CN101015223A - Method for detecting frequent handoff in wireless LAN environment - Google Patents
Method for detecting frequent handoff in wireless LAN environment Download PDFInfo
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- CN101015223A CN101015223A CNA2004800439259A CN200480043925A CN101015223A CN 101015223 A CN101015223 A CN 101015223A CN A2004800439259 A CNA2004800439259 A CN A2004800439259A CN 200480043925 A CN200480043925 A CN 200480043925A CN 101015223 A CN101015223 A CN 101015223A
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- switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Small-Scale Networks (AREA)
Abstract
The present invention relates to a method for detecting frequent handover in the wireless local area network, comprising the steps of: creating the handover information recording, the said information being created and maintained by a station, determining the handover condition, after the station having accessed to a access point, searching for another access point which satisfying the condition by scanning the channel, if such a point existing, then going to the next step, otherwise continuing to scan the handover state, and determining the frequent handover state, and the said station determining whether itself being in frequent handover state according to the current handover information recording, handing over if not being in frequent handover state and recording the handover information, the station updating the handover information recording after completing the handover, incrementing the recording items, starting the time counter mechanism for the new recording items and maintaining and processing the handover information, and the said station continuing to aceess or scan in the network. The method of the present invention provides the basis to avoid the frequent handover, and improves the efficiency of accessing during the handover in the wireless local area network.
Description
A kind of method that frequent switching is detected in radio local network environment
Technical field
The present invention relates to a kind of method that frequent switching is detected in the wireless local area network (WLAN) system in the communications field, more particularly to radio local network environment.Background technology
WLAN, such as meets IEEE802.11a/b/g wireless network, refers to that the employing wireless communication technology interconnects computer equipment, composition can communicate and realize the network system of resource-sharing.
In wireless lan network environment, one typical network topology structure is referred to as expansion service group, expansion service system is united by one or more basic service sets, and couples the compartment system composition of these basic service sets, and each basic service sets include a wireless access point device.In the expansion service group structure of WLAN as shown in Figure 1, include two basic service sets 1,2 coupled by compartment system.Expansion service group is identified to distinguish by expansion service group, and WAP is distinguished by basic service set identification, i.e. access point identity.Website obtains expansion service group and basic service group information in residing radio local network environment by scanning channel, and selects to add a suitable basic service sets.
When a website needs to be added in a wireless lan network, by the connection process with the access point, normal communication could be started.A certain moment website can only be set up with an access point to be coupled.When website needs to change some connection attributes, connection process again can be initiated.
Website with an access point foundation after coupling, the more preferable access point of signal quality is checked whether there is by scanning channel to exist, if such access point is present, website can be set up by weight connection process to be coupled with new access point, and cut off and couple with old access point, this process is referred to as switching.
Current protocol of wireless local area network is not specified by the condition that website is switched over, the general method using switch window is realized, i.e., just switched over when the signal quality of the new access point of a website discovery default switch window value higher than old access point signals quality.But improperly switch window value can cause website frequent switching between the close access point of two signal qualitys for the wireless environment of acute variation and setting.Disclosure of the invention
It is an object of the invention to a kind of method for proposing to detect frequent switching in radio local network environment, the historical information for the access point that wireless terminal record is connected to, and judge whether accordingly in a short time in two accesses
Repeatedly switching occurs between point, so as to avoid website frequent switching to provide foundation under radio local network environment, and then the access efficiency that frequent switching can be avoided to cause declines.
For achieving the above object, the present invention proposes a kind of method that frequent switching is detected in radio local network environment, and its feature is, comprises the following steps：
Step one, switching information record is created, by a Website Building and is safeguarded；
Step 2, switching conditions judge that website, by scanning channel, finds another access point for meeting switching condition after an access point has been accessed, if carrying out next step in the presence of if, otherwise proceeds switching state scanning；
Step 3, frequent switching condition adjudgement, effective record of the website in current switching information record judges that whether website is in frequent switching state, and switch in the case where being not in frequent switching state；Step 4, records handover information, and website updates switching information record after switching is completed, and increases an entry newly；
Step 5, opens Shi Elderly mechanism to newly-increased entry, the maintenance and processing of information is switched over, while proceeding the access or scanning of website.
The method that frequent switching is detected in described radio local network environment, in step one, the switching information record is being locallyd create by website, and each record at least need to preserve a current access point identification field and one can be switched into new access point identification field.
The method that frequent switching is detected in described radio local network environment, in step 5, it is to start age in a period of time timer to switch over the maintenance and processing of information record, each single item record is effective all within a set time in the switching information record, and when when the entry is corresponding, age timer expires, corresponding switching information record is deleted, while age timer when cancelling corresponding.
The method that frequent switching is detected in described radio local network environment, in step 2, also comprises the following steps：
Website is set up with an access point to be coupled；
The website is in without switching state；
Judge whether the entry in the switching information record of the website fails, if failure logging (record) item then deletes correspondence switching record, and age timer when cancelling corresponding；
Channel is scanned, another access point for meeting switching condition is found.
The method that frequent switching is detected in described radio local network environment, in step 3, also comprises the following steps：
Website finds another access point for meeting switching condition；
The website is in pre-switch state；
The effective and entry that is matched with current access point identifier, new access point identifier in the current switching information record of station statistics；
If matching record item number is more than a default frequent switching thresholding, the website is in frequent switching state, stops switching, proceeds switching state scanning；
If matching record item number is not more than a default frequent switching thresholding, the website is set to be in changeable state, and be switched to another access point.Brief Description Of Drawings
Fig. 1 is the expansion service group schematic diagram of WLAN of the present invention；
Fig. 2 is the schematic diagram of the embodiment of the inventive method one；
Fig. 3 is the specific implementation process of the website switch decision using the present invention；
Fig. 4 is the state transition graph of the point of termination station of the present invention.The best mode of the realization present invention '
The method of the present invention is applied to the wireless lan network structure described in Fig. 1.In the radio local network environment of the method application of the present invention, at least there are two access points API and AP2 for belonging to same expansion service group, while in the presence of a point of termination station STA.
The present invention method involved by content comprise the following steps-
(1) switching information record is created：Site STA is locally constructing and is safeguarding switching information record, and each record at least needs to preserve a new access point identification field and a current access point identification field.
(2) switching condition judges：Site STA is after access point API is had been coupled to, by scanning on-air radio signal, looks for whether there is another access point AP2, and AP2 meets existing switching condition.If it find that meeting the access point AP2 of switching condition, then next step is carried out, otherwise proceed switching state scanning.
(3) frequent switching condition adjudgement：Site STA count in current switching information record table the effective and identifier with current access point API and（Or）The record of new access point AP2 identifier matching, if above-mentioned statistical value exceedes the threshold value of some fixation, site STA is in frequent switching state；If above-mentioned statistical value is not above the threshold value of some fixation, site STA is not in frequently cutting
Change state
(4) handover information is recorded：If site STA has carried out handover operation between access point API and access point AP2, and establish and couple with access point AP2, then site STA inserts access point AP2 identification number in new switching information record in new access point identity domain, and access point API identification number is inserted into current access point identification field.
(5) age mechanism when being opened to newly-increased entry：Site STA is recorded all within a certain set time effectively to each single item in switching information record table, after life span is recorded more than the above-mentioned set time, and the record will be deleted.Site STA starts Yi Shi Elderly timer to the above-mentioned newly-increased list item immediately.If timer expires age when list item is corresponding, above-mentioned list item will be deleted from switching information record table, and age timer will be also revoked when corresponding.
The present invention is described in further details with reference to the accompanying drawings and examples.
It is as shown in Figure 2 that one of the present invention practices environment.
Equipment 100 is the wireless network card equipment for meeting the la/b/g of WLAN standard IEEE 802.1.
Equipment 101 and 102 is the wireless access point device for meeting the la/b/g of WLAN standard IEEE 802.1.
Equipment 100 detects equipment 101 and equipment 102, and select equipment 101 to set up connection by scanning channel.
Meet a frequent switching detection process of the equipment 100 that the present invention is described as shown in figure 3, being described as follows（The state transition graph of equipment 100 is shown in Fig. 4)：
Step 1, equipment 100 is set up with equipment 101 and coupled.
Step 2, equipment 100 is set to no switching state.
Step 3, judge whether the record of the switching in the switching information record table of equipment 100 failsIf the record of failure, then step 4 is gone to, step 5 is otherwise gone to.
Step 4, the record failed in switching information record table is deleted, and cancels corresponding timer.
Step 5, the search of equipment 100 whether there is the more preferable equipment 102 of signal quality, and equipment 102 meets current switching condition, and step 6 is gone to if finding;Otherwise 2 are gone to step.
Step 6, the state of oneself is set to pre-switch state by equipment 100.
Step 7, equipment 100 is according to the identifier of equipment 101, the identifier of equipment 102, the entry of statistical match in handover information list.
Step 8, judge whether the record item number of matching is more than frequent switching thresholdingIf matching record item number
More than frequent switching thresholding, then step 9 is gone to;Otherwise step 11 is gone to.
Step 9, the state of oneself is set to frequent switching state by equipment 100.
Step 10, equipment 100 stops switching, and goes to step 2.
Step 11, the state of oneself is set to changeable state by equipment 100.
Step 12, equipment 100 switches to equipment 102 according to current switching flow by equipment 101.Step 13, equipment 100 is in changeable state and completed after existing handoff procedure, updates handover information list.Increase a record, at least recording equipment 101 and the identification number of equipment 102 in the record newly in handover information list.
Step 14, it is that the record list item increased newly in switching information record table starts time slide window timer, timing is started to the life cycle of the list item.After sliding window counting terminates, the list item and corresponding sliding window timer are revoked, and go to step 2.
Certainly; the present invention can also have other various embodiments; in the case of without departing substantially from spirit of the invention and its essence; those skilled in the art work as can make various corresponding changes and deformation according to the present invention, but these corresponding changes and deformation should all belong to the protection domain of appended claims of the invention.Industrial applicability
The present invention judges whether website occurs frequent switching by the analysis to the handover information of record within nearest a period of time, to avoid frequent switching from providing foundation, improves access efficiency when website switches under radio local network environment.
Claims (5)
- Claims1st, a kind of method that frequent switching is detected in radio local network environment, it is characterised in that including such as lower halfStep one, switching information record is created, by a Website Building and is safeguarded；Step 2, switching condition judges that website, by scanning channel, finds another access point for meeting switching condition after an access point has been accessed, if carrying out next step in the presence of if, otherwise proceeds switching state scanning；Step 3, frequent switching condition adjudgement, effective record of the website in current switching information record judges that whether website is in frequent switching state, and switch in the case where being not in frequent switching state；Step 4, records handover information, and website updates switching information record after switching is completed, and increases an entry newly；Step 5, age mechanism when being opened to newly-increased entry, switches over the maintenance and processing of information, while proceeding the access or scanning of website.2nd, the method that frequent switching is detected in radio local network environment according to claim 1, it is characterized in that, in step one, the switching information record is being locallyd create by website, and each record at least need to preserve a current access point identification field and one can be switched into new access point identification field.3rd, the method that frequent switching is detected in radio local network environment according to claim 1 or 2, it is characterized in that, in step 5, it is to start age in a period of time timer to switch over the maintenance and processing of information record, each single item record is effective all within a set time in the switching information record, and when age timer expires when the entry is corresponding, corresponding switching information record is deleted, while age timing when cancelling corresponding4th, the method that frequent switching is detected in radio local network environment according to claim 3, it is characterised in that in step 2, also comprise the following steps：Website is set up with an access point to be coupled；The website is in without switching state；Judge whether the entry in the switching information record of the website fails, if failure logging (record) item then deletes correspondence switching record, and age timer when cancelling corresponding；Channel is scanned, another access point for meeting switching condition is found.5th, the method that frequent switching is detected in radio local network environment according to claim 4, it is special Levy and be, in step 3, also comprise the following steps：Website finds another access point for meeting switching condition；The website is in pre-switch state；The effective and entry that is matched with current access point identifier, new access point identifier in the current switching information record of station statistics； .If matching record item number is more than a default frequent switching thresholding, the website is in frequent switching state, stops switching, proceeds switching state scanning；If matching record item number is not more than a default frequent switching thresholding, the website is set to be in changeable state, and be switched to another access point.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/000784 WO2006005225A1 (en) | 2004-07-12 | 2004-07-12 | A method for detecting frequent handover in the wireless local area network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101015223A true CN101015223A (en) | 2007-08-08 |
| CN100463557C CN100463557C (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800439259A Active CN100463557C (en) | 2004-07-12 | 2004-07-12 | Method for detecting frequent handoff in wireless LAN environment |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN100463557C (en) |
| AU (1) | AU2004321459B2 (en) |
| WO (1) | WO2006005225A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026222A (en) * | 2009-09-09 | 2011-04-20 | 上海华为技术有限公司 | Ping-pong reselection control method, device and system |
| CN102880512A (en) * | 2011-07-12 | 2013-01-16 | 联想(北京)有限公司 | Working state switching method, working state switching device and electronic equipment terminal |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SI21945A (en) | 2004-11-10 | 2006-06-30 | Vinko Kunc | Voltage comparator |
| CN106488523B (en) * | 2015-08-24 | 2019-11-22 | 大唐移动通信设备有限公司 | A kind of method and apparatus inhibiting antenna transmission mode frequent switching |
| US10244464B2 (en) * | 2016-11-04 | 2019-03-26 | General Electric Company | System and method for evaluating non-optimal roaming of a client device |
| CN113286335B (en) * | 2021-03-30 | 2023-01-31 | 珠海泰芯半导体有限公司 | Frequency point switching method and device, storage medium and access point |
| CN113613239B (en) * | 2021-08-09 | 2023-03-24 | 中国电信股份有限公司 | Network mode switching method, network mode switching device, medium, and electronic device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2671789B2 (en) * | 1993-12-27 | 1997-10-29 | 日本電気株式会社 | Handover method in mobile communication system |
| US20030012217A1 (en) * | 1999-10-29 | 2003-01-16 | Christoffer Andersson | Channel-type switching to a common channel based on common channel load |
| US7751818B2 (en) * | 2002-11-15 | 2010-07-06 | Nokia Corporation | Smart inter-technology handover control |
-
2004
- 2004-07-12 CN CNB2004800439259A patent/CN100463557C/en active Active
- 2004-07-12 WO PCT/CN2004/000784 patent/WO2006005225A1/en active Application Filing
- 2004-07-12 AU AU2004321459A patent/AU2004321459B2/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026222A (en) * | 2009-09-09 | 2011-04-20 | 上海华为技术有限公司 | Ping-pong reselection control method, device and system |
| CN102880512A (en) * | 2011-07-12 | 2013-01-16 | 联想(北京)有限公司 | Working state switching method, working state switching device and electronic equipment terminal |
| CN102880512B (en) * | 2011-07-12 | 2016-01-27 | 联想(北京)有限公司 | A kind of changing method of duty, switching device shifter and electronic device terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100463557C (en) | 2009-02-18 |
| AU2004321459B2 (en) | 2010-01-14 |
| AU2004321459A1 (en) | 2006-01-19 |
| WO2006005225A1 (en) | 2006-01-19 |
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