CN106572489A

CN106572489A - Access and transmission method based on multi-BSS association

Info

Publication number: CN106572489A
Application number: CN201610957479.7A
Authority: CN
Inventors: 杨懋; 李波; 姬励; 闫中江
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2016-11-03
Filing date: 2016-11-03
Publication date: 2017-04-19
Anticipated expiration: 2036-11-03
Also published as: CN106572489B

Abstract

The invention provides an access and transmission method based on multi-BSS association and relates to the communication technical field. First, a cell edge node requests a multi-association process to a master AP so as to associate with a slave AP or associate with the slave AP and notify the master AP. Then, based on the EDCA mechanism, simultaneous back off is carried out, and resource request frames of the master AP and the slave AP are replied, orthogonal frequency-division multiple access (OFDMA) uplink transmission is executed through trigger frame scheduling of each AP, or OFDMA random access is formed by triggering TF-R of each AP. Finally, the cell edge node starts an association switching process. The access and transmission method based on multi-BSS association solves the problem that the cell edge user fairness is bad, adopts the multi-BSS association access and transmission scheme, improves the edge user access and data transmission performance, ensures the cell edge user access and transmission quality, and solves the problem the cell edge user is interfered by the adjacent cell.

Description

A kind of access associated based on many BSS and transmission method

Technical field

The present invention relates to communication technical field, the especially a kind of access of WLAN and transmission method.

Background technology

The media of the WLANs of IEEE 802.11 (Wireless Local Area Networks, WLAN) acquiescence are visited Ask that control (Multiple Access Control, MAC) agreement is that the carrier sense multiple with conflict avoidance function is accessed (Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA) agreement.The agreement In, some transmitting stations (station, STA) compete the broadcast channel right to use by specified rule so that certain website is possible to and it The transmission data of his dispatching station are clashed, and not only bring channel resource to waste, and also result in the throughput degradation and bag of network Average transmission time delay increases.Especially towards highly dense scene, Cell Edge User suffers from larger interference to next generation wlan, Therefore, it is difficult to the channel right to use is obtained, and transfer rate is relatively low.To ensure fairness, needs try to lift Cell Edge User Access and data transmission quality.As capacity of equipment is constantly lifted, node possesses while intercepting the ability of multiple channels, this is just Fairness problem for Cell Edge User provides more bases, and to work out more methods existing asking is solved Topic.

The content of the invention

In order to overcome the deficiencies in the prior art, it is contemplated that based under highly dense scene, using connecing that multiple cell is associated Enter and transmission method, solve the existing WLAN of IEEE 802.11 and lack the means for lifting edge customer access and data transfer, it is little Area edge user suffers from neighbor cell larger interference, so as to the problem that fairness is poor, lifts edge customer and accesses sum According to the performance of transmission.

The core content of the present invention mainly includes three parts, i.e., up process, descending process and main association handoff procedure. First, cell edge node is being experienced itself by larger interference or cannot preferably serviced for a long time positioned at cell edge Afterwards, many association process are carried out to primary wireless access points (access point, AP) request, be associated from AP or first with from AP Main AP is reinformed after being associated；Secondly, (Enhanced Distributed are accessed based on enhancement mode distributed coordination Channel Access, EDCA) mechanism is kept out of the way simultaneously in main plot and from cell, and reply main AP and the money from AP Ask (resource request, RR) frame, such as triggering-resource request frame (trigger frame-resource in source Request, TF-RR), and the orthogonal frequency for dispatching to perform of the trigger frame (trigger frame, TF) of each AP can be passed through Multiple access accesses (Orthogonal Frequency Division Multiple Access, OFDMA) uplink, Huo Zhetong Cross each AP triggering TF-R and form OFDMA Stochastic accessings；Finally, cell edge node finds that certain is from cell in for a long time Access and transmission performance is better than main plot, association handoff procedure can be started.

The detailed implementation steps of the technical solution adopted for the present invention to solve the technical problems are as follows：

Step 1：Cell Edge User node A arbitrarily selects the following two kinds implementation when many associations are carried out：

Implementation 1 is when Cell Edge User node A is in T₁Average interference in time is more than the interference threshold of regulation, Or T₁When average throughput is less than the throughput threshold for specifying in time, the interference threshold, throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is held, many associations are sent just to primary wireless access points AP (access point) Beginningization frame MA-INIT (Multi-associate initialization), main AP are received after many association initialization frames, Xiang Jie Point A returns many association initialization and agrees to frame MA-INIT-ACK (Multi-associate initialization Acknowledgement) or associate initialization more and disagree frame MA-INIT-NAK (Multi-associate Initialization not acknowledgement), if node A receives MA-INIT-ACK, node A intercepts multiple letters The multiple of other cells outside road, and the cell being subordinate to node A send multi-link application frame MA-Req (multi- from AP Access-request), no matter whether the plurality of main channel from AP identical, MA-Req send simultaneously in multiple channels or Send on each channel respectively successively；After node A sends MA-Req frames, according to the agreement of WLAN 802.11, it is not It is all from AP all can receive node A transmission MA-Req frames, receive from AP MA-Req frames be referred to as from AP it is to be selected from AP, it is to be selected From AP after MA-Req frames are received, return multi-link application to node A and agree to frame MA-Req-ACK (multi-access- Request acknowledgement) or multi-link application reject frame MA-Req-NAK (multi-access-request not acknowledgement)；If node A receives the MA-Req-ACK frames from AP to be selected, to node A MA-Req- is sent The to be selected of ACK frames forms incidence relation, i.e. node A to the to be selected from AP of node A transmission MA-Req-ACK frames from AP and node A Upper registration, sends the to be selected of MA-Req-ACK frames and provides service for node A from AP to node A, and step 2 is proceeded to afterwards；

If node A does not receive the ACK of main AP or do not receive any one MA-Req-ACK from AP, abandon many Basic Service Set BSS (Basic Service Set) associates flow process；

Implementation 2 is Cell Edge User node A in T₁Average interference in time is more than the interference threshold of regulation, or Person T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is held, multiple channels is intercepted and is sent multi-link application frame from AP to multiple MA-Req, no matter whether main AP and the main channel from AP are identical, and MA-Req sends or exists respectively successively simultaneously in multiple channels Each channel sends；Receive the MA-Req frames that node A sends selects agreement frame MA-Req-ACK or reject frame MA-Req- from AP The multi-link applications of NAK；If node A receives the MA-Req-ACK returned more than or equal to 1 AP, send multi-link application and agree to Frame MA_Rpt (multi-associate-report) informs many association results to main AP, that is, inform whether successfully and from AP set up Association, main AP is received after MA_Rpt frames, is returned multi-link request and is agreed to acknowledgement frame MA_Rpt ACK frame (multi- Associate-report acknowledgement) confirm, step 2 is proceeded to afterwards, if node A do not receive any one from The MA-Req-ACK of AP, then abandon many BSS associations flow processs；

Step 2：After the multi-link flow process successes of node A, in many association status, there is time limit X, X in many association status By the multi-link agreement of WLAN 802.11 regulation is supported, under many association status, if upstream data needs to send, Then execution step 3；If receiving main AP or the scheduling frame from AP, execution step 4；The lower line number for being sent to node A is received from AP According to bag, then execution step 5；If node A needs to switch main AP, execution step 6；

The time limit X of wherein many association status has two kinds of implementations：

Implementation 1 is stipulated time X, and X specifies that fringe node is in multiple cell BSS (Basic Service by agreement Set) connect after T time, after into many association status X times, automatic switchback main plot work is returned afterwards fringe node Step 1；

Implementation 2 is switched back into behind main plot for node A, needs to wait for a period of time D, and D is assisted by WLAN 802.11 View regulation, in time D transmission data is unable to, in order to avoid interfering to other users, if D=0, expression can stand after switching back Channel is used, that is, deteriorates to implementation 1, afterwards return to step 1；

Step 3：Node A accesses EDCA (Enhanced Distributed Channel based on enhancement mode distributed coordination Access) mechanism, backoff procedure is performed in main plot and from cell simultaneously, and in EDCA mechanism flow process is kept out of the way, little in master Area and contention window CW value is initialized respectively from cell, then kept out of the way, any one cell is kept out of the way after 0, you can perform Access and transmitting procedure, access and transmitting procedure there are three kinds of implementations, three kinds of implementations are described in detail below：

Implementation 1：The cell for reducing to 0 in retreat count is accessed, in corresponding access and transmitting procedure, Suo Youxin Road arbitrarily selects to keep out of the way mode, that is, select to keep out of the way again, or selects once to be moved back in the cell reservation do not kept out of the way at other Keep away count value to continue to keep out of the way；

Implementation 2：In current demand signal and interference plus noise than SINR (Signal to Interference plus Noise Ratio) highest cell or average SINR highests cell perform and access and transmitting procedure；

Implementation 3：The different districts of same channel, select SINR highests cell to perform and access and transmitting procedure；

Return to step 2 afterwards；

Step 4：Fringe node A replys the main AP and resource request RR (resource from AP after associating with multiple AP Request) frame, resource collects the scheduling of the TF that request RAR (resource allocation request) frame passes through each AP To perform based on orthogonal frequency-time multiple access OFDMA (Orthogonal Frequency Division Multiple Access) the uplink of technology, or triggering-resource request frame TF-RR (trigger frame- are triggered by each AP Resource request) OFDMA Stochastic accessings are formed, if i.e. AP is TF, then perform OFDMA；What if AP sent out It is TF-RR, then perform OFDMA Stochastic accessings；

Return to step 2；

Step 5：Node A step 1, step 2 with from after being successfully associated AP more, if being not received by being sent to section from AP The packet of point A, continues to intercept channel, performs according to 802.11 agreements；If receiving the packet for being sent to node A from AP, Modification ethernet packet header domain, by the destination address that the packet for being sent to node A is received from AP the MAC Address of node A is revised as, From AP amended packet is seen off by cable network again；

Main AP is received after the packet, can be transmitted to node A, afterwards return to step 2；

Step 6：Node A existence time thresholding T₂, T₂By the multi-link agreement of WLAN 802.11 regulation is supported, such as Fruit over-time thresholding T₂, when certain is less than main plot, or handling capacity higher than main plot from the interference of cell, then starts association and cut Process is changed, starting the premise of association handoff procedure is main BSS and belongs to same expansion service set ESS (Extended from BSS Service Set), association handoff procedure is：When node A sends association request again to be switched from AP (Reassociation Request) frame, receives from AP and reply association request again after Reassociation Request frames Acknowledgement frame (Reassociation Response) realizes association switching, or node A was subordinate to node A before many associations are carried out The main AP of cell sends disassociation Disassociation, realizes association switching.

The invention has the beneficial effects as follows the access and transmission method due to being associated using many BSS so that be interfered in the past Larger fringe node can carry out the transmission opportunitys for associating, increasing fringe node more with the AP of other cells, solve cell side Edge user fairness poor；Access and transmission plan as a result of many BSS associations, improve edge customer and access sum According to the performance of transmission, access and the transmission quality of Cell Edge User have been ensured so that access and transmission performance is improved, solve Cell Edge User of having determined is subject to the problem of neighbor cell larger interference.

Description of the drawings

Fig. 1 is the scene of many BSS associations of the invention, wherein have three BSS, STA to represent Cell Edge User node A, it is main AP represents the AP of STA places cell, and the AP of two other cell is represented from AP1, from AP2, i.e., AP to be selected.

Fig. 2 be it is descending during schematic diagram that ethernet packet header is modified.

Fig. 3 is main association handoff procedure schematic diagram, wherein, Reassociation Request be STA to it is to be switched from The claim frame that AP sends, Reassociation Response are received after Reassociation Request frames from AP Reply frame.Disassociation is the frame that node A sends to former main AP.

Fig. 4 is many association process figures of committed step of embodiment 1.

Fig. 5 is many association process figures of committed step of embodiment 2.

Fig. 6 is many association process figures of committed step of embodiment 3.

Fig. 7 is many association process figures of committed step of embodiment 4.

Fig. 8 is many association process figures of committed step of embodiment 5.

Fig. 9 is many association process figures of committed step of embodiment 6.

Figure 10 is the schematic diagram of a scenario of embodiment 7.

Figure 11 is many association process figures of committed step of embodiment 7.

Figure 12 is the schematic diagram of a scenario of embodiment 8 and embodiment 9.

Figure 13 is many association process figures of committed step of embodiment 8.

Figure 14 is many association process figures of committed step of embodiment 9.

Wherein, CRC is CRC Cyclic Redundancy Check, and channel is channel, and RTS is request Request To Send are sent, to keep out of the way Back Off, CTS is clear to send Clear To Send to BO.

Specific embodiment

With reference to the accompanying drawings and examples the present invention is further described.

The present invention can be realized in wireless network card by firmware, or be realized among the driver of wireless network card.

Fig. 1 is the scene of many BSS associations of the invention, wherein have three BSS, STA to represent Cell Edge User node A, it is main AP represents the AP of STA places cell, and the AP of two other cell is represented from AP1, from AP2, i.e., AP to be selected, in cell edge STA carries out associate more because experiencing itself by larger interference with from AP1.Fig. 2 be it is descending during ethernet packet header is entered The schematic diagram of row modification, by destination address by the MAC Address that node A is changed to from the MAC Address of AP.Fig. 3 is that main association switched Journey schematic diagram, wherein, Reassociation Request be STA to the to be switched claim frame sent from AP, Reassociation Response are that the reply frame after Reassociation Request frames is received from AP. Disassociation is the frame that node A sends to former main AP.

Specific implementation step is as follows：

Embodiment 1

Fig. 4 is many association process figures of committed step of embodiment 1, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP, and the main channel of main AP is channel1, is channel1 from the main channel of AP1, It is channel2 from the main channel of AP2, is all from AP from AP1 and from AP2.Example illustrates that being associated using many BSS The method of access so that when Cell Edge User sets up associate with the AP of other cells, first carry out Frame switch with main AP more, obtain After main AP agrees to, then on the different channels simultaneously to the method for sending many association request frames to set up many associations from AP.

Step 1：It is when Cell Edge User (STA) is in T₁Average interference in time is more than the interference threshold of regulation, or Person T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is held, to primary wireless access points AP many association initialization frame MA-INIT is sent, Main AP is received after many association initialization frames, is returned many association initialization to STA and is agreed to frame MA-INIT-ACK or many associations just Beginning disagrees frame MA-INIT-NAK, if STA receives MA-INIT-ACK, STA intercepts multiple channels, and is subordinate to STA Cell outside the multiple of other cells send multi-link application frame MA-Req from AP, no matter the plurality of main channel from AP Whether identical, MA-Req sends simultaneously in multiple channels；After STA sends MA-Req frames, according to WLAN 802.11 Agreement, it is not all from AP all can receive STA transmission MA-Req frames, receive from AP MA-Req frames from AP be referred to as it is to be selected from AP, it is to be selected from AP after MA-Req frames are received, return multi-link application to STA and agree to frame MA-Req-ACK or multi-link application Reject frame MA-Req-NAK；If STA receives the MA-Req-ACK frames from AP to be selected, to STA treating for MA-Req-ACK frames is sent Select from AP and STA and form incidence relation, i.e. STA in the registration from AP to be selected that MA-Req-ACK frames are sent to STA, send out to STA Send the to be selected of MA-Req-ACK frames to provide service for the STA from AP, step 2 is proceeded to afterwards；

If STA does not receive the MA-INIT-ACK of main AP or does not receive any one MA-Req-ACK from AP, Abandon many Basic Service Set BSS (Basic Service Set) association flow processs；

Comprise the following steps that：

Step 1.1：It is when Cell Edge User (STA) is in T₁Average interference in time is more than the interference threshold of regulation, Or T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is supported, to primary wireless access points AP many association initialization frame MA- are sent INIT；

Step 1.2：Main AP is received after many association initialization frame MA-INIT, is returned many association initialization to STA and is agreed to frame MA-INIT-ACK or many association initialization disagree frame MA-INIT-NAK.If returning many association initialization agrees to frame MA- INIT-ACK then goes to step 1.3, returns many association initialization and disagrees frame MA-INIT-NAK then return to step 1.1.

Step 1.3：STA receives MA-INIT-ACK, and STA intercepts multiple channels, and respectively in channel channel1 and Channel2 is upper to send multi-link application frame MA-Req frames to from AP1 and from AP2 simultaneously, and step 1.4 is proceeded to afterwards；

Step 1.4：From AP1 and from AP2 after MA-Req frames are received, reply in channel1 and channel2 respectively MA-Req-ACK frames or MA-Req-NAK frames, if frame MA-Req-ACK frames are returned step 1.5 is gone to, if returning MA-Req- NAK frames then return to step 1.1.；

Step 1.5：STA receives MA-Req-ACK frames, then with from AP1, from AP2 formed incidence relation, i.e. STA to STA sends registering from AP1, from AP2 for MA-Req-ACK frames, and to STA the to be selected from AP1, from AP2 of MA-Req-ACK frames is sent Service is provided for STA, step 2 is proceeded to afterwards；If receiving MA-Req-NAK frames, return to step 1.1.

Step 2：After the multi-link flow process successes of STA, in many association status, there is time limit X in many association status, X by The multi-link agreement of WLAN 802.11 regulation is supported, under many association status, if upstream data needs to send, then Execution step 3；If receiving main AP or the scheduling frame from AP, execution step 4；The downlink data packet for being sent to STA is received from AP, Then execution step 5；If STA needs to switch main AP, execution step 6；

Implementation 1 is stipulated time X, and X specifies that fringe node is in multiple cell BSS (Basic Service by agreement Set) connect after T time, after into many association status X times, automatic switchback main plot works fringe node STA, afterwards Return to step 1；

Implementation 2 is switched back into behind main plot for STA, needs to wait for a period of time D, and D is by the agreement of WLAN 802.11 Regulation, in time D transmission data is unable to, in order to avoid interfering to other users, if D=0, expression can be immediately after switching back Using channel, that is, implementation 1 is deteriorated to, afterwards return to step 1；

Step 3：STA accesses EDCA (Enhanced Distributed Channel based on enhancement mode distributed coordination Access) mechanism, backoff procedure is performed in main plot and from cell simultaneously, and in EDCA mechanism flow process is kept out of the way, little in master Area and contention window CW value is initialized respectively from cell, then kept out of the way, any one cell is kept out of the way after 0, you can perform Access and transmitting procedure, access and transmitting procedure there are three kinds of implementations, three kinds of implementations are described in detail below：

Implementation 1：The cell for reducing to 0 in retreat count is accessed, in corresponding access and transmitting procedure, all channels Arbitrarily select to keep out of the way mode, that is, select to keep out of the way again, or select the cell do not kept out of the way at other to retain and once keep out of the way Count value continues to keep out of the way；

Implementation 3：The different districts of same channel, select SINR highests cell to perform and access and transmit；

Return to step 2 afterwards；

Step 4：STA replys the main AP and resource request RR (resource from AP after associating with multiple AP Request) frame, collects the scheduling of frame and the TF for passing through each AP to perform based on orthogonal frequency-time multiple access OFDMA The uplink of (Orthogonal Frequency Division Multiple Access) technology, or by each AP Triggering triggering-resource request frame TF-RR (trigger frame-resource request) forms OFDMA Stochastic accessings, such as That fruit AP sends out is TF, then perform OFDMA；If that AP sends out is TF-RR, then perform OFDMA Stochastic accessings；

Return to step 2；

Step 5：STA in step 1, step 2 and from after being successfully associated AP more, if being not received by sending out STA's from AP Packet, continues to intercept channel, performs according to 802.11 agreements；If receiving the packet for being sent to STA from AP, ether is changed Net packet header domain, by the destination address that the packet for being sent to STA is received from AP the MAC Address of STA is revised as, again will modification from AP Packet afterwards is seen off by cable network；

Main AP is received after the packet, can be transmitted to STA, afterwards return to step 2；

Step 6：STA existence time thresholding T₂, T₂By the agreement of WLAN 802.11 regulation that support is multi-link, if Over-time thresholding T₂, when certain is less than main plot, or handling capacity higher than main plot from the interference of cell, then start association switching Process, starting the premise of association handoff procedure is main BSS and belongs to same expansion service set ESS (Extended from BSS Service Set), association handoff procedure is：When STA sends association request (Reassociation again to be switched from AP Request) frame, from AP reply Reassociation Response frame realities after Reassociation Request frames are received The main AP of the cell that now association switching, or STA was subordinate to STA before many associations are carried out sends disassociation (Disassociation) frame, realizes association switching.

Embodiment 2

Fig. 5 is many association process figures of committed step of embodiment 2, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP, and the main channel of main AP is channel1.It is channel1 from the main channel of AP1, It is channel2 from the main channel of AP2.Example illustrates that associating the method for accessing using many BSS so that cell side When edge user sets up associate more with the AP of other cells, first Frame switch is carried out with main AP, after obtaining main AP agreements, then in different letters Many association request frames are sent to from AP after elder generation on road, the method to set up many associations.

Step 1：It is when Cell Edge User (STA) is in T₁Average interference in time is more than the interference threshold of regulation, or Person T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is held, to primary wireless access points AP many association initialization frame MA-INIT is sent, Main AP is received after many association initialization frames, is returned many association initialization to STA and is agreed to frame MA-INIT-ACK or many associations just Beginning disagrees frame MA-INIT-NAK, if STA receives MA-INIT-ACK, STA intercepts multiple channels, and is subordinate to STA Cell outside the multiple of other cells send multi-link application frame MA-Req from AP, no matter the plurality of main channel from AP Whether identical, MA-Req is successively respectively in each channel transmission；After STA sends MA-Req frames, according to WLAN 802.11 agreements, the not all MA-Req frames that STA transmissions can be all received from AP, receive being referred to as from AP for MA-Req frames from AP It is to be selected from AP, it is to be selected from AP after MA-Req frames are received, return multi-link application to STA and agree to frame MA-Req-ACK or connect more Meet application reject frame MA-Req-NAK；If STA receives the MA-Req-ACK frames from AP to be selected, to STA MA-Req-ACK is sent The to be selected of frame forms incidence relation, i.e. STA and registers from AP sending the to be selected of MA-Req-ACK frames to STA from AP and STA, to STA sends the to be selected of MA-Req-ACK frames and provides service for the STA from AP, and step 2 is proceeded to afterwards；

Comprise the following steps that：

Step 1.1：STA is in T₁Average interference in time is more than the interference threshold of regulation, or T₁Average throughput in time Amount less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By the wireless local that support is multi-link The agreement of net 802.11 specifies, sends to primary wireless access points AP and associate initialization frame MA-INIT more；

Step 1.2：Main AP is received after many association initialization frames, is returned many association initialization to STA and is agreed to frame MA- INIT-ACK or many association initialization disagree frame MA-INIT-NAK.If returning many association initialization agrees to frame MA-INIT- ACK then goes to step 1.3, association initialization is returned if returning and disagrees frame MA-INIT-NAK steps 1.1.

Step 1.3：STA is received after MA-INIT-ACK frames, intercepts multiple channels, to from AP1 on channel channel Send it is multi-link application frame MA-Req frames, from AP1 after MA-Req frames are received, channel1 reply MA-Req-ACK frames or Person's MA-Req-NAK frames；If STA receives MA-Req-ACK frames, it is associated with AP1, step 1.4 is proceeded to afterwards；If receiving MA-Req NAK frames, then return to step 1.1.

Step 1.4：STA be associated from AP1 after, send multi-link application frame to from AP2 on channel channel2 MA-Req frames, from AP2 after MA-Req frames are received, in channel2 MA-Req ACK frames or MA-Req NAK frames are replied； If STA receives MA-Req ACK frames, associate with AP2 rows, step 2 is proceeded to afterwards；If receiving MA-Req NAK frames, return Step 1.1.

Return to step 2 afterwards；

Return to step 2；

Step 6：STA existence time thresholding T₂, T₂By the agreement of WLAN 802.11 regulation that support is multi-link, if Over-time thresholding T₂, when certain is less than main plot, or handling capacity higher than main plot from the interference of cell, then start association switching Process, starting the premise of association handoff procedure is main BSS and belongs to same expansion service set ESS (Extended from BSS Service Set), association handoff procedure is：When STA sends association request Reassociation again to be switched from AP Request frames, receive from AP and reply after Reassociation Request frames the realization of Reassociation Response frames Association switches, or STA sends disassociation Disassociation to STA in the main AP of the cell for carrying out being subordinate to before associating more Frame, realizes association switching.

Embodiment 3

Fig. 6 is many association process figures of committed step of embodiment 3, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP, and the main channel of main AP is channel1.It is channel1 from the main channel of AP1, It is channel2 from the main channel of AP2, is all from AP from AP1 and from AP2.Example illustrates that being associated using many BSS The method of access so that the AP of Cell Edge User and other cells sets up many when associate, first simultaneously to different channels from AP Many association request frames are sent, after obtaining from AP agreeing to, the method for reinforming main AP to set up many associations.

Step 1：Cell Edge User STA is in T₁Average interference in time is more than the interference threshold of regulation, or T₁Time Interior average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁It is multi-link by supporting The agreement of WLAN 802.11 regulation, intercept multiple channels and send multi-link application frame MA-Req, nothing from AP to multiple Whether identical by main AP and the main channel from AP, MA-Req sends simultaneously in multiple channels；Receive the MA-Req frames of STA transmissions Select from AP agree to frame MA-Req ACK or the multi-link applications of reject frame MA-Req NAK；If STA is received more than or equal to 1 The MA-Req ACK that AP is returned, then send multi-link application and agree to frame MA_Rpt (multi-associate-report) to main AP Many association results are informed, that is, informs whether success is associated with setting up from AP, and main AP is received after MA_Rpt frames, returns MA_Rpt- ACK confirmations, proceed to afterwards step 2, if not receiving any one ACK from AP, abandon many BSS associations flow processs.Concrete step It is rapid as follows：

Step 1.1：STA is calculated in T₁Average interference in time is more than the interference threshold of regulation, or T₁It is average in time Handling capacity less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁It is multi-link wireless by supporting The agreement of LAN 802.11 regulation, proceeds to afterwards step 1.2；

Step 1.2：STA intercepts the two 2 channels of channel1 and channel2, and while on two channels to from AP1 and multi-link application frame MA-Req is sent from AP2, step 1.3 is proceeded to afterwards；

Step 1.3：Receive application frame MA-Req from AP1 and from AP2 after MA-Req frames are received, exist respectively Select to send on channel1 and channel2 to agree to frame MA-Req-ACK or the multi-link applications of reject frame MA-Req-NAK；If Send MA-Req-ACK and then proceed to step 1.4, if MA-Req-NAK is sent step 1.1 is proceeded to；

Step 1.4：If STA receives the MA-Req-ACK frames from AP1 and from AP2, and closed from AP1, from AP2 Connection, retransmits MA_Rpt frames and informs many association results to main AP, and step 1.5 is proceeded to afterwards；If receiving MA-Req NAK frames, Return to step 1.1；

Step 1.5：Main AP is received after MA-Rpt frames, and to STA MA-Rpt-ACK frame acknowledgments are sent, and step 2 is proceeded to afterwards, If not receiving any one ACK from AP, many BSS associations flow processs are abandoned.；

Return to step 2 afterwards；

Return to step 2；

Embodiment 4

Fig. 7 is many association process figures of committed step of embodiment 4, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP, and the main channel of main AP is channel1.It is channel1 from the main channel of AP1, It is channel2 from the main channel of AP2.Example illustrates that associating the method for accessing using many BSS so that cell side When edge user sets up associate with the AP of other cells, first successively many association request frames are sent from AP to different channels more, obtain The method for reinforming main AP to set up many associations after agreeing to from AP.

Step 1：Cell Edge User (STA) is in T₁Average interference in time is more than the interference threshold of regulation, or T₁When Interior average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁Connected by support The agreement of WLAN 802.11 regulation for connecing, intercepts multiple channels and sends multi-link application frame MA-Req from AP to multiple, No matter whether main AP and the main channel from AP are identical, and MA-Req sends in each channel respectively successively；Receive the MA- of STA transmissions The selecting from AP of Req frames agrees to frame MA-Req ACK or the multi-link applications of reject frame MA-Req NAK；If STA receive more than etc. In the MA-Req ACK that 1 AP is returned, then send multi-link application and agree to frame MA_Rpt (multi-associate-report) Many association results are informed to main AP, that is, informs whether success is associated with setting up from AP, and main AP is received after MA_Rpt frames, is returned MA_Rpt-ACK confirmations, proceed to afterwards step 2, if not receiving any one ACK from AP, abandon many BSS associations flow processs. Comprise the following steps that：

Step 1.1：STA is in T₁Average interference in time is more than the interference threshold of regulation, or T₁Average throughput in time Amount less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By the wireless local that support is multi-link The agreement of net 802.11 specifies.

Step 1.2：Intercept the two 2 channels of channel1 and channel2, and to from AP1 on channel1 channels Send multi-link application frame MA-Req；

Step 1.3：From AP1 after MA-Req frames are received, according in channel1 MA-Req-ACK frames or MA- are replied Req-NAK frames；

Step 1.4：If STA receives the MA-Req-ACK frames from AP1, and it is associated from AP1, step is proceeded to afterwards 1.5；If receiving MA-Req-NAK frames, return to step 1.1.

Step 1.5：STA be associated from AP1 after, send multi-link application frame to from AP2 on channel2 channels MA-Req, from AP2 after MA-Req frames are received, in channel2 MA-Req-ACK frames or MA-Req-NAK frames is replied, it After proceed to step 1.6；

Step 1.6：STA receives the MA-Req-ACK frames from AP2, and is associated from AP2, and step 1.7 is proceeded to afterwards； If receiving MA-Req-NAK frames, return to step 1.1.

Step 1.7：Main AP is received after MA-Rpt frames, and to main AP MA-Rpt-ACK frame acknowledgments are sent；Step is proceeded to afterwards 2, otherwise abandon many BSS associations flow processs；

Return to step 2 afterwards；

Return to step 2；

Embodiment 5

Fig. 8 is many association process figures of committed step of embodiment 5, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP.The AP of two other BSS is respectively from AP1 and from AP2.The cell that main AP is located For main plot, it, from cell 1, is from cell 2 from AP2 places cell to be from AP1 places cell.Example illustrates that using The method that many BSS association is accessed so that Cell Edge User with set up after associate from AP more, in main plot and from cell while moving back Keep away, accessed in the cell for keeping out of the way 0, and once pass in channels reservation that other have not been kept out of the way when keeping out of the way next time Transmission of data, the method that the remaining backoff value of other channels continues to keep out of the way when a channel keeps out of the way 0.

Step 1：Cell Edge User STA arbitrarily selects the following two kinds implementation when many associations are carried out：

Implementation 1 is when Cell Edge User STA is in T₁Average interference in time is more than the interference threshold of regulation, or Person T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By The multi-link agreement of WLAN 802.11 regulation is held, many associations are sent just to primary wireless access points AP (access point) Beginningization frame MA-INIT (Multi-associate initialization), main AP are received after many association initialization frames, to STA returns many association initialization and agrees to frame MA-INIT-ACK (Multi-associate initialization Acknowledgement) or associate initialization more and disagree frame MA-INIT-NAK (Multi-associate Initialization not acknowledgement), if STA receives MA-INIT-ACK, STA intercepts multiple channels, and The multiple of other cells outside the cell being subordinate to STA send multi-link application frame MA-Req (multi-access- from AP Request), no matter whether the plurality of main channel from AP is identical, MA-Req sends or divides successively simultaneously in multiple channels Do not send on each channel；It is not all from AP according to the agreement of WLAN 802.11 after STA sends MA-Req frames Will receive STA transmission MA-Req frames, receive from AP MA-Req frames be referred to as from AP it is to be selected from AP, it is to be selected to receive from AP After MA-Req frames, return multi-link application to STA and agree to frame MA-Req-ACK (multi-access-request ) or multi-link application reject frame MA-Req-NAK (multi-access-request not acknowledgement acknowledgement)；If STA receives the MA-Req-ACK frames from AP to be selected, to STA treating for MA-Req-ACK frames is sent Select from AP and STA and form incidence relation, i.e. STA in the registration from AP to be selected that MA-Req-ACK frames are sent to STA, send out to STA Send the to be selected of MA-Req-ACK frames to provide service for the STA from AP, step 2 is proceeded to afterwards；

Implementation 2 is Cell Edge User STA in T₁Average interference in time is more than the interference threshold of regulation, or T₁In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁By supporting The multi-link agreement of WLAN 802.11 regulation, intercepts multiple channels and sends multi-link application frame MA- from AP to multiple Req, no matter whether main AP and the main channel from AP are identical, and MA-Req sends or successively respectively each simultaneously in multiple channels Send on individual channel；Receive the MA-Req frames that STA sends selects agreement frame MA-Req-ACK or reject frame MA-Req- from AP The multi-link applications of NAK；If STA receives the MA-Req-ACK returned more than or equal to 1 AP, send multi-link application and agree to frame MA_Rpt (multi-associate-report) informs many association results to main AP, that is, inform whether success is closed with setting up from AP Connection, main AP is received after MA_Rpt frames, returns MA_Rpt ACK frame (multi-associate-report Acknowledgement) confirm, step 2 is proceeded to afterwards, if STA does not receive any one MA-Req-ACK from AP, put Abandon many BSS associations flow processs；

Step 3：STA accesses EDCA mechanism based on enhancement mode distributed coordination, and in main plot and from cell, simultaneously execution is moved back Journey is circumvented, in EDCA mechanism flow process is kept out of the way, in main plot and from cell contention window CW value is initialized respectively, then carried out Keep out of the way, any one cell is kept out of the way after 0, you can perform and access and transmitting procedure, the cell for reducing to 0 in retreat count connects Enter, in corresponding access and transmitting procedure, all channels arbitrarily select to keep out of the way mode, that is, select to keep out of the way again, or select The cell that other have not been kept out of the way retains last retreat count and continues to keep out of the way；

Step 3.1：STA with from AP1 and from after the completion of many associations of AP2, based on EDCA mechanism, in main plot and from little Area performs stochastic backoff process simultaneously, proceeds to step 3.1.

Step 3.2：STA is taking the lead in completing to keep out of the way from cell 1, that is, keep out of the way 0, then accessed from cell 1, proceeds to step Rapid 3.3；

Step 3.3：STA is being accessed and transmitted from cell 1, and when next time is accessed, all channels arbitrarily select the side of keeping out of the way Formula, that is, select to keep out of the way again, or selection retains once retreat count and continues to keep out of the way in other cells do not kept out of the way. Return to step 2；

Return to step 2；

Embodiment 6

Fig. 9 is many association process figures of committed step of embodiment 6, it is assumed that have 3 BSS, each BSS to have one in network AP.STA in the present embodiment is under the jurisdiction of main AP.The AP of two other BSS is respectively from AP1 and from AP2, from AP1 and from AP2 It is from AP.The cell that main AP is located is main plot, and it, from cell 1, is from cell 2 from AP2 places cell to be from AP1 places cell. Example illustrates that associating the method for accessing using many BSS so that after Cell Edge User is associated more with setting up from AP, Keep out of the way simultaneously in main plot and from cell, a cell takes the lead in completing to keep out of the way, but is connect in another SINR highest cell The method for entering.

Step 3：STA is based on EDCA mechanism, stochastic backoff process is performed simultaneously in main plot and from cell, according to EDCA machines Keep out of the way flow process in system, in main plot and from cell contention window CW value is initialized respectively, then kept out of the way, any one cell Keep out of the way after 0, accessed in another average sinr value highest cell.

Step 3.1：STA with from AP1 and from after the completion of many associations of AP2, based on EDCA mechanism, in main plot and from little Area performs stochastic backoff process simultaneously.

Step 3.2：STA is taking the lead in completing to keep out of the way from cell 2, that is, keep out of the way 0；

Step 3.3：STA is accessed and transmitted in average sinr value highest cell (from cell 1), afterwards return to step 2；

Return to step 2；

Embodiment 7

Figure 10 is the schematic diagram of a scenario of embodiment 7, and Figure 11 is many association process figures of committed step of embodiment 7, it is assumed that net There are 4 BSS, the STA in the present embodiment to be under the jurisdiction of main AP in network.The cell that main AP is located is main plot, and from AP1 places, cell is From cell 1, it, from cell 2, is, from cell 3, one to be shared from cell 3 from cell 2 from AP3 places cell to be from AP2 places cell Channel.Example illustrates that associating the method for accessing using many BSS so that Cell Edge User enters many association status Afterwards, in the time limit T that agreement specifies during uplink transmission data, the method from AP transmission datas of first backward different channels.

Step 2.1：In time T, STA first with the access and transmission that data are carried out from AP1, then with shared same channel Carry out data transmission from AP2 and from AP3, after time T, switch back into main plot；

Step 2.2：After switching back into main plot, wait for a period of time D, D by the agreement of WLAN 802.11 specify, when Between be unable to transmission data in D, in order to avoid interfering to other users, after time D, if D=0, expression can stand after switching back Channel is used, that is, deteriorates to implementation 1, afterwards return to step 1；

Step 3：STA accesses EDCA (Enhanced Distributed Channel based on enhancement mode distributed coordination Access) mechanism, backoff procedure is performed in main plot and from cell simultaneously, and in EDCA mechanism flow process is kept out of the way, little in master Area and contention window CW value being initialized respectively from cell, then being kept out of the way, any one cell is kept out of the way after 0, is believed currently Number perform than SINR highests cell or average SINR highests cell with interference plus noise and to access and transmitting procedure.

Step 3.1：STA with from AP1, from AP2 and from after the completion of many associations of AP3, based on EDCA mechanism, in main plot Stochastic backoff process is performed with from cell simultaneously.

Step 3.2：After STA completes to keep out of the way, to from AP1 simultaneously uplink transmission data is accessed；

Step 3.3：Share same channel from cell 2 and from cell 3, STA with from after the completion of AP1 transmission datas, again Keep out of the way, after the completion of keeping out of the way, hold than SINR highests cell or average SINR highests cell with interference plus noise in current demand signal Row is accessed and transmitting procedure；Return to step 2.

Return to step 2；

Embodiment 8

Figure 12 is the schematic diagram of a scenario of embodiment 8, and Figure 13 is many association process figures of committed step of embodiment 8.Assume net There are 3 BSS, each BSS to have an AP in network.STA in the present embodiment is under the jurisdiction of main AP.The AP difference of two other BSS It is, from AP1 and from AP2, from AP1 and from AP2 same channel to be not operate at.Example illustrates that being connect using many BSS associations The method for entering so that Cell Edge User is entered after many association status, in the time limit T that agreement specifies during uplink transmission data, Simultaneously to the method from AP transmission datas of different channels.

Step 2.2：After switching back into main plot, wait for a period of time D, and D is specified by the agreement of WLAN 802.11, in D Transmission data is inside unable to, in order to avoid interfering to other users, after time D, if D=0, expression can make immediately after switching back With channel, that is, implementation 1 is deteriorated to, afterwards return to step 1；

Step 3.1：STA adopts above-mentioned implementation method, is accessed after the completion of keeping out of the way；

Step 3.2：STA with from cell 1, is accessed and transmission data from cell 2 simultaneously；Return to step 2 afterwards.

Return to step 2；

Embodiment 9

Figure 12 is the schematic diagram of a scenario of embodiment 9, and Figure 14 is many association process figures of committed step of embodiment 9.Assume net There are 3 BSS, each BSS to have an AP in network.STA in the present embodiment is under the jurisdiction of main AP.The AP difference of two other BSS It is from AP1 and from AP2.Example illustrates that associating the method for accessing using many BSS so that Cell Edge User is entered After many association status, after uplink transmission data in the time limit T that agreement specifies, after switching back into main plot, discovery cannot transmit number According to the method for first not carrying out data transmission freezing to start again to carry out access and transmission data with main AP after a period of time D.

Step 2.1：In time T, STA with carry out uplink, time T simultaneously from AP1 and from AP2 after, switch back into Main plot；

Step 2.2：After switching back into main plot, STA find cannot transmission data, when first not carrying out data transmission freezing one section Between D, in order to avoid interfering other users, then start to be accessed with main AP and transmission data.Return to step 1 afterwards.

Return to step 2；

Step 5：STA in step 1, step 2 and from after being successfully associated AP more, if being not received by sending out STA's from AP Packet, continues to intercept channel, performs according to 802.11 agreements；If receiving the packet for being sent to STA from AP, ether is changed Net packet header domain, by the destination address that the packet for being sent to node A is received from AP the MAC Address of STA is revised as, and will be repaiied again from AP Packet after changing is seen off by cable network；

Claims

1. it is a kind of based on many BSS associate access with transmission method, it is characterised in that comprise the steps：

Implementation 1 is when Cell Edge User node A is in T₁Average interference in time is more than the interference threshold of regulation, or T₁When average throughput is less than the throughput threshold for specifying in time, the interference threshold, throughput threshold and T₁It is many by supporting The agreement of WLAN 802.11 regulation of connection, to primary wireless access points AP (access point) many association initialization are sent Frame MA-INIT (Multi-associate initialization), main AP are received after many association initialization frames, to node A Return many association initialization and agree to frame MA-INIT-ACK (Multi-associate initialization Acknowledgement) or associate initialization more and disagree frame MA-INIT-NAK (Multi-associate Initialization not acknowledgement), if node A receives MA-INIT-ACK, node A intercepts multiple letters The multiple of other cells outside road, and the cell being subordinate to node A send multi-link application frame MA-Req (multi- from AP Access-request), no matter whether the plurality of main channel from AP identical, MA-Req send simultaneously in multiple channels or Send on each channel respectively successively；After node A sends MA-Req frames, according to the agreement of WLAN 802.11, it is not It is all from AP all can receive node A transmission MA-Req frames, receive from AP MA-Req frames be referred to as from AP it is to be selected from AP, it is to be selected From AP after MA-Req frames are received, return multi-link application to node A and agree to frame MA-Req-ACK (multi-access- Request acknowledgement) or multi-link application reject frame MA-Req-NAK (multi-access-request not acknowledgement)；If node A receives the MA-Req-ACK frames from AP to be selected, to node A MA-Req- is sent The to be selected of ACK frames forms incidence relation, i.e. node A to the to be selected from AP of node A transmission MA-Req-ACK frames from AP and node A Upper registration, sends the to be selected of MA-Req-ACK frames and provides service for node A from AP to node A, and step 2 is proceeded to afterwards；

If node A does not receive the ACK of main AP or do not receive any one MA-Req-ACK from AP, how basic abandon Services set BSS (Basic Service Set) associates flow process；

Implementation 2 is Cell Edge User node A in T₁Average interference in time is more than the interference threshold of regulation, or T₁ In time average throughput less than regulation throughput threshold when, the interference threshold and throughput threshold and T₁It is many by supporting The agreement of WLAN 802.11 regulation of connection, intercepts multiple channels and sends multi-link application frame MA- from AP to multiple Req, no matter whether main AP and the main channel from AP are identical, and MA-Req sends or successively respectively at each simultaneously in multiple channels Channel sends；Receive the MA-Req frames that node A sends selects agreement frame MA-Req-ACK or reject frame MA-Req-NAK from AP Multi-link application；If node A receives the MA-Req-ACK returned more than or equal to 1 AP, send multi-link application and agree to frame MA_Rpt (multi-associate-report) informs many association results to main AP, that is, inform whether success is closed with setting up from AP Connection, main AP is received after MA_Rpt frames, is returned multi-link request and is agreed to acknowledgement frame MA_RptACK frame (multi-associate- Report acknowledgement) confirm, step 2 is proceeded to afterwards, if node A does not receive any one MA- from AP Req-ACK, then abandon many BSS associations flow processs；

Step 2：After the multi-link flow process successes of node A, in many association status, there is time limit X in many association status, X by The multi-link agreement of WLAN 802.11 regulation is held, under many association status, if upstream data needs to send, is then held Row step 3；If receiving main AP or the scheduling frame from AP, execution step 4；The downlink data packet for being sent to node A is received from AP, Then execution step 5；If node A needs to switch main AP, execution step 6；

Implementation 1 is stipulated time X, and X is specified that fringe node connects in multiple cell BSS (Basic Service Set) by agreement After connecing T time, after into many association status X times, automatic switchback main plot works fringe node, afterwards return to step 1；

Implementation 2 is switched back into behind main plot for node A, needs to wait for a period of time D, and D is advised by the agreement of WLAN 802.11 It is fixed, transmission data is unable in time D, in order to avoid interfering to other users, if D=0, expression can make immediately after switching back With channel, that is, implementation 1 is deteriorated to, afterwards return to step 1；

Implementation 1：The cell for reducing to 0 in retreat count is accessed, in corresponding access and transmitting procedure, all channels are appointed Mode is kept out of the way in meaning selection, that is, select to keep out of the way again, or selects once to keep out of the way meter in the cell reservation do not kept out of the way at other Numerical value continues to keep out of the way；

Implementation 2：In current demand signal and interference plus noise than SINR (Signal to Interference plus Noise Ratio) highest cell or average SINR highests cell are performed and accessed and transmitting procedure；

Return to step 2 afterwards；

Return to step 2；

Step 5：Node A step 1, step 2 with from after being successfully associated AP more, if being not received by being sent to node A from AP Packet, continue to intercept channel, according to 802.11 agreements perform；If receiving the packet for being sent to node A from AP, modification Ethernet packet header domain, by the destination address that the packet for being sent to node A is received from AP the MAC Address of node A is revised as, from AP Amended packet is seen off by cable network again；

Step 6：Node A existence time thresholding T₂, T₂By the multi-link agreement of WLAN 802.11 regulation is supported, if super Cross time threshold T₂, when certain is less than main plot, or handling capacity higher than main plot from the interference of cell, then starts association and switched Journey, starting the premise of association handoff procedure is main BSS and belongs to same expansion service set ESS (Extended from BSS Service Set), association handoff procedure is：When node A sends association request again to be switched from AP (Reassociation Request) frame, receives from AP and reply association request again after Reassociation Request frames Acknowledgement frame (Reassociation Response) realizes association switching, or node A was subordinate to node A before many associations are carried out The main AP of cell sends disassociation Disassociation, realizes association switching.