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    • 专利摘要:
    IMPROVEMENTS TO THE MU-MIMO VHT PREAMBLE TO ENABLE TRANSMISSION MODE DETECTION Certain aspects of the present disclosure present a technique for enabling a receiver to detect the transmission mode of a signal based on a common GIS field (406) transmitted to all receivers . The proposed technique includes a frame structure in which information about the mode of transmission is transmitted in a first part of a GIS field (406) to all receivers.
    公开号:BR112012002958B1
    申请号:R112012002958-4
    申请日:2010-08-12
    公开日:2021-06-08
    发明作者:Sameer Vermani；Lin Yang；Hemanth Sampath；Vicent Knowles Jones Iv；Didier Johannes Richard Van Nee
    申请人:Qualcomm Incorporated；
    IPC主号:
    专利说明:

    [001] The present application claims priority to provisional patent application Serial No. 61/233 51 entitled "Enhancements to the MU-MIMO Downlink VHT Preamble to Enable Mode Detection", filed August 12, 2009; and to provisional patent application Serial No. 61/234,927 entitled "Enhancements to the MU-MIMO VHT Preamble to Enable Mode Detection", filed August 18, 2009; and assigned to the assignee hereof and expressly incorporated herein by reference. TECHNICAL FIELD
    [002] Certain aspects of the present disclosure relate generally to wireless communications and more specifically to detecting the mode of transmission of a signal at a receiver. FUNDAMENTALS
    [003] To solve the problem of increasing bandwidth requirements that are sought 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 simultaneous achievement of high data transmission capacities. Multiple Input Multiple Output (MIMO) technology represents such an approach that has recently emerged as a popular technique for next generation communication systems. MIMO technology has been adopted in several emerging wireless communication standards, such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. IEEE 802.11 denotes a set of Wireless Local Area Network (WLAN) air interface standards developed by the IEEE 802.11 committee for short-range communications (from tens of meters to a few hundred meters, for example).
    [004] A MIMO wireless system uses multiple (NT) transmit antennas and multiple (NR) receive antennas for data transmission. A MIMO channel formed by NT transmit antennas and NR receive antennas can be decomposed into NS spatial streams, where, for all practical purposes, NS < = min {NT, NR}. NS spatial streams can be used to transmit NS independent data streams in order to obtain greater total transmission capacity.
    [005] In wireless networks with a single access point and multiple stations, simultaneous transmissions can occur on several channels to different stations, both in the uplink direction and in the uplink direction. SUMMARY
    [006] Certain aspects of the present disclosure provide a method for wireless communications. The method generally includes receiving a first part of a signal field (SIG) of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatuses, and a second part, which is specific to each apparatus determines a frame structure transmission mode based on the first part of the SIG field and receives the remaining frame structure part based on the transmission mode.
    [007] Certain aspects of the present disclosure provide a method for wireless communications. The method generally includes generating a frame structure comprising a signal field (SIG), transmitting a first part of the SIG field of the frame structure, the first part being common to a plurality of apparatuses, wherein the mode Transmitting frame structure is detected based on the first part of the SIG field, and transmitting a second part of the SIG field of the frame structure, wherein the second part is specific to each of the plurality of apparatuses.
    [008] Certain aspects of the present disclosure provide an apparatus for wireless communications. The method generally includes a receiver configured to receive a first part of a signal field (SIG) of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatuses, and a second part, which is specific to each apparatus, a circuit configured to determine a frame structure transmission mode based on the first part of the SIG field, and wherein the receiver is also configured to receive the remaining part of the frame structure based on the mode of transmission.
    [009] Certain aspects of the present disclosure provide an apparatus for wireless communications. The method generally includes a circuit configured to generate a frame structure comprising a signal field (SIG), a transmitter configured to transmit a first part of the SIG field of the frame structure, the first part being common to a plurality of apparatus, wherein the frame structure transmission mode is detected based on the first part of the SIG field, and wherein the transmitter is also configured to transmit a second part of the frame structure SIG field, wherein the second part is specific to each of the plurality of devices.
    [0010] Certain aspects of the present disclosure provide an apparatus for wireless communications. The method generally includes means for receiving a first part of a signal field (SIG) of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatuses, and a second part, which is specific to each apparatus, means for determining a frame structure transmission mode based on the first part of the SIG field, and wherein the means for receiving is also configured to receive the remaining part of the frame structure based on the transmission mode .
    [0011] Certain aspects of the present disclosure provide an apparatus for wireless communications. The method generally includes means for generating a frame structure comprising a signal field (SIG), means for transmitting a first part of the SIG field of the frame structure, the first part being common to a plurality of apparatus, wherein the frame structure transmission mode is detected based on the first part of the SIG field, and wherein the means for transmitting is also configured to transmit a second part of the SIG field of the frame structure, wherein the second part is specific to each of the plurality of devices.
    [0012] Certain aspects of the present disclosure provide a computer program product for wireless communications, which comprises a computer-readable medium that comprises instructions. Instructions are executable to receive a first part of a signal field (SIG) of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatuses, and a second part, which is specific to each apparatus, to determine a frame structure transmission mode based on the first part of the SIG field and to receive the remaining part of the frame structure based on the transmission mode.
    [0013] Certain aspects of the present disclosure provide a computer program product for wireless communications, which comprises a computer-readable medium that comprises instructions. The instructions are executable to generate a frame structure comprising a signal field (SIG), to transmit a first part of the SIG field of the frame structure, the first part being common to a plurality of apparatuses, wherein the mode for transmitting the frame structure is detected based on the first part of the SIG field, and for transmitting a second part of the SIG field of the frame structure, wherein the second part is specific to each of the plurality of apparatuses.
    [0014] Certain aspects provide a station for wireless communications. The station generally includes at least one antenna, a receiver configured to receive, by means of the at least one antenna, a first part of a signal field (SIG) of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatus, and a second part, which is specific to each apparatus, a circuit configured to determine a frame structure transmission mode based on the first part of the SIG field, and in which the receiver is also configured to receive the remaining part of the frame structure based on the transmission mode.
    [0015] Certain aspects provide an access point for wireless communications. The access point generally includes a plurality of antennas, a circuit configured to generate a frame structure comprising a signal field (SIG), a transmitter configured to transmit, via the plurality of antennas, a first part of the field. GIS of the frame structure, wherein the first part is common to a plurality of apparatuses, wherein the frame structure transmission mode is detected based on the first part of the SIG field, and wherein the transmitter is also configured to transmit a second part of the SIG field of the frame structure, the second part being specific to each of the plurality of apparatuses. BRIEF DESCRIPTION OF THE DRAWINGS
    [0016] For a detailed understanding of the above-listed features of the present disclosure, a more specific description, briefly summarized above, may be given with reference to aspects, some of which are shown in the accompanying drawings. It should be noted, however, that the accompanying drawings show only certain typical aspects of this disclosure and, therefore, should not be considered as limiting its scope, as the description may admit other aspects that are equally effective.
    [0017] Figure 1 shows a diagram of a wireless communications network in accordance with certain aspects of the present disclosure.
    [0018] Figure 2 shows a block diagram of an exemplary access point and user terminals in accordance with certain aspects of the present disclosure.
    [0019] Figure 3 shows an exemplary wireless device block diagram in accordance with certain aspects of the present disclosure.
    [0020] Figures 4A and 4B show proposed frame structures for a downlink Multiple Input Multiple Output (MU-MIMO) system with very high transmission capacity (VHT), in accordance with certain aspects of the present disclosure.
    [0021] Figure 5 shows a proposed frame structure for a VHT uplink MU-MIMO system, in accordance with certain aspects of the present disclosure.
    [0022] Figure 6 shows exemplary operations for transmitting a frame suitable for mode detection, in accordance with certain aspects of the present disclosure.
    [0023] Figure 6A shows exemplary components capable of performing the operations shown in Figure 6.
    [0024] Figure 7 shows exemplary operations for detecting the mode of transmission of a received signal at a receiver, in accordance with certain aspects of the present disclosure.
    [0025] Figure 7A shows exemplary components capable of performing the operations shown in Figure 7. DETAILED DESCRIPTION
    [0026] Various aspects of certain aspects of the present disclosure are described below. It should be evident that the present teachings may be embodied in a wide variety of forms and that any specific structure, function, or both, which are disclosed herein, is merely representative. Based on the present teachings, those skilled in the art should understand that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus can be implemented or a method can be put into practice using any number of the aspects presented herein. Furthermore, such apparatus may be implemented or such method may be put into practice using another structure, functionality or structure and functionality in addition to the one or more other than one or more of the aspects presented herein. Furthermore, an aspect may comprise at least one element of a claim.
    [0027] The word "exemplary" is used herein to mean "which serves as an example, occurrence or illustration". Any aspect described herein as "exemplary" is not necessarily to be interpreted as preferred or advantageous compared to other aspects. Also as used herein, the term “legacy stations” refers generally to wireless network nodes that support the Institute of Electrical and Electronics Engineers (IEEE) 802.11n standard or earlier versions of the IEEE 802.11 standard.
    [0028] The multi-antenna transmission techniques described herein can be used in combination with various wireless technologies, such as Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiplexing (OFDM), Time Division Multiple Access (TDMA), Space Division Multiple Access (SDMA), and so on. Multiple user terminals can concurrently transmit/receive data via different (1) orthogonal code channels for CDMA, (2) time slices or (3) subbands for OFDM. A CDMA system can implement IS-2000, IS-95, IS-856, Wideband CDMA (W-CDMA), or some other standards. An OFDM system can implement IEEE 802.11 or some other standards. A TDMA system can implement GSM or some other standards. These various patterns are known in the art. AN EXEMPLARY MIMO SYSTEM
    [0029] Figure 1 shows a multiple-access MIMO system 100 with access points and user terminals. For simplicity, only one access point 110 is shown in Figure 1. An access point (AP) is generally a fixed station that communicates with user terminals and may also be referred to as a base station or some other terminology. A user terminal may be fixed or mobile and may also be referred to as a mobile station, station (STA), client, wireless device or some other terminology. A user terminal can be a wireless device such as a cell phone, a personal digital assistant (PDA), a handheld device, a wireless modem, a laptop computer, a personal computer, and so on.
    [0030] The access point 110 can communicate with one or more user terminals 120 at any given time on the downlink and uplink. The downlink (ie, forward link) is the communication link between the access point and the user terminals, and the uplink (ie, Reverse link) is the communication link between the user terminals and the access point. A user terminal can communicate peer-to-peer with another user terminal. A system controller 130 couples to and provides coordination and control for the access points.
    [0031] The system 100 uses several transmit antennas and several receive antennas for data transmission in the downlink and in the uplink. Access point 110 is equipped with multiple Nap antennas and represents multiple inputs (MI) for downlink transmissions and multiple outputs (MO) for uplink transmissions. A Nu set of selected 120 user terminals collectively represent the multiple outputs for downlink transmissions and the multiple inputs for uplink transmissions. In certain cases, it may be desirable to have Nap > Nu > 1 if the data symbol streams to the Nu user terminals are not multiplexed into code, frequency, or time by some means. Nu can be larger than Nap if data symbol streams can be multiplexed using different code channels with CDMA, disjointed sets of subbands with OFDM, and so on. Each selected user terminal transmits user specific data and/or receives user specific data from the access point. In general, each selected user terminal can be equipped with one or several antennas (ie Nut > 1). Selected Nu user terminals can have the same or different number of antennas.
    [0032] The MIMO system 100 can be a time division duplex (TDD) system or a frequency division duplex (FDD) system. For a TDD system, the downlink and uplink share the same frequency band. For an FDD system, the downlink and uplink use different frequency bands. MIMO system 100 may 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 several antennas (in case the additional cost can be borne, for example).
    [0033] Figure 2 shows a block diagram of the access point 110 and of two 120m and 120x user terminals in the MIMO 100 system. The access point 110 is equipped with Nap antennas 224a to 224ap. The 120m user terminal is equipped with Nut,m 352ma to 252mu antennas, and the 120x user terminal is equipped with Nut,x 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 an independently powered apparatus or device capable of transmitting data over a frequency channel and a "receiving entity" is an independently powered apparatus or device capable of receiving data via of a frequency channel. In the following description, the subscript "dn" denotes the downlink, the subscript "up" denotes the uplink, Nup user terminals are selected for simultaneous transmission on the uplink, Ndn user terminals are selected for simultaneous transmission on the downlink, Nup can or can not equal to Nup and Nup and Ndn can be static values or can change for each schedule interval. Beam steering or some other spatial processing technique can be used at the access point and at the user terminal.
    [0034] In the uplink, at each user terminal 120 selected for transmission on the uplink, a 288 TX data processor receives traffic data from a 286 data source and control data from a 280 controller. The 288 TX data processor processes (encodes, interleaves and modulates, for example) the traffic data {dup,m} for the user terminal based on the coding and modulation schemes associated with the selected rate for the user terminal and generates a stream of data symbols { Supp.m}. A spatial processor TX 290 performs spatial processing on the data symbol stream {Sup,m} and generates Nut,m transmission symbol streams for the Nut,m antennas. Each transmitter unit (TMTR) 254 receives and processes (converts to analog, amplifies, filters and converts to higher frequency, for example) a respective stream of transmission symbols so as to generate an uplink signal. Nut,transmitting units 254 generate Nut,m uplink signals for transmission from Nut,m antennas 252 to the access point110.
    [0035] Multiple Nup user terminals can be programmed for simultaneous transmission on the uplink. Each of these user terminals performs spatial processing on its data symbol stream and transmits its set of transmit symbol streams on the uplink to the access point.
    [0036] At access point 110, Nap antennas 224a through 224ap receive the uplink signals from all User Nupterminals transmitting on the uplink. Each antenna 224 sends a received signal to a respective receiver unit (RCVR) 222. Each receiver unit 222 performs complementary processing to that performed by the transmitter unit 254 and generates a received symbol stream. An RX space processor 240 performs receiver spatial processing on the Nap symbol streams received from the receiver Nappunities 222 and generates Nup retrieved uplink data symbol streams. Receiver spatial processing is performed in accordance with channel correlation matrix inversion (CCMI), minimum mean square error (MMSE), successive interference cancellation (SIC), or some other technique. Each retrieved uplink data symbol stream {Sup,m} is an estimate of a data symbol stream {Sup,m} transmitted by a respective user terminal. An RX 242 data processor processes (demodulates, deinterleaves and decodes, for example) each retrieved uplink data symbol stream {Sup,m} according to the rate used for that stream, so as to obtain decoded data. The decoded data for each user terminal can be sent to a data warehouse 244 for storage and/or a controller 230 for further processing.
    [0037] On the downlink, at the access point 110, a TX data processor 210 receives traffic data from a data source 208 to Ndn user terminals programmed for transmission on the downlink, control data from a controller 230 and possibly other data of a programmer 234. Different types of data can be sent on different transport channels. Data processor TX 210 processes (encodes, interleaves and modulates, for example) the traffic data for each user terminal based on the rate selected for that user terminal. The TX data processor 210 generates Ndn downlink data symbol streams to the Ndn user terminals. A space processor TX 220 performs spatial processing on the Ndn downlink data symbol streams and generates Nap transmit symbol streams for the Nap antennas. Each transmitter unit (TMTR) 222 receives and processes a respective stream of transmission symbols so as to generate a downlink signal. Nap transmitting units 222 generate Nap downlink signals for transmission from Nap antennas 224 to user terminals.
    [0038] At each user terminal 120, the Nut,m antennas 252 receive the Nap downlink signals from the access point 110. Each receiver unit (RCVR) 254 processes a signal received from a connected antenna 252 and generates a symbol stream. Received. An RX spatial processor 260 performs receiver spatial processing in Nut, on symbol streams received from Nut, in receiver units 254 and generates a retrieved downlink data symbol stream {Sdn,m} to the user terminal. Receiver spatial processing is performed according to CCMI, MMSE, or some other technique. An RX data processor 270 processes (demodulates, deinterleaves and decodes, for example) the downlink data symbol stream so as to obtain decoded data for the user terminal.
    [0039] At each user terminal 120, asNut,m antennas 252 receive the Nap downlink signals from the access point 110. Each receiving unit (RCVR) 254 processes a signal received from a connected antenna 252 and generates a received symbol stream. . An RX spatial processor 260 performs receiver spatial processing in Nut, on symbol streams received from Nut, in receiver units 254 and generates a retrieved downlink data symbol stream {Sdn,m} to the user terminal. Receiver spatial processing is performed according to CCMI, MMSE, or some other technique. An RX data processor 270 processes (demodulates, de-interleaves and decodes, for example) the retrieved downlink data symbol stream so as to obtain decoded data for the user terminal.
    [0040] Figure 3 shows various components that can be used in a wireless device 302, which can be used within system 100. The wireless device 302 is an example of a device that can be configured to implement the various methods described herein. . Wireless device 302 can be an access point 110 or a user terminal 120.
    [0041] Wireless device 302 may include a processor 304, which controls the operation of wireless device 302. Processor 304 may also be referred to as a central processing unit (CPU). Memory 306, which may include both read-only memory (ROM) and random access memory (RAM), provides instructions and data for processor 304. A portion of memory 306 may 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 are executable to implement the methods described herein.
    [0042] The wireless device 302 may also include a housing 308, which may include a transmitter 310 and a receiver 312 to enable transmission and reception of data between the wireless device 302 and a remote location. Transmitter 310 and receiver 312 can be combined into a transceiver 314. A plurality of transmit antennas 316 can be secured to housing 308 and electrically coupled to transceiver 314. Wireless device 302 can also include multiple transmitters, multiple receivers, and multiple receivers transceivers.
    [0043] Wireless device 302 may also include a signal detector 318, which may be used in an effort to detect and quantify the level of signals received by transceiver 314. Signal detector 318 may detect signals such as total energy, energy per sub-carrier per symbol, power spectral density and other signals. Wireless device 302 may also include a digital signal processor (DSP) 320 for use in signal processing.
    [0044] 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.
    [0045] Those skilled in the art will recognize that the techniques described herein can be generally applied in systems using any type of multiple access scheme, such as SDMA, OFDMA, CDMA and combinations thereof.
    [0046] IMPROVEMENTS IN THE PREAMBLE VHT MU- MIMO TO ENABLE MODE DETECTION Certain aspects of the present disclosure provide techniques for detecting the mode of transmission of a signal at a receiver. For example, a transmitter can transmit signals using different standards, such as the IEEE 802.11nla/ac standards. A receiver must be able to detect the transmission mode (ie, the pattern used in transmission) of a signal in order to be able to process the signal correctly. In both uplink and downlink SDMA, information about the transmission mode of a signal can be included in the preamble of each frame to be used in receivers.
    [0047] Figures 4A and 4B show proposed frame structures for a downlink Multiple Input Multiple Output (MU-MIMO) system with very high transmission capacity (VHT), in accordance with certain aspects of the present disclosure.
    [0048] As shown in Figure 4A, the preamble fields in a frame structure, such as the short training field (L-STF), the long training field (L-LTF), the signal (L-SIG) , the high transmission capacity signal (HT-SIG1) and the HT-SIG2 404 are common to all users and therefore not shaped by beams. The short training field with high transmission capacity (VHT-STF) 408 is the first field in the frame that is formed by beams. Furthermore, the rest of the fields in the frame that are transmitted after the VHT-STF field are also shaped by beams for specific users.
    [0049] For certain aspects of the present disclosure, the STF field can be used to adjust an automatic gain control (AGC) setting. For a station to process a VHT-STF 408 field correctly, the station must know the transmission mode or standard (IEEE 802.11n, IEEE 802.11ac or IEEE 802.11a) that is used in the transmission.
    [0050] Information about the signal transmission mode can be included in the signal field with very high transmission capacity (VHT-SIG). The VHT-SIG field can be divided into two parts. For certain aspects, each of the first and second parts of the VHT-SIG field can span one or more OFDM symbols.
    [0051] The first part 406 of the VHT-SIG field can be common to all users and not shaped by bundles. This part can arrive, after HT-SIG2 404, in a downlink frame in order to notify the receiving stations of the transmission mode.
    [0052] The second part 412 of the VHT-SIG field can be specific to each STA and, consequently, shaped by bundles. For certain aspects, as shown in Figure 4A, the second part 412 of the VHT-SIG field can be transmitted after the first long training field (LTF) to all stations. For certain aspects, as shown in Figure 4B, the second part 412 of the VHT-SIG field can be transmitted to stations after all long training fields have been transmitted.
    [0053] Figure 4B shows a proposed frame structure for a very high transmission capacity (VHT) downlink MU-MIMO system, in accordance with certain aspects of the present disclosure. In this figure, most fields are similar to those in Figure 4A. The only difference between Figures 4A and 4B is the location of the second part 412 of the VHT-SIG field. In Figure 4B, the second part 412 of the VHT-SIG field is transmitted after all long training fields assigned to that station.
    [0054] As shown in Figures 4A and 4B, unique spatial streams are assigned to users 1 to 4. Therefore, each user receives a single LTF 410 field after receiving the VHT-STF 408 field. On the other hand, four spatial streams are assigned to user 5 and therefore user 5 receives four LTF 410 fields, one of them corresponding to each of the spatial flows. For certain aspects of the present disclosure, at least one LTF can be used to estimate the channel for spatial flow at the receiver.
    [0055] According to certain aspects, a "training sequence" can occur, in which the AP is able to obtain "signatures" for each of the stations. The AP can use these signatures to perform beam shaping so that each station can recognize its corresponding second part of the VHT-SIG field.
    [0056] For certain aspects of the present disclosure, in downlink SDMA, the first part of the VHT-SIG field that is received after the VHT-LFT1 field may indicate the number of remaining LTF fields and the modulation and encoding scheme (MCS) used in transmission. In the uplink SMDA, the VHT-SIG field can be received after all LTF fields in order to indicate the MCS used in the uplink transmission to the access point.
    [0057] In both uplink and downlink SDMA, the first part of the VHT-SIG field is received before the reception of the VHT-STF field. Therefore, the receiver decodes the VHT-SIG field and detects the transmission mode (ie IEEE 802.11ac/a/n) before receiving the VHT-STF field. Consequently, at the time of the beginning of the VHT-STF 406 field, a station knows if the transmission mode complies with the IEEE 802.11ac standard. IEEE 802.11a or IEEE 802.11n.
    [0058] Figure 5 shows a proposed frame structure for an uplink MU-MIMO system with very high transmission capacity (VHT), in accordance with certain aspects of the present disclosure. In this frame structure, similar to the downlink, the first part 406 of the VHT-SIG field is transmitted after the HT-SIG2 field 404. The second part 412 of the VHT-SIG field is transmitted after all LTFs are transmitted (so similar to Figure 4B). The rest of the fields in this frame structure are similar to the downlink frames shown in Figures 4A and 4B.
    [0059] For certain aspects of the present disclosure, a unified frame structure for uplink and downlink can be used to allow the receiver to detect the transmission mode (i.e., IEEE 802.11n/a/ac). The unified frame structure (as shown in Figures 4B and 5) can include a VHT-SIG field that is divided into two parts. The first part of the VHT-SIG field can be common to all users, and the second part of the VHT-SIG field can be specific to each user. For certain aspects, for an uplink-downlink frame structure, the second part of the VHT-SIG field can be transmitted after all the VHT-LTF fields to allow for uniformity between uplink and downlink.
    [0060] For certain aspects of the present disclosure, in a system that uses a unified frame structure for both uplink and downlink, stations that receive a frame on the downlink can perform auto-detection to determine whether the symbol after the VHT- field LTF 1 is the second part of the VHT-SIG field or an LTF field. The station can use one of the existing HT-SIG detection algorithms for this purpose. Therefore, no additional hardware may be needed. By detecting the second part of the VHT-SIG field, the station knows that all long training fields are received and is able to count the number of different LTF fields assigned to the station.
    [0061] For certain aspects, the first part of the VHT-SIG field can also provide receivers using the IEEE 802.11ac standard with information about the transmission mode (DL-SDMA, UL-SDMA or MIMO 802.11ac, for example), bandwidth (20/40/80 MHz, for example) and other common parameters such as total transmission length, use of delimiter or zero padding, maximum number of LTFs or the longest MU-MIMO transmission time among all spatial flows and other parameters. The total transmission length may already have been included in the HT-SIG field, but a separate length may be needed if receivers using IEEE 802.11n and receivers using IEEE 802.11ac are fooled for different durations.
    [0062] After receiving the first part of the VHT-SIG field, a station can detect the transmission mode using the first part of the VHT-SIG field. For certain aspects, the station may use a spatial constellation (rotated binary phase shift keying (BPSK), for example) for mode detection. For example, information about the transmission mode can be transmitted on a geometric axis orthogonal to the constellation used in the transmission of the VHT-SIG field.
    [0063] Figure 6 shows exemplary operations 600 for transmitting a frame suitable for mode detection, in accordance with certain aspects of the present disclosure. At 602, the transmitter generates a frame structure comprising a signal field (SIG). At 604, the transmitter transmits a first part of the SIG field of the frame structure, where the first part is common to a plurality of users and the transmission mode of the frame structure is detected based on the first part of the SIG field. At 606, the transmitter can transmit an STF to the plurality of users using Multi-user beamshaping, where the STF is transmitted after the first part of the SIG field.
    [0064] In 608, the transmitter can transmit LTFs of the frame structure using beamshaping for Multiuser. At 610, the transmitter transmits a second part of the SIG field of the frame structure, the second part being specific to each of the plurality of users. The second part of the GIS field can be bundled for each user and can be transmitted after the LTFs.
    [0065] For certain aspects, the second part of the GIS field may comprise an MCS and a transmission length for each user. Furthermore, the second part of the GIS field can be transmitted using a single spatial stream MCS.
    [0066] Figure 7 shows exemplary operations 700 for detecting the mode of transmission of a received signal at a receiver, in accordance with certain aspects of the present disclosure. At 702, a receiver receives a first part of a signal field of a frame structure, the SIG field comprising the first part, which is common to a plurality of apparatus, and a second part, which is specific to each apparatus. At 704, the receiver determines the frame structure transmission mode based on the first part of the SIG field, where the transmission mode conforms to at least one of the IEEE 802.11ac/n/a standards. At 706, the receiver receives the remaining part of the frame structure based on the transmission mode. The transmission mode can comprise IEEE 802.11ac/a/n standards.
    [0067] Certain aspects of the present disclosure propose techniques for including information about the mode of transmission of a signal in the preamble of a frame so that receivers can detect the mode of transmission and correctly process the received signals.
    [0068] The various operations of the methods described above may be performed by any suitable means capable of performing the corresponding functions. The means can include various hardware and/or software components and/or modules, which include, but are not limited to, a circuit, application-specific integrated circuit (ASIC) or processor. Generally, in case there are operations shown in the figures, these operations may have corresponding means plus function components with similar numbering. For example, blocks 602-610 of Figure 6 correspond to circuit blocks 602A-610 shown in Figure 6A. In addition, the 702-706 blocks of Figure 7 correspond to the 702A-706 circuit blocks shown in Figure 7A.
    [0069] For certain aspects, means for receiving comprises a receiver, means for transmitting comprises a transmitter and means for determining the mode of transmission comprises a circuit configured to determine the mode of transmission of the signal.
    [0070] The various operations of the methods described above can be performed by any suitable means 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 means capable of performing the operations.
    [0071] As used herein, the term "determine" encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, fetching (searching a table, a database or other data structure, for example), checking, and the like. Furthermore, “determining” can include receiving (receiving information, for example), accessing (accessing data in a memory, for example) and the like. "Determining" may also include solving, selecting, choosing, establishing, and the like.
    [0072] As used herein, the phrase "at least one of A or B" is intended to include any combination of A and B. In other words, "at least one of A or B" comprises the following set : [A], [B] and [A, B].
    [0073] The various illustrative logic blocks, modules and circuits described in connection with the present disclosure may 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 gates (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but alternatively the processor can be any commercially obtainable processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, such as, for example, a combination of DSP and microprocessor, a plurality of microprocessors, one or more microprocessors together with a DSP core, or any other such configuration.
    [0074] The method or algorithm steps described in connection with the present disclosure may 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 memory (RAM), 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 several different code segments, among different programs, and across multiple storage stores. A storage medium may 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 integral with the processor.
    [0075] The methods disclosed herein comprise one or more steps or actions to achieve the described method. The method steps and/or actions can be interchanged without abandoning the scope of the claims. In other words, even if a specific order of steps or actions is specified, the order and/or use of specific steps and/or actions can be modified without abandoning the scope of the claims.
    [0076] The described functions can be implemented in hardware, software, firmware or any combination of them. If implemented in software, functions can be stored as one or more instructions on a computer-readable medium. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer readable medium may comprise a RAM, ROM, EEPROM, CD-ROM or other optical disk storage device, magnetic disk storage or other magnetic storage device or any another means that can be used to carry or store the desired program code in the form of instructions or data structures and that can be accessed by a computer. Disc (disk and disc in the original), as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray® disc, where discs (disks) usually play back data magnetically, while discs (discs) reproduce data optically with lasers.
    [0077] Thus, certain aspects may comprise a computer program product to perform the operations presented here. For example, such computer program product may comprise a computer readable medium which has instructions stored (and/or encoded) therein, the instructions being executable by one or more processors to perform the operations described herein. For certain aspects, the computer program product can include packaging material.
    [0078] Software or instructions may also be transmitted via a transmission medium. For example, if the software is streamed from a website, a server, or other remote source that uses coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio or microwave are included in the definition of transmission medium .
    [0079] Furthermore, it should be understood that appropriate modules and/or means to perform the methods and techniques described herein may 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 in order to facilitate the transfer of media to perform the methods described herein. Alternatively, various methods described herein can be provided by means of storage media (such as, for example, RAM, ROM, a physical storage medium such as a compact disk (CD) or floppy disk, etc.) so that a user terminal and/or a base station can achieve the various methods by attaching or supplying the storage media to the device. Furthermore, any other suitable technique can be used to perform the methods and techniques described herein on a device.
    [0080] It is to be understood that the claims are not limited to the precise configuration and components shown above. Various modifications, alterations and variations can be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.
    [0081] The techniques presented here can be used in several applications. For certain aspects, the techniques presented here can be incorporated into an access point station, an access terminal, a mobile telephone device, or other type of wireless device with logic and processing elements to perform the techniques presented here.
    [0082] Although the foregoing relates to aspects of the present disclosure, other aspects of the disclosure can be conceived without departing from its basic scope, and its scope is determined by the claims set forth below.
    权利要求:
    Claims (19)
    [0001]
    1. Method for wireless communications, comprising: receiving a first part of a signal field, SIG, of a frame structure, the SIG field comprising the first part that is common to a plurality of apparatuses and a second part that is specific of each apparatus; determining a frame structure transmission mode based on the first part of the SIG field; and receive remaining part of the frame structure based on transmission mode; characterized by the fact that transmission mode information is received on an axis orthogonal to a constellation used in receiving the GIS field.
    [0002]
    2. Method according to claim 1, characterized in that it further comprises: interpreting one or more bits in the first part of the GIS field based on the transmission mode; and/or that the first part of the GIS field indicates a number of training fields along the frame structure.
    [0003]
    3. Method according to claim 1, characterized in that receiving the remaining part of the frame structure comprises: receiving one or more long training fields of the frame structure; ereceive the second part of the GIS field; and further comprising: identifying a number of the long training fields by counting the number of long training fields received prior to receiving the second part of the SIG field; and/or further comprising: estimating at least one channel for a plurality of spatial flows by utilizing the long training grounds.
    [0004]
    4. Method according to claim 1, characterized in that it further comprises: establishing an automatic gain control, AGC, based on the transmission mode.
    [0005]
    5. Method according to claim 1, characterized in that the transmission mode complies with at least one of the 802.11 standards of the Institute of Electrical and Electronics Engineers (IEEE).
    [0006]
    6. Method according to claim 1, characterized in that the first or second part of the SIG field comprises at least one orthogonal frequency division multiplexing symbol, OFDM.
    [0007]
    7. Method for wireless communications, comprising: generating a frame structure comprising a signal field, SIG; transmitting a first part of the SIG field of the frame structure, wherein the first part is common to a plurality of apparatus, in that a frame structure transmission mode is detectable based on the first part of the SIG field; transmitting a second part of the SIG field of the frame structure, wherein the second part is specific to each of the plurality of apparatuses, characterized by fact that transmission mode information is transmitted on an orthogonal axis to a constellation used in transmitting the GIS field.
    [0008]
    8. Method according to claim 7, characterized in that transmitting the second part of the SIG field comprises shaping the second part with beams for the plurality of apparatuses; and further comprising: performing training to obtain subscriptions for the plurality of apparatus to be used in the shaping of beams.
    [0009]
    9. Method according to claim 7, characterized in that it further comprises: transmitting long training camps, LTFs, from the frame structure; etransmit the second part of the GIS field after transmitting the LTFs; and where the transmission of the second part of the GIS field indicates that the transmission of the long training fields is over.
    [0010]
    10. Method according to claim 7, characterized in that the second part of the GIS field is transmitted after a long training field, LTF; and/or further comprising: transmitting a short training field, STF, to the plurality of devices, where the STF is transmitted after the first part of the SIG field, and where the STF is usable by the devices to adjust the control setting of automatic gain, AGC, for each device.
    [0011]
    11. Method according to claim 7, characterized in that the second part of the GIS field indicates a number of long training fields that follow the second part of the GIS field; and/or that the first part of the GIS field indicates a number of long training fields; and/or that the first part of the GIS field comprises information about at least one of transmission bandwidth, a modulation and coding scheme, or a length of transmission by multiple-inputs-multiuser-outputs, MU-MIMO, longer between all spatial flows.
    [0012]
    12. Method according to claim 7, characterized in that the second part of the GIS field comprises at least one of a modulation and coding scheme, MCS, or a transmission length for each of the devices; and/or that the second part of the SIG field is transmitted using a single spatial stream modulation and coding scheme, MCS; and/or further comprising: transmitting a plurality of symbols to the apparatus using multi-user beamshaping, wherein the symbols are transmitted after the first part of the SIG field.
    [0013]
    13. Method according to claim 7, characterized in that the first or second part of the SIG field comprises at least one orthogonal frequency division multiplexing symbol, OFDM.
    [0014]
    14. Apparatus for wireless communications, comprising: means for receiving a first part of a signal field, SIG, of a frame structure, the SIG field comprising the first part which is common to a plurality of apparatus and a second part which is specific to each apparatus; means for determining a frame structure transmission mode based on the first part of the SIG field; the means for receiving is further configured to receive remaining part of the frame structure based on the transmission mode; fact that the means for receiving is further configured to receive transmission mode information on an axis orthogonal to a constellation used in receiving the SIG field.
    [0015]
    15. Apparatus according to claim 14, characterized in that the transmission mode complies with at least one of the 802.11 standards of the Institute of Electrical and Electronics Engineers (IEEE).
    [0016]
    16. Apparatus according to claim 14 characterized in that the first or second part of the SIG field comprises at least one orthogonal frequency division multiplexing symbol, OFDM.
    [0017]
    17. Apparatus for wireless communications, comprising: means for generating a frame structure comprising a signal field, SIG; means for transmitting a first part of the SIG field of the frame structure, wherein the first part is common to a plurality of apparatus, wherein a frame structure transmission mode is detectable based on the first part of the SIG field; wherein the means for transmitting is further configured to transmit a second part of the SIG field of the frame structure, wherein the second part is specific to each among the plurality of apparatus, characterized by the fact that the means for transmitting are further configured to transmit transmission mode information about an orthogonal axis to a constellation used in transmitting the GIS field.
    [0018]
    18. Apparatus according to claim 17, characterized in that the first or second part of the SIG field comprises at least one orthogonal frequency division multiplexing symbol, OFDM.
    [0019]
    19. Computer-readable memory, characterized in that it contains recorded thereon the method as defined in any one of claims 1 to 6 or 7 to 13.
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    同族专利:
    公开号 | 公开日
    US20110188482A1|2011-08-04|
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    BR112012002958A2|2016-04-12|
    WO2011019968A1|2011-02-17|
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    CN105721369B|2019-03-29|
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    TWI458303B|2014-10-21|
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    HK1170869A1|2013-03-08|
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    ES2577119T3|2016-07-13|
    DK2465238T3|2014-05-26|
    EP2465238B1|2014-03-19|
    KR20120049911A|2012-05-17|
    CN102474492B|2016-03-02|
    JP2013502173A|2013-01-17|
    KR101330115B1|2013-11-18|
    US9503932B2|2016-11-22|
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    CN102474492A|2012-05-23|
    EP2747359B1|2016-04-20|
    EP2747359A1|2014-06-25|
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    ES2458924T3|2014-05-07|
    EP2465238A1|2012-06-20|
    TW201119307A|2011-06-01|
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    法律状态:
    2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-03-10| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 27/26 , H04L 1/00 , H04L 27/00 , H04W 72/12 , H04L 27/34 Ipc: H04L 27/26 (2006.01), H04L 27/34 (2006.01), H04W 7 |
    2020-03-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-08| 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 12/08/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |
    优先权:
    申请号 | 申请日 | 专利标题
    US23345109P| true| 2009-08-12|2009-08-12|
    US61/233,451|2009-08-12|
    US23492709P| true| 2009-08-18|2009-08-18|
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    US12/848,058|US9503931B2|2009-08-12|2010-07-30|Enhancements to the MU-MIMO VHT preamble to enable mode detection|
    US12/848,058|2010-07-30|
    PCT/US2010/045389|WO2011019968A1|2009-08-12|2010-08-12|Enhancements to the mu-mimo vht preamble to enable transmission mode detection|
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