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WO2017193818A1 - 无线帧的发送与接收方法与装置 - Google Patents

无线帧的发送与接收方法与装置 Download PDF

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Publication number
WO2017193818A1
WO2017193818A1 PCT/CN2017/082167 CN2017082167W WO2017193818A1 WO 2017193818 A1 WO2017193818 A1 WO 2017193818A1 CN 2017082167 W CN2017082167 W CN 2017082167W WO 2017193818 A1 WO2017193818 A1 WO 2017193818A1
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bit
value
site information
frame
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PCT/CN2017/082167
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English (en)
French (fr)
Inventor
郭宇宸
于健
杨讯
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=60266357&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2017193818(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to MYPI2018704208A priority Critical patent/MY201372A/en
Priority to EP23172737.1A priority patent/EP4243310B1/en
Priority to PL17795436T priority patent/PL3407518T3/pl
Priority to KR1020187035506A priority patent/KR102209419B1/ko
Priority to CA3023848A priority patent/CA3023848C/en
Priority to EP20163476.3A priority patent/EP3761541B1/en
Priority to JP2018559385A priority patent/JP6692927B2/ja
Priority to MX2018013821A priority patent/MX386114B/es
Priority to AU2017262875A priority patent/AU2017262875B2/en
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to RU2018143349A priority patent/RU2712122C1/ru
Priority to BR112018073044-0A priority patent/BR112018073044B1/pt
Priority to ES17795436T priority patent/ES2814551T3/es
Priority to EP25157590.8A priority patent/EP4580096A3/en
Priority to EP17795436.9A priority patent/EP3407518B1/en
Publication of WO2017193818A1 publication Critical patent/WO2017193818A1/zh
Priority to US16/186,095 priority patent/US10924227B2/en
Anticipated expiration legal-status Critical
Priority to ZA2018/07813A priority patent/ZA201807813B/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0075—Transmission of coding parameters to receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for transmitting and receiving a radio frame.
  • OFDM Orthogonal Frequency Division Multiplexing
  • LTE Long Term Evolution
  • WiMAX Wireless Fidelity
  • WiFi Wireless Fidelity
  • OFDM is further applied to fixed network transmission, such as optical fiber, copper stranded wire, cable and other transmission methods.
  • the basic principle of OFDM is to reduce the subcarrier spacing to a minimum within the range allowed by the orthogonality of subcarriers. This aspect can ensure the formation of multiple parallel and non-interfering paths, and at the same time improve the frequency utilization efficiency of the system. .
  • OFDM has the above characteristics, if sub-carriers that do not interfere with each other of OFDM are allocated to a plurality of users, OFDM can be used to implement multi-user access or data transmission.
  • This is OFDMA (Orthogonal Frequency Division Multiple Access).
  • the transmitting data in the OFDMA mode is that the transmitting end sends data of multiple receiving ends to the receiving end associated with the subcarrier/subchannel through respective corresponding subcarriers/subchannels.
  • the transmission mode of the OFDMA requires synchronous transmission of data on the subcarrier/subchannel, and data of each user is orthogonally maintained by the respective subcarriers/subchannels at the time of synchronous transmission.
  • OFDMA can flexibly and conveniently schedule multiple users to transmit at the same time, it is beneficial to realize multi-user diversity by using OFDMA.
  • OFDMA can conveniently support multiple discrete sub-channels, so OFDMA can more effectively utilize blank frequency bands.
  • MU-MIMO Multiple User-Multiple Input Multiple Output
  • the transmitter downlink, DL MU-MIMO
  • the receiver uplink, UL MU-MIMIO
  • the transmitting end uses channel state information (CSI) to form a transmitting beam, and the transmitting end distinguishes multiple spatial streams; and UL MU-MIMO requires the receiving end to form using channel state information.
  • CSI channel state information
  • the receiving beam distinguishes the multi-path spatial stream at the receiving end.
  • the transmitting end in order to enable the transmitting end to acquire channel state information, the transmitting end needs to send a training sequence so that multiple receiving ends estimate the channel, and feed back the estimated channel state information to the transmitting end.
  • the WLAN Wireless LAN
  • the WLAN Wireless LAN
  • the WLAN Wireless LAN
  • the WLAN wireless LAN
  • a frame structure is required to make full use of the characteristics of OFDMA and efficient transmission.
  • the embodiment of the invention provides a method for transmitting a wireless frame, which is used to solve the defects in the prior art and improve the efficiency of wireless frame communication.
  • a method for transmitting a radio frame includes:
  • the sending end generates a radio frame, where the radio frame includes: one or more station information fields STA info field, and each station information field has a length of 2K bytes, where K is a natural number, for example, 1, 2, 3, ..., each site information
  • K is a natural number, for example, 1, 2, 3, ..., each site information
  • a method for receiving a radio frame including:
  • the radio frame is parsed and processed according to the value of the bit B16j+11.
  • a method of receiving a radio frame includes:
  • the radio frame includes: one or more site information fields STA info field, each site information field has a length of 2K bytes, where K is a natural number, for example, 1, 2, 3, ..., in each site information field
  • K is a natural number, for example, 1, 2, 3, ..., in each site information field
  • the radio frame is parsed and processed according to the value of the bit B16j.
  • Embodiments of the present invention also provide apparatus for performing the aforementioned methods, such as a chip or a station, an access point.
  • FIG. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 2 is a simplified schematic diagram of a flow of multi-user channel state information feedback
  • FIG. 3 is a simplified schematic diagram of a format of an NDPA frame
  • 4 is a simplified schematic diagram of a transmission flow of uplink OFDMA/MU-MIMO
  • Figure 5-9 is a simplified schematic diagram of a format of a preferred NDPA frame, respectively;
  • FIG. 10 is a simplified schematic diagram of a format of a preferred trigger frame
  • 11-12 are simplified schematic views of a device for implementing an embodiment of the present invention, respectively.
  • FIG. 1 it is a simple structural diagram of a wireless local area network WLAN, including an access station or access point 101, and one or more stations 102.
  • FIG. 2 it is a simplified schematic diagram of a flow of multi-user channel state information feedback.
  • the AP continuously sends NDPA (Null Data Packet Announcement) and NDP (Null Data Packet), and the receiving end estimates channel state information according to the indication of the NDPA and the LTF (Long Training Field) of the NDP. And generating a beamforming report frame (Beamforming Report, BF Report), and feeding back the estimated channel state information to the AP (Access Point, access point).
  • NDPA Null Data Packet Announcement
  • NDP Null Data Packet
  • the AP sends a beamforming report polling frame (BF Report Poll) to query the STAs (Stations) indicated in the NDPA one by one, and requests the BF Report from these STAs.
  • BF Report Poll a beamforming report polling frame
  • This method of asking one by one will bring a lot of overhead.
  • the format of an existing NDPA frame is as shown in FIG.
  • FIG. 4 it is a simple schematic diagram of a transmission flow of uplink OFDMA/MU-MIMO, in which UL OFDMA is introduced to realize parallel transmission of multiple users BF Report.
  • UL OFDMA needs to use a Trigger Frame to implement information such as synchronization and uplink resource allocation.
  • the characteristics of OFDMA are introduced, and the STA needs to measure part of the channel information in the entire bandwidth. Therefore, the AP needs to indicate the bandwidth information that the STA needs to measure in the NDPA frame. This part of the information needs extra bits to indicate, and the user information part of the current VHT NDPA frame has only 16 bits, and all of them carry useful information. Therefore, in 802.11ax, a radio frame (for example, HE NDPA frame) conforming to the 802.11ax standard is required to utilize the characteristics of OFDMA for efficient transmission.
  • a radio frame for example, HE NDPA frame
  • An embodiment of the present invention provides a method for transmitting a radio frame, including:
  • the highest bit of the station information field is located on the right side.
  • the highest bit of the station information field may also be located on the left side.
  • a method for transmitting a radio frame including
  • the sender generates a radio frame, and the radio frame includes:
  • the radio frame is an NDPA frame or a trigger frame.
  • an NDPA frame or trigger frame that conforms to the data structure specified by the 802.11ax standard may be referred to as HE NDPA or HE trigger, for example.
  • the station that follows the 802.11ax standard receives the radio frame and parses the radio frame and performs subsequent processing; for a station that does not comply with the 802.11ax standard, such as a VHT STA, it is set to Each STA Info field is 2 bytes. It first reads the AID 12 information field. If the read value does not match its AID, it continues to read the next 2 bytes until it matches its AID, then from the subsequent 4 The bits get the information sent to it.
  • the VHT STA can know by reading the value of the bit B16j+11, or by reading the value of the bit B16j, that is, the VHT STA passes the bit at the above position to 1.
  • the STA info field carries information not related to the VHT STA, so that the STA info field can no longer be processed. (detailed in the examples below.)
  • the transmitting end generates an HE NDPA frame, where the HE NDPA frame includes n STA info fields, where n is a natural number.
  • Each STA info field includes or is used to carry three fields: AID12, Feedback Type, and NC Index; further, it may also include or carry other fields, such as Nr Index, Codebook Information, Grouping Ng, and Partial BW info. Or Combination of meanings.
  • each STA info field contains 4 bytes.
  • the first 12 bits of the 3rd and 4th bytes in each STA info field is set to 1, wherein the 28th bit (or B27) is set to 1 (when the highest bit is on the right side).
  • the highest bit is the 17th bit (B16).
  • the remaining 11 bits of the first information field may carry other information, such as one or more information in the Nr Index, Codebook Information, Grouping Ng, or Partial BW info.
  • the first information field is theoretically interpreted as AID 12field, however, in the embodiment of the present invention, the highest bit of the first information field is used (Maximum) Significant Bit, MSB) is set to 1. In this way, when the VHT STA reads the first information field, the value of the first information field is greater than or equal to 2048, but the value range of the AID is 1-2007, so the VHT STA will implicitly indicate this number. An information field is not AID 12field and does not need to continue processing this information, thus avoiding the VHT STA misreading.
  • MSB Maximum) Significant Bit
  • the highest bit of the AID 12 information field in the STA info field may be set to 0 or 1.
  • This bit can be called the VHT/HE field, as shown in FIG. 6.
  • the VHT/HE information field it may not be included in the STA info field, but in the common information part of the radio frame (we call the part of the STA Info field before the public information part).
  • the VHT/HE information field may be located in the Reserved field of the Sounding Dialog Token, as shown in FIG.
  • the user information carried in the HE NDPA frame should be located at positions other than B27, namely B0-B26 and B28-B31.
  • the length of the STA info field is 4 bytes regardless of the value of the VHT/HE field.
  • the receiver When the receiver receives the HE NDPA frame, if the receiver is a VHT STA, it is set to 2 bytes per STA Info field by default, and it first reads the AID 12 information field, if the value read is followed by If the AID does not match, it continues to read the next 2 bytes until it matches its AID, then the information sent to it is obtained from the next 4 bits.
  • the receiver is a HE STA
  • the receiving is performed according to the receiving process of the VHT STA; when the value of the VHT/HE field is 1, the reading is performed in units of 4 bytes.
  • the reception is stopped and the NDPA frame is discarded.
  • the STA info field contains 4 bytes, and in this example, the STA info field of the HE NDPA frame in this example may include 6 bytes, 8 bytes, or 10 bytes, and the like.
  • the MSB of the first 12 bits in each of the other 2 bytes is set to 1.
  • the STA info field contains 6 bytes
  • its B27 and B43 are set to 1, as shown in FIG. 8, where the VHT/HE field in the example is located in the Reserved field of the common information part.
  • B16 and B32 are set to 1.
  • the receiver When the receiver receives the HE NDPA frame, if the receiver is a VHT STA, it considers each STA Info field to be 2 bytes, and it first reads the AID 12 information field, if the read value is not related to its AID. If it matches, it continues to read the next 2 bytes until it matches its AID, then gets the information sent to it from the next 4 bits. If the receiver is an HE STA, when the value of the VHT/HE field is 0, the receiving is performed according to the receiving process of the VHT STA; when the value of the VHT/HE field is 1, the reading is performed in units of 6 bytes. First read the AID 12 information field.
  • the read value does not match its AID, it will continue to read the next 6 bytes until it matches its AID, then remove the B27 and B43 from the subsequent 36 bits.
  • the information sent to it is obtained from the outer 34 bits.
  • the reception is stopped and the NDPA frame is discarded.
  • the main difference between the first and second examples is that the length of the STA info field of the defined HE NDPA frame is different.
  • the STA info fields in the first and second examples are fixed lengths.
  • a HE NDPA frame having an unspecified length is provided, and the length of the STA info field is changed, and may be 4 bytes, or 6 bytes, 8 bytes, or 10 bytes, and the like.
  • the first indication information needs to be carried in the HE NDPA frame to indicate the length of the STA info field. The first indication information should be located before all STA info fields.
  • One implementation is that it can be located in the Reserved field in the Sounding Dialog Token.
  • a more specific implementation manner is: taking 1 bit from the Reserved domain to carry the first indication information, and a value of 0 indicates that the length of the STA info field is 4 bytes, and a value of 1 indicates the length of the STA info field. 6 bytes, as shown in FIG. 9 below, the length field in FIG. 9 is the first indication information.
  • the first indication information (ie, the length of the STA info field) refers to when the value of the VHT/HE field (see FIG. 6) in the AID12 field is HE (specifically, the bit value is 1, Or the bit value is 0), the length of the STA info field.
  • the first indication information indicates the length of the STA info field.
  • NDPA frames are not limited to NDPA frames, and may be other frames than NDPA frames, and the other frames have the following features: a public information part and a user information part, wherein the AID field in the user information part is the first Information domain.
  • a trigger frame (TF) belongs to one of the other frames. As shown in Figure 10.
  • the present invention also provides a data transmission apparatus (including a method of transmitting or receiving) that can perform the aforementioned method.
  • FIG. 11 is a schematic diagram of a wireless local area network data transmission apparatus according to an embodiment of the present invention.
  • the apparatus includes: a transmitter 1001, a receiver 1002, a memory 1003, and a processor 1004, configured to execute the foregoing wireless local area network data.
  • the device is used on the transmitting side and includes:
  • the processor 1004 is configured to construct or generate a radio frame, at least the structure mentioned in the foregoing embodiment;
  • the transmitter 1001 is configured to send the radio frame to a station STA associated with the AP.
  • the apparatus is for use on a receiving side, comprising a receiver 1002 for receiving a radio frame as described in the preceding embodiments, the processor for parsing the radio frame.
  • a receiving side comprising a receiver 1002 for receiving a radio frame as described in the preceding embodiments, the processor for parsing the radio frame.
  • FIG. 12 is an example of a schematic structural diagram of a data transmission apparatus provided in an embodiment of the present invention (for example, some devices in an access point, a site, or a chip, etc. are optional).
  • data transmission device 1200 can be implemented by bus 1201 as a general bus architecture. Depending on the particular application of data transmission device 1200 and overall design constraints, bus 1201 may include any number of interconnecting buses and bridges. Bus 1201 connects various circuits together, including processor 1202, storage medium 1203, and bus interface 1204. The data transmission device 1200 connects the network adapter 1205 or the like via the bus interface 1204 via the bus interface 1204.
  • the network adapter 1205 can be used to implement signal processing functions of the physical layer in the wireless local area network, and transmit and receive radio frequency signals through the antenna 1207.
  • the user interface 1206 can be connected to a user terminal such as a keyboard, display, mouse, joystick, and the like.
  • the bus 1201 can also be connected to various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and therefore will not be described in detail.
  • the data transfer device 1200 can also be configured as a general purpose processing system including: one or more microprocessors providing processor functionality; and external memory providing at least a portion of the storage medium 1203, all through an external bus system The structure is connected to other support circuits.
  • the data transmission device 1200 can be implemented using an ASIC (Application Specific Integrated Circuit) having a processor 1202, a bus interface 1204, a user interface 1206, and integrated in a single chip. At least a portion of the storage medium 1203, or the data transmission device 1200 can be implemented using one or more of an FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), controller, state machine, gate Any combination of logic, discrete hardware components, any other suitable circuitry, or circuitry capable of performing the various functions described throughout the present invention.
  • ASIC Application Specific Integrated Circuit
  • the processor 1202 is responsible for managing the bus and general processing (including executing software stored on the storage medium 1203).
  • Processor 1202 can be implemented using one or more general purpose processors and/or special purpose processors. Examples of processors include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software.
  • Software should be interpreted broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Storage medium 1203 is shown separated from processor 1202 in FIG. 11, however, those skilled in the art will readily appreciate that storage medium 1203, or any portion thereof, may be located external to data transmission device 1200.
  • storage medium 1203 can include transmission lines, carrier waveforms modulated with data, and/or computer products separate from wireless nodes, all of which can be accessed by processor 1202 through bus interface 1204.
  • storage medium 1203, or any portion thereof, can be integrated into processor 1202, for example, can be a cache and/or a general purpose register.
  • the processor 1202 can perform the above embodiments, and details are not described herein again.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

一种发送无线帧的方法，包括：发送端生成无线帧，该无线帧包括：一个或者多个站点信息字段，该每个站点信息字段长度为2K bytes，其中K为自然数，每个站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；发送所述无线帧。

Description

无线帧的发送与接收方法与装置
本申请要求于2016年5月10日提交中国专利局、申请号为201610305870.9、发明名称为“无线帧的发送与接收方法与装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信技术，尤其涉及无线帧的发送与接收方法与装置。
背景技术
OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)是当前无线通信的基本传输方式，广泛应用于LTE、WiMAX、WiFi等无线通信系统。不仅如此，OFDM也进一步应用到固网传输，比如光纤、铜绞线、电缆等传输方式。OFDM的基本原理是利用子载波的正交性容许的范围内，将子载波间隔压缩到最小，这一方面能保证形成多路并行且互不干扰的通路，同时又能提升系统的频率利用效率。
进一步的，由于OFDM具有以上特性，如果将OFDM的互不干扰的子载波分配给多个用户，就能利用OFDM来实现多用户的接入或者数据传输。这就是OFDMA(Orthogonal Frequency Division Multiple Access,正交频分多址)。所述OFDMA方式发送数据就是发送端将多个接收端的数据通过各自对应的子载波/子信道发送给与所述子载波/子信道关联的接收端。OFDMA的发送方式要求所述子载波/子信道上的数据同步发送，各用户的数据在同步发送时通过各自的子载波/子信道保持正交。由于OFDMA能灵活的方便调度多个用户同时传输，有利于利用OFDMA实现多用户分集的效果；另外，OFDMA能方便的支持多个离散子信道，因此OFDMA可以更有效的利用空白的频段。
类似的，作为有一种利用并行信道支持多用户传输的方式，MU-MIMO(Multiple User-Multiple Input Multiple Output，多用户多输入多输出)利用空间维度实现了并行信道，提供给多个用户作为传输方法。但这种方式 需要发送端(下行,DL MU-MIMO)或者接收端(上行，UL MU-MIMIO)具有全部或者部分信道信息，否则就无法令接收端正确的解调出多路有效信号，导致传输失败。其中，对于DL MU-MIMO而言，发送端利用信道状态信息(Channel State Information,CSI)形成发送波束，在发送端区分多路空间流；而UL MU-MIMO则要求接收端利用信道状态信息形成接收波束，在接收端区分多路空间流。尤其是，针对DL MU-MIMO的情况，为了使得发送端能获取信道状态信息，发送端需要发送训练序列令多个接收端估计信道，并将估计好的信道状态信息反馈给发送端。
另一方面，WLAN(Wireless LAN)其自身的顺序特性是以帧(frame)为单位的数据传输方法。也就是说，需要一种帧结构能够充分利用OFDMA的特性，高效的传输。
发明内容
本发明实施例提供一种无线帧的传输方法，用以解决现有技术中的缺陷，提高无线帧通信的效率。
一方面提供了一种发送无线帧的方法，包括：发送端生成无线帧，该无线帧包括：一个或者多个站点信息字段，该每个站点信息字段长度为2K bytes，其中K为自然数，每个站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；发送所述无线帧。
类似的，另一方面，一种发送无线帧的方法，包括：
发送端生成无线帧，该无线帧包括：一个或者多个站点信息字段STA info field，每个站点信息字段长度为2K bytes，其中K为自然数，例如1,2,3,…，每个站点信息字段中比特位B16j的值被设置为1，其中，j＝1,2,3,…,K-1；
发送所述无线帧。
相应的，提供了一种接收无线帧的方法，包括：
接收无线帧，该无线帧包括：一个或者多个站点信息字段，该每个站点信息字段长度为2K bytes，其中K为自然数，每个站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；
解析所述无线帧，并根据所述比特位B16j+11的值进行处理。
类似的，一种接收无线帧的方法，包括：
接收无线帧，该无线帧包括：一个或者多个站点信息字段STA info field，每个站点信息字段长度为2K bytes，其中K为自然数，例如1,2,3,…，每个站点信息字段中比特位B16j的值被设置为1，其中，j＝1,2,3,…,K-1；
解析所述无线帧，并根据所述比特位B16j的值进行处理。
本发明实施方式还相应的提供了用于执行前述方法的装置，例如芯片或者站点，接入点。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施方式的系统架构示意图；
图2为一种多用户信道状态信息反馈的流程的简单示意图；
图3为一种NDPA帧的格式的简单示意图；
图4为上行OFDMA/MU-MIMO的传输流程的简单示意图；
图5-9分别为一种较优的NDPA帧的格式的简单示意图；
图10为较优的触发帧的格式的简单示意图；
图11-12分别为实现本发明实施方式的一种装置的简单示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
缩略语和关键术语定义：
Figure PCTCN2017082167-appb-000001
Figure PCTCN2017082167-appb-000002
如图1所示，为一个无线局域网WLAN的简单结构示意图，包括接入站或者接入点101，以及一个或者多个站点102。其中，参考图2，为多用户信道状态信息反馈的流程的简单示意图。AP连续发送NDPA(Null Data Packet Announcement，空数据分组声明)和NDP(Null Data Packet，空数据分组)，接收端根据NDPA的指示和NDP的LTF(Long training field，长训练字段)估计信道状态信息，并生成波束成形报告帧(Beamforming Report,BF Report)，将估计好的信道状态信息反馈给AP(Access Point，接入点)。在反馈的过程中，AP发送波束成形报告轮询帧(BF Report Poll)来逐个询问NDPA中所指示的STA(Station，站点),向这些STA索取BF Report。这种逐个询问的方法，会带来较大的开销。另外，一种现有的NDPA帧的格式如图3所示。
为了降低这种开销，如图4所示，为上行OFDMA/MU-MIMO的传输流程的简单示意图，其中引入UL OFDMA，以实现多个用户BF Report的并行传输。但UL OFDMA需要用触发帧(Trigger Frame)实现同步和上行资源分配等信息指示。
在下一代标准802.11ax中引入了OFDMA的特性，STA需要测量整个带宽中的部分信道信息。因此，AP需要在NDPA帧中指示STA所需测量的带宽信息，这部分信息需要额外的比特来指示，而目前的VHT NDPA帧的用户信息部分只有16个bit，而且全部承载了有用信息。因此在802.11ax中，需要一种符合802.11ax标准规定的无线帧(例如HE NDPA帧)来利用OFDMA的特性实现高效的传输。
本发明实施方式提供了一种发送无线帧的方法，包括：
发送端生成无线帧，该无线帧包括：一个或者多个站点信息字段STA info  field，该每个站点信息字段长度为2K bytes，其中K为自然数，例如1,2,3,…，其比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；
发送所述无线帧。上述实施方式中，该站点信息字段最高比特位位于右侧。
另外一种类似的方案中，站点信息字段最高比特位也可以是位于左侧的，这种情况下，类似的，提供了一种发送无线帧的方法，包括
发送端生成无线帧，该无线帧包括：
一个或者多个站点信息字段STA info field，每个站点信息字段长度为2K bytes，其中K为自然数，例如1,2,3,…，其比特位B16j的值被设置为1，其中，j＝1,2,3,…,K-1；
发送该无线帧。
具体的例子中，上述无线帧是一种NDPA帧或者触发帧。尤其是一种遵循802.11ax标准规定的数据结构的NDPA帧或者触发帧，例如可以称为HE NDPA或者HE trigger。
通过上述帧结构，在接收侧，遵循802.11ax标准规定的站点接收上述无线帧后进行解析该无线帧并进行后续的处理；对于不遵循802.11ax标准规定的站点，例如VHT STA，它默认设置为每个STA Info field为2bytes，它首先读取AID 12信息域，若读取的值跟它的AID不匹配，则它继续读取下一个2bytes，直到匹配上其AID时，则从后续的4个比特位获得发送给它的信息。在读取该帧的时候，VHT STA通过读取该比特位B16j+11的值，或者，通过读取比特位B16j的值，也就是说VHT STA通过上述位置上的比特位为1，能够知道该STA info field承载的不是VHT STA的相关的信息，从而可以不再继续处理该STA info field。(后文例子中详述之。)
下面以HE NDPA为例详述。
例子一：
发送端生成HE NDPA帧，该HE NDPA帧中包含n个STA info field，n是自然数。每一个STA info field包含或者用于承载AID12，Feedback Type和NC Index这三个字段；进一步的，还可以包含或者承载其他字段，如Nr Index,Codebook Information,Grouping Ng和Partial BW info等字段之一或者任 意组合。
参考图5，为一个HE NDPA帧的简单示意图。图5的例子中的HE NDPA帧，其每个STA info field包含4个bytes。为了便于说明，我们将每一个STA info field中的第3个和第4个byte中的前12个bits定义为第一信息域。具体的，所述第一信息域的最高位置的值设置为1，其中第28个比特(或称为B27)置为1(最高比特位位于右侧时)。当最高比特位位于左侧时，则该最高比特位为第17个比特(B16)。所述第一信息域的其余11个bit可以承载其他信息，如Nr Index,Codebook Information,Grouping Ng或者Partial BW info中的一种或者多种信息等。
在VHT STA接收并读取所述HE NDPA帧时，理论上将所述第一信息域解释为AID 12field，然而，在本发明实施例中，将所述第一信息域的最高比特位(Maximum Significant Bit,MSB)置为1。这样，当VHT STA读取所述第一信息域时，该第一信息域的值大于或等于2048，但是，AID的取值范围是1-2007，因此VHT STA将被隐式的指示这个第一信息域不是AID 12field，不需要再继续处理该信息，从而避免了VHT STA误读的情况。
另外，所述STA info field中的AID 12信息域的最高位可以设置为0或1，当其设置为0时，表示STA info field与VHT NDPA中的STA info field相同，即为2bytes；当其设置为1时，表示STA info field承载的是802.11ax标准规定的TA info field的长度，例如在本发明实施例中，为4bytes。可以称该比特位为VHT/HE域，如图6所示。
对于所述VHT/HE信息域，它也可以不包含在STA info field中，而是位于无线帧的公共信息部分(我们称所有的STA Info field之前的部分为公共信息部分)。优选地，所述VHT/HE信息域可以位于Sounding Dialog Token的Reserved域中，如图7所示。
由于B27固定置为1，因此所述HE NDPA帧中承载的用户信息应位于除了B27之外的位置，即B0-B26和B28-B31。
另外一种实施方式是，无论VHT/HE域的值为何值，所述STA info field的长度都是4bytes。
当接收机接收到所述HE NDPA帧时，若所述接收机为VHT STA，它默认设置为每个STA Info field为2bytes，它首先读取AID 12信息域，若读取的值跟它的AID不匹配，则它继续读取下一个2bytes，直到匹配上其AID时，则从后续的4个比特位获得发送给它的信息。
若所述接收机为HE STA，当VHT/HE域的值为0时，则按照VHT STA的接收流程进行接收；当VHT/HE域的值为1时，则以4bytes为单位进行读取，首先读取AID 12信息域，若读取的值跟它的AID不匹配，则它继续读取下一个4bytes，直到匹配上其AID时，则从后续的20个比特位中除B27之外的19个比特位中获得发送给它的信息。可选地，若发现B27中的值为0，则停止接收，并丢弃所述NDPA帧。
例子二：
前述的例子一中，STA info field包含4byte，与之不同的是，本例中HE NDPA帧的STA info field可以包含6bytes,8bytes,或者，10bytes等等。在这个例子中，类似于例一，第一个2bytes除外，其他的每个2bytes中的前12bits的MSB置为1。
例如，当STA info field包含6bytes时，其B27和B43置为1，如图8所示，其中示例中的VHT/HE域位于公共信息部分的Reserved域中。另外，当最高比特位位于左侧时，则B16和B32置为1.
当接收机接收到所述HE NDPA帧时，若所述接收机为VHT STA，它认为每个STA Info field为2bytes，它首先读取AID 12信息域，若读取的值跟它的AID不匹配，则它继续读取下一个2bytes，直到匹配上其AID时，则从后续的4个比特位获得发送给它的信息。若所述接收机为HE STA，当VHT/HE域的值为0时，则按照VHT STA的接收流程进行接收；当VHT/HE域的值为1时，则以6bytes为单位进行读取，首先读取AID 12信息域，若读取的值跟它的AID不匹配，则它继续读取下一个6bytes，直到匹配上其AID时，则从后续的36个比特位中除B27和B43之外的34个比特位中获得发送给它的信息。可选地，若发现B27或B43中的值为0，则停止接收，并丢弃所述NDPA帧。
例子三
例一和例二的主要区别在于，所定义的HE NDPA帧的STA info field的长度不同，但是，相对于例三，例一和例二中的STA info field都是固定长度的。例三中，提供了一种具有不特定的长度的HE NDPA帧，其STA info field的长度是变化的，可以为4bytes，或者，6bytes，8bytes，或者10bytes等等。为了让接收端获知STA info field的长度，需要在HE NDPA帧中携带第一指示信息，用于指示STA info field的长度。所述第一指示信息应当位于所有的STA info field之前，一种实施方式是，可以位于Sounding Dialog Token中的Reserved域中。一种更具体的实施方式为，从所述Reserved域中拿出1bit来承载所述第一指示信息，其值为0表示STA info field的长度为4bytes，其值为1表示STA info field的长度为6bytes，如下图9所示，图9中的length字段即为所述第一指示信息。
需要说明的是，所述第一指示信息(即STA info field的长度)是指，当AID12字段中的VHT/HE域(参见图6)的值为HE时(具体表现为比特值为1，或者比特值为0)，STA info field的长度。
另外一种实施方式是，无论VHT/HE域的值为何值，所述第一指示信息指示的都是STA info field的长度。
当然，前述实施方式不限于NDPA帧，还可以是NDPA帧之外的其他帧，所述其他帧具有如下特征：包含公共信息部分和用户信息部分，所述用户信息部分中AID域为第一个信息域。触发帧(trigger frame,TF)属于所述其他帧中的一种。如图10所示。
在触发帧中，同样可以通过前述中的方法，该触发帧中的STA Info field不同的长度。例如，若STA info field在扩展之前包含M bytes，若需要扩展为MK bytes(K＝1,2,3,…)，可将其比特位B(8Mj+11)置为1(j＝1,2,3,…,K-1)。
本发明还提供了可以执行前述方法的数据传输装置(包括发送或者接收的方法)。
图11是本发明实施例提供的一种无线局域网数据的传输装置，参见图11，该装置包括：发射机1001、接收机1002、存储器1003和处理器1004，用于执行如下前述的无线局域网数据的发送方法或者接收方法。该装置用于发送侧，包括：
所述处理器1004，用于构造或者生成无线帧，所述无线帧至少如前述实施方式中提到的结构；
所述发射机1001，用于将所述无线帧发送给与所述AP相关联的站点STA。
或者，该装置用在接收侧，包括接收机1002，所述接收机1002用于接收如前述实施方式所述的无线帧，所述处理器用于解析所述无线帧。其详细处理可以参考前述实施方式，此处不再赘述。
图12为本发明实施方式中所提供的数据传输装置的结构示意图的举例(例如接入点，站点，或者芯片等图中部分器件为可选)。如图12所示，数据传输装置1200可以由总线1201作一般性的总线体系结构来实现。根据数据传输装置1200的具体应用和整体设计约束条件，总线1201可以包括任意数量的互连总线和桥接。总线1201将各种电路连接在一起，这些电路包括处理器1202、存储介质1203和总线接口1204。数据传输装置1200使用总线接口1204将网络适配器1205等经由总线1201连接。网络适配器1205可用于实现无线局域网中物理层的信号处理功能，并通过天线1207实现射频信号的发送和接收。用户接口1206可以连接用户终端，例如：键盘、显示器、鼠标、操纵杆等。总线1201还可以连接各种其它电路，如定时源、外围设备、电压调节器、功率管理电路等，这些电路是本领域所熟知的，因此不再详述。
数据传输装置1200也可配置成通用处理系统，该通用处理系统包括:提供处理器功能的一个或多个微处理器；以及提供存储介质1203的至少一部分的外部存储器，所有这些都通过外部总线体系结构与其它支持电路连接在一起。
可替换地，数据传输装置1200可以使用下述来实现:具有处理器1202、总线接口1204、用户接口1206的ASIC(专用集成电路)；以及集成在单个芯片 中的存储介质1203的至少一部分，或者，数据传输装置1200可以使用下述来实现:一个或多个FPGA(现场可编程门阵列)、PLD(可编程逻辑器件)、控制器、状态机、门逻辑、分立硬件部件、任何其它适合的电路、或者能够执行本发明通篇所描述的各种功能的电路的任意组合。
处理器1202负责管理总线和一般处理(包括执行存储在存储介质1203上的软件)。处理器1202可以使用一个或多个通用处理器和/或专用处理器来实现。处理器的例子包括微处理器、微控制器、DSP处理器和能够执行软件的其它电路。应当将软件广义地解释为表示指令、数据或其任意组合，而不论是将其称作为软件、固件、中间件、微代码、硬件描述语言还是其它。
在图11中存储介质1203被示为与处理器1202分离，然而，本领域技术人员很容易明白，存储介质1203或其任意部分可位于数据传输装置1200之外。举例来说，存储介质1203可以包括传输线、用数据调制的载波波形、和/或与无线节点分离开的计算机制品，这些介质均可以由处理器1202通过总线接口1204来访问。可替换地，存储介质1203或其任意部分可以集成到处理器1202中，例如，可以是高速缓存和/或通用寄存器。
处理器1202可执行上述实施例，在此不再赘述。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。

Claims (16)

  1. 一种发送无线帧的方法，包括：
    发送端生成无线帧，所述无线帧包括：一个或者多个站点信息字段，每个所述站点信息字段长度为2K bytes，其中K为自然数，每个所述站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；
    发送所述无线帧。
  2. 根据权利要求1所述的方法，其特征在于，所述无线帧是一种遵循802.11ax标准规定的数据结构的空数据分组声明NDPA帧或者触发帧；
    所述比特位B16j+11的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段。
  3. 根据权利要求1或者2的方法，其特征在于，所述每个所述站点信息字段长度为4bytes；
    所述比特位B16j+11的值被设置为1，具体为：所述站点信息字段的第28个比特位(即比特位B27)的值被设置为1。
  4. 根据权利要求3所述的方法，其特征在于，所述比特位B27的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段中的第3个和第4个byte中的前12个bits。
  5. 一种接收无线帧的方法，包括：
    接收无线帧，所述无线帧包括：一个或者多个站点信息字段，所述每个站点信息字段长度为2K bytes，其中K为自然数，每个站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；
    解析所述无线帧，并根据所述比特位B16j+11的值进行处理。
  6. 根据权利要求5所述的方法，其特征在于，所述无线帧是一种遵循802.11ax标准规定的数据结构的空数据分组声明NDPA帧或者触发帧；
    所述比特位B16j+11的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段。
  7. 根据权利要求5或者6的方法，其特征在于，所述每个所述站点信息字段长度为4bytes；
    所述比特位B16j+11的值被设置为1，具体为：所述站点信息字段的第28 个比特位(即比特位B27)的值被设置为1。
  8. 根据权利要求7所述的方法，其特征在于，所述比特位B27的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段中的第3个和第4个byte中的前12个bits。
  9. 一种数据传输装置，包括
    用于生成无线帧的模块，所述无线帧包括：一个或者多个站点信息字段，每个所述站点信息字段长度为2K bytes，其中K为自然数，每个所述站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；和，
    用于发送所述无线帧的模块。
  10. 根据权利要求9所述的装置，其特征在于，所述无线帧是一种遵循802.11ax标准规定的数据结构的空数据分组声明NDPA帧或者触发帧；
    所述比特位B16j+11的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段。
  11. 根据权利要求9或者10的装置，其特征在于，所述每个所述站点信息字段长度为4bytes；
    所述比特位B16j+11的值被设置为1，具体为：所述站点信息字段的第28个比特位(即比特位B27)的值被设置为1。
  12. 根据权利要求11所述的装置，其特征在于，所述比特位B27的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段中的第3个和第4个byte中的前12个bits。
  13. 一种接收无线帧的装置，包括：
    用于接收无线帧的模块，所述无线帧包括：一个或者多个站点信息字段，每个所述站点信息字段长度为2K bytes，其中K为自然数，每个所述站点信息字段中比特位B16j+11的值被设置为1，其中，j＝1,2,3,…,K-1；
    解析所述无线帧，并根据所述比特位B16j+11的值进行处理。
  14. 根据权利要求13所述的装置，其特征在于，所述无线帧是一种遵循802.11ax标准规定的数据结构的空数据分组声明NDPA帧或者触发帧；
    所述比特位B16j+11的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段。
  15. 根据权利要求13或者14的装置，其特征在于，所述每个所述站点信息字段长度为4bytes；
    所述比特位B16j+11的值被设置为1，具体为：所述站点信息字段的第28个比特位(即比特位B27)的值被设置为1。
  16. 根据权利要求7所述的装置，其特征在于，所述比特位B27的值被设置为1，用于避免不遵循802.11ax标准规定的接收端误读所述站点信息字段中的第3个和第4个byte中的前12个bits。
PCT/CN2017/082167 2016-05-10 2017-04-27 无线帧的发送与接收方法与装置 Ceased WO2017193818A1 (zh)

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