WO2017050137A1 - 一种多用户传输网络分配矢量设置方法和装置 - Google Patents

一种多用户传输网络分配矢量设置方法和装置 Download PDF

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Publication number
WO2017050137A1
WO2017050137A1 PCT/CN2016/098457 CN2016098457W WO2017050137A1 WO 2017050137 A1 WO2017050137 A1 WO 2017050137A1 CN 2016098457 W CN2016098457 W CN 2016098457W WO 2017050137 A1 WO2017050137 A1 WO 2017050137A1
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Prior art keywords
station
multicast frame
allocation vector
network allocation
frame
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PCT/CN2016/098457
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English (en)
French (fr)
Inventor
邢卫民
吕开颖
孙波
田开波
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中兴通讯股份有限公司
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Priority to US15/762,318 priority Critical patent/US10506637B2/en
Publication of WO2017050137A1 publication Critical patent/WO2017050137A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • 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 communications, and in particular, to a multi-user transmission network allocation vector setting method and apparatus.
  • a basic service set (BSS) of a WLAN is generally as shown in FIG. 1 and generally includes an access point (AP) and multiple non-AP sites. (non-AP station).
  • AP access point
  • non-AP station non-AP station
  • a shared medium wireless network in particular a wireless local area network (WLAN)
  • WLAN uses a carrier detection technology to determine whether a channel is occupied or not, and generally uses a carrier detection technology to determine whether a channel is occupied or not.
  • the carrier detection technology can be classified into two types. Two types: physical carrier detection and virtual carrier detection. Physical carrier detection means that the radio channel is monitored to determine whether the received energy exceeds a certain threshold. If the threshold is exceeded, the channel is considered to be occupied.
  • the virtual carrier detection means that the transmitting and receiving parties transmit the radio frame, and the radio frame carries the subsequent transmission and needs to be reserved.
  • the channel time (Duration) other stations maintain a network allocation vector (NAV) according to the received reservation time. If the NAV of the station is not 0, the station does not contend for the channel.
  • the WLAN also defines other virtual carrier detection mechanisms, such as response indication deferral (RID), or a mechanism for maintaining channel reservation occupation time according to the time indication in the physical layer signaling.
  • RID response indication deferral
  • a radio frame for multi-user transmission such as a multi-user request to send (MU-RTS), a trigger frame (TR, Trigger Frame), and a broadcast frame. And these broadcast frames require multiple destination sites to respond, unlike traditional broadcast frames.
  • MU-RTS multi-user request to send
  • TR Trigger Frame
  • broadcast frame require multiple destination sites to respond, unlike traditional broadcast frames.
  • the NAV setting rule of the destination station Upon receiving a radio frame for multi-user transmission, such as MU-RTS, the NAV setting rule of the destination station conflicts with the determination of whether or not to respond, and a new virtual carrier update rule needs to be designed.
  • the traditional device can only parse a part of the new radio frame for multi-user transmission.
  • the current virtual carrier detection rule will cause the new device and the traditional device to be unfair when competing. It is necessary to avoid the use of greedy rules by the new device to affect the tradition.
  • the transmission of the device is necessary to avoid the use of greedy rules by the new device to affect the tradition.
  • virtual carrier detection is still a basic technology used by WLAN, but for the wireless frames designed for multi-user transmission, many of the original rules are no longer applicable, and new virtual carrier detection updates need to be designed. Reset the rules to ensure that new and old devices can coexist better.
  • the embodiment of the invention provides a multi-user transmission network allocation vector setting method and device for the problem of virtual carrier detection in parallel multi-user data transmission.
  • a multi-user transmission network allocation vector setting method includes:
  • the first station receives the multicast frame requesting the response, and determines that the first site is a destination site that requires a response;
  • the first station determines a channel state using a value of a network allocation vector that is not updated by the multicast frame.
  • the method further includes:
  • the first station updates the network allocation vector by using the subscription duration information carried by the multicast frame.
  • the first station uses the subscription duration carried by the multicast frame.
  • the information update network allocation vector includes:
  • the value of the current network allocation vector is maintained.
  • the updating, by the first station, the network allocation vector by using the subscription duration information carried by the multicast frame includes:
  • the network allocation vector that is not updated by the multicast frame refers to a network allocation vector corresponding to a network where the first station is located.
  • the method further includes:
  • the first station When it is determined that the channel state is idle, the first station sends a response frame to respond to the multicast frame.
  • the response frame is a clear transmission frame CTS or a radio frame conforming to an uplink multi-user radio frame format.
  • determining that the channel state is idle includes:
  • the value of the network allocation vector that is not updated by the multicast frame is a first preset value, or
  • the network allocation vector that is not updated by the multicast frame is a value other than the first preset value, and the transmission opportunity holder corresponding to the network allocation vector of the value other than the first preset value It is consistent with the transmission address of the multicast frame.
  • the multicast frame requiring the response includes: a multi-user requesting to transmit a MU-RTS frame, triggering a Trigger frame, using multiple frames transmitted in a parallel multi-user manner, or receiving a wireless address at a broadcast or multicast address. frame.
  • another embodiment of the present invention further provides a multi-user transmission network allocation vector setting method, including:
  • the second station receives the multicast frame requesting the response, and determines that the second site is a site that does not require a response;
  • the second station updates the network allocation vector by using the subscription duration information carried by the multicast frame
  • the second station When the second station determines that the transmission opportunity initiated by the multicast frame fails, the second station contends for a transmission opportunity, and the contention transmission opportunity is within the failed transmission opportunity.
  • the second station determines that the second station and the station that sends the multicast frame are The status meets the update criteria.
  • the determining, by the second station, that the status of the second station and the station that sends the multicast frame meets the update condition includes:
  • the second station belongs to the same network as the station that sends the multicast frame; or the second station does not belong to the same network as the station that sends the multicast frame, and the received signal strength of the multicast frame is greater than
  • the threshold TH determines that the status of the second station and the station that sends the multicast frame meets the update condition.
  • the determining, by the second station, that the transmission opportunity initiated by the multicast frame fails includes:
  • the second site does not generate a reception start indication or a valid physical frame header is not detected; or the time T after the end of the multicast frame, the second If the signal strength detected by the station is lower than the threshold TH, it is determined that the transmission opportunity initiated by the multicast frame fails.
  • the method further includes:
  • the second station resets a network allocation vector updated by the reservation duration information carried in the multicast frame as a preset parameter.
  • the second station determines a transmission opportunity initiated by the multicast frame. After the failure includes:
  • the current backoff process of the second site is suspended and a new backoff process is initiated.
  • the competing transmission opportunity includes within the failed transmission opportunity:
  • the method further includes: the second station recovering the suspended backoff process.
  • the new backoff procedure uses a contention backoff parameter, wherein the contention backoff parameter includes one or more of the following: a contention window, an interframe space, and a detected time slot length.
  • another embodiment of the present invention further provides a multi-user transmission network allocation vector setting apparatus, including:
  • a first determining module configured to receive a multicast frame that requires a response, and determine that the first site is a destination site that requires a response;
  • the first vector module is configured to determine a channel state using a value of a network allocation vector that is not updated by the multicast frame.
  • the device further includes:
  • the update module is configured to update the network allocation vector by using the reservation duration information carried by the multicast frame.
  • the update module includes:
  • a first setting unit configured to set a network allocation vector to a value of the reserved duration information when determining that the channel state is idle;
  • a second setting unit configured to: when determining that the channel state is busy, setting a network allocation vector according to a larger value of a value of a current network allocation vector and a value of the reserved duration; or
  • the third setting unit is configured to maintain the value of the current network allocation vector when it is determined that the channel state is busy.
  • the update module includes:
  • a first update unit configured to update a network allocation vector corresponding to the network where the first station is located
  • the network allocation vector that is not updated by the multicast frame refers to a network allocation vector corresponding to a network where the first station is located.
  • the device further includes:
  • the response module when determining that the channel state is idle, the first station sends a response frame to respond to the multicast frame.
  • the first setting unit determines that the channel status is idle:
  • the value of the network allocation vector that is not updated by the multicast frame is a first preset value, or
  • the network allocation vector that is not updated by the multicast frame is a value other than the first preset value, and the transmission opportunity holder corresponding to the network allocation vector of the value other than the first preset value It is consistent with the transmission address of the multicast frame.
  • another embodiment of the present invention further provides a multi-user transmission network allocation vector setting apparatus, including:
  • a second determining module configured to receive a multicast frame that requires a response, and determine that the second site is a listening site that does not require a response;
  • a second vector module configured to update a network allocation vector by using the subscription duration information carried by the multicast frame
  • a competition module configured to: when the second station determines that the transmission opportunity initiated by the multicast frame fails, the second station contends for a transmission opportunity, and the contention transmission opportunity is within the failed transmission opportunity.
  • the apparatus further includes: a condition module, configured to determine that the status of the second station and the station that sends the multicast frame meets an update condition.
  • condition module determines the second station and sends the group The status of the broadcasted site meets the update condition means:
  • the second station belongs to the same network as the station that sends the multicast frame; or the second station does not belong to the same network as the station that sends the multicast frame, and the received signal strength of the multicast frame is greater than
  • the threshold TH determines that the status of the second station and the station that sends the multicast frame meets the update condition.
  • the contention module determines that the transmission opportunity initiated by the multicast frame fails:
  • the second site does not generate a reception start indication or a valid physical frame header is not detected; or the time T after the end of the multicast frame, the second If the signal strength detected by the station is lower than the threshold TH, it is determined that the transmission opportunity initiated by the multicast frame fails.
  • the device further includes: a vector resetting module, configured to reset a network allocation vector of the reservation duration information carried by the multicast frame as a preset parameter.
  • the apparatus further includes: a backoff module, configured to: suspend the current backoff process of the second site, and initiate a new backoff process.
  • the backoff module is further configured to: the second station resumes the suspended backoff process.
  • a computer storage medium is further provided, and the computer storage medium may store an execution instruction for performing the implementation of the multi-user transmission network allocation vector setting method in the foregoing embodiment.
  • the invention has the following beneficial effects:
  • the WLAN station receives the radio frame transmitted by multiple users, especially when controlling the frame, and updates and resets the NAV mechanism, so that the purpose of the multi-user radio frame can be
  • the station can accurately determine the channel condition and correctly respond to the multi-user radio frame.
  • the observing station can use the released resources and avoid affecting the traditional device when it learns that the transmission opportunity triggered by the multi-user radio frame fails or is available.
  • the competition channel guarantees a certain fairness and can be applied to multi-user transmission.
  • the setting and resetting of network allocation vectors in the process can improve network efficiency.
  • FIG. 1 is a diagram showing an example of a WLAN basic service set in the prior art
  • FIG. 2 is a flowchart of a multi-user transmission network allocation vector setting method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a multi-user transmission network allocation vector setting apparatus according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a multi-user transmission network allocation vector setting method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a multi-user transmission network allocation vector setting apparatus according to an embodiment of the present invention.
  • FIG. 6 is a diagram showing an example of a processing flow of a destination station of a MU-RTS frame according to Embodiment 1 of the present invention
  • FIG. 7 is a diagram showing an example of a processing flow of a destination site of a Trigger frame according to Embodiment 2 of the present invention.
  • FIG. 8 is a diagram showing an example of a plurality of virtual carrier timer processes according to Embodiment 3 of the present invention.
  • FIG. 9 is a diagram showing an example of a processing flow of a bypass station of a MU-RTS frame according to Embodiment 4 of the present invention.
  • an embodiment of the present invention provides a multi-user transmission network allocation vector setting method, including:
  • the first station receives a multicast frame that requires a response, and determines that the first site is a destination site that requires a response;
  • the first station uses a value of a network allocation vector that is not updated by the multicast frame. Break channel status.
  • step S101 after receiving the multicast frame requesting the response, the first station needs to determine that the first station is the destination station that is required to respond.
  • step S102 the method further includes:
  • S103 The first station updates the network allocation vector by using the subscription duration information carried by the multicast frame.
  • Step S103 includes:
  • the value of the current network allocation vector is maintained.
  • Step S103 includes:
  • the network allocation vector that is not updated by the multicast frame refers to a network allocation vector corresponding to a network where the first station is located.
  • step S103 the method further includes:
  • the first station When it is determined that the channel status is idle, the first station sends a response frame to respond to the multicast frame.
  • the response frame is a clear to send frame CTS (clear to send) or a radio frame conforming to an uplink multi-user radio frame format.
  • Determining that the channel state is idle includes:
  • the value of the network allocation vector that is not updated by the multicast frame is a first preset value, or
  • the network allocation vector that is not updated by the multicast frame is a value other than the first preset value, and the transmission opportunity holder corresponding to the network allocation vector of the value other than the first preset value versus The sending addresses of the multicast frames are the same.
  • the first preset value is 0 in the embodiment of the present invention.
  • the multicast frame requesting response includes: a multi-user requesting to transmit a MU-RTS frame, triggering a Trigger frame, multiple frames transmitted using a parallel multi-user mode, or receiving a radio frame whose address is a broadcast or multicast address.
  • an embodiment of the present invention provides a multi-user transmission network allocation vector setting method, including:
  • the second station receives the multicast frame that requires the response, and determines that the second site is a site that does not require a response.
  • the second station updates the network allocation vector by using the subscription duration information carried by the multicast frame.
  • step S201 after the second station receives the multicast frame requesting the response, the second station needs to be a listening site that is not required to respond.
  • step S202 the method further includes:
  • the second station determines that the transmission opportunity initiated by the multicast frame fails, the second station contends for a transmission opportunity, and the contention transmission opportunity is within the failed transmission opportunity.
  • the method includes:
  • the second station determines that the status of the second station and the station that sends the multicast frame meets an update condition.
  • Step S210 includes:
  • the second station belongs to the same network as the station that sends the multicast frame; or the second station does not belong to the same network as the station that sends the multicast frame, and the received signal strength of the multicast frame is greater than
  • the threshold TH determines that the status of the second station and the station that sends the multicast frame meets the update condition.
  • the determining, by the second station, that the transmission opportunity initiated by the multicast frame fails in step S203 includes:
  • the second site does not generate a reception start indication or a valid physical frame header is not detected; or the time T after the end of the multicast frame, the second If the signal strength detected by the station is lower than the threshold TH, it is determined that the transmission opportunity initiated by the multicast frame fails.
  • the second station After the second station determines that the transmission opportunity initiated by the multicast frame fails, the second station further includes:
  • the second station resets a network allocation vector updated by the reservation duration information carried in the multicast frame as a preset parameter.
  • the time T may be a transmission time of the response frame of the multicast frame plus one or more interframe time, plus one or more detection time slots, plus Receive delay time.
  • the preset parameter is 0.
  • Step S203 After determining that the transmission opportunity initiated by the multicast frame fails, the method includes:
  • the current backoff process of the second site is suspended and a new backoff process is initiated.
  • the competition process is consistent with the current wifi competition process, which is a CSMA (Carrier Sense Multiple Access) mechanism.
  • the suspended time is a time when the multicast frame is detected or a time when the transmission opportunity initiated by the multicast frame is determined.
  • the moment when the new backoff procedure is started is the timing of determining the failure of the transmission opportunity initiated by the multicast frame.
  • the new backoff procedure uses a new contention backoff parameter, wherein the new contention backoff parameter includes parameters such as a new contention window, a new interframe space, a new detected time slot length, and the like.
  • the contention transmission opportunity in step S203 includes within the failed transmission opportunity:
  • the method further includes: the second station recovering the suspended backoff process. It can also be understood here that the recovery process of suspending the second site is resumed.
  • the recovery suspension is a time when the time indicated by the network allocation vector of the reservation duration information update carried by the multicast frame expires.
  • the recovery backoff process is the above-mentioned suspension of the competition backoff process.
  • a multicast frame In the current wifi protocol, a multicast frame generally has no response frame.
  • the multicast frame involved in the embodiment of the present invention is a multicast frame that requires a response, that is, after the AP sends the multicast address frame, there are one or more sites.
  • a response frame is sent, and the identity of the one or more sites is carried in the frame body of the multicast frame.
  • the first site is a site with its identifier in the frame body, and the second site is a site in the multicast frame without its identifier.
  • the received multicast frame is required to be responsive.
  • the first site is the responding site, that is, the destination site, and the second site is the listening site, that is, the site that does not respond.
  • an embodiment of the present invention provides a multi-user transmission network allocation vector setting apparatus, which is disposed at a first site, and includes:
  • a first determining module configured to receive a multicast frame that requires a response, and determine that the first site is a destination site that requires a response;
  • the first vector module is configured to determine a channel state using a value of a network allocation vector that is not updated by the multicast frame.
  • the device also includes:
  • the update module is configured to update the network allocation vector by using the reservation duration information carried by the multicast frame.
  • the update module includes:
  • a first setting unit configured to set a network allocation vector to a value of the reserved duration information when determining that the channel state is idle;
  • a second setting unit configured to: when determining that the channel state is busy, setting a network allocation vector according to a larger value of a value of a current network allocation vector and a value of the reserved duration; or
  • the third setting unit is configured to maintain the value of the current network allocation vector when it is determined that the channel state is busy.
  • the update module includes:
  • a first update unit configured to update a network allocation vector corresponding to the network where the first station is located
  • the network allocation vector that is not updated by the multicast frame refers to a network allocation vector corresponding to a network where the first station is located.
  • the device further includes:
  • the response module sends a response frame to the multicast frame when it is determined that the channel state is idle.
  • the first setting unit determining that the channel status is idle means:
  • the value of the network allocation vector that is not updated by the multicast frame is a first preset value, or
  • the network allocation vector that is not updated by the multicast frame is a value other than the first preset value, and the transmission opportunity holder corresponding to the network allocation vector of the value other than the first preset value It is consistent with the transmission address of the multicast frame.
  • an embodiment of the present invention provides a multi-user transmission network allocation vector setting apparatus, which is disposed at a second site, and includes:
  • a second determining module configured to receive a multicast frame that requires a response, and determine that the second site is a listening site that does not require a response;
  • a second vector module configured to update a network allocation vector by using the subscription duration information carried by the multicast frame
  • a contention module configured to compete for a transmission opportunity when the second station determines that the transmission opportunity initiated by the multicast frame fails, and the contention transmission opportunity is within the failed transmission opportunity.
  • the apparatus further includes: a condition module, configured to determine that the status of the second station and the station that sends the multicast frame meets an update condition.
  • the condition module determines that the status of the second station and the station that sends the multicast frame meets the update condition, that is:
  • the second station belongs to the same network as the station that sends the multicast frame; or the second station does not belong to the same network as the station that sends the multicast frame, and the received signal strength of the multicast frame is greater than
  • the threshold TH determines that the status of the second station and the station that sends the multicast frame meets the update condition.
  • the competition module determines that the transmission opportunity initiated by the multicast frame fails:
  • the second site does not generate a reception start indication or a valid physical frame header is not detected; or the time T after the end of the multicast frame, the second If the signal strength detected by the station is lower than the threshold TH, it is determined that the transmission opportunity initiated by the multicast frame fails.
  • the device further includes: a vector resetting module, configured to reset a network allocation vector updated by the reserved duration information carried by the multicast frame as a preset parameter.
  • the apparatus also includes a backoff module configured to suspend a current backoff procedure of the second station and initiate a new backoff procedure.
  • the backoff module is further configured to: the second station resumes the suspended backoff process.
  • the AP sends a MU-RTS frame whose receiving address is a broadcast address, where the frame carries the station identifiers of STA1 to STA4, and requests STA1 to STA4 to respond.
  • STA1 Take STA1 as an example.
  • the receiving process is as follows. The operations of STA2 to STA4 are similar to STA1:
  • STA1 receives the MU-RTS frame and finds that the sender address is the MAC address of the AP associated with itself or other identifier of the associated AP, and STA1 detects that the MU-RTS frame contains its own identifier and sends the CTS frame by itself. Respond to the MU-RTS frame.
  • the receiving address of the MU-RTS frame is a broadcast address, and carries a reservation duration duration information, where the broadcast address is not equal to the address of the STA1, and the STA1 checks the NAV timer that is not updated by the MU-RTS Duration before updating the NAV according to the Duration. If the timer indicates that the channel is idle, STA1 sends a CTS to the AP. If the timer indicates that the channel is busy, STA1 does not reply to the CTS.
  • the process further includes: viewing the NAV timer that is not updated by the MU-RTS Duration, and determining that the channel is busy after the idle, if the timer indicates that the channel is idle, updating the NAV timer by using the Duration value of the MU-RTS; The timer indicates that the channel is busy, then the NAV meter is maintained. The value of the timer ignores the Duration value of the MU-RTS.
  • the use of the value of the NAV timer to determine that the busy is idle means that when the value of the timer is 0, or the value of the timer is non-zero, but the channel time or opportunity holder corresponding to the timer When it is the sender of the MU-RTS, the channel is considered to be idle, otherwise the channel is busy.
  • broadcast frame in this embodiment may also be another multicast frame that requires a reply, such as a Trigger frame.
  • the AP sends a Trigger frame whose receiving address is a broadcast address, where the frame carries the station identifiers of STA1 to STA4, and requires STA1 to STA4 to perform uplink data transmission.
  • the receiving process is as follows and as shown in Figure 7:
  • the STA1 receives the Trigger frame and finds that the sender address is the MAC address of the AP associated with itself or other identifier of the associated AP (for example, the AP has multiple basic service set identifiers (BSSIDs), and the sender address can be multiple.
  • BSSIDs basic service set identifiers
  • the receiving address of the Trigger frame is a broadcast address, and carries a reservation duration duration information, where the broadcast address is not equal to the address of the STA1, and the STA1 checks the NAV timer that is not updated by the Trigger's Duration before updating the NAV according to the Duration, if the timing is If the indicator indicates that the channel is idle, STA1 sends an uplink frame to the AP. If the timer indicates that the channel is busy, STA1 may not reply to the uplink frame. In addition, if the timer indicates that the channel is busy, STA1 may determine whether to reply to the uplink frame according to other conditions. For example, when the reply frame is a response frame or a short frame, the station may ignore the channel busy state and reply to the uplink frame.
  • the process further includes: checking a NAV timer that is not updated by the Trigger's Duration, and determining that the channel is busy after the idle channel, if the timer indicates that the channel is idle, updating the NAV timer by using a Trigger Duration value; if the timer indicates If the channel is busy, compare the value of the current NAV timer with the Duration value of the Trigger frame. If the value of the Duration is greater than the NAV timer. The value of the value of the Trigger frame is used to update the value of the NAV timer.
  • the broadcast frame in this embodiment may also be another multicast frame that requires reply, such as a MU-RTS frame.
  • the site supports multiple NAV timers or supports multiple virtual carrier detection timers. It is assumed that the site supports two NAV timers, and one timer records the basic service set associated with the site (BSS, basic service set). The virtual carrier detection result of the other, and the virtual carrier detection result of the other overlapping basic service set (OBSS) is recorded.
  • the AP sends a MU-RTS frame whose receiving address is a broadcast address, where the frame carries the station identifiers of STA1 to STA4, and requests STA1 to STA4 to respond. Taking STA1 as an example, the processing is as follows and as shown in Figure 8:
  • STA1 receives the MU-RTS frame, finds that the sender address is the MAC address of the AP associated with it, and STA1 detects that the MU-RTS frame contains its own identifier, and sends a CTS frame to respond to the MU-RTS frame.
  • the receiving address of the MU-RTS frame is a broadcast address, and carries the reservation duration duration information, where the broadcast address is not equal to the address of the STA1, but the sending address is the address of the associated AP, and the STA1 updates the NAV timer corresponding to the BSS according to the Duration. And viewing the NAV timer corresponding to the OBSS that is not updated by the MU-RTS Duration. If the OBSS timer indicates that the channel is idle, STA1 sends a CTS to the AP. If the OBSS timer indicates that the channel is busy, STA1 does not reply to the CTS.
  • updating the NAV timer of the associated BSS by using the Duration value of the MU-RTS means that the value of the BSS NAV timer is set using the value of the Duration, regardless of the magnitude between the value of the Duration and the value of the current BSS NAV.
  • the value of Duration is compared with the value of the current BSS NAV, and if the value of Duration is large, the NAV is updated, otherwise it is not updated.
  • This embodiment describes the operation of resetting the NAV by the listening site. It is assumed that there are multiple types of WLAN devices in one area, such as a high efficiency WLAN new device (HE STA, high efficiency station), and a legacy device (legacy). Station), such as traditional 802.11ac/n devices.
  • the AP sends a MU-RTS frame whose receiving address is a broadcast address, where the frame carries the station identifiers of STA1 to STA4, and requests STA1 to STA4 to respond.
  • STA5 is an HE device
  • STA6 is a legacy device.
  • the STA does not respond to the CTS. If the AP fails to transmit the transmission opportunity (TXOP), the AP does not continue to send the radio frame. Channel and compete.
  • the legacy station STA6 can only parse a part of the MU-RTS content, for example, it can parse the receiving address and the Duration, and cannot understand what frame type the MU-RTS frame is, for what purpose.
  • the STA6 updates the NAV according to the reservation time indicated by the Duration and does not contend for the channel until the NAV expires to 0.
  • the HE site can parse the entire contents of the MU-RTS and understand the purpose of the MU-RTS.
  • the STA5 After the AP fails to acquire the channel using the MU-RTS, the STA5 starts to update the NAV according to the duration value of the MU-RTS. However, the STA5 determines whether the MU-RTS obtains the TXOP successfully before the NAV expires. The specific STA5 is in the MU-RTS.
  • the STA5 After detecting the channel, if the STA5 does not generate a reception start indication within the time T, that is, the AP and the STA1 to STA4 do not perform data transmission, it is considered that the AP transmitting the MU-RTS does not further transmit data, and the TXOP fails, and if the MU-RTS is judged to compete If the TXOP fails, STA5 can immediately contend for the channel.
  • the time T is the CTS transmission time, plus two short interframe spaces (SIFS, short interframe space), plus two detection slots (slots), plus a reception start delay.
  • STA5 is taken as an example, as follows:
  • the duration of the MU-RTS sent by the AP is updated by the NAV timer, and the STA5 continues to detect the channel in the time T, and determines that the MU-RTS fails to acquire the TXOP, and the STA5 contends to access the wireless channel, specifically:
  • STA5 suspends and saves the existing contention backoff process, starting a new backoff procedure for competing for the TU-RTS acquisition failed TXOP, and the new backoff procedure can use specialized contention parameters, such as dedicated contention window values.
  • both STA5 and STA7 compete for resources. If STA5 competes for backoff success, the transmission opportunity that STA5 contends is within the NAV of the duration update carried by the MU-RTS, and even if STA5 and STA7 compete for the channel multiple times within the failed transmission opportunity, It is necessary to ensure that the transmission opportunity of the competition is within the NAV of the Duration update carried by the MU-RTS.
  • the STA5 restores the contention backoff process that was originally suspended and performs channel contention access.
  • the STA5 may reset the NAV to 0. Specifically, the listening station (STA5) resets the network allocation vector of the reservation duration information carried by the multicast frame MU-RTS to Preset parameter 0 to save the current NAV value to another register or timer.
  • the legacy station STA6, and the HE stations STA5 start using the original competition process for fair competition at the same time.
  • STA5 or STA7 only transmits on the failed TXOP without excessive preemption of channel time, which guarantees certain fairness.
  • This embodiment describes the operation of resetting the NAV by the attending station, and specifically describes the operation of the auditing station (second station) resetting the network allocation vector of the reserved duration information carried by the multicast frame as a preset parameter, assuming that it is in an area.
  • HE STA high efficiency station
  • HE STA high efficiency station
  • BSS basic service set
  • OBSS overlapping basic service set
  • the AP sends a MU-RTS frame whose receiving address is a broadcast address, where the frame carries the station identifiers of STA1 to STA4, and requests STA1 to STA4 to respond.
  • STA5 is an HE site associated with the AP
  • STA6 is a device that is not associated with the AP.
  • the STA5 since the HE station STA5 can parse all the contents of the MU-RTS and confirm that it is sent by its own AP, the STA5 will update the NAV corresponding to the BSS according to the Duration value of the MU-RTS, and then the STA5 will expire in the NAV. Before, it is determined whether the MU-RTS obtains the TXOP successfully. The specific STA5 detects the channel after the MU-RTS. If the STA5 does not generate the reception start indication within the time T, the AP and the STA1 to the STA4 do not perform data transmission, and the TXOP fails.
  • the STA5 may reset the NAV updated by the reservation duration information carried by the MU-RTS, that is, the MU-RTS update is the BSS corresponding to the NAV, and the reset is also the BSS of the STA5. Corresponds to NAV.
  • the sender AP of the MU-RTS is not the AP of the BSS associated with the MU-RTS, that is, the OBSS is sent, and the OBSS (or the non-BSS, regular) NAV is updated when the update is performed.
  • the NAV of the OBSS that is, the network allocation vector of the reservation duration information carried by the multicast frame MU-RTS, should be reset according to the above principle.
  • an RTS frame can be considered as a special case of a MU-RTS frame, that is, in the case of only one user, the above multicast frame.
  • the group members have only one site.
  • the listening station when the listening station maintains a timer of more than one NAV, for example, more than two, it may be determined that the transmission opportunity initiated by the radio frame fails, but the one or more corresponding ones of the plurality of NAVs are updated according to the radio frame. NAV, the listening site resets the radio frame carrying The NAV of the reservation duration information update, that is, those NAVs are updated with Duration, and the corresponding NAV is also reset when resetting.
  • the foregoing technical solution of the embodiment of the present invention can be applied to a multi-user transmission network allocation vector setting process, and the WLAN station receives the radio frame transmitted by multiple users, especially when controlling the frame, and updates and resets the NAV mechanism, which can make more
  • the destination station of the user radio frame can accurately determine the channel condition and correctly respond to the multi-user radio frame.
  • the observing station can use the released resources when it is informed that the transmission opportunity triggered by the multi-user radio frame fails or is available. Try to avoid affecting the competition channel of traditional equipment, ensure a certain fairness, and improve network efficiency.

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Abstract

本发明提出一种多用户传输网络分配矢量设置方法和装置，涉及无线通信领域，所述方法包括：第一站点接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；所述第一站点使用未被所述组播帧更新的网络分配矢量的值判断信道状态。本发明的上述技术方案可以应用于多用户传输过程中的网络分配矢量的设置与重设，能够改善网络效率。

Description

一种多用户传输网络分配矢量设置方法和装置 技术领域
本发明涉及无线通信领域，具体涉及一种多用户传输网络分配矢量设置方法和装置。
背景技术
WLAN(Wireless Local Area Networks，无线局域网)的一个基本服务集(BSS，basic service set)一般如图1所示，一般包括一个接入点AP(access point，接入点)和多个非AP站点(non-AP station)。目前，共享媒介无线网络，特别是无线局域网(WLAN)为了多个站点或多个网络之间进行传输媒介共享并避免互相干扰，一般使用载波检测技术判断信道是否被占用，载波检测技术可以分为两种：物理载波检测和虚拟载波检测。物理载波检测是指通过对无线信道进行监听，判断接收能量是否超过某一门限，若超过门限则认为信道被占用；虚拟载波检测是指收发双方通过发送无线帧，无线帧中携带后续传输需要预约的信道时间(Duration)，其他站点根据接收到的预约时间在本地维护一个网络分配矢量(NAV，network allocation vector)，若站点的NAV不为0，则站点不竞争信道。另外，除了NAV，WLAN还定义了其他的虚拟载波检测机制，例如响应指示退避(RID，response indication deferral)，或根据物理层信令中的时间指示维护信道预约占用时间等机制。
目前IEEE(Institute of Electrical and Electronics Engineers，电气和电子工程师协会)标准组织为了解决WLAN网络效率问题，引入了并行多用户数据传输技术，引起了广泛关注和研究，并设计了很多新的无线帧用于辅助并完成多用户数据传输。当站点收到这些新的用于多用户传输的无线帧，特别是用于多用户传输的控制帧时，若沿用原来WLAN定义的虚拟载波检测设置或重设规则将会带来问题，主要的：
1、用于多用户传输的无线帧，例如多用户请求发送帧(MU-RTS，Multi-user Request to Send)、触发帧(TR，Trigger Frame)，多为广播帧。且这些广播帧要求多个目的站点进行响应，这与传统广播帧不同。收到用于多用户传输无线帧，例如MU-RTS，目的站点的NAV设置规则与是否响应的判定存在矛盾，需要设计新的虚拟载波更新规则。
2、传统设备只能解析新的用于多用户传输的无线帧的一部分，目前的虚拟载波检测规则会造成新设备和传统设备在竞争时不公平，需要尽量避免新设备使用贪婪的规则影响传统设备的传输。
综上所述，要改善网络效率，虚拟载波检测仍然是WLAN使用的一项基本技术，但是针对多用户传输设计的无线帧，很多原有规则不再适用，需要设计新的虚拟载波检测更新及重设规则以保证新旧设备能够更好的共存。
发明内容
本发明实施例针对并行多用户数据传输时虚拟载波检测存在的问题，提供一种多用户传输网络分配矢量设置方法和装置。
为了实现上述发明目的，本发明的一个实施例采取的技术方案如下：
一种多用户传输网络分配矢量设置方法，包括：
第一站点接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
所述第一站点使用未被所述组播帧更新的网络分配矢量的值判断信道状态。
本发明优选实施例中，所述方法还包括：
所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量。
本发明优选实施例中，所述第一站点使用所述组播帧携带的预约时长 信息更新网络分配矢量包括：
当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
当判断所述信道状态为忙时，保持当前网络分配矢量的值。
本发明优选实施例中，所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量包括：
更新第一站点所在的网络对应的网络分配矢量；
所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
本发明优选实施例中，所述方法还包括：
当判断所述信道状态为闲时，所述第一站点发送响应帧响应所述组播帧。
本发明优选实施例中，所述响应帧为清除发送帧CTS，或者为符合上行多用户无线帧格式的无线帧。
本发明优选实施例中，判断所述信道状态为闲包括：
所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与所述组播帧的发送地址一致。
本发明优选实施例中，要求响应的组播帧包括：多用户请求发送MU-RTS帧、触发Trigger帧、使用并行多用户方式发送的多个帧、或者接收地址为广播或多播地址的无线帧。
为解决上述技术问题，本发明的另一个实施例还提供一种多用户传输网络分配矢量设置方法，包括：
第二站点接收要求响应的组播帧，并确定所述第二站点为不要求响应的站点；
所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量；
当所述第二站点判断所述组播帧发起的传输机会失败时，所述第二站点竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
本发明优选实施例中，所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量之前包括：所述第二站点判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
本发明优选实施例中，所述第二站点判断所述第二站点与发送所述组播帧的站点的状态满足更新条件包括：
所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
本发明优选实施例中，所述第二站点判断所述组播帧发起的传输机会失败包括：
所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
本发明优选实施例中，所述第二站点判断所述组播帧发起的传输机会失败之后还包括：
所述第二站点重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
本发明优选实施例中，所述第二站点判断所述组播帧发起的传输机会 失败之后包括：
挂起所述第二站点当前的退避过程，并且启动新的退避过程。
本发明优选实施例中，所述竞争的传输机会在所述失败的传输机会之内包括：
所述第二站点在所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间内竞争传输机会发送的无线帧传输不超出所述网络分配矢量指示的时间。
本发明优选实施例中，所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间到期之后还包括：所述第二站点恢复挂起的退避过程。
本发明优选实施例中，所述新的退避过程使用竞争退避参数，其中所述竞争退避参数包括以下的一项或者多项：竞争窗口，帧间间隔，检测时隙长度。
为解决上述技术问题，本发明的另一个实施例还提供一种多用户传输网络分配矢量设置装置，包括：
第一判定模块，设置为接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
第一矢量模块，设置为使用未被所述组播帧更新的网络分配矢量的值判断信道状态。
本发明优选实施例中，所述装置还包括：
更新模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量。
本发明优选实施例中，所述更新模块包括：
第一设置单元，设置为当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
第二设置单元，设置为当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
第三设置单元，设置为当判断所述信道状态为忙时，保持当前网络分配矢量的值。
本发明优选实施例中，所述更新模块包括：
第一更新单元，设置为更新第一站点所在的网络对应的网络分配矢量；
所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
本发明优选实施例中，所述装置还包括：
响应模块，当判断所述信道状态为闲时，所述第一站点发送响应帧响应所述组播帧。
本发明优选实施例中，所述第一设置单元判断所述信道状态为闲是指：
所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与所述组播帧的发送地址一致。
为解决上述技术问题，本发明的另一个实施例还提供一种多用户传输网络分配矢量设置装置，包括：
第二判定模块，设置为接收要求响应的组播帧，并确定第二站点为不要求响应的旁听站点；
第二矢量模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量；
竞争模块，设置为当所述第二站点判断所述组播帧发起的传输机会失败时，所述第二站点竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
本发明优选实施例中，所述装置还包括：条件模块，设置为判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
本发明优选实施例中，所述条件模块判断所述第二站点与发送所述组 播帧的站点的状态满足更新条件是指：
所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
本发明优选实施例中，所述竞争模块判断所述组播帧发起的传输机会失败是指：
所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
本发明优选实施例中，所述装置还包括：矢量重设模块，设置为重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
本发明优选实施例中，所述装置还包括：退避模块，设置为：挂起所述第二站点当前的退避过程，并且启动新的退避过程。
本发明优选实施例中，所述退避模块还设置为：所述第二站点恢复挂起的退避过程。
在本发明实施例中，还提供了一种计算机存储介质，该计算机存储介质可以存储有执行指令，该执行指令用于执行上述实施例中的多用户传输网络分配矢量设置方法的实现。
本发明和现有技术相比，具有如下有益效果：
本发明实施例提供的多用户传输网络分配矢量设置方法和装置，WLAN站点接收到多用户传输的无线帧，特别是控制帧时，更新和重设NAV的机制，可以让多用户无线帧的目的站点能够准确判断信道状况，对上述多用户无线帧进行正确的响应；另外可以让旁听站点在获知上述多用户无线帧触发的传输机会失败或可用时，可以使用释放的资源并且尽量避免影响传统设备竞争信道，保证了一定的公平性，可以应用于多用户传输 过程中的网络分配矢量的设置与重设，能够改善网络效率。
附图说明
图1是现有技术中WLAN基本服务集合示例图；
图2是本发明实施例的一种多用户传输网络分配矢量设置方法的流程图；
图3是本发明实施例的一种多用户传输网络分配矢量设置装置的结构示意图；
图4是本发明实施例的一种多用户传输网络分配矢量设置方法的流程图；
图5是本发明实施例的一种多用户传输网络分配矢量设置装置的结构示意图；
图6是本发明实施例一的MU-RTS帧的目的站点的处理流程示例图；
图7是本发明实施例二的Trigger帧的目的站点的处理流程示例图；
图8是本发明实施例三的多个虚拟载波计时器过程示例图；
图9是本发明实施例四的MU-RTS帧的旁听站点的处理流程示例图。
具体实施方式
为使本发明的发明目的、技术方案和有益效果更加清楚明了，下面结合附图对本发明的实施例进行说明，需要说明的是，在不冲突的情况下，本申请中的实施例和实施例中的特征可以相互任意组合。
如图1所示，本发明实施例提供一种多用户传输网络分配矢量设置方法，包括：
S101、第一站点接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
S102、所述第一站点使用未被所述组播帧更新的网络分配矢量的值判 断信道状态。
步骤S101中，第一站点接收到要求响应的组播帧后，需要判定所述第一站点为被要求响应的目的站点。
步骤S102之后还包括：
S103所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量。
步骤S103包括：
当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
当判断所述信道状态为忙时，保持当前网络分配矢量的值。
步骤S103包括：
更新第一站点所在的网络对应的网络分配矢量；
所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
步骤S103之后还包括：
S104、当判断所述信道状态为闲时，所述第一站点发送响应帧响应所述组播帧。
所述响应帧为清除发送帧CTS(clear to send)，或者为符合上行多用户无线帧格式的无线帧。
判断所述信道状态为闲包括：
所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与 所述组播帧的发送地址一致。
其中，本发明实施例中第一预设值为0。
要求响应的组播帧包括：多用户请求发送MU-RTS帧、触发Trigger帧、使用并行多用户方式发送的多个帧、或者接收地址为广播或多播地址的无线帧。
如图4所示，本发明实施例提供一种多用户传输网络分配矢量设置方法，包括：
S201、第二站点接收要求响应的组播帧，并确定所述第二站点为不要求响应的站点；
S202、所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量。
步骤S201中，第二站点接收要求响应的组播帧后，需要所述第二站点为不被要求响应的旁听站点。
步骤S202之后还包括：
S203、当所述第二站点判断所述组播帧发起的传输机会失败时，所述第二站点竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
步骤S202之前包括：
S210、所述第二站点判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
步骤S210包括：
所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
步骤S203中所述第二站点判断所述组播帧发起的传输机会失败包括：
所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
所述第二站点判断所述组播帧发起的传输机会失败之后还包括：
所述第二站点重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
其中，本发明实施例中，所述时间T可以为所述组播帧的响应帧的传输时间加上一个或者多个帧间间隔时间，加上一个或者多个检测时隙时间，再加上接收延迟时间。本发明实施例中预设参数为0。
步骤S203判断所述组播帧发起的传输机会失败之后包括：
挂起所述第二站点当前的退避过程，并且启动新的退避过程。
竞争过程和目前的wifi的竞争过程一致，为CSMA(Carrier Sense Multiple Access，载波侦听多路访问)机制。挂起的时刻为检测到所述组播帧的时刻或判断所述组播帧发起的传输机会失败时刻。
开始新的退避过程的时刻为判断所述组播帧发起的传输机会失败时刻。
所述新的退避过程使用新的竞争退避参数，其中所述新的竞争退避参数包括判新的竞争窗口、新的帧间间隔、新的检测时隙长度等参数。
步骤S203中所述竞争的传输机会在所述失败的传输机会之内包括：
所述第二站点在所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间内竞争传输机会发送的无线帧传输不超出所述网络分配矢量指示的时间。
所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间到期之后还包括：所述第二站点恢复挂起的退避过程。此处也可以理解为，恢复挂起第二站点的退避过程。
恢复挂起是在所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间到期的时刻。恢复的退避过程是上述保存挂起的竞争退避过程。
目前的wifi协议中，组播帧一般是没有响应帧的，本发明实施例中涉及的组播帧为要求响应的组播帧，即AP发送该组播地址帧后，有一个或多个站点会发送响应帧，这一个或多个站点的标识会在组播帧的帧体中携带。所述第一站点就是帧体中有其标识的站点，第二站点为组播帧中没有其标识的站点。收到的组播帧要求有响应的，第一站点为响应站点，即目的站点，第二站点为旁听站点，即不响应的站点。
如图3所示，本发明实施例提供一种多用户传输网络分配矢量设置装置，设置于第一站点，包括：
第一判定模块，设置为接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
第一矢量模块，设置为使用未被所述组播帧更新的网络分配矢量的值判断信道状态。
所述装置还包括：
更新模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量。
所述更新模块包括：
第一设置单元，设置为当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
第二设置单元，设置为当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
第三设置单元，设置为当判断所述信道状态为忙时，保持当前网络分配矢量的值。
所述更新模块包括：
第一更新单元，设置为更新第一站点所在的网络对应的网络分配矢量；
所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
所述的装置还包括：
响应模块，当判断所述信道状态为闲时，发送响应帧响应所述组播帧。
所述第一设置单元判断所述信道状态为闲是指：
所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与所述组播帧的发送地址一致。
如图5所示，本发明实施例提供一种多用户传输网络分配矢量设置装置，设置于第二站点，包括：
第二判定模块，设置为接收要求响应的组播帧，并确定第二站点为不要求响应的旁听站点；
第二矢量模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量；
竞争模块，设置为当所述第二站点判断所述组播帧发起的传输机会失败时，竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
所述装置还包括：条件模块，设置为判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
所述条件模块判断所述第二站点与发送所述组播帧的站点的状态满足更新条件是指：
所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
所述竞争模块判断所述组播帧发起的传输机会失败是指：
所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
所述装置还包括：矢量重设模块，设置为重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
所述装置还包括：退避模块，设置为挂起所述第二站点当前的退避过程，并且启动新的退避过程。
所述退避模块还设置为：所述第二站点恢复挂起的退避过程。
实施例一
AP发送接收地址为广播地址的MU-RTS帧，其中该帧中携带STA1～STA4的站点标识，要求STA1～STA4进行响应。以STA1为例，如图6所示，其接收过程如下所述，STA2～STA4的操作类似STA1：
STA1接收MU-RTS帧，发现发送方地址为自己关联的AP的MAC地址或自己关联AP的其他标识，且STA1检测到所述MU-RTS帧中包含有自己的标识，并要自己发送CTS帧响应该MU-RTS帧。
所述MU-RTS帧的接收地址为广播地址，并携带预约时长Duration信息，该广播地址不等于STA1的地址，则STA1按照Duration更新NAV之前，查看未被MU-RTS的Duration更新的NAV计时器，若该计时器指示信道空闲，则STA1发送CTS给AP，若该计时器指示信道为忙，STA1不回复CTS。
其中，该过程还包括查看未被MU-RTS的Duration更新的NAV计时器，判断信道忙闲之后还包括，若该计时器指示信道空闲，则使用MU-RTS的Duration值更新NAV计时器；若该计时器指示信道忙，则保持NAV计 时器的值，忽略MU-RTS的Duration值。
所述使用NAV计时器的值判断忙闲是指，当所述计时器的值为0，或者所述计时器的值为非0值，但所述计时器对应的信道时间或机会持有方为所述MU-RTS的发送方时，认为信道为闲，否则信道为忙。
需要说明的是本实施中的广播帧也可以是Trigger帧等其他要求回复的组播帧。
实施例二
AP发送接收地址为广播地址的Trigger帧，其中该帧中携带STA1～STA4的站点标识，要求STA1～STA4进行上行数据传输。以STA1为例，其接收过程如下及图7所述：
STA1接收Trigger帧，发现发送方地址为自己关联的AP的MAC地址或自己关联AP的其他标识(例如AP有多个基本服务集标识(BSSID，basic service set identifier)，发送方地址可以为其多个BSSID中的公用BSSID)，且STA1检测到所述Trigger帧中包含有自己的标识和分配给自己的上行传输资源，并要自己发送上行数据帧响应该Trigger帧。
所述Trigger帧的接收地址为广播地址，并携带预约时长Duration信息，该广播地址不等于STA1的地址，则STA1按照Duration更新NAV之前，查看未被Trigger的Duration更新的NAV计时器，若该计时器指示信道空闲，则STA1发送上行帧给AP，若该计时器指示信道为忙，STA1可以不回复上行帧。另外，若该计时器指示信道为忙，STA1可以根据其他条件确定是否回复上行帧，例如回复的帧为应答帧或短帧时，站点可以忽略信道忙闲状态，而回复上行帧。
其中，该过程还包括查看未被Trigger的Duration更新的NAV计时器，判断信道忙闲之后还包括，若该计时器指示信道空闲，则使用Trigger的Duration值更新NAV计时器；若该计时器指示信道忙，则比较当前NAV计时器的值与Trigger帧的Duration值，若Duration的值大于NAV计时器 的值，则使用Trigger帧的值更新NAV计时器的值。
需要说明的是本实施中的广播帧也可以是MU-RTS帧等其他要求回复的组播帧。
实施例三
本实施例中假设站点支持多个NAV计时器，或支持多种虚拟载波检测计时器，这里假设站点支持两个NAV计时器,一个计时器记录该站点关联的基本服务集(BSS，basic service set)的虚拟载波检测结果，另一个记录其他重叠基本服务集(OBSS，overlapping basic service set)的虚拟载波检测结果。AP发送接收地址为广播地址的MU-RTS帧，其中该帧中携带STA1～STA4的站点标识，要求STA1～STA4进行响应。以STA1为例，其处理过程如下及图8所述：
STA1接收MU-RTS帧，发现发送方地址为自己关联的AP的MAC地址，且STA1检测到所述MU-RTS帧中包含有自己的标识，并要自己发送CTS帧响应该MU-RTS帧。
所述MU-RTS帧的接收地址为广播地址，并携带预约时长Duration信息，该广播地址不等于STA1的地址，但是发送地址为关联AP的地址，则STA1按照Duration更新所属BSS对应的NAV计时器，并查看未被MU-RTS的Duration更新的OBSS对应的NAV计时器，若该OBSS计时器指示信道空闲，则STA1发送CTS给AP，若该OBSS计时器指示信道为忙，STA1不回复CTS。
其中，使用MU-RTS的Duration值更新所属BSS的NAV计时器是指，使用Duration的值设置BSS NAV计时器的值，不论Duration的值与当前BSS NAV的值之间的大小。或者，将Duration的值与当前BSS NAV的值比较，若Duration的值大，则更新NAV，否则不更新。
实施例四
本实施例说明旁听站点重设NAV的操作，假设在一个区域内，存在多种制式的WLAN设备，例如存在高效率的WLAN新设备(HE STA，high efficiency station)，也存在传统的设备(legacy station)，例如传统的802.11ac/n等设备。AP发送接收地址为广播地址的MU-RTS帧，其中该帧中携带STA1～STA4的站点标识，要求STA1～STA4进行响应。STA5，STA7为HE设备，STA6为legacy设备。假设AP发送MU-RTS后，由于各种原因，STA1～STA4都没有回复响应帧CTS，则AP认为获取传输机会(TXOP，transmission opportunity)失败，则AP不会继续发送无线帧，而是重新检测信道并竞争。
对于TXOP失败的情况，由于传统站点STA6只能解析MU-RTS一部分内容，例如能够解析接收地址和Duration，而无法了解MU-RTS帧是什么帧类型，用于什么目的。当AP使用MU-RTS获取信道失败后，STA6会按照Duration指示的预约时间更新NAV并直到NAV到期为0后才能竞争信道。
对于TXOP失败的情况，由于HE站点(以STA5为例)可以解析MU-RTS全部内容，并了解MU-RTS的用途。当AP使用MU-RTS获取信道失败后，STA5开始也会按照MU-RTS的Duration值更新NAV，但是STA5会在NAV到期前，判断MU-RTS是否获取TXOP成功，具体的STA5在MU-RTS之后检测信道，若时间T内，STA5没有产生接收开始指示，即AP和STA1～STA4没有进行数据传输，则认为发送MU-RTS的AP没有进一步的发送数据，TXOP失败，若判断MU-RTS竞争的TXOP失败，则STA5可以立即竞争信道。所述时间T为CTS传输时间，加上两个短帧间间隔(SIFS，short interframe space)，加上两个检测时隙(slot),再加上一个接收开始延迟。
如上所述，为了尽量保证公平性，本发明中，设置STA5，STA7的竞争及发送规则，尽量减少对STA6的不公平性，具体的，以STA5为例，如下及图9所述：
STA5被AP发送的MU-RTS的Duration更新了NAV计时器，则STA5在时间T内继续检测信道，并且判断MU-RTS获取TXOP失败，STA5竞争接入无线信道，具体的：
STA5挂起并保存现有的竞争退避过程，开始一个新的退避过程用于竞争所述MU-RTS获取失败的TXOP，新的退避过程可以使用专门的竞争参数，例如专门的竞争窗口值。此时STA5和STA7都会竞争资源，假设STA5竞争退避成功，则STA5竞争的传输机会在MU-RTS携带的Duration更新的NAV之内，且即使STA5，STA7在失败的传输机会内多次竞争信道也要保证竞争的传输机会在MU-RTS携带的Duration更新的NAV之内。
当MU-RTS携带的Duration指示的时间结束时刻到达时，即所述MU-RTS更新的NAV到期时，STA5将原来挂起保存的竞争退避过程恢复，并进行信道竞争接入。
另外，判断MU-RTS发起的TXOP失败后，STA5可以将NAV重设为0，具体的，旁听站点(STA5)重设所述组播帧MU-RTS携带的预约时长信息更新的网络分配矢量为预设参数0，将当前NAV的值保存到其他寄存器或计时器中。
这样当MU-RTS携带的Duration指示的结束时刻到达时，legacy站点STA6，和HE站点STA5，STA7在同一个时刻开始使用原来的竞争过程进行公平竞争。STA5或STA7只是在失败的TXOP上进行了传输，而没有过多的抢占信道时间，保证了一定的公平性。
实施例五
本实施例说明旁听站点重设NAV的操作，具体的描述旁听站点(第二站点)重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数的操作，假设在一个区域内存在高效率的WLAN新设备(HE STA，high efficiency station)，如实施例三所述，假设HE STA支持多个NAV计时器。这里假设支持两个NAV，一个计时器记录该站点关联的基本服务集 (BSS，basic service set)的虚拟载波检测结果，另一个记录其他重叠基本服务集(OBSS，overlapping basic service set)的虚拟载波检测结果。AP发送接收地址为广播地址的MU-RTS帧，其中该帧中携带STA1～STA4的站点标识，要求STA1～STA4进行响应。STA5为关联到上述AP的HE站点，STA6为未关联到上述AP的设备。假设AP发送MU-RTS后，由于各种原因，STA1～STA4都没有回复响应帧CTS，则AP认为获取传输机会(TXOP，transmission opportunity)失败，则AP不会继续发送无线帧，而是重新检测信道并竞争。
对于上述的情况，由于HE站点STA5可以解析MU-RTS全部内容，并确认由自己的AP所发送，STA5会按照MU-RTS的Duration值更新本BSS所对应的NAV，之后STA5会在NAV到期前，判断MU-RTS是否获取TXOP成功，具体的STA5在MU-RTS之后检测信道，若时间T内，STA5没有产生接收开始指示，即AP和STA1～STA4没有进行数据传输，认为TXOP失败，若判断MU-RTS竞争的TXOP失败，则STA5可以重设所述MU-RTS携带的预约时长信息更新的NAV，即上述MU-RTS更新的为本BSS对应NAV，重设的也为STA5的本BSS对应NAV。
如上所述，对于STA6的情况，可以判断MU-RTS的发送方AP不是自己关联的BSS的AP，即为OBSS发送的，则更新时更新OBSS(或非本BSS，regular)NAV，判断失败后重设时也应按照上述原则重设OBSS的NAV，即所述组播帧MU-RTS携带的预约时长信息更新的网络分配矢量。
同样的，对于其他无线帧，例如RTS帧，Trigger帧时，同样遵循本发明的原则，例如RTS帧可以认为是MU-RTS帧的一种特殊情况，即只有一个用户的情况，上述组播帧的组成员只有一个站点。
即旁听站点维护超过一个NAV的计时器时，例如可以超过两个，则判断所述无线帧发起的传输机会失败但自己有根据上述无线帧更新了多个NAV中某个或某几个对应的NAV，所述旁听站点重设所述无线帧携带 的预约时长信息更新的NAV，即当时用Duration更新了那些NAV，重设时也要重设对应的NAV。
虽然本发明所揭示的实施方式如上，但其内容只是为了便于理解本发明的技术方案而采用的实施方式，并非用于限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所揭示的核心技术方案的前提下，可以在实施的形式和细节上做任何修改与变化，但本发明所限定的保护范围，仍须以所附的权利要求书限定的范围为准。
工业实用性
本发明实施例的上述技术方案，可以应用于多用户传输网络分配矢量设置过程中，WLAN站点接收到多用户传输的无线帧，特别是控制帧时，更新和重设NAV的机制，可以让多用户无线帧的目的站点能够准确判断信道状况，对上述多用户无线帧进行正确的响应；另外可以让旁听站点在获知上述多用户无线帧触发的传输机会失败或可用时，可以使用释放的资源并且尽量避免影响传统设备竞争信道，保证了一定的公平性，并能够改善网络效率。

Claims (35)

  1. 一种多用户传输网络分配矢量设置方法，包括：
    第一站点接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
    所述第一站点使用未被所述组播帧更新的网络分配矢量的值判断信道状态。
  2. 如权利要求1所述的方法，其中：还包括：
    所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量。
  3. 如权利要求2所述的方法，其中：所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量包括：
    当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
    当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
    当判断所述信道状态为忙时，保持当前网络分配矢量的值。
  4. 如权利要求2所述的方法，其中，所述第一站点使用所述组播帧携带的预约时长信息更新网络分配矢量包括：
    更新第一站点所在的网络对应的网络分配矢量；
    所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
  5. 如权利要求1所述的方法，其中：还包括：
    当判断所述信道状态为闲时，所述第一站点发送响应帧响应所述组播帧。
  6. 如权利要求5所述的方法，其中，所述响应帧为清除发送帧CTS，或者为符合上行多用户无线帧格式的无线帧。
  7. 如权利要求3、4或5所述的方法，其中：判断所述信道状态为闲包括：
    所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
    所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与所述组播帧的发送地址一致或者传输机会持有方为本基本服务集BSS设备。
  8. 如权利要求1所述的方法，其中：要求响应的组播帧包括：多用户请求发送MU-RTS帧、触发Trigger帧、使用并行多用户方式发送的多个帧、或者接收地址为广播或多播地址的无线帧。
  9. 如权利要求1所述的方法，其中：所述多用户帧MU-RTS或触发Trigger帧的用户数为一个用户时，所述组播帧为单播的RTS帧或Trigger帧；并行多用户方式发送的多个帧中的帧是单播或组播的。
  10. 一种多用户传输网络分配矢量设置方法，包括：
    第二站点接收要求响应的组播帧，并确定所述第二站点为不要求响应的站点；
    所述第二站点使用所述组播帧携带的预约时长信息更新网络分 配矢量；
    当所述第二站点判断所述组播帧发起的传输机会失败时，所述第二站点竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
  11. 如权利要求10所述的方法，其中：所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量之前包括：所述第二站点判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
  12. 如权利要求11所述的方法，其中，所述第二站点判断所述第二站点与发送所述组播帧的站点的状态满足更新条件包括：
    所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
  13. 如权利要求10所述的方法，其中：所述第二站点判断所述组播帧发起的传输机会失败包括：
    所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
  14. 如权利要求10所述的方法，其中：所述第二站点判断所述组播帧发起的传输机会失败之后还包括：
    所述第二站点重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
  15. 如权利要求10所述的方法，其中：所述第二站点判断所述组播帧发起的传输机会失败之后包括：
    挂起所述第二站点当前的退避过程，并且启动新的退避过程。
  16. 如权利要求10所述的方法，其中：所述竞争的传输机会在所述失败的传输机会之内包括：
    所述第二站点在所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间内竞争传输机会发送的无线帧传输不超出所述网络分配矢量指示的时间。
  17. 如权利要求15或16所述的方法，其中：所述组播帧携带的预约时长信息更新的网络分配矢量指示的时间到期之后还包括：所述第二站点恢复挂起的退避过程。
  18. 如权利要求15所述的方法，其中：所述新的退避过程使用竞争退避参数，其中所述竞争退避参数包括以下的一项或者多项：竞争窗口，帧间间隔，检测时隙长度。
  19. 如权利要求10所述的方法，其中：所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量包括：
    当所述组播帧为所述第二站点所在的BSS的站点发送，则更新本BSS对应的网络分配矢量；
    当所述组播帧为非所述第二站点所在的BSS的站点发送，则更新非所述第二站点所在的对应的BSS的网络分配矢量。
  20. 如权利要求10或19所述的方法，其中：所述第二站点使用所述组播帧携带的预约时长信息更新网络分配矢量还包括：所述第二站点判断所述组播帧发起的传输机会失败之后，重设所述组播帧携带 的预约时长信息更新的网络分配矢量为预设参数。
  21. 一种多用户传输网络分配矢量设置装置，包括：
    第一判定模块，设置为接收要求响应的组播帧，并确定所述第一站点为要求响应的目的站点；
    第一矢量模块，设置为使用未被所述组播帧更新的网络分配矢量的值判断信道状态。
  22. 如权利要求21所述的装置，其中：还包括：
    更新模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量。
  23. 如权利要求22所述的装置，其中：所述更新模块包括：
    第一设置单元，设置为当判断所述信道状态为闲时，将网络分配矢量设置为所述预约时长信息的值；
    第二设置单元，设置为当判断所述信道状态为忙时，按照当前网络分配矢量的值和所述预约时长的值之中较大的值设置网络分配矢量；或者，
    第三设置单元，设置为当判断所述信道状态为忙时，保持当前网络分配矢量的值。
  24. 如权利要求22所述的装置，其中，所述更新模块包括：
    第一更新单元，设置为更新第一站点所在的网络对应的网络分配矢量；
    所述未被所述组播帧更新的网络分配矢量是指非第一站点所在的网络对应的网络分配矢量。
  25. 如权利要求22所述的装置，其中：还包括：
    响应模块，当判断所述信道状态为闲时，发送响应帧响应所述组播帧。
  26. 如权利要求21所述的装置，其中：所述第一设置单元判断所述信道状态为闲是指：
    所述未被所述组播帧更新的网络分配矢量的值为第一预设值，或者，
    所述未被所述组播帧更新的网络分配矢量为除第一预设值外的取值，且所述除第一预设值外的取值的网络分配矢量对应的传输机会持有方与所述组播帧的发送地址一致。
  27. 一种多用户传输网络分配矢量设置装置，包括：
    第二判定模块，设置为接收要求响应的组播帧，并确定第二站点为不要求响应的旁听站点；
    第二矢量模块，设置为使用所述组播帧携带的预约时长信息更新网络分配矢量；
    竞争模块，设置为当所述第二站点判断所述组播帧发起的传输机会失败时，竞争传输机会，且所述竞争的传输机会在所述失败的传输机会之内。
  28. 如权利要求27所述的装置，其中：还包括：条件模块，设置为判断所述第二站点与发送所述组播帧的站点的状态满足更新条件。
  29. 如权利要求27所述的装置，其中，所述条件模块判断所述第二站点与发送所述组播帧的站点的状态满足更新条件是指：
    所述第二站点与发送所述组播帧的站点属于同一网络；或，所述第二站点与发送所述组播帧的站点不属于同一网络，且所述组播帧的接收信号强度大于门限TH，则确定所述第二站点与发送所述组播帧的站点的状态满足更新条件。
  30. 如权利要求27所述的装置，其中：所述竞争模块判断所述组播帧发起的传输机会失败是指：
    所述组播帧结束后的时间T内，在所述第二站点未产生接收开始指示或者未检测到有效的物理帧头；或者所述组播帧结束后的时间T内，所述第二站点检测到的信号强度低于门限TH，则确定所述组播帧发起的传输机会失败。
  31. 如权利要求27所述的装置，其中：还包括：矢量重设模块，设置为重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
  32. 如权利要求27所述的装置，其中：还包括：退避模块，设置为：
    挂起所述第二站点当前的退避过程，并且启动新的退避过程。
  33. 如权利要求30所述的装置，其中：所述退避模块还设置为：所述第二站点恢复挂起的退避过程。
  34. 如权利要求27所述的装置，其中：所述第二矢量模块使用所述组播帧携带的预约时长信息更新网络分配矢量是指：
    当所述组播帧为所述第二站点所在的BSS的站点发送，则更新本BSS对应的网络分配矢量；
    当所述组播帧为非所述第二站点所在的BSS的站点发送，则更新 非所述第二站点所在的对应的BSS的网络分配矢量。
  35. 如权利要求27或34所述的装置，其中：所述第二矢量模块还设置为：所述组播帧发起的传输机会失败之后，重设所述组播帧携带的预约时长信息更新的网络分配矢量为预设参数。
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