WO2017152599A1 - 网络分配矢量的处理方法及装置 - Google Patents

网络分配矢量的处理方法及装置 Download PDF

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Publication number
WO2017152599A1
WO2017152599A1 PCT/CN2016/097785 CN2016097785W WO2017152599A1 WO 2017152599 A1 WO2017152599 A1 WO 2017152599A1 CN 2016097785 W CN2016097785 W CN 2016097785W WO 2017152599 A1 WO2017152599 A1 WO 2017152599A1
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Prior art keywords
radio frame
nav
duration
station
site
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PCT/CN2016/097785
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English (en)
French (fr)
Inventor
韩志强
邢卫民
吕开颖
李楠
Original Assignee
中兴通讯股份有限公司
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to ES16893244T priority Critical patent/ES2886626T3/es
Priority to EP21193765.1A priority patent/EP3982690A1/en
Priority to US16/083,375 priority patent/US11240822B2/en
Priority to EP16893244.0A priority patent/EP3429300B1/en
Publication of WO2017152599A1 publication Critical patent/WO2017152599A1/zh
Priority to US17/587,173 priority patent/US11956812B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment 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 application relates to, but is not limited to, the field of communications, and in particular, to a method and an apparatus for processing a Network Allocation Vector (NAV).
  • NAV Network Allocation Vector
  • Wireless Local Area Network is rapidly developing.
  • 802.11ac technology introduces a larger channel bandwidth and a higher-order multiple input multiple output (Multiple Input Multiple Output).
  • MIMO multiple Input Multiple Output
  • the data rate can reach more than 1 Gbps.
  • the Institute for Electrical and Electronic Engineers (IEEE) standards organization established the TGax task force to address WLAN network efficiency issues.
  • TGax is also called High Efficiency (referred to as HE). Task group.
  • an access point (AP) and a plurality of stations (Stations, referred to as STAs) associated with an AP form a basic service set (BSS).
  • BSS basic service set
  • 802.11 defines two modes of operation: distributed coordination function (DCF) and point coordination function (PCF), and improvements for these two modes of operation: enhanced distributed channel
  • the DCF is the most basic operation mode, and the multiple carriers share the wireless channel by using the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism.
  • DCF distributed coordination function
  • PCF point coordination function
  • EDCA enhanced distributed channel access
  • HCCA hybrid coordination function controlled channel access
  • the DCF is the most basic operation mode, and the multiple carriers share the wireless channel by using the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism.
  • CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
  • EDCA is an enhanced mode of operation that maps upper-level data to four different access categories (AC): AC_VO (voice, voice), AC_VI (video, video), AC_BE (best effort, best effort) ), AC_BK (background, background), each queue access category uses a different competition The parameters of the channel are used to prioritize.
  • EDCA uses the CSMA/CA mechanism to allow multiple different priority queues to share wireless channels and to reserve a Transmission Opportunity (TXOP).
  • TXOP Transmission Opportunity
  • 802.11 proposes a virtual channel detection mechanism, that is, by including a reserved channel time information (Duration field) in a Media Access Control (MAC) frame header of a radio frame. Ways to avoid collisions with hidden sites.
  • the MAC frame header contains reserved channel time information to protect for a period of time after the end of the radio frame.
  • the other listening site that receives the radio frame containing the reserved channel time information sets a network Allocation Vector (NAV) stored locally, and the value of the NAV is set to take the reserved channel time information and the reserved time information.
  • NAV network Allocation Vector
  • the sender sends a Request To Send (RTS) for channel reservation
  • the RTS includes a channel reservation time information
  • the receiver ie, the destination station for receiving the radio frame
  • CTS acknowledgement transmission frame
  • the CTS also includes a channel reservation time information to ensure that the sender can complete subsequent data frame exchange.
  • the schematic diagram of setting the NAV is as shown in FIG. 2.
  • the general data frame exchange process includes the sender sending a data frame, and the target receiver successfully receives the reply response frame.
  • the channel time NAV of the RTS/CTS reservation in FIG. 2 may include multiple frame exchanges. The time of the process. In Fig. 2, SIFS indicates a Short Interframe Space.
  • channel reservation time information may also be included in the data frame and the response frame.
  • the data frame may be directly transmitted without using the channel time of the RTS/CTS reservation, and the channel reservation time is carried in the data frame and the response frame, and the reservation time information of the data frame includes at least the transmission of the response frame of the current frame exchange.
  • the time can also include the time of the next frame exchange.
  • a radio frame In a WLAN system, a radio frame generally includes a physical layer header portion preamble (Preamble) and a physical layer payload portion PHY Service Data Unit (PSDU).
  • the preamble includes training sequences and signaling indications required to decode the PSDU, such as rate, coding mode, and the like.
  • IEEE802.11ax four types of preambles are defined according to different application scenarios: High Efficiency Single-User format (HE SU format) and High Efficiency Multiple-User (High Efficiency Multiple-User). Format, referred to as HE MU format), High Efficiency Trigger based UL (Uplink) format, and High Efficiency Extended Range SU format.
  • the domain for carrying high efficiency (HE) user information is the high efficiency signal domain A HE-SIG-A and the high efficiency signal domain B HE-SIG-B (HE SIG is High Efficiency SIGNAL field) abbreviation of).
  • HE-SIG-A exists in all of the above four types of preambles.
  • HE-SIG-B is used to indicate the information of each user in the case of multiple users, and is carried in a multi-user format.
  • the positions of each of the above four preamble types are determined, and the indicated lengths of other domains are determinable.
  • the multi-user format the number of symbols of HE-SIG-B is indicated in HE-SIG-A.
  • the difference between the extended range single-user format and the single-user format is that HE-SIG-A is repeated. That is, the extended range single user format contains two HE-SIG-A.
  • the physical layer frame header adds the identifier information of the receiver.
  • the STA may abandon receiving the radio frame.
  • Physical layer load section The main purpose of this is to prevent the STA from decoding data packets that are not related to itself, thereby saving site power.
  • the receiver identifier information includes a basic service set identifier and a transmission Opportunity Duration (TXOP Duration) indication (corresponding to the reserved channel time information included in the MAC, and has different layers in different layers). Name), spatial multiplexing information.
  • TXOP Duration transmission Opportunity Duration
  • the identifier information of the receiver further includes identification information of each receiver and the like.
  • the third-party station judges the early termination of the reception through the identification information of the receiver in the physical layer preamble.
  • the third-party station when the receiving radio frame is terminated early, the third-party station only updates the NAV by using the TXOP Duration, thereby causing the protection time to advance, the NAV update is inaccurate, and the collision with the hidden site occurs.
  • the embodiment of the invention provides a method and a device for processing a network allocation vector (NAV), so as to at least solve the problem that the NAV update existing in the related art is inaccurate, resulting in collision with a hidden site.
  • NAV network allocation vector
  • a method for processing a NAV including: terminating receiving the first radio frame if it is determined that a destination receiving station of a first radio frame being received is not the first station; Updating the NAV of the first station or maintaining the NAV of the first station according to a remaining duration of the first radio frame and a first transmission opportunity duration carried in the first radio frame, where The remaining duration of the first radio frame is a transmission time for transmitting the remaining portion of the first radio frame after terminating the reception of the first radio frame.
  • updating the NAV of the first station or maintaining the first station according to a remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame The NAV is unchanged, including: determining the remaining duration of the first radio frame according to a preamble type of the first radio frame and a transmission time of the first radio frame; according to the determined first radio frame The remaining duration and the first transmission opportunity duration, updating the NAV of the first station or maintaining the NAV of the first station unchanged.
  • determining the remaining duration of the first radio frame according to a preamble type of the first radio frame and a transmission time of the first radio frame includes: determining, according to a preamble type of the first radio frame Ending the receiving position of the first radio frame at the end of the receiving time; determining the remaining duration of the first radio frame according to the transmission time of the first radio frame and the determined termination receiving position.
  • determining, according to the preamble type of the first radio frame, that the termination receiving location of the first radio frame at the time of terminating reception includes at least one of: a preamble type of the first radio frame is a single user In the case of a format or a scheduling-based uplink format, determining a time point at which the high-efficiency signal field A HE-SIG-A in the first radio frame ends is the termination receiving position; In the case where the preamble type of the radio frame is an extended range single user format, determining a time point at which the repeated high efficiency signal field A HE-SIG-A in the first radio frame ends is the termination receiving position; In a case where the preamble type of the first radio frame is a multi-user format, when it is determined by the high-efficiency signal field A HE-SIG-A in the first radio frame that the destination receiving station is not the first station, it is determined a time point at which the HE-SIG-A in the first radio frame ends is the termination receiving location; in a case
  • the method further includes: The first functional entity of the first site sends a reception end indication to the second functional entity of the first site, where the reception end indication is used to instruct the second functional entity to update the NAV of the first site or Maintain the NAV of the first site unchanged.
  • updating the NAV of the first station or maintaining the NAV according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame The NAV of the first station is unchanged, and the second function entity updates the NAV of the first station according to a predetermined value carried in the receiving end indication or maintains the NAV of the first station unchanged, where And the predetermined value is a sum of the remaining duration of the first radio frame and the duration of the first transmission opportunity; or the second functional entity is configured according to the first carried in the receiving end indication
  • the remaining duration of a radio frame and the first transmission opportunity duration update the NAV of the first station or maintain the NAV of the first station unchanged.
  • the second functional entity updates the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the receiving end indication Or maintaining the NAV of the first station unchanged: the second function entity calculates the remaining duration of the first radio frame and the duration of the first transmission opportunity carried in the receiving end indication And the second functional entity is configured to update and update the NAV of the first site or maintain the NAV of the first site unchanged.
  • the first functional entity is configured to perform at least one of: detecting a signal strength, transmitting and receiving a wireless frame on a wireless channel, and providing a service to the second functional entity; and/or,
  • the second functional entity is configured to perform at least one of: controlling access of the first functional entity to the wireless channel, receiving and decoding the data unit sent by the first functional entity, and transmitting the data unit to the first function
  • the entity requests the service for virtual carrier detection control.
  • updating the NAV of the first station or maintaining the NAV according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame The NAV of the first station is unchanged, including: determining whether a sum of the remaining duration of the first radio frame and the duration of the first transmission opportunity is greater than the NAV; if the determination result is yes, using Updating the NAV of the first station by the sum of the remaining duration of the first radio frame and the duration of the first transmission opportunity; if the determination result is no, maintaining the first station NAV is unchanged.
  • updating the NAV of the first station or maintaining the NAV according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame The NAV of the first station is unchanged, comprising: saving the first transmission opportunity duration using a predetermined variable, and updating the radio frame duration timer using the remaining duration of the first radio frame; when the radio frame When the duration timer is zero, determining whether the predetermined variable is greater than the value of the NAV; if the determination result is greater than, updating the NAV using the predetermined variable; if the determination result is less than or equal to Maintaining the NAV of the first station unchanged; or receiving a second radio frame before the radio frame duration timer is zero; determining that the destination receiving station of the second radio frame is not the first At the time of the station, the second radio frame is terminated, and it is determined whether the sum of the remaining duration of the second radio frame and the duration of the second transmission opportunity carried in the second radio frame is large.
  • the predetermined transmission variable is updated using the second transmission opportunity duration, and the second radio frame is used
  • the remaining duration duration updates the radio frame duration timer; if the result of the determination is less than or equal to, the NAV of the first station is maintained unchanged.
  • updating the NAV of the first station or maintaining the NAV according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame The NAV of the first station is unchanged, including: determining the remaining of the first radio frame according to a current transmission duration of the first radio frame indicated by the non-high throughput signal domain of the first radio frame Remaining duration; updating the NAV of the first station or maintaining the NAV of the first station unchanged according to the determined remaining duration of the first radio frame and the first transmission opportunity duration.
  • a processing apparatus for a NAV comprising: a termination module configured to terminate a receiving station if it is determined that a destination receiving station of a first radio frame being received is not the first station a first radio frame; the processing module, configured to update the NAV of the first station or maintain the location according to a remaining duration of the first radio frame and a first transmission opportunity duration carried in the first radio frame
  • the NAV of the first station is unchanged, wherein the remaining duration of the first radio frame is a transmission time for transmitting the remaining portion of the first radio frame after terminating the reception of the first radio frame.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed.
  • the remaining duration of the radio frame sent by the sending station is also considered, thereby ensuring the accuracy of the NAV update.
  • the problem that the NAV update in the related technology is inaccurate and the collision with the hidden site is solved, thereby ensuring the accuracy of the NAV update, ensuring the fairness of the transmission and the competition channel, and reducing the collision between the hidden sites.
  • FIG. 1 is a schematic diagram of a basic service set in the related art
  • FIG. 2 is a schematic diagram of virtual carrier protection in the related art
  • FIG. 3 is a schematic diagram of an advance update of NAV in the related art
  • FIG. 4 is a flowchart of a method of processing a NAV according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a correct update of a NAV according to an embodiment of the present invention.
  • FIG. 6 is a topological structural diagram of a BSS according to Embodiment 6 of the present invention.
  • FIG. 7 is a schematic diagram of transmitting only a preamble on a channel in which a secondary channel is busy according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of updating a NAV using a timer method according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of updating a NAV using a timer method in a complicated case according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing the structure of a processing apparatus for a NAV according to an embodiment of the present invention.
  • the third-party station only uses the TXOP Duration to update the NAV, which causes a short protection time and interferes with the current transmission. For example, as shown in FIG. 3, station A sends a radio frame to station B, and station C is a bypass station. Since station B and station C are hidden sites, site C determines that the radio frame sent by station A is not detected by detecting the physical frame header. Contains its own data, and Site C chooses to discard the radio frame and update the NAV.
  • the protection time will be advanced (as shown by the dashed line in Figure 3), resulting in the time that should be protected ( Figure 3).
  • the solid line shows) there is no protection. In this way, the station C will contend for the channel to transmit, and interfere with the acknowledgement (Acknowledgment, ACK for short) message sent by the station B, causing a collision.
  • FIG. 4 is a flowchart of a method for processing a NAV according to an embodiment of the present invention. The method comprises the following steps:
  • Step S402 in the case that it is determined that the destination receiving station of the first radio frame being received is not the first station (corresponding to the third-party station described above), the receiving of the first radio frame is terminated;
  • Step S404 updating the NAV of the first station or maintaining the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame, where the first wireless
  • the remaining duration of the frame is the transmission time for transmitting the remainder of the first radio frame after terminating the reception of the first radio frame.
  • the foregoing first transmission opportunity duration is a time required for transmitting data between the transmitting station of the first radio frame and the destination receiving station of the first radio frame, where the first radio frame is a radio frame being received, that is, current Wireless frame.
  • the remaining duration of the first radio frame is also taken into consideration, and the advancement of the time required for protection is avoided, and the guarantee is ensured.
  • the accuracy of the NAV update The problem that the NAV update in the related technology is inaccurate and the collision with the hidden site is solved, thereby ensuring the accuracy of the NAV update, ensuring the fairness of the transmission and the competition channel, and reducing the collision between the hidden sites.
  • step S404 updating the NAV of the first station or maintaining the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame.
  • the NAV of a station may be unchanged: determining, according to a preamble type of the first radio frame and a transmission time of the first radio frame, a remaining duration of the first radio frame; according to the determined remaining duration of the first radio frame and The first transmission opportunity duration carried in the first radio frame, updating the NAV of the first station or maintaining the NAV of the first station unchanged.
  • the foregoing first transmission opportunity duration may be determined according to a transmission opportunity duration field of the HE-SIG-A domain in the first radio frame.
  • determining the remaining duration of the first radio frame according to the preamble type of the first radio frame and the transmission time of the first radio frame comprises: determining, according to a preamble type of the first radio frame. a termination receiving position of a radio frame at a termination reception time; determining the remaining duration of the first radio frame according to the transmission time of the first radio frame and the determined termination reception location.
  • the termination receiving locations corresponding to the radio frames of different preamble types may be different. Therefore, determining the first radio frame according to the preamble type of the first radio frame and the transmission time of the first radio frame.
  • determining, according to the preamble type of the first radio frame, that the first radio frame terminates receiving at the time of receiving the reception includes at least one of the following:
  • determining a time point at which the HE-SIG-A in the first radio frame ends is a termination receiving location
  • determining a time point at which the repeated HE-SIG-A in the first radio frame ends is a termination receiving position
  • the preamble type of the first radio frame is a multi-user format
  • determining the HE-SIG in the first radio frame The time point at which -A ends is the termination of the receiving position
  • the HE-SIG in the first radio frame is determined.
  • the point in time at which B ends is the termination of the receiving position.
  • the termination reception position of the first radio frame can be determined according to the preamble type of the first radio frame.
  • the main body performing the above steps may be the first site, and the step S402 may be the first functional entity in the first site, and the performing step S404 may be the first site in the first site.
  • Two functional entities The following describes an embodiment of the present invention by using the first site as an example: before or after the step S402, the following operations may be performed: the second function of the first functional entity of the first site to the first site
  • the entity sends a reception end indication; wherein the reception end indication is used to instruct the second function entity to update the NAV of the first station Or maintain the NAV of the first site unchanged.
  • two functional entities that is, a first functional entity and a second functional entity, which may perform different actions, may be configured in the first site, where the first functional entity may perform the first wireless Determining the destination site of the frame, and sending a corresponding indication to the second function entity according to the determination result, the second function entity may perform a corresponding action according to the instruction from the first function entity, for example, the second function entity may be based on the first function
  • the receiving end of the entity indicates whether it is necessary to update the NAV of the first station, and performs corresponding processing according to the judgment result.
  • the first functional entity after the first functional entity receives the first radio frame and determines that the destination receiving station of the first radio frame is not the first station, performing the action and the direction of terminating receiving the first radio frame
  • the action of the second function entity to send the reception end indication may be in no particular order.
  • the first functional entity and the second functional entity may be located in different layers in the first site.
  • the first functional entity may be located in a physical layer of the first site, and can perform functions that the physical layer can implement.
  • the two functional entities may be located in the MAC layer of the first site and are capable of performing functions that the MAC layer can implement.
  • the first station can perform the steps shown in FIG. 4, and the following describes how the first station performs the above step S404:
  • updating the NAV of the first station or maintaining the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame And changing: the foregoing second functional entity updates the NAV of the first station according to a predetermined value carried in the reception end indication or maintains the NAV of the first station, wherein the predetermined value is a remaining duration of the first radio frame. And the sum of the first transmission opportunity durations; or the second functional entity updating the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the reception end indication or maintaining the first The NAV of the site does not change.
  • the reception end indication is sent by the first functional entity to the second functional entity, and therefore, the sum of the remaining duration of the first radio frame and the first transmission opportunity duration may be After being determined to be carried in the first radio frame, the first functional entity may directly carry the remaining duration of the first radio frame and the first transmission opportunity duration in the reception end indication.
  • the second functional entity updates the NAV of the first station according to the remaining duration of the first radio frame carried in the reception end indication and the duration of the first transmission opportunity or Maintaining the NAV of the first station does not include: the second function entity calculates a sum of the remaining duration of the first radio frame carried in the reception end indication and the duration of the first transmission opportunity, and the second functional entity obtains and updates according to the calculation The NAV of a site or the NAV of the first site is unchanged.
  • the second functional entity may determine the sum of the two by itself, and according to the determined first The sum of the remaining duration of the radio frame and the duration of the first transmission opportunity determines whether the NAV of the first station needs to be updated.
  • the first functional entity may be configured to perform at least one of: detecting a signal strength, transmitting and receiving a wireless frame on a wireless channel, and providing a service to a second functional entity (including but not limited to the foregoing Sending a reception end indication to the second functional entity, and the like; in another optional embodiment, the foregoing second functional entity may be configured to perform at least one of: controlling the access of the first functional entity to the wireless channel, Receiving and decoding the data unit sent by the first functional entity, transmitting the data unit to the first functional entity and requesting the service, performing virtual carrier detection control, and the like.
  • updating the NAV of the first station or maintaining the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame including Determining whether the sum of the remaining duration of the first radio frame and the duration of the first transmission opportunity is greater than the NAV; if the determination result is yes, using the sum of the remaining duration of the first radio frame and the duration of the first transmission opportunity The NAV of the first station is updated; if the judgment result is no, the NAV of the first station is maintained unchanged.
  • a site may have multiple corresponding hidden sites.
  • the first site may receive only one wireless frame sent by a hidden site, or may receive different hidden sites in succession.
  • the transmitted radio frame, wherein the duration of the transmission opportunity carried in the radio frame sent by different hidden stations may be different.
  • the first station needs to perform NAV update according to the radio frame sent by different hidden stations. .
  • step S404 is described below in combination with the above two cases:
  • the duration update radio frame duration timer (the radio frame duration timer may be pre-configured); when the radio frame duration timer is zero, determining whether the predetermined variable is greater than the value of NAV; If it is greater than, the NAV is updated by using the predetermined variable; if the judgment result is less than or equal to, the NAV of the first station is maintained unchanged;
  • the second radio frame is received before the radio frame duration timer is zero, and the second radio frame is determined when it is determined that the destination receiving station of the second radio frame is not the first station. Whether the sum of the remaining duration and the second transmission duration carried in the second radio frame is greater than the sum of the predetermined variable and the value of the radio frame duration timer; if the judgment result is greater than, the second transmission opportunity is used
  • the predetermined variable is updated for the duration, and the radio frame duration timer is updated using the remaining duration of the second radio frame described above; if the result of the determination is less than or equal to, the NAV of the first station is maintained unchanged.
  • the above-mentioned NAV update operation or the operation of maintaining the NAV of the first station is repeated, that is, continuing to wait until the radio frame duration is counted.
  • the device is zero, it is judged whether the predetermined variable is greater than the value of the NAV of the first station, and if the judgment result is greater than, the NAV is updated using the predetermined variable, and if the judgment result is less than or equal to the value, the NAV of the first station is not maintained. change.
  • the calculation of the radio frame duration i.e., the transmission time of the radio frame
  • the radio frame duration i.e., the following RXTIME
  • LENGTH in the above formula refers to the value of the LENGTH field in the L-SIG (non-HT (high throughput) SIGNAL field).
  • Table 1 lists the meanings of the symbols used in subsequent calculations.
  • a station receives a radio frame (corresponding to the first radio frame described above), and if the HE-SIG-A is received, the verification is correct, and the received data is received.
  • the information determines that the current radio frame is a HE SU PPDU (wherein the PPDU is an abbreviation of a PHY protocol data unit) (ie, a radio frame whose preamble type is a single user format) or an HE Trigger-based PPDU (ie, The preamble type is a radio frame based on the scheduled uplink format).
  • the above station determines that the radio frame is not a radio frame sent to itself, the station terminates the current reception, and calculates the duration of the remaining portion of the radio frame, and the calculation method is as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A .
  • the station determines that the radio frame is a HE Extended Range SU PPDU (ie, a radio frame whose preamble type is an extended range single user format), after receiving the repeated HE-SIG-A in the radio frame, determining the If the radio frame is not a radio frame sent to itself, the station terminates the current reception and calculates the duration of the remaining portion of the radio frame.
  • the calculation method is as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A -T HE-SIG-AR .
  • the station determines that the radio frame is a HE MU PPDU (ie, a radio frame whose preamble type is a multi-user format), after receiving the HE-SIG-A, determining that the radio frame is not a radio frame sent to itself, The station terminates the current reception and calculates the duration of the remainder of the radio frame as calculated:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A .
  • the station determines that the radio frame is a HE MU PPDU, after receiving the HE-SIG-B, it determines that the radio frame is not a radio frame sent to itself or a HE-SIG-B reception error, the station terminates the current reception. And calculate the duration of the remainder of the radio frame, calculated as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A -T HE-SIG-B .
  • the station may also determine the remaining duration of the radio frame based on the current transmission duration of the radio frame indicated by the L-SIG of the radio frame.
  • the site calculates the value that is ultimately used to update the NAV, as follows:
  • TXOPTIME RTIME+TXOP_DURATION.
  • the PHY layer of the above site sends a PHY-RXEND.indication primitive to the MAC layer (corresponding to the second functional entity described above), indicating early termination, and in the PHY- The RXEND.indication primitive contains TXOPTIME.
  • RTIME and TXOP_DURATION are included in the above primitive, and are calculated by the MAC layer, that is, the sum of RTIME and TXOP_DURATION is calculated by the MAC layer to obtain TXOPTIME.
  • the MAC layer of the above site After the MAC layer of the above site receives a PHY-RXEND.indication primitive indicating the early termination, the MAC layer uses the TXOPTIME (or the TXOPTIME calculated using the MAC layer) included in the PHY-RXEND.indication primitive.
  • the current NAV of the station is compared. When TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • the NAV updated by the above method is more accurate, and can be referred to FIG. 5.
  • AP1 and STA1, STA2 form one BSS.
  • STA1 After the transmitting station STA1 obtains the transmission opportunity, it transmits an HE SU PPDU (corresponding to the first radio frame described above), AP1 is the target receiving station, and STA2 is the listening station (corresponding to the first station described above).
  • STA1 indicates the transmission opportunity duration TXOP_DURATION, the basic service set identifier (BSS color), and the uplink and downlink indication in the HE-SIG-A of the above HE SU PPDU.
  • STA2 judges that the radio frame is a HE SU PPDU through the preamble information
  • STA2 receives the When HE-SIG-A of HE SU PPDU, and the check detection is correct, it is judged that it is not the target receiving station of the HE SU PPDU.
  • STA2 decides to terminate early termination and calculates the duration of the remainder of the radio frame, RTIME(us), as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • STA2 can calculate the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • STA2 uses TXOPTIME to compare with the current NAV of STA2.
  • TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • AP1 and STA1, STA2 form one BSS.
  • the transmitting station STA1 transmits an HE Trigger-based PPDU (corresponding to the first radio frame described above), AP1 is a target receiving station, and STA2 is a listening station (corresponding to the first station described above).
  • STA2 judges that the radio frame is a HE Trigger-based PPDU through the preamble information
  • STA2 receives the HE-SIG-A of the HE Trigger-based PPDU, and the check detection is correct, and determines that it is not the target receiving of the HE Trigger-based PPDU. Site.
  • STA2 decides to terminate early termination and calculates the duration of the remainder of the radio frame. The calculation is as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • STA2 then calculates the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • STA2 uses TXOPTIME to compare with the current NAV of STA2.
  • TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • AP1 and STA1, STA2 form one BSS.
  • STA1 After the transmitting station STA1 obtains the transmission opportunity, it transmits a HE Extended Range SU PPDU (corresponding to the first radio frame described above), AP1 is a target receiving station, and STA2 (corresponding to the first station described above) is a listening station.
  • STA1 When transmitting the above HE Extended Range SU PPDU, STA1 indicates the transmission opportunity duration and the basic service set identifier in the HE-SIG-A of the above HE Extended Range SU PPDU. (BSS color) and up and down instructions.
  • STA2 judges that the radio frame is a HE Extended Range SU PPDU through the preamble information
  • STA2 receives the repeated HE-SIG-A of the HE Extended Range SU PPDU, and the HE-SIG-A check detection is correct, and judges that it is not the HE.
  • the target receiving site for the Extended Range SU PPDU STA2 then decides to terminate early termination and calculates the duration of the remainder of the radio frame. The calculation is as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A -T HE-SIG-AR ;
  • STA2 can calculate the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • STA2 uses TXOPTIME to compare with the current NAV of STA2.
  • TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • AP1 and STA1, STA2 form a BSS, and the generated BSS color is 1.
  • AP2 and STA3 (corresponding to the first station described above) constitute a BSS, and the generated BSS color is 2.
  • STA3 can hear the radio frame sent by AP1.
  • AP1 After obtaining the transmission opportunity, AP1 transmits an HE MU PPDU (corresponding to the first radio frame described above), and the target receiving stations are STA1 and STA2.
  • the STA3 determines that the radio frame is the HE MU PPDU through the preamble information, and the STA3 receives the HE-SIG-A of the HE MU PPDU, and the check detection is correct, the BSS color determines that the radio frame is not the radio transmitted by the AP of the BSS. Frame, STA3 decides to terminate early termination, and calculates the duration of the rest of the radio frame, calculated as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • STA3 then calculates the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • STA3 uses TXOPTIME to compare STA3's current NAV, when TXOPTIME If the current NAV is greater than the current NAV, the NAV is updated with TXOPTIME, otherwise the current NAV is not changed.
  • AP1 and STA1, STA2, and STA3 (corresponding to the first station described above) constitute a basic service set (BSS), and the generated BSS color is 1.
  • AP1 After obtaining the transmission opportunity, AP1 transmits an HE MU PPDU (corresponding to the first radio frame described above), and the target receiving stations are STA1 and STA2.
  • the STA3 determines that the radio frame is the HE MU PPDU by using the preamble information, and the STA3 receives the HE-SIG-A of the HE MU PPDU, and the check detection is correct, the BSS color and the uplink and downlink indications determine that the radio frame is the BSS.
  • the radio frame sent by the AP.
  • the STA3 continues to receive the HE-SIG-B, and it is judged by the HE-SIG-B that the radio frame does not contain its own data, that is, it is determined that it is not the target receiving station of the HE MU PPDU. Then STA3 decides to terminate early termination and calculates the duration of the remainder of the radio frame, as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A -T HE-SIG-B ;
  • STA3 then calculates the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • STA3 uses TXOPTIME to compare with the current NAV of STA3.
  • TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • FIG. 6 is a topological structural diagram of a BSS according to Embodiment 6 of the present invention.
  • AP1 and STA1 form a BSS
  • a BSS Color is 1
  • a working channel bandwidth is 40 MHz
  • a channel is numbered 1 in units of 20 MHz. 2.
  • the 20MHz numbered 1 is the main channel.
  • AP2 and STA2 form a BSS
  • the BSS Color is 2
  • the working channel bandwidth is 20 MHz. It works on the channel with channel number 2, that is, it works on the secondary channel of the channel where AP1 works.
  • AP3 (corresponding to the first station described above) and STA3 form a BSS
  • the BSS Color is 3
  • the working channel bandwidth is 20MHz, working on the channel with channel number 2 above, that is, working on the secondary channel of the channel on which AP1 works.
  • AP3 and AP2 cannot hear each other.
  • AP2 obtains a channel transmission opportunity and transmits an HE SU PPDU (corresponding to the first radio frame described above) to STA2.
  • the AP1 contends for the channel to transmit, and the primary channel retreats to 0, and determines that the secondary channel is busy.
  • AP1 transmits data on the primary channel, but transmits a preamble on the secondary channel (as shown in Figure 7).
  • the BSS Color is indicated to be 1 in the HE-SIG-A of the preamble transmitted by the secondary channel.
  • the AP3 judges that the radio frame is the HE SU PPDU through the preamble information, and the AP3 receives the HE-SIG-A of the HE SU PPDU sent by the AP1, and the check detection is correct, it is determined by the BSS color that it is not the target receiving of the HE SU PPDU. Site. Then AP3 decides to terminate the reception early and calculate the duration of the rest of the radio frame, as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • AP3 then calculates the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • AP3 uses TXOPTIME to compare with the current NAV of AP3. When TXOPTIME is greater than the current NAV, the NAV is updated with TXOPTIME, otherwise the current NAV is not changed.
  • AP1 and STA1, STA2 form one BSS.
  • STA1 After the transmitting station STA1 obtains the transmission opportunity, it transmits an HE SU PPDU (corresponding to the first radio frame described above), AP1 is a target receiving station, and STA2 (corresponding to the first station described above) is a listening station.
  • STA1 indicates the transmission opportunity duration, the symbol length and number of HE LTF, the basic service set identifier (BSS color), and the uplink and downlink indication in the HE-SIG-A of the above HE SU PPDU.
  • BSS color basic service set identifier
  • STA2 judges that the radio frame is a HE SU PPDU through the preamble information
  • STA2 receives the HE-SIG-A of the HE SU PPDU, and the check detection is correct, and determines that it is not the target receiving station of the HE SU PPDU.
  • the physical layer entity of STA2 (corresponding to the first functional entity described above) generates a reception end indication primitive PHY-EXEND.indication, in which the reason for discarding the PPDU and the reception parameter are indicated.
  • the PHY layer of STA2 calculates the duration of the remainder of the radio frame, and the calculation method is as follows:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • the PHY layer of STA2 calculates the value that is ultimately used to update the NAV by the following formula:
  • TXOPTIME RTIME+TXOP_DURATION
  • the PHY layer of STA2 passes TXOPTIME as the receiving parameter of PHY-RXEND.indication to the MAC layer of STA2.
  • the MAC layer of STA2 uses TXOPTIME to compare with the current NAV of STA2. When TXOPTIME is greater than the current NAV, the NAV is updated using TXOPTIME, otherwise the current NAV is not changed.
  • the method of the embodiment of the present invention is described by taking the first functional entity at the physical layer and the second functional entity at the MAC layer as an example.
  • AP1 and STA1 and STA2 form a BSS, and the generated BSS color is 1.
  • AP2 and STA3 (corresponding to the first station described above) constitute a BSS, and the generated BSS color is 2.
  • STA3 can hear the radio frame sent by AP1.
  • AP1 After obtaining the transmission opportunity, AP1 transmits an HE MU PPDU (corresponding to the first radio frame described above), and the target receiving stations are STA1 and STA2.
  • STA3 judges that the radio frame is a HE MU PPDU through the preamble information, and STA3 receives the HE-SIG-A of the HE MU PPDU, and the check detection is correct, it is determined by the BSS color that it is not the target receiving station of the HE MU PPDU. Then STA3 decides to terminate the reception early and calculate the duration of the remaining HE MU PPDUs:
  • RTIME RXTIME-T L-STF -T L-LTF -T L-SIG -T RL-SIG -T HE-SIG-A ;
  • timer timer1 (corresponding to the above-mentioned radio frame duration timer) for locating the end time of the HE MU PPDU. If the MAC layer of STA3 obtains RTIME and timer1 is 0, the calculated timer is used to update timer1. . And use the variable txop_dur (corresponding to the predetermined variable described above) save TXOP_DURATION. When timer1 becomes 0, txop_dur is used to compare with the current NAV of STA3. When txop_dur is greater than the current NAV value, the NAV is updated using txop_dur, otherwise the current NAV is not changed, as shown in FIG.
  • STA3 After receiving the radio frame 1 (corresponding to the first radio frame described above), STA3 judges that it is not the target receiving station of the radio frame by HE-SIG-A or HE-SIG-B, and calculates RTIME1 and TXOP_DURATION1.
  • timer timer1 there is a timer timer1 in STA3 for locating the end time of the HE MU PPDU. After the station obtains the duration of one remaining HE MU PPDU, the timer1 is 0. The calculated duration of the remaining HE MU PPDU is updated with RTIME1, and timer1 follows Time is decreasing. And save TXOP_DURATION1 with the variable txop_dur.
  • the PHY layer of STA3 receives a new radio frame: radio frame 2 (corresponding to the second radio frame described above). It is judged by the HE-SIG-A or HE-SIG-B of the radio frame 2 that STA3 is not the target receiving station of the radio frame, and STA3 calculates RTIME2 and TXOP_DURATION2 of the radio frame 2.
  • STA3 compares the sum of RTIME2 and TXOP_DURATION2 with the sum of timer1 and txop_dur. If the sum of RTIME2 and TXOP_DURATION2 is greater than the sum of timer1 and txop_dur, update timer1 with RTIME2 and TXOP_DURATION2 with txop_dur. Otherwise, timer1 and txop_dur are not changed.
  • the method of the embodiment of the present invention is described by taking the first functional entity at the physical layer and the second functional entity at the MAC layer as an example.
  • AP1 and STA1 form a BSS, and the BSS color is 1.
  • AP2 and STA3 (corresponding to the first station described above) constitute one BSS, and the BSS color is 2.
  • STA3 can hear the radio frame sent by AP1.
  • AP1 After obtaining the transmission opportunity, AP1 transmits an HE MU PPDU (corresponding to the first radio frame described above), and the target receiving stations are STA1 and STA2.
  • AP1 indicates the duration of the current packet transmission in the L-SIG of the above HE MU PPDU, and will be in the above HE MU
  • STA3 After receiving the HE MU PPDU sent by AP1, STA3 calculates the duration of the current HE MU PPDU transmission through the parameters in the L-SIG, and maintains a timer at the physical layer. The timer points to the end of the current PPDU transmission. At the moment. The value of this timer is decremented over time.
  • the PHY layer of STA3 transmits PHY-RXEND.indication (Filtered) to the MAC layer. And indicating the duration of the remaining radio frames in the primitive, the duration of the remaining radio frames being the value of the physical layer timer described above.
  • the primitive also indicates the transmission opportunity duration.
  • the above parameters can also be passed in PHY-RXSTART.indication.
  • the PHY layer of STA3 passes the PHY-RXSTART.indication to the MAC layer, indicating the duration of the remaining radio frames in the primitive, the duration of the remaining radio frames being the value of the physical layer timer described above.
  • the primitive also indicates the transmission opportunity duration.
  • the MAC layer of STA3 uses the sum of the duration of the remaining radio frames indicated in the primitive transmitted by the physical layer and the duration of the transmission opportunity to compare with the current NAV of STA3. When the sum of the above two is greater than the current NAV, the above two are used. The sum of the updates is NAV, otherwise the current NAV is not changed.
  • the HE MU PPDU is transmitted as described in the above embodiment, but can also be used for the HE SU PPDU, the HE extended range SU PPDU, and the HE trigger-based PPDU.
  • the sender of the foregoing embodiment is an AP, the receiver is an STA, and the sender is an STA, and the receiver is an AP.
  • AP1 and STA1 form a BSS, and the BSS color is 1.
  • AP2 and STA3 (corresponding to the first station described above) constitute one BSS, and the BSS color is 2.
  • STA3 can hear the radio frame sent by AP1.
  • AP1 After obtaining the transmission opportunity, AP1 transmits an HE MU PPDU (corresponding to the first radio frame described above), and the target receiving stations are STA1 and STA2.
  • AP1 indicates the duration of the current packet transmission in the L-SIG of the above HE MU PPDU, and indicates the transmission opportunity duration, HE LTF in the HE-SIG-A of the above HE MU PPDU.
  • STA3 calculates the duration of the current HE MU PPDU transmission through the parameters in the L-SIG, and maintains a timer at the physical layer, the timer points to the point at which the current PPDU transmission ends. The value of this timer is decremented over time.
  • STA3 judges that it belongs to the OBSS frame through the HE SIG A of the HE MU PPDU, STA3 triggers early termination of reception.
  • STA3 uses the above timer to know the duration of the remaining PPDU, and STA3 uses the sum of the remaining PPDU duration and the transmission opportunity duration (the txop duration field indication in HE SIG A) to compare with the current NAV of STA3, when the above two And greater than the current NAV, the NAV is updated using the sum of the above two, otherwise the current NAV is not changed.
  • the HE MU PPDU is transmitted as described in the above embodiment, but can also be used for the HE SU PPDU, the HE extended range SU PPDU, and the HE trigger-based PPDU.
  • the sender of the foregoing embodiment is an AP, the receiver is an STA, and the sender is an STA, and the receiver is an AP.
  • the technical solution of the present application may be embodied in the form of a software product in essence or in a form of a software product stored in a storage medium (such as a read-only memory (Read-Only Memory). , referred to as ROM), Random Access Memory (RAM), disk, CD-ROM, includes a number of instructions to make a terminal device (can be a mobile phone, computer, server, or network device, etc.) The method described in the embodiments of the present application is executed.
  • a storage medium such as a read-only memory (Read-Only Memory).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • CD-ROM includes a number of instructions to make a terminal device (can be a mobile phone, computer, server, or network device, etc.)
  • the method described in the embodiments of the present application is executed.
  • a processing device for the NAV is further provided, which is used to implement the foregoing embodiments and optional embodiments, and details are not described herein.
  • the term “module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 10 is a structural block diagram of a processing apparatus for a NAV according to an embodiment of the present invention. As shown in FIG. 10, the apparatus includes a termination module 102 and a processing module 104, which are described below:
  • the termination module 102 is configured to terminate receiving the first radio frame if it is determined that the destination receiving station of the first radio frame being received is not the first station; and the processing module 104 is connected to the termination module 102, configured to be according to the first Remaining duration of the radio frame and the first transmission opportunity duration carried in the first radio frame, updating the NAV of the first station or maintaining the NAV of the first station unchanged, wherein the remaining duration of the first radio frame is After transmitting the first radio frame, the transmission time for transmitting the remaining portion of the first radio frame is terminated.
  • the processing module 104 may be configured to update the NAV of the first station according to the remaining duration of the first radio frame and the first transmission duration carried in the first radio frame by: Or maintaining the NAV of the first station unchanged: determining a remaining duration of the first radio frame according to a preamble type of the first radio frame and a transmission time of the first radio frame; according to the determined remaining duration of the first radio frame And updating the NAV of the first station or maintaining the NAV of the first station unchanged with the first transmission duration carried in the first radio frame.
  • the foregoing first transmission opportunity duration may be determined according to a transmission opportunity duration field of the HE-SIG-A domain in the first radio frame.
  • the processing module 104 may be configured to determine the remaining duration of the first radio frame according to a preamble type of the first radio frame and a transmission time of the first radio frame by: The preamble type of a radio frame determines a termination reception location of the first radio frame at the time of termination reception; determining the remaining duration of the first radio frame according to the transmission time of the first radio frame and the determined termination reception location.
  • the termination receiving locations corresponding to the radio frames of different preamble types may be different. Therefore, determining the first radio frame according to the preamble type of the first radio frame and the transmission time of the first radio frame.
  • the processing module 104 may be configured to determine to terminate the receiving location according to the preamble type of the first radio frame by at least one of the following manners:
  • determining a time point at which the HE-SIG-A in the first radio frame ends is a termination receiving location
  • determining a time point at which the repeated HE-SIG-A in the first radio frame ends is a termination receiving position
  • the preamble type of the first radio frame is a multi-user format
  • determining the HE-SIG in the first radio frame The time point at which -A ends is the termination of the receiving position
  • the HE-SIG in the first radio frame is determined.
  • the point in time at which B ends is the termination of the receiving position.
  • the termination reception position of the first radio frame can be determined according to the preamble type of the first radio frame.
  • the foregoing module may be located in the first site, the termination module 102 may be located in a first functional entity in the first site, and the processing module 104 may be located in the second site in the first site. In the functional entity.
  • the device further includes a sending module, where the sending module is located in the first functional entity, and configured to send a receiving end indication to the second functional entity, where the receiving end indication is used to indicate that the second functional entity is to update the NAV of the first station. Or maintain the NAV of the first site unchanged.
  • a sending module where the sending module is located in the first functional entity, and configured to send a receiving end indication to the second functional entity, where the receiving end indication is used to indicate that the second functional entity is to update the NAV of the first station. Or maintain the NAV of the first site unchanged.
  • two functional entities that is, a first functional entity and a second functional entity, which may perform different actions, may be configured in the first site, where the first functional entity may perform the first wireless Determining the destination site of the frame, and sending a corresponding indication to the second function entity according to the determination result, the second function entity may perform a corresponding action according to the instruction from the first function entity, for example, the second function entity may be based on the first function
  • the receiving end of the entity indicates whether it is necessary to update the NAV of the first station, and performs corresponding processing according to the judgment result.
  • the first functional entity after the first functional entity receives the first radio frame and determines that the destination receiving station of the first radio frame is not the first station, performing the action and the direction of terminating receiving the first radio frame
  • the action of the second function entity to send the reception end indication may be in no particular order.
  • the first functional entity and the second functional entity may be located in different layers in the first site.
  • the first functional entity may be located in a physical layer of the first site, and can perform functions that the physical layer can implement.
  • the second functional entity can be located at In the MAC layer of a station, the functions that the MAC layer can implement can be performed.
  • the foregoing processing module 104 may be located in a second functional entity in the first station, and configured to be carried according to the remaining duration of the first radio frame and the first radio frame according to the foregoing manner.
  • the first transmission opportunity duration updates the NAV of the first station or maintains the NAV of the first station unchanged: updating the NAV of the first station according to a predetermined value carried in the reception end indication or maintaining the NAV of the first station unchanged, wherein And the predetermined value is a sum of a remaining duration of the first radio frame and a duration of the first transmission opportunity; or, updating the foregoing according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the reception end indication
  • the NAV of the first site or the NAV of the first site is unchanged.
  • the reception end indication is sent by the first functional entity to the second functional entity, and therefore, the sum of the remaining duration of the first radio frame in the first radio frame and the duration of the first transmission opportunity may be
  • the first functional entity is carried in the first radio frame after the determination, or the first functional entity may directly carry the remaining duration of the first radio frame and the first transmission opportunity duration in the reception end indication.
  • the processing module 104 may be configured to update the NAV of the first station or maintain the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the reception end indication.
  • the NAV of a station is unchanged: calculating the sum of the remaining duration of the first radio frame carried in the reception end indication and the duration of the first transmission opportunity, according to the calculated and updated NAV of the first station or maintaining the NAV of the first station. constant.
  • the second functional entity may determine the sum of the two by itself, and according to the determined first The sum of the remaining duration of the radio frame and the duration of the first transmission opportunity determines whether the NAV of the first station needs to be updated.
  • the first functional entity may be configured to perform at least one of: detecting a signal strength, transmitting and receiving a wireless frame on a wireless channel, and providing a service to a second functional entity (including but not limited to the foregoing Sending a reception end indication to the second functional entity, and the like; in another optional embodiment, the foregoing second functional entity may be configured to perform at least one of: controlling the access of the first functional entity to the wireless channel, Receiving and decoding a data sheet sent by the first functional entity The element transmits the data unit to the first functional entity and requests the service, performs virtual carrier detection control, and the like.
  • the processing module 104 may be configured to update or maintain the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame.
  • the NAV of the first station is unchanged: determining whether the sum of the remaining duration of the first radio frame and the transmission opportunity duration of the first station is greater than the NAV; and if the determination result is yes, using the remaining duration of the first radio frame
  • the above NAV is updated by the sum of the time and the duration of the first transmission opportunity; if the judgment result is no, the NAV of the first station is maintained unchanged.
  • a site may have multiple corresponding hidden sites.
  • the first site may receive only one wireless frame sent by a hidden site, or may receive different hidden sites in succession.
  • the transmitted radio frame, wherein the duration of the transmission opportunity carried in the radio frame sent by different hidden stations may be different.
  • the first station needs to perform NAV update according to the radio frame sent by different hidden stations. .
  • the processing module 104 may be configured to update the NAV of the first station according to the remaining duration of the first radio frame and the first transmission duration carried in the first radio frame, or Maintaining the NAV of the first station unchanged: storing the first transmission opportunity duration using a predetermined variable, and updating the radio frame duration timer using the remaining duration of the first radio frame (the radio frame duration timer may be pre-configured
  • the radio frame duration timer may be pre-configured
  • the second radio frame is received before the radio frame duration timer is zero, and the second radio frame is determined when it is determined that the destination receiving station of the second radio frame is not the first station. Whether the sum of the remaining duration and the second transmission duration carried in the second radio frame is greater than the sum of the predetermined variable and the value of the radio frame duration timer; if the judgment result is greater than, the second transmission opportunity is used
  • the predetermined variable is updated for the duration, and the radio frame duration timer is updated using the remaining duration of the second radio frame described above; if the result of the determination is less than or equal to, the NAV of the first station is maintained unchanged.
  • the processing module 104 may be configured to update the NAV of the first station according to the remaining duration of the first radio frame and the first transmission opportunity duration carried in the first radio frame. Maintaining the NAV of the first station unchanged: determining a remaining duration of the first radio frame according to a current transmission duration of the first radio frame indicated by the non-high throughput signal domain of the first radio frame; determining the first radio frame according to the first radio frame The remaining duration and the first transmission opportunity duration update the NAV of the first site or maintain the NAV of the first site unchanged.
  • modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are respectively located in multiple processes. In the device.
  • the embodiment of the invention further provides a computer readable storage medium.
  • the computer readable storage medium may be configured to store program code for performing the following steps:
  • Step S1 in case determining that the destination receiving station of the first radio frame being received is not the first station, terminating receiving the first radio frame;
  • Step S2 Update the NAV of the first station or maintain the NAV of the first station according to the remaining duration of the first radio frame and the duration of the first transmission carried in the first radio frame, where the first wireless The remaining duration of the frame is the transmission time for transmitting the remainder of the first radio frame after terminating the reception of the first radio frame.
  • the computer readable storage medium may include, but is not limited to, a U disk, a ROM, a RAM, a mobile hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.
  • the processor performs the operations in the foregoing method embodiments according to the stored program code in the computer readable storage medium.
  • the method for updating the network allocation vector in the embodiment of the present invention can ensure that the network reservation time is updated consistently, ensure the fairness of the transmission and the contention channel, and reduce the collision between the stations.
  • computing devices which may be centralized on a single computing device or distributed over a network of computing devices, optionally implemented in program code executable by the computing device, such that they may be
  • the storage is performed by the computing device in a storage device, and in some cases, the steps shown or described may be performed in an order different than that herein, or they may be fabricated as a single integrated circuit module, or Multiple modules or steps are made into a single integrated circuit module.
  • the application is not limited to any particular combination of hardware and software.
  • the embodiment of the present invention provides a method and a device for processing a network allocation vector, which solves the problem that the NAV update in the related technology is inaccurate, causing collision with a hidden site, thereby achieving the accuracy of ensuring the NAV update, ensuring transmission and The fairness of the competition channel reduces the effect of collisions between hidden sites.

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Abstract

一种网络分配矢量NAV的处理方法，包括：在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收第一无线帧；根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，其中，上述第一无线帧的剩余持续时间为在终止接收第一无线帧后，用于传输上述第一无线帧剩余部分的传输时间。上述技术方案解决了相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题，进而达到了保证NAV更新的准确性，保证传输和竞争信道的公平性，减少隐藏站点间的碰撞的效果。

Description

网络分配矢量的处理方法及装置 技术领域
本申请涉及但不限于通信领域，尤其涉及一种网络分配矢量(NAV，Network Allocation Vector)的处理方法及装置。
背景技术
目前，在无线网络领域，无线局域网(Wireless Local Area Network，简称为WLAN)快速发展，例如，802.11ac技术通过引入更大的信道带宽、更高阶的多输入多输出(Multiple Input Multiple Output，简称为MIMO)等技术，数据速率能够达到1Gbps以上。但是，随着网络密度的增加及用户数目的增多，WLAN网络的效率会出现明显下降的趋势，网络效率的问题不能单纯通过提高传输速率解决。因此，电气和电子工程师协会(Institute for Electrical and Electronic Engineers，简称为IEEE)标准组织成立了TGax任务小组致力于解决WLAN网络效率问题，其中，TGax又称为高效率(High Efficiency，简称为HE)任务组。
在802.11中，一个接入点(access point，简称为AP)以及与AP相关联的多个站点(Station，简称为STA)组成了一个基本服务集(basic service set，简称为BSS)。802.11定义了两种操作模式：分布式协调功能(distributed coordination function，简称为DCF)和点协调功能(point coordination function，简称为PCF)，以及针对这两种操作模式的改进：增强型分布式信道接入功能(enhanced distributed channel access，简称为EDCA)和混合协调功能控制信道接入功能(hybrid coordination function controlled channel access，简称为HCCA)。其中，DCF是最基本的操作模式，利用带有冲突避免的载波侦听多路访问(Carrier Sense Multiple Access with Collision Avoidance，简称为CSMA/CA)机制使多个站点共享无线信道。EDCA是增强型操作模式，将上层数据映射到四个不同的队列接入类别(access categories，简称为AC)：AC_VO(voice，声音)、AC_VI(video，视频)、AC_BE(best effort，最大努力)、AC_BK(background，背景)，每个队列接入类别使用不同的竞 争信道的参数来区分优先级。EDCA利用CSMA/CA机制，使多个不同优先级队列共享无线信道，并预约一个传输机会(Transmission Opportunity，简称为TXOP)。
多个无线站点共享信道时，无线环境的冲突检测变得非常困难，其中一大问题就是隐藏站点。如图1所示，站点A向站点B发送数据，同时站点C也向站点B发送数据，由于站点C和站点A彼此都处于对方的覆盖范围之外，站点A和站点C同时向站点B发送数据将会导致冲突。从站点A的角度来看，站点C即是一个隐藏站点。为解决隐藏站点问题，802.11提出了虚拟信道检测机制，即通过在无线帧的媒体接入控制(Media Access Control，简称为MAC)帧头中包含预约信道时间信息(Duration field，持续时间字段)的方式来避免隐藏站点的碰撞。MAC帧头包含预约信道时间信息保护的是该无线帧结束后的一段时间。其他接收到含有预约信道时间信息的无线帧的旁听站点设置本地存储的一个网络分配矢量(Network Allocation Vector，简称为NAV)，NAV的取值设置为取上述预约信道时间信息和已保留的时间信息二者之间的最大值，在该时间内，旁听站点不会发送数据，从而避免隐藏站点竞争信道，造成碰撞的问题。当NAV减为零后，其他站点才能发送数据。例如，发送方发送请求发送帧(Request To Send，简称为RTS)进行信道预约，RTS包含一个信道预约时间信息，接收方(即，用于接收无线帧的目的站点)响应确认发送帧(Clear To Send，简称为CTS)进行信道预约确认，CTS也包含一个信道预约时间信息，以保证发送方能够完成后续的数据帧交换。设置NAV的示意如图2所示，一般的数据帧交换过程包括发送方发送数据帧，目标接收方成功接收后回复应答帧，图2中RTS/CTS预约的信道时间NAV可以包含多个帧交换过程的时间。图2中，SIFS表示短帧间间隔(Short Interframe Space)。另外，数据帧和应答帧中也可以包含信道预约时间信息。例如，可以不使用RTS/CTS预约的信道时间，而直接发送数据帧，在该数据帧和其应答帧中携带信道预约时间，数据帧的预约时间信息至少包含本次帧交换的应答帧的传输时间，还可以包含接下来的帧交换的时间。
在WLAN系统中，无线帧一般包含物理层帧头部分前导(Preamble)和物理层负载部分物理层服务数据单元(PHY Service Data Unit，简称为PSDU)， 在已经颁布的无线局域网技术标准中，前导包括解码PSDU需要的训练序列和信令指示，例如速率、编码方式等。在IEEE802.11ax中，根据不同的应用场景，定义了四种前导类型：高效率单用户格式(High Efficiency Single-User format，简称为HE SU format)、高效率多用户格式(High Efficiency Multiple-User format，简称为HE MU format)、高效率的基于调度的上行格式(High Efficiency Trigger based UL(Uplink)format)、高效率的扩展范围单用户格式(High Efficiency Extended Range SU format)。其中，在上述前导类型中，用于承载高效率(HE)用户信息的域为高效率信号域A HE-SIG-A和高效率信号域B HE-SIG-B(HE SIG为High Efficiency SIGNAL field的缩写)。其中，HE-SIG-A在所有的上述四种前导类型中都存在。而HE-SIG-B用于指示多用户情况下每个用户的信息，在多用户格式中携带。上述四种前导类型每个域的位置都是确定的，并且通过其他域的指示长度都是可以确定的。比如，在多用户格式下，HE-SIG-A中会指示HE-SIG-B的符号数。扩展范围单用户格式和单用户格式的区别就是对HE-SIG-A进行了重复。即扩展范围单用户格式包含两个HE-SIG-A。
物理层帧头加入了接收方的标识信息，当一个STA检测到一个无线帧，且该无线帧的物理层帧头指示该STA不是该帧的接收者时，该STA可以放弃接收该无线帧的物理层负载部分。这样做的主要目的是避免STA解码与自己无关的数据包，从而节省站点功率。上述接收方标识信息包括基本服务集标识、传输机会持续时间(Transmission Opportunity Duration，简称为TXOP Duration)指示(与上述的MAC中包含的预约信道时间信息是相当的，在不同的层中具有不同的名称)、空间复用信息。下行多用户情况下，接收方的标识信息还包括每个接收方的标识信息等。
第三方站点通过物理层前导中的接收方的标识信息，判断接收提前终止。在相关技术中，当提前终止接收无线帧时，第三方站点只使用TXOP Duration更新NAV，从而导致保护的时间提前，NAV更新不准确，进而出现与隐藏站点之间发生碰撞的问题。
针对相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题，目前尚未提出有效的解决方案。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供了一种网络分配矢量(NAV)的处理方法及装置，以至少解决相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题。
根据本发明实施例的一个方面，提供了一种NAV的处理方法，包括：在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收所述第一无线帧；根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，其中，所述第一无线帧的剩余持续时间为在终止接收所述第一无线帧后，用于传输所述第一无线帧剩余部分的传输时间。
可选地，根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，包括：根据所述第一无线帧的前导类型和所述第一无线帧的传输时间确定所述第一无线帧的所述剩余持续时间；根据确定的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变。
可选地，根据所述第一无线帧的前导类型和所述第一无线帧的传输时间确定所述第一无线帧的所述剩余持续时间包括：根据所述第一无线帧的前导类型确定所述第一无线帧在终止接收时刻的终止接收位置；根据所述第一无线帧的传输时间和确定的所述终止接收位置，确定所述第一无线帧的所述剩余持续时间。
可选地，根据所述第一无线帧的前导类型确定所述第一无线帧在终止接收时刻的所述终止接收位置包括以下至少之一：在所述第一无线帧的前导类型为单用户格式或基于调度的上行格式的情况下，确定所述第一无线帧中的高效率信号域A HE-SIG-A结束的时刻点为所述终止接收位置；在所述第一 无线帧的前导类型为扩展范围单用户格式的情况下，确定所述第一无线帧中的重复的高效率信号域A HE-SIG-A结束的时刻点为所述终止接收位置；在所述第一无线帧的前导类型为多用户格式的情况下，当通过所述第一无线帧中的高效率信号域A HE-SIG-A确定所述目的接收站点不是所述第一站点时，确定所述第一无线帧中的HE-SIG-A结束的时刻点为所述终止接收位置；在所述第一无线帧的前导类型为多用户格式的情况下，当通过所述第一无线帧中的高效率信号域B HE-SIG-B确定所述目的接收站点不是所述第一站点时，确定所述第一无线帧中的HE-SIG-B结束的时刻点为所述终止接收位置。
可选地，在确定正在接收的所述第一无线帧的所述目的接收站点不是所述第一站点的情况下，终止接收所述第一无线帧之前或之后，所述方法还包括：所述第一站点的第一功能实体向所述第一站点的第二功能实体发送接收结束指示，其中，所述接收结束指示用于指示所述第二功能实体更新所述第一站点的NAV或者维持第一站点的NAV不变。
可选地，根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：所述第二功能实体根据所述接收结束指示中携带的预定值更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，其中，所述预定值为所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和；或者，所述第二功能实体根据所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变。
可选地，所述第二功能实体根据所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变包括：所述第二功能实体计算所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和；所述第二功能实体根据计算得到的和更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变。
可选地，所述第一功能实体用于执行以下操作至少之一：检测信号强度，在无线信道上收发无线帧，以及为所述第二功能实体提供服务；和/或，所述 第二功能实体用于执行以下操作至少之一：控制所述第一功能实体对无线信道的接入，接收并解码所述第一功能实体发送的数据单元，发送数据单元给所述第一功能实体并请求服务，进行虚拟载波检测控制。
可选地，根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：判断所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和是否大于所述NAV；在判断结果为是的情况下，利用所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和更新所述第一站点的所述NAV；在判断结果为否的情况下，维持所述第一站点的NAV不变。
可选地，根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：使用预定变量保存所述第一传输机会持续时间，以及使用所述第一无线帧的所述剩余持续时间更新无线帧持续时间计时器；当所述无线帧持续时间计时器为零时，判断所述预定变量是否大于所述NAV的值；在判断结果为大于的情况下，使用所述预定变量更新所述NAV；在判断结果为小于或等于的情况下，维持所述第一站点的NAV不变；或者，当所述无线帧持续时间计时器为零之前，接收第二无线帧；当确定所述第二无线帧的目的接收站点不是所述第一站点时，终止接收所述第二无线帧，判断所述第二无线帧的剩余持续时间和所述第二无线帧中携带的第二传输机会持续时间之和是否大于所述预定变量和所述无线帧持续时间计时器的值之和；在判断结果为大于的情况下，使用所述第二传输机会持续时间更新所述预定变量，并且使用所述第二无线帧的剩余持续时间更新所述无线帧持续时间计时器；在判断结果为小于或等于的情况下，维持所述第一站点的NAV不变。
可选地，根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：根据所述第一无线帧的非高吞吐量信号域指示的所述第一无线帧的当前传输持续时间，确定所述第一无线帧的剩 余持续时间；根据确定的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的NAV或者维持所述第一站点的NAV不变。
根据本发明实施例的另一方面，提供了一种NAV的处理装置，包括：终止模块，设置为在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收所述第一无线帧；处理模块，设置为根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，其中，所述第一无线帧的剩余持续时间为在终止接收所述第一无线帧后，用于传输所述第一无线帧剩余部分的传输时间。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现上述NAV的处理方法。
通过本发明实施例，在对站点的NAV进行更新时，除了考虑发送站点的传输机会持续时间外，还会考虑到发送站点发送的无线帧的剩余持续时间，从而保证了NAV更新的准确性。解决了相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题，进而达到了保证NAV更新的准确性，保证传输和竞争信道的公平性，减少隐藏站点间的碰撞的效果。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是相关技术中的基本服务集示意图；
图2是相关技术中的虚拟载波保护示意图；
图3是相关技术中的NAV提前更新示意图；
图4是根据本发明实施例的NAV的处理方法的流程图；
图5是根据本发明实施例的NAV正确更新的示意图；
图6是根据本发明实施例六的BSS的拓扑结构图；
图7是根据本发明实施例的在辅信道为忙的信道只发送preamble的示意图；
图8是根据本发明实施例的使用计时器方式更新NAV的示意图；
图9是根据本发明实施例的复杂情况下使用计时器方式更新NAV的示意图；
图10是根据本发明实施例的NAV的处理装置的结构框图。
本发明的实施方式
下文中将参考附图并结合实施例来详细说明本申请。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
在相关技术中，如果提前终止接收无线帧时，第三方站点只使用TXOP Duration更新NAV，会造成保护时间短，干扰当前传输的情况。例如，如图3所示情况，站点A向站点B发送无线帧，站点C为旁听站点，由于站点B和站点C互为隐藏站点，站点C通过检测物理帧头判断站点A发送的无线帧不含有自己的数据，且站点C选择丢弃该无线帧并更新NAV。如果第三方站点的MAC层在收到PHY层的接收结束指示后只使用TXOP Duration更新NAV，那么会使得保护的时间提前(如图3虚线所示)，造成原本应该保护的时间(如图3实线所示)没有保护到。这样，站点C就会竞争信道进行发送，干扰站点B发送的确认(Acknowledgment，简称为ACK)消息，造成碰撞。
针对上述问题，在本实施例中提供了一种网络分配矢量(NAV)的处理方法，图4是根据本发明实施例的NAV的处理方法的流程图，如图4所示， 该方法包括如下步骤：
步骤S402，在确定正在接收的第一无线帧的目的接收站点不是第一站点(对应于上述的第三方站点)的情况下，终止接收第一无线帧；
步骤S404，根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，其中，上述第一无线帧的剩余持续时间为在终止接收第一无线帧后，用于传输上述第一无线帧剩余部分的传输时间。
其中，执行上述操作的可以是上述的第一站点。上述的第一传输机会持续时间是第一无线帧的发送站点与第一无线帧的目的接收站点之间传输数据所需要占用的时间，上述第一无线帧是正在接收的无线帧，即，当前无线帧。
通过上述步骤，在对第一站点的NAV进行更新时，除了考虑上述第一传输机会持续时间外，还会考虑到第一无线帧的剩余持续时间，避免了需要保护的时间的提前，保证了NAV更新的准确性。解决了相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题，进而达到了保证NAV更新的准确性，保证传输和竞争信道的公平性，减少隐藏站点间的碰撞的效果。
在一个可选的实施例中，在上述步骤S404中，根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新上述第一站点的NAV或者维持第一站点的NAV不变可以包括：根据第一无线帧的前导类型和第一无线帧的传输时间确定上述第一无线帧的剩余持续时间；根据确定的第一无线帧的所述剩余持续时间和上述第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变。可选地，上述的第一传输机会持续时间可以根据第一无线帧中的HE-SIG-A域的传输机会持续时间字段进行确定。
在一个可选的实施例中，根据所述第一无线帧的前导类型和第一无线帧的传输时间确定第一无线帧的所述剩余持续时间包括：根据第一无线帧的前导类型确定第一无线帧在终止接收时刻的终止接收位置；根据上述第一无线帧的传输时间和确定的终止接收位置，确定第一无线帧的所述剩余持续时间。 在本实施例中，不同的前导类型的无线帧所对应的终止接收位置可以是不同的，因此，在根据上述第一无线帧的前导类型和第一无线帧的传输时间确定第一无线帧的所述剩余持续时间时，可以首先根据第一无线帧的前导类型确定第一无线帧的与该前导类型对应的终止接收位置；在确定了第一无线帧的终止接收位置后，便可以根据第一无线帧的传输时间和上述确定的终止接收位置的差值，确定第一无线帧的剩余持续时间。
下面针对第一无线帧的前导类型与第一无线帧的终止接收位置的对应关系进行说明：
在一个可选的实施例中，根据上述第一无线帧的前导类型确定第一无线帧在终止接收时刻的终止接收位置包括以下至少之一：
在第一无线帧的前导类型为单用户格式或基于调度的上行格式的情况下，确定第一无线帧中的HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为扩展范围单用户格式的情况下，确定第一无线帧中的重复HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为多用户格式的情况下，当通过第一无线帧中的HE-SIG-A确定上述目的接收站点不是第一站点时，确定第一无线帧中的HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为多用户格式的情况下，当通过第一无线帧中的HE-SIG-B确定目的接收站点不是第一站点时，确定第一无线帧中的HE-SIG-B结束的时刻点为终止接收位置。
因此，在进行操作时，可以根据第一无线帧的前导类型确定第一无线帧的终止接收位置。
在一个可选的实施例中，执行上述步骤的主体可以是第一站点，执行上述步骤S402的可以是第一站点中的第一功能实体，执行上述步骤S404的可以是第一站点中的第二功能实体。下面以执行上述步骤的主体是第一站点为例对本发明实施例进行说明：在上述步骤S402之前或之后，还可以执行如下操作：第一站点的第一功能实体向第一站点的第二功能实体发送接收结束指示；其中，该接收结束指示用于指示第二功能实体更新第一站点的NAV 或者维持第一站点的NAV不变。在本实施例中，第一站点中可以设置两个功能实体，即，第一功能实体和第二功能实体，两个功能实体可以执行不同的动作，其中，第一功能实体可以执行第一无线帧的目的站点的判断，并根据判断结果向第二功能实体发送相应指示，第二功能实体可以根据来自第一功能实体的指示执行相应的动作，例如，第二功能实体可以根据来自第一功能实体的接收结束指示判断是否需要更新第一站点的NAV，并根据判断结果执行相应处理。在该实施例中，上述的第一功能实体在接收到了上述第一无线帧且判断出第一无线帧的目的接收站点不是第一站点之后，所执行的终止接收第一无线帧的动作和向第二功能实体发送接收结束指示的动作可以不分先后的。上述的第一功能实体和第二功能实体可以位于第一站点中的不同的层中，例如，第一功能实体可以位于第一站点的物理层中，能够执行物理层所能实现的功能；第二功能实体可以位于第一站点的MAC层中，能够执行MAC层所能实现的功能。
由上述实施例可知，第一站点可以执行图4所示的步骤，下面对第一站点如何执行上述步骤S404进行说明：
在一个可选的实施例中，根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持所述第一站点的NAV不变，包括：上述第二功能实体根据接收结束指示中携带的预定值更新第一站点的所述NAV或者维持第一站点的NAV不变，其中，该预定值为第一无线帧的剩余持续时间和第一传输机会持续时间之和；或者，上述第二功能实体根据接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间更新上述第一站点的NAV或者维持第一站点的NAV不变。在该实施例中，接收结束指示是由第一功能实体发送给第二功能实体的，因此，第一无线帧的剩余持续时间和第一传输机会持续时间之和可以是由第一功能实体在确定之后携带在第一无线帧中的，或者，第一功能实体可以直接在接收结束指示中携带第一无线帧的剩余持续时间和第一传输机会持续时间。
在一个可选的实施例中，第二功能实体根据接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间更新第一站点的NAV或者 维持第一站点的NAV不变包括：第二功能实体计算接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间之和，第二功能实体根据计算得到的和更新第一站点的NAV或者维持第一站点的NAV不变。在该实施例中，当第一无线帧中携带的是第一无线帧的剩余持续时间和第一传输机会持续时间时，第二功能实体可以自己确定二者之和，并根据确定的第一无线帧的剩余持续时间和第一传输机会持续时间之和判断是否需要更新上述第一站点的NAV。
下面对上述实施例中的第一功能实体和第二功能实体执行的操作进行说明：
在一个可选的实施例中，上述第一功能实体可以用于执行以下操作至少之一：检测信号强度，在无线信道上收发无线帧，以及为第二功能实体提供服务(包括但不限于上述的向第二功能实体发送接收结束指示)等；在另一个可选的实施例中，上述第二功能实体可以用于执行以下操作至少之一：控制第一功能实体对无线信道的接入，接收并解码第一功能实体发送的数据单元，发送数据单元给第一功能实体并请求服务，进行虚拟载波检测控制等。
在一个可选的实施例中，根据第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，包括：判断第一无线帧的剩余持续时间和第一传输机会持续时间之和是否大于NAV；在判断结果为是的情况下，利用第一无线帧的剩余持续时间和第一传输机会持续时间之和更新上述第一站点的NAV；在判断结果为否的情况下，维持第一站点的NAV不变。
在实际应用时，一个站点(例如，上述的第一站点)可能会有多个对应的隐藏站点，第一站点可以仅接收到一个隐藏站点发送的无线帧，也可以先后接收到不同的隐藏站点发送的无线帧，其中，不同的隐藏站点发送的无线帧中携带的传输机会持续时间可能是不同的，在该情况下，第一站点需要根据不同的隐藏站点发送的无线帧来进行NAV的更新。
下面结合上述两种情况对上述步骤S404进行说明：
在一个可选的实施例中，根据上述第一无线帧的剩余持续时间和第一无 线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，包括：使用预定变量保存上述第一传输机会持续时间，以及使用第一无线帧的剩余持续时间更新无线帧持续时间计时器(该无线帧持续时间计时器可以是预先配置好的)；当上述无线帧持续时间计时器为零时，判断预定变量是否大于NAV的值；在判断结果为大于的情况下，使用上述预定变量更新NAV；在判断结果为小于或等于的情况下，维持第一站点的NAV不变；
在另一个可选的实施例中，当上述无线帧持续时间计时器为零之前，接收第二无线帧；当确定上述第二无线帧的目的接收站点不是第一站点时，判断第二无线帧的剩余持续时间和第二无线帧中携带的第二传输机会持续时间之和是否大于预定变量和无线帧持续时间计时器的值之和；在判断结果为大于的情况下，使用第二传输机会持续时间更新预定变量，并且使用上述第二无线帧的剩余持续时间更新无线帧持续时间计时器；在判断结果为小于或等于的情况下，维持第一站点的NAV不变。在本实施例中，当预定变量和无线帧持续时间计时器进行了更新之后，会重复执行上述的NAV更新操作或者维持第一站点的NAV不变的操作，即，继续等到无线帧持续时间计时器为零时，判断预定变量是否大于第一站点的NAV的值，并且在判断结果为大于的情况下使用预定变量更新NAV，在判断结果为小于或等于的情况下维持第一站点的NAV不变。
在上述实施例中，涉及到了无线帧持续时间(即，无线帧的传输时间)的计算，在进行无线帧持续时间(即，下述的RXTIME)计算时，可以通过如下公式进行计算：
Figure PCTCN2016097785-appb-000001
其中，上述公式中的LENGTH是指L-SIG(non-HT(high throughput)SIGNAL field，非高吞吐量信号域)中的LENGTH域的值。
需要说明的是，无线帧持续时间的计算以及下面实施例中所有的计算都是在单位统一的情况下进行的运算。
表1中列举了在后续的计算中会用到的符号表示的含义。
表1
缩略语 英文含义 中文解释
TL-STF Non-HT Short Training field duration 非HT短训练序列时长
TL-LTF Non-HT Long Training field duration 非HT长训练序列时长
TL-SIG Non-HT SIGNAL field duration 非HT信号域时长
TRL-SIG Repeat Non-HT SIGNAL field duration 重复非HT信号域时长
THE-SIG-A HE SIGNAL A field duration HE SIG A域时长
THE-SIG-A-R Repeat HE SIGNAL A field duration 重复HE SIG A域时长
THE-SIG-B HE SIGNAL B field duration HE SIG B域时长
在实际应用中，站点(例如，上述的第一站点)对无线帧(对应于上述的第一无线帧)进行接收，如果在HE-SIG-A接收完毕，校验正确，通过已经接收到的信息判断出当前无线帧为HE SU PPDU(其中，PPDU为物理层协议数据单元(PHY protocol data unit)的缩写)(即，前导类型为单用户格式的无线帧)或HE Trigger-based PPDU(即，前导类型为基于调度的上行格式的无线帧)。上述站点在接收完HE-SIG-A后，判断出该无线帧不是发送给自己的无线帧，则站点终止当前的接收，并且计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A。
如果上述站点在判断出无线帧为HE Extended Range SU PPDU(即，前导类型为扩展范围单用户格式的无线帧)，在接收完该无线帧中的重复的HE-SIG-A后，判断出该无线帧不是发送给自己的无线帧，则站点终止当前的接收，并且计算无线帧剩余部分持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A-THE-SIG-A-R。
如果上述站点在判断出无线帧为HE MU PPDU(即，前导类型为多用户格式的无线帧)，在接收完HE-SIG-A后，判断出该无线帧不是发送给自己的无线帧，则站点终止当前的接收，并且计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A。
如果上述站点在判断出无线帧为HE MU PPDU，在接收完HE-SIG-B后，判断出该无线帧不是发送给自己的无线帧或者HE-SIG-B接收错误，则站点终止当前的接收，并且计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A-THE-SIG-B。
在一个可选实施例中，站点还可以根据所述无线帧的L-SIG指示的所述无线帧的当前传输持续时间，确定所述无线帧的剩余持续时间。
然后，站点计算最终用于更新NAV的值，计算方法如下：
TXOPTIME＝RTIME+TXOP_DURATION。
可选地，上述站点的PHY层(对应于上述的第一功能实体)向MAC层(对应于上述的第二功能实体)发送PHY-RXEND.indication原语，指示为提前终止，并且在PHY-RXEND.indication原语中包含TXOPTIME。或者，在上述原语中包括RTIME和TXOP_DURATION，由MAC层进行计算，即，由MAC层计算RTIME与TXOP_DURATION的和，以得到TXOPTIME。而上述站点的MAC层在收到一个指示为提前结束的PHY-RXEND.indication原语后，MAC层使用该PHY-RXEND.indication原语中包含的TXOPTIME(或者使用MAC层计算得到的TXOPTIME)与站点当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前的NAV。通过上述方式更新后的NAV更准确，可参考图5。
下面结合具体实施例对本发明实施例进行说明。
实施例一
在本实施例中，AP1和STA1、STA2组成一个BSS。发送站点STA1获得传输机会后，发送HE SU PPDU(对应于上述的第一无线帧)，AP1是目标接收站点，STA2是旁听站点(对应于上述的第一站点)。STA1在发送上述HE SU PPDU时，会在上述HE SU PPDU的HE-SIG-A中指示传输机会持续时间TXOP_DURATION、基本服务集标识(BSS color)以及上下行指示。
当STA2通过前导信息判断该无线帧为HE SU PPDU，STA2接收完该 HE SU PPDU的HE-SIG-A时，并且校验检测正确，判断自己不是该HE SU PPDU的目标接收站点。则STA2决定提前终止结束，并计算无线帧剩余部分的持续时间RTIME(us)，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
然后，STA2可以通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA2使用TXOPTIME与STA2当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例二
在本实施例中，AP1和STA1、STA2组成一个BSS。发送站点STA1发送HE Trigger-based PPDU(对应于上述的第一无线帧)，AP1是目标接收站点，STA2是旁听站点(对应于上述的第一站点)。
当STA2通过前导信息判断该无线帧为HE Trigger-based PPDU，STA2接收完该HE Trigger-based PPDU的HE-SIG-A时，并且校验检测正确，判断自己不是HE Trigger-based PPDU的目标接收站点。则STA2决定提前终止结束，并计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
然后，STA2通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA2使用TXOPTIME与STA2当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例三
在本实施例中，AP1和STA1、STA2组成一个BSS。发送站点STA1获得传输机会后，发送HE Extended Range SU PPDU(对应于上述的第一无线帧)，AP1是目标接收站点，STA2(对应于上述的第一站点)是旁听站点。STA1在发送上述HE Extended Range SU PPDU时，会在上述HE Extended Range SU PPDU的HE-SIG-A中指示传输机会持续时间、基本服务集标识 (BSS color)以及上下行指示。
当STA2通过前导信息判断该无线帧为HE Extended Range SU PPDU，STA2接收完该HE Extended Range SU PPDU的重复HE-SIG-A时，并且HE-SIG-A校验检测正确，判断自己不是该HE Extended Range SU PPDU的目标接收站点。则STA2决定提前终止结束，并计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A-THE-SIG-A-R；
然后，STA2可以通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA2使用TXOPTIME与STA2当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例四
在本实施例中，AP1和STA1、STA2组成一个BSS，产生的BSS color为1。AP2和STA3(对应于上述的第一站点)组成一个BSS，产生的BSS color为2。STA3能够侦听到AP1发送的无线帧。
AP1获得传输机会后，发送HE MU PPDU(对应于上述的第一无线帧)，目标接收站点为STA1和STA2。AP1在发送上述HE MU PPDU时，会在上述HE MU PPDU的HE-SIG-A中指示传输机会持续时间和基本服务集标识(BSS color＝1)。
当STA3通过前导信息判断该无线帧为HE MU PPDU，STA3接收完该HE MU PPDU的HE-SIG-A时，并且校验检测正确，通过BSS color判断该无线帧不是所属BSS的AP发送的无线帧，STA3决定提前终止结束，并计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
然后，STA3通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA3使用TXOPTIME与STA3当前的NAV进行比较，当TXOPTIME 大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例五
在本实施例中，AP1和STA1、STA2、STA3(对应于上述的第一站点)组成一个基本服务集(BSS)，产生的BSS color为1。
AP1获得传输机会后，发送HE MU PPDU(对应于上述的第一无线帧)，目标接收站点为STA1和STA2。AP1在发送上述HE MU PPDU时，会在上述HE MU PPDU的HE-SIG-A中指示传输机会持续时间、基本服务集标识(BSS color＝1)，并且在HE-SIG-B指示STA1和STA2的标识和相应的资源位置。
当STA3通过前导信息判断该无线帧为HE MU PPDU，STA3接收完该HE MU PPDU的HE-SIG-A时，并且校验检测正确，通过BSS color和上下行指示判断该无线帧是所述BSS的AP发送的无线帧。STA3继续接收HE-SIG-B，通过HE-SIG-B判断该无线帧不包含自己的数据，即判断出自己不是该HE MU PPDU的目标接收站点。则STA3决定提前终止结束，并计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A-THE-SIG-B；
然后，STA3通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA3使用TXOPTIME与STA3当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例六
图6是根据本发明实施例六的BSS的拓扑结构图，如图6所示，AP1和STA1组成一个BSS，BSS Color为1，工作信道带宽为40MHz，信道以20MHz为单位进行编号为1和2。其中，编号为1的20MHz为主信道。AP2和STA2组成一个BSS，BSS Color为2，工作信道带宽为20MHz，工作在上述信道编号为2的信道上，即工作在AP1工作的信道的辅信道上。AP3(对应于上述的第一站点)和STA3组成一个BSS，BSS Color为3，工作信道带宽为 20MHz，工作在上述信道编号为2的信道上，即工作在AP1工作的信道的辅信道上。AP3和AP2相互听不到。
AP2获得信道传输机会，向STA2发送HE SU PPDU(对应于上述的第一无线帧)。AP1竞争信道进行发送，在主信道退避到0，判断辅信道为忙。这个时候，AP1在主信道发送数据，但是在辅信道发送preamble(如图7所示)。在辅信道发送的preamble的HE-SIG-A中指示BSS Color为1。
当AP3通过前导信息判断该无线帧为HE SU PPDU，AP3接收完AP1发送的HE SU PPDU的HE-SIG-A时，并且校验检测正确，通过BSS color判断自己不是该HE SU PPDU的目标接收站点。则AP3决定提前终止接收并计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
然后，AP3通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
AP3使用TXOPTIME与AP3当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例七
在本实施例中，AP1和STA1、STA2组成一个BSS。发送站点STA1获得传输机会后，发送HE SU PPDU(对应于上述的第一无线帧)，AP1是目标接收站点，STA2(对应于上述的第一站点)是旁听站点。STA1在发送上述HE SU PPDU时，会在上述HE SU PPDU的HE-SIG-A中指示传输机会持续时间、HE LTF的符号长度及个数、基本服务集标识(BSS color)以及上下行指示。
当STA2通过前导信息判断该无线帧为HE SU PPDU，STA2接收完该HE SU PPDU的HE-SIG-A时，并且校验检测正确，判断自己不是该HE SU PPDU的目标接收站点。则STA2的物理层实体(对应于上述的第一功能实体)会产生一个接收结束指示原语PHY-EXEND.indication，在该原语中指示丢弃PPDU的原因以及接收参数。STA2的PHY层计算无线帧剩余部分的持续时间，计算方法如下：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
然后，STA2的PHY层通过如下公式计算最终用于更新NAV的值：
TXOPTIME＝RTIME+TXOP_DURATION；
STA2的PHY层将TXOPTIME作为PHY-RXEND.indication的接收参数传递给STA2的MAC层。
STA2的MAC层使用TXOPTIME与STA2当前的NAV进行比较，当TXOPTIME大于当前的NAV，则使用TXOPTIME更新NAV，否则不改变当前NAV。
实施例八
在本实施例中，以第一功能实体位于物理层，第二功能实体位于MAC层为例，对本发明实施例的方法进行描述。
AP1和STA1、STA2组成一个BSS，产生的BSS color为1。AP2和STA3(对应于上述的第一站点)组成一个BSS，产生的BSS color为2。STA3能够侦听到AP1发送的无线帧。
AP1获得传输机会后，发送HE MU PPDU(对应于上述的第一无线帧)，目标接收站点为STA1和STA2。AP1在发送上述HE MU PPDU时，会在上述HE MU PPDU的HE-SIG-A中指示传输机会持续时间、HE LTF的符号长度及个数、基本服务集标识(BSS color＝1)以及上下行指示、HE-SIG-B占用的符号数。
当STA3通过前导信息判断该无线帧为HE MU PPDU，STA3接收完该HE MU PPDU的HE-SIG-A时，并且校验检测正确，通过BSS color判断自己不是该HE MU PPDU的目标接收站点。则STA3决定提前终止接收，计算剩余HE MU PPDU的持续时间：
RTIME＝RXTIME-TL-STF-TL-LTF-TL-SIG-TRL-SIG-THE-SIG-A；
STA3中存在一个计时器timer1(对应于上述的无线帧持续时间计时器)，用于定位该HE MU PPDU的结束时间，如果STA3的MAC层得到RTIME，timer1为0，使用计算得到的RTIME1更新timer1。并且使用变量txop_dur (对应于上述的预定变量)保存TXOP_DURATION。当timer1变为0时，使用txop_dur与STA3当前的NAV进行比较，当txop_dur大于当前NAV的值，则使用txop_dur更新NAV，否则不改变当前NAV，如图8所示。
在更复杂的情况下，如图9所示。STA3收到无线帧1(对应于上述的第一无线帧)后，通过HE-SIG-A或HE-SIG-B判断自己不是该无线帧的目标接收站点，计算RTIME1和TXOP_DURATION1。
STA3中存在一个计时器timer1用于定位HE MU PPDU的结束时间，站点得到一个剩余HE MU PPDU的持续时间后，timer1为0，使用计算得到的剩余HE MU PPDU的持续时间更新RTIME1，timer1随着时间在递减。并且使用变量txop_dur保存TXOP_DURATION1。
在timer1变成0之前，STA3的PHY层又收到新的无线帧：无线帧2(对应于上述的第二无线帧)。通过无线帧2的HE-SIG-A或HE-SIG-B判断STA3不是该无线帧的目标接收站点，则STA3计算无线帧2的RTIME2和TXOP_DURATION2。
这个时候，由于timer1不是0。STA3使用RTIME2和TXOP_DURATION2之和与timer1和txop_dur之和进行比较。如果RTIME2和TXOP_DURATION2之和大于timer1和txop_dur之和，则使用RTIME2更新timer1，使用txop_dur保存TXOP_DURATION2。否则，不改变timer1和txop_dur。
实施例九
在本实施例中，以第一功能实体位于物理层，第二功能实体位于MAC层为例，对本发明实施例的方法进行描述。
AP1和STA1、STA2组成一个BSS，BSS color为1。AP2和STA3(对应于上述的第一站点)组成一个BSS，BSS color为2。STA3能够侦听到AP1发送的无线帧。
AP1获得传输机会后，发送HE MU PPDU(对应于上述的第一无线帧)，目标接收站点为STA1和STA2。AP1在发送上述HE MU PPDU时，会在上述HE MU PPDU的L-SIG中指示当前包传输的持续时间，并会在上述HE MU  PPDU的HE-SIG-A中指示传输机会持续时间、HE LTF的符号长度及个数、基本服务集标识(BSS color＝1)以及上下行指示、HE-SIG-B占用的符号数。
STA3接到AP1发送的HE MU PPDU后，通过L-SIG中的参数计算出当前HE MU PPDU传输的持续时间，并在物理层维护一个计时器，该计时器指向的终点为当前PPDU传输结束的时刻点。该计时器的值随着时间进行递减。
当STA3通过该HE MU PPDU的HE SIG A判断属于OBSS(Overlap Basic Service Set，重叠的基本服务集)帧，可以进行包过滤，这个时候STA3的PHY层向MAC层传递PHY-RXEND.indication(Filtered)，并且在该原语中指示剩余无线帧的持续时间，该剩余无线帧的持续时间为上述物理层计时器的值。此外，该原语中还指示传输机会持续时间。
此外，上述参数也可以在PHY-RXSTART.indication进行传递。STA3的PHY层向MAC层传递PHY-RXSTART.indication，在该原语中指示剩余无线帧的持续时间，该剩余无线帧的持续时间为上述物理层计时器的值。此外，该原语中还指示传输机会持续时间。
STA3的MAC层使用物理层传递的原语中指示的剩余无线帧的持续时间和传输机会持续时间之和与STA3当前的NAV进行比较，当上述两者之和大于当前的NAV，则使用上述两者之和更新NAV，否则不改变当前NAV。
上述实施例描述的发送的是HE MU PPDU，但是也可以用于HE SU PPDU、HE extended range SU PPDU和HE trigger-based PPDU。上述实施例的发送方是AP，接收方是STA，也可以用于发送方是STA，接收方是AP。
实施例十
AP1和STA1、STA2组成一个BSS，BSS color为1。AP2和STA3(对应于上述的第一站点)组成一个BSS，BSS color为2。STA3能够侦听到AP1发送的无线帧。
AP1获得传输机会后，发送HE MU PPDU(对应于上述的第一无线帧)，目标接收站点为STA1和STA2。AP1在发送上述HE MU PPDU时，会在上述HE MU PPDU的L-SIG中指示当前包传输的持续时间，并会在上述HE MU PPDU的HE-SIG-A中指示传输机会持续时间、HE LTF的符号长度及个数、 基本服务集标识(BSS color＝1)以及上下行指示、HE-SIG-B占用的符号数。
当STA3通过L-SIG中的参数计算出当前HE MU PPDU传输的持续时间，并在物理层维护一个计时器，该计时器指向的终点为当前PPDU传输结束的时刻点。该计时器的值随着时间进行递减。当STA3通过该HE MU PPDU的HE SIG A判断属于OBSS帧，STA3触发提前终止接收。STA3使用上述计时器知道剩余PPDU的持续时间，STA3使用该剩余PPDU持续时间和传输机会持续时间之和(HE SIG A中的txop duration域指示)与STA3当前的NAV进行比较，当上述两者之和大于当前的NAV，则使用上述两者之和更新NAV，否则不改变当前NAV。
上述实施例描述的发送的是HE MU PPDU，但是也可以用于HE SU PPDU、HE extended range SU PPDU和HE trigger-based PPDU。上述实施例的发送方是AP，接收方是STA，也可以用于发送方是STA，接收方是AP。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对相关技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本申请实施例所述的方法。
在本实施例中还提供了一种NAV的处理装置，该装置用于实现上述实施例及可选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图10是根据本发明实施例的NAV的处理装置的结构框图，如图10所示，该装置包括终止模块102和处理模块104，下面对该装置进行说明：
终止模块102，设置为在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收第一无线帧；处理模块104，连接至上述终止模块102，设置为根据第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，其中，该第一无线帧的剩余持续时间为在终止接收第一无线帧后，用于传输第一无线帧剩余部分的传输时间。
在一个可选的实施例中，上述的处理模块104可以设置为通过如下方式根据第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间更新上述第一站点的NAV或者维持第一站点的NAV不变：根据第一无线帧的前导类型和第一无线帧的传输时间确定上述第一无线帧的剩余持续时间；根据确定的第一无线帧的所述剩余持续时间和上述第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变。可选地，上述的第一传输机会持续时间可以根据第一无线帧中的HE-SIG-A域的传输机会持续时间字段进行确定。
在一个可选的实施例中，上述的处理模块104可以设置为通过如下方式根据第一无线帧的前导类型和第一无线帧的传输时间确定第一无线帧的所述剩余持续时间：根据第一无线帧的前导类型确定第一无线帧在终止接收时刻的终止接收位置；根据上述第一无线帧的传输时间和确定的终止接收位置确定第一无线帧的所述剩余持续时间。在本实施例中，不同的前导类型的无线帧所对应的终止接收位置可以是不同的，因此，在根据上述第一无线帧的前导类型和第一无线帧的传输时间确定第一无线帧的所述剩余持续时间时，可以首先根据第一无线帧的前导类型确定第一无线帧的与该前导类型对应的终止接收位置；在确定了第一无线帧的终止接收位置后，便可以根据第一无线帧的传输时间和上述确定的终止接收位置的差值确定第一无线帧的剩余持续时间。
在一个可选的实施例中，上述的处理模块104可以设置为通过如下方式至少之一根据上述第一无线帧的前导类型确定终止接收位置：
在第一无线帧的前导类型为单用户格式或基于调度的上行格式的情况下，确定第一无线帧中的HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为扩展范围单用户格式的情况下，确定第一无线帧中的重复HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为多用户格式的情况下，当通过第一无线帧中的HE-SIG-A确定上述目的接收站点不是第一站点时，确定第一无线帧中的HE-SIG-A结束的时刻点为终止接收位置；
在第一无线帧的前导类型为多用户格式的情况下，当通过第一无线帧中的HE-SIG-B确定目的接收站点不是第一站点时，确定第一无线帧中的HE-SIG-B结束的时刻点为终止接收位置。
因此，在进行操作时，可以根据第一无线帧的前导类型确定第一无线帧的终止接收位置。
在一个可选的实施例中，上述模块可以位于第一站点中，上述的终止模块102可以位于第一站点中的第一功能实体中，上述的处理模块104可以位于第一站点中的第二功能实体中。
下面以上述模块位于第一站点中为例对本发明实施例进行说明：
上述装置还包括发送模块，该发送模块可以位于第一功能实体中，设置为向第二功能实体发送接收结束指示；其中，该接收结束指示用于指示第二功能实体要更新第一站点的NAV或者维持第一站点的NAV不变。在本实施例中，第一站点中可以设置两个功能实体，即，第一功能实体和第二功能实体，两个功能实体可以执行不同的动作，其中，第一功能实体可以执行第一无线帧的目的站点的判断，并根据判断结果向第二功能实体发送相应指示，第二功能实体可以根据来自第一功能实体的指示执行相应的动作，例如，第二功能实体可以根据来自第一功能实体的接收结束指示判断是否需要更新第一站点的NAV，并根据判断结果执行相应处理。在该实施例中，上述的第一功能实体在接收到了上述第一无线帧且判断出第一无线帧的目的接收站点不是第一站点之后，所执行的终止接收第一无线帧的动作和向第二功能实体发送接收结束指示的动作可以不分先后的。上述的第一功能实体和第二功能实体可以位于第一站点中的不同的层中，例如，第一功能实体可以位于第一站点的物理层中，能够执行物理层所能实现的功能；第二功能实体可以位于第 一站点的MAC层中，能够执行MAC层所能实现的功能。
在一个可选的实施例中，上述的处理模块104可以位于第一站点中的第二功能实体中，设置为通过如下方式根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间更新第一站点的NAV或者维持所述第一站点的NAV不变：根据接收结束指示中携带的预定值更新第一站点的NAV或者维持第一站点的NAV不变，其中，该预定值为第一无线帧的剩余持续时间和第一传输机会持续时间之和；或者，根据接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间，更新上述第一站点的NAV或者维持第一站点的NAV不变。在该实施例中，接收结束指示是由第一功能实体发送给第二功能实体的，因此，第一无线帧中的第一无线帧的剩余持续时间和第一传输机会持续时间之和可以是由第一功能实体在确定之后携带在第一无线帧中的，或者，第一功能实体可以直接在接收结束指示中携带第一无线帧的剩余持续时间和第一传输机会持续时间。
在一个可选的实施例中，上述处理模块104可以设置为通过如下方式根据接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间更新第一站点的NAV或者维持第一站点的NAV不变：计算接收结束指示中携带的第一无线帧的剩余持续时间和第一传输机会持续时间之和，根据计算得到的和更新第一站点的NAV或者维持第一站点的NAV不变。在该实施例中，当第一无线帧中携带的是第一无线帧的剩余持续时间和第一传输机会持续时间时，第二功能实体可以自己确定二者之和，并根据确定的第一无线帧的剩余持续时间和第一传输机会持续时间之和判断是否需要更新上述第一站点的NAV。
下面对上述实施例中的第一功能实体和第二功能实体执行的操作进行说明：
在一个可选的实施例中，上述第一功能实体可以用于执行以下操作至少之一：检测信号强度，在无线信道上收发无线帧，以及为第二功能实体提供服务(包括但不限于上述的向第二功能实体发送接收结束指示)等；在另一个可选的实施例中，上述第二功能实体可以用于执行以下操作至少之一：控制第一功能实体对无线信道的接入，接收并解码第一功能实体发送的数据单 元，发送数据单元给第一功能实体并请求服务，进行虚拟载波检测控制等。
在一个可选的实施例中，上述处理模块104可以设置为通过如下方式根据第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间更新第一站点的NAV或者维持第一站点的NAV不变：判断第一无线帧的剩余持续时间和第一站点的传输机会持续时间之和是否大于NAV，；在判断结果为是的情况下，利用第一无线帧的剩余持续时间和第一传输机会持续时间之和更新上述NAV；在判断结果为否的情况下，维持第一站点的NAV不变。
在实际应用时，一个站点(例如，上述的第一站点)可能会有多个对应的隐藏站点，第一站点可以仅接收到一个隐藏站点发送的无线帧，也可以先后接收到不同的隐藏站点发送的无线帧，其中，不同的隐藏站点发送的无线帧中携带的传输机会持续时间可能是不同的，在该情况下，第一站点需要根据不同的隐藏站点发送的无线帧来进行NAV的更新。
下面结合上述两种情况对处理模块104中的操作进行说明：
在一个可选的实施例中，上述处理模块104可以设置为通过如下方式根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间更新第一站点的NAV或者维持第一站点的NAV不变：使用预定变量保存上述第一传输机会持续时间，以及使用第一无线帧的剩余持续时间更新无线帧持续时间计时器(该无线帧持续时间计时器可以是预先配置好的)；当上述无线帧持续时间计时器为零时，判断预定变量是否大于NAV的值；在判断结果为大于的情况下，使用上述预定变量更新NAV；在判断结果为小于或等于的情况下，维持第一站点的NAV不变；
在另一个可选的实施例中，当上述无线帧持续时间计时器为零之前，接收第二无线帧；当确定上述第二无线帧的目的接收站点不是第一站点时，判断第二无线帧的剩余持续时间和第二无线帧中携带的第二传输机会持续时间之和是否大于预定变量和无线帧持续时间计时器的值之和；在判断结果为大于的情况下，使用第二传输机会持续时间更新预定变量，并且使用上述第二无线帧的剩余持续时间更新无线帧持续时间计时器；在判断结果为小于或等于的情况下，维持第一站点的NAV不变。
在一个可选的实施例中，上述处理模块104可以设置为通过如下方式根据第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变：根据第一无线帧的非高吞吐量信号域指示的第一无线帧的当前传输持续时间，确定第一无线帧的剩余持续时间；根据确定的第一无线帧的剩余持续时间和第一传输机会持续时间更新第一站点的NAV或者维持第一站点的NAV不变。
需要说明的是，上述模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述模块分别位于多个处理器中。
本发明实施例还提供了一种计算机可读存储介质。可选地，在本实施例中，上述计算机可读存储介质可以被设置为存储用于执行以下步骤的程序代码：
步骤S1，在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收第一无线帧；
步骤S2，根据上述第一无线帧的剩余持续时间和第一无线帧中携带的第一传输机会持续时间，更新第一站点的NAV或者维持第一站点的NAV不变，其中，上述第一无线帧的剩余持续时间为在终止接收第一无线帧后，用于传输上述第一无线帧剩余部分的传输时间。
可选地，在本实施例中，上述计算机可读存储介质可以包括但不限于：U盘、ROM、RAM、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据计算机可读存储介质中已存储的程序代码执行上述方法实施例中的操作。
可选地，本实施例中的示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
通过本发明实施例中的网络分配矢量的更新方法，能够保证网络预留时间更新一致，保证传输和竞争信道的公平性，减少站点之间的碰撞。
本领域的技术人员应该明白，上述的本申请的模块或步骤可以用通用的 计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成单个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本申请不限制于任何特定的硬件和软件结合。
以上所述仅为本申请的可选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。
工业实用性
本申请实施例提供一种网络分配矢量的处理方法及装置，解决了相关技术中存在的NAV更新不准确，导致与隐藏站点发生碰撞的问题，进而达到了保证NAV更新的准确性，保证传输和竞争信道的公平性，减少隐藏站点间的碰撞的效果。

Claims (12)

  1. 一种网络分配矢量NAV的处理方法，包括：
    在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收所述第一无线帧；
    根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，其中，所述第一无线帧的剩余持续时间为在终止接收所述第一无线帧后，用于传输所述第一无线帧剩余部分的传输时间。
  2. 根据权利要求1所述的方法，其中，所述根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，包括：
    根据所述第一无线帧的前导类型和所述第一无线帧的传输时间确定所述第一无线帧的所述剩余持续时间；
    根据确定的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变。
  3. 根据权利要求2所述的方法，其中，所述根据所述第一无线帧的前导类型和所述第一无线帧的传输时间确定所述第一无线帧的所述剩余持续时间包括：
    根据所述第一无线帧的前导类型确定所述第一无线帧在终止接收时刻的终止接收位置；
    根据所述第一无线帧的传输时间和确定的所述终止接收位置，确定所述第一无线帧的所述剩余持续时间。
  4. 根据权利要求3所述的方法，其中，所述根据所述第一无线帧的前导类型确定所述第一无线帧在终止接收时刻的所述终止接收位置包括以下至少之一：
    在所述第一无线帧的前导类型为单用户格式或基于调度的上行格式的情况下，确定所述第一无线帧中的高效率信号域A HE-SIG-A结束的时刻点 为所述终止接收位置；
    在所述第一无线帧的前导类型为扩展范围单用户格式的情况下，确定所述第一无线帧中的重复的高效率信号域A HE-SIG-A结束的时刻点为所述终止接收位置；
    在所述第一无线帧的前导类型为多用户格式的情况下，当通过所述第一无线帧中的高效率信号域A HE-SIG-A确定所述目的接收站点不是所述第一站点时，确定所述第一无线帧中的HE-SIG-A结束的时刻点为所述终止接收位置；
    在所述第一无线帧的前导类型为多用户格式的情况下，当通过所述第一无线帧中的高效率信号域B HE-SIG-B确定所述目的接收站点不是所述第一站点时，确定所述第一无线帧中的HE-SIG-B结束的时刻点为所述终止接收位置。
  5. 根据权利要求1至4中任一项所述的方法，在确定正在接收的所述第一无线帧的所述目的接收站点不是所述第一站点的情况下，终止接收所述第一无线帧之前或之后，所述方法还包括：
    所述第一站点的第一功能实体向所述第一站点的第二功能实体发送接收结束指示，其中，所述接收结束指示用于指示所述第二功能实体更新所述第一站点的NAV或者维持第一站点的NAV不变。
  6. 根据权利要求5所述的方法，其中，所述根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：
    所述第二功能实体根据所述接收结束指示中携带的预定值更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，其中，所述预定值为所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和；或者，
    所述第二功能实体根据所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变。
  7. 根据权利要求6所述的方法，其中，所述第二功能实体根据所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变包括：
    所述第二功能实体计算所述接收结束指示中携带的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和；
    所述第二功能实体根据计算得到的和更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变。
  8. 根据权利要求5至7中任一项所述的方法，其中，
    所述第一功能实体用于执行以下操作至少之一：检测信号强度，在无线信道上收发无线帧，以及为所述第二功能实体提供服务；和/或，
    所述第二功能实体用于执行以下操作至少之一：控制所述第一功能实体对无线信道的接入，接收并解码所述第一功能实体发送的数据单元，发送数据单元给所述第一功能实体并请求服务，进行虚拟载波检测控制。
  9. 根据权利要求1或2或6所述的方法，其中，所述根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：
    判断所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和是否大于所述NAV；
    在判断结果为是的情况下，利用所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间之和更新所述第一站点的所述NAV；
    在判断结果为否的情况下，维持所述第一站点的NAV不变。
  10. 根据权利要求1或2或6所述的方法，其中，所述根据所述第一无线帧的所述剩余持续时间和所述第一无线帧中携带的所述第一传输机会持续时间，更新所述第一站点的所述NAV或者维持所述第一站点的NAV不变，包括：
    使用预定变量保存所述第一传输机会持续时间，以及使用所述第一无线帧的所述剩余持续时间更新无线帧持续时间计时器；
    当所述无线帧持续时间计时器为零时，判断所述预定变量是否大于所述NAV的值；在判断结果为大于的情况下，使用所述预定变量更新所述NAV；在判断结果为小于或等于的情况下，维持所述第一站点的NAV不变；或者，
    当所述无线帧持续时间计时器为零之前，接收第二无线帧；当确定所述第二无线帧的目的接收站点不是所述第一站点时，终止接收所述第二无线帧，判断所述第二无线帧的剩余持续时间和所述第二无线帧中携带的第二传输机会持续时间之和是否大于所述预定变量和所述无线帧持续时间计时器的值之和；在判断结果为大于的情况下，使用所述第二传输机会持续时间更新所述预定变量，并且使用所述第二无线帧的剩余持续时间更新所述无线帧持续时间计时器；在判断结果为小于或等于的情况下，维持所述第一站点的NAV不变。
  11. 根据权利要求1所述的方法，其中，所述根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，包括：
    根据所述第一无线帧的非高吞吐量信号域指示的所述第一无线帧的当前传输持续时间，确定所述第一无线帧的剩余持续时间；
    根据确定的所述第一无线帧的所述剩余持续时间和所述第一传输机会持续时间更新所述第一站点的NAV或者维持所述第一站点的NAV不变。
  12. 一种网络分配矢量NAV的处理装置，包括：
    终止模块，设置为在确定正在接收的第一无线帧的目的接收站点不是第一站点的情况下，终止接收所述第一无线帧；
    处理模块，设置为根据所述第一无线帧的剩余持续时间和所述第一无线帧中携带的第一传输机会持续时间，更新所述第一站点的NAV或者维持所述第一站点的NAV不变，其中，所述第一无线帧的剩余持续时间为在终止接收所述第一无线帧后，用于传输所述第一无线帧剩余部分的传输时间。
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