CN102752823B - Method for switching user terminal between access joints in WLAN (Wireless Local Area Network) based on AP (Access Point) collaboration - Google Patents
Method for switching user terminal between access joints in WLAN (Wireless Local Area Network) based on AP (Access Point) collaboration Download PDFInfo
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- CN102752823B CN102752823B CN201210229763.4A CN201210229763A CN102752823B CN 102752823 B CN102752823 B CN 102752823B CN 201210229763 A CN201210229763 A CN 201210229763A CN 102752823 B CN102752823 B CN 102752823B
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Abstract
The invention provides a method for switching a user terminal between access joints in a WLAN (Wireless Local Area Network) based on AP (Access Point) collaboration. The switching method is mainly used for solving the problems in the prior art that the switching delay is overlong, and the switching mode is single. The method is technically characterized in that two selecting modes including a driving switching mode and a driven switching mode are adopted, wherein the driving switching mode is used for carrying out the switching from a network side; under a condition that a current AP is overloaded, the driving switch can be started for the AP, and an STA (Single Threaded Apartment) of the user terminal is selected from an STA set of the currently-connected user terminal and then is switched into an adjacent AP; if the communication quality of the STA of the user terminal is degraded, the driven switching mode can be automatically started through the STA of the user terminal, and the STA is switched into an optimal AP; and under the driving switching mode and the driven switching mode, channels to be scanned are subjected to priority ranking, and the time for scanning each channel is dynamically adjusted. The switching method has the advantages of less switching delay and high success rate in scanning and can be applied to distribution type wireless local networks with basic network support.
Description
Technical field
The invention belongs to communication technical field, the method that particularly user terminal in wireless LAN switches between access point, can be used for the optimization of wireless lan network side and user's side communication quality.
Background technology
In recent years, wireless local area network technology has obtained development and successful application rapidly, and popularity improves constantly.WLAN (wireless local area network) WLAN provides fast, efficiently and WLAN (wireless local area network) access service cheaply for people.Access Internet by wlan network and can provide various services for user, such as VoIP, multimedia and transfer of data etc.For these application and service, continual and steady network insertion becomes inevitable requirement.In WLAN, user terminal STA, by access point AP access network, that is to say, STA must pass through by AP ability access network and other STA.Because the covering power of wlan network access point AP is limited, in order to expand the coverage of WLAN, can arrange many AP and facilitate the access of STA.When STA is due to mobile and away from current connected AP, or these reasons that the too many traffic of STA that current AP connects is too large etc., while causing the communication quality of STA to drop to a certain degree, other AP that STA can find around access the communication quality that keeps good, the handoff technique in Here it is WLAN.Handoff technique is exactly briefly that STA passes through series of steps, and disconnection is connected with current AP's, selects a best AP to be attached thereto communication, in STA handoff procedure, can suspend current communication, can the original communication of continuation after having switched.
Handoff procedure logically can be divided into three phases: scanning discovery stage, authentication phase, association phase again, wherein:
First step sweep phase
The effect of sweep phase is exactly that STA finds and own which has can be for the AP of service is provided oneself around, and knows this AP and own quality of connection, then from these AP, selects a best AP as switching target.Scan mode has drive sweep and two kinds of modes of active scan.802.11 agreements specify that AP has the beacon frame of self information by the broadcast on the channel of work own of the periodicity of 100ms, and drive sweep is to know the own RSSI of AP around by STA passive receive AP beacon frame.STA, in the time carrying out drive sweep, need to wait on scanning channel that the regular hour is to guarantee to receive the beacon frame of AP.Be that 11,802.11a is 13 in the number of available channels of China 802.11b/g.If STA scans each channel, and stop 100ms on each channel, scanning delay will reach 1100ms, cannot meet the requirement of real time business at all.Active scan is initiatively initiated by STA, and STA sends the Probe Request frame of inquiring after successively on each channel, and AP receives Probe Request frame and replys Probe Response.The Probe Response frame that STA returns by the AP receiving on this channel, knows the RSSI of AP around.In active scan, two values are defined: minimum channel time and maximum channel time.If STA receives the Probe Response frame that AP sends within the minimum channel time, STA continues to wait for until the maximum channel time on this channel, to guarantee to receive the response of AP all on this channel.If STA does not receive the response of any AP within the minimum channel time, think and do not have AP to be operated on this channel around, STA carries out the scanning of next channel immediately.
Second step authentication phase
STA successfully finds after some new AP, and while therefrom selecting an optimum AP to communicate, must, by the certification of AP, could communicate with this AP, could access network.No matter be which kind of authentication mode, necessary step is that STA sends authentication request information to AP, and AP sends authentication success or failed response to website after certification, and authentication mode is safer, and time delay is larger.
The heavy association phase of the 3rd step
Complete above after two steps, STA sends the claim frame of series of fortified passes connection to new connection AP, and AP sends it back the response frame of series of fortified passes connection to website.STA and new AP have completed association process like this, and STA just can carry out the transmission of data between network.The time delay of heavy association process is the exchange process of heavy disassociation frame, and website is received after the message of success identity, sends the request message of series of fortified passes connection to AP, has just completed switching after receiving the series of fortified passes connection respective frame of AP.
In handoff procedure, there will be a lot of problems, wherein handover delay is of paramount importance with finding best AP.Handover delay is crossed senior general and is had influence on significantly the communication quality that the real-time such as VoIP is served.Handover delay is mainly made up of the time delay of above three phases: scanning delay, authentication time delay and reconnect time delay.By a large amount of research, scanning delay has accounted for the more than 90% of handover delay, authentication time delay and to reconnect time delay shorter, and therefore scanning process is also the emphasis of optimizing in handoff procedure.Likely cause repeatedly switching if the AP being switched to is not best AP, also easily cause the decline of user terminal communication quality.
For the problem occurring in user terminal handoff procedure in WLAN, a lot of relevant solutions are there are in recent years
Certainly way, but these methods all exist certain deficiency.Such as the Tuning algorithm based on adjusting minimum channel time and maximum channel time, it is especially little that the method arranges these two values, this has obtained effect on minimizing handover delay, but easily cause scanning unsuccessfully, but namely on channel, may have AP too small due to minimum channel time and maximum channel set of time, the time that STA treats on channel is too short and cause accepting the response of AP.This algorithm is only to consider from STA end simultaneously, namely only switches and triggers from STA, and do not consider the factor of network side, easily causes terminal to be switched to non-best AP and duplicates the problem of switching.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, the changing method of user terminal between access point in a kind of WLAN based on AP cooperation proposed, to reduce handover delay, improve the continuity that user terminal is communicated by letter in handoff procedure, and ensure that STA is switched to best AP, avoid repeating switching.
For achieving the above object, technical scheme of the present invention comprises the steps:
(1) current access point AP
awith neighboring access point AP
bregularly carry out information exchange, make current access point AP
aobtain neighboring access point AP
binformation, this information comprises neighboring access point AP
bworking channel number and load;
(2) current access point AP
aby the neighboring access point AP obtaining
binformation, is handed down to and current access point AP by the mode of beacon frame
athe user terminal STA connecting;
(3) user terminal STA receives current access point AP
athe neighboring access point AP issuing
binformation after, check current acknowledge(ment) signal intensity RSSI, if current RSSI is less than the passive handoff threshold T of setting
a=75dB, execution step (4) starts passive switching, otherwise execution step (5);
(4) user terminal STA is to current access point AP
asend passive handover request, start passive switching;
4a) user terminal STA utilizes current access point AP
athe information issuing is determined scanning set, is about to appear at the neighboring access point AP in information
bbe defined as scanning set;
4b) user terminal STA calculates respectively each neighboring access point AP in own and scanning set
bdistance, according to distance determine priority, distance nearlyer priority higher;
4c) user terminal STA selective channel from scanning set, is 1,6,11 these three channels if having channel number in scanning set, preferentially selects this three channels, otherwise, select the channel that priority is the highest and be not scanned;
4d) user terminal STA is switched to the channel of selection, and on scanning channel, sends probe request Probe Request, and the initial value of minimum channel time MinT and maximum channel time MaxT is respectively 10ms and 20ms;
4e) user terminal STA is according to whether receiving that in minimum channel time MinT probing response frame Probe Response determines execution step, if user terminal STA receives probing response frame Probe Response in minimum channel time MinT, execution step (4f), otherwise, execution step (4g);
4f) user terminal STA stops after maximum channel time MaxT on scanning channel, select next channel, and reducing the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (4c) is to (4e), until scanned all channels;
4g) user terminal STA stops after minimum channel time MinT on scanning channel, selects next channel, and increases the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, and repeating step (4c) is to (4e), until scanned all channels;
4h) user terminal STA is according to acknowledge(ment) signal intensity RSSI, and from scanning result, selecting acknowledge(ment) signal intensity RSSI the maximum is that best access point AP switches, and completes passive switching;
(5) current access point AP
acheck whether self overloads, and check the passive handover request of whether receiving that user terminal STA sends, if current access point AP
aoverload and do not receive the passive handover request that user terminal STA sends, current access point AP
astart initiatively and switch, execution step (6), otherwise, current access point AP
aoneself state is checked in circulation;
(6) current access point AP
astart initiatively and switch, and to current access point AP
athe user terminal STA connecting issues initiatively switch frame.
Described active is switched, and carries out as follows:
6a) receive that initiatively the user terminal STA of switch frame checks whether current acknowledge(ment) signal intensity RSSI is less than initiatively handoff threshold T
b=80dB, if the acknowledge(ment) signal intensity RSSI of user terminal STA is less than initiatively handoff threshold T
b, execution step (6b), otherwise, user terminal STA proper communication;
6b) all neighboring access point AP of user terminal STA dynamic scan
b, and acknowledge(ment) signal intensity RSSI is greater than to initiatively handoff threshold T
bscanning result writing scan result table in, after the user terminal STA end of scan, this scanning result table is fed back to current access point AP
a;
6c) current access point AP
autilize the scanning result of each user terminal STA feedback, calculate signal strength signal intensity load value: RL
ij=RSSI
ij× f
i(l)
Wherein f
i(l)=exp (k
1× l)+k
2represent intermediate variable, l is candidate's access point AP
iload, k
1the weight that balance factor number 1 is used for adjusting load l, k
2that balance factor number 2 is used for adjusting acknowledge(ment) signal intensity RSSI
ijweight, acknowledge(ment) signal intensity RSSI
ijcandidate's access point AP
iwith candidate user terminal STA
jbetween signal quality quality metric;
6d) current access point AP
aby signal strength signal intensity load value RL
ijdescending sequence, forms signal strength signal intensity load list RL;
6e) current access point AP
afrom signal strength signal intensity load list RL, select to come foremost, and the candidate's access point AP not being selected
iwith candidate user terminal STA
j, and to candidate's access point AP
isend handover request and candidate user terminal STA
jload information, candidate's access point AP
ireceive current access point AP
athe handover request of sending and candidate user terminal STA
jload information after can check that present load adds candidate user terminal STA
jload whether overload, if do not overload candidate's access point AP
ito current access point AP
afeedback is switched confirmation;
6f) current access point AP
acheck and whether receive candidate's access point AP
ithe switching of sending is confirmed, if received, performs step (6g), otherwise execution step (6e);
6g) current access point AP
ato candidate user terminal STA
jsend handover information frame;
6h) candidate user terminal STA
jreceive current access point AP
ahandover information frame after, be switched to candidate's access point AP
i, complete initiatively and switch.
Compared with prior art, tool has the following advantages in the present invention:
1) changing method that active is switched and passive switching combines that the present invention proposes has solved one-sided startup switching problem, the gain that had both improved network side, the gain that has improved again user terminal STA side.
2) the dynamic scan technology in the present invention, by the channel that will scan is carried out to prioritization, is then carried out dynamic change to minimum channel time and maximum channel time, has both reduced handover delay, ensures again to being scanned into power.
Brief description of the drawings
Fig. 1 is general flow chart of the present invention;
Fig. 2 is the passive switching sub-process figure in the present invention;
Fig. 3 initiatively switches sub-process figure in the present invention;
Fig. 4 is the dynamic scan sub-process figure in the present invention.
Embodiment
With reference to Fig. 1, performing step of the present invention is as follows:
Step 1: current access point AP
awith neighboring access point AP
bregularly carry out information exchange, make current access point AP
aobtain neighboring access point AP
binformation, this information comprises neighboring access point AP
bworking channel number and load, wherein load is the ratio of current throughput and channel width.
Step 2: current access point AP
aby the neighboring access point AP obtaining
binformation, is handed down to and current access point AP by the mode of beacon frame
athe user terminal STA connecting, the mode of described beacon frame is the beacon frame beacon utilizing in 802.11 standards, increases neighboring access point AP in beacon frame beacon
binformation, then by neighboring access point AP
binformation sends to user terminal STA with beacon frame beacon.
Step 3: user terminal STA receives current access point AP
athe neighboring access point AP issuing
binformation after, check current received signal strength RSSI, this received signal strength RSSI is the metric of signal quality between user terminal STA and access point AP, if current received signal strength RSSI is less than passive handoff threshold T
a, execution step (4) starts passive switching, otherwise execution step (5) starts initiatively switching.
Step 4: user terminal STA is to current access point AP
asend passive handover request, start passive switching:
With reference to Fig. 2, being implemented as follows of this step:
4a) user terminal STA utilizes current access point AP
athe information issuing is determined scanning set, is about to appear at the neighboring access point AP in information
bchannel be defined as scanning set;
4b) channel in scanning set is carried out to dynamic scan
With reference to Fig. 4, being implemented as follows of dynamic scan:
4b1) user terminal STA calculates respectively each neighboring access point AP in own and scanning set
bdistance, according to distance determine channel priority, distance nearlyer priority higher;
4b2) user terminal STA selective channel from scanning set, is 1,6,11 these three channels if having channel number in scanning set, preferentially selects this three channels, otherwise, select the channel that priority is the highest and be not scanned;
4b3) user terminal STA is switched to the channel of selection, and on scanning channel, sends probe request Probe Request, the neighboring access point AP on scanning channel
bafter receiving probe request Probe Request, can feed back probing response frame Probe Response, the initial value of minimum channel time MinT and maximum channel time MaxT is respectively 10ms and 20ms;
4b4) user terminal STA is according to whether receiving that in minimum channel time MinT probing response frame Probe Response determines execution step, if user terminal STA receives probing response frame Probe Response in minimum channel time MinT, record received signal strength RSSI according to probing response frame Probe Response, and execution step (4b5), otherwise, execution step (4b6);
4b5) user terminal STA stops maximum channel time MaxT on scanning channel, within the time of staying, record each the probing response frame Probe Response receiving, the time of staying finishes the next channel of rear selection, and reduce the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (4b2) is to (4b4), until scanned all channels;
4b6) user terminal STA stops after minimum channel time MinT on scanning channel, select next channel, and increasing the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (4b2) is to (4b4), until scanned all channels;
4c) user terminal STA is according to acknowledge(ment) signal intensity RSSI, and from scanning result, selecting acknowledge(ment) signal intensity RSSI the maximum is that best access point AP switches, and completes passive switching.
Step 5, current access point AP
acheck whether self overloads, and check the passive handover request of whether receiving that user terminal STA sends, overload here refers to current access point AP
athroughput reach the more than 55% of bandwidth, if current access point AP
aoverload and do not receive the passive handover request that user terminal STA sends, current access point AP
astart initiatively and switch, execution step (6), otherwise, current access point AP
acirculation is checked oneself state and is upgraded neighboring access point AP
binformation.
Step 6, current access point AP
astart initiatively and switch, and to current access point AP
athe user terminal STA connecting issues initiatively switch frame.
With reference to Fig. 3, being implemented as follows of this step:
6a) receive that initiatively the user terminal STA of switch frame checks whether current acknowledge(ment) signal intensity RSSI is less than initiatively handoff threshold T
bif the acknowledge(ment) signal intensity RSSI of user terminal STA is less than initiatively handoff threshold T
b, user terminal STA utilizes current access point AP
athe information that issues determines that scanning gathers and perform step (6b), otherwise, user terminal STA proper communication;
6b) user terminal STA carries out dynamic scan to the channel in scanning set
With reference to Fig. 4, being implemented as follows of dynamic scan:
6b1) user terminal STA calculates respectively each neighboring access point AP in own and scanning set
bdistance, according to distance determine channel priority, distance nearlyer priority higher;
6b2) user terminal STA selective channel from scanning set, is 1,6,11 these three channels if having channel number in scanning set, preferentially selects this three channels, otherwise, select the channel that priority is the highest and be not scanned;
6b3) user terminal STA is switched to the channel of selection, and on scanning channel, sends probe request Probe Request, the neighboring access point AP on scanning channel
bafter receiving probe request Probe Request, can feed back probing response frame Probe Response, the initial value of minimum channel time MinT and maximum channel time MaxT is respectively 10ms and 20ms;
6b4) user terminal STA is according to whether receiving that in minimum channel time MinT probing response frame Probe Response determines execution step, if user terminal STA receives probing response frame Probe Response in minimum channel time MinT, record received signal strength RSSI according to probing response frame Probe Response, and execution step (6b5), otherwise, execution step (6b6);
6b5) user terminal STA stops maximum channel time MaxT on scanning channel, within the time of staying, record each the probing response frame Probe Response receiving, the time of staying finishes the next channel of rear selection, and reduce the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (6b2) is to (6b4), until scanned all channels;
6b6) user terminal STA stops after minimum channel time MinT on scanning channel, select next channel, and increasing the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (6b2) is to (6b4), until scanned all channels;
6c) user terminal STA has scanned all neighboring access point AP
bafter, acknowledge(ment) signal intensity RSSI is greater than to initiatively handoff threshold T
bscanning result writing scan result table in, this scanning result table is fed back to current access point AP by user terminal STA
a;
6d) current access point AP
autilize the scanning result of each user terminal STA feedback, calculate signal strength signal intensity load value: RL
ij=RSSI
ij× f
i(l),
Wherein f
i(l)=exp (k
1× l)+k
2represent intermediate variable, l is candidate's access point AP
iload, k
1the weight that balance factor number 1 is used for adjusting load l, k
2that balance factor number 2 is used for adjusting acknowledge(ment) signal intensity RSSI
ijweight, acknowledge(ment) signal intensity RSSI
ijcandidate's access point AP
iwith candidate user terminal STA
jbetween signal quality quality metric;
6e) current access point AP
aby signal strength signal intensity load value RL
ijdescending sequence, forms signal strength signal intensity load list RL;
6f) current access point AP
afrom signal strength signal intensity load list RL, select to come foremost, and the candidate's access point AP not being selected
iwith candidate user terminal STA
j, and to candidate's access point AP
isend handover request and candidate user terminal STA
jload information, candidate's access point AP
ireceive current access point AP
athe handover request of sending and candidate user terminal STA
jload information after, if candidate's access point AP
ipresent load add candidate user terminal STA
jload do not overload to current access point AP
afeedback is switched confirmation;
6g) current access point AP
acheck and whether receive candidate's access point AP
ithe switching of sending is confirmed, if received, performs step (6f), otherwise execution step (6h);
6h) current access point AP
ato candidate user terminal STA
jsend handover information frame;
6i) candidate user terminal STA
jreceive current access point AP
ahandover information frame after, be switched to candidate's access point AP
i, complete initiatively and switch.
Terminological interpretation
WLAN:Wireless Local Area Network; WLAN;
AP:Access Point; Access point;
STA:Station; User;
MinT:MinChannelTime: minimum channel time;
MaxT:MaxChannelTime: maximum channel time;
Probe Request: probe requests thereby;
Probe Response: probe response;
RSSI:Received Signal Strength Indication: acknowledge(ment) signal intensity instruction.
Claims (3)
1. the changing method of user terminal between access point in the WLAN based on AP cooperation, comprises the steps:
(1) current access point AP
awith neighboring access point AP
bregularly carry out information exchange, make current access point AP
aobtain neighboring access point AP
binformation, this information comprises neighboring access point AP
bworking channel number and load;
(2) current access point AP
aby the neighboring access point AP obtaining
binformation, is handed down to and current access point AP by the mode of beacon frame
athe user terminal STA connecting;
(3) user terminal STA receives current access point AP
athe neighboring access point AP issuing
binformation after, check current acknowledge(ment) signal intensity RSSI, if current RSSI is less than the passive handoff threshold T of setting
a, execution step (4) starts passive switching, otherwise execution step (5);
(4) user terminal STA is to current access point AP
asend passive handover request, start passive switching;
4a) user terminal STA utilizes current access point AP
athe information issuing is determined scanning set, is about to appear at the neighboring access point AP in information
bchannel be defined as scanning set;
4b) user terminal STA calculates respectively each neighboring access point AP in own and scanning set
bdistance, according to distance determine channel priority, distance nearlyer priority higher;
4c) user terminal STA selective channel from scanning set, is 1,6,11 these three channels if having channel number in scanning set, preferentially selects this three channels, otherwise, select the channel that priority is the highest and be not scanned;
4d) user terminal STA is switched to the channel of selection, and on scanning channel, sends probe request Probe Request, and the initial value of minimum channel time MinT and maximum channel time MaxT is respectively 10ms and 20ms;
4e) user terminal STA is according to whether receiving that in minimum channel time MinT probing response frame Probe Response determines execution step, if user terminal STA receives probing response frame Probe Response in minimum channel time MinT, perform step 4f) and 4h), otherwise, execution step 4g);
4f) user terminal STA stops after maximum channel time MaxT on scanning channel, select next channel, and reducing the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (4c) is to (4e), until scanned all channels;
4g) user terminal STA stops after minimum channel time MinT on scanning channel, select next channel, and increasing the each 5ms of value of minimum channel time MinT and maximum channel time MaxT, repeating step (4c) is to (4e), until scanned all channels;
4h) user terminal STA is according to acknowledge(ment) signal intensity RSSI, and from scanning result, selecting acknowledge(ment) signal intensity RSSI the maximum is that best access point AP switches, and completes passive switching;
(5) current access point AP
acheck whether self overloads, and check the passive handover request of whether receiving that user terminal STA sends, if current access point AP
aoverload and do not receive the passive handover request that user terminal STA sends, current access point AP
astart initiatively and switch, execution step (6), otherwise, current access point AP
aoneself state is checked in circulation;
(6) current access point AP
astart initiatively and switch, and to current access point AP
athe user terminal STA connecting issues initiatively switch frame.
2. according to the described changing method of claim 1, what wherein step (2) was described passes through photos and sending messages under beacon frame mode, refers to the beacon frame beacon in 802.11 standards, increases neighboring access point AP in beacon frame beacon
binformation, then by neighboring access point AP
binformation sends to user terminal STA with beacon frame beacon.
3. changing method according to claim 1, the active in wherein said step (6) is switched, and comprises the steps:
6a) receive that initiatively the user terminal STA of switch frame checks whether current acknowledge(ment) signal intensity RSSI is less than initiatively handoff threshold T
bif the acknowledge(ment) signal intensity RSSI of user terminal STA is less than initiatively handoff threshold T
b, execution step (6b), otherwise, user terminal STA proper communication;
6b) user terminal STA utilizes dynamic scan to scan all neighboring access point AP
bafter, and acknowledge(ment) signal intensity RSSI is greater than to initiatively handoff threshold T
bscanning result writing scan result table in, this scanning result table is fed back to current access point AP by user terminal STA
a;
6c) current access point AP
autilize the scanning result of each user terminal STA feedback, calculate signal strength signal intensity load value: RL
ij=RSSI
ij× f
i(l)
Wherein f
i(l)=exp (k
1× l)+k
2represent intermediate variable, l is candidate's access point AP
iload, k
1the weight that balance factor number 1 is used for adjusting load l, k
2that balance factor number 2 is used for adjusting acknowledge(ment) signal intensity RSSI
ijweight, acknowledge(ment) signal intensity RSSI
ijcandidate's access point AP
iwith candidate user terminal STA
jbetween signal quality quality metric;
6d) current access point AP
aby signal strength signal intensity load value RL
ijdescending sequence, forms signal strength signal intensity load list RL;
6e) current access point AP
afrom signal strength signal intensity load list RL, select to come foremost, and the candidate's access point AP not being selected
iwith candidate user terminal STA
j, and to candidate's access point AP
isend handover request and candidate user terminal STA
jload information, candidate's access point AP
ireceive current access point AP
athe handover request of sending and candidate user terminal STA
jload information after can check that present load adds candidate user terminal STA
jload whether overload, if do not overload candidate's access point AP
ito current access point AP
afeedback is switched confirmation;
6f) current access point AP
acheck and whether receive candidate's access point AP
ithe switching of sending is confirmed, if received, performs step (6g), otherwise execution step (6e);
6g) current access point AP
ato candidate user terminal STA
jsend handover information frame;
6h) candidate user terminal STA
jreceive current access point AP
ahandover information frame after, be switched to candidate's access point AP
i, complete initiatively and switch.
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| CN103167586B (en) * | 2013-03-01 | 2015-08-12 | 北京傲天动联技术股份有限公司 | A kind of access of the wireless terminal based on AP cluster and reselecting method |
| CN104168662B (en) * | 2013-05-16 | 2018-07-20 | 华为技术有限公司 | Channel access method and access device |
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| CN101141782B (en) * | 2006-09-07 | 2012-08-29 | 日电（中国）有限公司 | Access point auxiliary fast handover method, equipment and system |
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| CN101521924A (en) * | 2009-04-27 | 2009-09-02 | 杭州华三通信技术有限公司 | Switching method and device of wireless local area network |
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