a cell phone, a cordless phone, a Session Logon Protocol ("SIR") phone, a wireless local loop station ("WLL"), a digital assistant personal device ("PDA"), a handheld device that has wireless capability, a Station ("STA") or some other suitable processing device connected to a wireless modem. Therefore, one or more aspects taught here can be incorporated into a phone (a cell phone or smart phone, for example), a computer (a laptop, for example), a portable communication device, a computing device (a personal data assistant), a tablet, an entertainment device (a music or video device or a satellite radio, for example), a television monitor, a reversible camera, a video camera security video, a digital video recorder (DVR), a global positioning system device or any other suitable device that is configured to communicate wirelessly or wired. In some ways, the node is a wireless node. According to certain aspects of the present disclosure, the access terminal can operate in accordance with the IEEE 802.11 family of wireless communication standards.
    Figure 1 shows an access system, multiple by multiple-entry multiple-exit (MIMO) 100 with access points and user terminals. For simplicity, only one access point 110 is shown in Figure 1. An access point is generally a fixed station that: communicates with user terminals and can also be referred to as a base station or some other terminology. A user terminal can be fixed or mobile and can also be referred to as a mobile station, wireless device or some other terminology. Access point 110 can communicate with one or more user terminals 120 at any given time on the downlink or on the uplink. The downlink (ie, direct link) is the communication link from the access point to the user terminals, and the uplink (ie, reverse link) is the communication link from the user terminals to the access point. . A user terminal can also communicate in a non-hierarchical manner with another user terminal. A system controller 130 attaches to and provides coordination and control for the access points.
    Although parts of the following disclosure describe user terminals 120 capable of communicating via Space Division Multiple Access (SDMA), for certain aspects user terminals 120 may also include some user terminals that do not support SDMA. For such aspects, therefore, an AP 110 can be configured to communicate with both SDMA and non-SDMA user terminals. This approach can adequately allow older versions of user terminals ("legacy" stations) to remain in use in an enterprise, extending their useful life, while allowing newer SDMA user terminals to be introduced as considered, appropriate. System 100 uses multiple transmitting and receiving antennas to transmit data on the downlink and on the uplink. Access point 110 is equipped with Nap antennas and represents the multiple inputs (MI) in downlink transmissions and the multiple outputs (MO) in upstream transmissions. A set of K selected user terminals 120 collectively represents the multiple outgoing transmissions on the downlink and the multiple incoming transmissions on the uplink. For pure SDMA, it is desirable to have Nap> K> 1 if the data symbol streams to the K user terminals are not multiplexed in code, frequency or time by some devices. K can be greater than Nap if the data symbol streams can be multiplexed using TDMA technique, different code channels with CDMA, disjointed sets of subbands with OFDM and so on. Each selected user terminal transmits user-specific data to and / or receives user-specific data from the access point. In general, each selected user terminal can be equipped with one or multiple antennas (ie Nut 1). The K selected user terminals can have the same number or a different number of antennas. The SDMA 100 system can be a time division duplex system (TDD) or a frequency division duplex system (FDD). For a TDD system, the downlink and the uplink share the same frequency band. For an FDD system, the downlink and the uplink use different frequency bands. The MIMO 100 system can also use a single carrier or multiple carriers for transmission. Each user terminal can be equipped with a single antenna (in order to keep costs low, for example) or multiple antennas (if the additional cost can be borne, for example). System 100 can also be a TDMA system if user terminals 120 share the same frequency channel by dividing transmission / reception into different time partitions, each time partition being assigned to a different user terminal 120. The wireless system 100 shown in Figure 1 can operate according to the IEEE 802.11ac wireless communication standard. IEEE 802.11ac represents a new IEEE 802.11 amendment that provides higher transmission capacity over IEEE 802.11 wireless networks. The highest transmission capacity can be achieved by multiple measures, such as parallel transmissions to multiple stations 120 at once, or by using a larger channel bandwidth (from 80 MHz to 160 MHz, for example). IEEE 802.11ac is also referred to as the Very High Throughput (VHT) wireless communication standard.
    Figure 2 shows a block diagram of the access point 110 and two user terminals 120m and 120x in the MIMO 100 system. The access point 110 is equipped with Nt antennas 224a to 224t. The 120m user terminal is equipped with Nut, 252m to 252mu antennas, and the 120x user terminal is equipped with Nut, 252x to 252xu antennas. Access point 110 is a transmitting entity for the downlink and a receiving entity for the uplink. Each user terminal 120 is a transmitting entity for the uplink and a receiving entity for the downlink. As used herein, a "transmitting entity" is equipment - or an independently powered device capable of transmitting data over a wireless channel, and a "receiving entity" is an independently powered device or device capable of receiving data. through a wireless channel. In the following description, the subscript "dn" denotes the downlink, the subscript "up" denotes the uplink, Nu user terminals are selected for simultaneous transmission on the uplink, Ndn user terminals are selected for simultaneous transmission on the downlink, Nup may or may not be equal to Ndn θ Nup and Ndn may be static values or may change for each programming interval. The beam direction or some other spatial processing technique can be used at the access point and at the user terminal.
    On the uplink, at each user terminal 120 selected for uplink transmission, a TX 288 data processor receives traffic data from a data source 286 and control data from a controller 280. The TX 288 data processor processes ( encodes, interleaves and modulates, for example) the traffic data for the user terminal based on the coding and modulation schemes associated with the rate selected for the user terminal and generates a flow of data symbols. A TX 290 space processor performs spatial processing in the data symbol stream and generates Nut, m transmission symbol streams for the Nut, m antennas. Each transmitting unit 5 (TMTR) 254 receives and processes (converts to analog, amplifies, filters and converts to a higher frequency, for example) a respective stream of transmission symbols in order to generate an uplink signal. Nut, m transmitting units 254 generate Nut, m uplink signals 10 for transmission of Nut, m antennas 252 to the access point.
    Nup user terminals can be programmed for simultaneous transmission on the uplink. Each of these user terminals performs spatial processing 15 on its data symbol stream and transmits its set of transmission symbol streams on the uplink to the access point.
    At access point 110, NAP antennas 224a to 224ap receive uplink signals from all 20 Nup user terminals that transmit on the uplink. Each antenna 224 sends a received signal to a respective receiving unit (RCVR) 222. Each receiving unit 222 performs processing complementary to that performed by the transmitting unit 254 and generates a flow of 25 symbols received. A space processor RX 240 performs spatial receiver processing on the Nap symbol streams received from the Nap receiving units 222 and generates Nup recovered uplink data symbol streams. The spatial processing of the receiver is performed according to the inversion of the channel correlation matrix (CCMI), with the minimum mean square error (MMSE), with the temporary interference cancellation (SIC) or with some other technique. Each stream of uplink data symbols retrieved is an estimate of a stream of data symbols transmitted by a respective user terminal. An RX 242 data processor processes (demodulates, deinterleaves and decodes, for example) each stream of uplink data symbols retrieved according to the rate used for that stream in order to obtain decoded data. The decoded data for each user terminal can be sent to a data warehouse 244 for storage and / or to a controller 230 for further processing.
    On the downlink, at access point 110, a TX 210 data processor receives traffic data from a data source 208 to N ^ n user terminals programmed for transmission on the downlink, control data from a controller 230 and possibly others data from a programmer 234. Different types of data can be sent on different transport channels. The TX 210 data processor processes (encodes, merges and demodulates, for example) traffic data for each user terminal based on the rate selected for that user terminal. The TX 210 data processor provides downlink data symbol streams to the user terminal Ndn. A TX 220 space processor performs spatial processing (such as precoding or bundling, as described in the present disclosure) on the Ndn downlink data symbol streams and provides Nap transmission symbol streams to the Nap antennas. Each transmitting unit 222 receives and processes a respective stream of transmission symbols in order to generate a downlink signal. Nap transmitting units 222 provide Nap downlink signals for transmitting Nap antennas 224 to user terminals.
    At each user terminal 120, Nut, m antennas 252 receive Nap downlink signals from access point 110. Each receiver unit 254 processes a signal received from a connected antenna 252 and generates a stream of received symbols. A RX 260 space processor performs spatial processing on Nut, m symbol streams received from Nut, m receiver units 254 and generates a stream of retrieved downlink data symbols to the user terminal. Spatial receiver processing is performed according to CCMI, MMSE or some other technique. An RX 27Ô data processor processes (demodulates, deinterleaves and decodes, for example) the flow of downlink data symbols in order to obtain decoded data for the user terminal.
    At each user terminal 120, a channel estimator 278 estimates the downlink channel response and provides downlink channel estimates, which can include channel gain estimates, SNR estimates, noise variance and so on. Similarly, a channel estimator 228 estimates the uplink channel response and provides uplink channel estimates. A controller 280 for each user terminal typically derives the spatial filter matrix for the user terminal based on the downlink channel response matrix Hdn, m for that user terminal. Controller 230 derives the spatial filter matrix for the access point based on the effective uplink channel response matrix Hup, eff 'Controller 280 for each user terminal can send feedback information (such as, for example, downlink and / or uplink eigenvectors, eigenvalues, SNR estimates and so on) to the access point. Controllers 230 and 280 also control the operation of several processing units at access point 110 and user terminal 120, respectively.
    In one aspect of the present disclosure, one or more Channel Status Information (CSI) request messages may be transmitted from access point 110 to one or more of user terminals 120, where requested CSI reports may be related to user terminal channels 120. CSI report messages may comprise broadcast and / or unicast messages. In response to the CSI message / request / messages received at a user terminal 120, a CSI feedback report can be transmitted from that user terminal 120 back to access point 120. Certain aspects of the present disclosure support frame formats low overhead for CSI request messages and CSI feedback report messages.
    Figure 3 shows several components that can be used in a wireless device 302 that can be used within the wireless communication system 100. Wireless device 302 is an example of a device that can be configured to implement the various methods here described. Wireless device 302 can be an access point 110 or a user terminal 120.
    The wireless device 302 can include a processor 304, which controls the operation of the wireless device 302. Processor 304 can also be referred to as a central processing unit (CPU). Memory 306, which can include both an exclusive read-only memory (ROM) and random access memory (RAM), provides instructions and data to processor 304. A portion of memory 306 can also include non-volatile random access memory ( NVRAM). Processor 304 typically performs logical and arithmetic operations based on program instructions stored within memory 306. Instructions in memory 306 can be executable to implement the methods described herein.
    The wireless device 302 may also include a housing 308, which may include a transmitter 310 and a receiver 312 to enable data transmission and reception between the wireless device 302 and a remote location. The transmitter 310 and receiver 312 can be combined into a transceiver 314. A single or series of transmitting antennas 316, which can be attached to housing 38 and electrically coupled to transceiver 314. The wireless device 302 can also include (not shown) ) multiple transmitters, multiple receivers and multiple transceivers.
    The wireless device 302 may also include a signal detector 318, which can be used in an effort to detect and quantify the level of the signals received by the transceiver 314. The signal detector 318 can detect such signals as total energy, energy per sub - symbol carrier, spectral power density and other signals. The wireless device 302 may also include a digital signal processor (DSP) 320 for use in signal processing.
    In one aspect of the present disclosure, one or more CSI request messages can be transmitted from wireless device 302 to one or more user terminals (not shown in Figure 3). In another aspect, one or more CSI request messages can be transmitted from an access point (not shown in Figure 3) to wireless device 302, where the wireless device can be one of the user terminals served by the point access. CSI request messages can comprise broadcast and / or unicast messages. In response to the message or messages and CSI request received on the wireless device 302, a CSI feedback report can be transmitted from the wireless device 302 to the server access point. Low overhead frame formats for CSI request messages and CSI feedback report messages are proposed in this disclosure. The various components of the wireless device 302 can be coupled together by a bus system 322, which can include a power bus, a control signal bus and a condition signal bus in addition to a data bus. PROTOCOL TO COMMUNICATE REPORT, REPORTING CHANNEL STATE INFORMATION
    Certain aspects of the present disclosure support low overhead methods for communicating CSI feedback reports from user stations (STAs) 120 to an access point (AP) 110 of wireless system 100 shown in Figures 1-2. The present disclosure also proposes a package format for the Null Data Packet Announcement (NDPA) message, CSI Consultation message and CSI feedback message. In certain cases, the CSI feedback may be too large to be carried on a single Media Access Control Protocol Data Unit (MPDU) or a Physical Layer Convergence Procedure Protocol (PPDU) Data Unit. In these cases, a protocol for CSI feedback segmentation can be used according to certain aspects of the present disclosure.
    Figure 4 shows an example of a CSI 400 feedback protocol according to certain aspects of the present disclosure. An AP can transmit to an array of user STAs an NDPA 402 frame followed by a Null Data Packet (NDP) frame 404 after a Short Inter-Frame Symbol (SIFS) 406 period. Association (AIDs) of the STAs expected to transmit computed CSI feedback messages to the AP.
    STAs that are not listed in the NDPA can ignore the following NDP 404 table. In one aspect, the NDP frame 404 may comprise a sound frame used by each of the STAs to compute a corresponding CSI feedback associated with that STA. A first STA listed within the NDPA 402 frame can transmit a CSI 408 feedback over a SIFS period after the transmission of the NDP 404 frame, as shown in Figure 4. Other STA Identifiers (IDs) can be queried by using a CSI Query message (a CSI 410 Consultation, for example) for each STA.
    Figure 5 shows formats; copies of CSI 500 and 550 request messages in accordance with certain aspects of the present disclosure. The CSI 500 request message can be of the control board type and can comprise an NDPA message (that is, a broadcast control message). The CSI 550 request message can also be of the control board type and can comprise a CSI query message (i.e., a unicast control message). For certain aspects of the present disclosure, the CSI 5000 request message and the CSI 550 request message can comprise the same unified structure.
    In one respect, the CSI request message 500 may comprise at least one of: a frame control field 502, a duration field 504, a destination address (DA) field 506, a source address field ( SA) 508, a CSI Sequence field 510, a Multiple STAs information field 512, a Cyclic Redundancy Check (CRC) field 514 or a control sub-type field 516. In one respect, the field of frame control 502 may indicate that, with the use of extended subtypes, the CSI 500 request message may correspond to the NDP announcement. The DA 506 field can be configured to broadcast / multicast the ID to multiple target STAs. The CSI 510 string field can be used to match a CSI query to an NDPA match. The multiple STA 512 information field can comprise the association ID of each STA requested to compute the CSI feedback. In one respect, the control subtype field 516 can be used to indicate that the CSI 500 request message represents an NDPA message.
    In one respect, the CSI 550 request message may correspond to a CSI query dedicated to one of the target STAs and may comprise 'at least one of: a frame control field 552, a field duration 554, a field DA 556, an SA 558 field, a CSI sequence field 560, a CRC field 562 or a control subtype field 564. In one respect, frame control field 552 can indicate that, with the use of sub - extended types, the CSI 550 request message can match the CSI query. The DA 556 field can be configured as a STA address intended to be queried for the CSI 550 request message. The CSI 560 string value can be used to match the CSI 550 query with a corresponding NDPA (ie, the message NDPA 500). In one respect, the control subtype field 564 can indicate a type of CSI query.
    Figure 6 shows an exemplary format of a CSI 600 report message, which comprises CSI feedback in accordance with certain aspects of the present disclosure. The CSI 600 report message may comprise at least one of: a frame control field 602, a duration field 604, a DA 606 field, an SA 608 field, a CSI 610 feedback control field, a feedback field CSI 612 with the computed CSI, a CRC 614 field or a control subtype field 616. The CSI report message can be of the control type. In one respect, the control subtype field 616 may indicate that message 600 represents the CSI report message with CSI feedback. As shown in Figure 6, the CSI 610 feedback control field can comprise at least one of: a CSI 618 sequence subfield, which can be set to a CSI sequence number from an NDPA / CSI query, one subfield 620 with multiple columns of CSI feedback matrix, a subfield 622 with multiple rows of CSI feedback matrix or a field 624 with reserved bits. SEGMENTATION / REASSEMBLY FOR CHANNEL STATE INFORMATION
    In certain cases, the number of CSI feedback bytes may be too large to transmit the entire CSI feedback at once. In the case of a compressed 8x4 160 MHz bandwidth, for example, the number of bytes for the CSI feedback may be approximately equal to 15 K. A large CSI feedback may not be able to fit into a Data Unit. MAC Protocol (MPDU) due to imitations of MPDU size. The size of the MPDU may be limited by an Aggregated MAC Protocol Data Unit (A-MPDU) delimiter and / or by the capabilities of the STA.
    Certain aspects of the present disclosure support additional capabilities that may be required to accommodate a large CSI feedback. For example, CSI feedback can be segmented into multiple MPDUs, since the IEEE 802.lln specification supports CSI feedback segmentation. The present disclosure proposes the transmission of CSI feedback segments within multiple MPDUs of an A-MPDU.
    Figure 7 shows an exemplary format of a CSI 700 report message segmented according to certain aspects of the present disclosure. The CSI 700 report message can be of the control board type. As shown in Figure 7, the CSI 702 feedback control field of the CSI 700 report message can be extended by one for segmentation control. A first segment subfield 704 (a bit, for example) can indicate whether a corresponding MPDU represents the first segment of the CSI feedback. A "Remaining Segments" 706 subfield (which comprises seven bits, for example) can indicate the number of segments of the CSI feedback that remain for transmission after the current MPDU. In one respect, a control subtype field 708 can be included within the CSI 700 report message, as shown in Figure 7. In this case, the control subtype field 708 may indicate that message 700 represents the CSI report message with a segment of the CSI feedback. For certain aspects of the present disclosure, it may be necessary to transmit specific frames in response to a CSI query, if a corresponding NDPA has not been received at a specific STA that is requested by the CSI query to transmit the CSI associated with that STA. In one aspect of the present disclosure, STA can transmit a normal Confirmation frame (ACK), which confirms the successful receipt of the CSI query. In another aspect of the present disclosure, STA can transmit a table of Null CSI, which confirms the successful receipt of the CSI consultation in the event that the corresponding NDPA has not been received.
    The CSI 700 report message shown in Figure 7 can also represent the CSI Null board. In this case, a CSI 710 sequence subfield of the CSI 702 feedback control field can be set to a sequence number of the received CSI query, subfields 712 and 714, which respectively indicate the number of columns and the number of rows of the CSI feedback matrix, both can be set to zero, a sub-field of bandwidth 716 can comprise any value, a sub-field of type of CSI feedback can be set to a predefined value, the first segment subfield 704 can comprise a value of one and the value of the "Remaining Segments" subfield 706 can be set to zero. The variable CSI feedback portion 720 of the Null 700 CSI frame may not be transmitted, that is, the STA CSI may not be transmitted within the Null 700 CSI frame.
    In one aspect of the present disclosure, the CSI 718 feedback type subfield of the regular CSI report message 700 can comprise at least one of: information about the method used to compute the CSI 720 feedback, information about the method used to compress the CSI 720 feedback, information about the type of STA that transmits the CSI 700 report message and about the demodulation technology applied in this STA or information about the level of fidelity of the CRC sum stored in the CRC 722 field of the CSI 700 report message .
    According to certain aspects of the present disclosure, an A-MPDU may be allowed to comprise multiple MPDUs, if each of the MPDUs does not require confirmation to confirm its successful receipt at an AP. The use of an "End of Frame (EOF)" bit within such A-MPDU can be identical to that of the case with Quality of Service (QoS) data, that is, the "EOF" bit can be set in a delimiter in followed by the last MPDU. The AP can make a new query on CSI feedback, if the AP detects the lack of any of the segments.
    A large CSI feedback can also span multiple Physical Layer Convergence Procedure Protocol Data Units (PPDUs). However, the size of the PPDU can be limited in the AP / in the STA. In addition, the transmission time of a single PPDU can be long due to the Modulation-Coding Scheme (MCS) used.
    A CSI query for the next STA can be transmitted from an AP a SIFS time period after receiving the previous CSI feedback. STAs can be limited to transmitting exactly one PPDU. Therefore, multiple PPDUs may require the ability to query for separate CSI feedback segments.
    Certain aspects of the present disclosure support the inclusion of an indication about remaining segments of CSI feedback in the STA 802 Query Information field of a CSI 800 query, as shown in Figure 8. If the STA Query Information field is missing from the CSI query , an STA can always transmit CSI starting from a first segment of one or more CSI feedback segments. If the STA Inquiry Information field is present, an STA can transmit a CSI feedback based on the indication of. Remaining segments 804 of the CSI 800 query. In one respect, a control subtype field 806 can be included within the CSI query 800. Similarly, for the CSI 550 query shown in Figure 5, the subtype field control byte 806 can indicate that the transmitted CSI request message 800 represents the CSI query with the segment indication.
    Figure 9 shows an exemplary 900 protocol for transmitting CSI feedback across multiple PPDUs in accordance with certain aspects of the present disclosure. It can be seen that, if a CSI request message (a 902 message or a 904 message, for example) does not carry a "Remaining Segments" indication, then an STA (a STA 906 or a STA 908, for example) can be transmitting a CSI feedback (a CSI 910 or a CSI 912 feedback, for example) starting from a first segment of that CSI feedback. In one respect, an AP that sends the CSI request may be able to determine if any segments are missing from the. combination of the first segment bit and the "Remaining Segments" indications received. The AP can request the missing / remaining segments using a CSI query with an indication of the remaining segments.
    Figure 10 shows 1000 examples of a CSI feedback size according to certain aspects of the present disclosure. The 1000 tables shown show an approximate number of bytes in the CSI feedback for different channel bandwidths and different antenna configurations. For example, 16 bits can be used for each tone for each channel element in order to account for the compression. Tone grouping can also be applied, for example, groups of two, three and four tones can be considered (only one CSI feedback tone per group).
    Figure 11 shows 1100 exemplary operations that can be performed at an access point in accordance with certain aspects of the present disclosure. In 1102, the access point can transmit a first control message that requests that CSI be computed on each or more devices (that is, user STAs). In 1104, the access point can receive a first CSI report message with the computed CSI transmitted in response to the first control message. In 1106, the access point can transmit one or more second control messages, in which each of the one or more second control messages can request a CSI report message with the CSI computed from equipment other than the equipment. In 1108, the access point can receive one or more CSI report messages transmitted in response to one or more second control messages, where each of the first control message and one or more second control messages comprises a number sequence (i.e., a CSI sequence field) used to match each of the one or more second control messages with the first control message.
    In one respect, each of the second control messages can be transmitted at a different time. In addition, each of the CSI report message or messages can be received immediately after the transmission of one of the second control messages requesting that CSI report message and before the transmission of any other second control messages.
    In one aspect of the present disclosure, a Network Allocation Vector (NAV) within the first control message can indicate the time required to transmit at least one of the first control message or one or more second control messages. During this indicated time, a means can be reserved to transmit at least one of the first control message or one or more second control messages.
    The first control message may comprise an indication that the CSIs computed by all equipment are expected to be communicated simultaneously as a Multi-Spatial Division Multiple Access (SDMA) transmission from Multiple Users (MU-MIMO ) uplink. Alternatively, the first control message may comprise an indication that the CSIs computed by the equipment are expected to be communicated sequentially. In one respect, the duration field of the first control message can indicate the duration of the MU-MIMO transmission. In another aspect, the STA information field of the first control message can indicate the duration of the MU-MIMO transmission.
    In one respect, the first control message and one or more second control messages can be transmitted according to the IEEE 802.11 family of request standards. The transmission of the first control message may comprise broadcasting the first control message to the equipment, and the transmission of one or more second control messages may be a single-broadcast transmission to each of the equipment.
    In one respect, each of the first control message and one or more second control messages can comprise an IEEE 802.11 wireless standards control framework. In addition, each of the first CSI report message and the CSI report message or messages can comprise an IEEE 802.11 wireless standards control framework.
    In another respect, each of the first control message and one or more second control messages can comprise an IEEE 802.11 Wireless Communication Standards No Action Confirmation frame. In addition, each of the first CSI report message and the CSI report message or messages may comprise a No Action Confirmation frame of IEEE 802.11 wireless communication standards.
    In one aspect of the present disclosure, the STA information field of the first control message can comprise information about the Modulation-Coding Scheme (MCS) used by other equipment in transmitting the first CSI report message and the CSI report message or messages . In addition, the Confirmation field (ACK) within one of the second control messages can confirm the successful reception, by the other devices, of the most recently transmitted CSI computed on that other device, where the ACK field can comprise the sequence number. of the most recently transmitted CSI. In addition, the control subtype field within one of the second control messages dedicated to one of the other devices may indicate that a second control message represents a CSI query from a set of CSI query messages, and each CSI query of the set may request a different segment from the CSI computed on that
    Figure 12 shows 1200 exemplary operations that can be performed on a user STA of one or more STAs according to certain aspects of the present disclosure. In 1202, the STA can receive, for example, from an access point, a first control message that requests a CSI to be computed on each of the STA or STAs. In response to the first control message, the STA can transmit, in 1204, a CSI report message with the computed CSI, if the STA is indicated in the first control message as the STA that responds first with the CSI among the one or more equipment. In 1206, the STA can receive, for example, from the access point, a second control message that requests that the CSI report message with the computed CSI be transmitted from the STA, if the STA is not indicated in the first control message as the STA that responds first with the CSI between the STA or STAs. In 1208, STA can transmit the CSI report message in response to the second control message received, where each of the first control message and the second control message can comprise a sequence number used to match the second control message with the first control message.
    In one aspect of the present disclosure, the STA may receive a control message that requests another CSI to be transmitted from the STA. The STA can then transmit a Null CSI frame that acknowledges receipt of the control message, if another control message, which requests another CSI to be computed on each of the STA or STAs, has not been received at the STA. The Null CSI frame can comprise at least one of: a CSI sequence number fixed to the sequence number of the received control message, an indication that the other CSI does not: is transmitted within the Null CSI frame, a field of type of CSI feedback set to a predefined value or an indication that the number of segments in which the Null CSI frame is transmitted is equal to one.
    To summarize, the present disclosure proposes a frame format for CSI feedback communications. Management of Group Identifier (Group ID) can be separated from the CSI protocol, that is, only AIDs of
    STA can be indicated in an NDPA message. In one respect, there may be no indication of the number of STAs in the NDPA, and this information can be inferred from the length of the NDPA.
    In addition, no field can be specified for a "first respondent STA". The first STA AID listed in the NDPA may implicitly represent the first respondent. In one respect, a single control board format can be used for both NDPA and CSI Consultation. NDPA and CSI Query can carry a sequence number to allow STAs to match the CSI Query to the corresponding NDPA. One or more bits within the STA Information field of a broadcast control message (i.e., the NDPA message) can comprise a CSI sequence number and can be used to confirm the most recently (previously) received CSI feedback, as well as to accommodate rate adaptation for transmissions, CSI feedback. In one respect, the CSI sequence number can comprise a dialog token like that used in IEEE 802.1 action frames. In another aspect, the CSI sequence number may comprise a time stamp derived from a timing synchronization function.
    The various method operations described above can be performed by any suitable device capable of performing the corresponding functions. The device may include various components and / or hardware and / or software modules, which include, but are not limited to, a circuit, an application specific integrated circuit (ASIC) or processor. Generally, in the case of operations shown in the Figures, these operations can have corresponding device components plus function with similar numbering. For example, operations 1100 and 1200 shown in Figures 11 and 12 correspond to components 1100A and 1200A shown in Figures 11A and 12A.
    As used herein, the term "determine" covers a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (such as searching a table, database or other data structure), checking and the like. In addition, "determining" may include receiving (receiving information, for example), accessing (accessing data in a memory, for example) and the like. In addition, "determining" may include resolving, selecting, choosing, establishing and the like.
    As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including unique elements. As an example, "at least one of: a, b or c" is intended to cover: a, b, c, a-b, a-c, b-c and a-b-c.
    The various method operations described above can be performed by any suitable device capable of performing the operations, such as various components, circuits and / or hardware and / or software modules. Generally, any operations shown in the Figures can be performed by corresponding functional devices capable of performing the operations.
    For example, the mechanisms for transmitting may comprise a transmitter, such as, for example, transmitter 222 of Figure 2 of access point 110, transmitter 254 of Figure 2 of user terminal 120 or transmitter 310 of Figure 3 of the device without wire 302. The receiving mechanisms may comprise a receiver, such as, for example, receiver 222 of Figure 2 of access point 110, receiver 254 of Figure 2 of user terminal 120 or receiver 312 of Figure 3 of the device without wire 302. The mechanisms for computing may comprise an application-specific integrated circuit, such as, for example, processor 270 in Figure 2 of user terminal 120 or processor 304 in Figure 3 of wireless device 302.
    The various blocks, modules and illustrative logic circuits described in connection with the present disclosure can be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an array of field programmable ports (FPGA) or other programmable logic device (PLD), discrete port or transistor logic, discrete hardware components or any combination of them designed to perform the functions described here. A general purpose processor can be a microprocessor, but alternatively the processor can be any processor, controller, microcontroller or conventional state machine available on the market. A processor can also be implemented as a combination of computing devices, such as, for example, a combination of DSP and microprocessor, a series of microprocessors, one or more microprocessors in conjunction with a DSP core or any other such configuration.
    The method or algorithm steps described in connection with the present disclosure can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in any form of storage medium that is known in the art. Some examples of storage media that can be used include random access (RAM), exclusive read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM and so on. A software module can comprise a single instruction, or many instructions, and can be distributed across multiple different code segments, between different programs, and across multiple storage media. A storage medium can be coupled to a processor so that the processor can read information from, and write information to, the storage medium. Alternatively, the storage medium can be integrated with the processor. The methods disclosed herein comprise one or more steps or actions to carry out the described. The steps and / or method actions can be interchanged with each other without abandoning the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of the specific steps and / or actions can be modified without abandoning the scope of the claims.
    The functions described can be implemented in hardware, software, firmware or any combination of them. If implemented in software, the functions can be stored as one or more instructions or code in a computer-capable medium. Computer-readable media include both computer storage media and communication media that include any medium that facilitates the transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not by way of limitation, such computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage devices or any other medium that may be used for carry or store desired program code in the form of instructions or data structures that can be accessed by a computer. In addition, any connection is appropriately referred to as 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 (IR) ), 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 media. The term disc (disk and disc), as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray® disc, where usually disks reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Thus, in some respects, passive computer-readable means may comprise non-transient passable computer-readable means (tangible means, for example). In addition, for other aspects, the passable computer-readable means may comprise transient passable computer-readable means (a signal, for example). Combinations of them should also be included within the scope of the computer-readable means.
    Thus, certain aspects may comprise a computer program product to perform the operations presented here. For example, such a computer program product may comprise a computer-readable medium that has instructions stored (and / or encoded) in it, the instructions being executable by one or more processors to perform the operations described herein. For certain aspects, the computer program product may include packaging material.
    Software or instructions can also be transmitted through a transmission medium. For example, if the software is transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, then axial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave, are included in the definition of transmission medium.
    In addition, it should be understood that the modules and / or other appropriate mechanisms for executing the methods and techniques described herein can be downloaded and / or otherwise obtained by a user terminal and / or base station, as applicable. For example, such a device can be coupled to a server to facilitate the transfer of mechanisms to execute the methods described here. Alternatively, several methods described herein can be provided via storage mechanisms (such as, for example, RAM, ROM, a physical storage medium such as a compact disk (CD) or floppy disk, etc.), so that a storage terminal user and / or base station can obtain the various methods by coupling or providing the storage mechanisms for the device. In addition, any other suitable technique for providing the methods and techniques described herein for a device can be used.
    It should be understood that the claims are not limited to the precise configuration and components shown above. Various modifications, alterations and variations can be introduced in the layout, operation and details of the systems, methods and equipment described herein without abandoning the scope of the claims.
    Although the above refers to aspects of the present disclosure, other aspects of the disclosure can be conceived without abandoning its basic scope, and its scope is determined by the claims that follow.
    权利要求:
    Claims (15)
    [0001]
    1. Method for communications, comprising: transmitting a first control message (402), to a plurality of other equipment (120), the first control message requesting that channel status information, CSI, be computed based on a frame sound, in each of one or more other equipment (120); receiving, in response to the first control message, a first CSI report message with the CSI from a first equipment of other equipment which is indicated in the first control message as the first responding with the CSI among the other equipment; the method CHARACTERIZED by: transmitting a second control message requesting a second CSI report message with the computed CSI to be transmitted from at least a second device from the other devices that is not indicated in the first control message as the first reply message with CSI among other equipment; and receiving a second CSI report message in response to the second control message, where the second CSI report message comprises a sequence number that matches a sequence number in the first control message, where the second CSI report message comprises at least one segment of the computed CSI and at least an indication of a number of remaining segments of the computed CSI to be transmitted from the second device.
    [0002]
    2. Method according to claim 1, characterized by the first control message comprising a null data packet announcement message, NDPA.
    [0003]
    3. Method according to claim 1, CHARACTERIZED by the second control message comprising a CSI query message.
    [0004]
    4. Method, according to claim 1, CHARACTERIZED for additionally comprising: transmitting another control message to the second equipment requesting another segment of the computed CSI to be transmitted; and receive the other requested segment from the computed CSI.
    [0005]
    5. Method, according to claim 1, CHARACTERIZED by a station formation field, STA, within the first control message comprising a STA identifier, ID, associated with each one or more equipment.
    [0006]
    6. Method according to claim 1, characterized by each of the first control message and second control message comprising at least one of: a frame control field, a duration field, a destination address field, DA, a source address field, AS, a control subtype field, a station information field, STA, or a cyclic redundancy check field, CRC.
    [0007]
    7. Method according to claim 6, CHARACTERIZED by the STA information field to comprise information about modulation-coding schemes used by the equipment for transmitting the first CSI report message and one or more CSI report messages.
    [0008]
    8. Method, according to claim 6, CHARACTERIZED that the DA field comprises a broadcast identifier, ID, associated with the one or more devices, the control subtype field indicates that the first control message comprises a packet advertisement null data, NDPA, dedicated to one or more devices identified by broadcast ID, and the method further comprising: transmitting the sound board immediately after the first control message with NDPA.
    [0009]
    9. Method, according to claim 1, CHARACTERIZED by further comprising: receiving the CSI computed with multiple MAC protocol data units, MPDUs, CSI segment MAC from an aggregated MAC protocol data unit, A-MPDU, in that each of the CSI segment MPDUs does not require confirmation to confirm successful receipt of that CSI segment MPDU.
    [0010]
    10. Method, according to claim 1, CHARACTERIZED by further comprising: receiving a segment of the CSI computed within the first CSI report message; transmit, in response to the segment, another control message to request another segment of the computed CSI, in which the other control message comprises an indication of a number of remaining segments of the computed CSI to be transmitted; and receive the other segment, in which the other segment was programmed for transmission based on the indication on the number of segments remaining.
    [0011]
    11. Method, according to claim 1, CHARACTERIZED for additionally comprising: receiving at least one confirmation frame, ACK, or a null CSI frame transmitted from one of the equipment confirming receipt of one or more second control messages, if the first control message was not received on that device, where the null CSI frame comprises at least one of a set of CSI sequence numbers for a sequence number from that second control message, an indication that the CSI requested to be computed on that device, a CSI feedback type field set to a standard value is not transmitted within the CSI null frame, or an indication that a number of segments in which the CSI null frame is transmitted is equal to one.
    [0012]
    12. Communications equipment, comprising: means for transmitting a first control message, to a plurality of other equipment, the first control message requesting that channel status information, CSI, be computed based on a sound board, in each of one or more other equipment; means for receiving, in response to the first control message, a first CSI report message with the CSI from a first equipment of other equipment which is indicated in the first control message as the first responding with the CSI among the other equipment; the equipment CHARACTERIZED by: the means to transmit be additionally configured to transmit a second control message requesting a second CSI report message with the computed CSI to be transmitted from at least a second equipment from the other equipment that is not indicated in the first control message as the message responding first with the CSI among the other equipment; and the means for receiving additionally configured to receive a second CSI report message in response to the second control message, wherein the second CSI report message comprises a sequence number that matches a sequence number in the first control message, wherein the second CSI report message comprises at least one segment of the computed CSI and at least an indication of a number of remaining segments of the computed CSI to be transmitted from the second device.
    [0013]
    13. Equipment according to claim 12, characterized by the first control message comprising a null data packet announcement message, NDPA.
    [0014]
    14. Equipment according to claim 12, CHARACTERIZED by the second control message comprising a CSI query message.
    [0015]
    15. Equipment, according to claim 12, CHARACTERIZED by: the means to transmit be configured to transmit another control message to the second equipment requesting another segment of the computed CSI to be transmitted; and the means to receive are also configured to receive the other requested segment of the computed CSI
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-05-05| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 1/00 , H04B 7/06 Ipc: H04B 7/06 (2006.01), H04L 1/00 (2006.01) |
    2020-05-05| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-02-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/07/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US36834810P| true| 2010-07-28|2010-07-28|
    US61368348|2010-07-28|
    US37254610P| true| 2010-08-11|2010-08-11|
    US61372546|2010-08-11|
    US13/179,651|US9337954B2|2010-07-28|2011-07-11|Protocol for channel state information feedback|
    US13179651|2011-07-11|
    PCT/US2011/045183|WO2012015737A1|2010-07-28|2011-07-25|Protocol for channel state information feedback|
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