CN100463557C - Method for detecting frequent handoff in wireless LAN environment - Google Patents

Method for detecting frequent handoff in wireless LAN environment Download PDF

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Publication number
CN100463557C
CN100463557C CNB2004800439259A CN200480043925A CN100463557C CN 100463557 C CN100463557 C CN 100463557C CN B2004800439259 A CNB2004800439259 A CN B2004800439259A CN 200480043925 A CN200480043925 A CN 200480043925A CN 100463557 C CN100463557 C CN 100463557C
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switching
website
access point
frequent
record
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CN101015223A (en
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孙波
高音
马凤国
李峰
吴少华
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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

Detect the frequent method of switching in a kind of radio local network environment
Technical field
The present invention relates to the wireless local area network (WLAN) system in the communications field, relate in particular to and detect the frequent method of switching in a kind of radio local network environment.
Background technology
WLAN (wireless local area network), as meet the wireless network of IEEE802.11a/b/g is meant that the employing wireless communication technology is interconnected with computer equipment, and formation can mutual communication and realized the network system of resource-sharing.
In the wireless lan network environment, a typical network topology structure is called the expansion service group, the expansion service group system is by one or more basic service sets, and the compartment system formation that connects these basic service sets, and each basic service sets comprises a wireless access point device.In the expansion service group structure of WLAN (wireless local area network) as shown in Figure 1, two basic service sets 1,2 that connect by compartment system have been comprised.The expansion service group is distinguished by the expansion service group id, and WAP (wireless access point) is by basic service set identification, and promptly access point identity is distinguished.Website obtains expansion service group and basic service sets information in the radio local network environment of living in by scanning channel, and selects to add a suitable basic service sets.
When a website need join in the wireless lan network, through with the connection process of this access point, could begin to communicate by letter normally.A certain moment website can only be set up with an access point and connect.When website need change some connection attribute, can initiate connection process once more.
Website 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, website can be set up and the connecting of new access point by heavy connection process, and the connecting of cut-out and old access point, this process is called switching.
Present protocol of wireless local area network is the condition switched of regulation website not, the general method of switch window 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 website discovery.But the wireless environment of acute variation and switch window value improperly is set causes website between the close access point of two signal qualitys, frequently to switch.
Summary of the invention
The objective of the invention is to propose detect in a kind of radio local network environment the frequent method of switching, the historical information of the access point that the wireless terminal record is connected to, and judge whether in view of the above between two access points, to take place at short notice repeatedly to switch, thereby provide foundation for avoiding website frequently to switch under the radio local network environment, and then can avoid the frequent access efficiency that causes that switches to descend.
For achieving the above object, the present invention proposes and detect the frequent method of switching in a kind of radio local network environment, its characteristics are, comprise the steps:
Step 1 is created switching information record, by a Website Building and maintenance;
Step 2, switching condition judge that website by scanning channel, is sought another access point that satisfies switching condition after inserting an access point, then carry out next step if exist, otherwise proceed switching state scanning;
Step 3, frequent switching state judges website judges according to the effective record in the current switching information record whether website is in frequent switching state, and switches not being under the frequent switching state;
Step 4, the record handover information, website is finished switching back renewal switching information record, a newly-increased entry;
Step 5, when newly-increased entry is opened age mechanism, carry out the maintenance and the processing of handover information, proceed the access or the scanning of website simultaneously.
Detect the frequent method of switching in the described radio local network environment, in step 1, described switching information record is created in this locality by website, and every record need at least to preserve a current access point identification field and one can be switched into the new access point identification field.
Detect the frequent method of switching in the described radio local network environment, in step 5, be that age, timer carried out the maintenance and the processing of switching information record for the moment in startup, each record is all effective in a set time in this switching information record, and this entry correspondence the time when age, timer expired, delete corresponding switching information record item, cancel when corresponding the timer in age simultaneously.
Detect the frequent method of switching in the described radio local network environment, in step 2, also comprise the steps:
Website is set up with an access point and is connected;
This website is in no switching state;
Judge whether the entry in the switching information record of this website lost efficacy,, and cancel when corresponding the timer in age if the failure logging (record) item is then deleted and correspondingly switched record;
Scanning channel is sought another access point that satisfies switching condition.
Detect the frequent method of switching in the described radio local network environment, in step 3, also comprise the steps:
Website finds another access point that satisfies switching condition;
This website is in the pre-switch state;
Website add up in the current switching information record effectively and with the entry of current access point identifier, new access point identifier coupling;
If the matched record item number is greater than a default frequent handoff threshold, then this website is in frequent switching state, ends to switch, and proceeds switching state scanning;
If the matched record item number is not more than a default frequent handoff threshold, this website then is set is in changeable state, and switch to another access point.
Description of drawings
Fig. 1 is the expansion service group schematic diagram of WLAN (wireless local area network) of the present invention;
Fig. 2 is the schematic diagram of the inventive method one embodiment;
Fig. 3 is to use the specific implementation process of website switch decision of the present invention;
Fig. 4 is the state transition graph of point of termination station of the present invention.
Embodiment
Method of the present invention is applicable to the described wireless lan network structure of Fig. 1.In the radio local network environment that method of the present invention is used, there are two the access point AP1 and the AP2 that belong to same expansion service group at least, there is a point of termination station STA simultaneously.
The related content of method of the present invention may further comprise the steps:
(1) create switching information record: site STA is at this locality structure and safeguard switching information record, and every record needs to preserve a new access point identification field and a current access point identification field at least.
(2) switching condition is judged: site STA by wireless signal in the scan empty, seek whether there is another one access point AP2, and AP2 satisfies existing switching condition after being connected to access point AP1.If find to satisfy the access point AP2 of switching condition, then carry out next procedure, otherwise proceed switching state scanning.
(3) frequent switching state is judged: site STA add up in the current switching information record table effectively and with the identifier of current access point AP1 and (or) record of the identifier coupling of new access point AP2, if above-mentioned statistical value surpasses certain fixing threshold value, then site STA is in frequent switching state; If above-mentioned statistical value does not have to surpass certain fixing threshold value, then site STA is not in frequent switching state
(4) record handover information: if site STA has been carried out handover operation between access point AP1 and access point AP2, and set up with access point AP2 and to have connected, then site STA is inserted the identification number of access point AP2 new access point identity territory in new switching information record, and the identification number of access point AP1 is inserted the current access point identification field.
When (5) newly-increased entry being opened age mechanism: site STA to each record in the switching information record table all in a certain set time effectively, when the record life span surpasses said fixing after the time, this record is with deleted.When site STA starts one to this above-mentioned newly-increased list item immediately age timer.If the list item correspondence the time age timer expire, then above-mentioned list item will be deleted from the switching information record table, timer also will be cancelled age when corresponding.
Below in conjunction with drawings and Examples the present invention is described in further details.
One of the present invention practices environment as shown in Figure 2.
Equipment 100 is the wireless network card equipment of compliant wireless local area networks standard IEEE 802.11a/b/g.
Equipment 101 and 102 is the wireless access point device of compliant wireless local area networks standard IEEE 802.11a/b/g.
Equipment 100 detects equipment 101 and equipment 102 by scanning channel, and selection equipment 101 is set up connection.
A frequent change detection process that meets the equipment 100 that the present invention describes is described below (state transition graph of equipment 100 is seen Fig. 4) as shown in Figure 3:
Step 1, equipment 100 are set up with equipment 101 and are connected.
Step 2, equipment 100 are set to not have switching state.
Step 3, did the switching record in the switching information record table of judgment device 100 lose efficacy? if the record of inefficacy is arranged, then go to step 4, otherwise go to step 5.
Step 4, the record that lost efficacy in the deletion switching information record table, and cancel corresponding timer.
Step 5, whether equipment 100 search exists the better equipment 102 of signal quality, and equipment 102 satisfies current switching condition, if find then go to step 6; Otherwise change step 2.
Step 6, the state of equipment 100 oneself is set to the pre-switch state.
Step 7, equipment 100 be according to the identifier of equipment 101, the identifier of equipment 102, the entry of statistical match in the handover information tabulation.
Step 8, is the record item number of judging coupling greater than frequent handoff threshold? if the matched record item number greater than frequent handoff threshold, then goes to step 9; Otherwise go to step 11.
Step 9, the state of equipment 100 oneself is set to frequent switching state.
Step 10, equipment 100 is ended to switch, and goes to step 2.
Step 11, the state of equipment 100 oneself is set to changeable state.
Step 12, equipment 100 switch to equipment 102 according to current switching flow by equipment 101.
After step 13, equipment 100 are in changeable state and finish existing handoff procedure, upgrade the handover information tabulation.Newly-increased record in handover information tabulation, the identification number of recording equipment 101 and equipment 102 at least in this record.
Step 14 is record list item sliding window start-up time timer newly-increased in the switching information record table, to picking up counting the life cycle of this list item.After the sliding window counting finished, this list item and corresponding sliding window timer were cancelled, and go to step 2.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Industrial applicability
The present invention judges by the analysis to the handover information that records whether website is sent out in recently a period of time Living frequent the switching provides foundation for avoiding frequent the switching, improved website switching under the radio local network environment The time access efficiency.

Claims (5)

1. detect the frequent method of switching in a radio local network environment, it is characterized in that, comprise the steps:
Step 1 is created switching information record, by a Website Building and maintenance;
Step 2, switching condition judge that website by scanning channel, is sought another access point that satisfies switching condition after inserting an access point, then carry out next step if exist, otherwise proceed switching state scanning;
Step 3, frequent switching state judges website judges according to the effective record in the current switching information record whether website is in frequent switching state, and switches not being under the frequent switching state;
Step 4, the record handover information, website is finished switching back renewal switching information record, a newly-increased entry;
Step 5, when newly-increased entry is opened age mechanism, carry out the maintenance and the processing of handover information, proceed the access or the scanning of website simultaneously.
2. detect the frequent method of switching in the radio local network environment according to claim 1, it is characterized in that, in step 1, described switching information record is created in this locality by website, and every record need at least to preserve a current access point identification field and one can be switched into the new access point identification field.
3. detect the frequent method of switching in the radio local network environment according to claim 1 and 2, it is characterized in that, in step 5, be that age, timer carried out the maintenance and the processing of switching information record for the moment in startup, each record is all effective in a set time in this switching information record, and this entry correspondence the time when age, timer expired, delete corresponding switching information record item, cancel when corresponding the timer in age simultaneously.
4. detect the frequent method of switching in the radio local network environment according to claim 3, it is characterized in that, in step 2, also comprise the steps:
Website is set up with an access point and is connected;
This website is in no switching state;
Judge whether the entry in the switching information record of this website lost efficacy,, and cancel when corresponding the timer in age if the failure logging (record) item is then deleted and correspondingly switched record;
Scanning channel is sought another access point that satisfies switching condition.
5. detect the frequent method of switching in the radio local network environment according to claim 4, it is characterized in that, in step 3, also comprise the steps:
Website finds another access point that satisfies switching condition;
This website is in the pre-switch state;
Website is added up in the current switching information record effectively, and with the entry of current access point identifier and new access point identifier coupling;
If the matched record item number is greater than a default frequent handoff threshold, then this website is in frequent switching state, ends to switch, and proceeds switching state scanning;
If the matched record item number is not more than a default frequent handoff threshold, this website then is set is in changeable state, and switch to another access point.
CNB2004800439259A 2004-07-12 2004-07-12 Method for detecting frequent handoff in wireless LAN environment Active CN100463557C (en)

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PCT/CN2004/000784 WO2006005225A1 (en) 2004-07-12 2004-07-12 A method for detecting frequent handover in the wireless local area network

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CN100463557C true CN100463557C (en) 2009-02-18

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106488523A (en) * 2015-08-24 2017-03-08 大唐移动通信设备有限公司 A kind of method and apparatus of suppression antenna transmission mode frequent switching
CN113613239A (en) * 2021-08-09 2021-11-05 中国电信股份有限公司 Network mode switching method, network mode switching device, medium, and electronic device

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Publication number Priority date Publication date Assignee Title
SI21945A (en) 2004-11-10 2006-06-30 Vinko Kunc Voltage comparator
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
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
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

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US5530910A (en) * 1993-12-27 1996-06-25 Nec Corporation Handover method in mobile communications system
CN1411666A (en) * 1999-10-29 2003-04-16 艾利森电话股份有限公司 Channel-type switching from dedicated channel to common channel based on common channel load
WO2004047479A2 (en) * 2002-11-15 2004-06-03 Nokia Corporation Smart inter-technology handover control

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US5530910A (en) * 1993-12-27 1996-06-25 Nec Corporation Handover method in mobile communications system
CN1411666A (en) * 1999-10-29 2003-04-16 艾利森电话股份有限公司 Channel-type switching from dedicated channel to common channel based on common channel load
WO2004047479A2 (en) * 2002-11-15 2004-06-03 Nokia Corporation Smart inter-technology handover control

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106488523A (en) * 2015-08-24 2017-03-08 大唐移动通信设备有限公司 A kind of method and apparatus of suppression antenna transmission mode frequent switching
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
CN113613239A (en) * 2021-08-09 2021-11-05 中国电信股份有限公司 Network mode switching method, network mode switching device, medium, and electronic device

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CN101015223A (en) 2007-08-08
AU2004321459B2 (en) 2010-01-14
AU2004321459A1 (en) 2006-01-19
WO2006005225A1 (en) 2006-01-19

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