WO2016110241A1 - 隐藏站点的检测方法、系统、站点及计算机存储介质 - Google Patents

隐藏站点的检测方法、系统、站点及计算机存储介质 Download PDF

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Publication number
WO2016110241A1
WO2016110241A1 PCT/CN2016/070121 CN2016070121W WO2016110241A1 WO 2016110241 A1 WO2016110241 A1 WO 2016110241A1 CN 2016070121 W CN2016070121 W CN 2016070121W WO 2016110241 A1 WO2016110241 A1 WO 2016110241A1
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sta
radio frame
transmission
frame
start time
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PCT/CN2016/070121
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English (en)
French (fr)
Inventor
江岸明
吕开颖
田开波
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中兴通讯股份有限公司
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Publication of WO2016110241A1 publication Critical patent/WO2016110241A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • 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 local area networks (WLAN), and in particular, to a method, system, STA, and computer storage medium for detecting a hidden station (STA, STAtion).
  • WLAN wireless local area networks
  • STA hidden station
  • the IEEE 802.11 group of the Institute of Electrical and Electronics Engineers has defined a series of standards such as 802.11a/b/g/n/ac to meet the growing demand for communication.
  • the dynamic channel detection threshold technique is an alternative technology for improving the channel multiplexing rate and solving the network efficiency, which has attracted extensive attention and research.
  • a basic service set (BSS, Basic Service Set) can be formed by an access point (AP, Access Point) and associated STAs.
  • Hidden STAs are a typical problem to be solved. Since not all STAs can be within the coverage of other STAs in one BSS, when one STA is transmitting data to another STA, other STAs This communication process may not be perceived, that is, other STAs may become hidden STAs of the STA, thereby causing collisions. For example, as shown in FIG. 1 , when STA A transmits a service to STA B, STA C and STA A are hidden STAs, and STA C and STA B can hear each other. STA C also starts to transmit traffic to STA D and collides with the service transmitted by STA A, causing STA B to fail to receive.
  • the embodiments of the present invention provide a method, a system, a STA, and a computer storage medium for detecting a hidden STA.
  • An embodiment of the present invention provides a method for detecting a hidden STA, which is applied to a source STA, and includes:
  • the number of the second radio frames is one or more.
  • the physical layer signaling carrying information of the first radio frame indicates that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame are indicated by the Medium Access Control (MAC) layer signaling of the first radio frame.
  • MAC Medium Access Control
  • the method when the feedback frame of the destination STA is received, and the received feedback frame indicates that the RTS is sent by using the request, the method further includes:
  • RTS is used during the next channel competition.
  • the method after receiving the feedback frame of the destination STA, the method further includes:
  • the RTS is used in the next channel competition.
  • the embodiment of the present invention further provides a method for detecting a hidden STA, which is applied to a destination STA, and includes:
  • the source STA Receiving, by the source STA, a first radio frame, where the first radio frame carries a transmission start time of the second radio frame that is sent before the first radio frame and does not receive the destination STA feedback frame, and Transmission time;
  • the method further includes:
  • the method further includes:
  • the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame are stored locally as the radio frame transmission parameter set of the source STA.
  • Hide STAs including:
  • the sent feedback frame includes indication information indicating that the source STA uses the RTS when contending for the next channel.
  • the sent feedback frame includes the identification number and/or address of the hidden STA of the source STA.
  • the embodiment of the present invention further provides an STA, including: a first receiving unit and a first sending unit;
  • the first sending unit is configured to send a first radio frame to the destination STA, where the first radio frame is sent before the first radio frame, and the first receiving unit does not receive the destination STA feedback frame.
  • the transmission start time and transmission duration of the second radio frame are configured to send a first radio frame to the destination STA, where the first radio frame is sent before the first radio frame, and the first receiving unit does not receive the destination STA feedback frame.
  • the STA further includes a contention unit
  • the first receiving unit is configured to receive a feedback frame of the destination STA
  • the contention unit is configured to use the RTS in the next channel contention process when the received feedback frame indicates that the RTS is used.
  • the STA further includes a contention unit
  • the first receiving unit is configured to receive a feedback frame of the destination STA
  • the contention unit is configured to use the RTS in the next channel competition process when the number of hidden STAs is determined to be higher than a preset threshold.
  • An embodiment of the present invention further provides an STA, including: a second receiving unit and a detecting unit;
  • the second receiving unit is configured to receive a first radio frame sent by the source STA, where the first radio frame carries the second radio frame that is sent before the first radio frame and does not receive the destination STA feedback frame. Start time and transmission time;
  • the detecting unit is configured to determine, according to a transmission start time and a transmission duration of the second radio frame carried in the first radio frame, and a radio frame transmission parameter set of other STAs stored locally, whether the source STA is determined There is a hidden STA.
  • the STA further includes: a second sending unit, configured to send a feedback frame to the source STA.
  • the detecting unit is further configured to store the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • An embodiment of the present invention further provides a detection system for a hidden STA, including: a source STA and a destination STA; among them,
  • the source STA is configured to send a first radio frame to the destination STA, where the first radio frame carries a second radio frame that is sent before the first radio frame and does not receive the destination STA feedback frame.
  • the destination STA is further configured to: after receiving the first radio frame, send a feedback frame to the source STA;
  • the source STA is further configured to receive a feedback frame sent by the destination STA.
  • the source STA is further configured to: when the received feedback frame indicates that the RTS is used, the RTS is used in the next channel competition; or, when the number of the hidden STAs is determined to be higher than the preset threshold, RTS is used during the next channel competition.
  • the destination STA is further configured to store the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • the embodiment of the present invention further provides a computer storage medium, the computer storage medium includes a set of instructions, when the instruction is executed, causing at least one processor to execute the detection method of the hidden STA on the source STA side, or execute The above-described method for detecting a hidden STA on the STA side.
  • the source STA sends a first radio frame to the destination STA, and the first radio frame is sent before the first radio frame and is not received.
  • the parameter set determines whether the source STA has a hidden STA, and thus, the hidden STA can be detected simply and efficiently.
  • FIG. 1 is a schematic diagram of a collision problem caused by a hidden STA in the related art
  • FIG. 2 is a schematic flowchart of a method for detecting a hidden STA according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a STA according to Embodiment 8 of the present invention.
  • FIG. 4 is a schematic structural diagram of another STA according to Embodiment 8 of the present invention.
  • FIG. 5 is a schematic structural diagram of a detection system of a hidden STA according to Embodiment 8 of the present invention.
  • the source STA sends a first radio frame to the destination STA, where the first radio frame carries the second one that is sent before the first radio frame and that does not receive the destination STA feedback frame. a transmission start time and a transmission duration of the radio frame; the destination STA according to the transmission start time and transmission duration of the second radio frame carried in the first radio frame, and a radio frame transmission parameter set of other STAs stored locally And determining whether the source STA has a hidden STA.
  • the embodiment provides a method for detecting a hidden STA, which is applied to a source STA, and the method includes: sending, to a destination STA, a first radio frame, where the first radio frame is sent before the first radio frame and is not received.
  • the destination STA feeds back a transmission start time and a transmission duration of the second radio frame of the frame.
  • the source STA may be a STA in the BSS
  • the destination STA may be an AP in the BSS
  • the source STA may also be an AP in the BSS
  • the destination STA may be a STA in the BSS .
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries the transmission start time and the transmission duration of the N second radio frames; until the destination STA is received. Up to the feedback frame, the N second radio frames may be referred to as hidden STAs to detect radio frames.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, or may be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • the method further includes:
  • RTS is used during the next channel competition.
  • the method may further include:
  • the actual STA is saved locally after receiving the feedback frame to determine the number of locally hidden STAs.
  • the source STA according to the identification number and/or address of the hidden STA included in the current feedback frame (the hidden STA information carried in the current feedback frame) and the identification number of the hidden STA included in the local historical feedback frame and/or Or the address (hidden STA information carried in the historical feedback frame) to determine the number of local (self) hidden STAs.
  • the preset threshold may be determined according to actual conditions of the network.
  • This embodiment further provides another method for detecting a hidden STA, which is applied to a destination STA, and the method includes:
  • the source STA Receiving, by the source STA, a first radio frame, where the first radio frame carries a transmission start time and a transmission duration of the second radio frame that is sent before the first radio frame and that does not receive the destination STA feedback frame;
  • the source STA may be a STA in the BSS, and the destination STA may be an AP in the BSS; the source STA may also be an AP in the BSS; correspondingly, the destination STA may be a STA in the BSS .
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries the transmission start time and the transmission duration of the N second radio frames; until the destination STA is received. Up to the feedback frame, the N second radio frames may be referred to as hidden STAs to detect radio frames.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, It can also be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • the destination STA After receiving the first radio frame, the destination STA parses the first radio frame to obtain a transmission start time and a transmission duration of the second radio frame.
  • the method can also include:
  • the destination STA After receiving the first radio frame, the destination STA sends a feedback frame to the source STA to confirm that the first radio frame has been received.
  • the sent feedback frame may include indication information indicating that the source STA uses the RTS when contending for the next channel.
  • the transmitted feedback frame may contain the identification number and/or address of the hidden STA of the source STA, so that the source STA determines the number of hidden STAs.
  • the method can also include:
  • the destination STA stores the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • each time the target STA receives a hidden STA to detect a radio frame a corresponding radio frame transmission parameter set is formed.
  • the destination STA compares the radio frame transmission parameter set of the source STA with the radio frame transmission parameter set of other STAs stored locally, and determines a transmission start time of the radio frame transmission parameter set of the source STA and Determining, by the source STA, the transmission start time and the transmission duration, when the time period covered by the transmission duration overlaps with the transmission start time and the time period covered by the transmission duration in the radio frame transmission parameter set of the other STAs
  • Other STAs with overlapping time periods are mutually hidden STAs.
  • the source STA and the other STA are not considered to be hidden STAs. .
  • the destination STA may use a sending address corresponding to a radio frame transmission parameter set to represent a corresponding source STA.
  • the method for detecting the third hidden STA in this embodiment includes the following steps:
  • Step 201 The source STA sends a first radio frame to the destination STA, where the first radio frame carries a transmission start time of the second radio frame that is sent before the first radio frame and does not receive the destination STA feedback frame. Transmission time;
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries the transmission start time and the transmission duration of the N second radio frames; until the destination STA is received. Up to the feedback frame, the N second radio frames may be referred to as hidden STAs to detect radio frames.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, It can also be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • Step 202 The destination STA determines whether the source STA is based on a transmission start time and a transmission duration of the second radio frame carried in the first radio frame, and a radio frame transmission parameter set of other STAs stored locally. There is a hidden STA.
  • the destination STA parses the first radio frame to obtain a transmission start time and a transmission duration of the second radio frame.
  • the method may further include:
  • the destination STA After receiving the first radio frame, the destination STA sends a feedback frame to the source STA to confirm that the first radio frame has been received.
  • the sent feedback frame may include indication information indicating that the source STA uses the RTS when contending for the next channel; correspondingly, after receiving the feedback frame, the source STA uses the RTS in the next channel competition, so that the information can be effectively reduced. Hide collision problems caused by STAs.
  • the sent feedback frame may include the identification number and/or address of the hidden STA of the source STA; correspondingly, after receiving the feedback frame, the source STA may save locally to determine the number of locally hidden STAs.
  • the source STA according to the identification number and/or address of the hidden STA included in the current feedback frame (the hidden STA information carried in the current feedback frame) and the identification number of the hidden STA included in the local historical feedback frame and/or Or the address (the hidden STA information carried in the historical feedback frame) to determine the number of local hidden STAs, and determine whether the number of local hidden STAs is higher than the preset. Threshold, when the number of hidden STAs is higher than the preset threshold, the RTS is used in the next channel competition, so that the collision problem caused by the hidden STA can be effectively reduced.
  • the preset threshold may be determined according to actual conditions of the network.
  • the method may further include:
  • the destination STA stores the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • each time the target STA receives a hidden STA to detect a radio frame a corresponding radio frame transmission parameter set is formed.
  • the destination STA compares the radio frame transmission parameter set of the source STA with the radio frame transmission parameter set of other STAs stored locally, and determines a transmission start time of the radio frame transmission parameter set of the source STA and Determining, by the source STA, the transmission start time and the transmission duration, when the time period covered by the transmission duration overlaps with the transmission start time and the time period covered by the transmission duration in the radio frame transmission parameter set of the other STAs
  • Other STAs with overlapping time periods are mutually hidden STAs.
  • the source STA and the other STA are not considered to be hidden STAs. .
  • the destination STA may use a sending address corresponding to a radio frame transmission parameter set to represent a corresponding source STA.
  • the source STA sends a first radio frame to the destination STA, where the first radio frame carries the first radio frame and does not receive the destination STA feedback frame. a transmission start time and a transmission duration of the second radio frame; the destination STA according to the transmission start time and transmission duration of the second radio frame carried in the first radio frame, and radio frame transmission parameters of other STAs stored locally
  • the set determines whether the source STA has a hidden STA, and thus, the hidden STA can be detected simply and efficiently.
  • This embodiment describes a process of determining, by an AP, a retransmission frame of two STAs of STA 1 and STA 2, and determining a hidden STA.
  • the STA 1 After the STA 1 sends a radio frame (DATA1) to the AP, the ACK is not received by the AP, and the STA 1 re-competes the channel and retransmits the DATA1 to the AP.
  • the retransmission radio frame is retransmitted to the AP.
  • Rdata1 wherein STA 1 uses the reserved bit information of the physical layer signaling domain in Rdata1 to indicate that the frame contains the start time and the transmission duration of the transmission DATA1, and indicates the start of the transmission of DATA1 by the new MAC layer signaling in Rdata1.
  • Time and transmission duration; the transmission durations of Rdata1 and DATA1 are the same, and the duration indicated by the Duration field in STA1 in Rdata1 is the same as the transmission duration of the transmission DATA1 indicated by the new MAC layer signaling.
  • STA 2 sends a radio frame (DATA2) to the AP to wait for the SIFS interval, and does not receive the ACK fed back by the AP.
  • STA 2 re-competes the channel and retransmits DATA2 to the AP.
  • the retransmission radio frame is recorded as Rdata2; 2 In Rdata2, the reserved bit information of the physical layer signaling domain is used to indicate that the frame includes the start time and the transmission duration of the transmission DATA2, and the start time point and the transmission duration of the transmission DATA2 are indicated by the new MAC layer signaling in Rdata2; Rdata2 Different from the transmission duration of DATA2, the duration indicated by the STA2 in the Duration field in Rdata2 is different from the transmission duration of DATA2 indicated by the new MAC layer signaling.
  • the AP receives Rdata1 and Rdata2, and returns feedback to STA1 and STA2 to confirm that Rdata1 and Rdata2 have been received, and records the sender address corresponding to Rdata1, the start time of DATA1 transmission, and the transmission duration according to the received Rdata1; Rdata2, records the sender address corresponding to Rdata2, the start time of the DATA2 transmission, and the transmission duration; the AP finds according to the recorded information that the time of the last data transmission between STA 1 and STA 2 overlaps, thereby determining that STA 1 and STA 2 are mutually The STA is hidden and a collision occurs due to a problem of hiding the STA.
  • This embodiment describes a process of determining a hidden STA by receiving a new radio frame sent by two STAs of STA 1 and STA 2 by the AP.
  • STA 1 and STA 2 fail to carry the last transmission in the transmitted new radio frame.
  • the STA 1 After the STA 1 sends a radio frame (DATA1) to the AP to wait for the SIFS interval, it does not receive the ACK fed back by the AP. At the next moment, the AP sends a new radio frame (DATA) to the STA 1. After receiving the DATA, the STA 1 sends the AP to the AP. Replying to the ACK; wherein the STA 1 uses the reserved bit information of the physical layer signaling domain in the ACK to indicate that the frame includes the start time and the transmission duration of the transmission DATA1, and indicates the start time of the transmission of the DATA1 by the new MAC layer signaling in the ACK. And transmission time.
  • DATA1 radio frame
  • the STA 1 After receiving the DATA, the STA 1 sends the AP to the AP. Replying to the ACK; wherein the STA 1 uses the reserved bit information of the physical layer signaling domain in the ACK to indicate that the frame includes the start time and the transmission duration of the transmission DATA1, and indicates the start time of
  • the STA 2 sends a radio frame (DATA2) to the AP to wait for the SIFS interval, and does not receive the ACK that the AP feeds back.
  • the AP sends a new radio frame (data) to the STA 2
  • the STA 2 sends the data to the STA 2
  • the AP replies to the ACK; wherein the STA 2 uses the reserved bit information of the physical layer signaling domain in the ACK to indicate that the frame includes the start time and the transmission duration of the transmission DATA2, and indicates the start of the transmission of the DATA2 by the new MAC layer signaling in the ACK.
  • the time point and the transmission time length; the transmission durations of ACK and DATA2 are different, and the duration indicated by the STA 2 in the Duration field of the ACK is different from the transmission duration of the DATA 2 indicated by the new MAC layer signaling.
  • the AP receives the ACK returned by the STA 1 and the STA 2, and records the sender address corresponding to the ACK, the start time of the DATA1 transmission, and the transmission duration according to the received ACK returned by the STA 1, and records according to the ACK returned by the received STA 2.
  • the station AP receives a new radio frame sent by each STA of STA 1 and STA 2, Determining the process of hiding the STA, in other words, the STA 1 and the STA 2 carry the frame transmission duration and the start time of the previous transmission failure in the transmitted new radio frame; accordingly, the AP passes the information in the received new radio frame, Determine the hidden STA.
  • the STA 1 After the STA 1 sends a radio frame (DATA1) to the AP to wait for the SIFS interval, the ACK is not received by the AP, and the STA 1 re-contends to the transmission opportunity at the next moment, and sends a new radio frame (DATA2) to the AP; STA 1 uses the reserved bit information of the physical layer signaling domain in DATA2 to indicate that the frame contains the start time and transmission duration of the transmission DATA1, and indicates the start time and transmission duration of the last transmission of DATA1 through the new MAC layer signaling in DATA2.
  • the transmission duration of DATA2 and DATA1 is the same, and the duration indicated by the Duration field of STA1 in DATA2 is the same as the transmission duration of the transmission DATA1 indicated by the new MAC layer signaling.
  • STA 2 After STA 2 sends a radio frame (DATA3) to the AP to wait for the SIFS interval, the ACK is not received by the AP, STA 2 re-competes the channel, and sends a new radio frame (DATA4) to the AP; wherein STA 2 is in DATA4.
  • the reserved bit information of the physical layer signaling domain indicates that the frame includes the start time and the transmission duration of the transmission DATA3, and indicates the start time point and the transmission duration of the transmission DATA3 through the new MAC layer signaling in DATA4; the transmission of DATA4 and DATA3
  • the duration is different, and the duration indicated by the STA 2 in the Duration field in DATA4 is different from the duration of transmission of DATA3 indicated by the new MAC layer signaling.
  • the AP receives DATA2 and DATA4, and returns feedback to STA 1 and STA 2 to confirm that DATA2 and DATA4 have been received, and according to the received DATA2, records the sender address corresponding to DATA2, the start time of DATA1 transmission, and the transmission duration; DATA4, record the sender address corresponding to DATA4, the start time of the DATA3 transmission, and the transmission duration; the AP finds according to the recorded information that the time of the last data transmission between STA 1 and STA 2 overlaps, thereby determining that STA 1 and STA 2 are mutually The STA is hidden and a collision occurs due to a problem of hiding the STA.
  • This embodiment illustrates the case where STAs of two BSSs collide due to hidden STA problems.
  • STA 1 sends a radio frame (DATA1) to AP 1 to complete the waiting for the SIFS interval, and does not receive the ACK fed back by AP 1, STA 1 re-competes the channel, and retransmits DATA1 to AP 1, and the retransmitted radio frame is recorded as Rdata1;
  • the STA 1 uses the reserved bit information of the physical layer signaling domain in Rdata1 to indicate that the current frame includes the start time and the transmission duration of the transmission DATA1, and indicates the start time and the transmission duration of the transmission DATA1 through the new MAC layer signaling in Rdata1. .
  • STA 2 sends a radio frame (DATA2) to AP 2 to complete the waiting for SIFS interval, does not hear the ACK fed back by AP 2, STA 2 re-competes the channel, and retransmits DATA2 to AP 2, and the retransmitted radio frame is recorded as Rdata2;
  • the STA 2 uses the reserved bit information of the physical layer signaling domain in Rdata2 to indicate that the frame includes the start time and the transmission duration of the transmission DATA2, and indicates the start time and the transmission duration of the transmission DATA2 through the new MAC layer signaling in Rdata2. .
  • AP 1 receives Rdata1 and Rdata2, and feeds back to STA 1 to confirm that Rdata1 has been received. According to the received Rdata1, the sender address corresponding to Rdata1, the start time of DATA1 transmission, and the transmission duration are recorded. According to the received Rdata2, Rdata2 is recorded. The corresponding sender address, the start time of the DATA2 transmission, and the transmission duration; the AP 1 finds that the time of the last data transmission of STA 1 and STA 2 overlaps according to the recorded information, thereby determining that STA 1 and STA 2 are hidden STAs, And a collision occurs due to the problem of hiding the STA.
  • AP 2 receives Rdata1 and Rdata2, and feeds back to STA 2 to confirm that Rdata2 has been received, and records the sender address corresponding to Rdata1, the start time of DATA1 transmission, and the transmission duration according to the received Rdata1; and records Rdata2 according to the received Rdata2.
  • Corresponding sender address, start time of DATA2 transmission, and transmission duration; AP21 finds that the time of the last data transmission of STA 1 and STA 2 overlaps according to the recorded information, thereby determining that STA 1 and STA 2 are hidden STAs, and A collision occurred due to a problem with the hidden STA.
  • This embodiment illustrates a case where a STA of one BSS and an AP of another BSS collide due to a hidden STA problem.
  • STA 1 sends a radio frame (DATA1) to AP 1 to complete the waiting for the SIFS interval, and does not hear the ACK fed back by AP 1, STA 1 re-competes the channel, and retransmits DATA1 to AP 1, and the retransmitted radio frame is recorded as Rdata1;
  • the STA 1 uses the reserved bit information of the physical layer signaling domain in Rdata1 to indicate that the current frame includes the start time and the transmission duration of the transmission DATA1, and indicates the start time and the transmission duration of the transmission DATA1 through the new MAC layer signaling in Rdata1. .
  • the AP 2 After the AP 2 sends a radio frame (DATA2) to the STA 2 to wait for the SIFS interval, the ACK is not heard by the STA 2, the AP 2 re-competes the channel, and retransmits the DATA2 to the STA 2, and the retransmitted radio frame is recorded as Rdata2;
  • the AP 2 uses the reserved bit information of the physical layer signaling domain in Rdata2 to indicate that the frame includes the start time and the transmission duration of the transmission DATA2, and indicates the start time point and transmission of the DATA2 by the new MAC layer signaling in Rdata2. duration.
  • AP 1 receives Rdata1 and Rdata2, and feeds back to STA 1 to confirm that Rdata1 has been received. According to the received Rdata1, the sender address corresponding to Rdata1, the start time of DATA1 transmission, and the transmission duration are recorded. According to the received Rdata2, Rdata2 is recorded. The corresponding sender address, the start time of the DATA2 transmission, and the transmission duration; the AP 1 finds that the time of the last data transmission of STA 1 and AP 2 overlaps according to the recorded information, thereby determining that STA 1 and STA 2 are hidden STAs, And a collision occurs due to the problem of hiding the STA.
  • STA 2 receives Rdata1 and Rdata2, and feeds back to AP 2 to confirm that Rdata2 has been received, and records the sender address corresponding to Rdata1, the start time of DATA1 transmission, and the transmission duration according to the received Rdata1; and records Rdata2 according to the received Rdata2.
  • This embodiment illustrates the case where both transmissions fail.
  • STA 1 sends a radio frame (DATA1) to the AP and waits for the SIFS interval.
  • the ACK fed back to the AP the STA 1 re-contends to the transmission opportunity at the next moment, and sends another radio frame (DATA2) to the AP; wherein the STA 1 uses the reserved bit information of the physical layer signaling domain in DATA2 to indicate that the frame contains
  • the start time and transmission duration of DATA1 are transmitted, and the start time and transmission duration of DATA1 are indicated by new MAC layer signaling in DATA2.
  • STA 1 does not receive the ACK of the AP feedback after sending DATA2, STA 1 re-contends to the transmission opportunity at the next moment, and sends a third radio frame (DATA3) to the AP; wherein STA 1 utilizes the physical layer signaling domain in DATA3
  • the reserved bit information indicates that the frame includes the start time and transmission duration of the transmission DATA1 and the start time and transmission duration of the transmission DATA 2, and indicates the start time and transmission duration of the transmission DATA1 and the transmission of the DATA2 by the new MAC layer signaling in DATA3. The starting time and the length of the transmission.
  • STA 2 sends a radio frame (DATA4) to the AP to wait for the SIFS interval, and does not receive the ACK fed back by the AP.
  • STA 2 re-competes the channel and retransmits DATA4 to the AP.
  • the retransmitted radio frame is recorded as Rdata4; 2 In Rdata4, the reserved bit information of the physical layer signaling domain is used to indicate that the frame includes the start time and the transmission duration of the transmission DATA4, and the start time point and the transmission duration of the transmission DATA4 are indicated by the new MAC layer signaling in Rdata4; Rdata4 Different from the transmission duration of DATA4, the duration indicated by the STA2 in the Duration field in Rdata4 is different from the transmission duration of DATA4 indicated by the new MAC layer signaling.
  • the AP receives DATA3 and Rdata4, and returns feedback to STA1 and STA2 to confirm that DATA3 and Rdata4 have been received, and according to the received DATA3, records the sender address corresponding to DATA3, the start time of DATA1 transmission, and the transmission duration and transmission of DATA2. Time and transmission duration; according to the received Rdata4, record the sender address corresponding to Rdata4, the start time of the DATA4 transmission, and the transmission duration; the AP finds according to the recorded information that the time of the last data transmission between STA 1 and STA 2 overlaps. It is thus determined that STA 1 and STA 2 are hidden STAs from each other, and a collision occurs due to the problem of hiding the STA.
  • the embodiment provides a STA.
  • the STA includes: a first receiving unit 31 and a first sending unit 32;
  • the first sending unit 32 is configured to send a first radio frame to the destination STA, where the first radio frame is sent before the first radio frame, and the first receiving unit 31 does not receive the destination STA.
  • the transmission start time and transmission duration of the second radio frame of the feedback frame are configured to send a first radio frame to the destination STA, where the first radio frame is sent before the first radio frame, and the first receiving unit 31 does not receive the destination STA.
  • the STA is a source STA; the source STA may be a STA in the BSS, and the destination STA may be an AP in the BSS; the source STA may also be an AP in the BSS; correspondingly, the destination STA It can be a STA in the BSS.
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries a transmission start time and a transmission duration of the N second radio frames; until the first receiving unit
  • the N second radio frames may be referred to as hidden STAs to detect radio frames until the feedback frame of the destination STA is received.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, or may be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • the STA may further include: a competition unit; wherein
  • the first receiving unit 31 is configured to receive a feedback frame of the destination STA.
  • the contention unit is configured to receive the reverse when the received feedback frame indicates that the RTS is used.
  • the feed frame contains the indication information indicating that the source STA uses the RTS when contending for the next channel, and uses the RTS in the next channel competition.
  • the contention unit is configured to determine whether the number of hidden STAs is higher than a preset threshold when the received feedback frame includes the identification number and/or address of the hidden STA of the source STA, and the number of hidden STAs When the threshold is higher than the preset threshold, the RTS is used during the next channel competition.
  • the actual content is that the contention unit saves the feedback frame locally to determine the number of locally hidden STAs.
  • the contention unit according to the identification number and/or address of the hidden STA included in the current feedback frame (the hidden STA information carried in the feedback frame) and the identification number of the hidden STA included in the local historical feedback frame and / or address (hidden STA information carried in the historical feedback frame) to determine the number of local (self) hidden STAs.
  • the preset threshold may be determined according to actual conditions of the network.
  • the first receiving unit 31 may be implemented by a receiver in the STA; the first transmitting unit 32 may be implemented by a transmitter in the STA; the contention unit may be a central processor in the STA (CPU, Central Processing) Unit), Microcontrol Unit (MCU), Digital Signal Processor (DSP) or Field-Programmable Gate Array (FPGA) are implemented in combination with transceivers.
  • the STA Central Processing
  • MCU Microcontrol Unit
  • DSP Digital Signal Processor
  • FPGA Field-Programmable Gate Array
  • the present embodiment further provides another STA, which is a destination STA.
  • the STA includes: a second receiving unit 41 and a detecting unit 42;
  • the second receiving unit 41 is configured to receive a first radio frame sent by the source STA, where the first radio frame carries the second radio frame that is sent before the first radio frame and does not receive the destination STA feedback frame. Transmission start time and transmission duration;
  • the detecting unit 42 is configured to: according to the transmission start time and the transmission duration of the second radio frame carried in the first radio frame, and the radio frame transmission parameters of other locally saved STAs The number set determines whether the source STA has a hidden STA.
  • the source STA may be a STA in the BSS, and the destination STA may be an AP in the BSS; the source STA may also be an AP in the BSS; correspondingly, the destination STA may be a STA in the BSS .
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries the transmission start time and the transmission duration of the N second radio frames; until the destination STA is received. Up to the feedback frame, the N second radio frames may be referred to as hidden STAs to detect radio frames.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, or may be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • the detecting unit 42 After receiving the first radio frame, the detecting unit 42 first parses the first radio frame to obtain a transmission start time and a transmission duration of the second radio frame.
  • the STA may further include: a second sending unit configured to send a feedback frame to the source STA to confirm that the first radio frame has been received.
  • the sent feedback frame may include indication information indicating that the source STA uses the RTS when contending for the next channel.
  • the transmitted feedback frame may include an identification number and/or address of the hidden STA of the source STA, to The source STA determines the number of hidden STAs.
  • the detecting unit 42 is further configured to store the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • each time the target STA receives a hidden STA to detect a radio frame a corresponding radio frame transmission parameter set is formed.
  • the detecting unit 42 is configured to compare the radio frame transmission parameter set of the source STA with the radio frame transmission parameter set of other STAs stored locally, and determine that the transmission of the radio frame transmission parameter set of the source STA starts. Determining the source STA, the transmission start time, and the transmission duration when the time period covered by the time and the transmission duration overlaps with the transmission start time and the time period covered by the transmission duration in the radio frame transmission parameter set of the other STAs The other STAs that overlap in the covered time period are mutually hidden STAs.
  • the source STA and the other STA are not considered to be hidden STAs. .
  • the detecting unit 42 may use a sending address corresponding to a radio frame transmission parameter set to represent a corresponding source STA.
  • the second receiving unit 41 may be implemented by a receiver in the STA; the detecting unit 42 may be implemented by a CPU, an MCU, a DSP or an FPGA in the STA; the second transmitting unit may be implemented by a transmitter of the STA.
  • the embodiment further provides a detection system for the hidden STA.
  • the system includes: a source STA 51 and a destination STA 52;
  • the source STA 51 is configured to send a first radio frame to the destination STA 52, where the first radio frame carries a second packet that is sent before the first radio frame and does not receive the feedback frame of the destination STA 52.
  • the destination STA 52 is configured to be according to the second wireless carried in the first radio frame
  • the source STA 51 may be a STA in the BSS, and the destination STA 52 may be an AP in the BSS; the source STA 51 may also be an AP in the BSS; correspondingly, the destination STA 52 It can be a STA in the BSS.
  • the number of the second radio frames may be one or more. Specifically, for example, if the number of the second radio frames is N, the first radio frame carries the transmission start time and the transmission duration of the N second radio frames; until the destination STA is received. Up to the feedback frame of 52, the N second radio frames may be referred to as hidden STAs to detect radio frames.
  • the data carried by the first radio frame and the second radio frame may be the same or different; the modulation mode and bandwidth used by the first radio frame and the second radio frame may be the same. different.
  • the first radio frame may be a retransmission frame of the second radio frame, or may be a new radio frame.
  • the new radio frame may be a feedback frame sent by the source STA 51 for the received radio frame, or may be a brand new radio frame.
  • the physical layer signaling carrying information of the first radio frame may indicate that the first radio frame includes a transmission start time and a transmission duration of the second radio frame.
  • the transmission start time and the transmission duration of the second radio frame may be indicated by MAC layer signaling of the first radio frame.
  • the destination STA 52 After receiving the first radio frame, the destination STA 52 parses the first radio frame to obtain a transmission start time and a transmission duration of the second radio frame.
  • the destination STA 52 is further configured to: after receiving the first radio frame, send a feedback frame to the source STA 51 to confirm that the first radio frame has been received;
  • the source STA 51 is further configured to receive a feedback frame sent by the destination STA 52.
  • the sent feedback frame may include an RTS indicating that the source STA next contends for the channel.
  • the source STA 51 is further configured to use the RTS in the next channel competition process after receiving the feedback frame, so that the collision problem caused by the hidden STA can be effectively reduced.
  • the sent feedback frame may include the identification number and/or address of the hidden STA of the source STA; correspondingly, after receiving the feedback frame, the source STA 51 may save locally to determine the number of locally hidden STAs.
  • the source STA 51 is further configured to: after receiving the feedback frame, according to the identification number and/or address of the hidden STA included in the current feedback frame (hidden STA information carried in the current feedback frame) and the history stored locally
  • the number of hidden STAs in the local area is determined by the number of the hidden STAs in the feedback frame, and the number of the hidden STAs in the local frame is higher than the preset threshold.
  • the RTS is used in the next channel competition, so that the collision problem caused by the hidden STA can be effectively reduced.
  • the preset threshold may be determined according to actual conditions of the network.
  • the destination STA 52 is further configured to store the transmission start time, the transmission duration, and the corresponding transmission address of the second radio frame as a radio frame transmission parameter set of the source STA.
  • the destination STA 52 generates a corresponding radio frame transmission parameter set after receiving a hidden STA to detect a radio frame.
  • the destination STA 52 is specifically configured to compare the radio frame transmission parameter set of the source STA 51 with the radio frame transmission parameter set of other STAs stored locally, and determine the radio frame of the source STA 51. Determining the source STA 51 and the time period covered by the transmission start time and the transmission duration in the transmission parameter set overlap with the transmission start time and the time period covered by the transmission duration in the radio frame transmission parameter set of the other STAs The other STAs that overlap in the time period covered by the transmission start time and the transmission duration are mutually hidden STAs.
  • the transmission start time in the radio frame transmission parameter set of the source STA is the same as the transmission start time in the radio frame transmission parameter set of the other STAs, the source STA is not considered
  • the STAs are hidden from each other with the other STAs.
  • the destination STA 52 may use a sending address corresponding to a radio frame transmission parameter set to represent a corresponding source STA.
  • the source STA 51 sends a first radio frame to the destination STA 52, and the first radio frame carries the feedback before the first radio frame and does not receive the destination STA 52.
  • the destination STA 52 is configured according to a transmission start time and a transmission duration of the second radio frame carried in the first radio frame, and other locally saved STAs
  • the wireless frame transmission parameter set determines whether the source STA 51 has a hidden STA, and thus, the hidden STA can be detected simply and efficiently.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the device is implemented in a flow chart A function specified in a block or blocks of a process or multiple processes and/or block diagrams.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • an embodiment of the present invention further provides a computer storage medium, where the computer storage medium includes a set of instructions, when the instruction is executed, causing at least one processor to perform the detecting method of the hidden STA on the source STA side. Or, the detection method of the hidden STA on the STA side of the above-described purpose is performed.

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Abstract

本发明公开了一种隐藏站点(STA)的检测方法，包括：源STA向目的STA发送第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；所述目的STA根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。本发明同时还公开了一种隐藏STA的检测系统、STA及计算机存储介质。

Description

隐藏站点的检测方法、系统、站点及计算机存储介质 技术领域
本发明涉及无线局域网(WLAN，Wireless Local Area Networks)领域，尤其涉及一种隐藏站点(STA，STAtion)的检测方法、系统、STA及计算机存储介质。
背景技术
目前，使用WLAN进行数据通信已经十分普遍，全球对WLAN覆盖需求日益增长。电气和电子工程师协会工业规范IEEE802.11组先后定义了802.11a/b/g/n/ac等一系列标准来满足不断增长的通信需求。其中，动态信道检测门限技术作为提高信道复用率，解决网络效率的一种备选技术，引起了广泛关注和研究。
在常见的WLAN中，可以由一个接入点(AP，Access Point)以及与之相关联的STA组成一个基本服务集(BSS，Basic Service Set)。
隐藏STA是面临的一个典型的亟待解决问题，由于在一个BSS中，并不是所有的STA都能够在其他STA的信号覆盖范围之内，所以当一个STA在向另一个STA发送数据时，其他STA可能不会感知到这一通信过程，即其它STA会成为该STA的隐藏STA，从而产生冲突。举个例子来说，如图1所示，当STA A向STA B传输业务时，由于STA C与STA A互为隐藏STA，而STA C与STA B相互之间可以听到对方，此时若STA C也开始向STA D传输业务就会和STA A所传输业务发生碰撞，造成STA B无法正常接收。
目前检测隐藏STA常用的办法是请求发送/清除发送(RTS/CTS， Request To Send/Clear To Send)保护，然而带来的实现复杂度难以估量。随着系统中站点数目的增多，隐藏STA造成的碰撞问题会越来越显著，因此急需找到一种解决该问题的方法。
发明内容
为解决现有存在的技术问题，本发明实施例提供一种隐藏STA的检测方法、系统、STA及计算机存储介质。
本发明实施例提供了一种隐藏STA的检测方法，应用于源STA，包括：
向目的STA发送第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
上述方案中，所述第二无线帧的个数为一个以上。
上述方案中，所述第一无线帧的物理层信令携带信息指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
上述方案中，所述第二无线帧的传输开始时刻及传输时长由所述第一无线帧的媒体接入控制(MAC，Media Access Control)层信令指示。
上述方案中，收到所述目的STA的反馈帧，且收到的反馈帧指示使用请求发送RTS时，所述方法还包括：
在下一次信道竞争过程中使用RTS。
上述方案中，收到所述目的STA的反馈帧后，所述方法还包括：
确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
本发明实施例还提供了一种隐藏STA的检测方法，应用于目的STA，包括：
接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及 传输时长；
根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
上述方案中，所述方法还包括：
收到所述第一无线帧后，向所述源STA发送反馈帧。
上述方案中，所述根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA之前，所述方法还包括：
将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
上述方案中，所述根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA，包括：
将所述源STA的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
上述方案中，发送的反馈帧包含指示源STA下一次竞争信道时使用RTS的指示信息。
上述方案中，发送的反馈帧包含所述源STA的隐藏STA的识别号和/或地址。
本发明实施例又提供了一种STA，包括：第一接收单元及第一发送单元；其中，
所述第一发送单元，配置为向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且所述第一接收单元未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
上述方案中，所述STA还包括竞争单元；其中，
所述第一接收单元，配置为接收所述目的STA的反馈帧；
所述竞争单元，配置为当收到的反馈帧指示使用RTS时，在下一次信道竞争过程中使用RTS。
上述方案中，所述STA还包括竞争单元；其中，
所述第一接收单元，配置为接收所述目的STA的反馈帧；
所述竞争单元，配置为确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
本发明实施例还提供了一种STA，包括：第二接收单元及检测单元；其中，
所述第二接收单元，配置为接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
所述检测单元，配置为根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
上述方案中，所述STA还包括：第二发送单元，配置为向所述源STA发送反馈帧。
上述方案中，所述检测单元，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
本发明实施例又提供了一种隐藏STA的检测系统，包括：源STA及目 的STA；其中，
所述源STA，配置为向所述目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
所述目的STA，配置为根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
上述方案中，所述目的STA，还配置为收到所述第一无线帧后，向所述源STA发送反馈帧；
相应地，所述源STA，还配置为接收所述目的STA发送的反馈帧。
上述方案中，所述源STA，还配置为当收到的反馈帧指示使用RTS时，在下一次信道竞争过程中使用RTS；或者，还配置为确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
上述方案中，所述目的STA，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
本发明实施例还提供了一种计算机存储介质，所述计算机存储介质包括一组指令，当执行所述指令时，引起至少一个处理器执行上述的源STA侧的隐藏STA的检测方法，或者执行上述的目的STA侧的隐藏STA的检测方法。
本发明实施例提供的隐藏STA的检测方法、系统、STA及计算机存储介质，源STA向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；所述目的STA根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输 参数集，确定所述源STA是否存在隐藏STA，如此，能简单、有效地检测隐藏STA。
附图说明
在附图(其不一定是按比例绘制的)中，相似的附图标记可在不同的视图中描述相似的部件。具有不同字母后缀的相似附图标记可表示相似部件的不同示例。附图以示例而非限制的方式大体示出了本文中所讨论的各个实施例。
图1为相关技术中隐藏STA造成的碰撞问题示意图；
图2为本发明实施例一隐藏STA的检测方法流程示意图；
图3为本发明实施例八一种STA结构示意图；
图4为本发明实施例八另一种STA结构示意图；
图5为本发明实施例八隐藏STA的检测系统结构示意图。
具体实施方式
下面结合附图及实施例本发明再作进一步详细地描述。
在本发明的各种实施例中：源STA向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；所述目的STA根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
实施例一
本实施例提供一种隐藏STA的检测方法，应用于源STA，该方法包括：向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
这里，所述源STA可以是BSS中的STA，相应地，目的STA可以是BSS中的AP；所述源STA也可以是BSS中的AP；相应地，所述目的STA可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至收到所述目的STA的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧，也可以是新无线帧。
其中，所述新无线帧可以是所述源STA针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
当收到所述目的STA的反馈帧，且收到的反馈帧指示使用RTS时，即收到的反馈帧包含指示源STA下一次竞争信道时使用RTS的指示信息时，该方法还包括：
在下一次信道竞争过程中使用RTS。
当收到所述目的STA的反馈帧，且收到的反馈帧包含所述源STA的隐藏STA的识别号和/或地址时，该方法还可以包括：
判断隐藏STA的个数是否高于预设门限，当隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
其中，实际应用时，所述源STA收到所述反馈帧后，会在本地保存，以便确定本地隐藏STA的个数。
具体地，所述源STA根据当前反馈帧包含的隐藏STA的识别号和/或地址(当前反馈帧中携带的隐藏STA信息)及存储在本地的历史反馈帧包含的隐藏STA的识别号和/或地址(历史反馈帧中携带的隐藏STA信息)，来确定本地(自身)隐藏STA的个数。所述预设门限可以根据网络的实际情况来确定。
本实施例还提供另一种隐藏STA的检测方法，应用于目的STA，该方法包括：
接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
其中，所述源STA可以是BSS中的STA，相应地，目的STA可以是BSS中的AP；所述源STA也可以是BSS中的AP；相应地，所述目的STA可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至收到所述目的STA的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧， 也可以是新无线帧。
其中，所述新无线帧可以是所述源STA针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
所述目的STA收到所述第一无线帧后，先解析所述第一无线帧，得到所述第二无线帧的传输开始时刻及传输时长。
在根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA之前，该方法还可以包括：
所述目的STA收到所述第一无线帧后，向所述源STA发送反馈帧，以确认已经收到所述第一无线帧。
其中，发送的反馈帧可以包含指示源STA下一次竞争信道时使用RTS的指示信息。
发送的反馈帧可以包含所述源STA的隐藏STA的识别号和/或地址，以便所述源STA确定隐藏STA的个数。
在根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA之前，该方法还可以包括：
所述目的STA将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
其中，实际应用时，所述目的STA每收到一个隐藏STA检测无线帧后，都会形成一个对应的无线帧传输参数集。
相应地，所述目的STA将所述源STA的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
这里，所述源STA的无线帧传输参数集中的传输开始时刻与所述其它STA的无线帧传输参数集中的传输开始时刻相同时，则不认为所述源STA与所述其它STA互为隐藏STA。
实际应用时，所述目的STA可以采用无线帧传输参数集对应的发送地址来代表对应的源STA。
本实施例第三种隐藏STA的检测方法，如图2所示，包括以下步骤：
步骤201：源STA向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
这里，所述源STA可以是BSS中的STA，相应地，目的STA可以是BSS中的AP；所述源STA也可以是BSS中的AP；相应地，所述目的STA可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至收到所述目的STA的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧， 也可以是新无线帧。
其中，所述新无线帧可以是所述源STA针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
步骤202：所述目的STA根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
这里，所述目的STA收到所述第一无线帧后，先解析所述第一无线帧，得到所述第二无线帧的传输开始时刻及传输时长。
在执行本步骤之前，该方法还可以包括：
所述目的STA收到所述第一无线帧后，向所述源STA发送反馈帧，以确认已经收到所述第一无线帧。
其中，发送的反馈帧可以包含指示源STA下一次竞争信道时使用RTS的指示信息；相应地，所述源STA收到反馈帧后，在下一次信道竞争过程中使用RTS，如此，能有效地减少隐藏STA导致的碰撞问题。
发送的反馈帧可以包含所述源STA的隐藏STA的识别号和/或地址；相应地，所述源STA收到反馈帧后，会在本地保存，以便确定本地隐藏STA的个数。
具体地，所述源STA根据当前反馈帧包含的隐藏STA的识别号和/或地址(当前反馈帧中携带的隐藏STA信息)及存储在本地的历史反馈帧包含的隐藏STA的识别号和/或地址(历史反馈帧中携带的隐藏STA信息)，来确定本地的隐藏STA的个数，并判断本地的隐藏STA的个数是否高于预设 门限，当隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS，如此，能有效地减少隐藏STA导致的碰撞问题。
这里，所述预设门限可以根据网络的实际情况来确定。
在执行本步骤之前，该方法还可以包括：
所述目的STA将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
其中，实际应用时，所述目的STA每收到一个隐藏STA检测无线帧后，都会形成一个对应的无线帧传输参数集。
相应地，所述目的STA将所述源STA的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
这里，所述源STA的无线帧传输参数集中的传输开始时刻与所述其它STA的无线帧传输参数集中的传输开始时刻相同时，则不认为所述源STA与所述其它STA互为隐藏STA。
实际应用时，所述目的STA可以采用无线帧传输参数集对应的发送地址来代表对应的源STA。
本实施例提供的隐藏STA的检测方法，源STA向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；所述目的STA根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA，如此，能简单、有效地检测隐藏STA。
实施例二
本实施例描述通过AP收到STA 1、STA 2两个STA各自的重传帧，判断隐藏STA的过程。
STA 1向AP发送一无线帧(DATA1)完成等待(SIFS，Short InterFrame Space)间隔后，没有收到AP反馈的ACK，STA 1重新竞争信道，并向AP重传DATA1，该重传无线帧记为Rdata1；其中，STA 1在Rdata1中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在Rdata1中通过新的MAC层信令指示了传输DATA1的开始时刻和传输时长；Rdata1和DATA1的传输时长相同，STA 1在Rdata1中持续时长(Duration)域指示的时长和通过新的MAC层信令指示的传输DATA1的传输时长相同。
STA 2向AP发送一无线帧(DATA2)完成等待SIFS间隔后，没有收到AP反馈的ACK，STA 2重新竞争信道，并向AP重传DATA2，该重传无线帧记为Rdata2；其中，STA 2在Rdata2中利用物理层信令域的保留比特信息指示本帧包含传输DATA2的开始时刻和传输时长，并在Rdata2中通过新的MAC层信令指示传输DATA2的开始时间点和传输时长；Rdata2和DATA2的传输时长不同，STA 2在Rdata2中Duration域指示的时长和通过新的MAC层信令指示的DATA2的传输时长不同。
AP接收Rdata1和Rdata2，分别向STA 1和STA 2反馈确认已经收到Rdata1和Rdata2，并根据收到的Rdata1，记录Rdata1对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的Rdata2，记录Rdata2对应的发送方地址、DATA2传输的开始时刻以及传输时长；AP根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例三
本实施例阐述通过AP收到STA 1、STA 2两个STA各自发送的新无线帧，判断隐藏STA的过程，换句话说，STA 1、STA 2在发送的新无线帧中携带上一次传输失败的帧传输时长及开始时刻；相应地，AP通过接收的新无线帧中的这些信息，判断隐藏STA。
STA 1向AP发送一无线帧(DATA1)完成等待SIFS间隔后，没有收到AP反馈的ACK，在下一时刻AP向STA 1发送一新无线帧(DATA)，STA 1收到DATA后，向AP回复ACK；其中，STA 1在ACK中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在ACK中通过新的MAC层信令指示传输DATA1的开始时刻和传输时长。
STA 2向AP发送一无线帧(DATA2)完成等待SIFS间隔后，没有收到AP反馈的ACK，在下一时刻，AP向STA 2发送一新无线帧(data)，STA 2收到data后，向AP回复ACK；其中，STA 2在ACK中利用物理层信令域的保留比特信息指示本帧包含传输DATA2的开始时刻和传输时长，并在ACK中通过新的MAC层信令指示传输DATA2的开始时间点和传输时长；ACK和DATA2的传输时长不同，STA 2在ACK中Duration域指示的时长和通过新的MAC层信令指示的DATA2的传输时长不同。
AP接收STA 1和STA 2返回的ACK，并根据收到的STA 1返回的ACK，记录ACK对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的STA 2返回的ACK，记录ACK对应的发送方地址、DATA2传输的开始时刻以及传输时长；AP根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例四
本实施例阐述站AP收到STA 1、STA 2两个STA各自发送的新无线帧， 判断隐藏STA的过程，换句话说，STA 1、STA 2在发送的新无线帧中携带上一次传输失败的帧传输时长及开始时刻；相应地，AP通过接收的新无线帧中的这些信息，判断隐藏STA。
STA 1向AP发送一无线帧(DATA1)完成等待SIFS间隔后，没有收到AP反馈的ACK，在下一时刻STA 1重新竞争到发送机会，并向AP发送一新无线帧(DATA2)；其中，STA 1在DATA2中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在DATA2中通过新的MAC层信令指示上次传输DATA1的开始时刻和传输时长；DATA2和DATA1的传输时长相同，STA 1在DATA2中Duration域指示的时长和通过新的MAC层信令指示的传输DATA1的传输时长相同。
STA 2向AP发送一无线帧(DATA3)完成等待SIFS间隔后，没有收到AP反馈的ACK，STA 2重新竞争信道，并向AP发送一新无线帧(DATA4)；其中，STA 2在DATA4中利用物理层信令域的保留比特信息指示本帧包含传输DATA3的开始时刻和传输时长，并在DATA4中通过新的MAC层信令指示传输DATA3的开始时间点和传输时长；DATA4和DATA3的传输时长不同，STA 2在DATA4中Duration域指示的时长和通过新的MAC层信令指示的DATA3的传输时长不同。
AP接收DATA2和DATA4，分别向STA 1和STA 2反馈确认已经收到DATA2和DATA4，并根据收到的DATA2，记录DATA2对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的DATA4，记录DATA4对应的发送方地址、DATA3传输的开始时刻以及传输时长；AP根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例五
本实施例阐述两个BSS的STA由于隐藏STA问题产生了碰撞的情况。
STA 1向AP 1发送一无线帧(DATA1)完成等待SIFS间隔后，没有收到AP 1反馈的ACK，STA 1重新竞争信道，并向AP 1重传DATA1，该重传无线帧记为Rdata1；其中，STA 1在Rdata1中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在Rdata1中通过新的MAC层信令指示传输DATA1的开始时刻和传输时长。
STA 2向AP 2发送一无线帧(DATA2)完成等待SIFS间隔后，没有听到AP 2反馈的ACK，STA 2重新竞争信道，并向AP 2重传DATA2，该重传无线帧记为Rdata2；其中，STA 2在Rdata2中利用物理层信令域的保留比特信息指示本帧包含传输DATA2的开始时刻和传输时长，并在Rdata2中通过新的MAC层信令指示传输DATA2的开始时刻和传输时长。
AP 1接收到Rdata1和Rdata2，向STA 1反馈确认已经收到Rdata1，并根据收到的Rdata1，记录Rdata1对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的Rdata2，记录Rdata2对应的发送方地址、DATA2传输的开始时刻以及传输时长；AP 1根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
AP 2接收到Rdata1和Rdata2，向STA 2反馈确认已经收到Rdata2，并根据收到的Rdata1，记录Rdata1对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的Rdata2，记录Rdata2对应的发送方地址、DATA2传输的开始时刻以及传输时长；AP21根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例六
本实施例阐述一个BSS的STA和另一个BSS的AP由于隐藏STA问题产生了碰撞的情况。
STA 1向AP 1发送一无线帧(DATA1)完成等待SIFS间隔后，没有听到AP 1反馈的ACK，STA 1重新竞争信道，并向AP 1重传DATA1，该重传无线帧记为Rdata1；其中，STA 1在Rdata1中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在Rdata1中通过新的MAC层信令指示传输DATA1的开始时刻和传输时长。
AP 2向STA 2发送一无线帧(DATA2)完成等待SIFS间隔后，没有听到STA 2反馈的ACK，AP 2重新竞争信道，并向STA 2重传DATA2，该重传无线帧记为Rdata2；其中，AP 2在Rdata2中利用物理层信令域的保留比特信息指示本帧包含传输DATA2的开始时刻和传输时长，并在Rdata2中通过新的MAC层信令指示传输DATA2的开始时间点和传输时长。
AP 1接收到Rdata1和Rdata2，向STA 1反馈确认已经收到Rdata1，并根据收到的Rdata1，记录Rdata1对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的Rdata2，记录Rdata2对应的发送方地址、DATA2传输的开始时刻以及传输时长；AP 1根据记录的信息发现：STA 1和AP 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
STA 2接收到Rdata1和Rdata2，向AP 2反馈确认已经收到Rdata2，并根据收到的Rdata1，记录Rdata1对应的发送方地址、DATA1传输的开始时刻以及传输时长；根据收到的Rdata2，记录Rdata2对应的发送方地址、DATA2传输的开始时刻以及传输时长；STA 2根据记录的信息发现：STA 1和AP 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例七
本实施例阐述两次传输均失败的情况。
STA 1向AP发送一无线帧(DATA1)完成等待SIFS间隔后，没有听 到AP反馈的ACK，在下一时刻STA 1重新竞争到发送机会，并向AP发送另一无线帧(DATA2)；其中，STA 1在DATA2中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长，并在DATA2中通过新的MAC层信令指示传输DATA1的开始时刻和传输时长。
STA 1发送完DATA2没有收到AP反馈的ACK，在下一时刻STA 1重新竞争到发送机会，并向AP发送第三无线帧(DATA3)；其中，STA 1在DATA3中利用物理层信令域的保留比特信息指示本帧包含传输DATA1的开始时刻和传输时长及传输DATA 2的开始时刻和传输时长，并在DATA3中通过新的MAC层信令指示传输DATA1的开始时刻和传输时长，以及传输DATA2的开始时刻和传输时长。
STA 2向AP发送一无线帧(DATA4)完成等待SIFS间隔后，没有收到AP反馈的ACK，STA 2重新竞争信道，并向AP重传DATA4，该重传无线帧记为Rdata4；其中，STA 2在Rdata4中利用物理层信令域的保留比特信息指示本帧包含传输DATA4的开始时刻和传输时长，并在Rdata4中通过新的MAC层信令指示传输DATA4的开始时间点和传输时长；Rdata4和DATA4的传输时长不同，STA 2在Rdata4中Duration域指示的时长和通过新的MAC层信令指示的DATA4的传输时长不同。
AP接收DATA3和Rdata4，分别向STA 1和STA 2反馈确认已经收到DATA3和Rdata4，并根据收到的DATA3，记录DATA3对应的发送方地址、DATA1传输的开始时刻以及传输时长、DATA2的传输开始时刻及传输时长；根据收到的Rdata4，记录Rdata4对应的发送方地址、DATA4传输的开始时刻以及传输时长；AP根据记录的信息发现：STA 1和STA 2上一次数据传输的时间有交叠，从而判定STA 1和STA 2互为隐藏STA，且由于隐藏STA的问题产生了碰撞。
实施例八
为实现本发明实施例的方法，本实施例提供一种STA，如图3所示，该STA包括：第一接收单元31及第一发送单元32；其中，
所述第一发送单元32，配置为向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且所述第一接收单元31未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
所述STA是指源STA；所述源STA可以是BSS中的STA，相应地，目的STA可以是BSS中的AP；所述源STA也可以是BSS中的AP；相应地，所述目的STA可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至所述第一接收单元31收到所述目的STA的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧，也可以是新无线帧。
其中，所述新无线帧可以是所述源STA针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
该STA还可以包括：竞争单元；其中，
第一接收单元31，配置为接收所述目的STA的反馈帧；
所述竞争单元，配置为当收到的反馈帧指示使用RTS时，即收到的反 馈帧包含指示源STA下一次竞争信道时使用RTS的指示信息时，在下一次信道竞争过程中使用RTS。
这里，所述竞争单元，配置为收到的反馈帧包含所述源STA的隐藏STA的识别号和/或地址时，判断隐藏STA的个数是否高于预设门限，当隐藏STA的个数高于预设门限时时，在下一次信道竞争过程中使用RTS。
其中，实际应用时，所述竞争单元会在本地保存所述反馈帧，以便确定本地隐藏STA的个数。
具体地，所述竞争单元根据当前反馈帧包含的隐藏STA的识别号和/或地址(所述反馈帧中携带的隐藏STA信息)及存储在本地的历史反馈帧包含的隐藏STA的识别号和/或地址(历史反馈帧中携带的隐藏STA信息)，来确定本地(自身)隐藏STA的个数。所述预设门限可以根据网络的实际情况来确定。
实际应用时，所述第一接收单元31可由STA中的接收机实现；所述第一发送单元32可由STA中的发射机实现；所述竞争单元可由STA中的央处理器(CPU，Central Processing Unit)、微处理器(MCU，Micro Control Unit)、数字信号处理器(DSP，Digital Signal Processor)或可编程逻辑阵列(FPGA，Field－Programmable Gate Array)结合收发机实现。
为实现本发明实施例的方法，本实施例还提供了另一种STA，是指目的STA；如图4所示，该STA包括：第二接收单元41及检测单元42；其中，
所述第二接收单元41，配置为接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
所述检测单元42，配置为根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参 数集，确定所述源STA是否存在隐藏STA。
其中，所述源STA可以是BSS中的STA，相应地，目的STA可以是BSS中的AP；所述源STA也可以是BSS中的AP；相应地，所述目的STA可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至收到所述目的STA的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧，也可以是新无线帧。
其中，所述新无线帧可以是所述源STA针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
所述检测单元42收到所述第一无线帧后，先解析所述第一无线帧，得到所述第二无线帧的传输开始时刻及传输时长。
该STA还可以包括：第二发送单元，配置为向所述源STA发送反馈帧，以确认已经收到所述第一无线帧。
其中，发送的反馈帧可以包含指示源STA下一次竞争信道时使用RTS的指示信息。
发送的反馈帧可以包含所述源STA的隐藏STA的识别号和/或地址，以 便所述源STA确定隐藏STA的个数。
所述检测单元42，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
其中，实际应用时，所述目的STA每收到一个隐藏STA检测无线帧后，都会形成一个对应的无线帧传输参数集。
所述检测单元42，具体配置为将所述源STA的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
这里，所述源STA的无线帧传输参数集中的传输开始时刻与所述其它STA的无线帧传输参数集中的传输开始时刻相同时，则不认为所述源STA与所述其它STA互为隐藏STA。
实际应用时，所述检测单元42可以采用无线帧传输参数集对应的发送地址来代表对应的源STA。
实际应用时，所述第二接收单元41可由STA中的接收机实现；所述检测单元42可由STA中的CPU、MCU、DSP或FPGA实现；所述第二发送单元可由STA的发射机实现。
为实现本发明实施例的方法，本实施例还提供一种隐藏STA的检测系统，如图5所示，该系统包括：源STA 51及目的STA 52；其中，
所述源STA 51，配置为向所述目的STA 52发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA 52反馈帧的第二无线帧的传输开始时刻及传输时长；
所述目的STA 52，配置为根据所述第一无线帧中携带的所述第二无线 帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA 51是否存在隐藏STA。
其中，所述源STA 51可以是BSS中的STA，相应地，所述目的STA 52可以是BSS中的AP；所述源STA 51也可以是BSS中的AP；相应地，所述目的STA 52可以是BSS中的STA。
所述第二无线帧的个数可以是一个以上。具体地，举个例子来说，假设第二无线帧的个数为N个，则所述第一无线帧携带N个第二无线帧的传输开始时刻及传输时长；直至收到所述目的STA 52的反馈帧为止，这N个第二无线帧可以称为隐藏STA检测无线帧。
实际应用时，所述第一无线帧和所述第二无线帧携带的数据可以相同也可以不同；所述第一无线帧和所述第二无线帧所采用的调制方式、带宽可以相同也可以不同。所述第一无线帧可以是所述第二无线帧的重传帧，也可以是新无线帧。
其中，所述新无线帧可以是所述源STA 51针对收到的无线帧所发送的反馈帧；也可以是一个全新的无线帧。
实际应用时，所述第一无线帧的物理层信令携带信息可以指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
实际应用时，所述第二无线帧的传输开始时刻及传输时长可以由所述第一无线帧的MAC层信令指示。
所述目的STA 52收到所述第一无线帧后，先解析所述第一无线帧，得到所述第二无线帧的传输开始时刻及传输时长。
所述目的STA 52，还配置为收到所述第一无线帧后，向所述源STA 51发送反馈帧，以确认已经收到所述第一无线帧；
相应地，所述源STA 51，还配置为接收所述目的STA 52发送的反馈帧。
其中，发送的反馈帧可以包含指示源STA下一次竞争信道时使用RTS 的指示信息；相应地，所述源STA51，还配置为收到反馈帧后，在下一次信道竞争过程中使用RTS，如此，能有效地减少隐藏STA导致的碰撞问题。
发送的反馈帧可以包含所述源STA的隐藏STA的识别号和/或地址；相应地，所述源STA 51收到反馈帧后，会在本地保存，以便确定本地隐藏STA的个数。
具体地，所述源STA 51，还配置为收到反馈帧后，根据当前反馈帧包含的隐藏STA的识别号和/或地址(当前反馈帧中携带的隐藏STA信息)及存储在本地的历史反馈帧包含的隐藏STA的识别号和/或地址(历史反馈帧中携带的隐藏STA信息)，来确定本地的隐藏STA的个数，并判断本地的隐藏STA的个数是否高于预设门限，当隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS，如此，能有效地减少隐藏STA导致的碰撞问题。
这里，所述预设门限可以根据网络的实际情况来确定。
所述目的STA 52，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
其中，实际应用时，所述目的STA 52每收到一个隐藏STA检测无线帧后，都会形成一个对应的无线帧传输参数集。
相应地，所述目的STA 52，具体配置为：将所述源STA 51的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA 51的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA 51与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
这里，所述源STA的无线帧传输参数集中的传输开始时刻与所述其它STA的无线帧传输参数集中的传输开始时刻相同时，则不认为所述源STA 与所述其它STA互为隐藏STA。
实际应用时，所述目的STA 52可以采用无线帧传输参数集对应的发送地址来代表对应的源STA。
本实施例提供的隐藏STA的检测系统，源STA 51向目的STA 52发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA 52反馈帧的第二无线帧的传输开始时刻及传输时长；所述目的STA 52根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA 51是否存在隐藏STA，如此，能简单、有效地检测隐藏STA。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个 流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
基于此，本发明实施例还提供了一种计算机存储介质，所述计算机存储介质包括一组指令，当执行所述指令时，引起至少一个处理器执行上述的源STA侧的隐藏STA的检测方法，或者执行上述的目的STA侧的隐藏STA的检测方法。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (27)

  1. 一种隐藏站点STA的检测方法，应用于源STA，所述方法包括：
    向目的STA发送第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
  2. 根据权利要求1所述的方法，其中，所述第二无线帧的个数为一个以上。
  3. 根据权利要求1所述的方法，其中，所述第一无线帧的物理层信令携带信息指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
  4. 根据权利要求1所述的方法，其中，所述第二无线帧的传输开始时刻及传输时长由所述第一无线帧的媒体接入控制MAC层信令指示。
  5. 根据权利要求1所述的方法，其中，收到所述目的STA的反馈帧，且收到的反馈帧指示使用请求发送RTS时，所述方法还包括：
    在下一次信道竞争过程中使用RTS。
  6. 根据权利要求1所述的方法，其中，收到所述目的STA的反馈帧后，所述方法还包括：
    确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
  7. 一种隐藏STA的检测方法，应用于目的STA，所述方法包括：
    接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
    根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是 否存在隐藏STA。
  8. 根据权利要求7所述的方法，其中，所述第二无线帧的个数为一个以上。
  9. 根据权利要求7所述的方法，其中，所述第一无线帧的物理层信令携带信息指示所述第一无线帧包含所述第二无线帧的传输开始时刻及传输时长。
  10. 根据权利要求7所述的方法，其中，所述第二无线帧的传输开始时刻及传输时长由所述第一无线帧的MAC层信令指示。
  11. 根据权利要求7所述的方法，其中，所述方法还包括：
    收到所述第一无线帧后，向所述源STA发送反馈帧。
  12. 根据权利要求7所述的方法，其中，所述根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA之前，所述方法还包括：
    将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
  13. 根据权利要求12所述的方法，其中，所述根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA，包括：
    将所述源STA的无线帧传输参数集，与本地存储的其它STA的无线帧传输参数集进行对比，确定所述源STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段与所述其它STA的无线帧传输参数集中的传输开始时刻及传输时长所覆盖的时间段有交叠时，确定所述源STA与传输开始时刻及传输时长所覆盖的时间段有交叠的其它STA互为隐藏STA。
  14. 根据权利要求11所述的方法，其中，发送的反馈帧包含指示源STA 下一次竞争信道时使用RTS的指示信息。
  15. 根据权利要求11所述的方法，其中，发送的反馈帧包含所述源STA的隐藏STA的识别号和/或地址。
  16. 一种STA，所述STA包括：第一接收单元及第一发送单元；其中，
    所述第一发送单元，配置为向目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且所述第一接收单元未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长。
  17. 根据权利要求16所述的STA，其中，所述第二无线帧的个数为一个以上。
  18. 根据权利要求16所述的STA，其中，所述STA还包括竞争单元；其中，
    所述第一接收单元，配置为接收所述目的STA的反馈帧；
    所述竞争单元，配置为当收到的反馈帧指示使用RTS时，在下一次信道竞争过程中使用RTS。
  19. 根据权利要求16所述的STA，其中，所述STA还包括竞争单元；其中，
    所述第一接收单元，配置为接收所述目的STA的反馈帧；
    所述竞争单元，配置为确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
  20. 一种STA，所述STA包括：第二接收单元及检测单元；其中，
    所述第二接收单元，配置为接收源STA发送的第一无线帧；所述第一无线帧携带所述第一无线帧之前发送的且未收到目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
    所述检测单元，配置为根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数 集，确定所述源STA是否存在隐藏STA。
  21. 根据权利要求20所述的STA，其中，所述STA还包括：第二发送单元，配置为向所述源STA发送反馈帧。
  22. 根据权利要求20所述的STA，其中，所述检测单元，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
  23. 一种隐藏STA的检测系统，所述系统包括：源STA及目的STA；其中，
    所述源STA，配置为向所述目的STA发送第一无线帧，所述第一无线帧携带所述第一无线帧之前发送的且未收到所述目的STA反馈帧的第二无线帧的传输开始时刻及传输时长；
    所述目的STA，配置为根据所述第一无线帧中携带的所述第二无线帧的传输开始时刻及传输时长、以及本地保存的其它STA的无线帧传输参数集，确定所述源STA是否存在隐藏STA。
  24. 根据权利要求23所述的系统，其中，所述目的STA，还配置为收到所述第一无线帧后，向所述源STA发送反馈帧；
    相应地，所述源STA，还配置为接收所述目的STA发送的反馈帧。
  25. 根据权利要求24所述的系统，其中，所述源STA，还配置为当收到的反馈帧指示使用RTS时，在下一次信道竞争过程中使用RTS；或者，还配置为确定隐藏STA的个数高于预设门限时，在下一次信道竞争过程中使用RTS。
  26. 根据权利要求23所述的系统，其中，所述目的STA，还配置为将所述第二无线帧的传输开始时刻及传输时长、对应的发送地址作为所述源STA的无线帧传输参数集，在本地存储。
  27. 一种计算机存储介质，所述计算机存储介质包括一组指令，当执 行所述指令时，引起至少一个处理器执行如权利要求1至6任一项所述的隐藏STA的检测方法，或者执行如权利要求7至15任一项所述的隐藏STA的检测方法。
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