CN102149136B - Method and system for switching channel of access point and access point - Google Patents
Method and system for switching channel of access point and access point Download PDFInfo
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Abstract
The invention provides a method and system for switching a channel of an access point (AP) and an access point AP, wherein the method comprises the following steps: the AP increases a load value of the AP announced in a wireless local area network to be a preset high load value while determining that channel is required to be switched, wherein the high load value assures that the AP satisfies a load balancing condition; the AP forces the current STA (Mobile Terminal) accessed into the AP to go offline while a preset time length is reached or the number of mobile terminals (STA) accessed into the AP is lower than a preset number threshold; and the AP switches the channel after all STAs accessed into the AP are offline. The invention greatly reduces the situation of long-time service interruption of the STAs in the channel switching process of the AP by combining the AP channel switching with load balancing.
Description
Technical field
The present invention relates to wireless network communication technique, particularly a kind of method, system and access point of channel of access point switching.
Background technology
For WLAN (wireless local area network), channel is very rare resource, and each access point (AP) only can be operated on the limited channel into its distribution.Because there are a large amount of possible interference sources in the WLAN (wireless local area network) working frequency range, as radar, microwave etc., they can guarantee that by the channel adjustment to AP each AP is operated on optimum channel by the normal operation of interfering AP, only reduce possibly and avoid adjacent-channel interference.
Before carrying out the channel switching, AP need the mobile terminal (STA) that will access this AP to transfer on neighbor AP.For this problem, mainly there are two kinds of modes in prior art:
First kind of way: AP, before carrying out the channel switching, forces STA all on former channel to catch up with to roll off the production line, and after waiting all STA all to roll off the production line, AP carries out the channel switching.
The second way: AP is before carrying out the channel switching, and all STA of channel switching message notifying of all STA transmissions on former channel are about to start the channel switching, then force all STA to roll off the production line, and after waiting all STA all to roll off the production line, AP carries out the channel switching.
Above-mentioned two kinds of modes all adopt the mode of forcing STA to roll off the production line, too simple and crude, after the STA on former channel is caught up with and rolls off the production line, may can not find accessible neighbor AP, thereby cause long service disconnection.
Summary of the invention
In view of this, the invention provides a kind of method, system and AP of AP channel switching, so that reduced the situation of the long-time service disconnection of STA in the AP channel switching process.
A kind of method of AP channel switching, the method comprises:
AP determines that in the time of need to carrying out the channel switching, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value, and wherein, this high capacity value guarantees that described AP meets the load balancing condition;
In the STA quantity that reaches default duration or access described AP, during lower than the predetermined number threshold value, described AP forces the STA of the described AP of current access to roll off the production line;
After all STA of the described AP of access roll off the production line, AP carries out the channel switching.
A kind of AP, this AP comprises: adjustment of load unit, force to roll off the production line unit and channel switch unit;
Described adjustment of load unit, in the time of need to carrying out the channel switching for determining at this AP, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value, and wherein, this high capacity value guarantees that described AP meets the load balancing condition;
The described pressure unit that rolls off the production line, when determining at this AP after need to carrying out the channel switching that the STA quantity that reaches default duration or access this AP is lower than the predetermined number threshold value, force the STA of current this AP of access to roll off the production line;
Described channel switch unit, after all rolling off the production line for all STA at this AP of access, carry out the channel switching.
A kind of system of AP channel switching, this system comprises AC and above-mentioned AP;
Described AC, for when definite described AP meets the load balancing condition, notify described AP to refuse new STA access and the STA that accesses described AP and can access neighbor AP forced to roll off the production line.
As can be seen from the above technical solutions, the load-balancing technique of the present invention in AP carries out when channel switches combining WLAN (wireless local area network), rise to default high capacity value by the load value by the AP announcement, make this AP meet the load balancing condition, and this load balancing process is continued for some time., force the upper remaining STA of AP to roll off the production line, thereby carry out the channel switching during lower than the predetermined number threshold value in the STA quantity that reaches default duration or access AP.Mobility due to STA, in the load balancing process continued for some time, increased the possibility of STA access neighbor AP, the STA that makes it possible to access neighbor AP can access rapidly neighbor AP after being forced to roll off the production line, and has greatly reduced the situation of the long-time service disconnection of STA in the AP channel switching process.
The accompanying drawing explanation
The WLAN (wireless local area network) schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The method flow diagram that Fig. 2 provides for the embodiment of the present invention;
The structural representation that Fig. 3 is AP provided by the invention;
Another structural representation that Fig. 4 is AP provided by the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, describe the present invention.
Can not find accessible neighbor AP after avoiding STA to be forced to roll off the production line as far as possible, load-balancing technique in inventor's combining wireless local area network (LAN) is realized the channel switching of AP, method provided by the invention mainly comprises: AP determines in the time of need to carrying out the channel switching, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value, and this default high capacity value guarantees that this AP meets the load balancing condition; In the STA quantity that reaches default duration or access this AP, during lower than the predetermined number threshold value, this AP forces the STA of current this AP of access to roll off the production line; AP carries out the channel switching.
In order to facilitate the understanding of the present invention, at first load-balancing technique of the prior art is simply introduced.For user and flow on balanced each AP, AP can collect neighbor information and be reported to AC, and the situation that AC reports according to each AP is divided into the load balancing group by adjacent a plurality of AP.When the AP in a load balancing group meets the load balancing condition, start to carry out load balancing, load balancing condition commonly used is: when the load that accesses certain AP reaches the load balancing threshold value, and when the load of this AP reaches default difference threshold higher than the value of the load of another AP, AC notifies this AP to start to refuse new STA access, and the STA that accesses this AP and can access neighbor AP is forced to roll off the production line, thereby make the STA that forces to roll off the production line can be switched to neighbor AP, get on.Because load-balancing technique is based on the condition that there is neighbor AP, therefore, can both be switched to smoothly neighbor AP after each STA is forced to roll off the production line gets on, can find out, if use load-balancing technique, can reduce the duration of STA service disconnection, even perception is less than the flow interrupt of business.
Below enumerating a specific embodiment is described in detail said method, take the network architecture shown in Fig. 1 as example, suppose that AP1, AP2 and AP3 belong to a load balancing group, the current access of STA2, STA3 and STA4 AP3, and STA2 and STA3 are simultaneously in the coverage of AP2.The process that AP3 carries out the channel switching can as shown in Figure 2, comprise the following steps:
Step 201:AP determines that in the time of need to carrying out channel adjustment, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value.
In order to reduce the channel disturbance between cochannel AP, it is upper that the information that AP will receive separately passes to AC, after receiving information on AC, makes the channel adjustment strategy, and notify the AP that need to carry out channel adjustment to carry out channel adjustment.After AP receives the notice of carrying out channel adjustment from AC, determine and need to carry out channel adjustment.
AP is the load value of announcement self in WLAN (wireless local area network) periodically, when AP determines while need to carry out channel adjustment, the load value of announcement is risen to default high capacity value, this default high capacity value can be the maximum load value of AP, can be also other default value, as long as can trigger the load balancing of this AP.
In this step, the in fact virtual load value that has improved oneself of AP, making the load value of this AP that AC in WLAN (wireless local area network) and STA know is the high capacity value after improving.
Step 202:AC determines that this AP3 meets the load balancing condition after getting the high capacity value of AP3 announcement, and AC notice AP3 forces the STA2 and the STA3 that access this AP3 and can access neighbor AP to roll off the production line.
At this, may there be following two kinds of situations in the high capacity value that AC obtains the AP3 announcement:
When the first situation: AC need to carry out the channel switching at definite AP3, except notice, AP3 carries out the channel switching, also default high capacity value can be sent to AP3, and think that the load value of AP3 is this high capacity value, thereby determine that this AP3 meets the load balancing condition.In this case, AP3 is announced according to the high capacity value of AC notice.
When the second situation: AC need to carry out the channel switching at definite AP3, only notify AP3 to carry out the channel switching.AP3, after carrying out the channel switching, automatically brings up to default high capacity value by the load value of announcement, and this high capacity value is sent to AC.AC determines that AP3 meets the load balancing condition after obtaining the high capacity value of AP3 transmission.
In addition, AC can be known the positional information of each STA, and in framework as shown in Figure 1, AC determines in the STA of current access AP3, and STA2 and STA3 can switch to neighbor AP 2, and therefore, notice AP3 refuses new STA access, and STA2 and STA3 are forced to roll off the production line.STA2 and STA3, after being forced to roll off the production line, if there is accessible neighbor AP, select one of them neighbor AP access according to the load state of neighbor AP.Be STA2 and STA3 after being forced to roll off the production line by AP3, can again access rapidly AP2, the assurance business is not interrupted for a long time.
In addition, the performance number of announcing self due to AP3 is high power value, therefore, as new STA, when selecting access AP, if can access other AP simultaneously, can not select the AP3 access.
AP3 can be by going the mode of authentication (Deauthentication) message to force STA2 and STA3 to roll off the production line to STA2 and STA3 transmission.
Step 203: in the STA quantity that reaches default duration or access this AP3, during lower than default amount threshold, AP3 forces the STA4 of current this AP3 of access to roll off the production line.
After the load balancing continued for some time, due to the mobility of STA, once moving to the coverage of neighbor AP, STA can be linked on neighbor AP, and AC will notify AP to force this STA to roll off the production line, and guarantees that this STA can access rapidly neighbor AP.Obviously, in the prior art of comparing, all STA are forced to roll off the production line simultaneously, greatly improved the success rate of STA access neighbor AP.For example, if during default duration does not have arrival, STA4 has moved in the scope of AP2 covering, and AC notice AP3 forces this STA4 to roll off the production line, and this STA4 can access rapidly AP2 again.
But, may exist some STA not move to all the time the coverage of neighbor AP, AP can not wait for without end, AP can during lower than default amount threshold, force the STA of current this AP of access to roll off the production line in the STA quantity of determining after needing switching channels the duration that reaches default or current access AP in the present embodiment.When if the STA4 in Fig. 1 arrives at default duration, still do not have neighbor AP accessible, AP3 forces this STA4 to roll off the production line.
Step 204: after all STA roll off the production line, AP3 carries out the channel switching.
Step 205: after channel has switched, AP3 can announce the actual loading value of this AP3 in WLAN (wireless local area network).
After having switched, because current AP3 does not have the STA access, so its load value is minimum.Now, the STA in the AP3 coverage can be accessed by the preferential AP3 of selection when selecting AP to be accessed.For example, STA4, due to after being forced to roll off the production line by AP3, does not have accessible neighbor AP, waits for that AP3 completes channel and switches while starting to receive new STA access, again accesses AP3.If now other AP meets the load balancing condition, if in the STA that is forced to roll off the production line in the coverage of AP3, also can select AP3 again to access.
Be more than the detailed description that method provided by the present invention is carried out, below system provided by the present invention and AP be described in detail.System provided by the present invention comprises: AC and AP.
Wherein, AP, in the time of need to carrying out the channel switching for determining, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value, and this high capacity value guarantees that this AP meets the load balancing condition; In the STA quantity that reaches default duration or access this AP, during lower than the predetermined number threshold value, force the STA of current access to roll off the production line; After all STA of this AP of access roll off the production line, carry out the channel switching.
AC, the AP that meets the load balancing condition for notice refuses new STA access and the STA that accesses this AP and can access neighbor AP is forced to roll off the production line.
In addition, above-mentioned AC can also notify described AP to carry out the channel switching, and default high capacity value is sent to AP when definite AP need to carry out the channel switching, determines that this AP meets the load balancing condition.
After AP receives the notice of AC, determine and need to carry out the channel switching, and the load value of this AP of announcing in WLAN (wireless local area network) is risen to default high capacity value.
Perhaps, when AP need to carry out the channel switching at definite AP, notice AP carries out the channel switching; While getting the high capacity value of AP notice, determine that this AP meets the load balancing condition.
After AP receives the notice of AC, determine and need to carry out the channel switching, and the high capacity value of announcement is notified to AC.
The structural representation that Fig. 3 is AP provided by the invention, as shown in Figure 3, this AP comprises: adjustment of load unit 301, force to roll off the production line unit 302 and channel switch unit 303.
Adjustment of load unit 301, in the time of need to carrying out the channel switching for determining at this AP, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value, and wherein, this high capacity value guarantees that AP meets the load balancing condition.
The pressure unit 302 that rolls off the production line, when determining at this AP after need to carrying out the channel switching that the STA quantity that reaches default duration or access this AP is lower than the predetermined number threshold value, force the STA of current this AP of access to roll off the production line.
In addition, this AP can also comprise: Load Balance Unit 304, for when this AP meets the load balancing condition, according to the notice of AC in WLAN (wireless local area network), refuse new STA access, and force the STA that accesses this AP and can access neighbor AP to roll off the production line in the notice unit 302 of forcing to roll off the production line.
Wherein, above-mentioned load balancing condition can be: the load value of this AP reaches the load balancing threshold value, and the load value of this AP at least exceeds default difference threshold than the load value of another AP in same load balancing group.
Further, adjustment of load unit 301, can also be for after completing the channel switching at channel switch unit 303, the actual loading value of this AP of announcement in WLAN (wireless local area network).
In addition, this AP can also comprise: load acquiring unit 305, the default high capacity value sent for obtaining AC.
Adjustment of load unit 301, for the high capacity value of obtaining according to load acquiring unit 305, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value.
Perhaps, adopt another structure, as shown in Figure 4, this AP can also comprise: load transmitting element 405, send to the AC of WLAN (wireless local area network) for the high capacity value that adjustment of load unit 301 is improved, and determine that for AC this AP meets the load balancing condition.
By above description, can be found out, method provided by the present invention, system and AP have the following advantages:
1) load-balancing technique of the present invention in AP carries out when channel switches combining WLAN (wireless local area network), rise to default high capacity value by the load value by the AP announcement, makes this AP meet the load balancing condition, and this load balancing process is continued for some time., force the upper remaining STA of AP to roll off the production line, thereby carry out the channel switching during lower than the predetermined number threshold value in the STA quantity that reaches default duration or access AP.Mobility due to STA, in the load balancing process continued for some time, increased the possibility of STA access neighbor AP, the STA that makes it possible to access neighbor AP can access rapidly neighbor AP after being forced to roll off the production line, and has greatly reduced the situation of the long-time service disconnection of STA in the AP channel switching process.
2) the present invention does not carry out any change to STA, in the channel switching process of AP, STA is carried out to smooth migration, at STA, holds the generation of even perception less than the switching of AP channel.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (9)
1. the method for an access point AP channel switching, is characterized in that, the method comprises:
AP determines that in the time of need to carrying out the channel switching, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value to trigger the load balancing of described AP, and wherein, this high capacity value guarantees that described AP meets the load balancing condition;
The STA quantity that reaches default duration or access described AP in the duration of load balancing is during lower than the predetermined number threshold value, and described AP forces the STA of the described AP of current access to roll off the production line;
After all STA of the described AP of access roll off the production line, AP carries out the channel switching;
Wherein, the AC in described WLAN (wireless local area network) determines when described AP need to carry out the channel switching, notifies described AP to carry out the channel switching, and described default high capacity value is sent to described AP, determines that described AP meets the load balancing condition; After described AP receives the notice of AC, determine and need to carry out the channel switching, and the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value;
Perhaps, the AC in described WLAN (wireless local area network) determines when described AP need to carry out the channel switching, notifies described AP to carry out the channel switching; After described AP receives the notice of AC, determine and need to carry out the channel switching, and the described high capacity value of announcement is notified to described AC; When AC gets the described high capacity value of AP notice, determine that described AP meets the load balancing condition.
2. method according to claim 1, it is characterized in that, when described AP meets the load balancing condition, according to the notice of access controller AC in described WLAN (wireless local area network), refuse new STA access, and the STA that accesses described AP and can access neighbor AP is forced to roll off the production line.
3. method according to claim 1, is characterized in that, after described AP completes the channel switching, described AP announces the actual loading value of described AP in WLAN (wireless local area network).
4. an AP, is characterized in that, this AP comprises: adjustment of load unit, force to roll off the production line unit and channel switch unit;
Described adjustment of load unit, in the time of need to carrying out the channel switching for determining at this AP, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value to trigger the load balancing of described AP, and wherein, this high capacity value guarantees that described AP meets the load balancing condition;
The described pressure unit that rolls off the production line, for after determining at this AP and need to carrying out the channel switching, the STA quantity that reaches default duration or access this AP in the duration of load balancing during lower than the predetermined number threshold value, forces the STA of current this AP of access to roll off the production line;
Described channel switch unit, after all rolling off the production line for all STA at this AP of access, carry out the channel switching;
Wherein, the AC in described WLAN (wireless local area network) determines when described AP need to carry out the channel switching, notifies described AP to carry out the channel switching, and described default high capacity value is sent to described AP, determines that described AP meets the load balancing condition; After described AP receives the notice of AC, determine and need to carry out the channel switching, and the load value of this AP that will be announced in WLAN (wireless local area network) by described adjustment of load unit rises to default high capacity value;
Perhaps, the AC in described WLAN (wireless local area network) determines when described AP need to carry out the channel switching, notifies described AP to carry out the channel switching; After described AP receives the notice of AC, determine and need to carry out the channel switching, and by described adjustment of load unit, the described high capacity value of announcement is notified to described AC; When AC gets the described high capacity value of AP notice, determine that described AP meets the load balancing condition.
5. AP according to claim 4, it is characterized in that, this AP also comprises: Load Balance Unit, for when this AP meets the load balancing condition, notice according to AC in described WLAN (wireless local area network), refuse new STA access, and the STA that accesses this AP and can access neighbor AP is forced to roll off the production line.
6. according to the described AP of claim 4 or 5, it is characterized in that, described adjustment of load unit, also for complete the channel switching at described channel switch unit after, the actual loading value of this AP of announcement in WLAN (wireless local area network).
7. according to the described AP of claim 4 or 5, it is characterized in that, this AP also comprises: load acquiring unit, the described default high capacity value sent for obtaining AC;
Described adjustment of load unit, for the described high capacity value of obtaining according to described load acquiring unit, the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value.
8. according to the described AP of claim 4 or 5, it is characterized in that, this AP also comprises: the load transmitting element, send to the AC of described WLAN (wireless local area network) for the described high capacity value that described adjustment of load unit is improved, and determine that for described AC this AP meets the load balancing condition.
9. the system of an AP channel switching, is characterized in that, this system comprises AC and AP as claimed in claim 5;
Described AC, for when definite described AP meets the load balancing condition, notify described AP to refuse new STA access and the STA that accesses described AP and can access neighbor AP forced to roll off the production line; In the time of also for definite described AP, need to carrying out the channel switching, notify described AP to carry out the channel switching, described default high capacity value is sent to described AP, determine that described AP meets the load balancing condition, so that after described AP receives the notice of AC, definite needs carry out the channel switching, and the load value of this AP that will announce in WLAN (wireless local area network) rises to default high capacity value; Perhaps, in the time of also for definite described AP, need to carrying out the channel switching, notify described AP to carry out the channel switching, when getting the high capacity value of AP notice, determine that described AP meets the load balancing condition, wherein, after described AP receives the notice of AC, definite needs carry out the channel switching, and the described high capacity value of announcement is notified to described AC.
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| CN102404794A (en) * | 2011-11-28 | 2012-04-04 | 福建星网锐捷网络有限公司 | Method, equipment and network for load balancing based on frequency band in wireless local area network |
| CN103384392B (en) * | 2012-05-04 | 2016-06-15 | 中兴通讯股份有限公司 | A kind of mobile terminal accesses method and the WAP of WAP |
| CN102724695A (en) * | 2012-06-28 | 2012-10-10 | 福建星网锐捷网络有限公司 | Wireless controller heat backup switching method, wireless controller heat backup switching device and wireless controller |
| CN104053184A (en) * | 2014-06-23 | 2014-09-17 | 福建三元达通讯股份有限公司 | Wireless load balancing method, wireless controller, wireless access point and system |
| CN107317764B (en) * | 2016-04-26 | 2021-12-14 | 北京京东尚科信息技术有限公司 | Traffic load balancing method, system, device and computer readable storage medium |
| CN107613538A (en) * | 2016-07-12 | 2018-01-19 | 中兴通讯股份有限公司 | A kind of wireless network access method, equipment, terminal and system |
| CN110582099A (en) * | 2019-09-17 | 2019-12-17 | 江苏省未来网络创新研究院 | System and method for realizing AP load balance in WiFi environment |
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| US7162250B2 (en) * | 2003-05-16 | 2007-01-09 | International Business Machines Corporation | Method and apparatus for load sharing in wireless access networks based on dynamic transmission power adjustment of access points |
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| CN1759629A (en) * | 2003-01-10 | 2006-04-12 | 日本电气株式会社 | Content distribution system, network and channel method for handover control |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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| CP03 | Change of name, title or address |