CN103379657B - Website cut-in method and website - Google Patents

Website cut-in method and website Download PDF

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Publication number
CN103379657B
CN103379657B CN201210110905.5A CN201210110905A CN103379657B CN 103379657 B CN103379657 B CN 103379657B CN 201210110905 A CN201210110905 A CN 201210110905A CN 103379657 B CN103379657 B CN 103379657B
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China
Prior art keywords
frame
station
channel
transmission opportunity
value
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CN201210110905.5A
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Chinese (zh)
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CN103379657A (en
Inventor
杨绿溪
周子铨
杨讯
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Global Innovation Polymerization LLC
Gw Partnership Co ltd
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Huawei Technologies Co Ltd
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Priority to CN201210110905.5A priority Critical patent/CN103379657B/en
Priority to PCT/CN2012/083838 priority patent/WO2013155829A1/en
Publication of CN103379657A publication Critical patent/CN103379657A/en
Application granted granted Critical
Publication of CN103379657B publication Critical patent/CN103379657B/en
Expired - Fee Related legal-status Critical Current
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a kind of website cut-in method and website, and described website cut-in method includes: the frame that website intercepts channel and demodulation listens to, it is thus achieved that the first information in described frame, the described first information is used for identifying Basic Service Set；If the first information known to the first information in described frame and described website is identical, the most described website competes described channel, to access described channel according to the value of transmission opportunity stop bits in the physical layer signal field of described frame.The present invention can be implemented under OBSS scene, improves website and judges to belong to the accuracy of the frame of Basic Service Set belonging to this website, makes this website accurately select to access the opportunity of channel；And then the data of another website in BSS belonging to data that this website sends and this website can be avoided to clash at access point, and avoid this website to be affected by another website belonging to different BSS from this website, improve this website and access the success rate of channel.

Description

Site access method and site
Technical Field
The present invention relates to communications technologies, and in particular, to a station access method and a station.
Background
In the prior art, a coverage range of a Basic Service Set (BSS) is relatively wide (for example, the coverage radius is 1 km), there may be many hidden long sleep stations, and the hidden long sleep stations are in an unsynchronized state, and synchronization needs to be performed when the hidden long sleep stations wake up. In particular, some information of a Media Access Control (MAC) layer needs to be moved into a Physical (PHY) layer to enable fast resynchronization of the stations. Therefore, when the station listens to the frame, when only the physical layer is demodulated and the MAC layer is not demodulated or the MAC layer is not demodulated correctly, the station can carry out synchronization through Signal (SIG) information of the physical layer.
The prior art proposes to introduce a Transmit Opportunity End (TXOP _ End) bit in a physical layer signal (PHY SIG) field to indicate whether a Transmit Opportunity (TXOP) is ended, and then to combine an acknowledgement (ack indication) bit in the PHY SIG field to make a correct backoff.
However, in a scenario of an overlapping basic service set (overlay BSS; hereinafter abbreviated as OBSS), if a station only demodulates a PHY layer and reads preamble information of the PHY layer, the station may make an erroneous determination that the station may mistakenly think that a TXOP in the BSS has ended or mistakenly think that there is a new TXOP in the BSS; when the station mistakenly thinks that the TXOP in the BSS has ended, the station starts to access the channel to send data, and at this time, the data sent by the station may collide with the data of another station in the BSS to which the station belongs at an Access Point (AP); when the station mistakenly thinks that there is a new TXOP in the BSS, the station will re-listen to the channel for a minimum media synchronization time (minimum synchronization time) to start accessing the channel, so that the station will be affected by another station belonging to a different BSS from the station, and the chance of accessing the channel by the station is reduced.
Disclosure of Invention
The invention provides a site access method and a site, which are used for improving the accuracy of judging a frame belonging to a basic service set of the site by the site in an OBSS scene.
One aspect of the present invention provides a station access method, including:
a station monitors a channel and demodulates the monitored frame to obtain first information in the frame, wherein the first information is used for identifying a basic service set;
and if the first information in the frame is the same as the first information known by the station, the station contends for the channel according to the value of the transmission opportunity ending bit in the physical layer signal field of the frame so as to access the channel.
Another aspect of the present invention provides a station access method, including:
the station analyzes the received frame and obtains the value of the transmission opportunity ending bit in the physical layer signal field of the frame;
the station demodulates a media access control layer of the frame;
and if the value of the transmission opportunity ending 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 to which the station belongs according to the basic service set identification of a medium access control head in the medium access control layer, and the station contends for a channel of the basic service set to access the channel.
Yet another aspect of the present invention provides a station comprising:
the monitoring module is used for monitoring a channel;
the first demodulation module is used for demodulating the frames sensed by the sensing module to obtain first information in the frames, wherein the first information is used for identifying a basic service set;
a first contention module, configured to contend for the channel according to a value of a transmission opportunity end bit in a physical layer signal field of the frame to access the channel when the first information in the frame is the same as the first information known by the station.
Yet another aspect of the present invention provides a station comprising:
the analysis module is used for analyzing the received frame to obtain the value of the transmission opportunity ending bit in the physical layer signal field of the frame;
the second demodulation module is used for demodulating the media access control layer of the frame;
a second determining module, configured to determine, according to a basic service set identifier of a media access control header in the media access control layer, that the frame belongs to a basic service set to which the station belongs when the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has ended and the second demodulating module correctly demodulates the media access control layer;
a second competition module, configured to, after the second determining module determines that the frame belongs to the basic service set to which the station belongs, compete for a channel of the basic service set to access the channel.
The technical effects of the invention on one hand are as follows: the method comprises the steps that a station monitors a channel and demodulates a monitored frame to obtain first information in the frame; if the first information in the frame is the same as the first information known by the station, the station may determine that the frame belongs to the basic service set to which the station belongs, and then the station may contend for the channel according to a value of a transmission opportunity end bit in a physical layer signal field of the frame to access the channel; therefore, the accuracy of judging the frame belonging to the basic service set of the site by the site can be improved under the OBSS scene, so that the site can accurately select the time for accessing the channel; and then, the data sent by the station and the data of another station in the BSS to which the station belongs can be prevented from colliding at the access point, the station is prevented from being influenced by another station which belongs to a different BSS from the station, and the success rate of the station for accessing the channel is improved.
The technical effects of the other aspect of the invention are as follows: the station analyzes the received frame, obtains the value of the transmission opportunity ending bit in the physical layer signal field of the frame, and then demodulates the media access control layer of the frame; if the value of the transmission opportunity ending 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 of the station according to the basic service set identification of a medium access control head in the medium access control layer, the station competes for a channel of the basic service set to access the channel; therefore, the accuracy of judging the frame belonging to the basic service set of the site by the site can be improved under the OBSS scene, so that the site can accurately select the time for accessing the channel; and then, the data sent by the station and the data of another station in the BSS to which the station belongs can be prevented from colliding at the access point, the station is prevented from being influenced by another station which belongs to a different BSS from the station, and the success rate of the station for accessing the channel is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of a station access method according to the present invention;
fig. 2 is a flowchart of another embodiment of the station access method of the present invention;
fig. 3 is a flowchart of a station access method according to still another embodiment of the present invention;
fig. 4 is a flowchart of a station access method according to still another embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a station of the present invention;
FIG. 6 is a schematic structural diagram of another embodiment of a station of the present invention;
fig. 7 is a schematic structural diagram of a further embodiment of a station according to the invention;
fig. 8 is a flow chart of yet another embodiment of the station of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method provided by the invention can be used in a wireless local area network to assist in realizing the communication between the AP and a Station (Station; hereinafter referred to as STA).
Fig. 1 is a flowchart of an embodiment of a station access method according to the present invention, and as shown in fig. 1, the station access method may include:
step 101, the STA listens to the channel and demodulates the listened 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 contends for the channel according to a value of a transmission opportunity END (TXOP _ END) bit in a physical layer signal (PHY SIG) field of the frame to access the channel.
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 then the STA may contend for the channel according to the value of the TXOP _ END bit in the PHY SIG field of the frame to access the channel. The first information known by the STA is the first information which is known and recorded locally at the STA when the STA establishes connection with the access point AP.
Specifically, the first information in the frame is carried in a PHY SIG field of the frame; in this embodiment, a random _ number bit may be newly added to the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and 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 a Basic Service Set Identifier (BSSID) in the PHY SIG field, in this case, since the STA learns the BSSID of the BSS when associating with the AP, the STA may distinguish the BSS from an adjacent BSS according to the partial bit of the BSSID.
Specifically, when the first information known by the STA is that the STA associates with an AP in the BSS, the AP sends the first information to the STA; wherein, the first information sent by the AP to each STA in the BSS is the same. Specifically, the AP may carry the first information in a PHY SIG field of a frame that the AP transmits to the STA when the STA associates with the AP. In this embodiment, a random _ number bit may be newly added in the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and the value of the random _ number bit is the first information; alternatively, the first information may be partial bits of the BSSID in the PHY SIG field, and in this case, since the STA learns the BSSID of the own BSS when associating with the AP, the STA may distinguish the own BSS from the adjacent BSS according to the partial bits of the BSSID.
In this embodiment, the carrying manner of the first information is not limited, as long as the same carrying manner is adopted in the frame sent by the AP to the STA when the STA associates with the AP as that in the frame intercepted by the STA.
In this embodiment, the STA may not be a receiver STA that transmits the TXOP of the frame.
In the above embodiment, the STA listens to the channel and demodulates the listened 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 that the frame belongs to the BSS to which the STA belongs, and then the STA may contend for the channel according to the value of the TXOP _ END bit in the PHY SIG field of the frame to access the channel; therefore, the accuracy of the STA in judging the frames belonging to the basic service set of the STA can be improved in an OBSS scene, so that the STA can accurately select the time for 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 at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA in accessing the channel is improved.
Fig. 2 is a flowchart of another embodiment of a station access method according to the present invention, and as shown in fig. 2, the station access method may include:
in step 201, the STA receives first information sent by an AP in a BSS to which the STA belongs.
In this embodiment, the first information is used to identify a BSS. The first information transmitted by the AP is generated by the AP, and the AP transmits the first information to the STA when the STA associates with the AP. Wherein, the first information sent by the AP to each STA in the BSS is the same.
Specifically, the AP may carry the first information in a PHY SIG field of a frame that the AP transmits to the STA when the STA associates with the AP. In this embodiment, a random _ number bit may be newly added in the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and the value of the random _ number bit is the first information; alternatively, the first information may be a partial bit of the BSSID in the PHYSIG field, and in this case, since the STA learns the BSSID of the own BSS when associating with the AP, the STA can distinguish the own BSS from the adjacent BSS according to the partial bit 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 listened frame to obtain the first information in the frame.
Specifically, when the STA wakes up from a long sleep state, it will listen to the channel first and demodulate the listened frame to obtain the first information in the 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 newly added in the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and the value of the random _ number bit is the first information in the frame; alternatively, the first information in the frame may be a partial bit of the BSSID in the PHY SIG field, in which case, since the STA learns the BSSID of the own BSS when associating with the AP, the STA may distinguish the own BSS from the adjacent BSS according to the partial bit of the BSSID.
In this embodiment, the carrying manner of the first information is not limited, as long as the same carrying manner is adopted in the frame sent by the AP to the STA when the STA associates with the AP as that in the frame intercepted by the STA.
Step 203, the STA determines whether the first information in the frame is the same as the first information known by the STA; if the frames are the same, the STA may determine that the frame belongs to the BSS to which the STA belongs, and then perform step 204; if not, 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, and determines whether the STA can correctly demodulate the MAC layer; if the STA can correctly demodulate the MAC layer, go to step 205; if the STA cannot demodulate the MAC layer correctly, 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 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 demodulate the MAC layer correctly.
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.
In step 205, the STA determines whether the frame belongs to the BSS to which the STA belongs according to a Basic Service Set Identifier (BSSID) of the MAC header in the MAC layer. If so, go to step 206; if it is determined that the frame does not belong to the BSS to which the STA belongs, step 207 is performed.
In step 206, the STA contends 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 for the minimum medium synchronization time and then contends for the channel; or, when the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has not ended and does not require Acknowledgement (ACK) feedback, the STA waits for the channel to contend after the END of the frame.
In 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.
In step 208, the STA ignores the value of the TXOP _ END bit in the PHY SIG field of the frame and contends for the channel.
In this embodiment, the STA may not be a receiver STA that transmits the TXOP of the frame.
The embodiment can improve the accuracy of the STA in judging the frame belonging to the basic service set of the STA under the OBSS scene, so that the STA can accurately select the time for 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 at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA in accessing the channel is improved.
Fig. 3 is a flowchart of a station access method according to still another embodiment of the present invention, and as shown in fig. 3, the station access method may include:
step 301, the STA parses the received frame to obtain the value of the TXOP _ END bit in the 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 to transmit the frame has ended, the STA demodulates the MAC layer correctly, and determines that the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer, and then the STA contends for the channel of the BSS to access the channel.
In this embodiment, the STA may not be a receiver STA that transmits the TXOP of 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, but cannot make a decision by only demodulating the PHY layer; if the value of the TXOP _ END bit indicates that the TXOP for transmitting the frame is finished, the STA can correctly demodulate the MAC layer, and the STA determines that the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC head in the MAC layer, and then the STA contends for the channel of the BSS to access the channel; therefore, the accuracy of the STA in judging the frame belonging to the BSS of the STA can be improved in an OBSS scene, and the STA can accurately select the time for accessing the channel; therefore, the data sent by the STA and the data of another STA in the BSS the STA belongs to can be prevented from colliding at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA accessing the channel is improved.
Fig. 4 is a flowchart of a station access method according to still another embodiment of the present invention, and as shown in fig. 4, the station access method may include:
in step 401, the STA parses the received frame to obtain the value of the TXOP _ END bit in the PHY SIG field of the frame.
In 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 to transmit the frame has ended; if so, go to step 404; if the value of the TXOP _ END bit indicates that the TXOP to transmit the 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 is "1," it may be determined that the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has not ended.
Step 404, the STA judges whether the STA can demodulate the MAC layer correctly; if the STA can correctly demodulate the MAC layer, go to step 405; if the STA cannot demodulate the MAC layer correctly, step 407 is performed.
Specifically, if the STA can demodulate the MAC layer of the frame, obtain the value of the CRC field in the MAC layer, 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 demodulate the MAC layer correctly.
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 405, the STA determines whether the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer; if the frame is determined to belong to the BSS to which the STA belongs, go to step 406; if it is determined that the frame does not belong to the BSS to which the STA belongs, 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 does not belong to the BSS to which the STA belongs.
In step 406, the STA contends for the channel of the BSS to access the channel.
In step 407, the STA ignores the value of the TXOP _ END bit, and waits or enters a sleep state according to the information in the frame.
In step 408, the STA waits or goes to sleep according to the information in the above frame.
In this embodiment, the STA may not be a receiver STA that transmits the TXOP of 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, but cannot make a decision by demodulating only the PHY layer; that is to say, in this embodiment, when the value of the TXOP _ END bit indicates that the TXOP for transmitting the frame is completed, the STA needs to determine whether the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer of the frame, so that in an OBSS scene, the accuracy of determining, by the STA, the frame belonging to the BSS to which the STA belongs can be improved, and the STA can accurately select the time for accessing the channel; therefore, the data sent by the STA and the data of another STA in the BSS the STA belongs to can be prevented from colliding at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA accessing the channel is improved.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The embodiment of the invention also provides device equipment for realizing the method flow. Such as a Station (STA) in a wireless local area network.
Fig. 5 is a schematic structural diagram of an embodiment of a station of the present invention, where an STA in this embodiment may implement the flow of the embodiment shown in fig. 1 of the present invention, as shown in fig. 5, the STA may include: a listening module 51, a first demodulation module 52 and a first contention module 53;
the listening module 51 is configured to listen to a channel;
a first demodulation module 52, configured to demodulate the frame sensed by the sensing module 51 to obtain first information in the frame, where the first information is used to identify a BSS;
a first contention module 53, configured to contend for the channel according to a value of the TXOP _ END bit in the PHY SIG field of the frame to access the channel when the first information in the frame is the same as the first information known by the STA.
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 contend for the channel according to the value of the TXOP _ END bit in the PHY SIG field of the frame, so as to access the 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 newly added in the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and a value of the random _ number bit is the first information in the frame. Alternatively, the first information in the frame may be a partial bit of the BSSID in the PHY SIG field, in which case, since the STA learns the BSSID of the own BSS when associating with the AP, the STA may distinguish the own BSS from the adjacent BSS according to the partial bit of the BSSID.
Specifically, when the first information known by the STA is that the STA associates with an AP in the BSS, the AP sends the first information to the STA; wherein, the first information sent by the AP to each STA in the BSS is the same. Specifically, the AP may carry the first information in a PHY SIG field of a frame that the AP transmits to the STA when the STA associates with the AP. In this embodiment, a random _ number bit may be newly added in the PHY SIG field, where the length of the random _ number bit may be 2 bits (bit), and the value of the random _ number bit is the first information; alternatively, the first information may be partial bits of the BSSID in the PHY SIG field, and in this case, since the STA learns the BSSID of the own BSS when associating with the AP, the STA may distinguish the own BSS from the adjacent BSS according to the partial bits of the BSSID.
In this embodiment, the carrying manner of the first information is not limited, as long as the same carrying manner is adopted in the frame sent by the AP to the STA when the STA associates with the AP as that in the frame intercepted by the STA.
In the STA, an interception module 51 intercepts a channel, and a first demodulation module 52 demodulates an intercepted frame to obtain first information in the frame; 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 contend for the channel according to the value of the TXOP _ END bit in the PHY SIG field of the frame to access the channel; therefore, the accuracy of the STA in judging the frames belonging to the basic service set of the STA can be improved in an OBSS scene, so that the STA can accurately select the time for 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 at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA in accessing the channel is improved.
Fig. 6 is a schematic structural diagram of another embodiment of a station of the present invention, where an STA in this embodiment may implement the flows of the embodiments shown in fig. 1 and fig. 2 of the present invention, and compared with the STA shown in fig. 5, the difference is that, in the STA shown in fig. 6, further, the first demodulation module 52 is further configured to demodulate the MAC layer of the frame; the first contending module 53 is specifically configured to, when the first demodulating module 52 can correctly demodulate the MAC layer, contend for the channel according to the value of the TXOP _ END bit in the PHY SIG field of the frame 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.
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 and contend for the channel when the first demodulation module 52 cannot correctly demodulate the MAC.
Specifically, if the first demodulation module 52 can demodulate the MAC layer of the frame, 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 can 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 also be determined that the first demodulation module 52 cannot correctly demodulate the MAC layer.
Specifically, the first contention module 53 may contend for the channel after the listening module 51 continues to listen to the channel for the minimum medium synchronization time when the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has ended; alternatively, the first contention module 53 may wait for contention for the channel after the END of the frame when the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has not ended and does not require ACK feedback.
Further, the station may further include: a first determination module 54;
a first determining module 54, configured to determine that the frame does not belong to the BSS to which the STA belongs when the first information in the frame is different from the first information of the STA; in this case, the listening module 51 is further configured to ignore the frame and continue listening to the channel after the first determining module 54 determines that the frame does not belong to the BSS to which the STA belongs.
The STA can improve the accuracy of judging the frame belonging to the basic service set of the STA by the STA under an OBSS scene, so that the STA can accurately select the opportunity of accessing a 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 at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA in accessing the channel is improved.
Fig. 7 is a schematic structural diagram of a station according to still another embodiment of the present invention, where an STA in this embodiment may implement the flow of the embodiment shown in fig. 3 of the present invention, as shown in fig. 7, the STA may include: a parsing module 71, a second demodulation module 72, a second determination module 73 and a second competition module 74;
the parsing module 71 is configured to parse a received frame to obtain a value of a TXOP _ END bit in a PHY SIG field of the frame;
a second demodulation module 72, configured to demodulate the MAC layer of the frame; specifically, if the second demodulation module 72 can demodulate the MAC layer of the frame, 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 second demodulation module 72 can correctly demodulate the MAC layer; if the value of the CRC field is incorrect, it may be determined that the second demodulation module 72 cannot correctly demodulate the MAC layer; in addition, if the second demodulation module 72 cannot demodulate the MAC layer of the frame and cannot obtain the value of the CRC field in the MAC layer, it may also be determined that the second demodulation module 72 cannot correctly demodulate the MAC layer;
a second determining module 73, configured to determine, according to the BSSID of the MAC header in the MAC layer, that the frame belongs to the BSS to which the STA belongs when the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has ended and the second demodulating module 72 correctly demodulates the MAC layer; 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;
a second competition module 74, configured to, after the second determining module 73 determines that the frame belongs to the BSS to which the STA belongs, compete for a channel of the BSS to access the channel.
In the 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 above frame, and cannot only demodulate the PHY layer to make a determination; when the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has ended, if the second demodulation module 72 can correctly demodulate the MAC layer and the second determination module 73 determines 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 second contention module 74 contends for the channel of the BSS to access the channel; therefore, the accuracy of the STA in judging the frame belonging to the BSS of the STA can be improved in an OBSS scene, and the STA can accurately select the time for accessing the channel; therefore, the data sent by the STA and the data of another STA in the BSS the STA belongs to can be prevented from colliding at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA accessing the channel is improved.
Fig. 8 is a flowchart of a further embodiment of a station of the present invention, where an STA in this embodiment may implement the flowchart of the embodiment shown in fig. 3 or fig. 4 of the present invention, and compared with the STA shown in fig. 7, the difference is that the STA 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 determine, when the second demodulating module 72 can correctly demodulate the MAC layer, that the frame does not belong to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer; 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 ignore the value of the TXOP _ END bit and wait or enter a sleep state according to the information in the frame after the second determining module 73 determines that the frame does not belong to the BSS to which the STA belongs.
A second processing module 76, configured to ignore the value of the transmission opportunity end bit and wait or enter a sleep state according to the information in the frame when the second demodulation module 72 cannot correctly demodulate the MAC layer.
A third processing module 77, 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.
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 is "1," it may be determined that the value of the TXOP _ END bit indicates that the TXOP to transmit the frame has not ended.
In the 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 cannot make a determination by demodulating only the PHY layer; that is to say, in this embodiment, when the value of the TXOP _ END bit indicates that the TXOP for transmitting the frame is completed, the STA needs to determine whether the frame belongs to the BSS to which the STA belongs according to the BSSID of the MAC header in the MAC layer of the frame, so that in an OBSS scene, the accuracy of determining, by the STA, the frame belonging to the BSS to which the STA belongs can be improved, and the STA can accurately select the time for accessing the channel; therefore, the data sent by the STA and the data of another STA in the BSS the STA belongs to can be prevented from colliding at the AP, the STA is prevented from being influenced by another STA which belongs to a different BSS from the STA, and the success rate of the STA accessing the channel is improved.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (19)

1. A station access method, comprising:
a station monitors a channel and demodulates the monitored frame to obtain first information in the frame, wherein the first information is used for identifying a basic service set;
and if the first information in the frame is the same as the first information known by the station, the station contends for the channel according to the value of the transmission opportunity ending bit in the physical layer signal field of the frame so as to access the channel.
2. The method of claim 1, wherein the station contends for the channel before according to the value of the transmission opportunity end bit in the physical layer signal field of the frame, further comprising:
the station demodulates a media access control layer of the frame;
the station contends for the channel according to the value of the transmission opportunity ending bit in the physical layer signal field of the frame includes:
if the station can correctly demodulate the media access control layer, after determining that the frame belongs to the basic service set of the station according to the basic service set identification of the media access control head in the media access control layer, the station competes for the channel according to the value of the transmission opportunity ending bit in the physical layer signal field of the frame.
3. The method of claim 1 or 2, wherein the station contending for the channel according to the value of the transmission opportunity end bit in the physical layer signal field of the frame comprises:
when the value of the transmission opportunity ending bit indicates that the transmission opportunity for transmitting the frame is ended, the station continuously monitors the channel for a minimum media synchronization time and then competes for the channel; or,
and when the value of the transmission opportunity ending bit indicates that the transmission opportunity for transmitting the frame is not ended and no acknowledgement feedback is required, the station waits for the channel after the frame is ended.
4. The method of claim 2, wherein after demodulating the media access control layer of the frame, the station further comprises:
and if the station cannot correctly demodulate the media access control layer, the station ignores the value of the transmission opportunity ending bit in the physical layer signal field of the frame and competes for the channel.
5. The method of claim 1 or 2, further comprising:
and if the first information in the frame is different from the first information known by the station, the station determines that the frame does not belong to the basic service set to which the station belongs, ignores the value of a transmission opportunity ending bit in a physical layer signal field of the frame, and continues to listen to the channel.
6. The method according to claim 1 or 2,
first information in the frame is carried in a physical layer signal field of the frame;
the first information known by the station is that when the station is associated with an access point in the basic service set, the first information sent by the access point to the station is the same.
7. A station access method, comprising:
the station analyzes the received frame and obtains the value of the transmission opportunity ending bit in the physical layer signal field of the frame;
the station demodulates a media access control layer of the frame;
and if the value of the transmission opportunity ending 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 to which the station belongs according to the basic service set identification of a medium access control head in the medium access control layer, and the station contends for a channel of the basic service set to access the channel.
8. The method of claim 7, wherein after demodulating the media access control layer of the frame, the station further comprises:
and if the station can correctly demodulate the media access control layer and determines that the frame does not belong to the basic service set of the station according to the basic service set identification of the media access control head in the media access control layer, the station ignores the value of the transmission opportunity ending bit and waits or enters a sleep state according to the information in the frame.
9. The method of claim 7, wherein after demodulating the media access control layer of the frame, the station further comprises:
and if the station cannot correctly demodulate the media access control layer, the station ignores the value of the transmission opportunity ending bit and waits or enters a sleep state according to the information in the frame.
10. The method as claimed in claim 7, wherein after obtaining the value of the transmission opportunity end bit in the physical layer signal field of the frame and before the station demodulates the medium access control layer of the frame, the method further comprises:
and when the value of the transmission opportunity ending bit indicates that the transmission opportunity for transmitting the frame is not ended, the station waits or enters a sleep state according to the information in the frame.
11. A station, comprising:
the monitoring module is used for monitoring a channel;
the first demodulation module is used for demodulating the frames sensed by the sensing module to obtain first information in the frames, wherein the first information is used for identifying a basic service set;
a first contention module, configured to contend for the channel according to a value of a transmission opportunity end bit in a physical layer signal field of the frame to access the channel when the first information in the frame is the same as the first information known by the station.
12. The station of claim 11,
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 can correctly demodulate the medium access control layer, after determining that the frame belongs to the basic service set to which the station belongs according to the basic service set identifier of the medium access control header in the medium access control layer, contend for the channel according to a value of a transmission opportunity end bit in a physical layer signal field of the frame.
13. The station according to claim 11 or 12,
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, contend for the channel after the listening module continues to listen to the channel for the minimum media synchronization time; or,
the first contention module is specifically configured to wait for contention for the channel after the end of the frame when the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has not ended and no acknowledgement feedback is required.
14. The station of claim 12,
the first contention module is further configured to, when the first demodulation module cannot correctly demodulate the mac layer, ignore a value of a transmission opportunity end bit in a physical layer signal field of the frame, and contend for the channel.
15. The station according to claim 11 or 12, further comprising: a first determination module;
the first determining module is configured to determine that the frame does not belong to the basic service set to which the station belongs when the first information in the frame is different from the first information known to the station;
the listening module is further configured to, after the first determining module determines that the frame does not belong to the basic service set to which the station belongs, ignore a value of a transmission opportunity end bit in a physical layer signal field of the frame, and continue listening to the channel.
16. A station, comprising:
the analysis module is used for analyzing the received frame to obtain the value of the transmission opportunity ending bit in the physical layer signal field of the frame;
the second demodulation module is used for demodulating the media access control layer of the frame;
a second determining module, configured to determine, according to a basic service set identifier of a media access control header in the media access control layer, that the frame belongs to a basic service set to which the station belongs when the value of the transmission opportunity end bit indicates that the transmission opportunity for transmitting the frame has ended and the second demodulating module correctly demodulates the media access control layer;
a second competition module, configured to, after the second determining module determines that the frame belongs to the basic service set to which the station belongs, compete for a channel of the basic service set to access the channel.
17. The station of claim 16, further comprising: a first processing module;
the second determining module is further configured to determine, when the second demodulating module can correctly demodulate the media access control layer, that the frame does not belong to the basic service set to which the station belongs according to a basic service set identifier of a media access control header in the media access control layer;
the first processing module is configured to ignore the value of the transmission opportunity end bit and wait or enter a sleep state according to the information in the frame after the second determining module determines that the frame does not belong to the basic service set to which the station belongs.
18. The station of claim 16, further comprising:
and a second processing module, configured to ignore the value of the transmission opportunity end bit when the second demodulation module cannot correctly demodulate the mac layer, and wait or enter a sleep state according to the information in the frame.
19. The station of claim 16, further comprising:
and the third processing module is used for waiting or entering a sleep state according to the information in the frame when the value of the transmission opportunity ending bit indicates that the transmission opportunity for transmitting the frame is not ended yet.
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