CN100499551C - Method for controlling frequent switching in wireless local area network - Google Patents
Method for controlling frequent switching in wireless local area network Download PDFInfo
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- CN100499551C CN100499551C CNB2006100865562A CN200610086556A CN100499551C CN 100499551 C CN100499551 C CN 100499551C CN B2006100865562 A CNB2006100865562 A CN B2006100865562A CN 200610086556 A CN200610086556 A CN 200610086556A CN 100499551 C CN100499551 C CN 100499551C
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Abstract
Said wireless local area network (WLAN) at least comprises an access point (AP) and a terminal. The method comprises: a) setting the initial switch policy for said terminal and /or WLAN; b) said AP gets the initial state information of said terminal, and according to current switch state information, decides if the terminal is at a frequency switch state; if yes, said terminal and/or AP adopts a frequent switch avoiding policy, and executes step c; otherwise, keeps making decision; c) after sending a switch request to the terminal, the AP makes the switch control for the terminal according to the frequency switch avoiding policy in order to permit or reject the switch of the terminal.
Description
Technical field
The present invention relates to the wireless local area network (WLAN) system in the communications field, relate in particular to the control method of switching in the WLAN (wireless local area network).
Background technology
WLAN (WLAN (wireless local area network)) is meant that the employing wireless communication technology is interconnected with computer equipment, and formation can the mutual communication and the network system that realizes resource-sharing.In the wlan network environment, an extended service set is by one or more Basic Service Sets, and the compartment system formation that connects these Basic Service Sets, and each Basic Service Set comprises a wireless access point device.Extended service set is distinguished by ESSID (extended service set identifier), and WAP (wireless access point) is distinguished by BSSID (Basic Service Set identifier).Terminal is obtained extended service set and Basic Service Set information in the WLAN environment of living in by scanning channel, and selects to add a suitable Basic Service Set.
802.11 the physical layer that standard is an IEEE802.11 WLAN standard working group to be formulated and media interviews control (MAC) consensus standard are convenient to WLAN (wireless local area network) and radio equipment manufacturer and are set up mutual operation network equipment.Physical layer has defined the signal characteristic and the modulation of transfer of data.Media interviews controls (MAC) layer can be considered by a series of finishing such as the service of information exchange, power control, associate management, management by synchronization and process management to be formed.
Terminal with access point set up connect after, check whether have the better access point of signal quality to exist by scanning channel, if there is such access point to exist, terminal can be set up and the connecting of new access point by the process that reconnects, and the connecting of cut-out and old access point, this process is called switching.
Terminal is concentrated and can be roamed in expansion service, switches to another WAP (wireless access point) by a WAP (wireless access point).Switch and to be controlled because of terminal moves the roaming that produces normally.
The condition that present protocol of wireless local area network does not have prescribed terminal to switch, the general method of the switch window that relies on the detected signal strength signal intensity of terminal that adopts realizes, promptly just switches during than the high default switch window value of old access point signals quality when the signal quality of the new access point of terminal discovery.The terminal that is in the common overlay area of a plurality of WAP (wireless access point) can be because the variation of wireless network environment and move and produce repeatedly and switch.The switching of this terminal high frequency time between the close WAP (wireless access point) of two or more signal qualitys is called frequent switching, or is referred to as " ping-pong ".
Rally causes tremendous influence to expansion service in frequent switching:
1, frequently switches the concussion that brings offered load.Be in the terminal of frequent switching, it loads between the WAP (wireless access point) and transmits in the process of switching.Destroy the stationarity of extended service set.
2, the frequent switching impacts terminal traffic.Because handoff procedure must be through the association of separating between new and old two WAP (wireless access point), the series of fortified passes connection, process such as synchronous, simultaneously with also need to upgrade two layers of information such as route after new WAP (wireless access point) is connected.Data are to lose because of overtime in switching time, and the business on the terminal also can be intermittent.
3, wireless network method of adjustment such as load balancing may cause frequent switching.
Do not have complete frequent hand-off process strategy in the commercial product at present, following restrictions only arranged in avoiding the frequent received signal intensity window that switches:
1, the setting of window is a fixed size.The selection of the sizes values of window is to avoid the frequent key of switching.If it is excessive that window value is selected, after the terminal links that then can force to move is worse off, just can be connected on the new WAP (wireless access point).If it is too small that window is selected, can lose control to frequent switching, can not prevent frequent switching.And along with the variation of wireless network environment, the very possible instantaneous received signal intensity difference that window size occurs exceeding is should not produce switching in this case.
2, the state and the environment of terminal do not considered in the setting of window, do not have specific aim.
Summary of the invention
Technical problem solved by the invention provides the frequent control method of switching in a kind of WLAN (wireless local area network), can avoid frequent continuing of switching in conjunction with the state of terminal as far as possible.
In order to solve the problems of the technologies described above, the invention provides the frequent control method of switching in a kind of WLAN (wireless local area network), described radio local network environment comprises two WAP (wireless access point) and a terminal at least, and described WAP (wireless access point) is formed extended service set, may further comprise the steps:
(a) the initial switchover policy of setting terminal and/or WAP (wireless access point);
(b) WAP (wireless access point) is obtained the switching state information of terminal, described switching state information comprises wireless access dot information that terminal writes down and the information of connect hours length on each WAP (wireless access point) in continuous handoff procedure, judge according to the current switching state information of terminal whether terminal is in frequent switching state, if, then the switchover policy at this terminal on terminal and/or the WAP (wireless access point) is updated to the frequent switching avoidance strategy that restriction is switched, execution in step (c), otherwise continue to judge;
(c) handoff request that terminal is proposed, WAP (wireless access point) is carried out switching controls according to the frequent switching condition that switches in the avoidance strategy to this terminal, allows or refuse this terminal to switch.
Further, said method also can have following characteristics: in the described step (b), the terminal switching state information that described WAP (wireless access point) is obtained is to be reported by the WAP (wireless access point) of terminal to current connection, or is write down and the WAP (wireless access point) of WAP (wireless access point) after switching before switching transmit by the WAP (wireless access point) that terminal connects.
Further, said method also can have following characteristics: in the described step (c), the WAP (wireless access point) of the current connection of described terminal continues the connect hours of the described terminal of monitoring, if should the connect hours greater than the thresholding that is provided with, think that then this terminal is in stable connection status, switchover policy at this terminal on terminal and/or the WAP (wireless access point) is reverted to initial switchover policy, return step (b).
Further, said method also can have following characteristics: described switching state information comprises wireless access dot information that terminal writes down and the information of connect hours length on each WAP (wireless access point) in continuous handoff procedure.
Further, said method also can have following characteristics: the condition that the middle judgement of described step (b) terminal is in frequent switching state is the part or all of of following condition: terminal is in continuous handoff procedure, if the connect hours sum on each WAP (wireless access point) thinks then that greater than default maximum connect hours thresholding this terminal is in frequent switching state; Terminal if switch back and forth, thinks that then this terminal is in frequent switching state between several WAP (wireless access point) in continuous handoff procedure.
Further, said method also can have following characteristics: described initial switchover policy and the frequent avoidance strategy that switches comprise following part or all of switching condition: start the signal strength threshold condition of switching, start the load level conditions of switching, start the error rate condition of switching, start the power controlled condition of switching and start the channel quality conditions of switching.
Further, said method also can have following characteristics: condition and parameter limit thereof that switching condition that is provided with in the described frequent switching avoidance strategy and parameter thereof are compared initial switchover policy are more strict.
Further, said method also can have following characteristics: in the frequent switching avoidance strategy of described WAP (wireless access point) at described terminal, no longer allow the terminal that has been in frequent switching go to finish the switching decision of network side.
Further, said method also can have following characteristics: switch in the avoidance strategy frequent: WAP (wireless access point) is started the load level of switching heighten, make and also do not judge and will switch when the load level reaches thresholding in the initial switchover policy; The signal strength threshold condition of this connection that starting terminal is switched is turned down, make when the signal strength signal intensity of this connection is reduced to thresholding in the initial switchover policy, wouldn't switch, when having only the signal strength threshold that further is reduced in the frequent switching avoidance strategy, restart switching.
Further, said method also can have following characteristics: in the described step (c), WAP (wireless access point) allows described terminal to switch as described, and after this terminal switching was finished, also the switchover policy of this terminal was set to initial switchover policy.
Further, said method also can have following characteristics: also set the initial switchover policy of extended service set in the described step (a), in the described step (b), also the switchover policy that extended service set is adopted is updated to frequent switching avoidance strategy.
The method that the present invention proposes, measurement report and handover request information by terminal is submitted to are realized the judgement of the frequent switching state of terminal by network side.To the setting that the terminal of confirming to be in frequent switching state is frequently switched avoidance strategy, avoid frequent switching as far as possible.For starting frequent handover request of switching the terminal of avoidance strategy, the switching behavior of terminal is judged and determined to network side according to the condition of terminal handover request.
This method has following advantage:
1, distinguishes frequent the switching and normal the switching.For normal switching, system does not take control or avoids measure.When by after assert that terminal is in frequent switching state after to the detection of terminal switching state, take frequently to switch avoidance strategy, more the condition of new terminal and network side HDOP (frequently switching avoidance strategy) applies for switching with the terminal of avoiding being under the frequent switching state once more.Distinguish frequent switching and normal the switching, can protect the normal switching behavior of terminal when moving and roam.
2, solve frequent the switching step by step step by step, avoid system being caused negative effect because of handling frequent switching.Taking frequent the switching in the process of avoiding, differentiating and processing is carried out in the handover request of terminal, rather than refuse the switching of terminal fully.
3, upgrade the switchover policy HDOP of end side and network side synchronously, and in switchover policy, add load information, power control information etc. and network side and switch relevant information, can reduce the switching of the terminal that causes because of the network side managerial demand, from both direction, the switching behavior of terminal be controlled.
Description of drawings
Fig. 1 is the structural representation of WLAN (wireless local area network) extended service set;
Fig. 2 is the schematic diagram of the embodiment of the invention;
Fig. 3 is the flow chart of the embodiment of the invention.
Embodiment
The described radio local network environment of present embodiment comprises two WAP (wireless access point) and a terminal at least.These WAP (wireless access point) are formed an extended service set, for terminal provides access service.Below in conjunction with the drawings and specific embodiments the present invention is described in further details.
Referring to Fig. 2 and Fig. 3, the frequent control method of switching of present embodiment comprises the following steps:
Initial switchover policy can be set by WAP (wireless access point) on the terminal, also can select initial by terminal oneself.This initial switchover policy can be identical with the switchover policy before 802.11 standard mesh, can comprise following switching condition: start the signal strength threshold condition of switching, start the load level conditions of switching, start the error rate condition of switching, start power controlled condition or the channel quality conditions switched, or the combination of above condition, also can be set to other and start the condition of switching.
The signal strength information of other WAP (wireless access point) that above-mentioned measurement report exists, also comprise wireless access dot information and the connect hours information of terminal on WAP (wireless access point) that terminal connects in the WAP (wireless access point) that comprises the current connection that terminal measures and network.Except the handover request information of terminal, also to comprise the wireless access dot information and the connect hours information thereof of connection in the above-mentioned handover request.Certainly, except by these two message, do not get rid of terminal yet and adopt special switching state notification message to report its current switching state information, as for being provided with as required the opportunity that reports to WAP (wireless access point).
Wireless access dot information that connects and connect hours information thereof are meant wireless access dot information that terminal writes down and the information of connect hours length on each WAP (wireless access point) in handoff procedure continuously.So-called handoff procedure continuously refer to terminal in this process the connect hours on different WAP (wireless access point) all less than stablizing the connect hours thresholding.
The switching state information of terminal can be given WAP (wireless access point) by terminal to report, also can collect by WAP (wireless access point), and be by the WAP (wireless access point) record in a word.
Adoptable a kind of Rule of judgment can be: terminal is in continuous handoff procedure, if the connect hours sum on each WAP (wireless access point) thinks then that greater than default maximum connect hours thresholding this terminal is in frequent switching state;
Adoptable another kind of Rule of judgment can be: terminal is just thought frequent switching has taken place if switch back and forth between several WAP (wireless access point) in continuous switching.For example, terminal and a WAP (wireless access point) separate related after, in setting-up time or continuously, switch back to this WAP (wireless access point) again in the handoff procedure.
More than two conditions promptly can adopt separately, promptly satisfy arbitrary condition and just think frequent switching has taken place; Also can when first condition does not satisfy, judge second condition again, satisfy as second condition and then think frequent switching has taken place.Or the like, can certainly adopt other Rule of judgment.
Because except the switching that factors such as the environment of terminal and professional variations are brought, also have the reason of a lot of network sides can cause terminal to switch, as load balancing, power is controlled, channel switching etc.And these judgements all judge and decision-making that in WAP (wireless access point) one side the object of decision-making is exactly a terminal.So at such ﹠amp; Under the decision condition, just can not allow the terminal that is in frequent switching go to finish, the switching of the network side of purposes such as power control decision such as load balancing.Because these terminals not only might can not finished, and certainly, the loss meeting that causes is greater than income.Therefore, behind the switchover policy that has upgraded terminal, WAP (wireless access point) will be upgraded switchover policy at this terminal that is in frequent switching.
Also have in addition a bit and be exactly: in order to keep the consistency with existing standard, under the initial switchover policy, terminal is not consider the factor of network side, and WAP (wireless access point) is when the switching of processing terminal, because terminal is not in frequent switching, can satisfy terminal as much as possible.So need being updated to, the switchover policy of WAP (wireless access point) side can avoid the frequent strategy that switches.
The frequent switching condition that relates in the avoidance strategy that switches also can comprise: start the signal strength threshold condition of switching, start the load level conditions of switching, start the error rate condition of switching, start the power controlled condition of switching and start the channel quality conditions of switching, or the part or all of combination of above-mentioned condition etc.Can certainly increase new conditioned disjunction and delete some switching conditions.But, switch in the avoidance strategy frequent, these switching conditions and parameter thereof be arranged so that satisfying of switching condition is more difficult.Such as, the load level that WAP (wireless access point) start to be switched is heightened, make and also do not judge and will switch when the load level reaches thresholding in the initial switchover policy; And for example, the signal strength threshold condition of this connection that starting terminal is switched is turned down, and makes when the signal strength signal intensity of this connection is reduced to thresholding in the initial switchover policy, wouldn't switch, when having only the signal strength threshold that further is reduced in the frequent switching avoidance strategy, restart switching.In a word, the switching condition that frequently switches in the avoidance strategy is more strict for starting the restriction of switching, with the generation of avoiding switching once more as far as possible.
The frequent avoidance strategy that switches can just be set in terminal and the WAP (wireless access point) before the judgement of frequent switching state, calls this strategy and upgrade when frequent switching takes place; Also can after detecting frequent switching, set by corresponding network entity again.
To SOT state of termination monitoring is that WAP (wireless access point) by the current connection of terminal realizes according to the statistics to this terminal connect hours.
WAP (wireless access point) is to judge according to the frequent switching condition that switches in the avoidance strategy when judging whether to allow to switch, satisfying the minimal condition that terminal keeps current connection is one of them necessary condition, but this minimal condition is not fixed on some indexs or the condition.
The switchover policy of terminal reverts to initial switchover policy and also can be provided with by terminal oneself.
On the basis of the foregoing description, the present invention can also have various mapping modes.
For example: in other execution mode, in the step 110 to the setting of initial switchover policy, and in the step 140 switchover policy is updated to frequent switching avoidance strategy, and also can carry out extended service set simultaneously, perhaps terminal and WAP (wireless access point) are carried out separately.
And for example, the terminal switching state information of obtaining in the foregoing description WAP (wireless access point) is to be reported by the WAP (wireless access point) of terminal to current connection, but, in another embodiment, the WAP (wireless access point) that can be connected by terminal is record in addition, promptly write down the sign of WAP (wireless access point), and terminal is conciliate the related moment with the moment that WAP (wireless access point) is set up related (comprising the series of fortified passes connection), and, before reaching stable the connection, the switching state information of this record WAP (wireless access point) before switch is delivered to WAP (wireless access point) after the switching, thereby makes the WAP (wireless access point) of the current connection of terminal can know the switching state information of terminal.
Claims (10)
1, the frequent control method of switching in a kind of WLAN (wireless local area network), described radio local network environment comprises two WAP (wireless access point) and a terminal at least, described WAP (wireless access point) is formed extended service set, may further comprise the steps:
(a) the initial switchover policy of setting terminal and/or WAP (wireless access point);
(b) WAP (wireless access point) is obtained the switching state information of terminal, described switching state information comprises wireless access dot information that terminal writes down and the information of connect hours length on each WAP (wireless access point) in continuous handoff procedure, judge according to the current switching state information of terminal whether terminal is in frequent switching state, if, then the switchover policy at this terminal on terminal and/or the WAP (wireless access point) is updated to the frequent switching avoidance strategy that restriction is switched, execution in step (c), otherwise continue to judge;
(c) handoff request that terminal is proposed, WAP (wireless access point) is carried out switching controls according to the frequent switching condition that switches in the avoidance strategy to this terminal, allows or refuse this terminal to switch.
2, the method for claim 1, it is characterized in that, in the described step (b), the terminal switching state information that described WAP (wireless access point) is obtained is to be reported by the WAP (wireless access point) of terminal to current connection, or is write down and the WAP (wireless access point) of WAP (wireless access point) after switching before switching transmit by the WAP (wireless access point) that terminal connects.
3, the method for claim 1, it is characterized in that, in the described step (c), the WAP (wireless access point) of the current connection of described terminal continues the connect hours of the described terminal of monitoring, if should the connect hours greater than the thresholding that is provided with, think that then this terminal is in stable connection status, the switchover policy at this terminal on terminal and/or the WAP (wireless access point) is reverted to initial switchover policy, return step (b).
4, the method for claim 1 is characterized in that, the condition that the middle judgement of described step (b) terminal is in frequent switching state is the part or all of of following condition:
Terminal is in continuous handoff procedure, if the connect hours sum on each WAP (wireless access point) thinks then that greater than default maximum connect hours thresholding this terminal is in frequent switching state;
Terminal if switch back and forth, thinks that then this terminal is in frequent switching state between several WAP (wireless access point) in continuous handoff procedure.
5, the method for claim 1, it is characterized in that, described initial switchover policy and the frequent avoidance strategy that switches comprise following part or all of switching condition: start the signal strength threshold condition of switching, start the load level conditions of switching, start the error rate condition of switching, start the power controlled condition of switching and start the channel quality conditions of switching.
6, method as claimed in claim 5 is characterized in that, condition and parameter limit thereof that switching condition that is provided with in the described frequent switching avoidance strategy and parameter thereof are compared initial switchover policy are more strict.
7, method as claimed in claim 6 is characterized in that, in the frequent switching avoidance strategy of described WAP (wireless access point) at described terminal, no longer allows the terminal that has been in frequent switching go to finish the switching decision of network side.
8, method as claimed in claim 6 is characterized in that, switches in the avoidance strategy frequent:
The load level that WAP (wireless access point) start to be switched is heightened, made and also do not judge and to switch when the load level reaches thresholding in the initial switchover policy;
The signal strength threshold condition of this connection that starting terminal is switched is turned down, make when the signal strength signal intensity of this connection is reduced to thresholding in the initial switchover policy, wouldn't switch, when having only the signal strength threshold that further is reduced in the frequent switching avoidance strategy, restart switching.
9, the method for claim 1 is characterized in that, in the described step (c), WAP (wireless access point) allows described terminal to switch as described, and after this terminal switching was finished, also the switchover policy of this terminal was set to initial switchover policy.
10, the method for claim 1 is characterized in that, also sets the initial switchover policy of extended service set in the described step (a), and in the described step (b), also the switchover policy that extended service set is adopted is updated to frequent switching avoidance strategy.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100865562A CN100499551C (en) | 2006-06-22 | 2006-06-22 | Method for controlling frequent switching in wireless local area network |
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| CNB2006100865562A CN100499551C (en) | 2006-06-22 | 2006-06-22 | Method for controlling frequent switching in wireless local area network |
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| CN101094128A CN101094128A (en) | 2007-12-26 |
| CN100499551C true CN100499551C (en) | 2009-06-10 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| BRPI0910687A2 (en) * | 2008-04-22 | 2017-12-26 | Nortel Networks Ltd | handover restriction of a mobile station |
| CN103262608B (en) * | 2010-12-17 | 2016-08-17 | 西门子公司 | A kind of method for handover control, Apparatus and system |
| CN103002272A (en) * | 2011-09-15 | 2013-03-27 | 上海聚力传媒技术有限公司 | Method, device and equipment for switching code rate of audio and video information |
| CN102695243B (en) * | 2012-06-15 | 2016-02-10 | 宇龙计算机通信科技(深圳)有限公司 | Initial network entry connection establishment communicator and method |
| CN102724721B (en) * | 2012-06-28 | 2015-09-09 | 华为技术有限公司 | The method of cell merge and base station |
| CN105142188A (en) * | 2015-06-19 | 2015-12-09 | 联想(北京)有限公司 | Network type switching method and electronic equipment |
| CN105657755B (en) * | 2016-01-06 | 2018-03-02 | 广东欧珀移动通信有限公司 | A kind of control method and device of channel |
| CN106060007B (en) * | 2016-05-10 | 2019-10-11 | 上海斐讯数据通信技术有限公司 | A kind of user login information jitter-prevention processing method and system |
| CN111314900B (en) * | 2020-03-23 | 2022-08-09 | Oppo广东移动通信有限公司 | Wireless connection method, wireless connection device and mobile terminal |
| CN115022817A (en) * | 2022-05-30 | 2022-09-06 | 无锡富华物联科技有限公司 | Offline ear tag data transmission method, system and terminal |
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