WO2021008580A1 - 信道探测方法及装置 - Google Patents

信道探测方法及装置 Download PDF

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Publication number
WO2021008580A1
WO2021008580A1 PCT/CN2020/102333 CN2020102333W WO2021008580A1 WO 2021008580 A1 WO2021008580 A1 WO 2021008580A1 CN 2020102333 W CN2020102333 W CN 2020102333W WO 2021008580 A1 WO2021008580 A1 WO 2021008580A1
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Prior art keywords
sta
information
channel
aps
data
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PCT/CN2020/102333
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English (en)
French (fr)
Inventor
梁丹丹
淦明
于健
黄国刚
郭宇宸
禄彼得
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华为技术有限公司
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Publication of WO2021008580A1 publication Critical patent/WO2021008580A1/zh
Priority to US17/576,077 priority Critical patent/US20220140879A1/en

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    • 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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/0417—Feedback systems
    • 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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the embodiments of the present application relate to the field of communications, and in particular, to a channel detection method and device.
  • WLAN Wireless Local Area Network
  • APs wireless access points
  • the problem of inter-cell interference is also brought about. How to reduce inter-cell interference and improve user service quality through cooperation between APs has become an urgent problem to be solved.
  • the AP channel sounding can refer to the 802.11ac channel sounding (Sounding) process, as shown in Figure 1.
  • the AP first sends a Null Data Packet Announcement (NDPA) frame to notify the station (Station, STA) that needs to perform channel detection, and the parameters of the relevant channel detection, and then the short inter-frame interval After Space, SIFS), broadcast the NDP frame, where the NDP frame does not carry the data field part.
  • the STA can perform channel estimation on the AP based on the received NDP, and generate a beamforming report (BFR).
  • BFR beamforming report
  • the AP sends a beamforming report poll (BFReport Poll, BFRP) to the STA to request one or more STAs for channel state information that has not been fed back or fed back incorrectly.
  • BFReport Poll BFReport Poll
  • the beamforming report in the prior art includes a Multiple Input Multiple Output (MIMO) control field and a beamforming report field.
  • MIMO control field may include, but is not limited to: bandwidth, number of transmit antennas, number of receive antennas
  • the structure of the MIMO control field can be as shown in Figure 2.
  • 802.11ac and 802.11ax it is a channel detection scheme for a single AP and multiple STAs.
  • the STA can perform channel detection based on the NDP frame and obtain channel state information.
  • the master AP needs to obtain the channel state information of all APs, and select cooperative APs based on the channel state information.
  • selecting a cooperative AP based on the channel state information of all APs will result in a large feedback overhead of the channel state information, and thus low efficiency.
  • the present application provides a channel detection method and device, which can implement a cooperative AP selection method that saves channel state information feedback overhead.
  • an embodiment of the present application provides a channel detection method.
  • the method may include: a STA receives channel detection frames sent by n APs, where n is an integer greater than 1. Then, the STA can perform channel sounding on the channels of n APs based on the received channel sounding frame, and obtain the channel state information of each AP. And, the STA sends a channel measurement report frame, where the channel measurement report frame includes the channel state information of the m target APs and the identifiers of the m target APs among the n APs, and the channel measurement report frame can also be used to indicate that the m target APs are Select to participate in cooperative transmission, where m is an integer greater than 1 and less than or equal to n.
  • the STA can select the cooperative AP based on the channel state information.
  • the STA can notify the AP whether it is selected to participate in cooperative transmission by feeding back channel state information.
  • the AP can also confirm whether it is selected to participate in cooperative transmission according to whether it has acquired the channel state information.
  • an AP that has not acquired channel state information can determine that the channel state between it and the STA is poor, thereby providing an AP selection method that saves channel sounding feedback overhead.
  • the method may further include: the STA sends indication information, and the indication information may be used to indicate that (n-m) non-target APs are not selected to participate in coordinated transmission.
  • the STA can notify the non-target AP that it is not selected to participate in cooperative transmission by feeding back indication information.
  • the indication information may include channel quality information of (nm) non-target APs, and (nm) identifications of non-target APs; or, the indication information may include unselected indication information, And, the identifiers of (nm) non-target APs, the unselected indication information is used to indicate that (nm) non-target APs are not selected, and the channel quality information is used to indicate the channel quality of the channel between the non-target AP and the STA.
  • the STA can notify the non-target AP that it is not selected to participate in cooperative transmission by feeding back channel quality information to the non-target AP, or feeding back the non-selection indication information to the non-target AP.
  • this application effectively saves channel overhead and improves resource utilization.
  • the channel measurement report frame before sending the channel measurement report frame, it further includes: STA sending or receiving feedback type indication.
  • the feedback type indication is used to indicate the type of channel state information fed back by the STA.
  • the type of channel state information fed back by the STA includes: Selective feedback and non-selective feedback.
  • the feedback type indication can be sent by the STA or AP.
  • the STA and/or AP can notify the STA by sending the feedback type indication, or the AP, or the AP and STA will use the STA to perform the target AP Select and selectively feedback the feedback mode of channel state information.
  • selective feedback means that the STA feeds back channel state information of some of the n APs
  • non-selective feedback means that the STA feeds back channel state information of each of the n APs.
  • the STA and/or AP can learn whether the current feedback process is selective feedback before the STA feedbacks. If it is selective feedback, the AP can confirm that it is selected to participate in cooperative transmission when the channel state information is acquired, and the AP can confirm that it is not selected when the channel state information is not acquired. In the case of non-selective feedback, AP and STA can perform feedback in a conventional feedback manner.
  • the channel measurement report frame includes: a multiple-input multiple-output control field, and the feedback type field of the multiple-input multiple output control field is a reserved value, which is used to indicate that the type of the STA feedback channel state information is optional Feedback.
  • the AP and STA can determine that the channel state information feedback mode is selective feedback to distinguish it from other non-selective feedback.
  • the channel state information of the m target APs meets the preset condition, where, if the cooperative transmission is joint transmission, the m APs with the best channel state information among the n APs meet the preset condition; If the coordinated transmission is coordinated beamforming transmission, the p APs with the best channel state information and the q APs with the worst channel state information among the n APs meet the preset condition, where the sum of p and q is equal to m.
  • the STA can determine the AP corresponding to the channel state that meets the preset conditions according to different cooperative transmission modes.
  • the method further includes: the STA receives first data sent by the main AP, where the first data is data shared among m target APs, and the main AP is included in the m target APs; If the STA fails to receive the first data, the STA sends a retransmission request frame to p retransmission APs out of m target APs.
  • the retransmission request frame is used to instruct p retransmission APs to retransmit the first data, and p is greater than or An integer equal to 1 and less than or equal to m.
  • a data retransmission method in cooperative transmission is realized.
  • the STA fails to receive the first data, it can select p retransmission APs and request the retransmission AP to resend the first data.
  • the retransmission request frame includes a destination address field, a retransmission AP information field, a retransmission mode field, and a sending address indication field; where the destination address field is a broadcast address or a retransmission AP
  • the retransmission AP information field includes the identification information of the retransmission AP; the retransmission mode field is used to indicate whether joint transmission is used to retransmit the first data; the sending address indication field is used to indicate that the first data carries the address information of the main AP .
  • the STA can instruct the retransmission AP to send the first data through the retransmission request frame.
  • the re-sent first data may include address information carried in the sending address indication field.
  • the method further includes: receiving first data retransmitted by the retransmission AP, where the first data includes the address information of the master AP; Transmit the first data retransmitted by the AP and the first data sent by the main AP, perform joint soft decoding, and obtain the first data after joint soft decoding.
  • the STA can select an AP other than the main AP as the retransmission AP, and when the retransmission AP sends the first data, the first data can carry the main AP, or in other words, the AP that sent the first data last time
  • the address information allows STA to perform joint soft decoding on the same data (first data) received twice or more to improve the decoding success rate.
  • an embodiment of the present application provides a channel sounding method.
  • the method may include: the AP sends a channel sounding frame, and the channel sounding frame is used by the station STA to perform channel sounding based on the channel sounding frame and obtain channel state information;
  • the entry point receives the feedback information sent by the STA;
  • the AP determines whether it is selected by the STA to participate in cooperative transmission.
  • the step of determining whether the AP is selected by the STA to participate in coordinated transmission based on the feedback information may include: receiving a channel measurement report frame fed back by the STA, and identifying whether the channel measurement report frame includes AP identification information and Channel state information; if identification information and channel state information are identified, it is determined that the AP is selected to participate in cooperative transmission.
  • the step of determining whether the AP is selected by the STA to participate in coordinated transmission based on the feedback information may further include: the AP receives indication information sent by the STA, and the indication information is used to indicate that the AP is not selected to participate in coordinated transmission; Based on the indication information, the AP determines that the AP is not selected to participate in cooperative transmission.
  • the indication information includes the channel quality information of the AP and the identification of the AP; or, the indication information includes the unselected indication information, and the identification of the AP.
  • the unselected indication information is used to indicate that the AP has not been selected. Selected.
  • the STA before the STA feeds back the channel measurement report frame, it further includes: the AP sends or receives a feedback type indication, the feedback type indication is used to indicate the type of channel state information that the STA feedbacks, and the type of channel state information that the STA feedbacks Including: selective feedback and non-selective feedback.
  • the method further includes: the AP receives the first data sent by the main AP to the AP and the STA; the AP receives the retransmission request frame sent by the STA, where the retransmission request frame indicates that the STA fails to receive the first data Later sent to the AP, the retransmission request frame is used to instruct the AP to resend the first data; to send the first data to the STA.
  • the retransmission request frame includes a sending address indication field for indicating the address information of the main AP that sends the first data
  • the method further includes: the AP sends the STA including the address information of the main AP The first data.
  • an embodiment of the present application provides a communication device applied to an STA.
  • the device may include: a transceiver module and an acquisition module.
  • the transceiver module can be used to receive channel detection frames sent by n APs, where n is an integer greater than 1.
  • the acquisition module can be used to perform channel detection based on the channel detection frame to acquire the channel state information of each AP; the transceiver module can also be used to send Channel measurement report frame.
  • the channel measurement report frame includes the channel state information of m target APs among n APs and the identification of m target APs.
  • the channel measurement report frame is also used to indicate that m target APs are selected to participate in cooperative transmission. Is an integer greater than 1 and less than or equal to n.
  • the transceiver module may also be used to send indication information, which is used to indicate that (n-m) non-target APs are not selected to participate in cooperative transmission.
  • the indication information includes channel quality information of (nm) non-target APs, and, (nm) identifications of non-target APs; or, the indication information includes unselected indication information, and, (nm) ) Identifiers of non-target APs, the unselected indication information is used to indicate that (nm) non-target APs are not selected, and the channel quality information is used to indicate the channel quality of the channel between the non-target AP and the STA.
  • the receiving module is also used to send or receive feedback type indications, which are used to indicate the type of channel state information fed back by the STA.
  • the types of channel state information fed back by the STA include: selective feedback and non- Selective feedback.
  • selective feedback means that the STA feeds back channel state information of some of the n APs
  • non-selective feedback means that the STA feeds back channel state information of each of the n APs.
  • the channel measurement report frame includes: a multiple-input multiple-output control field, and the feedback type field of the multiple-input multiple output control field is a reserved value, which is used to indicate that the type of the STA feedback channel state information is optional Feedback.
  • the channel state information of the m target APs meets the preset condition, where, if the cooperative transmission is joint transmission, the m APs with the best channel state information among the n APs meet the preset condition; If the coordinated transmission is coordinated beamforming transmission, the p APs with the best channel state information and the q APs with the worst channel state information among the n APs meet the preset condition, where the sum of p and q is equal to m.
  • the transceiver module is further configured to: receive the first data sent by the main AP, where the first data is data shared among m target APs, and the main AP is included in the m target APs ; If the STA fails to receive the first data, it sends a retransmission request frame to p retransmission APs in the m target APs.
  • the retransmission request frame is used to instruct p retransmission APs to retransmit the first data, and p is greater than or An integer equal to 1 and less than or equal to m.
  • the retransmission request frame includes a destination address field, a retransmission AP information field, a retransmission mode field, and a sending address indication field; where the destination address field is a broadcast address or a retransmission AP
  • the retransmission AP information field includes the identification information of the retransmission AP; the retransmission mode field is used to indicate whether joint transmission is used to retransmit the first data; the sending address indication field is used to indicate that the first data carries the address information of the main AP .
  • the transceiver module is further configured to: receive the first data retransmitted by the retransmission AP, where the first data includes address information of the master AP;
  • the STA further includes a decoding module configured to perform joint soft decoding based on the first data retransmitted by the retransmission AP and the first data sent by the main AP to obtain the first data after joint soft decoding.
  • an embodiment of the present application provides a communication device applied to an AP, including: a transceiver module and a processing module, wherein the transceiver module can be used to send a channel sounding frame, and the channel sounding frame is used by the STA to perform channel based on the channel sounding frame.
  • the transceiver module is also used to receive feedback information sent by the STA; the processing module can be used to determine whether the AP is selected by the STA to participate in cooperative transmission based on the feedback information.
  • the transceiver module is also used to receive the channel measurement report frame fed back by the STA, and the processing module is further used to identify whether the channel measurement report frame includes AP identification information and channel state information; if identification information is identified And channel state information, the processing module determines that the AP is selected to participate in cooperative transmission.
  • the transceiver module is also used to receive indication information sent by the STA, the indication information is used to indicate that the AP is not selected to participate in cooperative transmission; the processing module is further used to determine that the AP is not selected to participate in cooperation based on the indication information transmission.
  • the indication information includes the channel quality information of the AP and the identification of the AP; or, the indication information includes the unselected indication information, and the identification of the AP.
  • the unselected indication information is used to indicate that the AP has not been selected. Selected.
  • the transceiver module is also used to send or receive feedback type indications, which are used to indicate the type of channel state information fed back by the STA.
  • the types of channel state information fed back by the STA include: selective feedback and non- Selective feedback.
  • the transceiver module is also used to: receive the first data sent by the main AP to the AP and STA; receive the retransmission request frame sent by the STA, where the retransmission request frame means that the STA fails to receive the first data Later sent to the AP, the retransmission request frame is used to instruct the AP to resend the first data; to send the first data to the STA.
  • the retransmission request frame contains a sending address indication field, which is used to indicate the address information of the main AP that sends the first data
  • the transceiver module is further used to: the AP sends the STA including the main AP The first data of address information.
  • an embodiment of the present application provides a device, which may be an STA device or a chip in the STA.
  • the device has the function of realizing the above-mentioned first aspect involving STA. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the STA when the device is an STA, the STA includes a processor and a transceiver, and the processor is configured to support the STA to perform corresponding functions in the foregoing aspects.
  • the transceiver is used to support the communication between the STA and the AP, and send the information or instructions involved in the above method to the AP.
  • the STA may further include a memory, which is used for coupling with the processor and stores necessary program instructions and data of the STA.
  • the device includes a processor, a baseband circuit, a radio frequency circuit, and an antenna.
  • the processor is used to control the functions of each circuit part, and the baseband circuit is used to generate various signaling and messages, such as buffer instruction messages, which are processed by analog conversion, filtering, amplification, and up-conversion through the radio frequency circuit, and then sent through the antenna To AP.
  • the device may also include a memory, which stores necessary program instructions and data for the STA.
  • the device can include a processor and a modem.
  • the processor can be used to run instructions or an operating system to control STA functions.
  • the modem can encapsulate, encode, decode, and modulate data according to the protocol. Demodulation, equalization, etc., to generate signaling information, such as channel sounding report frames, etc., to support the STA to perform the corresponding functions in the first aspect.
  • the chip when the device is a chip in an STA, the chip includes a processing module and a transceiver module.
  • the processing module may be a processor, for example, the processor is used to generate various messages and messages. After the various messages are encapsulated in accordance with the protocol, they are encoded, modulated, and amplified.
  • the processor can also be used to demodulate, decode, and decapsulate to obtain signaling and messages.
  • the transceiver module may be, for example, The input/output interfaces, pins or circuits on the chip.
  • the processing module can execute computer-executable instructions stored in the storage unit to support the STA to perform the corresponding functions in the above aspects.
  • the storage unit may be a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the STA, such as a read-only memory ( Read-only memory (ROM for short) or other types of static storage devices that can store static information and instructions, random access memory (RAM for short), etc.
  • ROM Read-only memory
  • RAM random access memory
  • the device includes a processor, which is configured to be coupled with a memory, read instructions in the memory, and execute the STA-related method in the first aspect according to the instructions.
  • the memory may be located inside the processor or outside the processor.
  • the processor mentioned in any of the above can be a general-purpose central processing unit (Central Processing Unit, CPU for short), microprocessor, application-specific integrated circuit (ASIC for short), or one or A plurality of integrated circuits used to control the program execution of the above-mentioned channel detection methods.
  • CPU Central Processing Unit
  • ASIC application-specific integrated circuit
  • the present application provides a device, which may be an AP or a chip in the AP.
  • the device has the function of realizing the AP involved in the second aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the AP when the device is an AP, the AP includes a processor and a transceiver, and the processor is configured to support the AP to perform corresponding functions in the foregoing method.
  • the transceiver is used to support the communication between the AP and the AP or the AP and the station, and receives the information or instructions involved in the above method sent by the STA, for example, a channel measurement report frame.
  • the AP may further include a memory, which is used for coupling with the processor and stores program instructions and data necessary for the AP.
  • the device includes a processor, a baseband circuit, a radio frequency circuit, and an antenna.
  • the processor is used to control the functions of each circuit part.
  • the radio frequency circuit can digitally convert, filter, amplify and down-convert the signaling sent by the STA received via the antenna, and then decode it through the baseband circuit according to the protocol. Encapsulate to obtain signaling information.
  • the device further includes a memory, which stores program instructions and data necessary for the AP.
  • the device includes a processor and a modem.
  • the processor can be used for instructions or an operating system to control AP functions.
  • the modem can encapsulate, encode, decode, and modulate data according to the protocol. , Equalization, etc. to generate channel sounding frames, or to parse channel measurement report frames, etc., to support the AP to perform the corresponding functions in the above second aspect.
  • the chip when the device is a chip in the AP, the chip includes a processing module and a transceiver module.
  • the processing module may be, for example, a processor.
  • the processor may be used to For the signaling of the signal, filtering, demodulation, power amplification, decoding, etc.
  • the transceiver module may be an input/output interface, pin, or circuit on the chip, for example.
  • the processing module can execute computer-executable instructions stored in the storage unit to support the AP to perform the corresponding functions of the second aspect.
  • the storage unit may be a storage unit in the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit in the AP located outside the chip, such as a read-only memory ( Read-only memory (ROM for short) or other types of static storage devices that can store static information and instructions, random access memory (RAM for short), etc.
  • ROM Read-only memory
  • RAM random access memory
  • the device includes a processor, which is configured to be coupled with a memory, read instructions in the memory, and execute the method described in the above second aspect according to the instructions.
  • the memory may be located inside the processor or outside the processor.
  • the processor mentioned in any of the above can be a general-purpose central processing unit, a microprocessor, a specific application integrated circuit, or one or more integrated circuits used to control the execution of the programs of the channel detection methods in the above aspects.
  • the present application provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, and the instructions may be executed by one or more processors on a processing circuit.
  • the computer runs on a computer, the computer is caused to execute the method in any one of the foregoing first aspect or second aspect or any possible implementation manner thereof.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute any one of the above-mentioned first aspect or second aspect or the method in any possible implementation manner thereof.
  • this application provides a chip system that includes a processor for supporting the data sending device to implement the functions involved in the above aspects, such as generating or processing data and/or data involved in the above aspects. information.
  • the chip system further includes a memory, and the memory is used to store necessary program instructions and data of the data sending device.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • an embodiment of the present application provides a wireless communication system, which includes at least one STA and at least one AP involved in the foregoing aspects.
  • Fig. 1 is a schematic diagram of a channel sounding process exemplarily shown
  • Fig. 2 is a schematic diagram showing a frame structure of a MIMO control field exemplarily
  • FIG. 3 is one of schematic diagrams of an application scenario provided by an embodiment of the present application.
  • FIG. 4 is one of the schematic flowcharts of a channel sounding method provided by an application embodiment
  • FIG. 5 is a schematic diagram of a frame structure of a declaration frame provided by an application embodiment
  • FIG. 6 is a schematic diagram of a frame structure of a channel measurement report frame provided by an application embodiment
  • FIG. 7 is one of the schematic diagrams of the frame structure of an NDPA frame provided by an application embodiment
  • FIG. 8 is one of the schematic flowcharts of a channel sounding method provided by an application embodiment
  • FIG. 9 is a schematic diagram of a frame structure of an indication frame provided by an application embodiment.
  • FIG. 10 is one of the schematic diagrams of the frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 11 is one of the schematic diagrams of the frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 12 is one of the schematic diagrams of the frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 13 is one of the schematic diagrams of the frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 14 is a schematic diagram of a frame structure of an NDPA frame provided by an application embodiment
  • FIG. 15 is one of the schematic flowcharts of a channel sounding method provided by an application embodiment
  • FIG. 16 is one of schematic diagrams of a frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 17 is one of the schematic diagrams of the frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 18 is one of schematic diagrams of a frame structure of a beamforming report frame provided by an application embodiment
  • FIG. 19 is one of the schematic flowcharts of a channel sounding method provided by an application embodiment
  • 20 is a schematic diagram of a frame structure of a retransmission frame provided by an application embodiment
  • FIG. 21 is a schematic diagram of a frame structure of a physical preamble provided by an application embodiment
  • FIG. 22 is one of schematic diagrams of an application scenario provided by an embodiment of the present application.
  • FIG. 23 is one of the schematic block diagrams of a device on the STA side according to an embodiment of the present application.
  • FIG. 24 is the second schematic block diagram of a device on the STA side according to an embodiment of the present application.
  • FIG. 25 is one of the schematic block diagrams of a device on the AP side according to an embodiment of the present application.
  • FIG. 26 is the second schematic block diagram of an AP-side device provided by an embodiment of the present application.
  • first and second in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of objects.
  • first target object and the second target object are used to distinguish different target objects, rather than to describe the specific order of the target objects.
  • words such as “exemplary” or “for example” are used as examples, illustrations, or illustrations. Any embodiment or design solution described as “exemplary” or “for example” in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as “exemplary” or “for example” are used to present related concepts in a specific manner.
  • multiple means two or more.
  • multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.
  • FIG. 3 is a schematic diagram of an application scenario provided by an embodiment of this application.
  • This application scenario includes AP1, AP2, AP3, and STA.
  • the STA is a communication device with wireless transceiver function. For example, it can communicate with other network elements based on the 802.11 protocol.
  • the STA can also be called user terminal, user device, access device, subscriber station , Subscriber unit, mobile station, user agent, user equipment or other names, such as computers, smart phones, tablets and other equipment;
  • AP is a communication device with wireless transceiver function that can provide services for STA, for example, it can be based on
  • the 802.11 protocol communicates with other network elements, such as access points, routers, switches, micro base stations or small base stations in the WLAN communication system. It should be noted that in actual applications, the number of APs is one or more than one, and the number of STAs can be one or more.
  • the number of STAs and APs in the application scenario shown in FIG. 3 is only an illustrative example. This application does not limit this.
  • the STA may select the cooperative AP based on the channel state information after channel measurement on the channel of the AP, and notify each AP whether it is selected by sending channel state information, that is, each AP
  • the channel state information can be received to determine whether to be selected to participate in cooperative transmission.
  • scenario in which the STA sends its required channel state information to the selected AP without feeding back any result to the unselected AP is recorded as scenario 1.
  • scenario in which the STA sends the channel state information required by the STA to the selected APs and sends the unselected APs that can indicate part of the channel state information but not all the channel state information it needs is recorded as scenario 2.
  • scenario three the cooperative transmission process based on the channel state information of the STA and the feedback result is denoted as scenario three. The following describes each scenario in detail with reference to FIG. 3.
  • FIG. 4 is a schematic flowchart of a channel detection method in an embodiment of this application, and in FIG. 4:
  • Step 101 n APs send channel sounding frames to STAs.
  • n is an integer greater than 1.
  • the AP before sending the channel sounding frame, the AP sends an NDPA frame to notify the STA to perform channel sounding on the channel of the AP.
  • the master AP and the slave AP can both send NDPA frames, that is, the APs can send NDPA frames and NDP frames respectively, and optionally, only one of the APs can send NDPA frames, which is not limited in this application.
  • AP1 may send an NDPA frame to inform STAs and APs participating in channel sounding.
  • the APs participating in channel detection include AP1, AP2, AP3, and AP1 broadcast NDPA frames, they are used to notify the STA in Figure 3 to perform channel detection on the channels of AP1, AP2, and AP3.
  • AP1 can broadcast NDPA frames to notify STAs to perform channel detection based on the NDP frames sent by AP1, and then AP1 sends NDP frames; then, AP2 also broadcasts NDPA frames to notify STAs to perform channel detection based on the NDP frames sent by AP2; similar to AP3 .
  • Step 102 The STA performs channel sounding on the channels of n APs to obtain channel state information.
  • the STA may perform channel detection on the channels of AP1, AP2, and/or AP3 based on the NDP frame to obtain the channel status information.
  • the channel state information is information that reflects the channel conditions between the AP and the STA, and can characterize the characteristics of the channel between the AP and the STA.
  • the AP can obtain the downlink channel between the AP and the STA according to the channel state information fed back by the STA According to the status of the channel, it can communicate with the STA on the channel (send and receive signaling or data).
  • Step 103 The STA selects m target APs from n APs according to the channel state information.
  • the STA may match the channel state information of each AP with a preset condition, where the AP whose channel state information meets the preset condition is the target AP, and the channel state information does not meet the preset condition.
  • the preset condition may be: selecting the AP with the best channel state information. If the coordinated transmission is coordinated beamforming transmission, the preset condition may be: selecting the AP with the best channel state information and the AP with the worst channel state information as the target AP.
  • the m target APs may also be the APs with the worst channel state information.
  • the channel state information can best refer to the channel state information being greater than or equal to the upper threshold, and the worst channel state information can refer to the channel state information being less than or equal to the lower threshold; in another implementation, the channel State information can best refer to the largest channel state information, and the worst channel state information can refer to the smallest channel state information.
  • the STA can select m APs with better channel status among the n APs as the target AP.
  • the STA may select m APs with poor channel status among the n APs as the target AP, and the selected m target APs will be used in the coordinated beamforming transmission To associate with other STAs.
  • k APs (k is an integer greater than or equal to 1) for cooperative transmission with the STA have been selected, the STA will select (nk) APs from the n APs except for the k APs Select m target APs. This reduces the interference caused by the channels between the m target APs and other STAs on the channels between the k APs and the STAs in FIG. 1.
  • the STA can select the AP with poor channel state information (such as AP3) among AP2 and AP3 as the target AP, and the target AP will Another STA (not shown in the figure) associates.
  • AP1 sends data 1 to the STA, and at the same time, AP3 sends data 2 to another STA.
  • the STA can also select m APs with the best channel state information and the worst channel state information as the target APs, where the number of APs corresponding to the best detection result is equal to
  • the AP with the worst channel state information can perform coordinated beamforming transmission to provide services for the STA.
  • the STA selects the target AP after acquiring the channel state information of n APs, and performs the subsequent feedback process.
  • the STA can also use instantaneous judgment and feedback.
  • the STA can perform channel detection on the AP’s channel and obtain channel quality information.
  • the AP can determine whether the status of the downlink channel is good or bad based on the channel quality information. . Among them, if it is determined that the status of the downlink channel is good (the specific determination method will be described in the following embodiment), the AP selects the corresponding AP as the target AP, and feeds back channel status information to the target AP.
  • the channel quality information can be any index that can reflect the channel quality between the STA and the AP, but the channel quality information cannot enable the AP to obtain the channel characteristics required for data transmission through the downlink channel based on the index. That is to say, the AP can determine whether the status of the downlink channel is good or bad based on the channel quality information, but the AP cannot obtain all the channel characteristics required for data transmission through the downlink channel based on the channel quality information, and therefore cannot perform subsequent data transmission. process.
  • the channel quality information acquisition method is simpler and faster, so that after acquiring the channel quality information, the STA can determine whether the channel state of the AP meets the preset conditions, or whether it can be used as a target AP participates in cooperative transmission.
  • the information amount of the channel feature represented by the channel quality information is less than the information amount of the channel feature represented by the channel state information.
  • the channel quality information includes but is not limited to: signal strength indication (Received Signal Strength Indication, RSSI), signal-to-noise ratio (Signal-to-Noise Ratio, SNR), signal to interference plus noise ratio (Signal to Interference plus Noise) Ratio, SINR) or channel correlation, etc.
  • the preset condition may be: if the channel quality information of the AP is greater than or equal to the first threshold, it is determined that the preset condition is satisfied.
  • the preset condition may be: if the channel quality information of the AP is less than or equal to the second threshold, it is determined that the preset condition is satisfied.
  • the first threshold and the second threshold may adopt a protocol agreed manner, or may be determined by the AP and assigned to the STA, or may be determined by the STA itself, which is not limited in this embodiment of the application.
  • the STA may set a first threshold, and select an AP with channel quality information greater than or equal to the first threshold as the target AP.
  • the channel quality information and the first threshold may both be indicators such as RSSI, SNR, SINR, or channel correlation.
  • RSSI the index obtained is RSSI.
  • the STA compares the RSSI with the preset RSSI (which can be set according to actual needs). If it is equal to the preset RSSI, it is determined that AP2 is the target AP.
  • the setting of other optional thresholds can be set according to actual needs, which is not limited in this application.
  • the STA may set a second threshold and select an AP whose channel quality information is less than or equal to the second threshold as the target AP.
  • the channel quality information and the second threshold may both be indicators such as RSSI, SNR, SINR, or channel correlation, and the second threshold may be the same as or different from the first threshold, which is not limited in this application.
  • the STA selects AP1 and AP2 from AP1, AP2, and AP3 as target APs participating in coordinated transmission, and AP3 is a non-target AP that is not selected for coordinated transmission.
  • Step 104 The STA sends a channel measurement report frame.
  • the channel measurement report frame includes the channel state information of the m target APs and the identifiers of the m target APs among the n APs.
  • the channel measurement report frame is also used to indicate that the m target APs are Check to participate in collaborative transmission.
  • the channel measurement report frame may be a beamforming report frame, and the channel state information may be carried in a beamforming report field included in the beamforming report frame.
  • the channel state information can be compressed channel characteristics or uncompressed channel characteristics.
  • the channel state information may be: a compressed beamforming report, or an uncompressed beamforming report. Using compressed form of feedback can further reduce the overhead of channel state information feedback.
  • the STA can select m target APs participating in coordinated transmission. Subsequently, the STA may send a channel measurement report frame including identification information and channel state information of the target APs to the selected m target APs to notify the m APs that they are selected to participate in the coordinated transmission.
  • the STA sends a channel measurement report frame, where the channel measurement report frame includes the identification information of the target AP (including AP1 and AP2), and the channel state information of AP1 and AP2, and the channel measurement report frame
  • the STA may send m channel measurement report frames sequentially in a unicast manner, and one channel measurement report frame carries the channel measurement result and identifier of a target AP.
  • the AP that receives the channel measurement report frame can determine that it is selected to participate in coordinated transmission, and can obtain corresponding channel state information from the channel measurement report frame.
  • the STA may send the channel measurement report frame by broadcasting, where the channel measurement report frame includes the channel measurement results of m target APs and the identification information of m target APs, and accordingly, the broadcast channel measurement report is received
  • the AP of the frame can determine whether it is selected based on the identification information in the channel measurement report frame. Specifically, if the AP successfully matches its own identification information with the identification information in the channel measurement report frame, it can be determined to be selected, and the AP can obtain the corresponding channel state information from the report frame; accordingly, if its own identification information If it fails to match the identification information in the channel measurement report frame, the AP is an AP that has not been selected to participate in cooperative transmission, and may be called a non-target AP.
  • the following is a detailed description of how the channel measurement report frame is used in unicast and broadcast to notify the AP whether it is selected:
  • the sending mode of the channel measurement report frame is unicast.
  • the STA may feed back their channel measurement report frames to m target APs, and the channel measurement report frames include identification information of the target APs and channel state information.
  • the STA can send a channel measurement report frame to AP1, and the destination address of the frame is the address information of AP1.
  • the address information may be MAC address information.
  • AP1 listens to the channel measurement report frame, it recognizes that the address information of the channel measurement report frame (that is, the identification information of the target AP described in the embodiment of this application) matches the local address information of AP1, then AP1 receives the Channel measurement report frame, and it is recognized that the channel measurement report frame includes the channel state information of AP1, then AP1 can determine that it is the target AP selected to participate in cooperative transmission while obtaining the channel state information.
  • the address information in the channel measurement report frame may be the identification information of the AP described in this application, that is, when the AP recognizes that the identification information matches the local identification information (that is, the local address information), And when the channel state information is included in the frame, it can be determined that it is the selected target AP.
  • the channel measurement report frame may also carry other identification information that can identify AP1 in addition to address information, for example: Association Identifier (AID).
  • AID Association Identifier
  • AP1 can determine whether it is selected as the target AP by identifying whether the AID of AP1 and the corresponding channel state information are included in the channel measurement report frame.
  • the STA may send a channel measurement report frame to AP2, the destination address of which is AP2's address information, and the channel measurement report frame includes AP2's channel state information to notify AP2 that it is selected to participate in cooperative transmission.
  • the STA may not feed back the channel measurement report frame to the non-target AP. Notify that non-target APs are not selected to participate in cooperative transmission. That is to say, in this embodiment, if the AP does not receive the channel measurement report frame at the specified time, it can determine that it has not been selected for parameter cooperative transmission.
  • the designated time can be the predetermined duration for the AP to send the NDP frame, and the predetermined duration can be set according to actual needs. For example, it can be SIFS, which is not limited in this application, or the designated time can also be the NDP frames of all APs. After the scheduled time is sent, the designated time can be set according to actual needs, and this application is not limited.
  • the channel measurement report frame may be a beamforming report frame, and the beamforming report frame includes, but is not limited to: a MIMO control field and a beamforming report field.
  • the channel state information can be carried in the beamforming report field.
  • the MIMO control field may include information used to indicate that the type of channel state information fed back by the STA is selective feedback.
  • this information may be carried in the feedback type field in the MIMO control field.
  • a preset value can be set in the feedback type field to indicate the information.
  • the parameter value in the feedback type field can be set to 3 to indicate that the current feedback type is selective feedback.
  • the selective feedback mentioned in this application means that the STA selects the target AP, and the STA only feeds back channel state information to some APs, for example, the target AP (selected AP).
  • non-selective feedback is other feasible feedback methods, for example, a feedback method in which the STA feeds back channel state information to each of the n APs participating in channel sounding.
  • AP1, AP2, and AP3 participate in channel detection
  • non-selective feedback is: STA needs to feed back channel state information to AP1, AP2, and AP3.
  • the selective feedback in this application is that the STA can feed back channel state information to AP1 and AP2, but not to AP3.
  • the value of the feedback type field in the MIMO control field can be 0, 1, 2, or 3. Among them, 0, 1, and 2 are already occupied.
  • This application can use a value of 3 to indicate that the feedback type is selective feedback, or use other fields in the MIMO control field or reserved bits to indicate that the feedback type is selective feedback. The application is not limited.
  • the STA After the STA obtains the channel state information of the AP, it generates a channel measurement report frame.
  • the destination address in the channel measurement report frame is a broadcast address, which can further reduce channel occupation and save channel overhead by broadcasting.
  • the channel measurement report frame may include identification information of the target AP and channel state information.
  • the AP that receives the channel measurement report frame may match the local identification information with the identification information carried in the frame to determine whether it is the target AP. For example, if the matching is successful, you can determine that you are the target AP, and extract the corresponding channel state information. Conversely, if the matching fails, it can be determined that it is a non-target AP and has not been selected to participate in cooperative transmission.
  • the identification information of the AP may be carried in the MIMO control field, or the MIMO control field and the beamforming report field, or the beamforming report field.
  • the identification information of the AP may also be carried in other frames sent before the channel measurement report frame, and the AP identification information may be an order indication of the AP, which is used to indicate the position of the field belonging to each AP in the beamforming report frame , The AP can determine the position of its own beamforming report field in the channel measurement report frame according to the AP's order instruction, so as to obtain its own channel state information.
  • AP identification information or AP sequence indication may be carried in an NDPA frame or a channel measurement report trigger frame.
  • the channel measurement report frame may include multiple STA information fields (or may be referred to as AP information fields), and each STA information field has a one-to-one correspondence with the target AP.
  • AP identification information and channel state information can be carried in the STA information field, for example: AP1 identification information and channel state information can be carried in STA information field 1, AP2 identification information and channel state information can be carried In the STA information field 2.
  • the AP can determine that the channel state information carried in the field is the required channel state information by reading the identification information in the STA field, and obtain it locally.
  • the identification information and channel state information of each AP in the channel measurement report frame can also be distinguished by a separator.
  • the method for isolating the identification information and channel state information of different APs in the broadcast channel measurement report frame is not limited to the foregoing isolation method, and is not limited in this application.
  • the AP and the STA may also exchange feedback type indications, so that both the AP and the STA know the feedback type.
  • an AP referring to the main AP, such as AP1, or any AP, which is not limited in this application
  • the feedback type indication may also be sent by the STA, which is not limited in this application.
  • the feedback type indication may be carried in the announcement frame.
  • the announcement frame can be sent at any time before the STA feedbacks the channel measurement report frame.
  • the announcement frame may include a feedback type indication field for carrying the feedback type indication.
  • the length of the feedback type indication field may be 2 bits.
  • the corresponding value of the feedback type indication and its indication function are shown in Table 1. Of course, the different indication functions corresponding to different values of the feedback type can be changed.
  • the frame structure of the declaration frame is shown in Fig. 5.
  • the declaration frame also includes but is not limited to: frame control field, receiving address field (or destination address field), Send address field and other fields.
  • the feedback type indication may also be carried in the channel measurement report trigger frame sent by the AP (or may refer to the master AP, for example, AP1).
  • the channel measurement report trigger frame may include a feedback type field, and the feedback type indication may be carried in the feedback type field.
  • Fig. 6 is a schematic diagram of the frame structure of the trigger frame, where the length and parameter settings of the feedback type field can refer to the feedback type field in the declaration frame, which will not be repeated here.
  • the trigger frame also includes other fields (for example: frame control field, receiving address field, sending address indication field, etc., which will not be repeated in this application).
  • the feedback type indication may also be carried in the NDPA frame.
  • the feedback type indication may be carried in the STA information field in the NDPA frame to indicate that the feedback mode adopted by the STA corresponding to the STA information field is selective feedback.
  • Figure 7 is a schematic diagram of the frame structure of the NDPA frame in this application.
  • the NDPA contains multiple STA information fields, corresponding to STA1, STA2, and STA3 (not shown in the figure in this application), and STA1 corresponds to the STA
  • the information field contains a feedback type indication field, the length of this field can be 2 bits, and the parameter value setting can refer to Table 2, which will not be repeated here.
  • FIG. 8 is a schematic flowchart of a channel detection method in an embodiment of the application.
  • Step 201 n APs send channel sounding frames to STAs.
  • Step 202 The STA performs channel sounding on the channels of n APs to obtain channel state information.
  • Step 203 The STA selects m target APs from n APs according to the channel state information.
  • Step 204 The STA sends a channel measurement report frame.
  • the channel measurement report frame includes the channel state information of m target APs among the n APs and the identifiers of the m target APs.
  • the channel measurement report frame is also used to indicate that m target APs are selected. Participate in collaborative transmission.
  • Step 205 The STA sends an indication frame, indicating that the channel state information of (n-m) non-target APs is not included in the indication frame.
  • the STA may indicate that m target APs are selected to participate in coordinated transmission through the channel measurement report frame.
  • the STA may also send an indication frame, which is used to indicate that (n-m) non-target APs are not selected to participate in coordinated transmission.
  • the STA sends a channel measurement report frame including the identification information of AP1 and AP2 and channel state information, and the STA sends an indication frame, indicating that the channel of the non-target AP (AP3) is not included in the frame status information.
  • the indication frame may only include a frame with a simple frame structure including destination address, sending address, and feedback type fields.
  • the structure of the indication frame may be as shown in FIG. 9 to further save channel overhead.
  • STA sends the indication frame to AP3, AP3 receives the indication frame, and recognizes that the indication frame does not contain channel state information, then it is determined that AP3 is not selected to participate in cooperative transmission.
  • the indication frame may also have the same frame structure as the channel measurement report frame, for example, both are beamforming report frames.
  • the channel measurement report field of the channel measurement report frame of the non-target AP does not include channel state information.
  • STA sends a channel measurement report frame, where the channel measurement report frame sent to AP1 and AP2 includes channel state information, and the channel measurement report frame sent to AP3 does not carry channel state information. Then, after AP3 recognizes that the channel measurement report frame does not carry the channel state information of AP3, it determines that it has not been selected to participate in cooperative transmission.
  • the information carried in the indication frame and the information carried in the channel measurement report frame can be combined into one beamforming report frame and sent.
  • the beamforming report frame sent by the STA to the non-target AP includes a MIMO control field, but does not include a beamforming report field for carrying channel state information.
  • the beamforming report frame sent by the STA to the non-target AP may include a MIMO control field and a beamforming report field, where the beamforming report field is empty, so that this type of beamforming that does not include channel state information is received The AP reporting the frame determines that it has not been selected to participate in cooperative transmission.
  • the beamforming report frame used in this application may include: a MIMO control field, a beamforming report field, and a selection information field.
  • the MIMO control field can be used to carry the control information of the AP.
  • Control information includes but is not limited to: bandwidth, number of transmitting antennas, number of receiving antennas, etc.
  • the MIMO control field may be as shown in FIG. 2 for example.
  • the beamforming report field includes but is not limited to: channel state information, etc.
  • the selection information field includes, but is not limited to: unselected indication information and/or channel quality information (SNR, RSSI, and/or channel correlation, etc.).
  • the beamforming report frame may also include, but is not limited to: a category field, which is used to identify the type of beamforming report frame, and an action indication field, which is used to indicate that the beamforming report frame is sent, and the AP does not need to reply to a response frame.
  • the information carried in the indication frame and the information carried in the channel measurement report frame can also be combined into one beamforming report frame and sent out.
  • the possible fields and meanings included in the beamforming report frame may be as shown in Table 2 or Table 3. It should be noted that for different feedback forms, the beamforming report frame may not include all the fields in Table 2 or Table 3, but may adaptively include some of the fields.
  • the difference between Table 2 and Table 3 is that when the frame structure in Table 2 is adopted, the beamforming report frame includes one or more MIMO control fields, and each MIMO control field corresponds to the AP one to one, that is, one MIMO The control field includes control information of the corresponding AP.
  • the beamforming report frame includes a MIMO control field, which carries control information of all APs.
  • the structure of the beamforming report frame of the non-target AP may be as shown in FIG. 10.
  • the beamforming report frame includes the MIMO control field of AP3 in Table 2, which is used to carry the control information of AP3.
  • AP3 receives the beamforming report frame and recognizes that the beamforming report frame does not carry the beamforming report field, that is, it does not carry channel state information. Then, AP3 determines that it has not been selected to participate in cooperative transmission.
  • the beamforming report frame of the non-target AP may further include a MIMO control field and a beamforming report field, where the beamforming report field is empty, that is, does not include channel state information.
  • AP3 receives the beamforming report frame, and recognizes that the beamforming report field in the beamforming report frame does not include channel state information, then AP3 determines that it has not been selected to participate in cooperative transmission.
  • the beamforming report frame further includes the category field and the action indication field in Table 2.
  • the beamforming report frame sent by the STA may include the MIMO control field and beamforming report field of the target AP, and the MIMO control field of the non-target AP .
  • the frame structure of the beamforming report frame can also be as shown in FIG. 11.
  • the beamforming report frame includes the MIMO control field of AP1 (that is, the MIMO control field 1 in the figure) and the beamforming report field (that is, the beamforming report field 1 in the figure), and the MIMO control field of AP2 (that is, the MIMO control field in the figure).
  • the identification information of the AP can be carried in the MIMO control field and the beamforming report field.
  • AP1, AP2, and AP3 can obtain their corresponding fields by matching their identification information.
  • AP1 and AP2 can identify and obtain information in the MIMO control field and the beamforming report field.
  • AP3 does not recognize the beamforming report field of AP3, that is, if the channel state information is not obtained, AP3 may determine that it is not selected, and AP3 may obtain control information in the MIMO control field.
  • the identification information of the AP can also be carried in the MIMO control field instead of the beamforming report field.
  • the AP can obtain the corresponding MIMO control field by matching the identification information in the MIMO control field, and determine the following
  • the adjacent field of the MIMO control field is its own beamforming report field, or it can be that the AP is its own field before reading the next field containing the identification information of other APs, for example, as shown in Figure 12
  • the MIMO control field 1 includes the identification information of AP1. Based on the identification information, AP1 can determine that the MIMO control field 1 corresponds to AP1, obtain the control information therein, and continue to read the following beamforming report fields.
  • the identification information of the AP can also be carried in other frames sent before the channel measurement report frame to instruct the corresponding AP to obtain channel measurement according to the sequence of the AP identification information Fields of their own in the report frame.
  • the AP identification information may be carried in the NDPA frame or the channel measurement report trigger frame.
  • the beamforming report frame may also include the MIMO control field and the beamforming report field of the target AP, and the MIMO control field and the beamforming report field of the non-target AP, where the beamforming report field of the non-target AP is empty. .
  • APs may also share one MIMO control field, that is, the control information of AP1, AP2, and AP3 may be carried in the MIMO control field.
  • the identification information of the AP can be carried in the MIMO control field corresponding to the control information.
  • the AP can identify the identification information to determine the field after the identification information (the field before the next identification information) as its own control information . For example, refer to Figure 13 for the frame structure of the beamforming report frame.
  • the beamforming report frame includes the MIMO control field of the AP, the beamforming report field of AP1 (ie, the beamforming report field 1 in the figure), and the beamforming of AP2 Report field (ie, beamforming report field 2 in the figure).
  • AP1, AP2, and AP3 can read the MIMO control field to obtain their respective control information, where AP3 does not recognize the corresponding beamforming report field, that is, AP3 does not obtain the corresponding channel state information, then AP3 Make sure it is not selected.
  • the identification information of the AP may also be carried in other frames sent before the channel measurement report frame, and the AP may obtain its own fields in the channel measurement report frame according to the sequence indicated by the AP identification information.
  • the STA may also compress the channel measurement report frame (for example, the beamforming report frame) to further reduce the channel overhead.
  • the STA compresses the beamforming report through a general or proprietary algorithm. Common algorithms include but are not limited to: Moving Picture Experts Group (MPEG)-2, MPEG-4, H.264, Request For Comments (RFC) 1951, RFC 1952 and other algorithms.
  • the specific compression method can refer to the existing technology, which is not limited in this application.
  • the STA may send a compression indication field, which is used to indicate that the beamforming report field is compressed.
  • the compression indication field may be included in the beamforming report frame.
  • the AP may decompress the compressed beamforming report field based on the indication of the compression indication field to obtain a beamforming report frame.
  • the NDPA frame sent by the AP may include a compression indication for notifying other APs that the beamforming report is compressed, and for notifying the STA to compress the beamforming report.
  • the compression indication may be carried in the feedback type field in the NDPA frame.
  • the foregoing method of compressing frames may also be applied to point-to-point transmission, for example, a signaling interaction process between STA and STA.
  • step 204 and step 205 can be executed simultaneously or sequentially, and the execution order is not limited.
  • the STA may first perform step 204 to send a channel measurement report frame to the target AP, and then perform step 205 to send an indication frame to the non-target AP; or, the STA may first perform step 205 and then perform step 204; or, the STA Step 204 and step 205 can be performed simultaneously.
  • the STA may send a channel measurement report frame to notify the target AP that it is selected to participate in cooperative transmission.
  • the STA does not send the channel state information of the unselected non-target AP, which is used to notify the non-target AP that it has not been selected to participate in cooperative transmission.
  • the STA can also send an indication frame that does not carry channel state information to the non-target AP to notify the non-target AP that it has not been selected to participate in the coordinated transmission, thereby providing a channel detection method performed by the STA for the cooperative AP selection, and the STA Channel state information can be selectively fed back to effectively save channel overhead, improve resource utilization, and realize the selection of cooperative APs.
  • FIG. 15 is a schematic flowchart of the channel detection method in an embodiment of the application, and in FIG. 15:
  • Step 301 n APs send channel sounding frames to the STA.
  • Step 302 The STA performs channel detection on the channels of n APs to obtain channel state information.
  • Step 303 The STA selects m target APs from n APs according to the channel state information.
  • the STA sends a channel measurement report frame.
  • the channel measurement report frame includes the channel state information of m target APs among the n APs and the identifiers of the m target APs.
  • the channel measurement report frame is also used to indicate that the m target APs are Check to participate in collaborative transmission.
  • Step 305 The STA sends indication information, and the indication information includes channel quality information or unselected indication information.
  • the STA may indicate that m target APs are selected to participate in coordinated transmission by sending a channel measurement report frame.
  • the STA may indicate that m target APs are selected to participate in coordinated transmission by sending a channel measurement report frame.
  • the method of sending the channel measurement report frame by the STA please refer to step 104, which is not repeated here.
  • the STA may also send indication information, which is used to indicate that (n-m) non-target APs are not selected to participate in coordinated transmission.
  • the indication information may be carried in the beamforming report frame.
  • the indication information may also be carried in an indication frame.
  • the indication frame has a simple frame structure, including: a sending address, a receiving address, and an indication field (the indication field carries the indication information).
  • the STA sends a channel measurement report frame including the identification information of AP1 and AP2 and channel state information to indicate that AP1 and AP2 are selected as the target APs participating in cooperative transmission, and the STA sends Indication information, the indication information includes AP3 channel quality information or unselected indication information, and is used to indicate that AP3 is not selected to participate in coordinated transmission.
  • the indication information may include channel quality information for the non-target AP to recognize that the indication information only carries channel quality information but does not carry the channel state information requested by the AP, and it can be determined that the AP is not selected to participate in cooperative transmission .
  • the channel quality information can also reflect the quality of the channel. Accordingly, the AP can determine the channel quality between it and the STA based on the channel quality information.
  • the channel quality information may be indicators such as RSSI, SNR, and channel correlation.
  • the bit length occupied by the channel quality information is less than the bit length occupied by all channel state information required by the AP, thereby further saving channel overhead.
  • the indication information may also include non-selection indication information, which is used when the non-target AP recognizes that the indication frame includes the non-selection indication information, and can determine that the AP is not selected to participate in cooperative transmission.
  • the length of the indication information can be 1 bit, thereby further saving channel overhead.
  • the beamforming report frame may include two forms:
  • One beamforming report frame can carry information of multiple APs.
  • One beamforming report frame only carries information of one AP.
  • the beamforming report frame may include the channel state information of AP1 and AP2, and the indication information of AP3, which is used for AP1 and AP2 to determine the selected target AP after recognizing the channel state information, And after AP3 recognizes the indication information, it is determined as a non-target AP that has not been selected.
  • the beamforming report frame includes a selection information field.
  • the indication information may be carried in the selection information field for AP3 to determine that it is not selected after identifying the selection information field.
  • the beamforming report frame may be as shown in FIG. 16.
  • the beamforming report frame includes a selection information field, which may include the identification information of AP3 and the indication information. After AP3 successfully matches the local identification information with the identification information in the selection information field, it reads the indication information in this field. If the indication information is channel quality information, for example, RSSI, AP3 can obtain the result. If the indication information is the unselected indication information, AP3 determines that it is not selected.
  • the beamforming report frame also includes the MIMO control field and beamforming report field of AP1, the MIMO control field and beamforming report field of AP2, and the MIMO control field of AP3.
  • the beamforming report frame may also be as shown in FIG. 17, wherein the identification information of the AP may be carried in the MIMO control field, but not carried in the beamforming report field and selection information field.
  • the frame structure is similar to that of FIG. 12. For related description, refer to the content of FIG. 12, which is not repeated here.
  • the channel measurement report frames of each AP can be independent of each other.
  • the channel measurement report frame of AP1 includes AP1 identification information and channel state information, but does not include other AP information.
  • AP3's beamforming report may include a selection information field.
  • the function of the selection information field is as described above, and will not be repeated here.
  • the frame structure of the beamforming report frame may be as shown in FIG. 18.
  • the field may also include other fields such as the MIMO control field of AP3.
  • step 304 and step 305 can be executed simultaneously or sequentially, and the execution order is not limited.
  • FIG. 19 is a schematic flowchart of the channel detection method in an embodiment of the application, and in FIG. 19:
  • Steps 401 to 404 can refer to the steps in scenario 1 or scenario 2, which will not be repeated here.
  • Step 405 The target AP and the STA receive the first data sent by the master AP.
  • the main AP may be one of m target APs, or may not be the target AP, for example, the main AP may be AP1 in FIG. 3.
  • the master AP shares the first data with the target AP, and at the same time, the STA may also receive the first data shared by the master AP. Wherein, if the STA successfully receives the first data, step 406 is entered. If the STA fails to receive the first data, step 407 is entered.
  • step 406 the STA sends a reception success response frame.
  • the STA may send a reception success response frame to the master AP, or to the master AP and other target APs, to inform the master AP that the master AP and other target APs successfully receive the first data.
  • the master AP or the master AP and other target APs can delete the cached first data, thereby reducing the pressure on the device.
  • Step 407 The STA sends a retransmission request frame to p retransmission APs among the m target APs, and the retransmission request frame is used to instruct the p retransmission APs to retransmit the first data.
  • the STA can select p retransmission APs from the m target APs, and send a retransmission request frame to the p retransmission APs, the retransmission request The frame is used to instruct the retransmission AP to retransmit the first data to the STA.
  • the STA can select the master AP (for example, AP1 in FIG. 3) as the retransmission AP.
  • the STA sends a retransmission request frame to the master AP to instruct the master AP to retransmit the first data.
  • the STA can choose a target AP other than the main AP or the AP that sent the first data last time as the retransmission AP.
  • the number of retransmission APs may be greater than or equal to 1 and less than or equal to m.
  • the STA may refer to a preset rule for selecting p retransmission APs.
  • the preset rule may be: selecting p APs with the best channel status from m target APs, etc., which is not limited in this application.
  • the retransmission request frame includes but is not limited to: retransmission mode field, retransmission AP information field, and/or sending address indication field.
  • the retransmission mode field can be used to indicate whether the retransmission AP uses joint transmission to retransmit the first data.
  • setting 1 in the retransmission mode field may indicate joint transmission, and setting 0 may indicate non-joint transmission.
  • the retransmission request frame may also include a sending address indication field, which is used to instruct to retransmit the address information carried in the first data sent by the AP.
  • the sending address indication field is the address information of the AP that sent the first data last time.
  • the address information may be MAC address information.
  • the retransmission request frame may also include a destination address field (or may be called a receiving address field (Receiving Address, RA)) and a retransmission AP information field, where the destination address field is the broadcast address or the retransmission AP’s Address information; the retransmission AP information field may include the identification information of the retransmission AP.
  • the identification information may be information such as the MAC address or AID of the retransmitted AP.
  • the retransmission request frame may not include the retransmission mode field.
  • An AP whose local identification information matches the identification information carried in the retransmission AP information field can be confirmed as a retransmission AP, and jointly transmit the first data with other retransmission APs.
  • the retransmission request frame may not include the retransmission AP information field and/or the retransmission mode field.
  • the AP that receives the retransmission request frame can be confirmed as a retransmission AP, and uses non-joint transmission to retransmit the first data.
  • Figure 20 is a schematic diagram of the frame structure of the retransmission request frame. Referring to Figure 20, the retransmission request frame may also include a transmitting address field (Transmitting Address, TA), a frame control field, a duration field, and a frame check sequence (Frame Check Sequence, FCS) etc.
  • TA transmitting Address
  • FCS Frame Check Sequence
  • Step 408 p retransmission APs send the first data.
  • the AP that receives the retransmission request frame resends the first data.
  • the master AP resends the first data to the STA.
  • the AP that received the retransmission request frame is not the AP that sent the first data last time, for example, it is AP2.
  • AP2 identifies whether the retransmission AP information field in the retransmission request frame includes indication information of multiple APs and/or joint transmission indication, and if it includes, AP2 retransmits the first data with other retransmission APs. If not included, AP2 retransmits the first data to the STA.
  • the first data retransmitted by AP2 includes The address information of the AP that sent the first data last time, for example, the address information of AP1.
  • Step 409 The STA decodes the received first data, and obtains the decoded first data.
  • the STA receives the first data sent by the retransmission AP, and decodes the first data to obtain the decoded first data.
  • the STA can compare the first data received this time and the previous time. Perform joint soft decoding to improve decoding accuracy.
  • the STA may perform joint soft decoding on the first data that has the same address information received multiple times. That is, the STA may instruct the AP to retransmit the first data after each failure to receive the first data. Data, and the content of the sending address indication field carried in the retransmission request frame is consistent, which is used to indicate that the first data retransmitted by the AP each time the retransmission request includes the same address information.
  • the STA and/or the AP may send a dynamic AP selection instruction to indicate that the STA dynamically selects the AP to be retransmitted when retransmitting data.
  • the dynamic AP selection indication may be carried in the physical preamble of the physical layer protocol data unit.
  • the physical preamble can be the physical preamble of the NDP sent by the AP, or the physical preamble of the first data, which is not limited in this application.
  • FIG. 21 A schematic diagram of the structure of a physical layer protocol data unit is shown in Figure 21, where the physical preamble may include at least one signaling field (Signaling Field, SIG), and the signaling field may also be called the next generation signaling field.
  • the let field may include an AP collaboration (collaboration) field.
  • the function corresponding to the value of the AP cooperation field may be as shown in Table 4.
  • the cooperative transmission mode in scenario 3 may also be applied to the application scenario shown in FIG. 22.
  • the cooperative transmission mode in scenario 3 may also be applied to other scenarios, and FIG. 22 is only exemplary.
  • AP1 and AP3 perform coordinated transmission to STA1
  • AP2 and AP3 perform coordinated transmission to STA2.
  • AP1 sends the second data to STA1
  • AP2 sends the third data to STA2
  • STA1 can choose AP1, or AP3, or AP1 and AP3 as retransmission APs, and send a retransmission request to the retransmission AP , Instruct the retransmission AP to retransmit the second data.
  • AP2, or AP3, or AP2 and AP3 can also be selected as retransmission APs.
  • scenario 3 which will not be repeated here.
  • AP1 and AP2 may send data at the same time or at different times.
  • AP3 may buffer the second data and third data respectively, and if AP3 is selected by STA1 as the retransmission AP, AP3 retransmits the second data to STA1. If AP3 is selected by STA2 as the retransmission AP, AP3 retransmits the third data to STA2.
  • AP3 may buffer the second data and the third data respectively, or AP3 may also combine the second data and the third data.
  • AP3 retransmits the combined data to STA1. It should be noted that, if it is the combined data, STA1 and/or STA2 need to use an exclusive OR method to decode the combined data, and also obtain the second data or the third data.
  • the STA and the AP include hardware structures and/or software modules corresponding to the respective functions.
  • the embodiments of the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present invention may divide the AP and the STA into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiment of the present invention is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 23 shows a possible schematic structural diagram of the communication device 100 on the STA side involved in the foregoing embodiment.
  • the device 100 may include: The transceiver module 11 and the acquisition module 12.
  • the transceiver module 11 may be used to support the STA to perform “receive channel sounding frames sent by n APs”. For example, it may support the STA to perform step 102, step 202, step 302, and step 402 in the foregoing embodiment.
  • the transceiver module 11 may also be used to support the STA to perform the step of "sending a channel measurement report frame".
  • the transceiver module 11 may also be used to support the STA to perform the step of "sending an indication frame", for example, it may support the STA to perform step 205, step 305, and step 405 in the foregoing embodiment.
  • the transceiver module 11 may also be used to support the STA to perform the step of "sending or receiving feedback type indication".
  • the transceiver module 11 may also be used to support the STA to perform the step of "receiving the first data sent by the main AP", for example, it may support the STA to perform step 405 in the above-mentioned embodiment.
  • the transceiver module 11 can also be used to support the STA to perform the step of "if the first data reception fails, send a retransmission request frame to p retransmission APs out of m target APs", for example, it can support the STA to perform the above implementation Step 407 in the example.
  • the transceiver module 11 may also be used to support the STA to perform the step of "receiving the retransmitted first data retransmitted by the AP".
  • it may support the STA to perform step 409 in the foregoing embodiment.
  • the acquisition module 21 can be used to support the STA to perform the step of "channel detection based on the channel sounding frame and obtain the channel state information of each AP". For example, it can support the STA to perform step 102, step 202, step 302, Step 402.
  • the device 100 may further include a decoding module 13, which may be used to support the STA to perform joint soft decoding based on the first data retransmitted by the AP and the first data sent by the main AP.
  • the step of acquiring the decoded first data may support the STA to perform step 408 in the above-mentioned embodiment.
  • FIG. 24 shows a schematic block diagram of another STA-side communication apparatus 200 according to an embodiment of the present application.
  • the apparatus 200 in the embodiment of the present application may be the STA in the foregoing method embodiment, and the apparatus 200 may be configured to perform part or all of the functions of the STA in the foregoing method embodiment.
  • the device 200 may include a processor 21, a baseband circuit 23, a frequency circuit 24, and an antenna 25.
  • the device 200 may further include a memory 22.
  • the components of the device 200 are coupled together via a bus 26, where the bus 26 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are marked as the bus system 26 in the figure.
  • the processor 21 may be used to control the STA, to perform the processing performed by the STA in the foregoing embodiment, and may perform the processing procedure involving the STA in the foregoing method embodiment and/or other procedures used in the technology described in this application. It can also run the operating system, manage the bus, and execute the programs or instructions stored in the memory.
  • the baseband circuit 23, the radio frequency circuit 24, and the antenna 25 may be used to support the sending and receiving of information between the STA and the AP or the station involved in the foregoing embodiment, so as to support wireless communication between the STA and other nodes.
  • the signaling or data generated after being encoded by the baseband circuit 23 and encapsulated according to the protocol is processed by the radio frequency circuit such as analog conversion, filtering, amplification, and up-conversion, and then sent to the AP via the antenna 25.
  • the channel detection frame sent from the AP is received via the antenna 25, filtered, amplified, down-converted, and digitized by the radio frequency circuit 24, and then decoded by the baseband circuit 23, and after baseband processing such as unpacking data according to the protocol ,
  • the processor 21 performs processing to restore the service data and signaling information sent by the site.
  • the baseband circuit 23, the radio frequency circuit 24, and the antenna 25 may also be used to support the STA to communicate with other network entities, for example, to support the STA to communicate with the network element on the core network side.
  • the memory 22 may be used to store the program code and data of the STA. Those skilled in the art can easily understand that the memory 22 or any part thereof may be located outside the apparatus 200.
  • the memory 22 may include a transmission line and/or a computer product separated from the wireless node, and these media can be accessed by the processor 21 through the bus interface 26.
  • the memory 22 or any part thereof may be integrated into the processor 21, for example, may be a cache and/or a general-purpose register.
  • FIG. 24 only shows a simplified design of the STA.
  • an STA may include any number of transmitters, receivers, processors, memories, etc., and all STAs that can implement the present invention are within the protection scope of the present invention.
  • FIG. 25 is a schematic block diagram of an apparatus 300 on the access point side according to an embodiment of the application.
  • the device 300 shown in FIG. 25 may correspond to the device on the AP side in the foregoing method embodiment, and may have any function of the AP in the method.
  • the device 300 in the embodiment of the present application may be The AP can also be a chip in the AP.
  • the device 300 may include a transceiver module 31 and a processing module 32.
  • the device 300 may also include a storage module 33.
  • the storage module 33 may be used to cache all or part of the first data.
  • the transceiver module 31 may include a receiving module and a sending module.
  • the receiving module may be used to receive the data sent by the STA in step 104, step 204, step 304, step 404, step 405, and step 406 in the foregoing method embodiment.
  • the sending module can be used to send the signaling or data in step 101, step 201, step 301, step 401, step 405, and step 408 in the foregoing embodiment.
  • the processing module 32 may be used to perform the relevant steps of determining whether the STA is selected to participate in coordinated transmission based on the feedback information of the channel state information in the foregoing method embodiment.
  • the device 300 may correspond to the AP in the various methods of the foregoing embodiments, and the above-mentioned and other management operations and/or functions of the various modules in the device 300 are used to implement the corresponding methods of the foregoing various methods. The steps are not repeated here for the sake of brevity.
  • FIG. 26 shows a schematic block diagram of another AP-side communication device 400 according to an embodiment of the present application.
  • the apparatus 400 in the embodiment of the present application may be the AP in the foregoing method embodiment, and the apparatus 400 may be used to perform part or all of the functions of the AP in the foregoing method embodiment.
  • the device 400 may include a processor 41, a baseband circuit 43, a radio frequency circuit 44, and an antenna 45.
  • the device 400 may further include a memory 42.
  • the various components of the device 400 are coupled together through a bus 46, where the bus system 46 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are marked as the bus system 46 in the figure.
  • the processor 41 may be used to control the AP, to execute the processing performed by the AP in the foregoing embodiment, and may execute the processing procedure related to the AP in the foregoing method embodiment and/or other procedures used in the technology described in this application. It can also run the operating system, manage the bus, and execute the programs or instructions stored in the memory.
  • the baseband circuit 43, the radio frequency circuit 44, and the antenna 45 can be used to support the AP and the STA or AP involved in the foregoing embodiments to send and receive information, so as to support wireless communication between the AP and other nodes.
  • the signaling or data sent from the STA such as the channel measurement report frame, is received via the antenna 45, filtered, amplified, down-converted, and digitized by the radio frequency circuit 44, and then decoded and pressed by the baseband circuit 43.
  • the processor 41 After baseband processing such as protocol decapsulation data, the processor 41 performs the processing to restore the service data and signaling information sent by the station; in another example, the cooperation response message sent by the AP can be processed by the processor 41 via the baseband circuit 43
  • the radio frequency circuit 44 After performing baseband processing such as encapsulation and encoding according to the protocol, the radio frequency circuit 44 further performs radio frequency processing such as analog conversion, filtering, amplification, and up-conversion, and then sends it to the STA via the antenna 45.
  • the baseband circuit 43, the radio frequency circuit 44, and the antenna 45 may also be used to support the AP to communicate with other network entities, for example, to support the AP to communicate with the network element on the core network side.
  • the memory 42 may be used to store program codes and data of the AP, and the memory 42 may be the storage module 33 in FIG. 25.
  • the memory 42 in FIG. 26 is shown as being separated from the processor 41. However, those skilled in the art can easily understand that the memory 42 or any part thereof may be located outside the device 400.
  • the memory 42 may include a transmission line and/or a computer product separated from the wireless node, and these media may be accessed by the processor 41 through the bus interface 46.
  • the memory 42 or any part thereof may be integrated into the processor 41, for example, may be a cache and/or a general-purpose register.
  • Figure 26 only shows a simplified design of the AP.
  • an AP may include any number of transmitters, receivers, processors, memories, etc., and all APs that can implement the present invention are within the protection scope of the present invention.
  • An embodiment of the present application also provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and the instructions may be executed by one or more processors on a processing circuit. When it runs on a computer, it makes the computer execute the methods described in the above aspects.
  • the computer storage medium is a non-volatile readable storage medium.
  • the embodiments of the present application also provide a chip system, which includes a processor for supporting STA or AP to realize the functions involved in the above embodiments, for example, generating or processing data and/or data involved in the above methods information.
  • the chip system may further include a memory, and the memory is used to store program instructions and data necessary for STA or AP.
  • the chip system may be composed of a chip, or may include a chip and other discrete devices.
  • the processor is used to execute the program instructions, so that the communication device in which the chip system is installed realizes the AP or STA involved in any of the above embodiments.
  • the memory may be located outside the processor and be an external storage medium, or located inside the processor and be an internal storage medium of the processor.
  • the embodiment of the present application also provides a processor, which is configured to be coupled with a memory and used to execute the method and function related to the STA in any of the foregoing embodiments.
  • the embodiments of the present application also provide a processor, which is configured to be coupled with a memory and used to execute methods and functions related to the AP in any of the foregoing embodiments.
  • the embodiment of the present application also provides a chip, including a processing circuit and an input-output circuit.
  • the input-output circuit is used to input signaling or data to the processing circuit and is also used to output signaling or data generated by the processing circuit.
  • the processing of signaling or data is implemented, so that the communication device on which the chip is installed can implement the method and function involving the STA in any of the foregoing embodiments.
  • the embodiment of the present application also provides a chip, including a processing circuit and an input-output circuit.
  • the input-output circuit is used to input signaling or data to the processing circuit and is also used to output signaling or data generated by the processing circuit.
  • the processing of signaling or data is implemented, so that the communication device installed with the chip can implement the methods and functions related to the AP in any of the foregoing embodiments.
  • the embodiment of the present application also provides a computer program product containing instructions, which when running on a computer, enables the computer to execute the method and function related to the STA in any of the foregoing embodiments.
  • the embodiments of the present application also provide a computer program product containing instructions, which when running on a computer, causes the computer to execute the methods and functions related to the AP in any of the foregoing embodiments.
  • An embodiment of the present application also provides a wireless communication system, which includes at least one STA and at least one AP involved in the foregoing embodiment.
  • the steps of the method or algorithm described in combination with the disclosure of the embodiments of the present invention may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions.
  • Software instructions can be composed of corresponding software modules, which can be stored in random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read Only Memory, ROM), and erasable programmable read-only memory ( Erasable Programmable ROM (EPROM), Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art.
  • RAM Random Access Memory
  • ROM read-only memory
  • EPROM Erasable Programmable ROM
  • EPROM Electrically Erasable Programmable Read-Only Memory
  • register hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium may also be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the ASIC can be located in the AP.
  • the processor and the storage medium may also exist in the AP as discrete components.
  • the functions described in the embodiments of the present invention can be implemented by hardware, software, firmware, or any combination thereof.
  • these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium.
  • the computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another.
  • the storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

Abstract

本申请实施例提供了一种信道探测方法及装置，涉及通信领域，该方法包括：站点STA接收多个接入点AP发送的信道探测帧；STA基于信道探测帧进行信道探测，获取每个AP的信道状态信息；STA发送信道测量报告帧，信道测量报告帧包括多个AP中的部分AP的信道状态信息和这部分AP的标识，信道测量报告帧还用于指示这部分AP被选中参与协作传输。利用信道测量报告帧指示被选中参与协作传输的AP，既可反馈信道状态信息，又节省了信令开销。

Description

信道探测方法及装置
本申请要求在2019年7月16日提交中国专利局、申请号为201910640313.6、发明名称为“信道探测方法及装置”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
本申请实施例涉及通信领域，尤其涉及一种信道探测方法及装置。
背景技术
随着无线网络的发展以及无线局域网(Wireless Local Area Network，WLAN)技术的不断普及，使WLAN设备的部署变得越来越密集。由于无线接入点(Access Point，AP)易于部署的特点，因此，AP的应用频率也越来越高。但是，随着AP部署的密度越来越大，同样也带来了小区间干扰的问题。如何通过AP之间的协作来降低小区间干扰，提升用户的服务质量，成为亟需解决的问题。
AP之间的协作的前提是基于信道状态信息，建立协作关系。在已有技术中，对于AP的信道探测可参照802.11ac的信道探测(Sounding)过程，如图1所示。具体的，AP首先发送空数据分组声明(Null Data Packet Announcement,NDPA)帧通知需要进行信道探测的站点(Station，STA)，及相关信道探测的参数，然后在隔短帧间距(Short Inter-frame Space,SIFS)之后，广播NDP帧，其中，NDP帧中不携带数据字段部分。STA则可基于接收到的NDP对AP进行信道估计，并生成波束成形报告(Beamforming Report,BFR)。随后，AP向STA发送波束成形报告轮询(BF Report Poll，BFRP)以向一个或多个STA索取尚未反馈或者反馈错误的信道状态信息。
在802.11ax中，引入了多用户上行传输的机制，AP可指示多个STA同时上传波束成形报告，以进一步提高信道探测的效率。已有技术中的波束成形报告中包含多输入多输出(Multiple Input Multiple Output，MIMO)控制字段以及波束成型报告字段，其中，MIMO控制字段可包括但不限于：带宽、发送天线数量、接收天线数量等控制信息，例如：MIMO控制字段的结构可如图2所示。
但是，在802.11ac和802.11ax中，均是单AP与多个STA的信道探测方案。对于多个AP的信道探测方式，目前已有的一种技术方案为主AP与从AP发送NDP帧，使STA基于NDP帧进行信道探测，并获取信道状态信息。随后，主AP需要获取到所有AP的信道状态信息，并基于信道状态信息选择协作AP。显然，基于所有AP的信道状态信息选择协作AP，会导致信道状态信息的反馈开销较大，从而效率较低。
发明内容
本申请提供一种信道探测方法及装置，能够实现一种节省信道状态信息反馈开销的协作AP选择方式。
本申请采用如下技术方案：
第一方面，本申请实施例提供了一种信道探测方法，该方法可以包括：STA接收n个AP发送的信道探测帧，其中，n为大于1的整数。接着，STA可基于接收到的信道探测帧对n个AP的信道进行信道探测，并获取每个AP的信道状态信息。以及，STA发送信道测量报告帧，其中，信道测量报告帧包括n个AP中的m个目标AP的信道状态信息和m个目标AP的标识，信道测量报告帧还可用于指示m个目标AP被选中参与协作传输，m为大于1且小于或等于n的整数。
通过上述方式，实现了STA可基于信道状态信息，进行协作AP的选择。并且，STA可通过反馈信道状态信息，以通知AP是否被选中参与协作传输。相应的，AP也可根据是否获取到信道状态信息确认是否被选中参与协作传输。以及，未获取到信道状态信息的AP则可确定其与STA之间的信道状态较差，从而提供了一种节省信道探测反馈开销的AP选择方式。
在一种可能的实现方式中，方法还可以包括：STA发送指示信息，该指示信息可用于指示(n-m)个非目标AP未被选中参与协作传输。
通过上述方式，实现了STA可通过反馈指示信息的方式，通知非目标AP未被选中参与协作传输。
在一种可能的实现方式中，指示信息中可以包括(n-m)个非目标AP的信道质量信息，和，(n-m)个非目标AP的标识；或者，指示信息中可包括未选中指示信息，和，(n-m)个非目标AP的标识，未选中指示信息用于指示(n-m)个非目标AP未被选中，所述信道质量信息用于指示非目标AP与STA之间信道的信道质量。
通过上述方式，实现了STA可通过向非目标AP反馈信道质量信息，或者，向非目标AP反馈未选中指示信息的方式，以通知非目标AP未被选中参与协作传输。区别于已有技术中，需要反馈所有参与信道探测的AP所需的信道状态信息的方式，本申请有效节省了信道开销，提升了资源利用率。
在一种可能的实现方式中，发送信道测量报告帧之前，还包括：STA发送或接收反馈类型指示，反馈类型指示用于指示STA反馈信道状态信息的类型，STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈。
在本申请中，反馈类型指示可以为STA发送的，也可以为AP发送的，STA和/或AP可通过发送反馈类型指示通知STA，或者AP，或者AP和STA将采用由STA进行目标AP的选择，并选择性反馈信道状态信息的反馈方式。
在一种可能的实现方式中，选择性反馈表示STA反馈n个AP中的部分AP的信道状态信息，非选择性反馈表示STA反馈n个AP中的每一个AP的信道状态信息。
通过上述方式，STA和/或AP可在STA反馈之前获知当前的反馈流程是否为选择性反馈。如果是选择性反馈，则AP可在获取到信道状态信息的情况下，确认被选中参与协作传输，并且AP可在未获取到信道状态信息的情况下，确认未被选中。而非选择性反馈的情况下，AP与STA可按照常规的反馈方式进行反馈。
在一种可能的实现方式中，信道测量报告帧包括：多输入多输出控制字段，多输入多输出控制字段的反馈类型字段为预留值，用于指示STA反馈信道状态信息的类型为选 择性反馈。
通过设置反馈类型字段中的预留值，以使得AP和STA确定信道状态信息的反馈方式是选择性反馈，以区别于其它非选择性反馈。
在一种可能的实现方式中，m个目标AP的信道状态信息满足预设条件，其中，若协作传输为联合传输，则n个AP中信道状态信息最好的m个AP满足预设条件；若协作传输为协作波束成形传输，则n个AP中信道状态信息最好的p个AP以及信道状态信息最差的q个AP满足预设条件，其中，p与q之和等于m。
通过上述方式，实现了STA可根据不同的协作传输方式，确定符合预设条件的信道状态所对应的AP。
在一种可能的实现方式中，方法还包括：STA接收主AP发送的第一数据，其中，第一数据为m个目标AP之间共享的数据，且主AP包含于m个目标AP中；若STA接收第一数据失败，则STA向m个目标AP中的p个重传AP发送重传请求帧，重传请求帧用于指示p个重传AP重新发送第一数据，p为大于或等于1且小于或等于m的整数。
通过上述方式，实现了一种在协作传输中的数据重传方式，STA在第一数据接收失败的情况下，可选择p个重传AP，并请求重传AP重新发送第一数据。
在一种可能的实现方式中，其中，重传请求帧中包括目的地址字段、重传AP信息字段、重传模式字段、以及发送地址指示字段；其中，目的地址字段为广播地址或重传AP的地址信息；重传AP信息字段包括重传AP的标识信息；重传模式字段用于指示是否采用联合传输重传第一数据；发送地址指示字段用于指示第一数据携带主AP的地址信息。
通过上述方式，STA可通过重传请求帧指示重传AP进行第一数据的发送。可选的，重新发送的第一数据可包括发送地址指示字段中携带的地址信息。
在一种可能的实现方式中，若p个重传AP不为主AP，则方法还包括：接收重传AP重传的第一数据，其中，第一数据包括主AP的地址信息；基于重传AP重传的第一数据以及主AP发送的第一数据，执行联合软解码，获取联合软解码后的第一数据。
通过上述方式，实现了STA可选择主AP之外的AP作为重传AP，并且，重传AP发送第一数据时，第一数据可携带主AP，或者说，前一次发送第一数据的AP的地址信息，使STA可对两次或两次以上接收到的同一数据(第一数据)执行联合软解码，以提升解码成功率。
第二方面，本申请实施例提供了一种信道探测方法，方法可包括：AP发送信道探测帧，信道探测帧用于站点STA基于信道探测帧进行信道探测，并获取信道状态信息；所述接入点接收STA发送的反馈信息；
基于反馈信息，AP确定是否被STA选中参与协作传输。
在一种可能的实现方式中，基于反馈信息，确定AP是否被STA选中参与协作传输的步骤，可以包括：接收STA反馈的信道测量报告帧，识别信道测量报告帧中是否包括AP的标识信息与信道状态信息；若识别到标识信息与信道状态信息，则确定AP被选中参与协作传输。
在一种可能的实现方式中，基于反馈信息，确定AP是否被STA选中参与协作传输 的步骤，还可以包括：AP接收STA发送的指示信息，指示信息用于指示AP未被选中参与协作传输；AP基于指示信息，确定AP未被选中参与协作传输。
在一种可能的实现方式中，指示信息包括AP的信道质量信息，和，AP的标识；或，指示信息包括未选中指示信息，和，AP的标识，未选中指示信息用于指示AP未被选中。
在一种可能的实现方式中，在STA反馈信道测量报告帧之前，还包括：AP发送或接收反馈类型指示，反馈类型指示用于指示STA反馈信道状态信息的类型，STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈。
在一种可能的实现方式中，方法还包括：AP接收主AP发送给AP和STA的第一数据；AP接收STA发送的重传请求帧，其中，重传请求帧为STA接收第一数据失败后向AP发送的，重传请求帧用于指示所述AP重新发送所述第一数据；向STA发送第一数据。
在一种可能的实现方式中，其中，重传请求帧中包含发送地址指示字段，用于指示发送第一数据的主AP的地址信息，方法还包括：AP向STA发送包括主AP的地址信息的第一数据。
第三方面，本申请实施例提供了一种应用于STA的通信装置，装置可包括：收发模块和获取模块。其中，收发模块可用于接收n个AP发送的信道探测帧，n为大于1的整数；获取模块可用于基于信道探测帧进行信道探测，获取每个AP的信道状态信息；收发模块还可用于发送信道测量报告帧，信道测量报告帧包括n个AP中的m个目标AP的信道状态信息和m个目标AP的标识，信道测量报告帧还用于指示m个目标AP被选中参与协作传输，m为大于1且小于或等于n的整数。
在一种可能的实现方式中，收发模块还可用于发送指示信息，指示信息用于指示(n-m)个非目标AP未被选中参与协作传输。
在一种可能的实现方式中，指示信息包括(n-m)个非目标AP的信道质量信息，和，(n-m)个非目标AP的标识；或，指示信息包括未选中指示信息，和，(n-m)个非目标AP的标识，未选中指示信息用于指示(n-m)个非目标AP未被选中，所述信道质量信息用于指示非目标AP与STA之间信道的信道质量。
在一种可能的实现方式中，收模块还用于：发送或接收反馈类型指示，反馈类型指示用于指示STA反馈信道状态信息的类型，STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈。
在一种可能的实现方式中，选择性反馈表示STA反馈n个AP中的部分AP的信道状态信息，非选择性反馈表示STA反馈n个AP中的每一个AP的信道状态信息。
在一种可能的实现方式中，信道测量报告帧包括：多输入多输出控制字段，多输入多输出控制字段的反馈类型字段为预留值，用于指示STA反馈信道状态信息的类型为选择性反馈。
在一种可能的实现方式中，m个目标AP的信道状态信息满足预设条件，其中，若协作传输为联合传输，则n个AP中信道状态信息最好的m个AP满足预设条件；若协作传输为协作波束成形传输，则n个AP中信道状态信息最好的p个AP以及信道状态信息最差的q个AP满足预设条件，其中，p与q之和等于m。
在一种可能的实现方式中，收发模块还用于：接收主AP发送的第一数据，其中，第一数据为m个目标AP之间共享的数据，且主AP包含于m个目标AP中；若STA接收第一数据失败，则向m个目标AP中的p个重传AP发送重传请求帧，重传请求帧用于指示p个重传AP重新发送第一数据，p为大于或等于1且小于或等于m的整数。
在一种可能的实现方式中，其中，重传请求帧中包括目的地址字段、重传AP信息字段、重传模式字段、以及发送地址指示字段；其中，目的地址字段为广播地址或重传AP的地址信息；重传AP信息字段包括重传AP的标识信息；重传模式字段用于指示是否采用联合传输重传第一数据；发送地址指示字段用于指示第一数据携带主AP的地址信息。
在一种可能的实现方式中，若p个重传AP不为主AP，则收发模块还用于：接收重传AP重传的第一数据，其中，第一数据包括主AP的地址信息；相应的，STA还包括解码模块，用于基于重传AP重传的第一数据以及主AP发送的第一数据，执行联合软解码，获取联合软解码后的第一数据。
第四方面，本申请实施例提供了一种应用于AP的通信装置，包括：收发模块以及处理模块，其中，收发模块可用于发送信道探测帧，信道探测帧用于STA基于信道探测帧进行信道探测，并获取信道状态信息，收发模块还用于接收STA发送的反馈信息；处理模块可用于基于的反馈信息，AP确定是否被STA选中参与协作传输。
在一种可能的实现方式中，收发模块还用于接收STA反馈的信道测量报告帧，处理模块进一步用于识别信道测量报告帧中是否包括AP的标识信息与信道状态信息；若识别到标识信息与信道状态信息，则处理模块确定AP被选中参与协作传输。
在一种可能的实现方式中，收发模块还用于接收STA发送的指示信息，指示信息用于指示AP未被选中参与协作传输；处理模块进一步用于基于指示信息，确定AP未被选中参与协作传输。
在一种可能的实现方式中，指示信息包括AP的信道质量信息，和，AP的标识；或，指示信息包括未选中指示信息，和，AP的标识，未选中指示信息用于指示AP未被选中。
在一种可能的实现方式中，收发模块还用于：发送或接收反馈类型指示，反馈类型指示用于指示STA反馈信道状态信息的类型，STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈。
在一种可能的实现方式中，收发模块还用于：接收主AP发送给AP和STA的第一数据；接收STA发送的重传请求帧，其中，重传请求帧为STA接收第一数据失败后向AP发送的，重传请求帧用于指示所述AP重新发送所述第一数据；向STA发送第一数据。
在一种可能的实现方式中，其中，重传请求帧中包含发送地址指示字段，用于指示发送第一数据的主AP的地址信息，收发模块还用于：AP向STA发送包括主AP的地址信息的第一数据。
第五方面，本申请实施例提供一种装置，该装置可以是STA设备，也可以是STA内的芯片。该装置具有实现上述第一方面涉及STA的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。
在一种可能的实现方式中，当该装置为STA时，STA包括：处理器和收发器，所述处理器被配置为支持STA执行上述各方面中相应的功能。收发器用于支持STA和AP之间的通信，向AP发送上述方法中所涉及的信息或指令。可选的，STA还可以包括存储器，所述存储器用于与处理器耦合，其保存STA必要的程序指令和数据。
在一种可能的实现方式中，该装置包括：处理器，基带电路，射频电路和天线。其中处理器用于实现对各个电路部分功能的控制，基带电路用于生成各类信令和消息，例如缓存指示消息，经由射频电路进行模拟转换、滤波、放大和上变频等处理后，经由天线发送给AP。可选的，该装置还可包括存储器，其保存STA必要的程序指令和数据。
在一种可能的实现方式中，该装置可以包括处理器和调制解调器，处理器可以用于运行指令或操作系统，以实现对STA功能的控制，调制解调器可以按协议对数据进行封装、编解码、调制解调、均衡等以生成信令信息，例如，信道探测报告帧等，以支持STA执行上述第一方面中相应的功能。
在一个可能的实现方式中，当该装置为STA内的芯片时，该芯片包括：处理模块和收发模块，所述处理模块例如可以是处理器，例如，此处理器用于生成各类消息和信令，并对各类消息按照协议封装后，进行编码，调制，放大等处理，所述处理器还可以用于解调，解码，解封装后获得信令和消息，所述收发模块例如可以是该芯片上的输入/输出接口、管脚或电路等。该处理模块可执行存储单元存储的计算机执行指令，以支持STA执行上述各方面中相应的功能。可选的，所述存储单元可以为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述STA内的位于所述芯片外部的存储单元，如只读存储器(read-only memory，简称ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，简称RAM)等。
在一种可能的实现方式中，该装置包括处理器，该处理器用于与存储器耦合，并读取存储器中的指令并根据所述指令执行上述第一方面中涉及STA的方法。该存储器可以位于该处理器内部，还可以位于该处理器外部。
其中，上述任一处提到的处理器，可以是一个通用中央处理器(Central Processing Unit，简称CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，简称ASIC)，或一个或多个用于控制上述各方面信道探测方法的程序执行的集成电路。
第六方面，本申请提供一种装置，该装置可以是AP，也可以是AP内的芯片。该装置具有实现上述第二方面中涉及AP的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。
在一种可能的实现方式中，当该装置为AP时，AP包括：处理器和收发器，所述处理器被配置为支持AP执行上述方法中相应的功能。收发器用于支持AP与AP或AP与站点之间的通信，接收STA发送上述方法中所涉及的信息或指令，例如，信道测量报告帧等。可选的，AP还可以包括存储器，所述存储器用于与处理器耦合，其保存AP必要的程序指令和数据。
在一种可能的实现方式中，该装置包括：处理器，基带电路，射频电路和天线。其中处理器用于实现对各个电路部分功能的控制，射频电路可以对经由天线接收到的STA发送的信令，进行数字转换、滤波、放大和下变频等处理后，经由基带电路进行解码按 协议解封装以获取信令信息。可选的，该装置还包括存储器，其保存AP必要的程序指令和数据。
在一种可能的实现方式中，该装置包括处理器和调制解调器，处理器可以用于指令或操作系统，以实现对AP功能的控制，调制解调器可以按协议对数据进行封装、编解码、调制解调、均衡等以生成信道探测帧，或，解析信道测量报告帧等，以支持AP执行上述第二方面中相应的功能。
在一个可能的实现方式中，当该装置为AP内的芯片时，该芯片包括：处理模块和收发模块，所述处理模块例如可以是处理器，此处理器可以用于对经由收发模块接收到的信令，进行滤波、解调、功率放大、解码等处理，所述收发模块例如可以是该芯片上的输入/输出接口、管脚或电路等。该处理模块可执行存储单元存储的计算机执行指令，以支持AP执行上述第二方面相应的功能。可选的，所述存储单元可以为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述AP内的位于所述芯片外部的存储单元，如只读存储器(read-only memory，简称ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，简称RAM)等。
在一种可能的实现方式中，该装置包括处理器，该处理器用于与存储器耦合，并读取存储器中的指令并根据所述指令执行上述第二方面中所述的方法。该存储器可以位于该处理器内部，还可以位于该处理器外部。
其中，上述任一处提到的处理器，可以是一个通用中央处理器，微处理器，特定应用集成电路，或一个或多个用于控制上述各方面信道探测方法的程序执行的集成电路。
第七方面，本申请提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，所述指令可以由处理电路上的一个或多个处理器执行。当其在计算机上运行时，使得计算机执行上述第一方面或第二方面中任一方面或其任意可能的实现方式中的方法。
第八方面，提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行上述第一方面或第二方面中的任一方面或其任意可能的实现方式中的方法。
第九方面，本申请提供了一种芯片系统，该芯片系统包括处理器，用于支持数据发送设备实现上述方面中所涉及的功能，例如生成或处理上述各方面中所涉及的数据和/或信息。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存数据发送设备必要的程序指令和数据。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第十方面，本申请实施例提供一种无线通信系统，该系统包括上述方面涉及的至少一个STA和，至少一个AP。
附图说明
图1是示例性示出的一种信道探测流程示意图；
图2是示例性示出的一种MIMO控制字段的帧结构示意图；
图3是本申请实施例提供的一种应用场景示意图之一；
图4是申请实施例提供的一种信道探测方法的流程示意图之一；
图5是申请实施例提供的一种声明帧的帧结构示意图；
图6是申请实施例提供的一种信道测量报告帧的帧结构示意图；
图7是申请实施例提供的一种NDPA帧的帧结构示意图之一；
图8是申请实施例提供的一种信道探测方法的流程示意图之一；
图9是申请实施例提供的一种指示帧的帧结构示意图；
图10是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图11是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图12是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图13是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图14是申请实施例提供的一种NDPA帧的帧结构示意图之一；
图15是申请实施例提供的一种信道探测方法的流程示意图之一；
图16是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图17是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图18是申请实施例提供的一种波束成形报告帧的帧结构示意图之一；
图19是申请实施例提供的一种信道探测方法的流程示意图之一；
图20是申请实施例提供的一种重传帧的帧结构示意图；
图21是申请实施例提供的一种物理前导码的帧结构示意图；
图22是本申请实施例提供的一种应用场景示意图之一；
图23本申请实施例提供的一种STA侧的装置的示意性框图之一；
图24本申请实施例提供的一种STA侧的装置的示意性框图之二；
图25本申请实施例提供的一种AP侧的装置的示意性框图之一；
图26本申请实施例提供的一种AP侧的装置的示意性框图之二。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本申请实施例的说明书和权利要求书中的术语“第一”和“第二”等是用于区别不同的对象，而不是用于描述对象的特定顺序。例如，第一目标对象和第二目标对象等是用于区别不同的目标对象，而不是用于描述目标对象的特定顺序。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
在本申请实施例的描述中，除非另有说明，“多个”的含义是指两个或两个以上。例 如，多个处理单元是指两个或两个以上的处理单元；多个系统是指两个或两个以上的系统。
在对本申请实施例的技术方案说明之前，首先结合附图对本申请实施例的通信系统进行说明。参见图3，为本申请实施例提供的一种应用场景示意图。该应用场景中包括AP1、AP2、AP3、以及STA。本申请实施例具体实施的过程中，STA为具有无线收发功能的通信装置，例如，可以基于802.11协议与其他网元进行通信，STA也可以称作用户终端、用户装置，接入装置，订户站，订户单元，移动站，用户代理，用户装备或其他名称，例如可以为电脑、智能手机，平板电脑等设备；AP为可以为STA提供服务的，具有无线收发功能的通信装置，例如，可以基于802.11协议与其他网元进行通信，例如，WLAN通信系统中的接入点，路由器，交换机，微基站或小基站等。需要说明的是，在实际应用中，AP的数量为一个或一个以上，STA的数量可以为一个或一个以上，图3所示应用场景的STA和AP的数量仅为示意性举例。本申请对此不做限定。
结合上述如图3所示的应用场景示意图，下面介绍本申请的具体实施方案：
具体的，在本申请中，STA可基于对AP的信道进行信道测量后的信道状态信息，进行协作AP的选定，并以是否发送信道状态信息通知各AP是否选中，也就是说，各AP可是否接收到信道状态信息而确定是否被选中参与协作传输。
在本申请实施例中，将STA通过向已选定的AP发送其所需的信道状态信息，而不向未选定的AP反馈任何结果的场景记为场景一。将STA通过向已选定的发送其所需要的信道状态信息，而向未选定的AP发送可以指示部分信道状态信息但非其所需的全部信道状态信息的场景记为场景二。本申请实施例中，基于STA的信道状态信息及反馈结果的协作传输流程，该场景记为场景三。下面结合附图3对各个场景进行详细说明。
场景一
结合图3，如图4所示为本申请实施例中的信道探测方法的流程示意图，在图4中：
步骤101，n个AP向STA发送信道探测帧。n为大于1的整数。
可选的，在本申请的实施例中，在发送信道探测帧之前，AP发送NDPA帧，用于通知STA对AP的信道进行信道探测。可选的，主AP和从AP可以都发送NDPA帧，也就是说，AP可各自发NDPA帧与NDP帧，可选的，也可以仅有其中的一个AP发送NDPA帧，本申请不作限定。
例如，AP1可发送NDPA帧以告知参与信道探测的STA与AP。例如，若参与信道探测的AP包括AP1，AP2，AP3，AP1广播NDPA帧，用于通知图3中的STA对AP1、AP2和AP3的信道进行信道探测。
又例如，AP1可广播NDPA帧，通知STA基于AP1发送的NDP帧进行信道探测，随后，AP1发送NDP帧；接着，AP2也广播NDPA帧，通知STA基于AP2发送的NDP帧进行信道探测；AP3类似。
步骤102，STA对n个AP的信道进行信道探测，获取信道状态信息。
具体的，在本申请中，例如：STA可在接收到AP1、AP2、和/或AP3发送的NDP帧后，基于NDP帧对AP1、AP2和/或AP3的信道进行信道探测，以获取信道状态信息。
可选的，信道状态信息是反映AP和STA之间的信道情况的信息，可以表征AP和 STA之间信道的特征，AP可根据STA反馈的信道状态信息，获取AP与STA之间的下行信道的状态，并可根据信道的状态，在该信道上与STA进行通信(收发信令或数据)。
步骤103，STA根据信道状态信息，从n个AP中选择m个目标AP。
具体的，在本申请的实施例中，STA可将各AP的信道状态信息与预设条件相匹配，其中，信道状态信息满足预设条件的AP即为目标AP，而信道状态信息未满足预设条件的AP即为非目标AP。
可选的，若协作传输为联合传输，则预设条件可以为：选择信道状态信息最好的AP。若协作传输为协作波束成形传输，则预设条件可以为：选择信道状态信息最好的AP以及信道状态信息最差的AP为目标AP。可选的，在协作传输为协作波束成形传输，并且与STA关联的AP已选定的情况下，m个目标AP还可以为信道状态信息最差的AP。一种实现方式中，信道状态信息最好可以指的是信道状态信息大于或等于上限阈值，信道状态信息最差可以指的是信道状态信息小于或等于下限阈值；另一种实现方式中，信道状态信息最好可以指的是信道状态信息最大，信道状态信息最差可以指的是信道状态信息最小。
举例说明：若协作传输为联合传输，则，STA可选择n个AP中的m个信道状态较好的AP作为目标AP。
可选的，若协作传输为协作波束成形传输，则，STA可选择n个AP中的m个信道状态较差的AP作为目标AP，所述选中的m个目标AP将在协作波束成形传输中，与其它STA关联。可选的，若已选定与STA进行协作传输的k个AP(k为大于或等于1的整数)，则，STA从n个AP中除所述k个AP以外的(n-k)个AP中选择m个目标AP。从而降低m个目标AP与其它STA之间的信道对所述k个AP与图1中的STA之间的信道造成干扰。例如：在主AP已选定的情况下(以AP1为主AP为例)，则，STA可选择AP2和AP3中信道状态信息较差的AP(例如AP3)作为目标AP，该目标AP将与另一个STA(图中未示出)关联，在后续的协作波束成形传输中，AP1向STA发送数据1，同时，AP3向另一个STA发送数据2。
可选的，若协作传输为协作波束成形传输，则，STA还可以选择信道状态信息最好与信道状态信息最差的m个AP作为目标AP，其中，最好的探测结果对应的AP数量与最差的信道状态信息对应的AP数量之间的比例可根据实际需求进行设置，例如：当n＝4时，可设置选取2个目标AP，其中，可选取信道状态信息最好的1个AP与信道状态信息最差的1个AP可以进行协作波束成形传输为STA提供服务。
在本申请中，STA根据上述预设条件选取目标AP时，STA在获取到n个AP的信道状态信息后，选择出目标AP，并进行后续的反馈流程。可选的，STA还可以采用瞬时判断与反馈的方式，具体的，STA可对AP的信道进行信道探测，并获取信道质量信息，AP可基于信道质量信息，判定下行信道的状态是好或者坏。其中，若确定下行信道的状态为良好(具体判定方式将在下面的实施例中说明)，则AP选择对应的AP为目标AP，并向目标AP反馈信道状态信息。
需要说明的是，信道质量信息可为任一能够反映STA与AP之间的信道质量的指标，但是，信道质量信息无法使AP基于该指标获取到通过下行信道进行数据传输所需的信 道特征，也就是说，AP可基于信道质量信息，确定下行信道的状态是好或者坏，但是AP无法根据信道质量信息获取到通过下行信道进行数据传输所需的全部信道特征，从而无法进行后续的数据传输过程。相比于信道状态信息，信道质量信息的获取方式更加简单、快捷，从而使STA能够在获取到信道质量信息后，即可判定AP的信道状态是否满足预设条件，或者说，是否可以作为目标AP参与协作传输。信道质量信息表征的信道特征的信息量少于信道状态信息表征的信道特征的信息量中。可选的，信道质量信息包括但不限于：信号强度指示(Received Signal Strength Indication，RSSI)，信噪比(Signal-to-Noise Ratio，SNR)，信号与干扰加噪声比(Signal to Interference plus Noise Ratio，SINR)或信道相关性等。
可选的，若协作传输为联合传输，则预设条件可以为：若AP的信道质量信息大于或等于第一阈值，则确定满足预设条件。可选的，若协作传输为协作波束成形传输，则预设条件可以为：若AP的信道质量信息小于或等于第二阈值，则确定满足预设条件。需要说明的是，第一阈值和第二阈值可以采用协议约定的方式，还可以是由AP确定后指定给STA，还可以由STA自行确定，本申请实施例不限定。
可选的，若协作传输为联合传输，STA可设置第一阈值，将信道质量信息大于或等于第一阈值的AP选择为目标AP。其中，信道质量信息和第一阈值均可以为RSSI、SNR、SINR或信道相关性等指标。举例说明：当STA对AP2的信道进行测量后，获取到的指标为RSSI，若协作传输为联合传输，则，STA将RSSI与预设的RSSI(可根据实际需求进行设置)进行比较，若大于或等于预设的RSSI，则确定AP2为目标AP。对于其它可选的阈值的设定，均可根据实际需求进行设置，本申请不做限定。
可选的，若协作传输为协作波束成形传输，STA可设置第二阈值，将信道质量信息小于或等于第二阈值的AP选择为目标AP。其中，信道质量信息和第二阈值均可以为RSSI、SNR、SINR或信道相关性等指标，并且，第二阈值可以与第一阈值相同也可以不同，本申请不做限定。
参照图3，在步骤103中，例如，STA从AP1、AP2、和AP3中选择AP1和AP2为参与协作传输的目标AP，AP3为未被选中协作传输的非目标AP。
步骤104，STA发送信道测量报告帧，信道测量报告帧中包括n个AP中的m个目标AP的信道状态信息和m个目标AP的标识，信道测量报告帧还用于指示m个目标AP被选中参与协作传输。
可选的，信道测量报告帧可以为波束成形报告帧，则信道状态信息可以承载于波束成形报告帧中包括的波束成形报告字段中。信道状态信息可以为被压缩的信道特征，还可以是非压缩的信道特征。例如，信道状态信息可以是：压缩的波束成形报告，或，非压缩的波束成形报告。采用压缩的形式反馈可进一步减少信道状态信息反馈的开销。
具体的，在本申请中，基于步骤103，STA可选择出参与协作传输的m个目标AP。随后，STA可向选中的m个目标AP发送包括目标AP的标识信息以及信道状态信息的信道测量报告帧，以通知m个AP被选中参与协作传输。举例说明：仍以图4为例，STA发送信道测量报告帧，其中，信道测量报告帧包括m目标AP(包括AP1和AP2)的标识信息，以及AP1和AP2的信道状态信息，信道测量报告帧除可用于反馈AP1与 AP2的信道状态信息外，还可用于指示AP1和AP2被选中为参与协作传输的目标AP。可选的，STA可通过单播的方式依次顺序的发送m个信道测量报告帧，一个信道测量报告帧携带一个目标AP的信道测量结果和标识。相应的，接收到信道测量报告帧的AP即可确定被选中参与协作传输，并可从信道测量报告帧中获取对应的信道状态信息。
可选的，STA可通过广播的方式发送信道测量报告帧，其中，信道测量报告帧包括m个目标AP的信道测量结果和m个目标AP的标识信息，相应的，接收到广播的信道测量报告帧的AP可基于信道测量报告帧中的标识信息，确定是否被选中。具体的，若AP将自身的标识信息与信道测量报告帧中的标识信息匹配成功，则可确定被选中，该AP可从报告帧中获取对应的信道状态信息；相应的，如果自身的标识信息与信道测量报告帧中的标识信息匹配失败，则该AP即为未被选中参与协作传输的AP，可称为非目标AP。下面分别对信道测量报告帧在单播与广播的方式下，通知AP是否被选中的方式进行详细说明：
1)信道测量报告帧的发送方式为单播。
具体的，STA可分别向m个目标AP反馈它们的信道测量报告帧，并且信道测量报告帧中包括目标AP的标识信息以及信道状态信息。
举例说明：参照图3，STA可向AP1发送信道测量报告帧，该帧的目的地址即为AP1的地址信息。可选的，地址信息可以为MAC地址信息。AP1在监听到该信道测量报告帧后，识别到信道测量报告帧的地址信息(即为本申请实施例中所述的目标AP的标识信息)与AP1本地地址信息相匹配，则，AP1接收该信道测量报告帧，并识别到信道测量报告帧中包括AP1的信道状态信息，则，AP1可在获得信道状态信息的同时，确定其为被选中参与协作传输的目标AP。需要说明的是，信道测量报告帧中的地址信息可以为本申请所述的AP的标识信息，也就是说，当AP识别到该标识信息与本地标识信息(也就是本地地址信息)相匹配，并且帧中包括信道状态信息时，可确定自身为被选中的目标AP。可选的，信道测量报告帧中还可以携带除地址信息以外，其它可标识AP1的标识信息，例如：关联标识(Association Identifier,AID)。相应的，AP1在接收到信道测量报告帧后，可通过识别信道测量报告帧中是否包括AP1的AID以及对应的信道状态信息，以确定自身是否被选中为目标AP。以及，STA可向AP2发送信道测量报告帧，该帧的目的地址为AP2的地址信息，并且，信道测量报告帧中包括AP2的信道状态信息，以通知AP2被选中参与协作传输。
可选的，如上所述，若信道测量报告帧的发送方式为单播，则，对于未选中的(n-m)个非目标AP，STA可通过不向非目标AP反馈信道测量报告帧的方式，告知非目标AP未被选中参与协作传输。也就是说，在该实施例中，AP在指定时刻未收到信道测量报告帧，则可确定自身未被选中参数协作传输。可选的，指定时刻可以为AP发送NDP帧的预定时长后，预定时长可根据实际需求进行设置，例如：可以为SIFS，本申请不做限定，或者，指定时刻还可以为全部AP的NDP帧发送完成的预定时长后，指定时刻可根据实际需求进行设置，本申请不做限定。
可选的，在本申请中，信道测量报告帧可以为波束成形报告帧，波束成形报告帧包括但不限于：MIMO控制字段以及波束成形报告字段。可选的，信道状态信息可承载于 波束成形报告字段。
可选的，在本申请中，MIMO控制字段可包含用于指示STA反馈信道状态信息的类型为选择性反馈的信息。可选的，该信息可承载于MIMO控制字段中的反馈类型字段中。可选的，反馈类型字段中可采用设置预设值的方式表示该信息。例如：反馈类型字段中的参数值可设置为3，以指示当前反馈类型为选择性反馈。
需要说明的是，本申请所述的选择性反馈是指，由STA进行目标AP的选择，并且，STA仅向部分AP，例如：目标AP(被选中的AP)，反馈信道状态信息。反之，非选择性反馈即为其它可行的反馈方式，例如：STA向参与信道探测的n个AP中的每一个AP反馈信道状态信息的反馈方式。例如：如图1所示，AP1、AP2、AP3参与信道探测，非选择性反馈则为：STA需要向AP1、AP2和AP3反馈信道状态信息。本申请中的选择性反馈为：STA可以向AP1和AP2反馈信道状态信息，而不向AP3反馈信道状态信息。
需要说明的是，在非选择性反馈方式中，MIMO控制字段中的反馈类型字段的值可以为0、1、2或3。其中，0、1、2已被占用，本申请可使用取值3指示反馈类型为选择性反馈，也可以用MIMO控制字段中的其他字段或预留比特位指示反馈类型为选择性反馈，本申请不做限定。
2)信道测量报告帧的发送方式为广播。
可选的，STA获取AP的信道状态信息后，生成信道测量报告帧，信道测量报告帧中的目的地址为广播地址，可通过广播的方式以进一步降低信道占用，节省信道开销。
具体的，信道测量报告帧中可包括目标AP的标识信息以及信道状态信息。可选的，接收到所述信道测量报告帧的AP，可将本地标识信息与帧中携带的标识信息匹配来确定是否为目标AP。例如若匹配成功，则可确定自身为目标AP，并提取对应的信道状态信息。反之，若匹配失败，则可确定自身为非目标AP，未被选中参与协作传输。可选地，例如：若信道测量报告帧为波束成形报告，则AP的标识信息可承载于MIMO控制字段，或者，MIMO控制字段和波束成形报告字段，或者波束成形报告字段中。可选地，AP的标识信息还可以承载于在信道测量报告帧之前发送的其它帧中，AP标识信息可以为AP的顺序指示，用于指示属于各AP的字段在波束成形报告帧中的位置，则AP可根据AP的顺序指示，确定信道测量报告帧中的自己的波束成形报告字段的位置，从而获取到自身的信道状态信息。可选地，AP标识信息或AP的顺序指示可以承载于NDPA帧或信道测量报告触发帧中。
可选的，信道测量报告帧可包含多个STA信息字段(或可称为AP信息字段)，每个STA信息字段与目标AP一一对应。可选的，AP的标识信息与信道状态信息可对应承载于STA信息字段中，例如：AP1的标识信息与信道状态信息可承载于STA信息字段1中，AP2的标识信息与信道状态信息可承载于STA信息字段2中。AP可通过读取STA字段中的标识信息，确定该字段中所携带的信道状态信息为其所需的信道状态信息，并获取到本地。可选的，信道测量报告帧中的每个AP的标识信息与信道状态信息还可以用分隔符进行区分。对于广播的信道测量报告帧中用于隔离不同的AP的标识信息与信道状态信息的方式，不限定于上述隔离方式，本申请不做限定。
可选的，在本申请中，为实现本申请实施例中所述的选择性反馈的方式，AP和 STA也可以交互反馈类型指示，以使得AP和STA都确知反馈的类型。例如，AP(指主AP，例如AP1，或任一AP，本申请不做限定)可发送反馈类型指示，用于通知其它AP和/或STA反馈流程中采用选择性反馈方式或非选择性反馈方式(选择性反馈与非选择性反馈的具体实现方式见上文)。可选的，在本申请中，该反馈类型指示也可以由STA发送，本申请不做限定。
可选的，在本申请中，反馈类型指示可携带于声明帧中。该声明帧可在STA反馈信道测量报告帧之前的任意时刻发送。可选的，在本申请中，声明帧中可包含反馈类型指示字段，用于承载所述反馈类型指示。其中，反馈类型指示字段的长度可以为2bits，一个示例中，反馈类型指示对应的值及其指示作用如表1所示。当然，反馈类型的不同取值所对应的不同指示作用是可以变换的。
表1
Figure PCTCN2020102333-appb-000001
可选的，在本申请中，声明帧的帧结构如图5所示，参照图5，声明帧中还包括但不限于：帧控制字段、接收地址字段(或可称为目的地址字段)、发送地址字段以及其它字段。
可选的，在本申请中，反馈类型指示还可以携带于AP(或可指主AP，例如AP1)发送的信道测量报告触发帧中。可选的，信道测量报告触发帧可包含反馈类型字段，反馈类型指示可承载于反馈类型字段中。如图6所示为触发帧的帧结构示意图，其中，反馈类型字段的长度及参数设置可参照声明帧中的反馈类型字段，此处不赘述。以及，触发帧还包括其它字段(例如：帧控制字段、接收地址字段以及发送地址指示字段等，本申请不再赘述。)。
可选的，在本申请中，反馈类型指示还可以携带于NDPA帧中。可选的，反馈类型指示可承载于NDPA帧中的STA信息字段中，以指示该STA信息字段对应的STA所采用的反馈方式为选择性反馈。如图7所示为本申请中的NDPA帧的帧结构示意图，其中，NDPA中包含多个STA信息字段，分别对应STA1、STA2与STA3(本申请的图中未示出)，STA1对应的STA信息字段中包含反馈类型指示字段，该字段的长度可以为2bits， 并且参数值的设置可参照表2，此处不赘述。
结合图3，如图8所示为本申请实施例中的信道探测方法的流程示意图，在图8中
步骤201，n个AP向STA发送信道探测帧。
步骤202，STA对n个AP的信道进行信道探测，获取信道状态信息。
步骤203，STA根据信道状态信息，从n个AP中选择m个目标AP。
步骤204，STA发送信道测量报告帧，信道测量报告帧包括n个AP中的m个目标AP的信道状态信息和m个目标AP的标识，信道测量报告帧还用于指示m个目标AP被选中参与协作传输。
步骤205，STA发送指示帧，指示帧中不包括(n-m)个非目标AP的信道状态信息。
具体的，STA可通过信道测量报告帧指示m个目标AP被选中参与协作传输，其中，STA发送信道测量报告帧的方式可参照步骤104，此处不赘述。进一步的，STA还可以发送指示帧，该指示帧用于指示(n-m)个非目标AP未被选中参与协作传输。举例说明：参照图3，可选的，STA发送包括AP1和AP2的标识信息以及信道状态信息的信道测量报告帧，以及，STA发送指示帧，指示帧中不包括非目标AP(AP3)的信道状态信息。
可选的，指示帧可以仅包括目的地址、发送地址与反馈类型字段的具有简单帧结构的帧，例如，该指示帧的结构可如图9所示，从而进一步节省信道开销。举例说明：STA向AP3发送所述指示帧，AP3接收指示帧，并识别指示帧中未包含信道状态信息，则确定AP3未被选中参与协作传输。
可选的，指示帧还可以与信道测量报告帧具有相同的帧结构，例如都为波束成形报告帧。区别于目标AP的信道测量报告帧，非目标AP的信道测量报告帧的信道测量报告字段不包括信道状态信息。举例说明：STA发送信道测量报告帧，其中，发送给AP1与AP2的信道测量报告帧包括信道状态信息，发送给AP3的信道测量报告帧未携带信道状态信息。则，AP3在识别到信道测量报告帧中未携带AP3的信道状态信息后，确定未被选定参与协作传输。
可选的，指示帧中承载的信息和信道测量报告帧中承载的信息可以合并到一个波束成形报告帧中发送出去。
一个示例：以指示帧为一个单独的波束成形报告帧为例进行详细阐述。
可选的，STA向非目标AP发送的波束成形报告帧中包括MIMO控制字段，而不包括用于承载信道状态信息的波束成形报告字段。可选地，STA向非目标AP发送的波束成形报告帧中可包括MIMO控制字段与波束成形报告字段，其中，波束成形报告字段为空，从而使接收到该类不包括信道状态信息的波束成形报告帧的AP，确定未被选定参与协作传输。
为实现上述反馈方式，本申请所采用的波束成形报告帧可包括：MIMO控制字段、波束成形报告字段、以及选择信息字段。其中，MIMO控制字段可用于携带AP的控制信息。控制信息包括但不限于：带宽、发送天线数量、接收天线数量等。可选的，MIMO控制字段可例如图2所示。波束成形报告字段中包括但不限于：信道状态信息等。选择信息字段包括但不限于：未选中指示信息和/或信道质量信息(SNR、RSSI、和/或信道相 关性等)等。波束成形报告帧还可包括但不限于：类别字段，用于标识波束成形报告帧的类型，和，动作指示字段，用于指示发送波束成形报告帧，并且AP不用回复响应帧。
另一个示例，指示帧中承载的信息和信道测量报告帧中承载的信息也可以合并到一个波束成形报告帧中发送出去。
一个示例中，波束成形报告帧中可能包括的字段及含义可如表2或表3所示。需要说明的是，对于不同的反馈形式，波束成形报告帧可不包括表2或表3中的全部字段，而是可适应性地包括其中的部分字段。
表2
Figure PCTCN2020102333-appb-000002
表3
Figure PCTCN2020102333-appb-000003
其中，表2与表3的区别在于，采用表2中的帧结构时，波束成形报告帧中包括一个或一个以上MIMO控制字段，并且每个MIMO控制字段与AP一一对应，即，一个MIMO控制字段包括对应的AP的控制信息。采用表3中的帧结构时，波束成形报告帧中包括一个MIMO控制字段，承载所有AP的控制信息。
下面首先结合表2中所示的帧结构进行详细说明，表3中的帧结构将在下面的实施例中进行详细说明。非目标AP(AP3)的波束成形报告帧的结构可如图10所示。其中，波束成形报告帧中包括表2中的AP3的MIMO控制字段，用于承载AP3的控制信息。AP3接收波束成形报告帧，识别到波束成形报告帧中未携带波束成形报告字段，即，未携带信道状态信息。则，AP3确定未被选定参与协作传输。
可选的，仍参照图10，非目标AP(AP3)的波束成形报告帧还可包括MIMO控制字段和波束成形报告字段，其中，波束成形报告字段为空，即，不包括信道状态信息。相应的，AP3接收包含波束成形报告帧，识别到波束成形报告帧中的波束成形报告字段不包括信道状态信息，则，AP3确定未被选定参与协作传输。可选的，波束成形报告帧中还包括表2中的类别字段、动作指示字段等。
可选的，结合表2，若波束成形报告帧的发送方式为广播，则STA发送的波束成形报告帧中可包括目标AP的MIMO控制字段和波束成形报告字段，以及非目标AP的MIMO控制字段。举例说明：波束成形报告帧的帧结构还可以如图11所示。其中，波束成形报告帧中包括AP1的MIMO控制字段(即图中MIMO控制字段1)和波束成形报告字段(即图中波束成形报告字段1)、AP2的MIMO控制字段(即图中MIMO控制字段2)和波束成形报告字段(即图中波束成形报告字段2)、以及AP3的MIMO控制字段(即图中MIMO控制字段3)。可选地，AP的标识信息可承载于MIMO控制字段和波 束成形报告字段中，例如：AP1、AP2、和AP3可通过匹配各自的标识信息，获取到各自对应的字段。其中，AP1和AP2可识别并获取MIMO控制字段与波束成形报告字段中的信息。AP3未识别到AP3的波束成形报告字段，即，未获取到信道状态信息，则AP3可确定未被选中，以及，AP3可获取MIMO控制字段中的控制信息。
可选的，AP的标识信息还可以承载于MIMO控制字段，而不承载于波束成形报告字段，AP可通过匹配MIMO控制字段中的标识信息，获取到对应的MIMO控制字段，并且，确定后面与MIMO控制字段相邻的字段为自己的波束成形报告字段，或者可以为，AP在读取到下一个包含有其它AP的标识信息的字段之前，均为该AP自己的字段，例如，如图12所示，MIMO控制字段1包括AP1的标识信息，AP1可基于该标识信息，确定MIMO控制字段1对应于AP1，获取其中的控制信息，并继续读取后面的波束成形报告字段。
可选的，AP的标识信息(包括目标AP和非目标AP)还可以承载于在信道测量报告帧之前发送的其它帧中，用于指示对应的AP根据AP的标识信息的顺序，获取信道测量报告帧中属于自己的字段。可选地，AP标识信息可承载于NDPA帧或信道测量报告触发帧中。
可选地，波束成形报告帧中还可以包括目标AP的MIMO控制字段和波束成形报告字段，以及非目标AP的MIMO控制字段和波束成形报告字段，其中，非目标AP的波束成形报告字段为空。
需要说明的是，本申请所述的帧结构中的各字段的位置仅为示意性举例，可根据实际需求进行设置，本申请不做限定。
可选的，结合表3，AP(AP1、AP2和AP3)还可以共用一个的MIMO控制字段，也就是说，AP1、AP2和AP3的控制信息可承载于MIMO控制字段。可选地，AP的标识信息可与控制信息对应承载于MIMO控制字段中，相应的，AP可通过识别标识信息，确定标识信息后面的字段(下一个标识信息之前的字段)为自己的控制信息。例如：波束成形报告帧的帧结构可参照图13，具体的，波束成形报告帧中包括AP的MIMO控制字段、AP1的波束成形报告字段(即图中波束成形报告字段1)、AP2的波束成形报告字段(即图中的波束成形报告字段2)。相应的，AP1、AP2和AP3可读取MIMO控制字段获取各自的控制信息，其中，AP3未识别到对应的波束成形报告字段，也就是说，AP3并没有获取到对应的信道状态信息，则AP3确定未被选中。可选地，AP的标识信息也可以承载于在信道测量报告帧之前发送的其它帧中，AP可根据AP的标识信息指示的顺序，获取信道测量报告帧中属于自己的字段。
可选的，在本申请中，STA还可对信道测量报告帧(例如波束成形报告帧)进行压缩，从而进一步减小信道开销。可选的，STA通过通用或私有的算法对波束成形报告进行压缩。通用算法包括但不限于：动态图像专家组(Moving Picture Experts Group，MPEG)-2、MPEG-4、H.264、请求评议(Request For Comments，RFC)1951、RFC 1952等算法。具体压缩方式可参照已有技术，本申请不做限定。相应的，在本申请中，STA可发送压缩指示字段，压缩指示字段用于指示波束成形报告字段被压缩。可选的，压缩指示字段可包含于波束成形报告帧中。AP可基于压缩指示字段的指示，对压缩的波束成形报 告字段进行解压缩，以得到波束成形报告帧。可选的，AP发送的NDPA帧中可包括压缩指示，用于通知其他AP，波束成形报告被压缩，并用于通知STA对波束成形报告进行压缩。可选的，压缩指示可承载于NDPA帧中的反馈类型字段，其帧结构可参照图14。可选的，上述对帧进行压缩的方式还可以应用于点对点传输，例如：STA与STA之间的信令交互过程。
需要说明的是，步骤204、步骤205可同时执行或顺序执行，并且执行顺序不做限定。可选的，STA可先执行步骤204，向目标AP发送信道测量报告帧，再执行步骤205，向非目标AP发送指示帧；或者，STA可先执行步骤205，再执行步骤204；或者，STA可同时执行步骤204和步骤205。
综上，本申请实施例中的技术方案，STA可通过发送信道测量报告帧，以通知目标AP被选中参与协作传输。STA不发送未选中的非目标AP的信道状态信息，用于通知非目标AP未被选中参与协作传输。STA还可以通过向非目标AP发送不携带信道状态信息的指示帧，用于通知非目标AP未被选中参与协作传输，从而提供一种由STA执行的协作AP选择的信道探测方式，并且，STA可选择性的反馈信道状态信息，以有效节省信道开销，提升资源利用率，实现协作AP的选择。
场景二
结合图3，如图15所示为本申请实施例中的信道探测方法的流程示意图，在图15中：
步骤301，n个AP向STA发送信道探测帧。
步骤302，STA对n个AP的信道进行信道探测，获取信道状态信息。
步骤303，STA根据信道状态信息，从n个AP中选择m个目标AP。
步骤304，STA发送信道测量报告帧，信道测量报告帧中包括n个AP中的m个目标AP的信道状态信息和m个目标AP的标识，信道测量报告帧还用于指示m个目标AP被选中参与协作传输。
步骤305，STA发送指示信息，指示信息包括信道质量信息或未选中指示信息。
具体的，在本申请中，STA可通过发送信道测量报告帧指示m个目标AP被选中参与协作传输，其中，STA发送信道测量报告帧的方式可参照步骤104，此处不赘述。
进一步的，STA还可以发送指示信息，该指示信息用于指示(n-m)个非目标AP未被选中参与协作传输。可选的，指示信息可以承载于波束成形报告帧中。或者，可选的，指示信息还可以承载于指示帧中，指示帧具有简单的帧结构，包括：发送地址、接收地址及指示字段(指示字段携带所述指示信息)。
举例说明：参照图15，可选的，STA发送包括AP1和AP2的标识信息以及信道状态信息的信道测量报告帧，用于指示AP1和AP2被选中为参与协作传输的目标AP，以及，STA发送指示信息，指示信息包括AP3的信道质量信息或未选中指示信息，用于指示AP3未被选中参与协作传输。
可选的，指示信息中可包括信道质量信息，用于非目标AP识别到指示信息中仅携带信道质量信息，而未携带AP所请求的信道状态信息时，可确定AP未被选中参与协作 传输。另外，信道质量信息还可以反映信道质量的好坏，相应的，AP可基于信道质量信息，确定其与STA之间的信道质量。可选的，信道质量信息可以为RSSI、SNR、信道相关性等指标。可选的，信道质量信息所占比特长度小于AP所需的全部信道状态信息所占比特长度，从而进一步节省信道开销。
可选的，指示信息中还可包括未选中指示信息，用于非目标AP识别到指示帧中包括该未选中指示信息时，可确定AP未被选中参与协作传输。可选的，指示信息的长度可为1bit，从而进一步节省信道开销。
下面结合图3，以指示信息承载于信道测量报告帧(或波束成形报告帧)中为例进行详细说明。
可选的，在本申请中，波束成形报告帧可包括两种形式：
1)一个波束成形报告帧可承载多个AP的信息。
2)一个波束成形报告帧仅承载一个AP的信息。
对于1)，可选的，波束成形报告帧中可包括AP1、AP2的信道状态信息，以及，AP3的指示信息，用于AP1和AP2识别到信道状态信息后，确定为被选中的目标AP，以及AP3识别到指示信息后，确定为未被选中的非目标AP。
例如：波束成形报告帧包括选择信息字段。可选的，所述指示信息可承载于该选择信息字段中，用于AP3在识别到该选择信息字段后，确定未被选中。例如：波束成形报告帧可如图16所示，在图16中，波束成形报告帧包括选择信息字段，该字段中可包括AP3的标识信息与所述指示信息。AP3在本地标识信息与选择信息字段中的标识信息匹配成功后，读取该字段中的指示信息，若指示信息为信道质量信息，例如：RSSI，AP3可获取该结果。若指示信息为未选中指示信息，则AP3确定未被选中。以及，波束成形报告帧中还包括AP1的MIMO控制字段及波束成形报告字段、AP2的MIMO控制字段以及波束成形报告字段、以及AP3的MIMO控制字段等。可选的，波束成形报告帧还可以如图17所示，其中，AP的标识信息可承载于MIMO控制字段，而不承载于波束成形报告字段与选择信息字段，该帧结构与图12类似，相关描述可参照图12的内容，此处不赘述。
对于2)，各AP的信道测量报告帧可相互独立，例如：AP1的信道测量报告帧中，包括AP1的标识信息及信道状态信息，而不包括其它AP的信息。
例如：AP3的波束成形报告中可包括选择信息字段。选择信息字段作用如上文所述，此处不赘述。波束成形报告帧的帧结构可如图18所示，参照图18，字段中还可包括AP3的MIMO控制字段等其它字段。
需要说明的是，步骤304、步骤305可同时执行或顺序执行，并且执行顺序不做限定。
场景三
结合图3，如图19所示为本申请实施例中的信道探测方法的流程示意图，在图19中：
步骤401至步骤404可参照场景一或场景二中的步骤，此处不赘述。
步骤405，目标AP与STA接收主AP发送的第一数据。
可选的，在本申请中，主AP可以为m个目标AP其中之一，也可以不为目标AP，例如主AP可以为图3中的AP1。
具体的，主AP向目标AP共享第一数据，同时，STA也可接收到主AP共享的第一数据。其中，若STA接收第一数据成功，则进入步骤406。若STA接收第一数据失败，则进入步骤407。
可选的，步骤406，STA发送接收成功响应帧。
具体的，在本申请中，STA可向主AP，或者，向主AP与其它目标AP发送接收成功响应帧，用于告知主AP，或者，主AP与其它目标AP第一数据接收成功。主AP或者，主AP与其它目标AP可删除缓存的第一数据，从而降低设备压力。
步骤407，STA向m个目标AP中的p个重传AP发送重传请求帧，重传请求帧用于指示p个重传AP重新发送第一数据。
具体的，在本申请中，若STA接收第一数据失败，则，STA可从m个目标AP中选择p个重传AP，并向p个重传AP发送重传请求帧，该重传请求帧用于指示重传AP向STA重传第一数据。
可选的，在本申请中，STA可选择主AP(例如图3中的AP1)作为重传AP。相应的，STA向主AP发送重传请求帧，用于指示主AP重传第一数据。
可选的，在本申请中，STA可选择除主AP，或者是，除前一次发送第一数据的AP以外的目标AP作为重传AP。可选的，重传AP的数量可大于或等于1且小于或等于m。
可选的，在本申请中，STA选择p个重传AP可参照预设规则。可选的，预设规则可以为：从m各目标AP中选择信道状态最好的p个AP等规则，本申请不做限定。
可选的，在本申请中，重传请求帧中包括但不限于：重传模式字段、重传AP信息字段、和/或发送地址指示字段。其中，重传模式字段，可用于指示重传AP是否采用联合传输重传第一数据。可选的，重传模式字段中置1可表示联合传输，置0可表示非联合传输。可选的，重传请求帧中还可以包括发送地址指示字段，用于指示重传AP发送的第一数据中携带的地址信息。可选的，发送地址指示字段为前一次发送第一数据的AP的地址信息。可选的，地址信息可以为MAC地址信息。
可选的，重传请求帧中还可以包括目的地址字段(或可称为接收地址字段(Receiving Address,RA))以及重传AP信息字段，其中，目的地址字段为广播地址或重传AP的地址信息；重传AP信息字段可包括重传AP的标识信息。可选的，标识信息可以为重传AP的MAC地址或AID等信息。
可选的，若重传请求帧的发送方式为广播，则当重传AP信息字段中包括多个AP的标识信息时，则该重传请求帧可不包括重传模式字段。本地标识信息与重传AP信息字段中携带的标识信息匹配成功的AP可确认为重传AP，并与其它重传AP联合传输第一数据。
可选的，若重传请求帧的发送方式为单播，并且STA仅选择一个重传AP，则重传请求帧中可不包括重传AP信息字段和/或重传模式字段。接收到该重传请求帧的AP可确认为重传AP，并采用非联合传输重新传输第一数据。如图20所示为重传请求帧的帧结构示意图，参照图20，重传请求帧中还可以包括发送地址字段(Transmitting Address, TA)、帧控制字段、时长字段、帧校验序列(Frame Check Sequence，FCS)等。
步骤408，p个重传AP发送第一数据。
具体的，在本申请中，接收到重传请求帧的AP重新发送第一数据。
可选的，若接收到重传请求帧的AP为前一次发送第一数据的AP，例如为AP1，并且，重传请求帧指示采用非联合传输。则，主AP在接收到重传请求帧后，向STA重新发送第一数据。
可选的，若接收到重传请求帧的AP非前一次发送第一数据的AP，例如为AP2。AP2识别重传请求帧中的重传AP信息字段是否包括多个AP的指示信息和/或联合传输指示，若包括，则AP2与其它重传AP重新传输第一数据。若不包括，则AP2向STA重新传输第一数据。可选的，若AP2接收到的重传请求帧中还包括发送地址指示字段，且发送地址指示字段中包括前一次发送第一数据的AP的地址信息，则AP2重新传输的第一数据中包括前一次发送第一数据的AP的地址信息，例如，AP1的地址信息。
步骤409，STA对接收到的第一数据进行解码，获取解码后的第一数据。
具体的，STA接收重传AP发送的第一数据，并对第一数据进行解码，以获取解码后的第一数据。
可选的，若STA重新接收到的第一数据中所携带的地址信息与前一次接收到的第一数据所携带的地址信息相同，则STA可对本次与前一次接收到的第一数据进行联合软解码，从而提高解码准确率。可选的，STA可对多次接收到的，具有相同地址信息的第一数据执行联合软解码，也就是说，STA可在每次接收第一数据失败后，指示重传AP重传第一数据，并且重传请求帧中携带的发送地址指示字段的内容一致，用于指示每次重传AP重传的第一数据包括相同的地址信息。
可选的，在本申请中，为实现上述协作传输方式，STA和/或AP可发送动态AP选择指示，用于指示重传数据时采用STA动态选择重传AP的方式。可选的，动态AP选择指示可承载于物理层协议数据单元的物理前导码中。可选的，物理前导码可以为AP发送的NDP的物理前导码，还可以为第一数据的物理前导码，本申请不做限定。一种物理层协议数据单元的结构示意图如图21所示，其中，物理前导码可包括至少一个信令字段(Signaling Field，SIG)，该信令字段也可以称为下一代信令字段，信令字段可包括AP协作(collaboration)字段。一个示例中，AP协作字段的取值所对应的功能可以如表4所示。
表4
Figure PCTCN2020102333-appb-000004
Figure PCTCN2020102333-appb-000005
需要说明的是，本申请中的各表中的各字段对应的取值可根据实际需求进行设置，本申请不做限定。
可选的，场景三中的协作传输方式还可以应用于如图22所示的应用场景中，当然场景三中的协作传输方式还可以应用于其他场景，图22仅是示例性的。在图22中，AP1与AP3对STA1进行协作传输，AP2与AP3对STA2进行协作传输。具体的，AP1向STA1发送第二数据时，将第二数据共享给AP3。AP2向STA2发送第三数据时，将第三数据数据共享给AP3。
可选的，与场景三中类似，若STA1接收AP1发送的第二数据失败，则STA1可选择AP1，或者，AP3，或者，AP1和AP3作为重传AP，并向重传AP发送重传请求，指示重传AP重传第二数据。重传方式可参照场景三，此处不赘述。对于STA2，同样可选择AP2，或者AP3，或者AP2和AP3作为重传AP，具体细节可参照场景三，此处不赘述。
可选的，在如图22所示的写作传输架构中，AP1与AP2可在同一时刻，或不同时刻发送数据。可选的，若AP1与AP2在不同时刻发送数据，AP3可分别缓存第二数据与第三数据，并且，若AP3被STA1选为重传AP，则AP3向STA1重新发送第二数据。若AP3被STA2选为重传AP，则AP3向STA2重新发送第三数据。
可选的，若AP1与AP2在同一时刻发送数据，AP3可分别缓存第二数据与第三数据，或者，AP3还可将第二数据与第三数据合并。也就是说，若AP3被STA1选为重传AP，则AP3向STA1重新发送的数据合并后的数据。需要说明的是，如果是合并后的数据，则STA1和/或STA2需采用异或的方式对合并后的数据进行解码，也获取第二数据或第三数据。
上述主要从各个网元之间交互的角度对本发明实施例提供的方案进行了介绍。可以理解的是，STA和AP为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本发明实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本发明实施例可以根据上述方法示例对AP和STA进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本发明实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划 分，实际实现时可以有另外的划分方式。
在采用对应各个功能划分各个功能模块的情况下，图23示出了上述实施例中所涉及的STA侧的通信装置100的一种可能的结构示意图，如图23所示，装置100可以包括：收发模块11、获取模块12。其中，收发模块11可以用于支持STA执行“接收n个AP发送的信道探测帧”，例如，可以支持STA执行上述实施例中的步骤102、步骤202、步骤302、步骤402。或者，收发模块11还可以用于支持STA执行“发送信道测量报告帧”的步骤，例如，可以支持STA执行上述实施例中的步骤104、步骤204、步骤304、步骤404。或者，收发模块11还可以用于支持STA执行“发送指示帧”的步骤，例如，可以支持STA执行上述实施例中的步骤205、步骤305、步骤405。或者，收发模块11还可以用于支持STA执行“发送或接收反馈类型指示”的步骤。或者，收发模块11还可以用于支持STA执行“接收主AP发送的第一数据”的步骤，例如，可支持STA执行上述实施例中的步骤405。或者，收发模块11还可以用于支持STA执行“若第一数据接收失败，则向m个目标AP中的p个重传AP发送重传请求帧”的步骤，例如，可支持STA执行上述实施例中的步骤407。或者，收发模块11还可以用于支持STA执行“接收重传AP重传的第一数据”的步骤，例如，可支持STA执行上述实施例中的步骤409。获取模块21可以用于支持STA执行“基于信道探测帧进行信道探测，获取每个AP的信道状态信息”的步骤，例如，可以支持STA执行上述实施例中的步骤102、步骤202、步骤302、步骤402。
可选的，如图23所示，装置100还可以包括解码模块13，可以用于支持STA执行“基于重传AP重传的第一数据以及主AP发送的第一数据，执行联合软解码，获取解码后的第一数据”的步骤，例如，可支持STA执行上述实施例中的步骤408。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在另一个示例中，图24示出了本申请实施例的另一种STA侧的通信装置200的示意性框图。本申请实施例的装置200可以是上述方法实施例中的STA，装置200可以用于执行上述方法实施例中的STA的部分或全部功能。该装置200可以包括：处理器21，基带电路23、频电路24以及天线25，可选的，该装置200还可以包括存储器22。装置200的各个组件通过总线26耦合在一起，其中总线26除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统26。
处理器21可用于实现对STA的控制，用于执行上述实施例中由STA进行的处理，可以执行上述方法实施例中涉及STA的处理过程和/或用于本申请所描述的技术的其他过程，还可以运行操作系统，负责管理总线以及可以执行存储在存储器中的程序或指令。
基带电路23、射频电路24以及天线25可以用于支持STA和上述实施例中涉及的AP或站点之间收发信息，以支持STA与其他节点之间进行无线通信。一个示例中，由基带电路23编码，按协议封装后生成的信令或数据，经由射频电路进行模拟转换、滤波、放大和上变频等处理后，再经由天线25发送给AP。又一个示例中，来自AP发送的信道探测帧经由天线25接收，由射频电路24进行滤波、放大、下变频以及数字化等处理 后，再经由基带电路23解码、按协议解封装数据等基带处理后，由处理器21进行处理来恢复站点所发送的业务数据和信令信息。可以理解的，基带电路23、射频电路24以及天线25还可以用于支持STA与其他网络实体进行通信，例如,用于支持STA与核心网侧的网元进行通信。
存储器22可以用于存储STA的程序代码和数据，本领域技术人员很容易明白，存储器22或其任意部分可位于装置200之外。举例来说，存储器22可以包括传输线、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21通过总线接口26来访问。可替换地，存储器22或其任意部分可以集成到处理器21中，例如，可以是高速缓存和/或通用寄存器。
可以理解的是，图24仅仅示出了STA的简化设计。例如，在实际应用中，STA可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本发明的STA都在本发明的保护范围之内。
如图25所示为本申请实施例的接入点侧的装置300的示意性框图。在一个实施例中，图25所示的装置300可以对应于上述方法实施例中的AP侧的装置，可以具有方法中的AP的任意功能，可选的，本申请实施例的装置300可以是AP，也可以是AP内的芯片。该装置300可以包括收发模块31和处理模块32，可选的，该装置300还可以包括存储模块33。存储模块33可以用于缓存全部或部分的第一数据。
该收发模块31，可以理解的，可以包括接收模块和发送模块，接收模块可以用于接收前述方法实施例中的步骤104、步骤204、步骤304、步骤404、步骤405、步骤406中STA发送的信令或数据。发送模块可以用于发送前述实施例中的步骤101，步骤201、步骤301、步骤401、步骤405、步骤408中的信令或数据。
该处理模块32，可以用于执行前述方法实施例中基于信道状态信息的反馈信息，确定是否被STA选中参与协作传输的相关步骤。
应理解，根据本申请实施例的装置300可对应于前述的实施例的各方法中的AP，并且装置300中的各个模块的上述和其它管理操作和/或功能分别为了实现前述各个方法的相应步骤，为了简洁，在此不再赘述。
在另一个示例中，图26示出了本申请实施例的另一种AP侧的通信装置400的示意性框图。本申请实施例的装置400可以是上述方法实施例中的AP，装置400可以用于执行上述方法实施例中的AP的部分或全部功能。该装置400可以包括：处理器41，基带电路43，射频电路44以及天线45，可选的，该装置400还可以包括存储器42。装置400的各个组件通过总线46耦合在一起，其中总线系统46除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统46。
处理器41可用于实现对AP的控制，用于执行上述实施例中由AP进行的处理，可以执行上述方法实施例中涉及AP的处理过程和/或用于本申请所描述的技术的其他过程，还可以运行操作系统，负责管理总线以及可以执行存储在存储器中的程序或指令。
基带电路43、射频电路44以及天线45可以用于支持AP和上述实施例中涉及的STA或AP收发信息，以支持AP与其他节点之间进行无线通信。一个示例中，来自STA发 送的信令或数据，例如：信道测量报告帧，经由天线45接收，由射频电路44进行滤波、放大、下变频以及数字化等处理后，再经由基带电路43解码、按协议解封装数据等基带处理后，由处理器41进行处理来恢复站点所发送的业务数据和信令信息；又一个示例中，AP发送的协作响应消息可由处理器41进行处理，经由基带电路43进行按协议封装，编码等基带处理，进一步由射频电路44进行模拟转换、滤波、放大和上变频等射频处理后，经由天线45发送给STA。可以理解的，基带电路43、射频电路44以及天线45还可以用于支持AP与其他网络实体进行通信，例如,用于支持AP与核心网侧的网元进行通信。
存储器42可以用于存储AP的程序代码和数据，存储器42可以是图25中的存储模块33。图26中存储器42被示为与处理器41分离，然而，本领域技术人员很容易明白，存储器42或其任意部分可位于装置400之外。举例来说，存储器42可以包括传输线、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41通过总线接口46来访问。可替换地，存储器42或其任意部分可以集成到处理器41中，例如，可以是高速缓存和/或通用寄存器。
可以理解的是，图26仅仅示出了AP的简化设计。例如，在实际应用中，AP可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本发明的AP都在本发明的保护范围之内。
本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，所述指令可以由处理电路上的一个或多个处理器执行。当其在计算机上运行时，使得计算机执行上述各方面所述的方法。可选的，所述计算机存储介质是非易失性可读存储介质。
本申请实施例还提供了一种芯片系统，该芯片系统包括处理器，用于支持STA或AP以实现上述实施例中所涉及的功能，例如生成或处理上述方法中所涉及的数据和/或信息。
在一种可能的设计中，所述芯片系统还可以包括存储器，所述存储器，用于保存分STA或AP必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件，处理器用于执行所述程序指令，以使得安装所述芯片系统的通信装置实现上述任一实施例中所涉及的AP或STA的方法和功能。可选的，该存储器可位于处理器外部，为外部存储介质，还可以位于处理器内部，为处理器的内部存储介质。
本申请实施例还提供了一种处理器，用于与存储器耦合，用于执行上述各实施例中任一实施例中涉及STA的方法和功能。
本申请实施例还提供了一种处理器，用于与存储器耦合，用于执行上述各实施例中任一实施例中涉及AP的方法和功能。
本申请实施例还提供一种芯片，包括处理电路和输入输出电路，该输入输出电路用于向处理电路输入信令或数据，还用于输出处理电路产生的信令或数据，处理电路用于实现信令或数据的处理，以使得安装所述芯片的通信装置可以实现上述任一实施例中涉及STA的方法和功能。
本申请实施例还提供一种芯片，包括处理电路和输入输出电路，该输入输出电路用于向处理电路输入信令或数据，还用于输出处理电路产生的信令或数据，处理电路用于 实现信令或数据的处理，以使得安装所述芯片的通信装置可以实现上述任一实施例中涉及AP的方法和功能。
本申请实施例还提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行执行上述各实施例中任一实施例中涉及STA的方法和功能。
本申请实施例还提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行执行上述各实施例中任一实施例中涉及AP的方法和功能。
本申请实施例还提供一种无线通信系统，该系统包括上述实施例中涉及的至少一个STA和至少一个AP。
结合本发明实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于AP中。当然，处理器和存储介质也可以作为分立组件存在于AP中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (30)

  1. 一种信道探测方法，其特征在于，包括：
    站点STA接收n个AP发送的信道探测帧，n为大于1的整数；
    所述STA基于所述信道探测帧进行信道探测，获取每个AP的信道状态信息；
    所述STA发送信道测量报告帧，所述信道测量报告帧包括所述n个AP中的m个目标AP的信道状态信息和所述m个目标AP的标识，所述信道测量报告帧还用于指示所述m个目标AP被选中参与协作传输，m为大于1且小于或等于n的整数。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述STA发送指示信息，所述指示信息用于指示(n-m)个非目标AP未被选中参与协作传输。
  3. 根据权利要求2所述的方法，其特征在于，所述指示信息包括所述(n-m)个非目标AP的信道质量信息，和，所述(n-m)个非目标AP的标识；或，
    所述指示信息包括未选中指示信息，和，所述(n-m)个非目标AP的标识，所述未选中指示信息用于指示所述(n-m)个非目标AP未被选中，所述信道质量信息用于指示非目标AP与STA之间信道的信道质量。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述发送信道测量报告帧之前，还包括：
    所述STA发送或接收反馈类型指示，所述反馈类型指示用于指示所述STA反馈信道状态信息的类型，所述STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈；
    其中，所述选择性反馈表示所述STA反馈所述n个AP中的部分AP的信道状态信息，所述非选择性反馈表示所述STA反馈所述n个AP中的每一个AP的信道状态信息。
  5. 根据权利要求1至3中任一项所述的方法，其特征在于，所述信道测量报告帧包括：多输入多输出控制字段，所述多输入多输出控制字段的反馈类型字段为预留值，用于指示所述STA反馈信道状态信息的类型为选择性反馈。
  6. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述STA接收主AP发送的第一数据，其中，所述第一数据为所述m个目标AP之间共享的数据，且所述主AP包含于所述m个目标AP中；
    若所述STA接收第一数据失败，则向所述m个目标AP中的p个重传AP发送重传请求帧，所述重传请求帧用于指示所述p个重传AP重新发送所述第一数据，p为大于或等于1且小于或等于m的整数。
  7. 根据权利要求6所述的方法，其特征在于，其中，
    所述重传请求帧包括以下至少一项：目的地址字段、重传AP信息字段、重传模式字段、以及发送地址指示字段；
    其中，所述目的地址字段为广播地址或所述重传AP的地址；
    所述重传AP信息字段包括所述重传AP的标识信息；
    所述重传模式字段用于指示是否采用联合传输重传所述第一数据；
    所述发送地址指示字段用于指示所述第一数据携带的所述主AP的地址信息。
  8. 根据权利要求6或7任一项所述的方法，其特征在于，若所述p个重传AP不为所述主AP，则所述方法还包括：
    接收所述重传AP重传的第一数据，其中，所述第一数据包括所述主AP的地址信息；
    基于所述重传AP重传的第一数据以及所述主AP发送的第一数据，执行联合软解码，获取联合软解码后的第一数据。
  9. 一种信道探测方法，其特征在于，包括：
    接入点AP发送信道探测帧，所述信道探测帧用于站点STA进行信道探测以获取信道状态信息；
    所述AP接收所述STA发送的反馈信息；
    基于反馈信息，所述AP确定是否被所述STA选中参与协作传输。
  10. 根据权利要求9所述的方法，其特征在于，所述反馈信息为信道测量报告帧，所述基于所述反馈信息，确定所述AP是否被所述STA选中参与协作传输，包括：
    接收所述STA反馈的所述信道测量报告帧，识别所述信道测量报告帧中是否包括所述AP的标识信息与所述AP的信道状态信息；
    若识别到所述标识信息与所述AP的信道状态信息，则确定所述AP被选中参与协作传输。
  11. 根据权利要求9所述的方法，其特征在于，所述反馈信息为指示信息，所述基于所述反馈信息，确定所述AP是否被所述STA选中参与协作传输，包括：
    所述AP接收所述STA发送的所述指示信息，所述指示信息用于指示所述AP未被选中参与协作传输；
    所述AP基于所述指示信息，确定所述AP未被选中参与协作传输。
  12. 根据权利要求11所述的方法，其特征在于，所述指示信息包括所述AP的信道质量信息，和，所述AP的标识；或，
    所述指示信息包括未选中指示信息，和，所述AP的标识，所述未选中指示信息用于指示所述AP未被选中；
    其中，所述信道质量信息用于指示所述AP与所述STA之间信道的信道质量。
  13. 根据权利要求9至12任一项所述的方法，其特征在于，在所述STA反馈所述信道测量报告帧之前，还包括：
    所述AP发送或接收反馈类型指示，所述反馈类型指示用于指示所述STA反馈信道状态信息的类型，所述STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈；
    其中，所述选择性反馈表示所述STA反馈n个AP中的部分AP的信道状态信息，所述非选择性反馈表示所述STA反馈所述n个AP中的每一个AP的信道状态信息。
  14. 根据权利要求9或10所述的方法，其特征在于，所述方法还包括：
    所述AP接收主AP发送给所述AP和所述STA的第一数据；
    所述AP接收所述STA发送的重传请求帧，其中，所述重传请求帧为所述STA接收所述第一数据失败后向所述AP发送的，所述重传请求帧用于指示所述AP重新发送所述第一数据；
    向所述STA发送所述第一数据。
  15. 根据权利要求14所述的方法，其特征在于，其中，所述重传请求帧中包含发送地址指示字段，用于指示发送所述第一数据的主AP的地址信息，所述方法还包括：
    所述AP向所述STA发送包括所述主AP的地址信息的第一数据。
  16. 一种应用于站点STA的通信装置，其特征在于，包括：
    收发模块，用于接收n个AP发送的信道探测帧，n为大于1的整数；
    获取模块，用于基于所述信道探测帧进行信道探测，获取每个AP的信道状态信息；
    所述收发模块还用于发送信道测量报告帧，所述信道测量报告帧包括所述n个AP中的m个目标AP的信道状态信息和所述m个目标AP的标识，所述信道测量报告帧还用于指示所述m个目标AP被选中参与协作传输，m为大于1且小于或等于n的整数。
  17. 根据权利要求16所述的通信装置，其特征在于，
    所述收发模块还用于发送指示信息，所述指示信息用于指示(n-m)个非目标AP未被选中参与协作传输。
  18. 根据权利要求17所述的通信装置，其特征在于，所述指示信息包括所述(n-m)个非目标AP的信道质量信息，和，所述(n-m)个非目标AP的标识；或，
    所述指示信息包括未选中指示信息，和，所述(n-m)个非目标AP的标识，所述未选中指示信息用于指示所述(n-m)个非目标AP未被选中；
    其中，所述信道质量信息用于指示所述非目标AP与所述STA之间信道的信道质量。
  19. 根据权利要求16至18中任一项所述的通信装置，其特征在于，所述收发模块还用于：
    发送或接收反馈类型指示，所述反馈类型指示用于指示所述STA反馈信道状态信息 的类型，所述STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈；
    其中，所述选择性反馈表示所述STA反馈所述n个AP中的部分AP的信道状态信息，所述非选择性反馈表示所述STA反馈所述n个AP中的每一个AP的信道状态信息。
  20. 根据权利要求16至18中任一项所述的通信装置，其特征在于，所述信道测量报告帧包括：多输入多输出控制字段，所述多输入多输出控制字段的反馈类型字段为预留值，用于指示所述STA反馈信道状态信息的类型为选择性反馈。
  21. 根据权利要求16或17所述的通信装置，其特征在于，所述收发模块还用于：
    接收主AP发送的第一数据，其中，所述第一数据为所述m个目标AP之间共享的数据，且所述主AP包含于所述m个目标AP中；
    若所述STA接收第一数据失败，则向所述m个目标AP中的p个重传AP发送重传请求帧，所述重传请求帧用于指示所述p个重传AP重新发送所述第一数据，p为大于或等于1且小于或等于m的整数。
  22. 根据权利要求21所述的通信装置，其特征在于，其中，
    所述重传请求帧中包括目的地址字段、重传AP信息字段、重传模式字段、以及发送地址指示字段；
    其中，所述目的地址字段为广播地址或所述重传AP的地址；
    所述重传AP信息字段包括所述重传AP的标识信息；
    所述重传模式字段用于指示是否采用联合传输重传所述第一数据；
    所述发送地址指示字段用于指示所述第一数据携带所述主AP的地址信息。
  23. 根据权利要求21或22任一项所述的通信装置，其特征在于，若所述p个重传AP不为所述主AP，则所述收发模块还用于：
    接收所述重传AP重传的第一数据，其中，所述第一数据包括所述主AP的地址信息；
    相应的，所述STA还包括解码模块，用于基于所述重传AP重传的第一数据以及所述主AP发送的第一数据，执行联合软解码，获取联合软解码后的第一数据。
  24. 一种应用于接入点AP的通信装置，其特征在于，包括：
    收发模块，用于发送信道探测帧，所述信道探测帧用于站点STA基于所述信道探测帧进行信道探测，并获取信道状态信息；
    所述收发模块，还用于接收所述STA发送的反馈信息；
    处理模块，用于基于所述反馈信息，确定所述AP是否被所述STA选中参与协作传输。
  25. 根据权利要求24所述的通信装置，其特征在于，所述反馈信息为信道测量报告帧，
    所述收发模块还用于接收所述STA反馈的信道测量报告帧；
    所述处理模块还用于识别所述信道测量报告帧中是否包括所述AP的标识信息与所述AP的信道状态信息；
    若识别到所述AP的标识信息与所述AP的信道状态信息，则所述处理模块确定所述AP被选中参与协作传输。
  26. 根据权利要求24所述的通信装置，其特征在于，所述反馈信息包括指示信息
    所述收发模块还用于接收所述STA发送的所述指示信息，所述指示信息用于指示所述AP未被选中参与协作传输；
    所述处理模块还用于基于所述指示信息，确定所述AP未被选中参与协作传输。
  27. 根据权利要求26所述的通信装置，其特征在于，所述指示信息包括所述AP的信道质量信息，和，所述AP的标识；或，
    所述指示信息包括未选中指示信息，和，所述AP的标识，所述未选中指示信息用于指示所述AP未被选中。
  28. 根据权利要求24至27任一项所述的通信装置，其特征在于，所述收发模块还用于：
    发送或接收反馈类型指示，所述反馈类型指示用于指示所述STA反馈信道状态信息的类型，所述STA反馈信道状态信息的类型包括：选择性反馈和非选择性反馈；
    其中，所述选择性反馈表示所述STA反馈所述n个AP中的部分AP的信道状态信息，所述非选择性反馈表示所述STA反馈所述n个AP中的每一个AP的信道状态信息。
  29. 根据权利要求24所述的通信装置，其特征在于，所述收发模块还用于：
    接收主AP发送给所述AP和所述STA的第一数据；
    接收所述STA发送的重传请求帧，其中，所述重传请求帧为所述STA接收所述第一数据失败后向所述AP发送的，所述重传请求帧用于指示所述AP重新发送所述第一数据；
    向所述STA发送所述第一数据。
  30. 根据权利要求29所述的通信装置，其特征在于，其中，所述重传请求帧中包含发送地址指示字段，用于指示发送所述第一数据的主AP的地址信息，所述收发模块还用于：
    向所述STA发送包括所述主AP的地址信息的第一数据。
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