WO2016058155A1 - 一种无线局域网的通信方法、站点和通信系统 - Google Patents

一种无线局域网的通信方法、站点和通信系统 Download PDF

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Publication number
WO2016058155A1
WO2016058155A1 PCT/CN2014/088720 CN2014088720W WO2016058155A1 WO 2016058155 A1 WO2016058155 A1 WO 2016058155A1 CN 2014088720 W CN2014088720 W CN 2014088720W WO 2016058155 A1 WO2016058155 A1 WO 2016058155A1
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Prior art keywords
station
value
site
signal
transmit power
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PCT/CN2014/088720
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English (en)
French (fr)
Inventor
廖湘柏
刘应状
庞继勇
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华为技术有限公司
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Priority to CN201480082032.9A priority Critical patent/CN106688303B/zh
Priority to PCT/CN2014/088720 priority patent/WO2016058155A1/zh
Publication of WO2016058155A1 publication Critical patent/WO2016058155A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a communication method, a station, and a communication system of a wireless local area network.
  • the existing WIFI channel access mechanism is generally CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance).
  • CSMA/CA Carrier Sense Multiple Access/Collision Avoidance
  • the basic idea is that the transmitting end uses the energy detection, carrier detection or energy carrier hybrid detection to determine the current channel occupancy status. To avoid interference. If the received signal strength detected by the transmitting end is higher than the CCA (clear channel assessment) threshold, the channel is in the occupied state, and the transmitting end continues to wait; otherwise, the transmitting end attempts to perform channel access.
  • CCA carrier Sense Multiple Access/Collision Avoidance
  • the basic CSMA/CA can only guarantee that no other stations will preempt the channel at the same time in the communication range of the transmitting end, but it cannot avoid the "hidden terminal" outside the receiving end of the receiving end and preempt the channel pair.
  • the impact of receiving data at the receiving end. Therefore, an interference avoidance method based on RTS (request to send)/CTS (clear to send) is proposed to solve the problem of "hidden terminal", that is, the transmitting end detects that the channel is idle for a period of time, and then transmits Before the data, the RTS frame is sent to the receiving end.
  • the transmitting end sends the data after waiting for the receiving end to respond to the CTS frame.
  • the transmitting end and the receiving end pass the RTS/CTS handshake procedure to ensure that the data will not be collided when transmitting data.
  • FIG. 1 is an example of RTS/CTS interference avoidance implementation.
  • Site A is the transmitting end
  • station B is the receiving end
  • stations A, D, and E are in the signal coverage area of station B.
  • station B sends feedback to station A.
  • the sites D and E also receive the CTS frame.
  • neither the site D nor the site E can transmit the data. That is to say, even if the interference of the data transmitted by the site D or the site E to the site B is within the range allowed by the site B, the site D or the site E cannot transmit the data, thereby reducing the spectrum utilization rate.
  • Embodiments of the present invention provide a communication method, a station, and a communication system for a wireless local area network, which can Improve spectrum utilization.
  • a first aspect of the embodiments of the present invention provides a WLAN station, where the site is a first site in a signal coverage area of a second site that has competed to the communication channel in a basic service set, and the first site includes:
  • a frame receiving module configured to receive a control frame broadcast by the second station, where the control frame carries a signal to noise ratio tolerance of the second station;
  • a transmission path loss value obtaining module configured to acquire, according to the received power of the control frame, and the transmit power of the second station transmitting the control frame, the transmission of the communication link of the second station to the first station Path loss value;
  • a transmit power determining module configured to determine an upper limit value of the transmit power according to the transmission path loss value and a signal to noise ratio tolerance of the second station
  • the signal processing module is configured to: according to the upper limit value of the transmit power determined by the module according to the transmit power, send or not send a data packet to a target station in a basic service set where the first station is located.
  • the transmit power determining module includes:
  • a first transmission power determining unit configured to determine an upper limit value of the transmission power according to a formula P 1 -PL 1,2 ⁇ SNR 2 margin ⁇ N 0 ;
  • P 1 is the upper limit of the transmit power
  • PL 1,2 is the transmission path loss value
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the signal processing module is specifically configured to:
  • the upper limit value of the transmit power is higher than a minimum value of the preset transmit power threshold, determining a target transmit power according to the transmit power threshold and an upper limit value of the transmit power, the target transmit power Between the minimum value and the upper limit value;
  • the signal processing module is further configured to:
  • the data packet is not sent when the second station that has contend for the communication channel occupies the communication channel.
  • the method further includes:
  • a frame transmitting module configured to transmit an interference value request frame
  • the frame receiving module is further configured to:
  • a site obtaining module configured to acquire, according to a control frame fed back by the site in the basic service set of the first site, a site whose interference intensity value is less than a preset threshold;
  • the target site determining module is configured to determine the target site in the site where the interference intensity value is less than a preset threshold.
  • the target site determining module includes:
  • a first determining unit configured to determine a site corresponding to the smallest interference intensity value as the target site.
  • the target site determining module includes:
  • a transmission path loss value acquiring unit configured to acquire, according to the control frame sent by the station whose interference intensity value is less than a preset threshold, respectively, the communication link of the station whose interference intensity value is less than a preset threshold to the first station Transmission path loss value;
  • a second determining unit configured to determine a site corresponding to the minimum of the transmission path loss value as the target site.
  • the target site determining module includes:
  • a transmission path loss value acquiring unit configured to acquire, according to the control frame sent by the station whose interference intensity value is less than a preset threshold, respectively, the communication link of the station whose interference intensity value is less than a preset threshold to the first station Transmission path loss value;
  • a third determining unit configured to minimize a sum of the transmission path loss value and the interference intensity value The site corresponding to the value is determined to be the target site.
  • the interference source site includes a source site that has competed to the communication channel in the basic service set.
  • the ninth possible implementation manner further includes:
  • a channel matrix information estimating module configured to estimate channel matrix information of the second station to the first station according to the control frame broadcast by the second station;
  • the transmit power determining module includes:
  • a second transmit power determining unit configured to determine an upper limit value of the transmit power according to the transmission path loss value, a signal to noise ratio tolerance of the second station, and the channel matrix information.
  • the second sending power determining unit is specifically configured to:
  • P 1 is an upper limit value of the transmission power
  • PL 1 , 2 is the transmission path loss value
  • ⁇ 2 is a channel estimation error
  • SNR 2 margin is a signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the Cold(A) operator represents any d column of the decimation matrix A, d is the number of data streams sent by the first station, and A H represents the conjugate of the matrix A.
  • a matrix, tr(A) represents the trace of matrix A, and A -1 represents the inverse matrix of matrix A,
  • a second aspect of the embodiments of the present invention provides a site of a wireless local area network, where the site is a second site in which a basic service set has contend for a communication channel, and the second site includes:
  • a frame receiving module configured to receive a request sending frame sent by a station in a basic service set where the second station is located;
  • a signal to noise ratio tolerance obtaining module configured to send a frame according to the request to obtain a signal to noise ratio tolerance
  • a frame transmitting module configured to broadcast a control frame carrying the signal to noise ratio tolerance, so that the first station in the coverage area of the second station signal determines the transmission of the first station according to the signal to noise ratio tolerance An upper limit value of the power, and causing the first station to transmit or not transmit a data packet according to the determined upper limit value of the transmit power.
  • the SNR tolerance acquiring module includes:
  • a receiving signal to noise ratio value acquiring unit configured to acquire a received signal to noise ratio value of the request sending frame
  • the signal to noise ratio tolerance determining unit is configured to determine the signal to noise ratio tolerance according to a difference between the received signal to noise ratio value and a preset minimum reference signal to noise ratio value.
  • control frame includes allowing a frame to be sent
  • the frame transmitting module is specifically configured to:
  • a third aspect of the embodiments of the present invention provides a communication method of a wireless local area network, including:
  • control frame broadcast by the second station where the control frame carries a signal to noise ratio tolerance of the second station, where the second station is a site in a basic service set that has contend for a communication channel;
  • a data packet is sent or not transmitted to a target station in a basic service set in which the own station is located.
  • the determining, by using the transmission path loss value and a signal to noise ratio tolerance of the second station, an upper limit value of the transmit power includes:
  • P 1 is the upper limit of the transmit power
  • PL 1,2 is the transmission path loss value
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the determining, according to the determined upper limit value of the transmit power, is directed to a basic service set in which the own site is located
  • the data sent by the target site includes:
  • the data packet is transmitted to the target station in the basic service set where the own station is located by the target transmission power.
  • the determining, according to the determined upper limit value of the transmit power, The target site in the basic service set where the own site is located does not send data including:
  • the data packet is not sent when the second station that has contend for the communication channel occupies the communication channel.
  • the target site is determined in the station where the interference strength value is less than a preset threshold.
  • the determining, by the site that the interference strength value is less than a preset threshold, the target site includes:
  • a site corresponding to the smallest of the interference intensity values is determined as the target site.
  • determining, in the station where the interference strength value is less than a preset threshold, the target site includes:
  • a station corresponding to the smallest transmission path loss value is determined as the target station.
  • Determining, in the station where the interference strength value is less than a preset threshold, determining the target site includes:
  • a station corresponding to a minimum value of the sum of the transmission path loss value and the interference intensity value is determined as the target station.
  • the interference source site includes a source site in the basic service set that has contend for a communication channel.
  • the determining according to the transmission path loss value and the second site Before the signal-to-noise ratio tolerance determines the upper limit of the transmit power it also includes:
  • Determining an upper limit value of the transmit power according to the transmission path loss value and the signal to noise ratio tolerance of the second station includes:
  • the upper limit of the transmit power includes:
  • P 1 is an upper limit value of the transmission power
  • PL 1 , 2 is the transmission path loss value
  • ⁇ 2 is a channel estimation error
  • SNR 2 margin is a signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the Cold(A) operator represents any d column of the decimation matrix A, d is the number of data streams transmitted by its own station, and A H represents the conjugate matrix of the matrix A, tr (A) represents the trace of matrix A, and A -1 represents the inverse matrix of matrix A, Channel matrix information from the own station to the second station in the M ⁇ N dimension estimated by the own station according to the estimated channel matrix of the second station to the own station and using the channel reciprocity; M and N represent the number of antennas of the second station and its own station, respectively.
  • a fourth aspect of the embodiments of the present invention provides a communication method of a wireless local area network, including:
  • Broadcasting a control frame carrying the signal to noise ratio tolerance so that the first station in the coverage area of the own station signal determines an upper limit value of the transmit power of the first station according to the signal to noise ratio tolerance, and The first station sends or does not send a data packet according to the determined upper limit value of the transmit power.
  • the acquiring a signal to noise ratio tolerance according to the request sending frame includes:
  • the signal to noise ratio tolerance is determined according to a difference between the received signal to noise ratio value and a preset minimum reference signal to noise ratio value.
  • control frame includes allowing a frame to be sent
  • Broadcasting the control frame carrying the SNR tolerance includes:
  • a fifth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the steps of the wireless local area network communication method provided by the third aspect.
  • a sixth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium stores a program, and the program includes some or all of the steps of the wireless local area network communication method provided by the fourth aspect.
  • a seventh aspect of the embodiments of the present invention provides a station of a wireless local area network, where the station is a first station in a signal coverage area of a second station that has competed to the communication channel in a basic service set, and the first station includes a wireless signal.
  • a transceiver device a memory, and a processor, wherein the memory stores a set of program codes, and the processor is configured to call program code stored in the memory to perform the following operations:
  • a data packet is sent or not sent to a target station in a basic service set where the first station is located.
  • An eighth aspect of the embodiments of the present invention provides a station of a wireless local area network, where the station is a second station in which a basic service set has contend for a communication channel, and the second station includes a wireless signal transceiver device, a memory, and a processor, where And storing, in the memory, a set of program codes, and the processor is configured to invoke program code stored in the memory, to perform the following operations:
  • a ninth aspect of the embodiments of the present invention provides a wireless local area network communication system, where the system includes at least a first station and a second station, where:
  • the first site is as in the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, or the third possible implementation of the first aspect, or the first a fourth possible implementation of the aspect, or a fifth possible implementation of the first aspect, or a sixth possible implementation of the first aspect, or a seventh possible implementation of the first aspect, or An eighth possible implementation on the one hand, or a ninth possible implementation of the first aspect, or a site in the tenth possible implementation of the first aspect;
  • the second site is the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect.
  • the second station when receiving the request to send the frame, may acquire the SNR tolerance and broadcast the control frame carrying the SNR tolerance.
  • the first station receives the control frame
  • the first station One The station may obtain a transmission path loss value of the communication link of the second station to the first station, and determine an upper limit value of the transmission power according to the transmission path loss value and the signal to noise ratio tolerance of the second station, and according to the determined transmission
  • the upper limit of the power may be sent to the target station in the basic service set where the first station is located.
  • the first station when the second station receives the data, the first station must not transmit the data packet, Spectrum utilization.
  • FIG. 1 is a schematic structural diagram of an RTS/CTS interference avoidance example in the prior art
  • FIG. 2 is a schematic structural diagram of a station of a wireless local area network according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a transmit power determining module according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another WLAN station according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a target site determining module according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another station of a wireless local area network according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a station of a wireless local area network according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a signal to noise ratio tolerance acquiring module according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another WLAN station according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart diagram of a communication method of a wireless local area network according to an embodiment of the present invention.
  • FIG. 11 is a schematic flowchart of another wireless local area network communication method according to an embodiment of the present invention.
  • FIG. 12 is a schematic flowchart diagram of still another method for communicating a wireless local area network according to an embodiment of the present invention.
  • FIG. 13 is a schematic flowchart diagram of a method for determining a target site according to an embodiment of the present invention.
  • FIG. 14 is a schematic flowchart diagram of still another method for communicating a wireless local area network according to an embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of a wireless local area network communication system according to an embodiment of the present invention.
  • a plurality of stations want to use a channel, and the first backoff end preempts the source station of the channel to send an RTS frame, if the destination station corresponding to the receiving address in the RTS frame detects the RTS frame and feeds back a CTS frame thereto, and the source If the station successfully receives the CTS frame, the station pair obtains the channel usage right, and the station establishes the communication link as the first communication link (ie, the primary communication link), in the first communication link communication process.
  • the communication link established by the station in the signal coverage area of the destination station with other stations is referred to as a second communication link (ie, a secondary communication link).
  • the present invention can be applied to an uplink and downlink communication link, and the present invention can also be extended to a plurality of second communication links. The present invention is not limited. For ease of understanding, the following embodiments are described by taking a second communication link as an example.
  • FIG. 2 is a schematic structural diagram of a station of a wireless local area network according to an embodiment of the present invention.
  • the station provided by the embodiment of the present invention may include a communication device such as an AP (wireless access point) or an STA (station).
  • the site is a first site within a signal coverage area of a second site that has competed to the communication channel in a basic service set.
  • the station 20 in this embodiment shown in FIG. 2 can include at least a frame receiving module 21, a transmission path loss value obtaining module 22, a transmitting power determining module 23, and a signal processing module 24, where:
  • the frame receiving module 21 is configured to receive a control frame broadcast by the second station, where the control frame carries a signal to noise ratio tolerance of the second station.
  • the transmission path loss value obtaining module 22 is configured to acquire the communication link of the second station to the first station according to the received power of the control frame and the transmit power of the second station transmitting the control frame. Transmission path loss value.
  • the transmission path loss value obtaining module 22 may use the difference between the transmit power of the control frame and the received power of the control frame as the transmission path loss value of the communication link of the second station to the first station.
  • a transmit power determining module 23 configured to determine, according to the transmission path loss value, the second site The signal to noise ratio tolerance determines the upper limit of the transmit power.
  • the transmit power determining module 23 may further include a first transmit power determining unit 231 for determining an upper limit of the transmit power according to the formula P 1 -PL 1,2 ⁇ SNR 2 margin ⁇ N 0 as shown in FIG. 3 . value;
  • P 1 is the upper limit of the transmit power
  • PL 1,2 is the transmission path loss value
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the signal processing module 24 is configured to send or not send a data packet to the target station in the basic service set where the first station is located according to the upper limit value of the transmit power determined by the transmit power determining module 23.
  • the signal processing module may be specifically configured to:
  • the target transmit power determines a target transmit power according to the transmit power threshold and an upper limit value of the transmit power, the target transmit power a maximum value between the minimum value and the upper limit value and not higher than a preset transmit power threshold;
  • the signal processing module 24 can also be specifically used to:
  • the data packet is not sent when the second station that has contend for the communication channel occupies the communication channel.
  • the signal processing module 24 may determine whether the upper limit of the transmit power is higher than a minimum of the preset transmit power threshold of the first station. If yes, indicating that the target transmit power exists in the preset transmit power threshold, and the interference of the target transmit transmit data packet to the second site is within the signal to noise ratio tolerance range of the second site, determining the target transmit power, Transmitting, by the target transmit power, the data packet to the target station; otherwise, indicating that the interference of the second station by using any transmit power of the preset transmit power threshold exceeds the signal to noise ratio of the second station. For the tolerance, the second station cannot normally receive the data sent by the source station, and the data packet is not sent when the second station occupies the communication channel.
  • the station 20 may further include a frame transmitting module 25, a site selecting module 26, and a target site determining module 27 as shown in FIG. 4, wherein:
  • a frame transmitting module 25 configured to transmit an interference value request frame
  • the frame receiving module 26 is further configured to:
  • the interference request frame may include a request sending frame.
  • the frame transmitting module 25 may send a request sending frame, and the frame receiving module 21 receives the first basic service set site. Sending a frame to allow transmission of frames according to the request;
  • the interference value request frame and the request transmission frame may also be mutually independent frames.
  • the site selection module 26 is configured to obtain a site whose interference intensity value is less than a preset threshold according to a control frame fed back by the site in the basic service set.
  • the target site determining module 27 is configured to determine the target site in the site where the interference strength value is less than a preset threshold.
  • the target site determining module may specifically include a first determining unit 271, configured to determine a site corresponding to the smallest interference intensity value as the target site.
  • the target site determining module may specifically include a transmission path loss value acquiring unit 272 and a second determining unit 273, as shown in FIG. 5, where:
  • the transmission path loss value obtaining unit 272 is configured to acquire, according to the control frame sent by the station whose interference intensity value is less than the preset threshold, the communication link of the station whose interference intensity value is less than a preset threshold to the first station. Transmission path loss value;
  • the second determining unit 273 is configured to determine a station corresponding to the smallest transmission path loss value as the target station.
  • the target site determining module may specifically include a transmission path loss value acquiring unit 272 and a second determining unit 274, as described in FIG. 5, where:
  • the transmission path loss value obtaining unit 272 is configured to acquire, according to the control frame sent by the station whose interference intensity value is less than the preset threshold, the communication link of the station whose interference intensity value is less than a preset threshold to the first station. Transmission path loss value;
  • the third determining unit 274 is configured to determine, as the target station, a site corresponding to a minimum value of the sum of the transmission path loss value and the interference strength value.
  • the station 20 may further include a channel matrix information estimating module 28, configured to estimate channel matrix information of the second station to the first station according to the control frame broadcast by the second station. ;
  • the transmit power determining module 23 further includes, as shown in FIG. 3, the following:
  • the second transmit power determining unit 232 is configured to determine an upper limit value of the transmit power according to the transmission path loss value, a signal to noise ratio tolerance of the second station, and the channel matrix information.
  • the second transmission power determining unit 232 can be according to a formula
  • P 1 is an upper limit value of the transmission power
  • PL 1 , 2 is the transmission path loss value
  • ⁇ 2 is a channel estimation error
  • SNR 2 margin is a signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the Cold(A) operator represents any d column of the decimation matrix A, d is the number of data streams sent by the first station, and A H represents the conjugate of the matrix A.
  • a matrix, tr(A) represents the trace of matrix A, and A -1 represents the inverse matrix of matrix A,
  • FIG. 6 is a schematic structural diagram of another station according to an embodiment of the present invention.
  • the site is a first site in a signal coverage area of a second site that has competed to the communication channel in a basic service set
  • the site 60 may include: at least one processor 61, such as a CPU, at least one Communication bus 62, wireless signal transceiver 63 and memory 64.
  • the wireless signal transceiver unit 63 is configured to receive a control frame broadcasted by the second station and a control frame that is requested by the station in the basic service set where the first station is located according to the interference value; the communication bus 62 is used to implement these components. Connection communication between.
  • the memory 64 may be a high speed RAM memory, or may be a non-volatile memory such as at least one disk memory, a memory 64 storing a set of program codes, and a processor 61 for calling a program stored in the memory 64. Code to do the following:
  • a data packet is sent or not sent to a target station in a basic service set where the first station is located.
  • the processor 61 calls the program code stored in the memory 64 to determine the upper limit value of the transmit power according to the transmission path loss value and the signal to noise ratio tolerance of the second station.
  • P 1 is the upper limit of the transmit power
  • PL 1,2 is the transmission path loss value
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the processor 61 calls the program code stored in the memory 64 according to the determined upper limit value of the transmit power, and the data may be sent to the target station in the basic service set where the first station is located.
  • the data packet is transmitted by the wireless transmitting module 63 to the target station in the basic service set where the first station is located with the target transmit power.
  • the processor 61 calls the program code stored in the memory 64 according to the determined upper limit value of the transmit power, and the data may be sent to the target station in the basic service set where the first station is located.
  • the data packet is not sent when the second station that has contend for the communication channel occupies the communication channel.
  • the processor 61 calls the program code stored in the memory 64 to perform the following operations before sending the data packet to the target station in the basic service set where the first station is located according to the determined upper limit value of the transmit power:
  • the target site is determined in the station where the interference strength value is less than a preset threshold.
  • the processor 61 calls the program code stored in the memory 64 to determine, in the station where the interference strength value is less than a preset threshold, that the target site may be:
  • a site corresponding to the smallest of the interference intensity values is determined as the target site.
  • the processor 61 calls the program code stored in the memory 64 to determine, in the station where the interference strength value is less than a preset threshold, that the target site may be:
  • a station corresponding to the smallest transmission path loss value is determined as the target station.
  • the processor 61 calls the program code stored in the memory 64 to determine that the target site is specifically in the station whose interference strength value is less than a preset threshold:
  • a station corresponding to a minimum value of the sum of the transmission path loss value and the interference intensity value is determined as the target station.
  • the interference source site comprises a source site that has competed to the communication channel in the basic service set.
  • processor 61 calls the program code stored in the memory 64 to determine the upper limit value of the transmit power according to the transmission path loss value and the signal-to-noise ratio tolerance of the second station, the following operations may also be performed:
  • the processor 61 calls the program code stored in the memory 64 to determine the upper limit value of the transmit power according to the transmission path loss value and the signal to noise ratio tolerance of the second station, which may be specifically:
  • the processor 61 calls the program code stored in the memory 64 to determine the upper limit value of the transmit power according to the transmission path loss value, the signal to noise ratio tolerance of the second station, and the channel matrix information. :
  • P 1 is an upper limit value of the transmission power
  • PL 1 , 2 is the transmission path loss value
  • ⁇ 2 is a channel estimation error
  • SNR 2 margin is a signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the Cold(A) operator represents any d column of the decimation matrix A
  • d is the number of data streams transmitted by the first station
  • a H represents the conjugate matrix of the matrix A
  • Tr(A) represents the trace of matrix A
  • a -1 represents the inverse matrix of matrix A
  • the site is a second service that has competed to the communication channel in a basic service set.
  • the site 70 in this embodiment may include at least a frame receiving module 71, a signal to noise ratio tolerance acquiring module 72, and a frame transmitting module 73. ,among them:
  • the frame receiving module 71 is configured to receive a request sending frame sent by a station in the basic service set where the second station is located.
  • the SNR tolerance obtaining module 72 is configured to send a frame according to the request to obtain a signal to noise ratio tolerance.
  • the signal-to-noise ratio tolerance acquisition module 72 may further include a received signal to noise ratio value acquisition unit 721 and a signal to noise ratio tolerance determination unit 722, as shown in FIG.
  • the received signal to noise ratio value obtaining unit 721 is configured to obtain a received signal to noise ratio value of the request sending frame.
  • the signal to noise ratio tolerance determining unit 722 is configured to determine the signal to noise ratio tolerance according to a difference between the received signal to noise ratio value and a preset minimum reference signal to noise ratio value.
  • a frame transmitting module 73 configured to broadcast a control frame carrying the signal to noise ratio tolerance, so that the first station in the second station signal coverage area determines the first station according to the signal to noise ratio tolerance An upper limit value of the transmit power, and causing the first station to transmit or not transmit a data packet according to the determined upper limit value of the transmit power.
  • the frame transmitting module 73 may broadcast a control frame carrying the SNR tolerance, so that the first station signal coverage area And determining, by the target station, an upper limit value of the transmit power of the first station according to the SNR tolerance, and causing the first station to send or not send a data packet according to the determined upper limit value of the transmit power.
  • the control frame includes a frame to be transmitted, and the frame sending module 73 may be specifically configured to:
  • FIG. 9 is a schematic structural diagram of another WLAN station according to an embodiment of the present invention.
  • the site is a second site in which a basic service set has contend for a communication channel.
  • the site 90 may include: at least one processor 91, such as a CPU, at least one communication bus 92, and a wireless signal transceiving device 93. And a memory 94.
  • the wireless signal transceiver 93 for receiving a request to send frame and transmitting a control frame; the communication bus 92 is used to implement connection communication between these components.
  • the memory 94 may be a high speed RAM memory, or may be a non-volatile memory such as at least one disk memory, a set of program codes stored in the memory 94, and a processor 91 for calling a program stored in the memory 94. Code to do the following:
  • the first station in the coverage area of the second station determines an upper limit value of the transmit power of the first station according to the signal to noise ratio tolerance, and causes the first station to transmit according to the determined The upper limit of power is sent or not sent.
  • the processor 91 calls the program code stored in the memory 94 to obtain a signal to noise ratio tolerance according to the request sending frame.
  • the signal to noise ratio tolerance is determined according to a difference between the received signal to noise ratio value and a preset minimum reference signal to noise ratio value.
  • control frame includes allowing a frame to be transmitted
  • the processor 91 calls the program code stored in the memory 94 to broadcast the control frame carrying the signal to noise ratio tolerance through the wireless signal transceiver 93.
  • the signal to noise ratio tolerance is added to the allowed transmission frame, and the allowed transmission frame is broadcast by the wireless signal transceiving device 93.
  • FIG. 10 is a schematic flowchart diagram of a communication method of a wireless local area network according to an embodiment of the present invention.
  • the communication method of the wireless local area network provided by the embodiment of the present invention may be implemented at, for example, an AP or STA site, where the site is a basic service set that has already contend for the communication channel.
  • the signal at the second site covers the first site within the area.
  • the number of antennas of the first station and the second station in the embodiment of the present invention is 1.
  • Embodiments of the invention are described from the perspective of a first site.
  • the communication process of the WLAN in this embodiment shown in FIG. 10 may include:
  • the first station receives a control frame broadcast by the second station, where the control frame carries a signal to noise ratio tolerance of the second station, and the second station is a station that has competed to the communication channel in a basic service set.
  • the first site may be an AP or an STA
  • the second site may also be an AP or an STA, which is not limited by the present invention.
  • the threshold of additional interference/noise that the second station can tolerate while maintaining the current rate and bit error rate is called the signal to noise ratio tolerance.
  • the second station is a station that receives data in the first communication link
  • the source station is a station that transmits data in the first communication link.
  • the control frame may include a CTS frame, and the second station may modify the CTS frame to add a signal to noise ratio tolerance to the CTS frame.
  • the control frame may also be other frames than the CTS frame, which is not limited in the present invention.
  • the first site is a site in the coverage area of the second site.
  • the embodiment of the present invention is only described for one site, and the other sites may perform the same operations, and details are not described herein again.
  • the first station acquires a transmission path loss value of the communication link of the second station to the first station according to the received power of the control frame and the transmit power of the second station transmitting the control frame.
  • the first station may use the difference between the transmit power of the control frame and the received power of the control frame as the transmission path loss value of the communication link of the second station to the first station.
  • the first station and the second station may pre-constrain the transmit power of the control frame.
  • the second station transmits the control frame at full power. Therefore, when the first station receives the control frame broadcast by the second station, the first station The pre-constrained full power may be used as the second station to transmit the transmit power of the control frame; or the control frame may carry the transmit power of the second station transmit control frame.
  • the first station determines an upper limit value of the transmit power according to the transmission path loss value and a signal to noise ratio tolerance of the second station.
  • the first station may determine an upper limit value of the transmit power of the first station according to the formula P 1 -PL 1,2 ⁇ SNR 2 margin ⁇ N 0 .
  • P 1 is the upper limit of the transmit power of the first station
  • PL 1 , 2 is the transmission path loss value
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the first station sends or does not send a data packet to the target station in the basic service set where the first station is located according to the determined upper limit value of the transmit power.
  • the first station may determine whether the upper limit of the transmit power is higher than or equal to a minimum value of the preset transmit power threshold, and if yes, according to the transmit power threshold And determining, by the upper limit value of the transmit power, a target transmit power, where the target transmit power is between the minimum value and the upper limit value, and the target transmit power is directed to a target site in a basic service set where the first site is located Transmitting the data packet, transmitting the data packet with the target transmission power, and causing interference to the second station within the SNR tolerance of the second station, and ensuring that the target station corresponding to the first station is normal. Receiving a data packet transmitted by the first station;
  • the data packet is not transmitted.
  • the first station when the first station determines the upper limit value of the transmit power in the communication process of the first communication link, the data packet is transmitted according to the determined upper limit value of the transmit power, In other optional embodiments, when the first station determines the upper limit of the transmit power, the first station may transmit or not transmit the data packet according to the determined upper limit value of the transmit power when the data packet needs to be transmitted.
  • the first station may obtain a transmission path loss value of the communication link of the second station to the first station, and determine an upper limit of the transmission power according to the transmission path loss value and the signal to noise ratio tolerance of the second station.
  • the value may be transmitted according to the upper limit value of the transmit power.
  • FIG. 11 is a schematic flowchart diagram of another communication method of a wireless local area network according to an embodiment of the present invention.
  • the communication method of the wireless local area network provided by the embodiment of the present invention may be implemented at, for example, an AP or STA site, where the site is a first site in a signal coverage area of a second site that has already contend for the communication channel in a basic service set.
  • the number of antennas of the first station is N, N>1, and the antenna data of the second station is M, M>1.
  • Embodiments of the invention are described from the perspective of a first site.
  • the communication process of the wireless local area network in this embodiment may be packaged. include:
  • S111 Receive a control frame broadcast by the second station, where the control frame carries a signal to noise ratio tolerance of the second station, where the second station is a station that has already contend for a communication channel in a basic service set.
  • the first site may be an AP or an STA
  • the second site may also be an AP or an STA, which is not limited by the present invention.
  • the control frame may include a CTS frame, and the second station may modify the CTS frame to add a signal to noise ratio tolerance to the CTS frame.
  • the control frame may also be other frames than the CTS frame, which is not limited in the present invention.
  • the first site is a site in the coverage area of the second site.
  • the embodiment of the present invention is only described for one site, and the other sites may perform the same operations, and details are not described herein again.
  • the first station may use the difference between the transmit power of the control frame and the received power of the control frame as the transmission path loss value of the communication link of the second station to the first station.
  • the first station and the second station may pre-constrain the transmit power of the control frame.
  • the second station transmits the control frame at full power. Therefore, when the first station receives the control frame broadcast by the second station, the first station The pre-constrained full power may be used as the second station to transmit the transmit power of the control frame; or the control frame may carry the transmit power of the second station transmit control frame.
  • S113 Estimate channel matrix information of the second station to the first station according to the control frame broadcast by the second station.
  • the first station estimates the channel matrix information of the second station to the first station according to the control frame broadcast by the second station, which is a technical method commonly used by those skilled in the art, and details are not described herein again.
  • the first site first performs the content of step S112, and then performs the content of step S113.
  • the first site may first perform the content of step S113, and then perform step S112.
  • the content of the step S112 and the content of the step S113 are performed by the first station at the same time, which is not limited by the present invention.
  • S114 Determine an upper limit value of the transmit power according to the transmission path loss value, the signal to noise ratio tolerance of the second station, and the channel matrix information.
  • the first site can be based on a formula
  • the upper limit value of the transmission power of the first station is determined.
  • P 1 is the upper limit of the transmit power of the first station
  • PL 1 , 2 is the transmission path loss value
  • ⁇ 2 is the channel estimation error
  • SNR 2 margin is the signal-to-noise ratio tolerance of the second station
  • N 0 is the noise power
  • the Cold(A) operator represents any d column of the decimation matrix A
  • d is the number of data streams transmitted by the first station
  • a H represents the conjugate matrix of the matrix A
  • Tr(A) represents the trace of matrix A
  • a -1 represents the inverse matrix of matrix A
  • S115 Send or not send a data packet to a target station in a basic service set where the first station is located according to the determined upper limit value of the transmit power.
  • the first station may determine whether the upper limit of the transmit power is higher than or equal to a minimum value of the preset transmit power threshold, and if yes, according to the transmit power threshold And determining, by the upper limit value of the transmit power, a target transmit power, where the target transmit power is between the minimum value and the upper limit value, and the target transmit power is directed to a target site in a basic service set where the first site is located Transmitting the data packet, transmitting the data packet with the target transmission power, and causing interference to the second station within the SNR tolerance of the second station, and ensuring that the target station corresponding to the first station is normal. Receiving a data packet transmitted by the first station;
  • the first station does not send the data packet.
  • the first station when the first station determines the upper limit value of the transmit power in the communication process of the first communication link, the data packet is transmitted according to the determined upper limit value of the transmit power, In other optional embodiments, when the first station determines the upper limit of the transmit power, the first station may also transmit or not transmit the data packet according to the upper limit value of the determined transmit power when the data packet needs to be transmitted.
  • the first station may obtain a transmission path loss value of the communication link of the second station to the first station, and acquire channel matrix information of the second station to the first station, and then according to the transmission
  • the path loss value, the signal-to-noise ratio tolerance of the second station, and the channel matrix information determine an upper limit value of the transmit power, and transmit the data packet according to the upper limit value of the transmit power, compared to the prior art, when the second station receives In the case of data, the first station cannot transmit data packets, which improves spectrum utilization.
  • FIG. 12 is a schematic flowchart diagram of still another method for communicating a wireless local area network according to an embodiment of the present invention.
  • the communication method of the wireless local area network provided by the embodiment of the present invention may be implemented at, for example, an AP or STA site, where the site is a first site in a signal coverage area of a second site that has already contend for the communication channel in a basic service set.
  • Embodiments of the invention are described from the perspective of a first site.
  • the communication process of the WLAN in this embodiment shown in FIG. 12 may include:
  • S121 Receive a control frame broadcast by the second station, where the control frame carries a signal to noise ratio tolerance of the second station, where the second station is a station that has already contend for a communication channel in a basic service set.
  • the first site may be an AP or an STA
  • the second site may also be an AP or an STA, which is not limited by the present invention.
  • the control frame may include a CTS frame, and the second station may modify the CTS frame to add a signal to noise ratio tolerance to the CTS frame.
  • the control frame may also be other frames than the CTS frame, which is not limited in the present invention.
  • the first site is a site in the coverage area of the second site.
  • the embodiment of the present invention is only described for one site, and the other sites may perform the same operations, and details are not described herein again.
  • the first station may use the difference between the transmit power of the control frame and the received power of the control frame as the transmission path loss value of the communication link of the second station to the first station.
  • the first station and the second station may pre-constrain the transmit power of the control frame.
  • the second station transmits the control frame at full power. Therefore, when the first station receives the control frame broadcast by the second station, the first station The pre-constrained full power may be used as the second station to transmit the transmit power of the control frame; or the control frame may carry the transmit power of the second station transmit control frame.
  • S123 Estimate channel matrix information of the second station to the first station according to the control frame broadcast by the second station.
  • the first station estimates the channel moment of the second station to the first station according to the control frame broadcast by the second station.
  • the array information is a technical method commonly used by those skilled in the art, and will not be described again here.
  • the first site first performs the content of step S122, and then performs the content of step S123.
  • the first site may first perform the content of step S123, and then perform step S122.
  • the content of the step S122 and the content of the step S123 are performed by the first station at the same time, which is not limited by the present invention.
  • S124 Determine an upper limit value of the transmit power according to the transmission path loss value, the signal to noise ratio tolerance of the second station, and the channel matrix information.
  • the first site can be based on a formula
  • the first station may establish parallel transmission with a transmit power less than or equal to the upper limit value Link, which improves spectrum utilization.
  • the first station determines the upper limit of the transmit power according to the process shown in FIG. 12, and in other optional embodiments, the first site may also be according to the process shown in FIG. Determine the upper limit of the transmit power.
  • the first station may determine whether the upper limit of the transmit power is higher than a minimum of the preset transmit power threshold of the first station, and if yes, indicate a preset transmit
  • the target transmission power exists in the power threshold, and the interference of the target transmission power transmission signal to the second station is within the signal to noise ratio tolerance range of the second station, and the first station performs step S126; otherwise, the first station is illustrated. If the interference of the second station is beyond the SNR of the second station, and the second station fails to receive the data sent by the source station, step S127 is performed.
  • the first station may determine a target transmit power between the minimum value and the upper limit value, so that The target transmission power is between the minimum value and the upper limit value and is not higher than the maximum value.
  • the first site may directly use the AP device as the target site; if the first site is an AP device, and the The basic service group formed by the AP device includes only one STA device, and the first site may directly use the STA device as the target site.
  • the first station may obtain the transmission path loss value of the communication link of the second station to the first station, and obtain the channel matrix information of the second station to the first station, and then according to the transmission path loss value,
  • the signal-to-noise ratio tolerance of the target station and the channel matrix information determine an upper limit value of the transmit power. If the determined upper limit value of the transmit power is higher than a minimum value of the preset transmit power threshold, according to the transmit power threshold and the determined The upper limit of the transmit power determines the target transmit power, and then the data packet is transmitted with the target transmit power, which improves the spectrum utilization.
  • FIG. 13 is a schematic flowchart diagram of a method for determining a target site according to an embodiment of the present invention.
  • the determining method of the target site provided by the embodiment of the present invention may be implemented, for example, on an AP or STA site, where the site is a first site in a signal coverage area of a second site that has already contend for the communication channel in a basic service set.
  • Embodiments of the invention are described from the perspective of a first site.
  • the determining process of the target site in this embodiment as shown in FIG. 13 may include:
  • the first station may transmit an interference value request frame to the station in the basic service set where the first station is located before performing the target transmit power to the target station in the basic service set where the first station is located, where the interference value request frame may be Send a frame for the request.
  • S132 Receive, by the station in the basic service set, a control frame that is requested by the frame according to the interference value, where the control frame carries an interference strength value of the corresponding site to be interfered with by the source station.
  • the basic service set of the first site includes three sites in addition to the first site, as shown in the figure. 15, wherein AP2 is the first site, STA1 is the second site, and STA2, STA3, and STA4 are three sites except the first site in the basic service set where the first site is located, and AP1 is the interference source site, and the interference is
  • the source station may be the source station of the first communication link, and the AP2 sends the interference value request frame to the STA2, the STA3, and the STA4, and the STA2 sends the interference strength value of the received AP1 to the AP2 through the control frame, and the STA3 and the STA4 perform the same operation.
  • the control frame may be a frame that is allowed to be transmitted.
  • AP1 sends a request to send frame to STA1, STA2, STA3, and STA4 respectively record the received power of the request transmission frame, and feed back the received power as the interference strength value to AP2.
  • the first station may filter the site with the interference intensity value reaching a preset threshold according to the control frame fed back from the site in the basic service set. Dropped to get a site that is less disturbed by the interferer source site.
  • the first station may determine, as the target site, a site corresponding to the minimum interference intensity value, that is, a site that minimizes interference from the interference source site, and further, when the interference occurs.
  • the target site suffers the least interference.
  • the first station may obtain, according to the control frame sent by the station where the interference strength value is less than a preset threshold, respectively, the station to the first station that the interference strength value is less than a preset threshold.
  • the transmission path loss value of the link is determined by determining the station corresponding to the minimum transmission path loss value as the target station.
  • the first station may obtain, according to the control frame sent by the station whose interference strength value is less than the preset threshold, the site with the interference strength value less than the preset threshold to the first site.
  • the transmission path loss value of the communication link is determined as the target station by the station corresponding to the minimum value of the sum of the transmission path loss value and the interference strength value.
  • the first station may obtain a station whose interference strength value is less than a preset threshold according to a control frame fed back by the site in the basic service set of the first station, and from the station whose interference intensity value is less than a preset threshold. Determining the target site ensures that the communication link established by the first site has a higher rate.
  • FIG. 14 is a schematic flowchart diagram of another communication method of a wireless local area network according to an embodiment of the present invention.
  • the communication method of the WLAN provided by the embodiment of the present invention may be implemented at, for example, an AP or STA site, where the site is a second site in which a basic service set has contend for a communication channel.
  • the communication process of the WLAN in this embodiment shown in FIG. 14 may include:
  • S141 Receive a request sending frame sent by a station in a basic service set where the second station is located.
  • all sites can be associated with one access site that connects to other wired sites (and possibly not) and controls and dominates the transmission of all data across the entire set of basic services.
  • the second station is a station that receives data in the first communication link
  • the source station is a station that transmits data in the first communication link.
  • the second station may acquire the signal to noise ratio tolerance of the second station according to the request sending frame.
  • the second station may obtain a received signal to noise ratio value of the request sending frame, and determine the signal to noise ratio tolerance according to a difference between the received signal to noise ratio value and a preset minimum reference signal to noise ratio value.
  • the second station may broadcast a control frame carrying the SNR tolerance, so that the first station in the second station signal coverage area is based on the signal noise.
  • the specific tolerance determines an upper limit value of the transmit power of the first station, and causes the first station to send or not transmit a data packet according to the determined upper limit value of the transmit power.
  • the control frame may include allowing a frame to be sent, that is, the second station may add the acquired signal to noise ratio tolerance to the allowed transmission frame, and broadcast the allowed transmission frame, so that the second station signal coverage
  • the first station in the area may also determine an upper limit value of the transmit power of the first station according to the allowed transmission frame, and further, the interference of the system may be reduced.
  • the second station when receiving the request to send the frame, may acquire the SNR tolerance and broadcast the control frame carrying the SNR tolerance, so that the target station in the signal coverage area receives the control frame.
  • the transmission path loss value of the communication link of the second station to the target station may be obtained, and the upper limit value of the transmission power is determined according to the transmission path loss value and the signal-to-noise ratio tolerance of the second station, and further,
  • the first station in the coverage of the second station signal may transmit the data packet according to the upper limit value of the transmit power.
  • the first station Compared with the prior art, when the second station receives the data, the first station must not transmit. In terms of data packets, spectrum utilization is improved.
  • FIG. 15 is a schematic structural diagram of a wireless local area network communication system according to an embodiment of the present invention.
  • the wireless local area network communication system provided by the embodiment of the present invention includes a first station and a second station, wherein the first station is a station in a signal coverage area of a second station that has competed to the communication channel in a basic service set.
  • the AP2 and the AP3 are the first site
  • the wireless local area network communication system provided by the embodiment of the present invention may include, but is not limited to, two first sites, where the first site and the second site are For the site, please refer to the corresponding embodiment of FIG. 2 to FIG. 10 , and details are not described herein again.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program execution includes some or all of the steps in the method described in connection with FIG. 10 to FIG. 13 in the embodiment of the present invention.
  • the embodiment of the present invention further provides a computer storage medium storing a program, which includes some or all of the steps in the method described in connection with FIG. 14 in the embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • first and second are defined
  • the features of "two” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • a "computer-readable medium” can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device.
  • computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
  • portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuit, ASIC with suitable combination logic gate, Programmable Gate Array (PGA), Field Programmable Gate Array (FPGA) Wait.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

本发明实施例公开了一种无线局域网的通信方法、站点和通信系统，其中一种方法包括：接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点；根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到第一站点的通信链路的传输路径损耗值；根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。采用本发明，提高了频谱利用率。

Description

一种无线局域网的通信方法、站点和通信系统 技术领域
本发明涉及无线通信技术领域，尤其涉及一种无线局域网的通信方法、站点和通信系统。
背景技术
现有WIFI的信道接入机制普遍为CSMA/CA(载波监听多路访问/冲突避免)，其基本思想是：发射端利用能量检测、载波检测或能量载波混合检测等方式判断当前信道的占用状态，以避免干扰。如果发射端所侦测到的接收信号强度高于CCA(clear channel assessment，空闲信道评估)阈值，则说明信道处于占用状态，发射端则继续等待；否则，发射端则尝试进行信道接入。
然而，基本的CSMA/CA只能保证在发射端通信范围内不会有其他站点同时抢占信道，但却无法避免在接收端附近的处于发射端通信范围之外的“隐藏终端”同时抢占信道对该接收端数据接收所带来的影响。于是，基于RTS(request to send，请求发送)/CTS(clear to send，允许发送)的干扰避免方式被提出来用于解决“隐藏终端”问题，即发射端检测信道空闲一段时间以后，在发送数据之前，先发送RTS帧给接收端，发射端在等待接收端回应CTS帧后才发送数据，发射端与接收端通过RTS/CTS握手程序，确保在传送数据时不会被碰撞。
请参阅图1，图1是RTS/CTS干扰避免实现实例，站点A为发射端，站点B为接收端，站点A、D、E处于站点B的信号覆盖区域内，当站点B向站点A反馈CTS帧时，站点D、E也会收到该CTS帧，那么，站点B在接收数据时，站点D以及站点E都不能发送数据。也就是说，即使是站点D或站点E发送的数据对站点B的干扰在站点B允许的范围内，站点D或站点E也不能发送数据，因此，降低了频谱利用率。
发明内容
本发明实施例提供了一种无线局域网的通信方法、站点和通信系统，可以 提高频谱利用率。
本发明实施例第一方面提供了一种无线局域网的站点，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点，所述第一站点包括：
帧接收模块，用于接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限；
传输路径损耗值获取模块，用于根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值；
发射功率确定模块，用于根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
信号处理模块，用于根据所述发射功率确定模块确定的发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
在第一方面的第一种可能实现方式中，所述发射功率确定模块包括：
第一发送功率确定单元，用于根据公式P1-PL1,2≤SNR2 margin×N0确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
结合第一方面或第一方面的第一种可能实现方式，在第二种可能的实现方式中，所述信号处理模块具体用于：
判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
若判断所述发射功率的上限值高于所述预设发射功率阈值中的最小值，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间；
以所述目标发射功率向所述目标站点发送所述数据包。
结合第一方面或第一方面的第一种至第二种中任一种可能实现方式，在第三种可能实现方式中，所述信号处理模块具体还用于：
判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
若判断所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
结合第一方面或第一方面的第一种至第三种中任一种可能实现方式，在第四种可能实现方式中，还包括：
帧发射模块，用于发射干扰值请求帧；
所述帧接收模块还用于：
接收所述第一站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
站点获取模块，用于根据所述第一站点所在基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点；
目标站点确定模块，用于在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
结合第一方面的第四种可能实现方式，在第五种可能实现方式中，所述目标站点确定模块包括：
第一确定单元，用于将最小的所述干扰强度值对应的站点确定为所述目标站点。
结合第一方面的第四种可能实现方式，在第六种可能实现方式中，所述目标站点确定模块包括：
传输路径损耗值获取单元，用于根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
第二确定单元，用于将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
结合第一方面的第四种可能实现方式，在第七种可能实现方式中，所述目标站点确定模块包括：
传输路径损耗值获取单元，用于根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
第三确定单元，用于将所述传输路径损耗值与所述干扰强度值之和的最小 值所对应的站点确定为所述目标站点。
结合第一方面的第四至第七种中任一种可能实现方式，在第八种可能的实现方式中，所述干扰源站点包括所述基本服务集中已经竞争到通信信道的源站点。
结合第一方面以及第一方面的第一至第八种中任一种可能实现方式，在第九种可能的实现方式中，还包括：
信道矩阵信息估算模块，用于根据所述第二站点广播的控制帧，估算所述第二站点到第一站点的信道矩阵信息；
所述发射功率确定模块包括：
第二发送功率确定单元，用于根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值。
结合第一方面的第九种可能实现方式，在第十种可能的实现方式中，所述第二发送功率确定单元具体用于：
根据公式
Figure PCTCN2014088720-appb-000001
确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
Figure PCTCN2014088720-appb-000002
是从
Figure PCTCN2014088720-appb-000003
的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为所述第一站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
Figure PCTCN2014088720-appb-000004
为所述第一站点根据所述估算出的所述第二站点到所述第一站点的信道矩阵并利用信道互易性所估算出的M×N维从所述第一站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和所述第一站点的天线数目。
本发明实施例第二方面提供了一种无线局域网的站点，所述站点为一个基本服务集中已经竞争到通信信道的第二站点，所述第二站点包括：
帧接收模块，用于接收所述第二站点所在基本服务集中的站点发送的请求发送帧；
信噪比容限获取模块，用于根据所述请求发送帧获取信噪比容限；
帧发射模块，用于广播携带所述信噪比容限的控制帧，以使所述第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
在第二方面的第一种可能的实现方式中，所述信噪比容限获取模块包括：
接收信噪比值获取单元，用于获取所述请求发送帧的接收信噪比值；
信噪比容限确定单元，用于根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
结合第二方面或第二方面的第一种可能实现方式，在第二种可能的实现方式中，所述控制帧包括允许发送帧；
所述帧发射模块具体用于：
将所述信噪比容限添加到所述允许发送帧中，并广播所述允许发送帧。
本发明实施例第三方面提供了一种无线局域网的通信方法，包括：
接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点；
根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到自身站点的通信链路的传输路径损耗值；
根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送或者不发送数据包。
在第三方面的第一种可能的实现方式中，所述根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值包括：
根据公式P1-PL1,2≤SNR2 margin×N0确定发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
结合第三方面或第三方面的第一种可能实现方式，在第二种可能的实现方式中，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送数据包括：
判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间；
以所述目标发射功率向自身站点所在基本服务集中的目标站点发射所述数据包。
结合第三方面或第三方面的第一种至第二种中任一种可能实现方式，在第三种可能的实现方式中，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点不发送数据包括：
判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
若所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在所述已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
结合第三方面或第三方面的第一种至第三种中任一种可能实现方式，在第四种可能的实现方式中，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送数据包之前，还包括：
发射干扰值请求帧；
接收自身站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
根据所述基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点；
在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
结合第三方面的第四种可能实现方式，在第五种可能的实现方式中，所述在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
将最小的所述干扰强度值对应的站点确定为所述目标站点。
结合第三方面的第四种可能实现方式，在第六种可能的实现方式中，在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到自身站点的通信链路的传输路径损耗值；
将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
结合第三方面的第四种可能实现方式，在第七种可能的实现方式中，所述 在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
结合第三方面的第四种至第七种中任一种可能实现方式，在第八种可能的实现方式中，所述干扰源站点包括所述基本服务集中已经竞争到通信信道的源站点。
结合第三方面或第三方面的第一种至第八种中任一种可能实现方式，在第九种可能的实现方式中，所述根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值之前，还包括：
根据所述第二站点广播的控制帧，估算所述第二站点到自身站点的信道矩阵信息；
根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值包括：
根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值。
结合第三方面的第九种可能实现方式，在第十种可能的实现方式中，所述根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值包括：
根据公式
Figure PCTCN2014088720-appb-000005
确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
Figure PCTCN2014088720-appb-000006
是从
Figure PCTCN2014088720-appb-000007
的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为自身站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
Figure PCTCN2014088720-appb-000008
为自身站点根据所述估算出的所述第二站点到自身站点的信道矩阵并利用信道互易性所估算出的M×N维从自身站点到所述第二站点的信道矩阵 信息，其中，M和N分别表示所述第二站点和自身站点的天线数目。
本发明实施例第四方面提供一种无线局域网的通信方法，包括：
接收自身站点所在基本服务集中的站点发送的请求发送帧；
根据所述请求发送帧获取信噪比容限；
广播携带所述信噪比容限的控制帧，以使自身站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
在第四方面的第一种可能的实现方式中，所述根据所述请求发送帧获取信噪比容限包括：
获取所述请求发送帧的接收信噪比值；
根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
结合第四方面或第四方面的第一种可能实现方式，在第二种可能的实现方式中，所述控制帧包括允许发送帧；
广播携带所述信噪比容限的控制帧包括：
将所述信噪比容限添加到所述允许发送帧中，并广播所述允许发送帧。
本发明实施例第五方面提供一种计算机存储介质，所述计算机存储介质存储有程序，该程序执行时包括第三方面提供的无线局域网的通信方法的部分或全部步骤。
本发明实施例第六方面提供一种计算机存储介质，所述计算机存储介质存储有程序，该程序执行时包括第四方面提供的无线局域网的通信方法的部分或全部步骤。
本发明实施例第七方面提供一种无线局域网的站点，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点，所述第一站点包括无线信号收发装置、存储器以及处理器，其中，所述存储器中存储一组程序代码，且所述处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
通过所述无线信号收发装置接收所述第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限；
根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值；
根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
本发明实施例第八方面提供一种无线局域网的站点，所述站点为一个基本服务集中已经竞争到通信信道的第二站点，所述第二站点包括无线信号收发装置、存储器以及处理器，其中，所述存储器中存储一组程序代码，且所述处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
通过所述无线信号收发装置接收第二站点所在基本服务集中的站点发送的请求发送帧；
根据所述请求发送帧获取信噪比容限；
通过所述无线信号收发装置广播携带所述信噪比容限的控制帧，以使第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
本发明实施例第九方面提供一种无线局域网通信系统，所述系统包括至少第一站点和第二站点，其中：
第一站点如第一方面，或者第一方面的第一种可能的实现方式，或者第一方面的第二种可能的实现方式，或者第一方面的第三种可能的实现方式，或者第一方面的第四种可能的实现方式，或者第一方面的第五种可能的实现方式，或者第一方面的第六种可能的实现方式，或者第一方面的第七种可能实现方式，或者第一方面的第八种可能实现方式，或者第一方面的第九种可能实现方式，或者第一方面的第十种可能的实现方式中的站点；
第二站点为第二方面，或者第二方面的第一种可能的实现方式，或者第二方面的第二种可能的实现方式中的站点。
实施本发明实施例，第二站点在接收到请求发送帧时，可以获取信噪比容限，并广播携带该信噪比容限的控制帧，当第一站点接收到该控制帧时，第一 站点可以获取第二站点到第一站点的通信链路的传输路径损耗值，并根据该传输路径损耗值和第二站点的信噪比容限确定发射功率的上限值，并根据确定的发射功率的上限值，可以针对在第一站点所在的基本服务集中的目标站点发送数据包，相比现有技术，当第二站点接收数据时，第一站点一定不能发射数据包而言，提高了频谱利用率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术中RTS/CTS干扰避免实例的结构示意图；
图2是本发明实施例提供的一种无线局域网的站点的结构示意图；
图3是本发明实施例提供的一种发射功率确定模块的结构示意图；
图4是本发明实施例提供的另一种无线局域网的站点的结构示意图；
图5是本发明实施例提供的一种目标站点确定模块的结构示意图；
图6是本发明实施例提供的又一种无线局域网的站点的结构示意图；
图7是本发明实施例提供的一种无线局域网的站点的结构示意图；
图8是本发明实施例提供的一种信噪比容限获取模块的结构示意图；
图9是本发明实施例提供的另一种无线局域网的站点的结构示意图；
图10是本发明实施例提供的一种无线局域网的通信方法的流程示意图；
图11是本发明实施例提供的另一种无线局域网的通信方法的流程示意图；
图12是本发明实施例提供的又一种无线局域网的通信方法的流程示意图；
图13是本发明实施例提供的一种目标站点的确定方法的流程示意图；
图14是本发明实施例提供的又一种无线局域网的通信方法的流程示意图；
图15是本发明实施例提供的一种无线局域网通信系统的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
若干个站点欲使用信道，第一个退避结束抢占到信道的源站点发送RTS帧，若该RTS帧中接收地址所对应的目的站点检测到该RTS帧并向其反馈了CTS帧，且该源站点成功接收到了所述CTS帧，则该站点对获得信道使用权，将该站点对建立的通信链路称为第一通信链路(即主通信链路)，在第一通信链路通信过程中，所述目的站点的信号覆盖区域内的站点与其他站点建立的通信链路称为第二通信链路(即次通信链路)。本发明可以适用于上下行通信链路，本发明也可以扩展到多个第二通信链路，本发明不做限定，为了便于理解，以下实施例以一个第二通信链路为例进行描述。
请参阅图2，图2是本发明实施例提供的一种无线局域网的站点的结构示意图。本发明实施例提供的站点可以包括AP(wireless access point，无线访问接入点)或STA(station，站点)等通信设备。所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点。如图2所示本实施例中的站点20至少可以包括帧接收模块21、传输路径损耗值获取模块22、发射功率确定模块23以及信号处理模块24，其中：
帧接收模块21，用于接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限。
传输路径损耗值获取模块22，用于根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值。
具体地，传输路径损耗值获取模块22，可以将控制帧的发射功率与控制帧的接收功率之间的差值作为第二站点到第一站点的通信链路的传输路径损耗值。
发射功率确定模块23，用于根据所述传输路径损耗值和所述第二站点的 信噪比容限确定发射功率的上限值。
具体地，发射功率确定模块23如图3所示进一步可以包括第一发送功率确定单元231，用于根据公式P1-PL1,2≤SNR2 margin×N0确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
信号处理模块24，用于根据所述发射功率确定模块23确定的发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
具体地，所述信号处理模块具体可以用于：
判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
若判断所述发射功率的上限值高于所述预设发射功率阈值中的最小值，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间且不高于预设发射功率阈值中的最大值；
以所述目标发射功率向所述目标站点发送所述数据包。
所述信号处理模块24具体还可以用于：
判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
若判断所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在所述已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
具体实现中，当发射功率确定模块23获取到发射功率的上限值时，信号处理模块24可以判断所述发射功率的上限值是否高于第一站点的预设发射功率阈值中的最小值，若是，说明预设发射功率阈值中存在目标发射功率，且以该目标发射功率发射数据包对第二站点的干扰在第二站点的信噪比容限范围之内，则确定目标发射功率，并以所述目标发射功率向所述目标站点发送所述数据包；否则，说明以预设发射功率阈值中的任意发射功率发射数据包对第二站点的干扰都超出第二站点的信噪比容限，第二站点则不能正常接收源站点发送的数据，则在所述第二站点占用所述通信信道时不发送所述数据包。
再进一步地，所述站点20如图4所示进一步还可以包括帧发射模块25、站点选择模块26以及目标站点确定模块27，其中：
帧发射模块25，用于发射干扰值请求帧；
所述帧接收模块26还用于：
接收所述第一站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
优选的，所述干扰请求帧可以包括请求发送帧，当所述第一站点需要发送数据时，帧发射模块25可以发送请求发送帧，帧接收模块21接收所述第一所在基本服务集中的站点根据所述请求发送帧反馈的允许发送帧；
所述干扰值请求帧和所述请求发送帧也可以是相互独立的帧。
站点选择模块26，用于根据所述基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点。
目标站点确定模块27，用于在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
作为一种可选的实施方式，所述目标站点确定模块如图5所示具体可以包括第一确定单元271，用于将最小的所述干扰强度值对应的站点确定为所述目标站点。
作为另一种可选的实施方式，所述目标站点确定模块如图5所示具体可以包括传输路径损耗值获取单元272以及第二确定单元273，其中：
传输路径损耗值获取单元272，用于根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
第二确定单元273，用于将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
作为又一种可选的实施方式，所述目标站点确定模块如图5所述具体可以包括传输路径损耗值获取单元272以及第二确定单元274，其中：
传输路径损耗值获取单元272，用于根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
第三确定单元274，用于将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
进一步地，所述站点20如图4所示进一步还可以包括信道矩阵信息估算模块28，用于根据所述第二站点广播的控制帧，估算所述第二站点到第一站点的信道矩阵信息；
所述发射功率确定模块23如图3所示进一步还可以包括：
第二发送功率确定单元232，用于根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值。
具体地，所述第二发送功率确定单元232可以根据公式
Figure PCTCN2014088720-appb-000009
确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
Figure PCTCN2014088720-appb-000010
是从
Figure PCTCN2014088720-appb-000011
的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为所述第一站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
Figure PCTCN2014088720-appb-000012
为所述第一站点根据所述估算出的所述第二站点到所述第一站点的信道矩阵并利用信道互易性所估算出的M×N维从所述第一站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和所述第一站点的天线数目。
可理解的是，本实施例的站点20的各功能模块的功能可根据下述方法实施例中的方法具体实现，可以具体对应参考图10至图13方法实施例的相关描述，此处不再赘述。
请参阅图6，图6是本发明实施例提供的又一种站点的结构示意图。如图6所示，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点，该站点60可以包括：至少一个处理器61，例如CPU，至少一个通信总线62，无线信号收发装置63以及存储器64。其中，无线信号收发装置63，用于接收第二站点广播的控制帧以及第一站点所在基本服务集中的站点根据干扰值请求帧反馈的控制帧；通信总线62用于实现这些组件之 间的连接通信。存储器64可以是高速RAM存储器，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器，存储器64中存储一组程序代码，且处理器61用于调用存储器64中存储的程序代码，用于执行以下操作：
通过所述无线信号收发装置63接收所述第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限；
根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到第一站点的通信链路的传输路径损耗值；
根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
其中，处理器61调用存储器64中存储的程序代码根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值具体可以为：
根据公式P1-PL1,2≤SNR2 margin×N0确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
进一步地，处理器61调用存储器64中存储的程序代码根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送数据具体可以为：
判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间；
通过无线发射模块63以所述目标发射功率向所述第一站点所在基本服务集中的目标站点发射所述数据包。
再进一步地，处理器61调用存储器64中存储的程序代码根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送数据具体可以为：
判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
若判断所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在所述已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
其中，处理器61调用存储器64中存储的程序代码根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送数据包之前，还执行以下操作：
通过无线发射模块63发射干扰值请求帧；
通过无线发射模块63接收所述第一站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
根据所述基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点；
在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
作为一种可选的实施方式，处理器61调用存储器64中存储的程序代码在所述干扰强度值小于预设阈值的站点中确定出所述目标站点具体可以为：
将最小的所述干扰强度值对应的站点确定为所述目标站点。
作为另一种可选的实施方式，处理器61调用存储器64中存储的程序代码在所述干扰强度值小于预设阈值的站点中确定出所述目标站点具体可以为：
根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
作为又一种可选的实施方式，处理器61调用存储器64中存储的程序代码在所述干扰强度值小于预设阈值的站点中确定出所述目标站点具体可以为：
根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
可选地，所述干扰源站点包括所述基本服务集中已经竞争到通信信道的源站点。
进一步地，处理器61调用存储器64中存储的程序代码根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值之前，还可以执行以下操作：
根据所述第二站点广播的控制帧，估算所述第二站点到所述第一站点的信道矩阵信息；
处理器61调用存储器64中存储的程序代码根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值具体可以为：
根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值。
其中，处理器61调用存储器64中存储的程序代码根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值具体可以为：
根据公式
Figure PCTCN2014088720-appb-000013
确定所述发射功率的上限值；
其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
Figure PCTCN2014088720-appb-000014
是从
Figure PCTCN2014088720-appb-000015
的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为第一站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
Figure PCTCN2014088720-appb-000016
为所述第一站点根据所述估算出的所述第二站点到所述第一站点的信道矩阵并利用信道互易性所估算出的M×N维从所述第一站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和第所述第一站点的天线数目。
可理解的是，本实施例的站点60的各功能模块的功能可根据下述方法实施例中的方法具体实现，可以具体对应参考图10至图13方法实施例的相关描述，此处不再赘述。 述站点为一个基本服务集中已经竞争到通信信道的第二站点，如图7所示本实施例中的站点70至少可以包括帧接收模块71、信噪比容限获取模块72以及帧发射模块73，其中：
帧接收模块71，用于接收所述第二站点所在基本服务集中的站点发送的请求发送帧。
信噪比容限获取模块72，用于根据所述请求发送帧获取信噪比容限。
具体地，信噪比容限获取模块72如图8所示进一步可以包括接收信噪比值获取单元721以及信噪比容限确定单元722，其中：
接收信噪比值获取单元721，用于获取所述请求发送帧的接收信噪比值；
信噪比容限确定单元722，用于根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
帧发射模块73，用于广播携带所述信噪比容限的控制帧，以使所述第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
具体地，当信噪比容限获取模块72获取到信噪比容限时，帧发射模块73可以广播携带所述信噪比容限的控制帧，以使所述第一站点信号覆盖区域内的目标站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
其中，所述控制帧包括允许发送帧，所述帧发射模块73具体可以用于：
将所述信噪比容限添加到所述允许发送帧中，并广播所述允许发送帧。
可理解的是，本实施例的站点70的各功能模块的功能可根据下述方法实施例中的方法具体实现，可以具体对应参考图14方法实施例的相关描述，此处不再赘述。
请参阅图90，图9是本发明实施例提供的另一种无线局域网的站点的结构示意图。所述站点为一个基本服务集中已经竞争到通信信道的第二站点，如图9所示，该站点90可以包括：至少一个处理器91，例如CPU，至少一个通信总线92，无线信号收发装置93以及存储器94。其中，无线信号收发装置 93，用于接收请求发送帧以及发射控制帧；通信总线92用于实现这些组件之间的连接通信。存储器94可以是高速RAM存储器，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器，存储器94中存储一组程序代码，且处理器91用于调用存储器94中存储的程序代码，用于执行以下操作：
通过无线信号收发装置93接收所述第二站点所在基本服务集中的站点发送的请求发送帧；
根据所述请求发送帧获取信噪比容限；
通过无线信号收发装置93广播携带所述信噪比容限的控制帧，
以使所述第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
其中，处理器91调用存储器94中存储的程序代码根据所述请求发送帧获取信噪比容限具体可以为：
获取所述请求发送帧的接收信噪比值；
根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
优选地，所述控制帧包括允许发送帧；
处理器91调用存储器94中存储的程序代码通过无线信号收发装置93广播携带所述信噪比容限的控制帧具体可以为：
将所述信噪比容限添加到所述允许发送帧中，并通过无线信号收发装置93广播所述允许发送帧。
可理解的是，本实施例的站点90的各功能模块的功能可根据下述方法实施例中的方法具体实现，可以具体对应参考图14方法实施例的相关描述，此处不再赘述。
请参阅图10，图10是本发明实施例提供的一种无线局域网的通信方法的流程示意图。本发明实施例提供的无线局域网的通信方法可以实现在例如AP或STA站点上，其中，所述站点为一个基本服务集中已经竞争到通信信道的 第二站点的信号覆盖区域内的第一站点。本发明实施例中的第一站点和第二站点的天线数目为1。本发明实施例是从第一站点角度进行描述的。如图10所示本实施例中的无线局域网的通信流程可以包括：
S101，第一站点接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点。
第一站点可以为AP或STA，第二站点也可以为AP或STA，本发明不做限定。第二站点在保持当前速率和误码率的前提下，还能容忍的附加干扰/噪声的阈值称为信噪比容限。
其第二站点为第一通信链路中接收数据的站点，源站点为该第一通信链路中发送数据的站点。
其控制帧可以包括CTS帧，第二站点可以对CTS帧进行修改将信噪比容限添加到该CTS帧中；该控制帧也可以是除CTS帧外的其他帧，本发明不作限定。
第一站点为第二站点信号覆盖区域内的任一站点，本发明实施例只是针对其中一个站点进行描述，其他站点也可以执行同样的操作，在此不再赘述。
S102，第一站点根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值。
具体地，第一站点可以将控制帧的发射功率与控制帧的接收功率之间的差值作为第二站点到第一站点的通信链路的传输路径损耗值。
其中，第一站点与第二站点可以预先约束控制帧的发射功率，例如，第二站点以全功率发射控制帧，因此，当第一站点接收到第二站点广播的控制帧时，第一站点可以将预先约束的全功率作为第二站点发射该控制帧的发射功率；或者，控制帧可以携带第二站点发射控制帧的发射功率。
S103，第一站点根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值。
具体地，第一站点可以根据公式P1-PL1,2≤SNR2 margin×N0确定所述第一站点的发射功率的上限值。
其中，P1为第一站点的发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为第二站点的信噪比容限，N0为噪声功率。
S104，第一站点根据确定的所述发射功率的上限值，针对在第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
当第一站点确定发射功率的上限值时，第一站点可以判断所述发射功率的上限值是否高于或等于预设发射功率阈值中的最小值，若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间，以所述目标发射功率向第一站点所在基本服务集中的目标站点发射所述数据包，以该目标发射功率发射数据包，对第二站点造成的干扰既在其第二站点的信噪比容限范围之内，也确保了第一站点对应的目标站点可以正常接收第一站点发射的数据包；
若发射功率的上限值小于预设发射功率阈值中的最小值，则不发送所述数据包。
需要指出的是，本发明实施例中，在第一通信链路通信过程中，当第一站点确定了发射功率的上限值时，则根据确定的发射功率的上限值发射数据包，在其他可选实施例中，当第一站点确定了发射功率的上限值时，第一站点可以在需要发射数据包时，才根据确定的发射功率的上限值发射或者不发送数据包。
实施本发明实施例，第一站点可以获取第二站点到第一站点的通信链路的传输路径损耗值，根据该传输路径损耗值和第二站点的信噪比容限确定发射功率的上限值，并可以根据该发射功率的上限值发射数据包，相比现有技术，当第二站点接收数据时，第一站点一定不能发射数据包而言，提高了频谱利用率。
请参阅图11，图11是本发明实施例提供的另一种无线局域网的通信方法的流程示意图。本发明实施例提供的无线局域网的通信方法可以实现在例如AP或STA站点上，其中，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点。本发明实施例中的第一站点的天线数目为N，N>1，第二站点的天线数据为M，M>1。本发明实施例是从第一站点角度进行描述的。如图11所示本实施例中的无线局域网的通信流程可以包 括：
S111，接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点。
第一站点可以为AP或STA，第二站点也可以为AP或STA，本发明不做限定。
其控制帧可以包括CTS帧，第二站点可以对CTS帧进行修改将信噪比容限添加到该CTS帧中；该控制帧也可以是除CTS帧外的其他帧，本发明不作限定。
第一站点为第二站点信号覆盖区域内的任一站点，本发明实施例只是针对其中一个站点进行描述，其他站点也可以执行同样的操作，在此不再赘述。
S112，根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到第一站点的通信链路的传输路径损耗值。
具体地，第一站点可以将控制帧的发射功率与控制帧的接收功率之间的差值作为第二站点到第一站点的通信链路的传输路径损耗值。
其中，第一站点与第二站点可以预先约束控制帧的发射功率，例如，第二站点以全功率发射控制帧，因此，当第一站点接收到第二站点广播的控制帧时，第一站点可以将预先约束的全功率作为第二站点发射该控制帧的发射功率；或者，控制帧可以携带第二站点发射控制帧的发射功率。
S113，根据所述第二站点广播的控制帧，估算所述第二站点到第一站点的信道矩阵信息。
第一站点根据第二站点广播的控制帧，估算第二站点到第一站点的信道矩阵信息是本领域技术人员常用的技术方法，这里不再赘述。
需要指出的是，本发明实施中，第一站点先执行步骤S112的内容，再执行步骤S113的内容，在其他可选实施例中，第一站点可以先执行步骤S113的内容，再执行步骤S112的内容；或者，第一站点同时执行步骤S112的内容和步骤S113的内容，本发明不做限定。
S114，根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定发射功率的上限值。
具体地，第一站点可以根据公式
Figure PCTCN2014088720-appb-000017
确定所第一站点的发射功率的上限值。
其中，P1为第一站点的发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为第二站点的信噪比容限，N0为噪声功率；
Figure PCTCN2014088720-appb-000018
是从
Figure PCTCN2014088720-appb-000019
的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为第一站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
Figure PCTCN2014088720-appb-000020
为所述第一站点根据所述估算出的所述第二站点到所述第一站点的信道矩阵并利用信道互易性所估算出的M×N维从所述第一站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和第所述第一站点的天线数目。
S115，根据确定的所述发射功率的上限值，针对在第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
当第一站点确定发射功率的上限值时，第一站点可以判断所述发射功率的上限值是否高于或者等于预设发射功率阈值中的最小值，若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间，以所述目标发射功率向第一站点所在基本服务集中的目标站点发射所述数据包，以该目标发射功率发射数据包，对第二站点造成的干扰既在其第二站点的信噪比容限范围之内，也确保了第一站点对应的目标站点可以正常接收第一站点发射的数据包；
若发射功率的上限值小于预设发射功率阈值中的最小值，第一站点则不发送数据包。
需要指出的是，本发明实施例中，在第一通信链路通信过程中，当第一站点确定了发射功率的上限值时，则根据确定的发射功率的上限值发射数据包，在其他可选实施例中，当第一站点确定了发射功率的上限值时，第一站点也可以在需要发射数据包时，才根据确定的发射功率的上限值发射或者不发送数据包。
实施本发明实施例，第一站点可以获取第二站点到第一站点的通信链路的传输路径损耗值，并获取第二站点到第一站点的信道矩阵信息，再根据该传输 路径损耗值、第二站点的信噪比容限以及该信道矩阵信息确定发射功率的上限值，并根据该发射功率的上限值发射数据包，相比现有技术，当第二站点接收数据时，第一站点不能发射数据包而言，提高了频谱利用率。
请参阅图12，图12是本发明实施例提供的又一种无线局域网的通信方法的流程示意图。本发明实施例提供的无线局域网的通信方法可以实现在例如AP或STA站点上，其中，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点。本发明实施例是从第一站点角度进行描述的。如图12所示本实施例中的无线局域网的通信流程可以包括：
S121，接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点。
第一站点可以为AP或STA，第二站点也可以为AP或STA，本发明不做限定。
其控制帧可以包括CTS帧，第二站点可以对CTS帧进行修改将信噪比容限添加到该CTS帧中；该控制帧也可以是除CTS帧外的其他帧，本发明不作限定。
第一站点为第二站点信号覆盖区域内的任一站点，本发明实施例只是针对其中一个站点进行描述，其他站点也可以执行同样的操作，在此不再赘述。
S122，根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到第一站点的通信链路的传输路径损耗值。
具体地，第一站点可以将控制帧的发射功率与控制帧的接收功率之间的差值作为第二站点到第一站点的通信链路的传输路径损耗值。
其中，第一站点与第二站点可以预先约束控制帧的发射功率，例如，第二站点以全功率发射控制帧，因此，当第一站点接收到第二站点广播的控制帧时，第一站点可以将预先约束的全功率作为第二站点发射该控制帧的发射功率；或者，控制帧可以携带第二站点发射控制帧的发射功率。
S123，根据所述第二站点广播的控制帧，估算所述第二站点到第一站点的信道矩阵信息。
第一站点根据第二站点广播的控制帧，估算第二站点到第一站点的信道矩 阵信息是本领域技术人员常用的技术方法，这里不再赘述。
需要指出的是，本发明实施中，第一站点先执行步骤S122的内容，再执行步骤S123的内容，在其他可选实施例中，第一站点可以先执行步骤S123的内容，再执行步骤S122的内容；或者，第一站点同时执行步骤S122的内容和步骤S123的内容，本发明不做限定。
S124，根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定发射功率的上限值。
具体地，第一站点可以根据公式
Figure PCTCN2014088720-appb-000021
确定所第一站点的发射功率的上限值，当第一站点需要在第一通信链路通信过程中发射数据包时，第一站点可以以小于或等于该上限值的发射功率建立并行传输链路，提高了频谱利用率。
需要指出的是，本发明实施例中，第一站点是根据图12所示的流程确定发射功率的上限值，在其他可选实施例中，第一站点也可以根据图11所示的流程确定发射功率的上限值。
S125，判断确定的所述发射功率的上限值是否达到预设发射功率阈值中的最小值。
当第一站点获取到发射功率的上限值时，第一站点可以判断所述发射功率的上限值是否高于第一站点的预设发射功率阈值中的最小值，若是，说明预设发射功率阈值中存在目标发射功率，且以该目标发射功率发射信号对第二站点的干扰在第二站点的信噪比容限范围之内，第一站点则执行步骤S126；否则，说明第一站点以预设发射功率阈值中的任意发射功率发射信号对第二站点的干扰都超出第二站点的信噪比容限，第二站点则不能正常接收源站点发送的数据，则执行步骤S127。
S126，若否，则在所述第二站点占用所述通信信道时不发送数据包。
S127，若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间。
如果所述发射功率的上限值高于所述第一站点的预设发射功率阈值中的最小值，第一站点可以在所述最小值与所述上限值之间确定目标发射功率，使 得目标发射功率在所述最小值与所述上限值之间且不高于所述最大值。
S128，以所述目标发射功率向第一站点所在基本服务集中的目标站点发射数据包。
如果自身站点所在基本服务集中只存在一个AP设备，且该第一站点为STA设备，则第一站点可以直接将该AP设备作为所述目标站点；如果，该第一站点为AP设备，且该AP设备组成的基本服务集中只包括一个STA设备，则第一站点也可以直接将该STA设备作为所述目标站点。
如果，该基本服务集中存在多个AP设备或者多个STA，则第一站点如何在第一站点所在基本服务集中确定出目标站点的方法请参照图13所示的流程示意图，在此不再赘述。
实施本发明实施例，第一站点可以获取第二站点到第一站点的通信链路的传输路径损耗值，并获取第二站点到第一站点的信道矩阵信息，再根据该传输路径损耗值、目标站点的信噪比容限以及该信道矩阵信息确定发射功率的上限值，如果确定的发射功率的上限值高于预设发射功率阈值中的最小值，则根据发射功率阈值和确定的发射功率的上限值确定目标发射功率，再以该目标发射功率发射数据包，提高了频谱利用率。
请参阅图13，图13是本发明实施例提供的一种目标站点的确定方法的流程示意图。本发明实施例提供的目标站点的确定方法可以实现在例如AP或STA站点上，其中，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点。本发明实施例是从第一站点角度进行描述的。如图13所示本实施例中的目标站点的确定流程可以包括：
S131，向第一站点所在基本服务集中的站点发射干扰值请求帧。
第一站点可以在执行以目标发射功率向第一站点所在基本服务集中的目标站点发射信号之前，向第一站点所在基本服务集中的站点发射干扰值请求帧，其中，所述干扰值请求帧可以为请求发送帧。
S132，接收所述基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值。
假设，第一站点所在基本服务集中除了第一站点还包括三个站点，如图 15所示，其中，AP2为第一站点，STA1为第二站点，STA2、STA3和STA4是第一站点所在基本服务集中除了第一站点之外的三个站点，AP1为干扰源站点，该干扰源站点可以为第一通信链路的源站点，AP2向STA2、STA3和STA4发送干扰值请求帧，STA2则将收到AP1的干扰强度值通过控制帧反馈给AP2，STA3和STA4执行同样的操作，其中，该控制帧可以为允许发送帧。
当AP1向STA1发送请求发送帧时，STA2、STA3和STA4分别可以记录接收到所述请求发送帧的接收功率，将该接收功率作为干扰强度值反馈给AP2。
S133，根据所述基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点。
所述干扰强度值越小说明对应的站点受到干扰源站点的干扰越小，因此，第一站点可以根据所述基本服务集中的站点反馈的控制帧，将干扰强度值达到预设阈值的站点过滤掉，从而获取受到干扰源站点较小干扰的站点。
S134，在所述干扰强度值小于预设阈值的站点中确定出目标站点。
作为一种可选的实施方式，第一站点可以将最小的所述干扰强度值对应的站点确定为所述目标站点，也就是将受到干扰源站点干扰最小的站点作为目标站点，进而，当干扰源站点向第二站点发送数据时，目标站点受到的干扰最小。
作为另一种可选的实施方式，第一站点可以根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到第一站点的通信链路的传输路径损耗值，再将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
作为又一种可选的实施方式，第一站点可以根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值，再将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
实施本发明实施例，第一站点可以根据第一站点所在基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点，并从所述干扰强度值小于预设阈值的站点中确定出目标站点，确保了第一站点建立的通信链路具有较高的速率。
请参阅图14，图14是本发明实施例提供的又一种无线局域网的通信方法的流程示意图。本发明实施例提供的无线局域网的通信方法可以实现在例如AP或STA站点上，其中，所述站点为一个基本服务集中已经竞争到通信信道的第二站点。如图14所示本实施例中的无线局域网的通信流程可以包括：
S141，接收第二站点所在基本服务集中的站点发送的请求发送帧。
在一个基本服务集中，所有站点可以关联到一个访问站点上，该访问站点连接其他有线站点(也可能不连接)，并且控制和主导整个基本服务集中的全部数据的传输过程。
其第二站点为第一通信链路中接收数据的站点，源站点为该第一通信链路中发送数据的站点。
S142，根据所述请求发送帧获取信噪比容限。
具体地，当第二站点接收到请求发送帧时，第二站点可以根据所述请求发送帧获取第二站点的信噪比容限。
其中，第二站点可以获取该请求发送帧的接收信噪比值，再根据接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
S143，广播携带所述信噪比容限的控制帧，以使所述第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
具体地，当第二站点获取到信噪比容限时，第二站点可以广播携带所述信噪比容限的控制帧，以使第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
其中，所述控制帧可以包括允许发送帧，也就是说，第二站点可以将所获取的信噪比容限添加到允许发送帧中，并广播该允许发送帧，使得，第二站点信号覆盖区域内的第一站点也可以根据所述允许发送帧确定第一站点的发射功率的上限值，进而，可以降低系统的干扰。
本发明实施例中，第二站点在接收到请求发送帧时，可以获取信噪比容限，并广播携带该信噪比容限的控制帧，使得当信号覆盖范围的目标站点接收到该 控制帧时可以获取第二站点到目标站点的通信链路的传输路径损耗值，并根据该传输路径损耗值和第二站点的信噪比容限确定发射功率的上限值，进而，当第二站点接收数据时，第二站点信号覆盖范围内的第一站点可以根据该发射功率的上限值发射数据包，相比现有技术，当第二站点接收数据时，第一站点一定不能发射数据包而言，提高了频谱利用率。
请参阅图15，图15是本发明实施例提供的一种无线局域网通信系统的结构示意图。本发明实施例提供的无线局域网通信系统包括第一站点和第二站点，其中，所述第一站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的站点。如图15所示，AP2和AP3为第一站点，可理解的是，本发明实施例提供的无线局域网通信系统可以包括但不仅限于两个第一站点，其中，所述第一站点以及第二站点请参阅图2至图10对应的实施例，在此不再赘述。
本发明实施例还提出了一种计算机存储介质，所述计算机存储介质存储有程序，所述程序执行时包括本发明实施例结合图10～图13所描述的方法中的部分或全部的步骤。
本发明实施例还提出了一种计算机存储介质，所述计算机存储介质存储有程序，所述程序执行时包括本发明实施例结合图14所描述的方法中的部分或全部的步骤。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不是必须针对相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第 二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本发明的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本发明的实施例所属技术领域的技术人员所理解。
在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的程序列表，可以具体实现在任何计算机可读介质中，以供指令执行系统、装置或设备(如基于计算机的系统、包括处理器的系统或其他可以从指令执行系统、装置或设备取指令并执行指令的系统)使用，或结合这些指令执行系统、装置或设备而使用。就本说明书而言，"计算机可读介质"可以是任何可以包含、存储、通信、传播或传输程序以供指令执行系统、装置或设备或结合这些指令执行系统、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电连接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。
应当理解，本发明的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA) 等。
本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。
此外，在本发明各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。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。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。
上述提到的存储介质可以是只读存储器，磁盘或光盘等。尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (33)

  1. 一种无线局域网的站点，其特征在于，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点，所述第一站点包括：
    帧接收模块，用于接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限；
    传输路径损耗值获取模块，用于根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值；
    发射功率确定模块，用于根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
    信号处理模块，用于根据所述发射功率确定模块确定的发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
  2. 如权利要求1所述的站点，其特征在于，所述发射功率确定模块包括：
    第一发送功率确定单元，用于根据公式P1-PL1,2≤SNR2 margin×N0确定所述发射功率的上限值；
    其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
  3. 如权利要求1-2任一项所述的站点，其特征在于，所述信号处理模块具体用于：
    判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
    若判断所述发射功率的上限值高于所述预设发射功率阈值中的最小值，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间；
    以所述目标发射功率向所述目标站点发送所述数据包。
  4. 如权利要求1-3任一项所述的站点，其特征在于，所述信号处理模块具体还用于：
    判断所述发射功率的上限值是否达到预设发射功率阈值中的最小值；
    若判断所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在所述已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
  5. 如权利要求1-4任一项所述的站点，其特征在于，还包括：
    帧发射模块，用于发射干扰值请求帧；
    所述帧接收模块还用于：
    接收所述第一站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
    站点选择模块，用于根据所述第一站点所在基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点；
    目标站点确定模块，用于在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
  6. 如权利要求5所述的站点，其特征在于，所述目标站点确定模块包括：
    第一确定单元，用于将最小的所述干扰强度值对应的站点确定为所述目标站点。
  7. 如权利要求5所述的站点，其特征在于，所述目标站点确定模块包括：
    传输路径损耗值获取单元，用于根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
    第二确定单元，用于将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
  8. 如权利要求5所述的站点，其特征在于，所述目标站点确定模块包括：
    传输路径损耗值获取单元，用于根据所述干扰强度值小于预设阈值的站点 发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到所述第一站点的通信链路的传输路径损耗值；
    第三确定单元，用于将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
  9. 如权利要求5-8任一项所述的站点，其特征在于，所述干扰源站点包括所述基本服务集中已经竞争到通信信道的源站点。
  10. 如权利要求1-9任一项所述的站点，其特征在于，还包括：
    信道矩阵信息估算模块，用于根据所述第二站点广播的控制帧，估算所述第二站点到第一站点的信道矩阵信息；
    所述发射功率确定模块包括：
    第二发送功率确定单元，用于根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值。
  11. 如权利要求10所述的站点，其特征在于，所述第二发送功率确定单元具体用于：
    根据公式
    Figure PCTCN2014088720-appb-100001
    确定所述发射功率的上限值；
    其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
    Figure PCTCN2014088720-appb-100002
    是从
    Figure PCTCN2014088720-appb-100003
    的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为所述第一站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
    Figure PCTCN2014088720-appb-100004
    为所述第一站点根据所述估算出的所述第二站点到所述第一站点的信道矩阵并利用信道互易性所估算出的M×N维从所述第一站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和所述第一站点的天线数目。
  12. 一种无线局域网的站点，其特征在于，所述站点为一个基本服务集中 已经竞争到通信信道的第二站点，所述第二站点包括：
    帧接收模块，用于接收所述第二站点所在基本服务集中的站点发送的请求发送帧；
    信噪比容限获取模块，用于根据所述请求发送帧获取信噪比容限；
    帧发射模块，用于广播携带所述信噪比容限的控制帧，以使所述第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
  13. 如权利要求12所述的站点，其特征在于，所述信噪比容限获取模块包括：
    接收信噪比值获取单元，用于获取所述请求发送帧的接收信噪比值；
    信噪比容限确定单元，用于根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
  14. 如权利要求12-13任一项所述的站点，其特征在于，所述控制帧包括允许发送帧；
    所述帧发射模块具体用于：
    将所述信噪比容限添加到所述允许发送帧中，并广播所述允许发送帧。
  15. 一种无线局域网的通信方法，其特征在于，包括：
    接收第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限，所述第二站点为一个基本服务集中已经竞争到通信信道的站点；
    根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到第一站点的通信链路的传输路径损耗值；
    根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
    根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送或者不发送数据包。
  16. 如权利要求15所述的方法，其特征在于，所述根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值包括：
    根据公式P1-PL1,2≤SNR2 margin×N0确定所述发射功率的上限值；
    其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率。
  17. 如权利要求15-16任一项所述的方法，其特征在于，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送数据包括：
    判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
    若是，则根据所述发射功率阈值和所述发射功率的上限值确定目标发射功率，所述目标发射功率在所述最小值与所述上限值之间；
    以所述目标发射功率向自身站点所在基本服务集中的目标站点发射所述数据包。
  18. 如权利要求15-16任一项所述的方法，其特征在于，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点不发送数据包括：
    判断所述发射功率的上限值是否高于预设发射功率阈值中的最小值；
    若所述发射功率的上限值小于所述预设发射功率阈值中的最小值，则在所述已经竞争到通信信道的第二站点占用所述通信信道时不发送所述数据包。
  19. 如权利要求15-18任一项所述的方法，其特征在于，所述根据确定的所述发射功率的上限值，针对在自身站点所在的基本服务集中的目标站点发送数据包之前，还包括：
    发射干扰值请求帧；
    接收自身站点所在基本服务集中的站点根据所述干扰值请求帧反馈的控制帧，所述控制帧携带对应站点受到干扰源站点的干扰强度值；
    根据所述基本服务集中的站点反馈的控制帧，获取干扰强度值小于预设阈值的站点；
    在所述干扰强度值小于预设阈值的站点中确定出所述目标站点。
  20. 如权利要求19所述的方法，其特征在于，所述在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
    将最小的所述干扰强度值对应的站点确定为所述目标站点。
  21. 如权利要求19所述的方法，其特征在于，所述在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
    根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到自身站点的通信链路的传输路径损耗值；
    将最小的所述传输路径损耗值对应的站点确定为所述目标站点。
  22. 如权利要求19所述的方法，其特征在于，所述在所述干扰强度值小于预设阈值的站点中确定出所述目标站点包括：
    根据所述干扰强度值小于预设阈值的站点发送的控制帧，分别获取所述干扰强度值小于预设阈值的站点到自身站点的通信链路的传输路径损耗值；
    将所述传输路径损耗值与所述干扰强度值之和的最小值所对应的站点确定为所述目标站点。
  23. 如权利要求19-22任一项所述的方法，其特征在于，所述干扰源站点包括所述基本服务集中已经竞争到通信信道的源站点。
  24. 如权利要求15-23任一项所述的方法，其特征在于，所述根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值之前，还包括：
    根据所述第二站点广播的控制帧，估算所述第二站点到自身站点的信道矩阵信息；
    根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值包括：
    根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信 息确定所述发射功率的上限值。
  25. 如权利要求24所述的方法，其特征在于，所述根据所述传输路径损耗值、所述第二站点的信噪比容限和所述信道矩阵信息确定所述发射功率的上限值包括：
    根据公式
    Figure PCTCN2014088720-appb-100005
    确定所述发射功率的上限值；
    其中，P1为所述发射功率的上限值，PL1,2为所述传输路径损耗值，δ2为信道估计误差，SNR2 margin为所述第二站点的信噪比容限，N0为噪声功率；
    Figure PCTCN2014088720-appb-100006
    的正交子空间中所抽取的正交矩阵，Cold(A)算子表示抽取矩阵A的任意d列，d为自身站点发送的数据流个数，AH表示矩阵A的共轭矩阵，tr(A)表示矩阵A的迹，A-1表示矩阵A的逆矩阵，
    Figure PCTCN2014088720-appb-100007
    为自身站点根据所述估算出的所述第二站点到自身站点的信道矩阵并利用信道互易性所估算出的M×N维从自身站点到所述第二站点的信道矩阵信息，其中，M和N分别表示所述第二站点和自身站点的天线数目。
  26. 一种无线局域网的通信方法，其特征在于，包括：
    接收自身站点所在基本服务集中的站点发送的请求发送帧；
    根据所述请求发送帧获取信噪比容限；
    广播携带所述信噪比容限的控制帧，以使自身站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
  27. 如权利要求26所述的方法，其特征在于，所述根据所述请求发送帧获取信噪比容限包括：
    获取所述请求发送帧的接收信噪比值；
    根据所述接收信噪比值和预设的最低参考信噪比值之间的差值确定所述信噪比容限。
  28. 如权利要求26-26任一项所述的方法，其特征在于，所述控制帧包括 允许发送帧；
    所述广播携带所述信噪比容限的控制帧包括：
    将所述信噪比容限添加到所述允许发送帧中，并广播所述允许发送帧。
  29. 一种计算机存储介质，其特征在于，所述计算机存储介质存储有程序，所述程序执行时包括权利要求15～25任一项所述的步骤。
  30. 一种计算机存储介质，其特征在于，所述计算机存储介质存储有程序，所述程序执行时包括权利要求26～28任一项所述的步骤。
  31. 一种无线局域网的站点，其特征在于，所述站点为一个基本服务集中已经竞争到通信信道的第二站点的信号覆盖区域内的第一站点，所述第一站点包括无线信号收发装置、存储器以及处理器，其中，所述存储器中存储一组程序代码，且所述处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
    通过所述无线信号收发装置接收所述第二站点广播的控制帧，所述控制帧携带所述第二站点的信噪比容限；
    根据所述控制帧的接收功率和所述第二站点发射所述控制帧的发射功率，获取所述第二站点到所述第一站点的通信链路的传输路径损耗值；
    根据所述传输路径损耗值和所述第二站点的信噪比容限确定发射功率的上限值；
    根据确定的所述发射功率的上限值，针对在所述第一站点所在的基本服务集中的目标站点发送或者不发送数据包。
  32. 一种无线局域网的站点，其特征在于，所述站点为一个基本服务集中已经竞争到通信信道的第二站点，所述第二站点包括无线信号收发装置、存储器以及处理器，其中，所述存储器中存储一组程序代码，且所述处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
    通过所述无线信号收发装置接收第二站点所在基本服务集中的站点发送的请求发送帧；
    根据所述请求发送帧获取信噪比容限；
    通过所述无线信号收发装置广播携带所述信噪比容限的控制帧，以使第二站点信号覆盖区域内的第一站点根据所述信噪比容限确定所述第一站点的发射功率的上限值，并使所述第一站点根据所述确定的发射功率的上限值发送或者不发送数据包。
  33. 一种无线局域网通信系统，其特征在于，所述系统包括至少第一站点和第二站点，其中：
    第一站点为如权利要求1～11任一项所述的站点；
    第二站点为如权利要求12～14任一项所述的站点。
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