WO2017107736A1 - 更新或者修改nav的方法及装置 - Google Patents

更新或者修改nav的方法及装置 Download PDF

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Publication number
WO2017107736A1
WO2017107736A1 PCT/CN2016/107210 CN2016107210W WO2017107736A1 WO 2017107736 A1 WO2017107736 A1 WO 2017107736A1 CN 2016107210 W CN2016107210 W CN 2016107210W WO 2017107736 A1 WO2017107736 A1 WO 2017107736A1
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WIPO (PCT)
Prior art keywords
link
node
nav
ppdu
end node
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PCT/CN2016/107210
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English (en)
French (fr)
Inventor
杨懋
李波
马驰翔
罗俊
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华为技术有限公司
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Publication of WO2017107736A1 publication Critical patent/WO2017107736A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • 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
    • 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 information technology, and in particular, to a method and apparatus for updating or modifying a NAV.
  • wireless local area network (English name: Wireless Local Area Networks, English abbreviation: WLAN) has also developed, the existing 802.11ac-based WLAN system uses OFDM modulation, in media access control (English full name: Media Access Control, the English abbreviation: MAC) layer does not consider the data transmission based on spatial reuse (English full name: Spatial Reuse, English abbreviation: SR), so when the number of users is relatively dense, the contention rate of competition between users in order to send data It will be greatly improved, so it is necessary to consider the data transmission of SR and update the network allocation vector (English name: Network Allocation Vector, English abbreviation: NAV) to improve data transmission efficiency and improve system performance.
  • OFDM modulation in media access control
  • MAC Media Access Control
  • SR Spatial Reuse
  • NAV Network Allocation Vector
  • a method for updating or updating the NAV when the node receives the basic service set (English full name: Basic Service Set, English abbreviation: BSS), the node sends the permission to send (English full name: Clear to Send, English abbreviation: CTS).
  • the received power corresponding to the message is less than the preset threshold, and the received power corresponding to the request sending (English full name: Request to Send, English abbreviation: RTS) message sent by the node in the non-BSS is less than the preset threshold,
  • the nodes in the BSS re-update the NAV.
  • the NAV is updated by the above method
  • both the transmitting end and the receiving end are updated to re-update the NAV, due to the wireless fidelity in the dense scene (English full name) :Wireless Fidelity, In the English abbreviation: WiFi)
  • the probability that the received power of the above two messages is less than the preset threshold is less than the probability that the SR data can be transmitted. Therefore, when the above conditions are satisfied, the NAV is updated, resulting in an opportunity for SR data transmission. Lower.
  • the present invention provides a method and apparatus for updating or modifying a NAV, which can improve transmission opportunities of SR data.
  • an embodiment of the present invention provides a method for updating or modifying a NAV, where the method includes:
  • the node of the first link listens to the physical layer aggregation procedure protocol data unit PPDU sent by the node in the overlapping basic service set OBSS, and the node in the OBSS includes: the sending end node of the second link and the receiving end of the second link a node, the first link is a space reuse link, and the second link is a link that is communicating;
  • the node of the first link updates or modifies the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the sending end node of the first link maintains the step that the set NAV is not updated, and further includes:
  • the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, the sending end node of the first link receives the received power corresponding to the second PPDU according to a size relationship between the preset thresholds, and the second PPDU carries a size relationship between the value in the duration Duration field and the current NAV value, and determines whether to update the NAV, where the second PPDU includes: allowing the CTS frame to be sent. /Enhanced to allow transmission of an ECTS frame, reception of an acknowledgment ACK frame or an uplink data frame, the Duration field being used to indicate the length of the transmission opportunity duration TxOP.
  • the sending end node of the first link receives the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the second PPDU carries the value in the duration Duration field and the current NAV value.
  • the relationship between the size and the number of steps to determine whether to update the NAV including:
  • the transmitting end node of the first link updates the NAV to a value in the Duration field.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the relationship between the size and the number of steps to determine whether to update the NAV includes:
  • the sender node of the first link updates the NAV to a value in the Duration field.
  • the sending end node of the first link is based on the first PPDU sent by the sending end node of the second link that is monitored, and the value in the Duration field is greater than the sending of the first link.
  • the step of updating, by the sending end node of the first link, the NAV is a value in the duration field, and then:
  • the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, the sending end node of the first link receives the second PPDU according to the receiving Determines whether to modify the updated NAV by the relationship between the power and the preset threshold.
  • the step of determining, by the sending end node of the first link, whether to modify the updated NAV according to the relationship between the received power of the second PPDU and the preset threshold specifically includes:
  • the sending end node of the first link modifies the updated NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the transmitting end node of the first link updates the NAV to a first time length according to the first PPDU sent by the sending end node of the second link, and the first time length is a second PPDU. And a sum of the transmission time and the short inter-frame interval SIFS, wherein the SIFS is between the first PPDU of the first link and the second PPDU being monitored. time interval.
  • the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, the sending end node of the first link receives the receiving power corresponding to the second PPDU. Determines whether to modify the updated NAV by the size relationship between the preset thresholds.
  • the step of determining, by the sending end node of the first link, whether to modify the updated NAV according to the relationship between the received power of the second PPDU and the preset threshold specifically includes:
  • the sending end node of the first link modifies the updated NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the transmitting end node of the first link does not listen to the first PPDU sent by the sending end node of the second link, and only listens to the second PPDU sent by the receiving end node of the second link
  • the sending end node of the first link is configured according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU, and the first chain.
  • the size relationship between the current NAV values of the nodes of the road determines whether to update the NAV.
  • the sending end node of the first link is configured according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU, and the first chain.
  • the step of determining the relationship between the current NAV values of the sending end nodes of the path and determining whether to update the NAV includes:
  • the sending end node of the first link updates the NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the sending end node of the first link listens to the triggering frame sent by the receiving end node of the second link, the sending end node of the first link receives the receiving power corresponding to the triggering frame according to Determine the size of the preset threshold to determine whether to update the NAV.
  • the step of determining, by the sending end node of the first link, whether to update the NAV according to the relationship between the received power corresponding to the triggering frame and the preset threshold specifically includes:
  • the sending end node of the first link updates the NAV
  • the transmitting end node of the first link keeps the set NAV from being updated.
  • the transmitting end node of the first link listens to the first PPDU sent by the sending end node of the second link, and the sending end node of the first link keeps the updated NAV unchanged.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the receiving end node of the first link If the receiving end node of the first link only listens to the second PPDU sent by the receiving end node of the second link, the receiving end node of the first link receives the a magnitude relationship between a received power corresponding to the second PPDU and a preset threshold, and a relationship between a value in a duration Duration field carried by the second PPDU and a current NAV value of the receiving end node of the first link Determining whether to update the NAV, the second PPDU includes: clearing a transmit CTS frame/enhanced allow-transmitting ECTS frame, and receiving an acknowledgement ACK frame.
  • the step of determining the relationship between the current NAV values of the receiving end nodes of the path and determining whether to update the NAV includes:
  • the receiving end node of the first link updates the NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the receiving end node of the first link maintains the step that the set NAV is not updated, and further includes:
  • the receiving end node of the first link listens to the second PPDU sent by the receiving end of the second link, the receiving end node of the first link receives the receiving power corresponding to the second PPDU. a size relationship with a preset threshold, and the second Determining whether to update the NAV according to a size relationship between a value in a duration Duration field carried by the PPDU and a current NAV value of the receiving end node of the first link, where the second PPDU includes: allowing transmission of CTS frames/enhanced The transmission of the ECTS frame, the reception of the acknowledgment ACK frame or the uplink data frame is allowed, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the step of determining the relationship between the current NAV values of the receiving end nodes of a link and determining whether to update the NAV includes:
  • the receiving end node of the first link updates the NAV to a value in the Duration field.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the receiving end node of the first link according to the first PPDU sent by the sending end node of the second link that is monitored, and the value in the duration Duration field carried in the first PPDU and the first
  • the size relationship between the current NAV values of the receiving end nodes of a link determines whether to update the NAV, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the receiving end node of the first link according to the first PPDU sent by the sending end node of the second link that is monitored, and the value in the duration Duration field carried in the first PPDU and the first
  • the step of determining the relationship between the current NAV values of the receiving end nodes of a link, and determining whether to update the NAV specifically:
  • the receiving end node of the first link is based on the first PPDU sent by the sending end node of the second link, and the value in the Duration field is greater than the receiving end node of the first link.
  • the current NAV value the receiving end node of the first link updates the NAV to a value in the Duration field.
  • the receiving end node of the first link according to the first PPDU sent by the sending end node of the second link that is monitored, and the value in the duration Duration field carried in the first PPDU and the first The relationship between the current NAV values of the receiving end nodes of a link, determining whether to update the NAV, and thereafter:
  • the receiving end node of the first link listens to the second PPDU sent by the receiving end node of the second link, the receiving end node of the first link receives the second PPDU according to the receiving The relationship between the power and the preset threshold determines whether the updated NAV is modified.
  • the step of determining, by the receiving end node of the first link, whether to modify the updated NAV according to the relationship between the received power of the second PPDU and the preset threshold specifically includes:
  • the receiving end node of the first link modifies the updated NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the receiving end node of the first link updates the NAV to a first time length according to the first PPDU sent by the sending end node of the second link, and the first time length is a second PPDU. And a sum of the transmission time and the short inter-frame interval SIFS, wherein the SIFS is between the receiving end node of the first link and the listening to the second PPDU time interval.
  • the receiving end node of the first link further includes:
  • the receiving end node of the first link listens to the second PPDU sent by the receiving end node of the second link, the receiving end node of the first link receives the second PPDU according to the receiving The relationship between the power and the preset threshold determines whether the updated NAV is modified.
  • the step of determining, by the receiving end node of the first link, whether to modify the updated NAV according to the relationship between the received power of the second PPDU and the preset threshold specifically includes:
  • the receiving end node of the first link modifies the updated NAV.
  • the step of the node of the first link updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU specifically includes:
  • the receiving end node of the first link listens to the trigger frame sent by the receiving end node of the second link, the receiving end node of the first link receives the received power corresponding to the trigger frame according to Determine the size of the preset threshold to determine whether to update the NAV.
  • the step of determining, by the receiving end node of the first link, whether to update the NAV according to the relationship between the received power corresponding to the triggering frame and the preset threshold specifically includes:
  • the receiving end node of the first link updates the NAV
  • the receiving end node of the first link keeps the set NAV not updated.
  • the receiving end node of the first link determines, according to the relationship between the received power corresponding to the trigger frame and the preset threshold, whether to update the NAV, and further includes:
  • the receiving end node of the first link listens to the first PPDU sent by the sending end node of the second link, and the receiving end node of the first link keeps the updated NAV unchanged.
  • the preset threshold is -82 dBm, any one of a clean channel evaluation CCA threshold, an overlapping basic service set packet detection threshold OBSS packet detection level, and signal sensitivity.
  • the method further includes:
  • the receiving end node of the first link modifies the NAV, when the receiving end node of the first link receives the data frame sent by the sending end node of the first link, the first link The receiving end node sends an ACK frame to the sending end node of the first link;
  • the receiving end node of the first link does not modify the NAV, when the receiving end node of the first link receives the data frame sent by the sending end node of the first link, the first link The receiving end node does not send the ACK frame to the transmitting end node of the first link.
  • an embodiment of the present invention provides an apparatus for updating or modifying a NAV, where the apparatus includes:
  • a monitoring unit located in a node of the first link, for monitoring a physical layer aggregation procedure protocol data unit PPDU sent by a node in the overlapping basic service set OBSS, where the node in the OBSS includes: a sending end node of the second link And the receiving end node of the second link,
  • the first link is a spatial reuse link
  • the second link is a link that is communicating;
  • an update or modification unit located in the node of the first link, for updating or modifying the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU.
  • the update or modification unit specifically includes: a first update or modification module
  • the first update or modification module is located in the sending end node of the first link, and is configured to: when the sending end node of the first link listens to the first PPDU sent by the sending end node of the second link
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the update or modification unit specifically includes: a first determining module:
  • the first determining module is located at a sending end node of the first link, and is configured to: when the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to Receiving a size relationship between the received power corresponding to the second PPDU and a preset threshold, and the second PPDU carries a size relationship between a value in a duration Duration field and a current NAV value, to determine whether to update the NAV,
  • the second PPDU includes: a CTS frame/enhanced permission to transmit an ECTS frame, an acknowledgement ACK frame or an uplink data frame, and the Duration field is used to indicate a length of the transmission opportunity duration TxOP.
  • the first determining module is located in the sending end node of the first link, specifically, when the receiving power corresponding to the receiving the second PPDU is greater than the preset threshold, and the second PPDU carries the persistent When the value in the time Duration field is greater than the current NAV value of the transmitting end node of the first link, the NAV is updated to be the value in the Duration field.
  • the first determining module is located in the sending end node of the first link, and is further configured to: according to the first PPDU sent by the sending end node of the monitored second link, and the carried in the first PPDU The size relationship between the value in the Duration field and the current NAV value determines whether to update the NAV, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the first determining module is located in the sending end node of the first link, and is specifically configured to be sent by the sending end node of the first link according to the monitored sending end node of the second link.
  • the first PPDU and when the value in the Duration field is greater than the current NAV value of the transmitting end node of the first link, the NAV is updated to be the value in the Duration field.
  • the first determining module is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link listens to the second sending by the receiving end node of the second link In the case of the PPDU, it is determined whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the first determining module is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is less than the preset threshold, modify the updated NAV.
  • the first update or modification module is located in the sending end node of the first link, and is specifically configured to update the NAV according to the first PPDU sent by the sending end node of the monitored second link.
  • a first time length where the first time length is a sum of a transmission time of the second PPDU and the short interframe space SIFS, where the SIFS is the first
  • the transmitting end node of a link listens to the time interval between the first PPDU and the second PPDU.
  • the first determining module is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link And determining whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the first determining module is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is less than the preset threshold, modify the updated NAV.
  • the first determining module is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link does not listen to the first PPDU sent by the sending end node of the second link, When the second PPDU sent by the receiving end node of the second link is monitored, the size relationship between the received power corresponding to the second PPDU and the preset threshold is received, and the duration of the second PPDU is carried.
  • the magnitude relationship between the value in and the current NAV value of the node of the first link determines whether to update the NAV.
  • the first determining module is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is greater than the preset threshold, and the second PPDU The NAV is updated when the value in the carried Duration Duration field is greater than the current NAV value of the node of the first link.
  • the first determining module is located at a sending end node of the first link, and is used to be When the sending end node of the first link listens to the triggering frame sent by the receiving end node of the second link, it determines whether to update the NAV according to the relationship between the received power corresponding to the triggering frame and the preset threshold. .
  • the first determining module is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the triggering frame is greater than the preset threshold, update the NAV;
  • the first determining module is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the triggering frame is not greater than the preset threshold, keep the set NAV not Update.
  • a first update or modification module located in the sending end node of the first link, configured to: when the sending end node of the first link listens to the first PPDU sent by the sending end node of the second link When the updated NAV is kept unchanged.
  • the updating or modifying unit specifically includes: a second determining module
  • the second determining module is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link only listens to the sending end node of the second link And the value of the received power corresponding to the second PPDU and the preset threshold value, and the value in the duration Duration field carried by the second PPDU, and the receiving end node of the first link.
  • the size relationship between the current NAV values determines whether to update the NAV, and the second PPDU includes: clearing the transmit CTS frame/enhanced allow-transmitting ECTS frame, and receiving the acknowledgement ACK frame.
  • the second determining module is located in the receiving end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is greater than the preset threshold And updating the NAV when the value in the duration Duration field carried by the second PPDU is greater than the current NAV value of the receiving end node of the first link.
  • the second update or modification unit specifically includes: a second update or modification module
  • the second update or modification module is located in the receiving end node of the first link, and is configured to: when the receiving end node of the first link listens to the sending end of the second link When a PPDU is maintained, the set NAV is not updated, and the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the second determining module is located in the receiving end node of the first link, when the receiving end node of the first link listens to the second PPDU sent by the receiving end of the second link. And according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU and the current state of the receiving end node of the first link Determining whether to update the NAV according to the size relationship between the NAV values, the second PPDU includes: allowing transmission of CTS frames/enhanced permission to transmit ECTS frames, receiving acknowledgement ACK frames or uplink data frames, and the Duration field is used to indicate transmission opportunities. Duration TxOP length.
  • the second determining module is located in the receiving end node of the first link, where specifically, when the receiving power corresponding to the receiving the second PPDU is greater than the preset threshold, and the carrying of the second PPDU is continued When the value in the time Duration field is greater than the current NAV value of the receiving end node of the first link, the NAV is updated to be the value in the Duration field.
  • a second determining module located in the receiving end node of the first link, configured to receive, according to the first PPDU sent by the sending end node of the second link, and the persistent carried in the first PPDU a value in the time Duration field and the first link
  • the size relationship between the current NAV values of the receiving end node determines whether to update the NAV, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the second determining module is located at the receiving end node of the first link, and is specifically configured to be used by the receiving end node of the first link according to the monitored sending end node of the second link A PPDU, and when the value in the Duration field is greater than the current NAV value of the receiving end node of the first link, the NAV is updated to be the value in the Duration field.
  • the second determining module is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the second end sent by the receiving end node of the second link In the case of the PPDU, it is determined whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the second determining module is located in the receiving end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is less than the preset threshold, modify the updated NAV.
  • a second update or modification module located in the receiving end node of the first link, for updating the NAV to the first time according to the first PPDU sent by the sending end node of the second link that is monitored
  • the length of the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is that the receiving end node of the first link listens to the first PPDU and The time interval between the two PPDUs is monitored.
  • the second determining module is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the second end sent by the receiving end node of the second link In the case of the PPDU, it is determined whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the second determining module is located in the receiving end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is less than the preset threshold, modify the updated NAV.
  • the second determining module is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the trigger frame sent by the receiving end node of the second link, Determining whether to update the NAV according to the relationship between the received power corresponding to the trigger frame and the preset threshold.
  • the second determining module is located in the receiving end node of the first link, specifically, when the receiving power corresponding to the receiving the trigger frame is greater than the preset threshold, updating the NAV;
  • the second determining module is located in the receiving end node of the first link, and is specifically configured to: when the received power corresponding to the receiving the trigger frame is not greater than the preset threshold, keep the set NAV not Update.
  • the second update or modification module is located in the receiving end node of the first link, and is further configured to monitor the first PPDU sent by the sending end node of the second link, where the first link is The receiving end node keeps the updated NAV unchanged.
  • the preset threshold is -82 dBm, any one of a clean channel evaluation CCA threshold, an overlapping basic service set packet detection threshold OBSS packet detection level, and signal sensitivity.
  • the device further includes: a transmitting unit;
  • the sending unit is located in the receiving end node of the first link, when the receiving end node of the first link modifies the NAV, and when the receiving end node of the first link receives Sending an ACK frame to the sending end node of the first link when the data frame is sent to the sending end node of the first link;
  • the sending unit is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link does not modify the NAV, and when the receiving end node of the first link receives When the data frame sent by the transmitting end node of the first link does not send the ACK frame to the transmitting end node of the first link.
  • an embodiment of the present invention provides an apparatus for updating or modifying a NAV, including:
  • a processor located in a node of the first link, for monitoring a physical layer aggregation procedure protocol data unit PPDU sent by a node in the overlapping basic service set OBSS, where the node in the OBSS includes: a sending end node of the second link And a receiving end node of the second link, the first link is a space reuse link, and the second link is a link that is communicating;
  • the processor is located in a node of the first link, and is configured to update or modify a network allocation vector NAV according to the PPDU, and/or the received power of the PPDU.
  • the processor is located in the sending end node of the first link, and is specifically configured to: when the sending end node of the first link listens to the first PPDU sent by the sending end node of the second link, The set NAV is not updated, and the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the processor is located at a sending end node of the first link, and is specifically configured to: when the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to the receiving a relationship between the received power of the second PPDU and a preset threshold, and the second PPDU carries a size relationship between a value in the duration Duration field and a current NAV value, and determines whether to update the NAV.
  • the second PPDU includes: allowing transmission of a CTS frame/enhanced permission to transmit an ECTS frame, receiving an acknowledgement ACK frame or an uplink data frame, and the Duration field is used to indicate a length of the transmission opportunity duration TxOP.
  • the processor is located in the sending end node of the first link, specifically, when the receiving power corresponding to the receiving the second PPDU is greater than the preset threshold, and the second PPDU carries a duration Duration When the value in the field is greater than the current NAV value of the transmitting end node of the first link, the NAV is updated to be the value in the Duration field.
  • the processor is located in the sending end node of the first link, and is further configured to: according to the first PPDU sent by the sending end node of the second link that is monitored, and the carried in the first PPDU
  • the size relationship between the value in the Duration field and the current NAV value determines whether to update the NAV, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the processor is located in the sending end node of the first link, and is specifically configured to: when the sending end node of the first link sends the first according to the monitored sending end node of the second link When the PPDU, and the value in the Duration field is greater than the current NAV value of the transmitting end node of the first link, the NAV is updated to be the value in the Duration field.
  • the processor is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link And determining whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the processor is located in the sending end node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than the preset threshold.
  • the processor is located in the sending end node of the first link, and is configured to update the NAV to the first time length according to the first PPDU sent by the sending end node of the second link that is monitored.
  • the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is that the sending end node of the first link listens to the first PPDU and listens The time interval between the two to the second PPDU.
  • the processor is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to And receiving a size relationship between the received power corresponding to the second PPDU and a preset threshold, and determining whether to modify the updated NAV.
  • the processor is located in the sending end node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than the preset threshold. .
  • the processor is located in the sending end node of the first link, and is further configured to: when the sending end node of the first link does not listen to the first PPDU sent by the sending end node of the second link, When the second PPDU sent by the receiving end node of the second link is monitored, the size relationship between the received power corresponding to the second PPDU and the preset threshold is received, and the duration of the second PPDU is carried.
  • the magnitude relationship between the value in and the current NAV value of the node of the first link determines whether to update the NAV.
  • the processor is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is greater than the preset threshold, and the second PPDU is carried
  • the NAV is updated when the value in the duration Duration field is greater than the current NAV value of the node of the first link.
  • the processor is located at a sending end node of the first link, and is configured to receive, when the sending end node of the first link listens to a trigger frame sent by the receiving end node of the second link, The relationship between the received power corresponding to the trigger frame and the preset threshold determines whether to update the NAV.
  • the processor is located in the sending end node of the first link, and is specifically configured to: when the received power corresponding to the triggering frame is greater than the preset threshold, update the NAV;
  • the processor is located in the sending end node of the first link, and is configured to keep the set NAV from being updated when the received power corresponding to the triggering frame is not greater than the preset threshold.
  • the processor is located in a sending end node of the first link, and is also used in the When the transmitting end node of the first link listens to the first PPDU sent by the sending end node of the second link, the updated NAV is not modified.
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link only listens to the second PPDU sent by the receiving end node of the second link And according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU and the current NAV of the receiving end node of the first link.
  • the size relationship between the values determines whether to update the NAV, and the second PPDU includes: clearing the transmit CTS frame/enhanced allow-transmitting ECTS frame, and receiving the acknowledgement ACK frame.
  • the processor is located in the receiving end node of the first link, and is specifically configured to: when the received power corresponding to the second PPDU is greater than the preset threshold, and the second PPDU is carried
  • the NAV is updated when the value in the duration Duration field is greater than the current NAV value of the receiving end node of the first link.
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the first PPDU sent by the sending end node of the second link And keeping the set NAV from being updated, the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the second PPDU sent by the receiving end of the second link, And according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU and the current NAV of the receiving end node of the first link Determining whether to update the NAV, the second PPDU includes: allowing transmission of CTS frames/enhanced The transmission of the ECTS frame, the reception of the acknowledgment ACK frame or the uplink data frame is allowed, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the processor is located in the receiving end node of the first link, specifically, when the receiving power corresponding to the receiving the second PPDU is greater than the preset threshold, and the duration of the second PPDU is carried.
  • the NAV is updated to be the value in the Duration field.
  • the processor is located in the receiving end node of the first link, and is further configured to: according to the first PPDU sent by the sending end node of the second link that is monitored, and the carried in the first PPDU And determining, by the size relationship between the value in the duration Duration field and the current NAV value of the receiving end node of the first link, whether the NAV is updated, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the processor is located at a receiving end node of the first link, and is specifically configured to: when the receiving end node of the first link is sent according to the first PPDU sent by the sending end node of the second link that is monitored And updating the NAV to a value in the Duration field when the value in the Duration field is greater than the current NAV value of the receiving end node of the first link.
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the second PPDU sent by the receiving end node of the second link And determining whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the processor is located in the receiving end node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than the preset threshold. .
  • the processor is located in the receiving end node of the first link, and is further configured to update the NAV to the first time length according to the first PPDU sent by the sending end node of the second link that is monitored.
  • the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is that the receiving end node of the first link listens to the first PPDU and listens The time interval between the two to the second PPDU.
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the second PPDU sent by the receiving end node of the second link And determining whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the processor is located in the receiving end node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than the preset threshold. .
  • the processor is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link listens to the trigger frame sent by the receiving end node of the second link, Determining whether to update the NAV according to the relationship between the received power corresponding to the trigger frame and the preset threshold.
  • the processor is located in the receiving end node of the first link, specifically, when the receiving power corresponding to the receiving the trigger frame is greater than the preset threshold, updating the NAV;
  • the processor is located in the receiving end node of the first link, and is configured to keep the set NAV from being updated when the received power corresponding to the triggering frame is not greater than the preset threshold.
  • the processor located in the receiving end node of the first link, is further configured to listen to the first PPDU sent by the sending end node of the second link, and the receiving end node of the first link Keep the updated NAV unchanged.
  • the preset threshold is -82 dBm, any one of a clean channel evaluation CCA threshold, an overlapping basic service set packet detection threshold OBSS packet detection level, and signal sensitivity.
  • the device also includes: a transceiver;
  • the transceiver is located in the receiving end node of the first link, when the receiving end node of the first link modifies the NAV, and when the receiving end node of the first link receives Sending an ACK frame to the sending end node of the first link when the data frame is sent to the sending end node of the first link;
  • the transceiver is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link does not modify the NAV, and when the receiving end node of the first link receives When the data frame sent by the transmitting end node of the first link does not send the ACK frame to the transmitting end node of the first link.
  • the point first listens to the physical layer aggregation procedure protocol data unit PPDU sent by the node in the overlapping basic service set OBSS, wherein the node in the OBSS comprises: a sending end node of the second link and a receiving end node of the second link, first The link is a spatial reuse link, the second link is a link that is communicating, and then the network allocation vector NAV is updated or modified according to the PPDU, and/or the received power of the PPDU.
  • the node of the spatial reuse link of the present invention transmits according to whether the PPDU transmitted by the transmitting end node of the link in which the communication is being received and the receiving end node of the communicating link are received.
  • PPDU may update or modify the NAV according to the received power corresponding to the PPDU sent by the transmitting end node of the link that is communicating or the receiving end node of the communicating link, instead of when the transmitting end node of the spatial reuse link
  • the threshold is less than the preset threshold, the NAV can be updated or modified, so that the node of the spatial reuse link can be updated or the probability of modifying the NAV can be reduced, thereby improving the chance of spatial reuse data transmission.
  • FIG. 1 is a flowchart of a method for updating or modifying a NAV according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another method for updating or modifying a NAV according to an embodiment of the present invention
  • FIG. 3 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of updating or modifying an NAV according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of still another method for updating or modifying an NAV according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of another update or modification of a NAV according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 12 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 13 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of another update or modification of a NAV according to an embodiment of the present invention.
  • FIG. 15 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 16 is a flowchart of still another method for updating or modifying an NAV according to an embodiment of the present invention.
  • FIG. 17 is still another schematic diagram of updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 18 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 19 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 21 is still another schematic diagram of updating or modifying an NAV according to an embodiment of the present invention.
  • FIG. 22 is a flowchart of still another method for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 23 is a schematic diagram of an apparatus for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 24 is a schematic diagram of another apparatus for updating or modifying a NAV according to an embodiment of the present invention.
  • FIG. 25 is a schematic structural diagram of another update or modification of a NAV according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method for updating or modifying an NAV, which can improve an opportunity for SR data transmission. As shown in FIG. 1, the method includes:
  • the node of the first link listens to a physical layer convergence procedure protocol data unit PPDU sent by a node in the overlapping basic service set OBSS.
  • the node in the overlapping basic service set (English full name: overlap basic service set, English abbreviation: OBSS) includes: a transmitting end node of the second link and a receiving end node of the second link, and the first link is space reuse.
  • the link, the second link is the link that is communicating.
  • the node of the second link includes: a sending end node of the existing ongoing link and a receiving end node of the ongoing link, and the ingoing link is a link that is communicating.
  • the second link can be transmitted in parallel under certain conditions, and the second link is an SR link.
  • the link that first contends to the channel is the ongoing link.
  • the transmitting end node and the receiving end node of the SR link and the transmitting end node and the receiving end node of the ongoing link are located in two different basic service sets that overlap.
  • the node of the first link updates or modifies the network allocation vector NAV according to the PPDU, and/or the received power of the PPDU.
  • the NAV is used in virtual carrier monitoring, and its function is equivalent to a counter, wherein the NAV is used to virtualize the busy and idle channels, wherein the NAV is not busy and 0 is idle.
  • the NAV is modified to reset the NAV to 0, wherein the update NAV does not allow parallel transmission for the time set by the NAV, and resets the NAV to 0, indicating that the link can be transmitted in parallel.
  • the SR link sending end node according to whether to listen to the PPDU sent by the ongoing link transmitting end node and/or the ingoing link receiving end node in the OBSS, and when receiving the oosing link sending end node in the OBSS And/or the PPDU sent by the node of the ongoing link receiving end may determine whether to update according to the received power of the PPDU sent by the sending node of the ongoing link and/or the receiving power corresponding to the PPDU sent by the receiving end node of the ongoing link. Or modify the NAV.
  • modifying the NAV is to reset the NAV to zero or to modify the NAV to a value prior to the update.
  • the value before the update is a value corresponding to the NAV of the node of the first link before the node of the first link receives the PPDU sent by the node of the second link.
  • a method for updating or modifying a NAV provided by an embodiment of the present invention, spatially multiplexing an SR chain
  • the transmitting end node of the path first listens to the physical layer aggregation process protocol data unit PPDU sent by the node in the overlapping basic service set OBSS, and the nodes in the OBSS include: the transmitting end node of the existing ongoing link and the receiving end node of the ongoing link, Then, the network allocation vector NAV is updated or modified according to the PPDU sent by the transmitting end node of the monitored ongoing link and the receiving end node of the ongoing link, and/or the received power of the PPDU.
  • the transmitting end node of the SR link can receive the PPDU sent by the transmitting end of the ongoing link and the PPDU sent by the receiving end of the ingoing link, and can receive according to the receiving.
  • the probability that the link sender updates or modifies the NAV can increase the chance of SR data transmission.
  • step 102 the node of the first link updates or modifies the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • step 201 shown in FIG. 2 is included.
  • the sending end node of the first link keeps the set NAV not updated.
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • step 201 if the node of the first link listens to the first PPDU sent by the sending end node of the second link, The transmitting end node of the first link maintains the step that the set NAV is not updated, and then includes step 301 as shown in FIG.
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, the node of the first link according to the size relationship between the received power corresponding to the second PPDU and the preset threshold And the second PPDU carries a size relationship between the value in the duration Duration field and the current NAV value to determine whether to update the NAV.
  • the second PPDU includes: allowing the CTS frame to be sent, receiving the acknowledgement ACK frame or the uplink data frame, and the Duration field is used to indicate the length of the transmission opportunity duration (English full name: transmission opportunity, English abbreviation: TxOP), where TXOP
  • TxOP transmission opportunity duration
  • the preset threshold is -82 dBm, the clear channel assessment (English name: Clear Channel Assessment, abbreviation: CCA) threshold, the overlapping basic service packet detection threshold OBSS packet detection level, and the signal sensitivity.
  • CCA Clear Channel Assessment
  • the transmitting end node of the first link when the transmitting end node of the first link first listens to the first PPDU sent by the sending end node of the second link, the sending end node of the first link maintains the updated NAV, and then listens When the second PPDU is sent to the receiving end node of the second link, the transmitting end node of the first link determines whether to update the NAV according to the received power corresponding to the second PPDU.
  • the first PPDU may be an RTS
  • the second PPDU may confirm a character (English full name: Acknowledgement, English abbreviation: ACK).
  • ACK English abbreviation: ACK
  • the transmitting end node of the first link receives the RTS sent by the second link sending end, Update and not modify the NAV.
  • the transmitting end node of the first link receives the CTS sent by the second link receiving end node, it determines whether to update or modify the NAV according to the receiving power corresponding to the receiving CTS.
  • step 301 if the node of the first link listens to the second PPDU sent by the receiving end node of the second link, The node of the first link determines, according to the relationship between the received power corresponding to the second PPDU and the preset threshold, and the size relationship between the value of the duration and the current NAV value carried by the second PPDU. Updating the NAV may specifically include step 401 as shown in FIG.
  • the node of the first link listens to the second PPDU sent by the second link receiving end in the OBSS, the receiving power corresponding to the receiving the second PPDU is greater than a preset threshold, and the second PPDU carries the duration Duration.
  • the node update NAV of the first link is the value in the Duration field.
  • the node of the first link listens to the second PPDU sent by the second link receiving end in the OBSS, the receiving power corresponding to the receiving the second PPDU is greater than
  • the threshold is preset, and the second PPDU carries the current NAV value of the node in the duration Duration field that is not greater than the first link, the node of the first link does not update the NAV.
  • the node of the first link listens to the second PPDU sent by the second link receiving end, if the receiving power corresponding to the second PPDU is not greater than a preset threshold, the node of the first link Do not update NAV.
  • the node of the first link listens to the first PPDU sent by the sending end node of the second link, the node of the first link does not update the NAV, and if the receiving end of the second link is monitored, The second PPDU sent by the node determines whether the NAV is updated according to the received power of the second PPDU, as shown in FIG. 5 .
  • step 102 the node of the first link updates or modifies the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • the method includes the step 601 shown in FIG. 6.
  • the node of the first link is based on the first PPDU sent by the sending end node of the monitored second link, and the relationship between the value in the duration Duration field carried in the first PPDU and the current NAV value. Determine if you want to update NAV.
  • the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the node of the first link is configured according to the first PPDU sent by the sending end node of the second link that is monitored, And determining a size relationship between the value in the duration duration field carried in the first PPDU and the current NAV value, and determining whether to update the NAV, specifically including step 701 shown in FIG. 7.
  • the node of the first link is based on the first PPDU sent by the sending end node of the monitored second link, and the value in the Duration field is greater than the current NAV value of the node of the first link, the first link The node updates the NAV to the value in the Duration field.
  • the node of the first link is based on the first PPDU sent by the sending end node of the monitored second link, and the value in the Duration field is not greater than the current NAV value of the node of the first link, Then the node of the first link does not update the NAV value.
  • step 701 if the node of the first link is according to the sent end of the monitored second link, The first PPDU sent by the node, and the value in the Duration field is greater than the current NAV value of the node of the first link, then the node update NAV of the first link is the value in the Duration field, and then includes the value shown in FIG. Step 801.
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, the node of the first link according to the size relationship between the received power corresponding to the second PPDU and the preset threshold , to determine whether to modify the updated NAV.
  • modifying the updated NAV is to reset the NAV to 0 or to modify the NAV to a value prior to the update.
  • the value before the update is a value corresponding to the NAV of the node of the first link before the node of the first link receives the first PPDU sent by the sending end node of the second link.
  • step 801 if the node of the first link listens to the second PPDU sent by the receiving end node of the second link, The node of the first link determines whether to modify the updated NAV according to the relationship between the received power of the second PPDU and the preset threshold, and specifically includes the step 901 shown in FIG. 9 .
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, when the received power corresponding to the second PPDU is less than a preset threshold, the node modification of the first link is updated. After the NAV.
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, the receiving power corresponding to the second PPDU received by the node of the first link is not less than the preset.
  • the node of the first link maintains the updated NAV without modification.
  • the node of the first link modifies the updated NAV to reset the updated NAV to 0 or modify the updated NAV to a value before the update.
  • the value before the update is a value corresponding to the NAV of the node of the first link before the node of the first link receives the first PPDU sent by the sending end node of the second link.
  • the NAV of the first link corresponds to a value of 2, and after the update, the value of the NAV is 5, when receiving the first
  • the node of the first link resets the NAV to 0 or modifies the NAV to receive the second link.
  • the value before the first PPDU sent by the sending end node is 2.
  • the node of the first link determines whether to update the NAV according to the size relationship between the value in the duration Duration field carried in the RTS frame and the current NAV value according to the RTS frame sent by the sending end node of the second link. Then, the node of the first link determines whether to modify the NAV according to the relationship between the received power corresponding to the CTS frame sent by the receiving end node of the second link and the preset threshold.
  • the node of the first link listens to the first PPDU sent by the sending end node of the second link, the node of the first link according to the value in the Duration field carried by the first PPDU and the current NAV.
  • the relationship between the values determines whether to update the NAV. If the second PPDU sent by the receiving end node of the second link is monitored, the node of the first link determines whether to modify the NAV according to the received power of the second PPDU. As shown in Figure 10.
  • step 102 the node of the first link updates or modifies the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • the method includes the step 1101 shown in FIG.
  • the node of the first link updates the NAV to a first time length according to the first PPDU sent by the sending end node of the monitored second link.
  • the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is the time interval between the node listening to the first link and the second PPDU being monitored by the node of the first link. .
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • step 1101 the node of the first link is configured according to the first PPDU sent by the sending end node of the monitored second link,
  • the NAV is updated to a first length of time, followed by step 1201 as shown in FIG.
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, the node of the first link according to the size relationship between the received power corresponding to the second PPDU and the preset threshold , to determine whether to modify the updated NAV.
  • the second PPDU includes: allowing a CTS frame to be sent, receiving an acknowledgement ACK frame, or Upstream data frame.
  • modifying the updated NAV is to reset the NAV to 0 or modify the NAV to a value before the update.
  • the value before the update is a value corresponding to the NAV of the node of the first link before the node of the first link receives the first PPDU sent by the sending end node of the second link.
  • step 1201 if the node of the first link listens to the second PPDU sent by the receiving end node of the second link, The node of the first link determines whether to modify the updated NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold, and specifically includes the step 1301 shown in FIG.
  • the node modification of the first link is updated when the received power corresponding to the second PPDU is less than a preset threshold. After the NAV.
  • the node of the first link listens to the second PPDU sent by the receiving end node of the second link, the first link is received when the received power corresponding to the second PPDU is not less than a preset threshold.
  • the node does not modify the updated NAV.
  • the node of the first link listens to the first PPDU sent by the sending end node of the second link
  • the node update NAV of the first link is the transmission time and short interframe space of the second PPDU.
  • the sum of the two SIFSs if the second PPDU sent by the receiving end node of the second link is monitored, the node of the first link determines whether to modify the NAV according to the received power of the second PPDU, as shown in FIG. .
  • step 102 the node of the first link updates or modifies the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • the method includes the step 1501 shown in FIG.
  • the node of the first link Determining whether to update according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the relationship between the value in the duration Duration field carried by the second PPDU and the current NAV value of the node of the first link. NAV.
  • step 1501 if the node of the first link does not listen to the first PPDU sent by the sending end node of the second link, If the second PPDU sent by the receiving end node of the second link is only monitored, the node of the first link determines whether to update the NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold. Step 1601 as shown in FIG. 16 is included.
  • the node update of the first link is performed. NAV.
  • the node of a link maintains the set NAV and does not update the NAV.
  • the node of the first link when the node of the first link receives only the second PPDU sent by the receiving end node of the second link, and does not listen to the first PPDU sent by the sending end node of the second link, The node of a link determines whether to update the NAV according to the received power of the second PPDU and the value of the value in the duration Duration field carried by the second PPDU and the current NAV value of the node of the first link, as shown in the figure. 17 is shown.
  • step 102 the node of the first link updates or modifies the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • the method includes the step 1801 shown in FIG. 18.
  • the sending end node of the first link listens to the triggering frame sent by the receiving end node of the second link, the sending end node of the first link according to the received power of the receiving triggering frame and the preset threshold , to determine whether to update the NAV.
  • the trigger frame is sent by the receiving end node of the second link
  • the node of the first link can listen to the trigger frame sent by the receiving end node of the second link
  • the node of the first link is The relationship between the received power of the trigger frame and the preset threshold is received to determine whether to update the NAV.
  • the preset threshold is -82dBm
  • the clean channel evaluates the CCA threshold
  • the overlap is basically The service set packet detection threshold OBSS packet detection level and signal sensitivity.
  • step 1801 if the node of the first link listens to the trigger frame sent by the receiving end node of the second link, The node of a link determines whether to update the NAV according to the relationship between the received power corresponding to the received trigger frame and the preset threshold, and specifically includes steps 1901-1902 as shown in FIG.
  • the node of the first link listens to the trigger frame sent by the receiving end node of the second link, when the receiving power corresponding to the receiving trigger frame is greater than a preset threshold, the node of the first link updates the NAV.
  • the preset threshold is -82 dBm, and when the received power corresponding to the received trigger frame is -80 dBm, the node of the first link updates the NAV.
  • the node of the first link listens to the trigger frame sent by the receiving end node of the second link, when the receiving power corresponding to the receiving trigger frame is not greater than a preset threshold, the node of the first link remains set. NAV is not updated.
  • the preset threshold is -82 dBm, and when the received power corresponding to the received trigger frame is -85 dBm, the node of the first link keeps the set NAV not updated.
  • step 181 if the node of the first link listens to the trigger frame sent by the receiving end node of the second link, Then, the node of the first link determines whether to update the NAV according to the relationship between the received power corresponding to the received trigger frame and the preset threshold, and then includes step 2001 shown in FIG. 20 .
  • the node of the first link listens to the first PPDU sent by the sending end node of the second link, the node of the first link keeps the updated NAV unchanged.
  • the node of the first link when the node of the first link receives the trigger frame sent by the receiving end node of the second link, the node of the first link determines whether to update the NAV according to the received power of receiving the trigger frame, and then When the node of the first link receives the first PPDU sent by the sending end node of the second link, the updated NAV is kept unchanged, as shown in FIG. 21.
  • Another possible implementation manner of the embodiment of the present invention further includes steps 2201-2202 as shown in FIG.
  • the receiving end node of the first link receives the sending end of the first link.
  • the receiving end node of the first link sends an ACK frame to the sending end node of the first link.
  • the receiving end node of the first link when the receiving end node of the first link resets the NAV to 0, and the receiving end node of the first link receives the data node of the sending end node of the first link, the first link The receiving end node sends an ACK frame to the transmitting end node of the first link.
  • the node of the first link is the receiving end node of the first link, and the receiving end node of the first link does not modify the NAV, when the receiving end node of the first link receives the sending of the first link When the data frame is sent by the end node, the receiving end node of the first link does not send an ACK frame to the sending end node of the first link.
  • the receiving end node of the first link does not modify the NAV, and the receiving end node of the first link updates the NAV and the receiving end node of the first link maintains the set NAV.
  • the NAV when the receiving end node of the first link only updates the NAV, the NAV is not reset to 0, and the receiving end node of the first link receives the sending of the sending end node of the first link. In the case of a data frame, the receiving end node of the first link does not send an ACK frame to the transmitting end node of the first link.
  • an embodiment of the present invention further provides an apparatus for updating or modifying a NAV, which is used to improve transmission opportunities of SR data.
  • the apparatus includes: The listening unit 2301 updates or modifies the unit 2302.
  • the monitoring unit 2301 is located in the node of the first link, and is configured to listen to the physical layer convergence process protocol data unit PPDU sent by the node in the overlapping basic service set OBSS.
  • the node in the OBSS includes: a sending end node of the second link and a receiving end node of the second link, the first link is a space reuse link, and the second link is a link that is communicating.
  • the update or modification unit 2302 is located in the node of the first link for updating or modifying the network allocation vector NAV according to the received power of the PPDU, and/or the PPDU.
  • the update or modification unit 2302 specifically includes: a first update or modification module 23021;
  • the first update or modification module 23021 is located in the node of the first link, and is configured to keep the set NAV not updated when the node of the first link listens to the first PPDU sent by the sending end node of the second link. .
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the update or modification unit 2302 specifically includes: a first determining module 23022.
  • the first determining module 23022 is located at a node of the first link, and is configured to: when the sending end node of the first link does not listen to the first PPDU sent by the sending end node of the second link, only the second link is monitored. Receiving the second PPDU sent by the end node, according to the size relationship between the received power corresponding to the second PPDU and the preset threshold, and the value in the duration Duration field carried by the second PPDU and the current NAV of the node of the first link. The size relationship between the values determines whether the NAV is updated.
  • the second PPDU includes: allowing to send a CTS frame/enhanced to allow transmission of an ECTS frame, receiving an acknowledgement ACK frame or an uplink data frame, and the Duration field is used to indicate a length of the transmission opportunity duration TxOP.
  • the preset threshold is -82 dBm, the clean channel evaluation CCA threshold, the overlapping basic service packet detection threshold OBSS packet detection level, and the signal sensitivity.
  • the first determining module 23022 is located in the node of the first link, where the receiving power corresponding to the receiving the second PPDU is greater than a preset threshold, and the value of the second PPDU carrying the duration Duration field is greater than the first link.
  • the NAV is updated to the value in the Duration field.
  • the first determining module 23022 is located in the node of the first link, and is further configured to: according to the first PPDU sent by the sending end node of the monitored second link, and the value in the duration Duration field carried in the first PPDU. Determine the update NAV with the size relationship between the current NAV value, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP. degree.
  • the first determining module 23022 is located in the node of the first link, and is specifically configured to: when the node of the first link is sent according to the first PPDU sent by the sending end node of the monitored second link, and the value in the Duration field is greater than When the current NAV value of the node of the first link is updated, the NAV is updated to the value in the Duration field.
  • the first determining module 23022 is located in the node of the first link, and is further configured to receive, according to the second PPDU, when the node of the first link listens to the second PPDU sent by the receiving end node of the second link. Determines whether to modify the updated NAV by the relationship between the power and the preset threshold.
  • the first determining module 23022 is located in the node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than a preset threshold.
  • the first update or modification module is located in the node of the first link, and is specifically configured to update the NAV to the first time length according to the first PPDU sent by the sending end node of the monitored second link.
  • the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is the time interval between the node listening to the first link and the second PPDU being monitored by the node of the first link. .
  • the first determining module 23022 is located in the node of the first link, and is further configured to receive, according to the second PPDU, when the node of the first link listens to the second PPDU sent by the receiving end node of the second link.
  • the relationship between the power and the preset threshold determines whether the updated NAV is modified.
  • the first determining module 23022 is located in the node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than a preset threshold.
  • the first determining module 23022 is located in the node of the first link, and is further configured to: when the node of the first link does not listen to the first PPDU sent by the sending end node of the second link, only the second link is monitored. When receiving the second PPDU sent by the end node, determining whether to update the NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the first determining module 23022 is located in the node of the first link, and is specifically used to connect When the received power corresponding to the second PPDU is greater than a preset threshold, the NAV is updated.
  • the first determining module 23022 is located at a node of the first link, and is configured to: when the node of the first link listens to the trigger frame sent by the receiving end node of the second link, according to the received power and preset corresponding to the receiving trigger frame. The size relationship of the thresholds to determine whether to update the NAV.
  • the first determining module 23022 is located in the node of the first link, and is specifically configured to: when the received power corresponding to the receiving trigger frame is greater than a preset threshold, update the NAV.
  • the first determining module 23022 is located in the node of the first link, and is configured to keep the set NAV from being updated when the received power corresponding to the receiving trigger frame is not greater than a preset threshold.
  • the first update or modification module is located in the node of the first link, and is used to keep the updated NAV unchanged when the node of the first link listens to the first PPDU sent by the sending end node of the second link. .
  • the apparatus further includes: a transmitting unit 2401.
  • the sending unit 2401 is located in the receiving end node of the first link, when the receiving end node of the first link modifies the NAV, and when the receiving end node of the first link receives the sending end node of the first link When the data frame is transmitted, an ACK frame is sent to the transmitting end node of the first link.
  • the sending unit 2401 is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link does not modify the NAV, and when the receiving end node of the first link receives the sending of the first link When the data frame is sent by the end node, the ACK frame is not sent to the sending end node of the first link.
  • the node of the first link firstly listens to the physical layer convergence process protocol data unit PPDU sent by the node in the overlapping basic service set OBSS, wherein the node in the OBSS includes: The transmitting end node of the link and the receiving end node of the second link, the first link is a spatial reuse link, the second link is a link that is communicating, and then according to the received power of the PPDU, and/or the PPDU, Update or modify the network allocation vector NAV.
  • the node of the spatial reuse link is based on whether the PPDU sent by the transmitting end node of the link in which communication is being received and the link being communicated are received.
  • the NAV can be updated or modified, thereby reducing the probability of node update of the spatial reuse link or modifying the NAV, thereby improving the chance of spatial reuse data transmission.
  • the embodiment of the present invention further provides an apparatus for updating or modifying a NAV.
  • the apparatus includes: a processor 2501, a transceiver 2502, and a memory 2503.
  • the processor 2501 passes through a data bus and a memory 2503. It is connected to the transceiver 2502.
  • the processor 2501 is located in a node of the first link, and is configured to listen to a physical layer aggregation procedure protocol data unit PPDU sent by a node in the overlapping basic service set OBSS.
  • the node in the OBSS includes: a sending end node of the second link and a receiving end node of the second link, the first link is a space reuse link, and the second link is a link that is communicating.
  • the processor 2501 is located in a node of the first link, and is configured to update or modify the network allocation vector NAV according to the received power of the PPDU and/or the PPDU.
  • the processor 2501 is located in the node of the first link, and is configured to keep the set NAV from being updated when the node of the first link listens to the first PPDU sent by the sending end node of the second link.
  • the first PPDU includes: requesting to send an RTS frame and a data Data frame.
  • the processor 2501 is located at a node of the first link, and is specifically configured to: when the node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to the received power and the pre-received corresponding to the second PPDU The magnitude relationship between the thresholds is set, and the second PPDU carries a size relationship between the value in the duration Duration field and the current NAV value to determine whether to update the NAV.
  • the second PPDU includes: allowing to send a CTS frame/enhanced to allow transmission of an ECTS frame, receiving an acknowledgement ACK frame or an uplink data frame, and the Duration field is used to indicate a length of the transmission opportunity duration TxOP.
  • the preset threshold is -82 dBm, and the clean channel evaluation CCA threshold, the overlapping basic service packet detection threshold OBSS packet detection level, and the signal sensitivity.
  • the processor 2501 is located in a node of the first link, where the receiving power corresponding to the receiving the second PPDU is greater than a preset threshold, and the second PPDU carries a node whose value in the duration Duration field is greater than the first link. When the current NAV value is updated, the NAV is updated to the value in the Duration field.
  • the processor 2501 is located in the node of the first link, and is further configured to: according to the first PPDU sent by the sending end node of the monitored second link, and the value in the duration Duration field carried in the first PPDU, and the current The size relationship between the NAV values determines whether the NAV is updated, and the Duration field is used to indicate the length of the transmission opportunity duration TxOP.
  • the processor 2501 is located in a node of the first link, and is specifically configured to: when the node of the first link is sent according to the first PPDU sent by the sending end node of the monitored second link, and the value in the Duration field is greater than the first When the current NAV value of the node of the link is updated, the NAV is updated to the value in the Duration field.
  • the processor 2501 is located in the node of the first link, and is further configured to: when the node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to the received power corresponding to the second PPDU received The size relationship between the preset thresholds determines whether the updated NAV is modified.
  • the processor 2501 is located in the node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than a preset threshold.
  • the processor 2501 is located in a node of the first link, and is configured to update the NAV to a first time length according to the first PPDU sent by the sending end node of the monitored second link.
  • the first time length is the sum of the transmission time of the second PPDU and the short inter-frame interval SIFS, and the SIFS is the time interval between the node listening to the first link and the second PPDU being monitored by the node of the first link. .
  • the processor 2501 is located in the node of the first link, and is further configured to: when the node of the first link listens to the second PPDU sent by the receiving end node of the second link, according to the received power corresponding to the second PPDU received The size relationship between the preset thresholds determines whether the updated NAV is modified.
  • the processor 2501 is located in the node of the first link, and is specifically configured to modify the updated NAV when the received power corresponding to the second PPDU is less than a preset threshold.
  • the processor 2501 is located in the node of the first link, and is further configured to: when the node of the first link does not listen to the first PPDU sent by the sending end node of the second link, only the receiving end of the second link is monitored. When the second PPDU is sent by the node, it is determined whether to update the NAV according to the relationship between the received power corresponding to the second PPDU and the preset threshold.
  • the processor 2501 is located in a node of the first link, and is specifically configured to update the NAV when the received power corresponding to the second PPDU is greater than a preset threshold.
  • the processor 2501 is located at a node of the first link, and is configured to: when the node of the first link listens to the trigger frame sent by the receiving end node of the second link, according to the received power corresponding to the received trigger frame and the preset threshold Size relationship to determine whether to update NAV.
  • the processor 2501 is located in the node of the first link, and is specifically configured to update the NAV when the received power corresponding to the received trigger frame is greater than a preset threshold.
  • the processor 2501 is located in the node of the first link, and is configured to keep the set NAV from being updated when the received power corresponding to the receiving trigger frame is not greater than a preset threshold.
  • the processor 2501 is located in the node of the first link, and is further configured to keep the updated NAV from being modified when the node of the first link listens to the first PPDU sent by the sending end node of the second link.
  • the transceiver 2502 is located in the receiving end node of the first link, when the receiving end node of the first link modifies the NAV, and when the receiving end node of the first link receives the sending end node of the first link When the data frame is transmitted, an ACK frame is sent to the transmitting end node of the first link.
  • the transceiver 2502 is located in the receiving end node of the first link, and is further configured to: when the receiving end node of the first link does not modify the NAV, and when the receiving end node of the first link receives the sending of the first link When the data frame sent by the end node is not sent to the sending end section of the first link The point sends an ACK frame.
  • the node of the first link firstly listens to the physical layer convergence process protocol data unit PPDU sent by the node in the overlapping basic service set OBSS, wherein the node in the OBSS includes: The transmitting end node of the link and the receiving end node of the second link, the first link is a spatial reuse link, the second link is a link that is communicating, and then according to the received power of the PPDU, and/or the PPDU, Update or modify the network allocation vector NAV.
  • the node of the spatial reuse link receives the PPDU sent by the transmitting end node of the link in communication and the receiving end node of the communicating link.
  • the transmitted PPDU may update or modify the NAV according to the received power corresponding to the PPDU sent by the transmitting end node of the link that is communicating or the receiving end of the communicating link, instead of when the spatial reuse link is sent.
  • the NAV can be updated or modified, so that the node update of the spatial reuse link or the probability of modifying the NAV can be reduced, thereby improving the chance of spatial reuse data transmission.
  • the apparatus for updating or modifying the NAV provided by the embodiment of the present invention may implement the foregoing method embodiments.
  • the method and apparatus for updating or modifying the NAV provided by the embodiment of the present invention may be applicable to the sender of the first link and the receiving end of the first link to update or modify the NAV, but is not limited thereto.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明公开了一种更新或者修改NAV的方法及装置，涉及信息领域，可以提高SR数据的传输机会。所述方法包括：第一链路的节点首先监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路，然后根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。本发明适用于SR链路的发送端节点以及SR链路的接收端节点更新或者修改NAV。

Description

更新或者修改NAV的方法及装置
本申请要求于2015年12月22日提交中国专利局、申请号为201510971059.X、发明名称为“更新或者修改NAV的方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及信息技术领域，特别涉及一种更新或者修改NAV的方法及装置。
背景技术
随着信息技术的发展，无线局域网(英文全称：Wireless Local Area Networks，英文缩写：WLAN)也随之发展，现有基于802.11ac的WLAN系统采用OFDM调制方式，在介质访问控制(英文全称：Media Access Control，英文缩写：MAC)层并未考虑基于空间重用(英文全称：Spatial Reuse，英文缩写：SR)的数据传输，因此当用户数量比较密集时，用户之间为了发送数据，竞争的冲突率将大大提高，因此需要考虑SR的数据传输，并且更新网络分配矢量(英文全称：Network Allocation Vector，英文缩写：NAV)，以提高数据传输效率以及提升系统性能。
目前，一种更新或者更新NAV的方法，当节点接收本基本服务集(英文全称：Basic Service Set，英文缩写：BSS)中的节点发送的允许发送(英文全称：Clear to Send，英文缩写：CTS)消息对应的接收功率小于预置阈值，并且接收来自非本BSS中的节点发送的请求发送(英文全称：Request to Send，英文缩写：RTS)消息对应的接收功率小于上述预置阈值，则本BSS中的节点重新更新NAV。
然而，当通过上述方法更新NAV时，当节点接收上述两种消息的接收功率均小于预置阈值时，对发送端以及接收端均更新重新更新NAV，由于在密集场景的无线保真(英文全称：Wireless Fidelity， 英文缩写：WiFi)系统中，上述两种消息的接收功率均小于预置阈值的概率小于能够进行SR数据传输的概率，因此，当通过上述条件满足时，更新NAV，从而导致SR数据传输的机会较低。
发明内容
本发明提供一种更新或者修改NAV的方法及装置，可以提高SR数据的传输机会。
第一方面，本发明实施例提供了一种更新或者修改NAV的方法，所述方法包括：
第一链路的节点监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，所述OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，所述第一链路是空间重用链路，所述第二链路是正在进行通信的链路；
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV。
结合第一方面，在第一方面的第一种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的发送端节点监听到第二链路的发送端节点发送的第一PPDU，则所述第一链路的发送端节点保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，
所述第一链路的发送端节点保持已设置的NAV不更新的步骤，之后还包括：
若所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU，则第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧 /增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，
所述第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV的步骤，具体包括：
若所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带有持续时间Duration字段中的值大于所述第一链路的发送端节点的当前NAV值，则所述第一链路的发送端节点更新所述NAV为所述Duration字段中的值。
结合第一方面，在第一方面的第四种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第一方面的第四种可能的实现方式，在第一方面第五种可能的实现方式中，
所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，具体包括：
若所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的发送端节点的当前NAV值，则所述第一链路的发送端节点更新所述NAV为所述Duration字段中的值。
结合第一方面第五种可能的实现方式，在第一方面的第六种可能的实现方式中，
所述若所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的发送端节点的当前NAV值，则所述第一链路的发送端节点更新所述NAV为所述Duration字段中的值的步骤，之后还包括：
若所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
结合第一方面第五种可能的实现方式，在第一方面第七种可能的实现方式中，
所述第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV的步骤，具体包括：
若所述接收所述第二PPDU对应的接收功率小于所述预置阈值，则所述第一链路的发送端节点修改所述更新后的NAV。
结合第一方面，在第一方面第八种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第一链路的发送端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第一方面第八种可能的实现方式，在第一方面的第九种可能的实现方式中，
所述第一链路的发送端节点根据监听到的所述第二链路的发送 端节点发送的第一PPDU，更新所述NAV为第一时间长度的步骤，之后还包括：
若所第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第一方面的第九种可能的实现方式，在第一方面的第十种可能的实现方式中，
所述第一链路的发送端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV的步骤，具体包括：
若所述接收所述第二PPDU对应的接收功率小于所述预置阈值，则所述第一链路的发送端节点修改所述已更新后的NAV。
结合第一方面，在第一方面的第十一种可能实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的发送端节点未监听到所述第二链路的发送端节点发送的第一PPDU，仅监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的发送端节点根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的节点的当前NAV值之间的大小关系，确定是否更新所述NAV。
结合第一方面的第十一种可能实现方式，在第一方面的第十二种可能实现方式中，
所述第一链路的发送端节点根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的发送端节点的当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，具体包括：
若所述接收到所述第二PPDU对应的接收功率大于所述预置阈 值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的节点的当前NAV值，则所述第一链路的发送端节点更新所述NAV。
结合第一方面，在第一方面的第十三种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的触发帧，则所述第一链路的发送端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第一方面的第十三种可能的实现方式，在第一方面的第十四种可能的实现方式中，
所述第一链路的发送端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV的步骤，具体包括：
若所述接收所述触发帧对应的接收功率大于所述预置阈值，则所述第一链路的发送端节点更新所述NAV；
若所述接收所述触发帧对应的接收功率不大于所述预置阈值，则所述第一链路的发送端节点保持已设置的NAV不更新。
结合第一方面的第十四种可能的实现方式，在第一方面的第十五种可能的实现方式中，
所述第一链路的发送端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV的步骤，之后还包括：
所述第一链路的发送端节点监听到所述第二链路的发送端节点发送的第一PPDU，则所述第一链路的发送端节点保持已更新后的NAV不修改。
结合第一方面，在第一方面的第十六种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的接收端节点仅监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的接收端节点根据接收到所 述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述第二PPDU包括：清除发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧。
结合第一方面的第十六种可能的实现方式，在第一方面的第十七种可能的实现方式中，
所述第一链路的接收端节点根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，具体包括：
若所述接收到所述第二PPDU对应的接收功率大于所述预置阈值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值，则所述第一链路的接收端节点更新所述NAV。
结合第一方面，在第一方面的第十八种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的接收端节点监听到所述第二链路的发送端节点发送的第一PPDU，则所述第一链路的接收端节点保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第一方面的第十八种可能的实现方式，在第一方面的第十九种可能的实现方式中，
所述第一链路的接收端节点保持已设置的NAV不更新的步骤，之后还包括：
若所述第一链路的接收端节点监听到所述第二链路的接收端发送的第二PPDU，则所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二 PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第一方面的第十九种可能的实现方式，在第一方面的第二十种可能的实现方式中，
所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新NAV的步骤，具体包括：
若所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值，则所述第一链路的接收端节点更新所述NAV为所述Duration字段中的值。
结合第一方面，在第一方面的第二十一种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第一方面的第二十一种可能的实现方式，在第一方面第二十二种可能的实现方式中，
所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，具体包括：
若所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的接收端节点的当前NAV值，则所述第一链路的接收端节点更新所述NAV为所述Duration字段中的值。
结合第一方面的第二十一种可能的实现方式，在第一方面第二十三种可能的实现方式中，
所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，之后还包括：
若所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第一方面第二十三种可能的实现方式，在第一方面第二十四种可能的实现方式中，
所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV的步骤，具体包括：
若所述接收所述第二PPDU对应的接收功率小于所述预置阈值，则所述第一链路的接收端节点修改所述已更新后的NAV。
结合第一方面，在第一方面的第二十五种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第一链路的接收端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第一方面第二十五种可能的实现方式，在第一方面第二十六种可能的实现方式中，
所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度的步骤之后，还包括：
若所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第一方面第二十六种可能的实现方式，在第一方面第二十七种可能的实现方式中，
所述第一链路的接收端节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV的步骤，具体包括：
若所述接收所述第二PPDU对应的接收功率小于所述预置阈值，则所述第一链路的接收端节点修改所述已更新后的NAV。
结合第一方面，在第一方面第二十八种可能的实现方式中，
所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
若所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的触发帧，则所述第一链路的接收端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第一方面第二十八种可能的实现方式中，在第一方面第二十九种可能的实现方式中，
所述第一链路的接收端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV的步骤，具体包括：
若所述接收所述触发帧对应的接收功率大于所述预置阈值，则所述第一链路的接收端节点更新所述NAV；
若所述接收所述触发帧对应的接收功率不大于所述预置阈值， 则所述第一链路的接收端节点保持已设置的NAV不更新。
结合第一方面第二十九种可能的实现方式，在第一方面第三十种可能的实现方式中，
所述第一链路的接收端节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV的步骤，之后还包括：
所述第一链路的接收端节点监听到所述第二链路的发送端节点发送的第一PPDU，则所述第一链路的接收端节点保持已更新后的NAV不修改。
结合第一方面第一种可能的实现方式至第一方面第三十种可能的实现方式的任意一种可能的实现方式，在第一方面的第三十一种可能的实现方式中，
所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
结合第一方面第十六种可能的实现方式至第一方面第三十种可能的实现方式，在第一方面的第三十一种可能的实现方式中，
所述方法还包括：
若所述第一链路的接收端节点修改所述NAV，则当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧，所述第一链路的接收端节点向所述第一链路的发送端节点发送ACK帧；
若所述第一链路的接收端节点不修改所述NAV，则当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，所述第一链路的接收端节点不向所述第一链路的发送端节点发送所述ACK帧。
第二方面，本发明实施例提供了一种更新或者修改NAV的装置，所述装置包括：
监听单元，位于第一链路的节点中，用于监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，所述OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点， 所述第一链路是空间重用链路，所述第二链路是正在进行通信的链路；
更新或者修改单元，位于所述第一链路的节点中，用于根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV。
结合第二方面，在第二方面的第一种可能的实现方式中，
所述更新或者修改单元具体包括：第一更新或者修改模块；
所述第一更新或者修改模块，位于所述第一链路的发送端节点中，用于当所述第一链路的发送端节点监听到第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，
所述更新或者修改单元具体包括：第一确定模块：
所述第一确定模块，位于第一链路的发送端节点，用于当所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带有持续时间Duration字段中的值大于所述第一链路的发送端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第二方面，在第二方面的第四种可能的实现方式中，
第一确定模块，位于所述第一链路的发送端节点中，还用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第二方面的第四种可能的实现方式，在第二方面第五种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的发送端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第二方面第五种可能的实现方式，在第二方面的第六种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，还用于当所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
结合第二方面第五种可能的实现方式，在第二方面第七种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述更新后的NAV。
结合第二方面，在第二方面第八种可能的实现方式中，
所述第一更新或者修改模块，位于所述第一链路的发送端节点中，具体用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第 一链路的发送端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第二方面第八种可能的实现方式，在第二方面的第九种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，还用于当所第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第二方面的第九种可能的实现方式，在第二方面的第十种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第二方面，在第二方面的第十一种可能实现方式中，
第一确定模块，位于所述第一链路的发送端节点中，还用于当第一链路的发送端节点未监听到所述第二链路的发送端节点发送的第一PPDU，仅监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的节点的当前NAV值之间的大小关系，确定是否更新所述NAV。
结合第二方面的第十一种可能实现方式，在第二方面的第十二种可能实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收到所述第二PPDU对应的接收功率大于所述预置阈值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的节点的当前NAV值时，更新所述NAV。
结合第二方面，在第二方面的第十三种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点，用于当 所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的触发帧时，根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第二方面的第十三种可能的实现方式，在第二方面的第十四种可能的实现方式中，
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收所述触发帧对应的接收功率大于所述预置阈值时，更新所述NAV；
所述第一确定模块，位于所述第一链路的发送端节点中，具体用于当所述接收所述触发帧对应的接收功率不大于所述预置阈值时，保持已设置的NAV不更新。
结合第二方面的第十四种可能的实现方式，在第二方面的第十五种可能的实现方式中，
第一更新或者修改模块，位于所述第一链路的发送端节点中，用于当所述第一链路的发送端节点监听到所述第二链路的发送端节点发送的第一PPDU时，保持已更新后的NAV不修改。
结合第二方面，在第二方面的第十六种可能的实现方式中，
所述更新或者修改单元具体包括：第二确定模块；
所述第二确定模块，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点仅监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述第二PPDU包括：清除发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧。
结合第二方面的第十六种可能的实现方式，在第二方面的第十七种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收到所述第二PPDU对应的接收功率大于所述预置阈 值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV。
结合第二方面，在第二方面的第十八种可能的实现方式中，
所述第二更新或者修改单元具体包括：第二更新或者修改模块；
所述第二更新或者修改模块，位于所述第一链路的接收端节点中，用于当所述第一链路的接收端节点监听到所述第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第二方面的第十八种可能的实现方式，在第二方面的第十九种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，用于当所述第一链路的接收端节点监听到所述第二链路的接收端发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第二方面的第十九种可能的实现方式，在第二方面的第二十种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第二方面，在第二方面的第二十一种可能的实现方式中，
第二确定模块，位于所述第一链路的接收端节点中，用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与所述第一链路的 接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第二方面的第二十一种可能的实现方式，在第二方面第二十二种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点，具体用于当所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第二方面的第二十一种可能的实现方式，在第二方面第二十三种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第二方面第二十三种可能的实现方式，在第二方面第二十四种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第二方面，在第二方面的第二十五种可能的实现方式中，
第二更新或者修改模块，位于所述第一链路的接收端节点中，用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第一链路的接收端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第二方面第二十五种可能的实现方式，在第二方面第二十六种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第二方面第二十六种可能的实现方式，在第二方面第二十七种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第二方面，在第二方面第二十八种可能的实现方式中，
第二确定模块，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的触发帧时，根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第二方面第二十八种可能的实现方式中，在第二方面第二十九种可能的实现方式中，
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收所述触发帧对应的接收功率大于所述预置阈值时，则更新所述NAV；
所述第二确定模块，位于所述第一链路的接收端节点中，具体用于当所述接收所述触发帧对应的接收功率不大于所述预置阈值时，保持已设置的NAV不更新。
结合第二方面第二十九种可能的实现方式，在第二方面第三十种可能的实现方式中，
所述第二更新或者修改模块，位于所述第一链路的接收端节点中，还用于监听到所述第二链路的发送端节点发送的第一PPDU，则所述第一链路的接收端节点保持已更新后的NAV不修改。
结合第二方面第一种可能的实现方式至第二方面第三十种可能的实现方式的任意一种可能的实现方式，在第二方面的第三十一种 可能的实现方式中，
所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
结合第二方面第十六种可能的实现方式至第二方面第三十种可能的实现方式，在第二方面的第三十一种可能的实现方式中，
所述装置还包括：发送单元；
所述发送单元，位于所述第一链路的接收端节点中，用于当所述第一链路的接收端节点修改所述NAV时，且当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，向所述第一链路的发送端节点发送ACK帧；
所述发送单元，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点不修改所述NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，不向所述第一链路的发送端节点发送所述ACK帧。
第三方面，本发明实施例提供了一种更新或者修改NAV的装置，包括：
处理器，位于第一链路的节点中，用于监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，所述OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，所述第一链路是空间重用链路，所述第二链路是正在进行通信的链路；
所述处理器，位于所述第一链路的节点中，用于根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV。
结合第三方面，在第三方面的第一种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述第一链路的发送端节点监听到第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第三方面的第一种可能的实现方式，在第三方面的第二种 可能的实现方式中，
所述处理器，位于第一链路的发送端节点，具体用于当所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带有持续时间Duration字段中的值大于所述第一链路的发送端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第三方面，在第三方面的第四种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，还用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第三方面的第四种可能的实现方式，在第三方面第五种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述第一链路的发送端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的发送端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第三方面第五种可能的实现方式，在第三方面的第六种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，还用于当所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
结合第三方面第五种可能的实现方式，在第三方面第七种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述更新后的NAV。
结合第三方面，在第三方面第八种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第一链路的发送端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第三方面第八种可能的实现方式，在第三方面的第九种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，还用于当所第一链路的发送端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第三方面的第九种可能的实现方式，在第三方面的第十种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第三方面，在第三方面的第十一种可能实现方式中，
所述处理器，位于所述第一链路的发送端节点中，还用于当第一链路的发送端节点未监听到所述第二链路的发送端节点发送的第一PPDU，仅监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的节点的当前NAV值之间的大小关系，确定是否更新所述NAV。
结合第三方面的第十一种可能实现方式，在第三方面的第十二种可能实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收到所述第二PPDU对应的接收功率大于所述预置阈值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的节点的当前NAV值时，更新所述NAV。
结合第三方面，在第三方面的第十三种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点，用于当所述第一链路的发送端节点监听到所述第二链路的接收端节点发送的触发帧时，根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第三方面的第十三种可能的实现方式，在第三方面的第十四种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收所述触发帧对应的接收功率大于所述预置阈值时，更新所述NAV；
所述处理器，位于所述第一链路的发送端节点中，具体用于当所述接收所述触发帧对应的接收功率不大于所述预置阈值时，保持已设置的NAV不更新。
结合第三方面的第十四种可能的实现方式，在第三方面的第十五种可能的实现方式中，
所述处理器，位于所述第一链路的发送端节点中，还用于当所 述第一链路的发送端节点监听到所述第二链路的发送端节点发送的第一PPDU时，保持已更新后的NAV不修改。
结合第三方面，在第三方面的第十六种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点仅监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收到所述第二PPDU对应的接收功率与预置阈值的大小关系以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述第二PPDU包括：清除发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧。
结合第三方面的第十六种可能的实现方式，在第三方面的第十七种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收到所述第二PPDU对应的接收功率大于所述预置阈值，且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV。
结合第三方面，在第三方面的第十八种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
结合第三方面的第十八种可能的实现方式，在第三方面的第十九种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的 允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第三方面的第十九种可能的实现方式，在第三方面的第二十种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带的持续时间Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第三方面，在第三方面的第二十一种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与所述第一链路的接收端节点的当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
结合第三方面的第二十一种可能的实现方式，在第三方面第二十二种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点，具体用于当所述第一链路的接收端节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的接收端节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
结合第三方面的第二十一种可能的实现方式，在第三方面第二十三种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第三方面第二十三种可能的实现方式，在第三方面第二十 四种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第三方面，在第三方面的第二十五种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，更新所述NAV为第一时间长度，所述第一时间长度为第二PPDU的传输时间与所述短帧间间隔SIFS二者之和，所述SIFS为所述第一链路的接收端节点监听到所述第一PPDU与监听到所述第二PPDU二者之间的时间间隔。
结合第三方面第二十五种可能的实现方式，在第三方面第二十六种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
结合第三方面第二十六种可能的实现方式，在第三方面第二十七种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述已更新后的NAV。
结合第三方面，在第三方面第二十八种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点监听到所述第二链路的接收端节点发送的触发帧时，根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
结合第三方面第二十八种可能的实现方式中，在第三方面第二十九种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收所述触发帧对应的接收功率大于所述预置阈值时，则更新所述NAV；
所述处理器，位于所述第一链路的接收端节点中，具体用于当所述接收所述触发帧对应的接收功率不大于所述预置阈值时，保持已设置的NAV不更新。
结合第三方面第二十九种可能的实现方式，在第三方面第三十种可能的实现方式中，
所述处理器，位于所述第一链路的接收端节点中，还用于监听到所述第二链路的发送端节点发送的第一PPDU，则所述第一链路的接收端节点保持已更新后的NAV不修改。
结合第三方面第一种可能的实现方式至第三方面第三十种可能的实现方式的任意一种可能的实现方式，在第三方面的第三十一种可能的实现方式中，
所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
结合第三方面第十六种可能的实现方式至第三方面第三十种可能的实现方式，在第三方面的第三十一种可能的实现方式中，
所述装置还包括：收发器；
所述收发器，位于所述第一链路的接收端节点中，用于当所述第一链路的接收端节点修改所述NAV时，且当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，向所述第一链路的发送端节点发送ACK帧；
所述收发器，位于所述第一链路的接收端节点中，还用于当所述第一链路的接收端节点不修改所述NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，不向所述第一链路的发送端节点发送所述ACK帧。
本发明提供的更新或者修改NAV的方法及装置，第一链路的节 点首先监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路，然后根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。与目前通过现有技术的方法更新NAV相比，本发明空间重用链路的节点根据是否接收到正在进行通信的链路的发送端节点发送的PPDU以及正在通信的链路的接收端节点发送的PPDU，并且可以根据接收到正在通信的链路的发送端节点或者正在通信的链路的接收端节点发送的PPDU对应的接收功率，更新或者修改NAV，而不是当空间重用链路的发送端节点均小于预置阈值时，才可以更新或者修改NAV，从而可以降低空间重用链路的节点更新或者修改NAV的概率，进而可以提高空间重用数据传输的机会。
附图说明
为了更清楚地说明本发明或现有技术中的技术方案，下面将对本发明或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本发明实施例中更新或者修改NAV的方法流程图；
图2为本发明实施例中另一种更新或者修改NAV的方法流程图；
图3为本发明实施例中又一种更新或者修改NAV的方法流程图；
图4为本发明实施例中又一种更新或者修改NAV的方法流程图；
图5为本发明实施例一种更新或者修改NAV的示意图；
图6为本发明实施例中又一种更新或者修改NAV的方法流程图；
图7为本发明实施例中又一种更新或者修改NAV的方法流程图；
图8为本发明实施例中又一种更新或者修改NAV的方法流程图；
图9为本发明实施例中又一种更新或者修改NAV的方法流程图；
图10为本发明实施例中另一种更新或者修改NAV的示意图；
图11为本发明实施例中又一种更新或者修改NAV的方法流程图；
图12为本发明实施例中又一种更新或者修改NAV的方法流程图；
图13为本发明实施例中又一种更新或者修改NAV的方法流程图；
图14为本发明实施例中又一种更新或者修改NAV的示意图；
图15为本发明实施例中又一种更新或者修改NAV的方法流程图；
图16为本发明实施例中又一种更新或者修改NAV的方法流程图；
图17为本发明实施例中又一种更新或者修改NAV的示意图；
图18为本发明实施例中又一种更新或者修改NAV的方法流程图；
图19为本发明实施例中又一种更新或者修改NAV的方法流程图；
图20为本发明实施例中又一种更新或者修改NAV的方法流程图；
图21为本发明实施例中又一种更新或者修改NAV的示意图；
图22为本发明实施例中又一种更新或者修改NAV的方法流程图；
图23为本发明实施例的一种更新或者修改NAV的装置示意图；
图24为本发明实施例的另一种更新或者修改NAV的装置示意图；
图25为本发明实施例的另一种更新或者修改NAV的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
本发明实施例提供一种更新或者修改NAV的方法，能够提高SR数据传输的机会，如图1所示，所述方法包括：
101、第一链路的节点监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU。
其中，重叠基本服务集(英文全称：overlap Basic Service Set，英文缩写：OBSS)中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路。
其中，第二链路的节点包括：已有ongoing链路的发送端节点以及ongoing链路的接收端节点，ongoing链路为正在进行通信的链路。
对于本发明实施例，ongoing链路已经存在的情况下，其它链路是不能进行信息传输的。在空间重用技术下，第二链路在某些条件下，可以进行并行传输，这种第二链路就是SR链路。
对于本发明实施例，当信道空闲的时候，首先竞争到信道的链路，为ongoing链路。
对于本发明实施例，SR链路的发送端节点以及接收端节点与ongoing链路的发送端节点以及接收端节点，位于存在重叠的两个不同的基本服务集中。
102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。
对于本发明实施例，NAV用在虚拟载波监听中，其作用相当于一个计数器，其中，NAV用于虚拟的反映信道的忙与闲，其中，NAV非0为忙，0为闲。在本发明实施例中，修改NAV为将该NAV重置为0，其中，更新NAV为该NAV设置的时间内不允许并行传输，将NAV重置为0，表征该链路可以并行传输。
对于本发明实施例，SR链路发送端节点根据是否监听到OBSS中的ongoing链路发送端节点和/或ongoing链路接收端的节点发送的PPDU，以及当接收到OBSS中ongoing链路发送端节点和/或ongoing链路接收端的节点发送的PPDU，可以根据接收到ongoing链路发送端节点发送的PPDU的接收功率和/或接收ongoing链路接收端节点发送的PPDU对应的接收功率，确定是否更新或者修改NAV。
对于本发明实施例，修改NAV为将该NAV重置为0或者将NAV修改为更新之前的值。其中，该更新之前的值为第一链路的节点接收到第二链路的节点发送的PPDU之前，第一链路的节点的NAV对应的值。
本发明实施例提供的更新或者修改NAV的方法，空间复用SR链 路的发送端节点首先监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，OBSS中的节点包括：已有ongoing链路的发送端节点以及ongoing链路的接收端节点，然后根据监听到的ongoing链路的发送端节点以及ongoing链路的接收端节点发送的PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。与目前通过现有技术的方法更新NAV相比，本发明实施例SR链路的发送端节点根据是否接收到ongoing链路发送端发送的PPDU以及ongoing链路接收端发送的PPDU，并且可以根据接收到ongoing链路发送端或者ongoing链路接收端发送的PPDU对应的接收功率，更新或者修改NAV，而不是当SR链路发送端均小于预置阈值时，才可以更新或者修改NAV，从而可以SR链路发送端更新或者修改NAV的概率，进而可以提高SR数据传输的机会。
本发明实施例的另一种可能的实现方式，在如图1所示的基础上，步骤102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV，具体包括如图2所示的步骤201。
201、若第一链路的节点监听到第二链路的发送端节点发送的第一PPDU，则第一链路的发送端节点保持已设置的NAV不更新。
其中，第一PPDU包括：请求发送RTS帧以及数据Data帧。
本发明实施例的另一种可能的实现方式，在如图2所示的基础上，步骤201、若第一链路的节点监听到第二链路的发送端节点发送的第一PPDU，则第一链路的发送端节点保持已设置的NAV不更新的步骤，之后还包括如图3所示的步骤301。
301、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，以及第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV。
其中，第二PPDU包括：允许发送CTS帧，接收确认ACK帧或者上行数据帧，Duration字段用于指示传输机会时长(英文全称：transmission opportunity，英文缩写：TxOP)的长度，其中，TXOP 的长度表征该第二链路的传输时间，在此传输时间段内，其它链路不可进行信息传输。
其中，预置阈值为-82dBm，干净信道评估(英文全称：Clear Channel Assessment，英文缩写：CCA)阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
对于本发明实施例，当第一链路的发送端节点首先监听到第二链路的发送端节点发送的第一PPDU时，第一链路的发送端节点保持已更新的NAV，然后当监听到第二链路的接收端节点发送的第二PPDU时，第一链路的发送端节点根据接收第二PPDU对应的接收功率，确定是否更新NAV。
例如，第一PPDU可以为RTS，第二PPDU可以确认字符(英文全称：Acknowledgement，英文缩写：ACK)，当第一链路的发送端节点接收到第二链路发送端发送的RTS时，不更新且不修改NAV，当第一链路的发送端节点接收到第二链路接收端节点发送的CTS时，根据接收CTS对应的接收功率确定是否更新或者修改NAV。
本发明实施例的另一种可能的实现方式，在如图3所示的基础上，步骤301、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，以及第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，具体可以包括如图4所示的步骤401。
401、若第一链路的节点监听到OBSS中的第二链路接收端发送的第二PPDU，则当接收第二PPDU对应的接收功率大于预置阈值，并且第二PPDU携带有持续时间Duration字段中的值大于第一链路的发送端节点的当前NAV值时，第一链路的节点更新NAV为Duration字段中的值。
对于本发明实施例，若第一链路的节点监听到OBSS中第二链路接收端发送的第二PPDU，则当接收第二PPDU对应的接收功率大于 预置阈值，并且第二PPDU携带有持续时间Duration字段中的值不大于第一链路的节点的当前NAV值时，第一链路的节点不更新NAV。
对于本发明实施例，若第一链路的节点监听到第二链路接收端发送的第二PPDU，则当接收第二PPDU对应的接收功率不大于预置阈值，则第一链路的节点不更新NAV。
对于本发明实施例，当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，第一链路的节点不更新NAV，若监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收该第二PPDU的接收功率，确定是否更新NAV，如图5所示。
本发明实施例的另一种可能的实现方式，在如图1所示的基础上，步骤102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV，具体包括如图6所示的步骤601。
601、第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，以及第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV。
其中，Duration字段用于指示传输机会时长TxOP的长度。
本发明实施例的另一种可能的实现方式，在如图6所示的基础上，步骤601、第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，以及第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，具体包括如图7所示的步骤701。
701、若第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，并且Duration字段中的值大于第一链路的节点的当前NAV值，则第一链路的节点更新NAV为Duration字段中的值。
对于本发明实施例，若第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，并且Duration字段中的值不大于第一链路的节点的当前NAV值，则第一链路的节点不更新该NAV值。
本发明实施例的另一种可能的实现方式，在如图7所示的基础上，步骤701、若第一链路的节点根据监听到的第二链路的发送端 节点发送的第一PPDU，并且Duration字段中的值大于第一链路的节点的当前NAV值，则第一链路的节点更新NAV为Duration字段中的值，之后还包括如图8所示的步骤801。
801、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
对于本发明实施例，修改已更新后的NAV为将NAV重置为0或者将NAV修改为更新之前的值。其中，该更新之前的值为第一链路的节点接收到第二链路的发送端节点发送的第一PPDU之前，第一链路的节点的NAV对应的值。
本发明实施例的另一种可能的实现方式，在如图8所示的基础上，步骤801、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV，具体可以包括如图9所示的步骤901。
901、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则当接收第二PPDU对应的接收功率小于预置阈值时，第一链路的节点修改已更新后的NAV。
对于本发明实施例，若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则当第一链路的节点接收到第二PPDU对应的接收功率不小于预置阈值时，第一链路的节点保持已更新后的NAV，不进行修改。其中，第一链路的节点修改已更新后的NAV为将已更新后的NAV重置为0或者将该已更新后的NAV修改为更新之前的值。其中，该更新之前的值为第一链路的节点接收到第二链路的发送端节点发送的第一PPDU之前，第一链路的节点的NAV对应的值。
例如，第一链路的节点在接收到第二链路的发送端节点发送的第一PPDU之前，第一链路的NAV对应的值为2，更新之后NAV的值为5，则当接收第二PPDU对应的接收功率小于预置阈值时，第一链路的节点将该NAV重置为0或者将该NAV修改为接收到第二链路的 发送端节点发送的第一PPDU之前的值，即为2。
例如，第一链路的节点根据第二链路的发送端节点发送的RTS帧，则根据RTS帧中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，然后第一链路的节点根据接收第二链路的接收端节点发送的CTS帧对应的接收功率与预置阈值之间的大小关系，确定是否修改该NAV。
对于本发明实施例，当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，第一链路的节点根据第一PPDU携带的Duration字段中的值与当前NAV值之间的大小关系确定是否更新NAV，若监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收该第二PPDU的接收功率，确定是否修改NAV，如图10所示。
本发明实施例的另一种可能的实现方式，在如图1所示的基础上，步骤102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV，具体包括如图11所示的步骤1101。
1101、第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，更新NAV为第一时间长度。
其中，第一时间长度为第二PPDU的传输时间与短帧间间隔SIFS二者之和，SIFS为第一链路的节点监听到第一PPDU与监听到第二PPDU二者之间的时间间隔。
其中，第一PPDU包括：请求发送RTS帧以及数据Data帧。
本发明实施例的另一种可能的实现方式，在如图11所示的基础上，步骤1101、第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，更新NAV为第一时间长度，之后还包括如图12所示的步骤1201。
1201、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
其中，第二PPDU包括：允许发送CTS帧，接收确认ACK帧或者 上行数据帧。
对于本发明实施例，修改已更新后的NAV为将该NAV重置为0或者将该NAV修改为更新之前的值。其中，该更新之前的值为第一链路的节点接收到第二链路的发送端节点发送的第一PPDU之前，第一链路的节点的NAV对应的值。
本发明实施例的另一种可能的实现方式，在如图12所示的基础上，步骤1201、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV，具体包括如图13所示的步骤1301。
1301、若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则当接收第二PPDU对应的接收功率小于预置阈值时，第一链路的节点修改已更新后的NAV。
对于本发明实施例，若第一链路的节点监听到第二链路的接收端节点发送的第二PPDU，则当接收第二PPDU对应的接收功率不小于预置阈值时，第一链路的节点不修改已更新后的NAV。
对于本发明实施例，当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，第一链路的节点更新NAV为第二PPDU的传输时间与短帧间间隔SIFS二者之和，若监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收该第二PPDU的接收功率，确定是否修改NAV，如图14所示。
本发明实施例的另一种可能的实现方式，在如图1所示的基础上，步骤102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV，具体包括如图15所示的步骤1501。
1501、若第一链路的节点未监听到第二链路的发送端节点发送的第一PPDU，仅监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收到第二PPDU对应的接收功率与预置阈值的大小关系以及第二PPDU携带的持续时间Duration字段中的值与第一链路的节点的当前NAV值之间的大小关系，确定是否更新NAV。
本发明实施例的另一种可能的实现方式，在如图15所示的基础上，步骤1501、若第一链路的节点未监听到第二链路的发送端节点发送的第一PPDU，仅监听到第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收到第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否更新NAV，具体包括如图16所示的步骤1601。
1601、若接收到第二PPDU对应的接收功率大于预置阈值，且第二PPDU携带的持续时间Duration字段中的值大于第一链路的节点的当前NAV值，则第一链路的节点更新NAV。
对于本发明实施例，若接收到第二PPDU对应的接收功率不大于预置阈值，或者第二PPDU携带的持续时间Duration字段中的值不大于第一链路的节点的当前NAV值，则第一链路的节点保持已设置的NAV，不更新NAV。
对于本发明实施例，当第一链路的节点仅接收到第二链路的接收端节点发送的第二PPDU，并未监听到第二链路的发送端节点发送的第一PPDU，则第一链路的节点仅根据接收到第二PPDU的接收功率以及第二PPDU携带的持续时间Duration字段中的值与第一链路的节点的当前NAV值的大小关系，确定是否更新NAV，如图17所示。
本发明实施例的另一种可能的实现方式，在如图1所示的基础上，步骤102、第一链路的节点根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV，具体包括如图18所示的步骤1801。
1801、若第一链路的发送端节点监听到第二链路的接收端节点发送的触发帧，则第一链路的发送端节点根据接收触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
对于本发明实施例，触发帧为第二链路的接收端节点发送的，第一链路的节点能够监听到第二链路的接收端节点发送的触发帧，则第一链路的节点根据接收该触发帧的接收功率与预置阈值大小关系，确定是否更新NAV。
其中，预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本 服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
本发明实施例的另一种可能的实现方式，在如图18所示的基础上，步骤1801、若第一链路的节点监听到第二链路的接收端节点发送的触发帧，则第一链路的节点根据接收触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV，具体包括如图19所示的步骤1901-1902。
1901、若第一链路的节点监听到第二链路的接收端节点发送的触发帧，则当接收触发帧对应的接收功率大于预置阈值时，第一链路的节点更新NAV。
例如，预置阈值为-82dBm，当接收触发帧对应的接收功率为-80dBm，则第一链路的节点更新NAV。
1902、若第一链路的节点监听到第二链路的接收端节点发送的触发帧，则当接收触发帧对应的接收功率不大于预置阈值时，第一链路的节点保持已设置的NAV不更新。
例如，预置阈值为-82dBm，当接收触发帧对应的接收功率为-85dBm，则第一链路的节点保持已设置的NAV不更新。
本发明实施例所示的另一种可能的实现方式，在如图19所示的基础上，步骤1801、若第一链路的节点监听到第二链路的接收端节点发送的触发帧，则第一链路的节点根据接收触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV，之后还包括如图20所示的步骤2001。
2001、若第一链路的节点监听到第二链路的发送端节点发送的第一PPDU，则第一链路的节点保持已更新后的NAV不修改。
对于本发明实施例，当第一链路的节点接收到第二链路的接收端节点发送的触发帧时，第一链路的节点根据接收该触发帧的接收功率确定是否更新NAV，并且之后当第一链路的节点接收到第二链路的发送端节点发送的第一PPDU，保持已更新的NAV不修改，如图21所示。
本发明实施例的另一种可能的实现方式，所述方法还包括如图22所示的步骤2201-2202。
2201、若第一链路的节点为第一链路的接收端节点，并且第一链路的接收端节点修改NAV，则当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，第一链路的接收端节点向第一链路的发送端节点发送ACK帧。
对于本发明实施例，当第一链路的接收端节点将NAV重置为0，并且第一链路的接收端节点接收到第一链路的发送端节点发送数据帧时，第一链路的接收端节点向第一链路的发送端节点发送ACK帧。
2202、若第一链路的节点为第一链路的接收端节点，并且第一链路的接收端节点不修改NAV，则当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，第一链路的接收端节点不向第一链路的发送端节点发送ACK帧。
对于本发明实施例，第一链路的接收端节点不修改NAV包括：第一链路的接收端节点更新NAV以及第一链路的接收端节点保持已设置的NAV。
对于本发明实施例，当第一链路的接收端节点仅是更新NAV，不将该NAV重置为0，并且第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，第一链路的接收端节点不向该第一链路的发送端节点发送ACK帧。
进一步地，作为对图1及图22所示方法的实现，本发明实施例还提供了一种更新或者修改NAV的装置，用于提高SR数据的传输机会，如图23所示，装置包括：监听单元2301、更新或者修改单元2302。
监听单元2301，位于第一链路的节点中，用于监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU。
其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路。
更新或者修改单元2302，位于第一链路的节点中，用于根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。
进一步地，如图24所示，更新或者修改单元2302具体包括：第一更新或者修改模块23021；
第一更新或者修改模块23021，位于第一链路的节点中，用于当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新。
其中，第一PPDU包括：请求发送RTS帧以及数据Data帧。
更新或者修改单元2302具体包括：第一确定模块23022。
第一确定模块23022，位于第一链路的节点，用于当第一链路的发送端节点未监听到第二链路的发送端节点发送的第一PPDU，仅监听到第二链路的接收端节点发送的第二PPDU时，根据接收到第二PPDU对应的接收功率与预置阈值的大小关系以及第二PPDU携带的持续时间Duration字段中的值与第一链路的节点的当前NAV值之间的大小关系，确定是否更新NAV。
其中，第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，Duration字段用于指示传输机会时长TxOP的长度。
其中，预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
第一确定模块23022，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率大于预置阈值，并且第二PPDU携带有持续时间Duration字段中的值大于第一链路的节点的当前NAV值时，更新NAV为Duration字段中的值。
第一确定模块23022，位于第一链路的节点中，还用于根据监听到的第二链路的发送端节点发送的第一PPDU，以及第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，Duration字段用于指示传输机会时长TxOP的长 度。
第一确定模块23022，位于第一链路的节点中，具体用于当第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，并且Duration字段中的值大于第一链路的节点的当前NAV值时，更新NAV为Duration字段中的值。
第一确定模块23022，位于第一链路的节点中，还用于当第一链路的节点监听到第二链路的接收端节点发送的第二PPDU时，根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
第一确定模块23022，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率小于预置阈值时，修改更新后的NAV。
第一更新或者修改模块，位于第一链路的节点中，具体用于根据监听到的第二链路的发送端节点发送的第一PPDU，更新NAV为第一时间长度。
其中，第一时间长度为第二PPDU的传输时间与短帧间间隔SIFS二者之和，SIFS为第一链路的节点监听到第一PPDU与监听到第二PPDU二者之间的时间间隔。
第一确定模块23022，位于第一链路的节点中，还用于当所第一链路的节点监听到第二链路的接收端节点发送的第二PPDU时，根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
第一确定模块23022，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率小于预置阈值时，修改已更新后的NAV。
第一确定模块23022，位于第一链路的节点中，还用于当第一链路的节点未监听到第二链路的发送端节点发送的第一PPDU，仅监听到第二链路的接收端节点发送的第二PPDU时，根据接收到第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否更新NAV。
第一确定模块23022，位于第一链路的节点中，具体用于当接 收到第二PPDU对应的接收功率大于预置阈值时，更新NAV。
第一确定模块23022，位于第一链路的节点，用于当第一链路的节点监听到第二链路的接收端节点发送的触发帧时，根据接收触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
第一确定模块23022，位于第一链路的节点中，具体用于当接收触发帧对应的接收功率大于预置阈值时，更新NAV。
第一确定模块23022，位于第一链路的节点中，具体用于当接收触发帧对应的接收功率不大于预置阈值时，保持已设置的NAV不更新。
第一更新或者修改模块，位于第一链路的节点中，用于当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，保持已更新后的NAV不修改。
该装置还包括：发送单元2401。
发送单元2401，位于第一链路的接收端节点中，用于当第一链路的接收端节点修改NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，向第一链路的发送端节点发送ACK帧。
发送单元2401，位于第一链路的接收端节点中，还用于当第一链路的接收端节点不修改NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，不向第一链路的发送端节点发送ACK帧。
本发明实施例提供的更新或者修改NAV的装置，第一链路的节点首先监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路，然后根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。与目前通过现有技术的方法更新NAV相比，本发明实施例空间重用链路的节点根据是否接收到正在进行通信的链路的发送端节点发送的PPDU以及正在通信的链路的 接收端节点发送的PPDU，并且可以根据接收到正在通信的链路的发送端节点或者正在通信的链路的接收端节点发送的PPDU对应的接收功率，更新或者修改NAV，而不是当空间重用链路的发送端节点均小于预置阈值时，才可以更新或者修改NAV，从而可以降低空间重用链路的节点更新或者修改NAV的概率，进而可以提高空间重用数据传输的机会。
需要说明的是，本发明实施例中提供的扩充存储阵列的中各设备所对应的其他相应描述，可以参考图1-图22中的对应描述，在此不再赘述。
再进一步地，本发明实施例还提供了一种更新或者修改NAV的装置，如图25所示，该装置包括：处理器2501、收发器2502及存储器2503，处理器2501通过数据总线与存储器2503和收发器2502连接。
处理器2501，位于第一链路的节点中，用于监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU。
其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路。
处理器2501，位于第一链路的节点中，用于根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。
处理器2501，位于第一链路的节点中，具体用于当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新。
其中，第一PPDU包括：请求发送RTS帧以及数据Data帧。
处理器2501，位于第一链路的节点，具体用于当第一链路的节点监听到第二链路的接收端节点发送的第二PPDU时，根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，以及第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV。
其中，第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，Duration字段用于指示传输机会时长TxOP的长度。
其中，所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
处理器2501，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率大于预置阈值，并且第二PPDU携带有持续时间Duration字段中的值大于第一链路的节点的当前NAV值时，更新NAV为Duration字段中的值。
处理器2501，位于第一链路的节点中，还用于根据监听到的第二链路的发送端节点发送的第一PPDU，以及第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，Duration字段用于指示传输机会时长TxOP的长度。
处理器2501，位于第一链路的节点中，具体用于当第一链路的节点根据监听到的第二链路的发送端节点发送的第一PPDU，并且Duration字段中的值大于第一链路的节点的当前NAV值时，更新NAV为Duration字段中的值。
处理器2501，位于第一链路的节点中，还用于当第一链路的节点监听到第二链路的接收端节点发送的第二PPDU时，根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
处理器2501，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率小于预置阈值时，修改更新后的NAV。
处理器2501，位于第一链路的节点中，具体用于根据监听到的第二链路的发送端节点发送的第一PPDU，更新NAV为第一时间长度。
其中，第一时间长度为第二PPDU的传输时间与短帧间间隔SIFS二者之和，SIFS为第一链路的节点监听到第一PPDU与监听到第二PPDU二者之间的时间间隔。
处理器2501，位于第一链路的节点中，还用于当所第一链路的节点监听到第二链路的接收端节点发送的第二PPDU时，根据接收第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改已更新后的NAV。
处理器2501，位于第一链路的节点中，具体用于当接收第二PPDU对应的接收功率小于预置阈值时，修改已更新后的NAV。
处理器2501，位于第一链路的节点中，还用于当第一链路的节点未监听到第二链路的发送端节点发送的第一PPDU，仅监听到第二链路的接收端节点发送的第二PPDU时，根据接收到第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否更新NAV。
处理器2501，位于第一链路的节点中，具体用于当接收到第二PPDU对应的接收功率大于预置阈值时，更新NAV。
处理器2501，位于第一链路的节点，用于当第一链路的节点监听到第二链路的接收端节点发送的触发帧时，根据接收触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV。
处理器2501，位于第一链路的节点中，具体用于当接收触发帧对应的接收功率大于预置阈值时，更新NAV。
处理器2501，位于第一链路的节点中，具体用于当接收触发帧对应的接收功率不大于预置阈值时，保持已设置的NAV不更新。
处理器2501，位于第一链路的节点中，还用于当第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，保持已更新后的NAV不修改。
收发器2502，位于第一链路的接收端节点中，用于当第一链路的接收端节点修改NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，向第一链路的发送端节点发送ACK帧。
收发器2502，位于第一链路的接收端节点中，还用于当第一链路的接收端节点不修改NAV时，且当第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，不向第一链路的发送端节 点发送ACK帧。
本发明实施例提供的更新或者修改NAV的装置，第一链路的节点首先监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，其中，OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，第一链路是空间重用链路，第二链路是正在进行通信的链路，然后根据PPDU，和/或PPDU的接收功率，更新或者修改网络分配矢量NAV。与目前通过现有技术的方法更新NAV相比，本发明实施例空间重用链路的节点根据是否接收到正在进行通信的链路的发送端节点发送的PPDU以及正在通信的链路的接收端节点发送的PPDU，并且可以根据接收到正在通信的链路的发送端节点或者正在通信的链路的接收端节点发送的PPDU对应的接收功率，更新或者修改NAV，而不是当空间重用链路的发送端节点均小于预置阈值时，才可以更新或者修改NAV，从而可以降低空间重用链路的节点更新或者修改NAV的概率，进而可以提高空间重用数据传输的机会。
需要说明的是，本发明实施例中提供的更新或者修改NAV中各设备所对应的其他相应描述，可以参考图1至图22任意一项中的对应描述，在此不再赘述。
本发明实施例提供的更新或者修改NAV的装置可以实现上述提供的方法实施例，具体功能实现请参见方法实施例中的说明，在此不再赘述。本发明实施例提供的更新或者修改NAV的方法及装置可以适用于第一链路的发送端以及第一链路的接收端更新或者修改NAV，但不仅限于此。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (22)

  1. 一种更新或者修改NAV的方法，其特征在于，包括：
    第一链路的节点监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，所述OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，所述第一链路是空间重用链路，所述第二链路是正在进行通信的链路；
    所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV。
  2. 根据权利要求1所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
    若所述第一链路的节点监听到第二链路的发送端节点发送的第一PPDU，则所述第一链路的节点保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
  3. 根据权利要求2所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点保持已设置的NAV不更新的步骤，之后还包括：
    若所述第一链路的节点监听到所述第二链路的接收端节点发送的第二PPDU，则第一链路的节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
  4. 根据权利要求3所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV的步骤，具体包括：
    若所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带有持续时间Duration字段中的值大于所述第一链路的节点的当前NAV值，则所述第一链路的节点更新所述NAV为所述Duration字段中的值。
  5. 根据权利要求1所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
    所述第一链路的节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
  6. 根据权利要求5所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV的步骤，具体包括：
    若所述第一链路的节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的节点的当前NAV值，则所述第一链路的节点更新所述NAV为所述Duration字段中的值。
  7. 根据权利要求6所述的更新或者修改NAV的方法，其特征在于，所述若所述第一链路的节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的节点的当前NAV值，则所述第一链路的节点更新所述NAV为所述Duration字段中的值的步骤，之后还包括：
    若所述第一链路的节点监听到所述第二链路的接收端节点发送的第二PPDU，则所述第一链路的节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
  8. 根据权利要求7所述的更新或者修改NAV的方法，其特征在 于，所述第一链路的节点根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV的步骤，具体包括：
    若所述第二PPDU对应的接收功率小于所述预置阈值，则所述第一链路的节点修改所述更新后的NAV。
  9. 根据权利要求1所述的更新或者修改NAV的方法，其特征在于，所述第一链路的节点根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV的步骤，具体包括：
    若所述第一链路的节点监听到所述第二链路的接收端节点发送的触发帧，则所述第一链路的节点根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV；
    若所述接收所述触发帧对应的接收功率大于所述预置阈值，则所述第一链路的节点更新所述NAV；
    若所述接收所述触发帧对应的接收功率不大于所述预置阈值，则所述第一链路的节点保持已设置的NAV不更新。
  10. 根据权利要求2-9任一项所述的更新或者修改NAV的方法，其特征在于，所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
  11. 根据权利要求1所述的更新或者修改NAV的方法，其特征在于，所述方法还包括：
    若所述第一链路的节点为第一链路的接收端节点，并且所述第一链路的接收端节点修改所述NAV，则当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧，所述第一链路的接收端节点向所述第一链路的发送端节点发送ACK帧；
    若所述第一链路的节点为第一链路的接收端节点，并且所述第一链路的接收端节点不修改所述NAV，则当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，所述第一链路的接收端节点不向所述第一链路的发送端节点发送所述ACK帧。
  12. 一种更新或者修改NAV的装置，其特征在于，包括：
    监听单元，位于第一链路的节点中，用于监听重叠基本服务集OBSS中的节点发送的物理层汇聚过程协议数据单元PPDU，所述OBSS中的节点包括：第二链路的发送端节点及第二链路的接收端节点，所述第一链路是空间重用链路，所述第二链路是正在进行通信的链路；
    更新或者修改单元，位于所述第一链路的节点中，用于根据所述PPDU，和/或所述PPDU的接收功率，更新或者修改网络分配矢量NAV。
  13. 根据权利要求12所述的更新或者修改NAV的装置，其特征在于，所述更新或者修改单元具体包括：第一更新或者修改模块；
    所述第一更新或者修改模块，位于所述第一链路的节点中，用于当所述第一链路的节点监听到第二链路的发送端节点发送的第一PPDU时，保持已设置的NAV不更新，所述第一PPDU包括：请求发送RTS帧以及数据Data帧。
  14. 根据权利要求13所述的更新或者修改NAV的装置，其特征在于，所述更新或者修改单元具体包括：第一确定模块：
    所述第一确定模块，位于第一链路的节点，用于当所述第一链路的节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，以及所述第二PPDU携带有持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新NAV，所述第二PPDU包括：允许发送CTS帧/增强的允许发送ECTS帧、接收确认ACK帧或者上行数据帧，所述Duration字段用于指示传输机会时长TxOP的长度。
  15. 根据权利要求14所述的更新或者修改NAV的装置，其特征在于
    所述第一确定模块，位于所述第一链路的节点中，具体用于当所述接收第二PPDU对应的接收功率大于所述预置阈值，并且所述第二PPDU携带有持续时间Duration字段中的值大于所述第一链路的节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
  16. 根据权利要求12所述的更新或者修改NAV的装置，其特征 在于，
    第一确定模块，位于所述第一链路的节点中，还用于根据监听到的所述第二链路的发送端节点发送的第一PPDU，以及所述第一PPDU中携带的持续时间Duration字段中的值与当前NAV值之间的大小关系，确定是否更新所述NAV，所述Duration字段用于指示传输机会时长TxOP的长度。
  17. 根据权利要求16所述的更新或者修改NAV的装置，其特征在于，
    所述第一确定模块，位于所述第一链路的节点中，具体用于当所述第一链路的节点根据监听到的所述第二链路的发送端节点发送的第一PPDU，并且所述Duration字段中的值大于所述第一链路的节点的当前NAV值时，更新所述NAV为所述Duration字段中的值。
  18. 根据权利要求17所述的更新或者修改NAV的装置，其特征在于，
    所述第一确定模块，位于所述第一链路的节点中，还用于当所述第一链路的节点监听到所述第二链路的接收端节点发送的第二PPDU时，根据接收所述第二PPDU对应的接收功率与预置阈值之间的大小关系，确定是否修改更新后的NAV。
  19. 根据权利要求18所述的更新或者修改NAV的装置，其特征在于，
    所述第一确定模块，位于所述第一链路的节点中，具体用于当所述第二PPDU对应的接收功率小于所述预置阈值时，修改所述更新后的NAV。
  20. 根据权利要求12所述的更新或者修改NAV的装置，其特征在于，
    所述第一确定模块，位于所述第一链路的节点，用于当所述第一链路的节点监听到所述第二链路的接收端节点发送的触发帧时，根据接收所述触发帧对应的接收功率与预置阈值的大小关系，确定是否更新NAV；
    所述第一确定模块，位于所述第一链路的节点中，具体用于当所述接收所述触发帧对应的接收功率大于所述预置阈值时，更新所述NAV；
    所述第一确定模块，位于所述第一链路的节点中，具体用于当所述接收所述触发帧对应的接收功率不大于所述预置阈值时，保持已设置的NAV不更新。
  21. 根据权利要求13-20任一项所述的更新或者修改NAV的装置，其特征在于，所述预置阈值为-82dBm，干净信道评估CCA阈值、重叠基本服务集包检测门限OBSS packet detection level以及信号灵敏度中的任意一个。
  22. 根据权利要求12所述的更新或者修改NAV的装置，其特征在于，所述装置还包括：发送单元；
    所述发送单元，位于所述第一链路的接收端节点中，用于当所述第一链路的节点为第一链路的接收端节点，并且所述第一链路的接收端节点修改所述NAV时，且当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，向所述第一链路的发送端节点发送ACK帧；
    所述发送单元，位于所述第一链路的接收端节点中，还用于当所述第一链路的节点为第一链路的接收端节点，并且所述第一链路的接收端节点不修改所述NAV时，且当所述第一链路的接收端节点接收到第一链路的发送端节点发送的数据帧时，不向所述第一链路的发送端节点发送所述ACK帧。
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