WO2013155829A1

WO2013155829A1 - Station access method and station

Info

Publication number: WO2013155829A1
Application number: PCT/CN2012/083838
Authority: WO
Inventors: 杨绿溪; 周子铨; 杨讯
Original assignee: 华为技术有限公司
Priority date: 2012-04-16
Filing date: 2012-10-31
Publication date: 2013-10-24
Also published as: CN103379657A; CN103379657B

Abstract

The present invention provides a station access method and a station. The station access method comprises: a station intercepting a channel and demodulating an intercepted frame, to obtain first information in the frame, the first information being used for identifying a basic service set; and if the first information in the frame is the same as first information known to the station, the station competing for the channel according to the value of a transmit opportunity end bit in a physical layer signal field of the frame, to access the channel. The present invention can improve, in an OBSS scenario, the accuracy of determining, by a station, a frame that belongs to a basic service set to which the station belongs, so that the station accurately selects the time of accessing a channel; therefore, it is avoided that data sent by the station conflicts with data of another station in a BSS of the station at an access point and it is also avoided that the station is influenced by another station belonging to a BSS different from that to which the station belongs, thereby improving the success rate of channel access of the station.

Description

Point access method and: 3⁄4 points

Technical field

The present invention relates to communication technologies, and in particular, to a site access method and a site. Background technique

In the prior art, a basic service set (Basic Service Set; BSS) has a wide coverage (for example, a coverage radius of 1 km), and there may be many hidden long sleep sites, and these hidden long sleep sites are at An unsynchronized state where these hidden long sleep sites need to be synchronized when they wake up. Specifically, some information of the Medium Access Control (MAC) layer needs to be moved to a Physical (hereinafter referred to as: PHY) layer to enable these sites to quickly resynchronize. When the station detects the frame, it can synchronize the physical layer signal (Signal; hereinafter referred to as SIG) by demodulating the physical layer without demodulating the MAC layer or the MAC layer is not properly demodulated.

The prior art proposes to introduce a Transmit Opportunity End (hereinafter referred to as: TXOP_END) bit in the Physical Layer Signal (PHY SIG) field to indicate whether the transmission opportunity (Transmit Opportunity; hereinafter referred to as: TXOP) is ended, and then combine The Acknowledge indication (hereinafter referred to as ACK indication) in the PHY SIG field is the correct fallback.

However, in the scenario of overlapping basic service set (Overlap BSS; OBSS for short), if the station only demodulates the PHY layer and reads the preamble information of the PHY layer, the site will make a wrong judgment. The station may be mistaken that the TXOP in the BSS has ended or is mistaken for the new TXOP in the BSS; when the station misunderstands that the TXOP in the BSS has ended, the station starts to access the channel to send data, which When the data sent by the site may conflict with the data of another site in the BSS to which the site belongs, the access point (Access Point; AP); when the site is mistaken, there is a new TXOP in the BSS. At this time, the station will re-listen the channel to the minimum medium synch time to start accessing the channel, so that the station is affected by another station belonging to a different BSS of the station, so that the station access channel The chances are reduced. SUMMARY OF THE INVENTION The present invention provides a site access method and a site to improve the accuracy of a station to determine a frame belonging to a basic service set to which the site belongs in an OBSS scenario.

An aspect of the present invention provides a site access method, including:

The station listens to the channel and demodulates the intercepted frame to obtain first information in the frame, where the first information is used to identify a basic service set;

If the first information in the frame is the same as the first information known by the station, the station competes for the channel according to the value of the transmission end bit in the physical layer signal field of the frame to access The channel.

Another aspect of the present invention provides a site access method, including:

The station parses the received frame to obtain a value of a transmission opportunity end bit in a physical layer signal field of the frame;

Decoding the media access control layer of the frame by the station;

If the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has ended, the station correctly demodulates the medium access control layer, and according to the medium access control layer in the medium access control layer The basic service set identifier determines that the frame belongs to a basic service set to which the station belongs, and the station competes for the channel of the basic service set to access the channel.

Another aspect of the present invention provides a site, including:

a listening module, configured to listen to a channel;

a first demodulation module, configured to demodulate a frame that is detected by the interception module, to obtain first information in the frame, where the first information is used to identify a basic service set;

a first contention module, configured to: when the first information in the frame is the same as the first information known by the station, compete according to a value of a transmission end point in a physical layer signal field of the frame Channel to access the channel.

Another aspect of the present invention provides a site, including:

a parsing module, configured to parse the received frame, and obtain a value of a transmission opportunity end bit in a physical layer signal field of the frame;

a second demodulation module, configured to demodulate a media access control layer of the frame;

a second determining module, configured to: when the value of the transmission opportunity end bit indicates transmission of the frame When the transmission opportunity has ended, and the second demodulation module correctly demodulates the medium access control layer, determining, according to the basic service set identifier of the medium access control header in the medium access control layer, that the frame belongs to The basic service set to which the site belongs;

And a second contention module, configured to: after the second determining module determines that the frame belongs to a basic service set of the station, compete for a channel of the basic service set to access the channel.

The technical effect of one aspect of the present invention is: the station listens to the channel and demodulates the intercepted frame to obtain the first information in the frame; if the first information in the frame is the same as the first information known to the station, The station may determine that the frame belongs to the basic service set of the station, and the station may compete for the channel according to the value of the transmission end bit in the physical layer signal field of the frame to access the channel; thereby implementing the OBSS In the scenario, the station determines the accuracy of the frame that belongs to the basic service set of the site, so that the site can accurately select the time of accessing the channel; and further, the data sent by the site and the data of another site in the BSS to which the site belongs can be avoided. A collision occurs at the access point, and the site is prevented from being affected by another station belonging to a different BSS of the station, and the success rate of the access channel of the station is improved.

The technical effect of another aspect of the present invention is: the station parses the received frame, obtains the value of the transmission opportunity end bit in the physical layer signal field of the frame, and then demodulates the medium access control layer of the frame; if the transmission opportunity ends The value of the bit indicates that the transmission opportunity for transmitting the frame has ended, the station correctly demodulates the medium access control layer, and determines that the frame belongs to the basic service set identifier of the medium access control header in the medium access control layer. If the site belongs to the basic service set, the site competes for the channel of the basic service set to access the channel; thereby, in the OBSS scenario, the accuracy of the frame that determines the frame belonging to the basic service set of the site is improved. The station accurately selects the timing of accessing the channel; thereby preventing the data sent by the station from colliding with the data of another station in the BSS to which the station belongs, and avoiding that the station is subject to a different BSS from the station. The impact of another site increases the success rate of the access channel of the site. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are used in the description of the claims In other words, other drawings can be obtained based on these drawings without paying for creative labor.

1 is a flowchart of an embodiment of a site access method according to the present invention;

2 is a flowchart of another embodiment of a site access method according to the present invention;

3 is a flowchart of still another embodiment of a site access method according to the present invention;

4 is a flowchart of still another embodiment of a site access method according to the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a station according to the present invention; FIG.

6 is a schematic structural view of another embodiment of a station according to the present invention;

Figure 7 is a schematic structural view of still another embodiment of the site of the present invention;

Figure 8 is a flow chart of still another embodiment of the site of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The method provided by the present invention can be used in a wireless local area network to facilitate communication between an AP and a station (Station; hereinafter referred to as STA).

FIG. 1 is a flowchart of an embodiment of a method for accessing a site according to the present invention. As shown in FIG. 1, the method for accessing a site may include:

Step 101: The STA listens to the channel and demodulates the intercepted frame to obtain the first information in the frame, where the first information is used to identify the basic service set.

Step 102: If the first information in the frame is the same as the first information known by the STA, the STA is based on the value of the end of the transmission opportunity (TXOP_END) in the physical layer signal (PHY SIG ) field of the frame. The above channels are contending to access the above channels.

In this embodiment, if the first information in the frame is the same as the first information known by the STA, the STA may determine that the frame belongs to the BSS to which the STA belongs, and the STA may then use the TXOP in the PHY SIG field of the frame. – The value of the END bit competes for the above channel to access the above channel. The first information that is known by the STA is obtained when the STA establishes a connection with the access point AP. Know and record the first information local to the STA.

Specifically, the first information in the frame is carried in the PHY SIG field of the frame. In this embodiment, a random number ( random_number) bit may be added in the PHY SIG field, and the length of the random_number bit may be 2 bits (bit), the value of the random_number bit is the first information in the frame; or the first information in the frame may also be a basic service set identifier in the PHY SIG field (Basic Service Set Identifier; Hereinafter, the partial bits of the BSSID are referred to as BSSIDs. In this case, since the STA knows the BSSID of the BSS when it associates with the AP, the STA can distinguish the BSS and the adjacent BSS by the partial bits of the BSSID.

Specifically, the first information that is known by the STA is that the AP is sent to the STA when the STA is associated with the AP in the BSS, and the first information sent by the AP to each STA in the BSS is the same. Specifically, the AP may carry the foregoing first information in the PHY SIG field of the frame of the STA when the STA is associated with the AP. In this embodiment, a random_number bit may be added in the PHY SIG field, and the length of the random_number bit may be 2 bits, and the value of the random_number bit is the first information; or The first information may also be a partial bit of the BSSID in the PHY SIG field. In this case, since the STA learns the BSSID of the BSS when it associates with the AP, the STA may distinguish the BSS and the adjacent BSS according to the partial bits of the BSSID.

In this embodiment, the manner in which the first information is carried is not limited. As long as the STA is associated with the AP, the frame that the AP sends to the STA may use the same carrying mode as the frame that is detected by the STA.

In this embodiment, the STA may not be the receiving STA of the TXOP that transmits the frame. In the foregoing embodiment, the STA listens to the channel and demodulates the detected frame to obtain the first information in the frame. If the first information in the frame is the same as the first information of the STA, the STA may determine the foregoing. The frame belongs to the BSS to which the STA belongs, so that the STA can compete for the channel according to the value of the TXOP_END bit in the PHY SIG field of the frame to access the channel; thereby, in the OBSS scenario, the STA is determined to belong to the STA. The accuracy of the frame of the basic service set, so that the STA can accurately select the time of accessing the channel; further, it can prevent the data sent by the STA from colliding with the data of another STA in the BSS to which the STA belongs, and avoiding the The STA is affected by another STA that belongs to a different BSS of the STA, and improves the success rate of the STA access channel. 2 is a flowchart of another embodiment of a method for accessing a site according to the present invention. As shown in FIG. 2, the method for accessing the site may include:

Step 201: The STA receives the first information sent by the AP in the BSS to which the STA belongs. In this embodiment, the first information is used to identify the BSS. The first information sent by the AP is generated by the AP. When the STA is associated with the AP, the AP sends the first information to the STA. The first information sent by the AP to each STA in the BSS is the same.

Specifically, the AP may carry the foregoing first information in a PHY SIG field of the frame sent by the AP to the STA when the STA is associated with the AP. In this embodiment, a random_number bit may be added in the PHY SIG field, and the length of the random_number bit may be 2 bits, and the value of the random_number bit is the first information; or The first information may also be a partial bit of the BSSID in the PHY SIG field. In this case, since the STA learns the BSSID of the BSS when it associates with the AP, the STA may distinguish the BSS and the adjacent BSS according to the partial bits of the BSSID.

Further, after receiving the first information, the STA saves the first information. Step 202: The STA listens to the channel and demodulates the intercepted frame to obtain the first information in the frame.

Specifically, when the STA wakes up from the long-sleep state, it first listens to the channel and demodulates the intercepted frame to obtain the first information in the above frame.

Similarly, the first information in the frame is also carried in the PHY SIG field of the frame. In this embodiment, a random_number bit may be added in the PHY SIG field, and the random_number bit may be 2 bits in length ( Bit), the value of the random_number bit is the first information in the frame; or the first information in the frame may also be a partial bit of the BSSID in the PHY SIG field, in this case, because the STA is in When the AP is associated, the BSSID of the BSS is known, so the STA can distinguish the BSS and the adjacent BSS according to the partial bits of the BSSID.

Step 203: The STA determines that the first information in the frame and the first information that is known by the STA are If the same, the STA may determine that the frame belongs to the BSS to which the STA belongs, and then perform step 204; if different, the STA may determine that the frame does not belong to the BSS to which the STA belongs, and then perform step 207.

Step 204: The STA demodulates the MAC layer of the frame to determine whether the STA can correctly demodulate the MAC layer. If the STA can correctly demodulate the MAC layer, perform step 205. If the STA cannot correctly demodulate the MAC layer. Then, step 208 is performed.

Specifically, if the STA can demodulate the MAC layer of the frame to obtain a value of a Cyclic Redundancy Check (CRC) field in the MAC layer, and the value of the CRC field is correct, the STA may determine The STA can correctly demodulate the MAC layer; if the value of the CRC field is incorrect, the STA can determine that the STA cannot correctly demodulate the MAC layer.

In addition, if the STA cannot demodulate the MAC layer of the frame and cannot obtain the value of the CRC field in the MAC layer, it may be determined that the STA cannot correctly demodulate the MAC layer.

Step 205: The STA determines, according to a basic service set identifier (BSS Identifier; BSSID) of the MAC header in the MAC layer, whether the frame belongs to the BSS to which the STA belongs. If yes, step 206 is performed; if it is determined that the frame does not belong to the BSS to which the STA belongs, step 207 is performed.

Step 206: The STA competes for the channel according to the value of the TXOP_END bit in the PHY SIG field of the frame.

Specifically, when the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended, the STA continues to listen to the channel to reach the minimum media synchronization time, and then competes for the channel; or, when the value of the TXOP_END bit is indicated When the TXOP for transmitting the above frame has not ended and there is no Acknowledge (hereinafter referred to as ACK) feedback, the STA waits for the above channel after the end of the frame.

Step 207: The STA ignores the value of the TXOP_END bit in the PHY SIG field of the frame, and continues to listen to the channel.

Step 208, the STA ignores the value of the TXOP_END bit in the PHY SIG field of the frame to compete for the channel.

In this embodiment, the STA may not be the receiving STA of the TXOP that transmits the frame. The foregoing embodiment can be implemented in an OBSS scenario, and the STA is determined to belong to the STA. The accuracy of the frame of the basic service set, so that the STA can accurately select the time of accessing the channel; further, it can prevent the data sent by the STA from colliding with the data of another STA in the BSS to which the STA belongs, and avoiding the The STA is affected by another STA that belongs to a different BSS from the STA, and improves the success rate of the STA access channel.

FIG. 3 is a flowchart of still another embodiment of a method for accessing a site according to the present invention. As shown in FIG. 3, the method for accessing the site may include:

Step 301: The STA parses the received frame to obtain a value of a TXOP END bit in a PHY SIG field of the frame.

Step 302: The STA demodulates the MAC layer of the frame.

Step 303: If the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended, the STA correctly demodulates the MAC layer, and according to the BSSID of the MAC header in the MAC layer, determining that the frame belongs to the BSS to which the STA belongs, The STA competes for the channel of the BSS to access the channel.

In this embodiment, the STA may not be the receiving STA of the TXOP that transmits the frame. In the above embodiment, the STA parses the received frame to obtain the value of the TXOP_END bit in the PHY SIG field of the frame; then the STA needs to continue demodulating the MAC layer of the frame, instead of merely demodulating the PHY layer. Determining; if the value of the TXOP_END bit indicates that the TXOP transmitting the frame has ended, the STA can correctly demodulate the MAC layer, and according to the BSSID of the MAC header in the MAC layer, determining that the frame belongs to the BSS to which the STA belongs, The STA competes for the channel of the BSS to access the channel. Therefore, in the OBSS scenario, the STA can determine the accuracy of the frame that the STA belongs to the BSS to which the STA belongs, so that the STA can accurately select the time of accessing the channel. The data sent by the STA is prevented from colliding with the data of another STA in the BSS to which the STA belongs, and the STA is prevented from being affected by another STA that belongs to the different BSS of the STA, and the success of accessing the channel by the STA is improved. rate.

FIG. 4 is a flowchart of still another embodiment of a method for accessing a site according to the present invention. As shown in FIG. 4, the method for accessing the site may include:

Step 401: The STA parses the received frame to obtain a value of a TXOP END bit in a PHY SIG field of the frame.

Step 402: The STA demodulates the MAC layer of the frame.

Step 403: The STA determines whether the value of the TXOP END bit indicates that the TXOP of the frame is transmitted. If yes, step 404 is performed; if the value of the TXOP_END bit indicates that the TXOP transmitting the above frame has not ended, step 408 is performed.

Specifically, in an implementation manner of this embodiment, when the value of the TXOP_END bit is “0”, it may be determined that the value of the TXOP_END bit indicates that the TXOP transmitting the frame has ended; when the value of the TXOP_END bit When it is "1", it can be determined that the value of the TXOP_END bit indicates that the TXOP transmitting the above frame has not ended.

Step 404: The STA determines whether the STA can correctly demodulate the MAC layer. If the STA can correctly demodulate the MAC layer, step 405 is performed. If the STA cannot correctly demodulate the MAC layer, step 407 is performed.

Specifically, if the STA can demodulate the MAC layer of the foregoing frame, obtain the foregoing MAC layer.

The value of the CRC field, and the value of the CRC field is correct, the STA may determine that the STA can correctly demodulate the MAC layer; if the value of the CRC field is incorrect, the STA may determine that the STA cannot correctly demodulate the MAC layer.

Step 405: The STA determines, according to the BSSID of the MAC header in the MAC layer, whether the frame belongs to the BSS to which the STA belongs. If it is determined that the frame belongs to the BSS to which the STA belongs, step 406 is performed; if it is determined that the frame does not belong to the BSS to which the STA belongs, Then step 407 is performed.

Specifically, if the BSSID of the MAC header is the same as the BSSID of the BSS to which the STA belongs, it may be determined that the frame belongs to the BSS to which the STA belongs; if the BSSID of the MAC header is different from the BSSID of the BSS to which the STA belongs, it may be determined that the frame is not It belongs to the BSS to which the above STA belongs.

Step 406: The STA competes for the channel of the BSS to access the channel.

Step 407, the STA ignores the value of the TXOP_END bit, and waits or enters the sleep state according to the information in the above frame.

Step 408: The STA waits or enters a sleep state according to the information in the above frame.

In this embodiment, the STA may not be the receiving STA of the TXOP that transmits the frame. In the above embodiment, the STA parses the received frame to obtain the value of the TXOP_END bit in the PHY SIG field of the frame. Then, the STA needs to continue demodulating the MAC layer of the frame. However, in this embodiment, when the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended, the STA needs to use the MAC header in the MAC layer of the frame. The BSSID of the part determines whether the frame belongs to the BSS to which the STA belongs, so that in the OBSS scenario, the accuracy of the STA determining the frame belonging to the BSS to which the STA belongs is improved, so that the STA can accurately select the time of accessing the channel; The data sent by the STA conflicts with the data of another STA in the BSS to which the STA belongs, and the STA is prevented from being affected by another STA that belongs to the different BSS of the STA, and the success rate of the STA access channel is improved.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above can be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the above-described method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Embodiments of the present invention also provide apparatus and devices for implementing the above method flow. For example, a station (STA) in a wireless local area network.

FIG. 5 is a schematic structural diagram of an embodiment of a station according to the present invention. The STA 5 in this embodiment may implement the process of the embodiment shown in FIG. 1 of the present invention. As shown in FIG. 5, the STA 5 may include: a listening module 51, The first demodulation module 52 and the first contention module 53;

The listening module 51 is configured to listen to a channel;

The first demodulation module 52 is configured to demodulate the frame that is detected by the intercepting module 51, and obtain the first information in the frame, where the first information is used to identify the BSS;

The first contention module 53 is configured to: when the first information in the frame is the same as the first information known by the STA, compete for the channel according to the value of the TXOP_END bit in the PHY SIG field of the frame, to Enter the above channel.

In this embodiment, if the first information in the frame is the same as the first information known by the STA, it may be determined that the frame belongs to the BSS to which the STA belongs, and then the first contention module 53 may be based on the PHY SIG field of the frame. The value of the TXOP_ END bit competes for the above channel to access the above channel.

Specifically, the first information in the frame is carried in the PHY SIG of the frame. In this embodiment, a first information ( random_number ) bit is added in the PHY SIG field, where The random_number bit may be 2 bits long, and the value of the random_number bit is the first information in the above frame. Alternatively, the first information in the foregoing frame may also be a partial bit of the BSSID in the PHY SIG field. In this case, since the STA knows the BSSID of the BSS when the STA associates with the AP, the STA may distinguish the BSS according to the partial bits of the BSSID. And adjacent BSS.

In the foregoing STA, the listening module 51 listens to the channel, and the first demodulation module 52 demodulates the detected frame to obtain the first information in the frame; if the first information in the frame is known to the STA If the information is the same, it may be determined that the frame belongs to the BSS to which the STA belongs, and the first contention module 53 may compete for the channel according to the value of the TXOP_END bit in the PHY SIG field of the frame to access the channel; In the OBSS scenario, the accuracy of the frame that the STA determines to belong to the basic service set of the STA is improved, so that the STA can accurately select the time of accessing the channel; and further, the data sent by the STA and the other BSS in the STA belong to the STA. The data of the STA collides at the AP, and the STA is prevented from being affected by another STA that belongs to a different BSS of the STA, and the success rate of the STA access channel is improved.

FIG. 6 is a schematic structural diagram of another embodiment of the site of the present invention. The STA 6 in this embodiment can implement the process of the embodiment shown in FIG. 1 and FIG. 2 of the present invention, which is different from the STA 5 shown in FIG. In the STA 6 shown in FIG. 6, the first demodulation module 52 is further configured to demodulate the MAC layer of the frame; the first contention module 53 is specifically configured to be used as the first demodulation module. 52. When the MAC layer can be correctly demodulated, after determining that the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer, the channel is competed according to the value of the TXOP_END bit in the PHY SIG field of the frame.

In this embodiment, the first contention module 53 is further configured to ignore the value of the TXOP_END bit in the PHY SIG field of the frame when the first demodulation module 52 cannot correctly demodulate the MAC, and compete for the channel.

Specifically, if the first demodulation module 52 can demodulate the MAC layer of the frame to obtain the value of the CRC field in the MAC layer, and the value of the CRC field is correct, it can be determined that the first demodulation module 52 can correctly demodulate. The MAC layer; if the value of the CRC field is incorrect, it may be determined that the first demodulation module 52 cannot correctly demodulate the MAC layer.

In addition, if the first demodulation module 52 cannot demodulate the MAC layer of the frame and cannot obtain the value of the CRC field in the MAC layer, it may be determined that the first demodulation module 52 cannot correctly demodulate the MAC layer.

Specifically, the first contention module 53 may compete for the channel after the listening module 51 continues to listen to the channel to reach the minimum media synchronization time when the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended; Alternatively, the first contention module 53 may wait for the channel to end after the end of the frame when the value of the TXOP_END bit indicates that the TXOP transmitting the frame has not ended and no ACK feedback is required.

Further, the above site may further include: a first determining module 54;

The first determining module 54 is configured to: when the first information in the frame is different from the first information of the STA, determine that the frame does not belong to the BSS to which the STA belongs; in this case, the listening module 51 is further used in the first After determining that the frame does not belong to the BSS to which the STA belongs, the determining module 54 ignores the frame and continues to listen to the channel.

The foregoing STA can improve the accuracy of the STA determining the frame belonging to the basic service set of the STA in the OBSS scenario, so that the STA can accurately select the time of accessing the channel; and further, the data sent by the STA and the BSS to which the STA belongs can be avoided. The data of another STA collides at the AP, and the STA is prevented from being affected by another STA that belongs to a different BSS of the STA, and the success rate of the STA access channel is improved.

Figure Ί is a schematic structural diagram of another embodiment of the present invention. The STA 7 in this embodiment can implement the process of the embodiment shown in Figure 3 of the present invention. As shown in Figure 7, the STA 7 can include: The parsing module 71, the second demodulating module 72, the second determining module 73, and the second competing module 74. The parsing module 71 is configured to parse the received frame to obtain the TXOP_END bit in the PHY SIG field of the frame. Value

a second demodulation module 72, configured to demodulate a MAC layer of the frame; specifically, if the second demodulation module 72 can demodulate a MAC layer of the frame, obtain a value of a CRC field in the MAC layer, and the CRC field If the value is correct, it can be determined that the second demodulation module 72 can correctly demodulate the MAC layer; if the value of the CRC field is incorrect, it can be determined that the second demodulation module 72 cannot correctly demodulate the MAC layer; The second demodulation module 72 may not demodulate the MAC layer of the frame, and may not obtain the value of the CRC field in the MAC layer, and may also determine that the second demodulation module 72 cannot correctly demodulate the MAC layer.

a second determining module 73, configured to: when the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended, and the second demodulation module 72 correctly demodulates the MAC layer, according to the BSSID of the MAC header in the MAC layer Determining that the frame belongs to the BSS to which the STA belongs; specifically, if the BSSID of the MAC header is the same as the BSSID of the BSS to which the STA belongs, it may be determined that the frame belongs to the BSS to which the STA belongs;

The second contention module 74 is configured to: after the second determining module 73 determines that the frame belongs to the BSS to which the STA belongs, compete for the channel of the BSS to access the channel.

In the above STA, the parsing module 71 parses the received frame to obtain the value of the TXOP_END bit in the PHY SIG field of the frame; then, the second demodulation module 72 continues to demodulate the MAC layer of the frame, but not only the solution. The PHY layer is determined; when the value of the TXOP_END bit indicates that the TXOP transmitting the frame has ended, if the second demodulation module 72 can correctly demodulate the MAC layer, and the second determining module 73 is based on the MAC The BSSID of the MAC header in the layer determines that the frame belongs to the BSS to which the STA belongs, and the second contention module 74 competes for the channel of the BSS to access the channel; thereby, in the OBSS scenario, the STA is determined to belong to the STA. The accuracy of the frame of the BSS to which the STA is located, so that the STA can accurately select the time of accessing the channel; and further, the data sent by the STA and the data of another STA in the BSS to which the STA belongs can be prevented from colliding with the AP, and the STA is prevented from being subjected to the STA. The effect of the STA accessing the channel is improved by the influence of another STA of the STA belonging to a different BSS.

FIG. 8 is a flowchart of still another embodiment of the site of the present invention. The STA 8 in this embodiment can implement the process of the embodiment shown in FIG. 3 or FIG. 4 of the present invention, compared with the STA 7 shown in FIG. The STA 8 shown in FIG. 8 may further include: a first processing module 75, a second processing module 76, and a third processing module 77;

In this embodiment, the second determining module 73 is further configured to: when the second demodulation module 72 can correctly demodulate the MAC layer, determine, according to the BSSID of the MAC header in the MAC layer, that the frame does not belong to the BSS to which the STA belongs; Specifically, if the BSSID of the MAC header is different from the BSSID of the BSS to which the STA belongs, it may be determined that the frame does not belong to the BSS to which the STA belongs.

The first processing module 75 is configured to: after the second determining module 73 determines that the frame does not belong to the BSS to which the STA belongs, ignore the value of the TXOP_END bit, and wait or enter a sleep state according to the information in the frame.

The second processing module 76 is configured to ignore the value of the end opportunity of the transmission opportunity when the second demodulation module 72 cannot correctly demodulate the MAC layer, and wait or enter a sleep state according to the information in the frame.

The third processing module 77 is configured to wait or enter a sleep state according to the information in the frame when the value of the TXOP_END bit indicates that the TXOP transmitting the frame has not ended.

In the above STA, the parsing module 71 parses the received frame to obtain the value of the TXOP_END bit in the PHY SIG field of the frame. Then, the second demodulation module 72 needs to continue demodulating the MAC layer of the frame, but not only the solution. The PHY layer is determined. In this embodiment, when the value of the TXOP_END bit indicates that the TXOP for transmitting the frame has ended, the STA needs to determine the BSSID of the MAC header in the MAC layer of the frame. Whether the frame belongs to the BSS to which the STA belongs, so that the accuracy of the STA determining the frame belonging to the BSS to which the STA belongs is improved in the OBSS scenario, so that the STA can accurately select the time of accessing the channel; The data of another STA in the BSS to which the STA belongs is collided at the AP, and the STA is prevented from being affected by another STA that belongs to a different BSS of the STA, and the success rate of accessing the channel by the STA is improved.

Those skilled in the art will appreciate that the drawings are only schematic representations of a preferred embodiment, in which The modules or processes are not necessarily required to practice the invention.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment description, or the corresponding changes may be located in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

Claim

A site access method, characterized in that it comprises:

The method according to claim 1, wherein the station further comprises: the station demodulation station according to the value of the transmission opportunity end bit in the physical layer signal field of the frame before the content is competed for the channel a medium access control layer of the frame;

The station competes according to the value of the transmission opportunity end bit in the physical layer signal field of the frame. The channel includes:

If the station is capable of correctly demodulating the medium access control layer, determining, according to the basic service set identifier of the medium access control header in the medium access control layer, that the frame belongs to the basic service set of the station And the station competes for the channel according to a value of a transmission end bit in a physical layer signal field of the frame.

The method according to claim 1 or 2, wherein the station competes for the channel according to a value of a transmission end bit in a physical layer signal field of the frame, including:

When the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has ended, the station continues to listen to the channel after reaching the minimum media synchronization time, and competes for the channel; or

When the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has not ended and no acknowledgment feedback is required, the station waits for the channel to compete for the channel after the end of the frame.

The method according to claim 2, after the demodulating the media access control layer of the frame, the station further includes:

If the station is unable to properly demodulate the medium access control layer, the station ignores the value of the transmission opportunity end bit in the physical layer signal field of the frame, competing for the channel.

The method according to claim 1 or 2, further comprising: if the first information in the frame is different from the first information known by the station, the station determines that the frame is not A basic service set belonging to the site, the site ignoring the object of the frame The value of the transmission end bit in the layer signal field continues to listen to the channel.

6. A method according to claim 1 or 2, characterized in that

The first information in the frame is carried in a physical layer signal field of the frame;

The first information that is known by the site is that when the site is associated with an access point in the basic service set, the access point is sent to the site, and the access point is sent to the basic service set. The first information for each site is the same.

7. A site access method, comprising:

Decoding the media access control layer of the frame by the station;

The method according to claim 7, wherein after the demodulating the media access control layer of the frame, the station further includes:

If the station is capable of correctly demodulating the medium access control layer, and determining, according to the basic service set identifier of the medium access control header in the medium access control layer, that the frame does not belong to the basic service set to which the station belongs And the station ignores the value of the end of the transmission opportunity, and waits or enters a sleep state according to the information in the frame.

The method according to claim 7, wherein after the station demodulates the medium access control layer of the frame, the method further includes:

If the station is unable to properly demodulate the medium access control layer, the station ignores the value of the transmission opportunity end bit and waits or enters a sleep state according to the information in the frame.

The method according to claim 7, wherein after the obtaining the value of the transmission end bit in the physical layer signal field of the frame, the station demodulates the medium access control layer of the frame. , Also includes:

When the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has not ended, the station waits or enters a sleep state according to information in the frame.

1 1. A site, characterized in that it comprises: a listening module, configured to listen to a channel;

12. The station of claim 11 wherein:

The first demodulation module is further configured to demodulate a media access control layer of the frame;

The first contention module is specifically configured to: when the first demodulation module is capable of correctly demodulating the media access control layer, according to a basic medium of the media access control layer in the media access control layer After the service set identifier determines that the frame belongs to the basic service set to which the station belongs, the channel is competed according to the value of the transmission opportunity end bit in the physical layer signal field of the frame.

13. A station according to claim 11 or 12, characterized in that

The first contention module is specifically configured to: when the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has ended, after the listening module continues to listen to the channel to reach a minimum media synchronization time Competing for the channel; or,

The first contention module is specifically configured to: when the value of the transmission opportunity end bit indicates that the transmission opportunity of the transmission frame has not ended and does not require acknowledgement feedback, wait for the channel to compete after the end of the frame.

14. The station of claim 12, wherein:

The first contention module is further configured to: when the first demodulation module fails to correctly demodulate the media access control layer, ignore the value of the end of the transmission opportunity in the physical layer signal field of the frame, Compete for the channel.

The station according to claim 11 or 12, further comprising: a first determining module;

The first determining module is configured to: when the first information in the frame is different from the first information known by the station, determine that the frame does not belong to a basic service set to which the site belongs;

The listening module is further configured to: after the first determining module determines that the frame does not belong to the basic service set of the station, ignore the value of the end of the transmission opportunity in the physical layer signal field of the frame, and continue to detect Listen to the channel.

16. A site, characterized by comprising:

a second determining module, configured to: when a value of the transmission opportunity end bit indicates that a transmission opportunity for transmitting the frame has ended, and the second demodulation module correctly demodulates the medium access control layer, according to the The basic service set identifier of the media access control header in the media access control layer determines that the frame belongs to a basic service set to which the site belongs;

The station according to claim 16, further comprising: a first processing module;

The second determining module is further configured to: when the second demodulation module is capable of correctly demodulating the media access control layer, according to a basic service set of a media access control header in the media access control layer The identifier determines that the frame does not belong to a basic service set to which the site belongs;

The first processing module is configured to: after the second determining module determines that the frame does not belong to the basic service set to which the station belongs, ignore the value of the end of the transmission opportunity, wait for or according to information in the frame Go to sleep.

The station according to claim 16, further comprising:

a second processing module, configured to: when the second demodulation module fails to correctly demodulate the media access control layer, ignore a value of the end of the transmission opportunity, and wait or enter a sleep state according to information in the frame .

The site according to claim 16, further comprising:

And a third processing module, configured to wait or enter a sleep state according to the information in the frame when the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has not ended.