CN1756412A - Station switching method in WLAN - Google Patents
Station switching method in WLAN Download PDFInfo
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- CN1756412A CN1756412A CN 200410051691 CN200410051691A CN1756412A CN 1756412 A CN1756412 A CN 1756412A CN 200410051691 CN200410051691 CN 200410051691 CN 200410051691 A CN200410051691 A CN 200410051691A CN 1756412 A CN1756412 A CN 1756412A
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Abstract
The invention relates to site switch method in wireless LAN on management of access controller. Wherein, the said LAN comprises an access control device connected to a plurality of wireless access points by a distributed network device. the said method comprises: searching proper switch access point; constructing and sending switch application request; the said access control device processes the switch; site switches to objective side. This method ensures high-layer business continuity and increases switch speed.
Description
Technical field
The present invention relates to the wireless local area network (WLAN) system website handoff technique in the communications field, especially relate to the method that the website in the WLAN (wireless local area network) switches.
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, as shown in Figure 1, the expansion service group system is by one or more basic service sets, an optional access control equipment, and the compartment system formation that connects these basic service sets and access control equipment.Each basic service sets comprises a WAP (wireless access point) (hereinafter to be referred as access point) equipment and several have set up wireless site (hereinafter to be referred as the website) equipment that connects with this access point.Access control equipment is used for the link and the registration status information of interior all access points of maintenance and management expansion service group and website.The expansion service group is distinguished by the expansion service group id, and basic service sets is by basic service set identification, and promptly access point identity is distinguished.
Wireless site 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.Access point in the basic service sets mails to access control equipment with the access information of website and link-state information to be stored and manages.After website connects again with access point or loses connection, access point also will be notified the more state information of new site of access control equipment.
Website with current access point set up connect after, check whether have the better target access of signal quality to exist by scanning channel, if there is such target access to exist, website can be set up and the connecting of target access by association process once more, and cut-out and current access point is related, and this process is called the switching in the radio local network environment.
In the present protocol of wireless local area network, to the control ability of handoff procedure, switching randomness is not strong for above-mentioned access control equipment and current access point, efficient is low.Simultaneously, in existing method, the time of the switching of website comprise cut off with the current access point connect, with target access synchronously, rebulid related, target access with target access and obtain the time-delay that site information etc. is operated, make handoff delay longer, can't guarantee the continuity of website high-level business and the seamless switching of website.
Therefore there is defective in prior art, and awaits improving and development.
Summary of the invention
The method that the object of the present invention is to provide a kind of inner stations of wireless local network to switch, problem to be solved is: improve the control ability of access point in the website handoff procedure in the radio local network environment, reduce handoff delay, guarantee the continuity of website high-level business.
In order to address the above problem, the present invention proposes under a kind of radio local network environment, the method of between current access point and target access, switching at the website of realizing under the access control management, described WLAN (wireless local area network) includes an access control equipment, is connected with a plurality of WAP (wireless access point) by a distributed network equipment; Said method may further comprise the steps:
A) site search is fit to the target access of switching;
B) website structure and transmission handover request request;
C) described access control equipment carries out hand-off process;
D) website switches to target access.
Described method, wherein, step c) is further comprising the steps of:
C1) described access control equipment judges to switch whether allow, reception is from the handover request request of website, and read target access information wherein and switch grade, according to the website of having preserved and access-in point information and above-mentioned handover request information, judge whether this handover request goes through;
C2) if described access control equipment is ratified above-mentioned handover request, described access control equipment migrates to target access with site information, and waits for the affirmation answer of targeted sites; Do not reply if obtain the affirmation of targeted sites at the appointed time, then retry repeatedly; If repeatedly still not obtaining the affirmation of targeted sites at the appointed time, retry replys, then graft failure; Otherwise, transplant successfully;
C3) if access control equipment is ratified this handover request, and site information successfully migrates to target access, the also transmission handover request response of described access control equipment structure; Described access control equipment is a switching state with the state information updating of above-mentioned website simultaneously;
If access control equipment is negated this handover request, perhaps the site information graft failure is then constructed the handover request response negating;
Access control equipment will be constructed good handover request response and will be sent to above-mentioned current access point, and be forwarded to above-mentioned website by above-mentioned current access point by the link of setting up with above-mentioned website;
When c4) described access control equipment was ratified above-mentioned handover request, described access control equipment upgraded the forwarding route of described website, and it is transmitted route definite object access point; Described access control equipment is issued on distributed network and is transmitted lastest imformation simultaneously, and the two-layer equipment on the distribution of notifications formula network upgrades converting route, with the forwarding route definite object access point of above-mentioned website
C5) target access new site connection state information more: described target access receives the portability information from the above-mentioned website of described access control equipment, it is added in the into local user state information tabulation, and, its state is changed to pre-coupled situation with the registered user of above-mentioned website as this basic service sets.
Described method, wherein, described access control equipment is sent to the current access point by through the escape way encrypted the state information of website being sent to target access and will construct good handover request response on the distributed network.
Described method, wherein, described step a) also comprises:
Described website with the current access point set up connects after, the current access point is in the relevant state information of local storage site, and the state information that website is correlated with backs up in described access controller;
Wireless channel around described website cycle or the aperiodic scanning, the access point that searching meets switching condition are as target access, and described website then selects one of them as target access when finding that a plurality of access points that meet switching condition exist; If this website does not have to find that the access point that meets switching condition exists, then continue hold period or aperiodic wireless channel scanning.
Described method, wherein, described switching condition is that signal strength signal intensity or signal interference strength compare greater than certain switch window value.
Described method, wherein, described step b) is further comprising the steps of:
B1) described website structure handover request request message comprises the identification information of additional object access point and switches grade in this message;
B2) described website sends the handover request request, and the handover request request that structure is good is sent to the current access point by the link of having set up;
B3) the handover request request is transmitted in the current access point, and described current access point is forwarded to described access control equipment with this request by the escape way through encryption on the distributed network after receiving handover request request from website.
Described method, wherein, described identification information is the identification number of unique recognition objective access point, and described switching grade is the quantization parameter that the sign target access satisfies the switching condition degree.
Described method, wherein, described step d) is further comprising the steps of:
D1) described website sends to switch and connects request, and cut-out connects with the current access point, and asks by sending to target access to switch to connect, and activates the state of this website in target access, communicates by letter normally; When described website receives from the handover request response of the refusal of above-mentioned access point, then stop to switch, continue to keep connecting with the current access point;
D2) described target access structure and transmission switching connection respond, and inquiry the local user tabulate, if existence is in this user of pre-coupled situation, then its state is changed to coupled situation, and the successful switching connection response of answer, begin proper communication; Otherwise the switching of replying failure connects response;
D3) this target access sends above-mentioned website finishing switching notice to described access control equipment, and the state information of indicating described access control equipment to upgrade above-mentioned website is normal coupled situation.
The method that a kind of inner stations of wireless local network provided by the present invention is switched, because having adopted an access control equipment that is provided with in WLAN (wireless local area network) is responsible for the relevant information of the wireless site passage by safety is sent to the Target Wireless access point, be used to upgrade the wireless site state information, and transmit lastest imformation by issue and upgrade converting route in the related network device, on the basis of improving switch speed, guaranteed the continuity of wireless site high-level business.
Description of drawings
Fig. 1 is the expansion service group schematic diagram of the WLAN (wireless local area network) of prior art;
Fig. 2 is the system configuration schematic diagram of the preferred embodiment of the method switched of inner stations of wireless local network of the present invention;
Fig. 3 is the switching flow schematic diagram of the method for inner stations of wireless local network switching of the present invention.
Embodiment
Below will be described in more detail preferred embodiment of the present invention.
Core concept of the present invention be at wireless site when the current wireless access point switches to target access, wireless site at first sends handover request by the current wireless access point to an access control equipment, and determines whether to switch according to the handover request response of this access control equipment; Described access control equipment also is responsible for the relevant information of the wireless site passage by safety is sent to the Target Wireless access point, is used to upgrade the wireless site state information; Described access control equipment is also transmitted lastest imformation by issue and is upgraded converting route in the related network device.The changing method that the present invention relates to allows wireless site directly to enter coupled situation after switching, has guaranteed the continuity of wireless site high-level business on the basis of improving switch speed.
The method that a kind of inner stations of wireless local network of the present invention is switched, as shown in Figures 2 and 3, described WLAN (wireless local area network) includes an access control equipment, is connected with a plurality of WAP (wireless access point) by a distributed network equipment; Its method may further comprise the steps:
The first step, described site search is fit to the target access of switching;
Described website with the current access point set up connects after, the current access point is in the relevant state information of local storage site, and the state information that website is correlated with backs up in described access controller.
Wireless channel around described website cycle or the aperiodic scanning is sought the access point that meets switching condition, and this condition can be that signal strength signal intensity or signal interference strength compare greater than certain switch window value, also can be other switching condition.
If described website finds the access point that meets switching condition and exists, then with this access point as target access.If website is found a plurality of access points that meet switching condition and is existed, then selects one of them as target access.If website does not have to find that the access point that meets switching condition exists, then continue hold period or aperiodic wireless channel scanning.
Second step, website structure and transmission handover request request;
This step may further comprise the steps again:
1. described website structure handover request request message needs to comprise the identification information of additional object access point and switches grade in this message.
2. website sends the handover request request, and the handover request request that structure is good is sent to the current access point by the link of having set up.
3. the handover request request is transmitted in the current access point, and the current access point is forwarded to access control equipment with this request by the escape way through encryption on the distributed network after receiving handover request request from website.
Wherein, above-mentioned identification information is the identification number of unique recognition objective access point, and above-mentioned switching grade is the quantization parameter that the sign target access satisfies the switching condition degree.
In the 3rd step, described access control equipment carries out hand-off process;
This step may further comprise the steps again:
1. described access control equipment judges to switch whether allow:
Described access control equipment receives the handover request request from website, and reads target access information wherein and switch grade.Described access control equipment is according to website and the access-in point information preserved, and above-mentioned handover request information, judges whether this handover request goes through.
2. described access control equipment migrates to target access with site information:
If access control equipment is ratified above-mentioned handover request, then access control equipment is sent to target access with the state information of website by the escape way through encryption on the distributed network, and waits for the affirmation answer of targeted sites.Do not reply if obtain the affirmation of targeted sites at the appointed time, then retry repeatedly.If repeatedly still not obtaining the affirmation of targeted sites at the appointed time, retry replys, then graft failure.Otherwise, transplant successfully.
3. described access control equipment structure also sends the handover request response:
If described access control equipment is ratified this handover request, and site information successfully migrates to target access, the then handover request response of structure approval; Described access control equipment is a switching state with the state information updating of above-mentioned website simultaneously.
If access control equipment is negated this handover request, perhaps the site information graft failure is then constructed the handover request response negating.
Described access control equipment will be constructed good handover request response by being sent to above-mentioned current access website through the escape way of encrypting on the distributed network, and be forwarded to above-mentioned website by above-mentioned current access point by the link of setting up with above-mentioned website.
4. described access control equipment upgrades the forwarding route of above-mentioned website:
If access control equipment is ratified above-mentioned handover request, then described access control equipment is transmitted route definite object access point in the forwarding route that sends the above-mentioned website of handover request response back renewal with it.
Described access control equipment also will be issued on distributed network and transmit lastest imformation simultaneously, and the two-layer equipment on the distribution of notifications formula network upgrades converting route, with the forwarding route definite object access point of above-mentioned website.
5. target access new site connection state information more:
Described target access receives the portability information from the above-mentioned website of access control equipment, it is added in the into local user state information tabulation, and with the registered user of above-mentioned website as this basic service sets, its state is changed to pre-coupled situation.
In the 4th step, described website switches to target access;
This step may further comprise the steps again:
1. described website sends to switch and connects request
If above-mentioned website receives the handover request response from the approval of above-mentioned current access point, then cut off and the connecting of current access point, and, activate the state of this website in target access by send switching connection request to target access, communicate by letter normally.
If above-mentioned website receives the handover request response from the refusal of above-mentioned access point, then stop to switch, continue to keep connecting with the current access point.
2. described target access structure also sends switching connection response
If the switching that above-mentioned target access receives from above-mentioned website connects request, then inquire about local user's tabulation,, then its state is changed to coupled situation if there is this user who is in pre-coupled situation, and reply successful switching connection response, begin proper communication; Otherwise the switching of replying failure connects response.
3. described target access sends the finishing switching notice
Connect response if target access has sent to switch, then this target access also will send above-mentioned website finishing switching notice to described access control equipment, and the state information that the indication access control equipment upgrades above-mentioned website is normal coupled situation.
A specific embodiment of the present invention schematic diagram 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 103 is described access control equipment, and equipment 104 is distributed network equipment.Meet that the present invention describes under the control of access control equipment 103, the process that wireless network card equipment 100 switches to radio reception device 102 from radio reception device 101 as shown in Figure 3, its concrete steps are described below:
1, described wireless network card equipment 100 is set up with current only access point apparatus 101 and is connected, and described wireless access point device 101 is in the state information of the described wireless network card equipment 100 of local record;
2, described wireless access point device 101 will be sent to described access control equipment 103 storages with the state information that connects information and wireless network card equipment 100 of wireless network card equipment 100;
3, described wireless network card equipment 100 is in proper communication, and search meets the access point of switching condition;
4, wireless network card equipment 100 finds that target access equipment 102 is fit to switch, and therefore sends the handover request request to current access point equipment 101;
5, current access point equipment 101 is forwarded to access control equipment 103 judgements with the handover request request;
6, access control equipment 103 judges whether to allow this switching;
If the switching of 7 access control equipments 103 refusal wireless network card equipment, 100 applications, then structure and return the handover request response of refusal to current access point equipment 101 goes to step 8;
8, current access point equipment 101 is forwarded to wireless network card equipment 100 with the handover request response of refusal;
9, after wireless network card equipment 100 receives the handover request response of refusal, stop to switch, skip to described step 3;
If 10, access control equipment 103 allows the handover request of wireless network card equipment 100, then the state with the wireless network card equipment 100 of local record is changed to switching state, and the information of wireless network card equipment 100 is sent to target access equipment 102;
11, target access equipment 102 upgrades the state information of local wireless network card equipment 100 according to portability information;
If 12 target access equipment 102 upgrade failure, then send the transplanting response of failure to access control equipment 103;
13, access control equipment 103 receives the transplanting response of failure, then stops to switch, and skips to step 7;
If 14 target access equipment 102 upgrade successfully, then send successful transplanting response to access control equipment 103, go to step 15;
15, the handover request response of permission is constructed and returned to current access point equipment 101 to access control equipment 103;
16, current access point equipment 101 is forwarded to wireless network card equipment 100 with the handover request that allows;
If 17, access control equipment 103 allows the handover request of wireless network card equipment 100, then revise the transit route information of the wireless network card equipment 100 of local record, with its definite object access point apparatus 102;
18, access control equipment 103 is issued two layers and is delivered the table update notification on distributed network equipment 104;
19, deliver table for two layers of current access point equipment 101 and distributed network equipment 104 its this locality of renewal;
20, deliver table for two layers of target access equipment 102 its this locality of renewal;
21, wireless network card equipment 100 receives the handover request response from the permission of current access point equipment 101, then cuts off and the connecting of current access point equipment 101;
22, wireless network card equipment 100 is by monitoring sync beacon and 102 foundation of target access equipment synchronously;
23, wireless network card equipment 100 sends to switch to target access equipment 102 and connects application;
24, target access equipment 102 is in the state information of local search wireless network card equipment 100;
If 25 target access equipment 102 do not inquire the state information of the wireless network card equipment 100 that is in switching state in this locality, the switching of then returning failure connects response;
26, wireless network card equipment 100 receives the switching connection response of failure, then finishes to switch, and skips to step 1;
27, target access equipment 102 is in the state information of local search to the wireless network card equipment 100 that is in switching state, and the state that then upgrades local wireless network card equipment 100 is a coupled situation;
28, target access equipment 102 connects response to the switching that wireless network card equipment 100 returns success;
29, target access equipment 102 sends the switching state modification application to access control equipment 103, and requiring the state of modification wireless network card equipment 100 is normal coupled situation;
30, access control equipment 103 is checked the state information of local wireless network card equipment 100;
31, access control equipment 103 is not found the state information of wireless network card equipment 100, and perhaps the state information of wireless network card equipment 100 is not a switching state, then returns the switching state change response of failure;
32, access control equipment 103 finds that wireless network card equipment 100 is in switching state, and the state that then upgrades wireless network card equipment 100 is normal coupled situation;
33, the switching state change response that returns success of access control equipment 103.
Thus,, can finish switching fast, on the basis of improving switch speed, guarantee the continuity of wireless site high-level business WAP (wireless access point) by the control of access control equipment.
Should be understood that above-mentioned description to specific embodiment of the present invention is too concrete, can not therefore be interpreted as the restriction to request scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (8)
1, a kind of method of inner stations of wireless local network switching, described WLAN (wireless local area network) includes an access control equipment, is connected with a plurality of WAP (wireless access point) by a distributed network equipment; This method may further comprise the steps:
A) site search is fit to the target access of switching;
B) website structure and transmission handover request request;
C) described access control equipment carries out hand-off process;
D) website switches to target access.
2, method according to claim 1 is characterized in that, step c) is further comprising the steps of:
C1) described access control equipment judges to switch whether allow, reception is from the handover request request of website, and read target access information wherein and switch grade, according to the website of having preserved and access-in point information and above-mentioned handover request information, judge whether this handover request goes through;
C2) if described access control equipment is ratified above-mentioned handover request, described access control equipment migrates to target access with site information, and waits for the affirmation answer of targeted sites; Do not reply if obtain the affirmation of targeted sites at the appointed time, then retry repeatedly; If repeatedly still not obtaining the affirmation of targeted sites at the appointed time, retry replys, then graft failure; Otherwise, transplant successfully;
C3) if access control equipment is ratified this handover request, and site information successfully migrates to target access, the also transmission handover request response of described access control equipment structure; Described access control equipment is a switching state with the state information updating of above-mentioned website simultaneously;
If access control equipment is negated this handover request, perhaps the site information graft failure is then constructed the handover request response negating;
Access control equipment will be constructed good handover request response and will be sent to above-mentioned current access point, and be forwarded to above-mentioned website by above-mentioned current access point by the link of setting up with above-mentioned website;
When c4) described access control equipment was ratified above-mentioned handover request, described access control equipment upgraded the forwarding route of described website, and it is transmitted route definite object access point; Described access control equipment is issued on distributed network and is transmitted lastest imformation simultaneously, and the two-layer equipment on the distribution of notifications formula network upgrades converting route, with the forwarding route definite object access point of above-mentioned website
C5) target access new site connection state information more: described target access receives the portability information from the above-mentioned website of described access control equipment, it is added in the into local user state information tabulation, and, its state is changed to pre-coupled situation with the registered user of above-mentioned website as this basic service sets.
3, method according to claim 2, it is characterized in that described access control equipment is sent to the current access point by through the escape way encrypted the state information of website being sent to target access and will construct good handover request response on the distributed network.
4, method according to claim 2 is characterized in that, described step a) also comprises:
Described website with the current access point set up connects after, the current access point is in the relevant state information of local storage site, and the state information that website is correlated with backs up in described access controller;
Wireless channel around described website cycle or the aperiodic scanning, the access point that searching meets switching condition are as target access, and described website then selects one of them as target access when finding that a plurality of access points that meet switching condition exist; If this website does not have to find that the access point that meets switching condition exists, then continue hold period or aperiodic wireless channel scanning.
5, method according to claim 4 is characterized in that, described switching condition is that signal strength signal intensity or signal interference strength compare greater than certain switch window value.
6, method according to claim 4 is characterized in that, described step b) is further comprising the steps of:
B1) described website structure handover request request message comprises the identification information of additional object access point and switches grade in this message;
B2) described website sends the handover request request, and the handover request request that structure is good is sent to the current access point by the link of having set up;
B3) the handover request request is transmitted in the current access point, and described current access point is forwarded to described access control equipment with this request by the escape way through encryption on the distributed network after receiving handover request request from website.
7, method according to claim 6 is characterized in that, described identification information is the identification number of unique recognition objective access point, and described switching grade is the quantization parameter that the sign target access satisfies the switching condition degree.
8, method according to claim 7 is characterized in that, described step d) is further comprising the steps of:
D1) described website sends to switch and connects request, and cut-out connects with the current access point, and asks by sending to target access to switch to connect, and activates the state of this website in target access, communicates by letter normally; When described website receives from the handover request response of the refusal of above-mentioned access point, then stop to switch, continue to keep connecting with the current access point;
D2) described target access structure and transmission switching connection respond, and inquiry the local user tabulate, if existence is in this user of pre-coupled situation, then its state is changed to coupled situation, and the successful switching connection response of answer, begin proper communication; Otherwise the switching of replying failure connects response;
D3) this target access sends above-mentioned website finishing switching notice to described access control equipment, and the state information of indicating described access control equipment to upgrade above-mentioned website is normal coupled situation.
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| CNB2004100516914A CN100426918C (en) | 2004-09-30 | 2004-09-30 | Station switching method in WLAN |
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| CNB2004100516914A CN100426918C (en) | 2004-09-30 | 2004-09-30 | Station switching method in WLAN |
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| CNB2004100516914A Expired - Fee Related CN100426918C (en) | 2004-09-30 | 2004-09-30 | Station switching method in WLAN |
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| US8750521B2 (en) | 2009-05-14 | 2014-06-10 | China Iwncomm Co., Ltd. | Method and system for station switching when wireless terminal point completes WPI in convergent WLAN |
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| CN108770026A (en) * | 2012-02-02 | 2018-11-06 | 高通股份有限公司 | For managing mobility method and device in multi radio equipment |
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| US10237790B2 (en) | 2012-06-29 | 2019-03-19 | Samsung Electronics Co., Ltd. | Method for determining access control |
| CN103686891A (en) * | 2012-09-11 | 2014-03-26 | 华为技术有限公司 | Link switching method, controller, access point (AP) and wireless communication system |
| WO2015024164A1 (en) * | 2013-08-19 | 2015-02-26 | 华为技术有限公司 | Method, apparatus, device and system for controlling access to wireless local area network |
| CN103686895A (en) * | 2013-12-09 | 2014-03-26 | 北京邮电大学 | Switching control method, wireless network controller and access node |
| CN103686895B (en) * | 2013-12-09 | 2017-05-03 | 北京邮电大学 | Switching control method, wireless network controller and access node |
| CN107295586A (en) * | 2016-03-30 | 2017-10-24 | 华为技术有限公司 | Method, center AP and the distributed AP switched between distributed AP |
| CN107295586B (en) * | 2016-03-30 | 2020-06-26 | 华为技术有限公司 | Method for switching among distributed APs, central AP and distributed AP |
| CN108076496A (en) * | 2016-11-16 | 2018-05-25 | 北京新岸线移动多媒体技术有限公司 | The method, system and device across cell switching are realized in wireless network |
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| WO2020019925A1 (en) * | 2018-07-26 | 2020-01-30 | 华为技术有限公司 | Switching method and apparatus, and communications system |
| CN110769472A (en) * | 2018-07-26 | 2020-02-07 | 华为技术有限公司 | Switching method, device and communication system |
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