CN1913466A - Switchover method of radio local network - Google Patents
Switchover method of radio local network Download PDFInfo
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- CN1913466A CN1913466A CN 200510090079 CN200510090079A CN1913466A CN 1913466 A CN1913466 A CN 1913466A CN 200510090079 CN200510090079 CN 200510090079 CN 200510090079 A CN200510090079 A CN 200510090079A CN 1913466 A CN1913466 A CN 1913466A
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Abstract
This invention discloses a switch method in a WLAN including: 1, a station selects a target access point, 2, the station structures synchronous application request to be sent to the current access point, 3, the current access point forwards the request to the target access point, 4, the target access point receives the request to constructure synchronous response information and sends it to the current access point, 5, which feeds back the response information to the station, 6, if the station receives correct request response information, it first of all cuts off connection of the current access point, then switches to the work channel of the target access point and sets up synchronization with the target access point based on the response information, otherwise, it returns back to the first step, 7, the station accesses the target access point to finish the switch.
Description
Technical field
The present invention relates to the wireless local area network (WLAN) system in the wireless communication field, especially relate to the method that switches to the Target Wireless access point at website from the current wireless access point.
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, and as shown in Figure 1, the expansion service group is made of one or more basic service sets and the compartment system that connects these basic service sets.Each basic service sets comprises a WAP (wireless access point) (being called for short access point later on) equipment and has set up wireless site (the being called for short website later on) equipment that is connected with several and this access point.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.Website may be for a certain reason set up and being connected of another one access point by association process once more after connecting with a current access point, and cut-out and current access point is related, and this process is called the interior switching of radio local network environment.
The changing method of present WLAN (wireless local area network) mainly contains following two kinds:
Method one:
1, website selected target access point.The selected of target access can be undertaken by website scan empty choma border, also can be by current access point intended target website.
2, website cuts off and being connected of current access point.
3, website and target access are set up synchronously.With target access dual mode, active synchronization and passive and synchronous arranged synchronously.Active synchronization is exactly website by sending initiatively that probe request is obtained the synchronizing information of target access and is synchronous with target access.It is passive and synchronous that to be exactly website obtain synchronizing information that target access periodically sends and synchronous with target access by wait.
4, website and target access authenticate.Because the open broadcast characteristic of wireless network itself, so will carry out authentication between website and the access point.
5, website and target access reconnect.The process that reconnects is exactly that website sends the request that reconnects to target access, and target access is received the correct process that reconnects response of responding in request back that reconnects.
Method two:
1, website selected target access point.The selected of target access can be undertaken by website scan empty choma border, also can be by current access point intended target website.
2, website carries out pre-authentication by current access point and target access.Pre-authentication is exactly not cut off current connection, inserts the process of carrying out authentication by current access point and target.
3, website cuts off and being connected of current access point.
4, website and target access are set up synchronously.With target access dual mode, active synchronization and passive and synchronous arranged synchronously.Active synchronization is exactly website by sending initiatively that probe request is obtained the synchronizing information of target access and is synchronous with target access.It is passive and synchronous that to be exactly website obtain synchronizing information that target access periodically sends and synchronous with target access by wait.
5, website and target access reconnect.The process that reconnects is exactly that website sends the request that reconnects to target access, and target access is received the correct process that reconnects response of responding in request back that reconnects.
From foregoing, can obtain, time of service interruption is to cut off with the current access point to be connected in the handoff procedure in the method one, synchronous with target access, carry out authentication with target access, insert the summation that reconnects the needed time of these processes with target.Method two has reduced break period professional in a part of handoff procedure by the mode of not cutting off situation about being connected with the current access point and target access and carrying out pre-authentication, but there are some researches show, in the handoff procedure most of the time consume with the synchronous process of target access in, therefore, the common drawback of above-mentioned two kinds of methods is that the time-delay of switching is long, thereby can't guarantee the continuity of website high-level business.
Summary of the invention
Purpose of the present invention is exactly to propose the changing method that a kind of handoff delay is short, can guarantee the successional WLAN (wireless local area network) of high-level business as far as possible.
Changing method in a kind of WLAN (wireless local area network) comprises the following steps:
The first step: website selected target access point;
Second step: the application synchronously of website structure is asked and is sent to the current access point by current link;
The 3rd step: the current access point will apply for synchronously that by distributed system request is transmitted to target access;
The 4th step: target access receives application request synchronously, and structure application is synchronously receiveed the response and it is sent to the current access point by distributed system;
The 5th step: will apply for synchronously receiveing the response and return to website in the current access point;
The 6th step: if website receives correct synchronous application request response, then cut off earlier and being connected of current access point, switch to the channel of target access work and synchronous with target access foundation then according to the content in the response message; Otherwise return the first step;
The 7th step: website inserts target access, and switching is finished.
The changing method of the WLAN (wireless local area network) that the present invention proposes carries out with target access under the situation of not interrupting current connection synchronously.Like this, in synchronous process, upper-layer service is unbroken, after website and target access have been set up correct synchronizing information, just can cut off to disconnect with current access and is connected.The method that adopts with current switching compares, and the method applied in the present invention has obviously reduced the time of link down in handoff procedure, has improved the tenability of delay requirement than higher business, has guaranteed the continuity of high-level business most possibly.
Description of drawings
Fig. 1 is the expansion service group structural representation of WLAN (wireless local area network);
Fig. 2 is a schematic network structure of the invention process;
Fig. 3 is the flow chart of the method for proposition of the present invention.
Embodiment
Further specify implementation process of the present invention below in conjunction with accompanying drawing.
Fig. 1 had carried out explanation in background technology.
Fig. 2 is a schematic network structure of the invention process, as shown in Figure 2, website is the terminal equipment of compliant wireless local area networks standard IEEE 802.11, the current access point is the access point apparatus that website was connected before switching took place, target access is that the access point apparatus that the back website is connected takes place in switching, and compartment system equipment is for making up the required equipment of compartment system.
Fig. 3 is the flow chart of the changing method that proposes of the present invention, and as shown in Figure 3, detailed implementation process of the present invention is as follows:
1, website and current only access point connect;
2, website is selected a target access in proper communication, and this access point may obtain by the environment of eating dishes without rice or wine around website oneself scanning, also may be obtained by alternate manner.The selection of target access has multiple reason, may be because website be better than the access point of current access point by the environmental scanning discovery condition of eating dishes without rice or wine, and also may be owing to reasons such as load balancing have been accepted the access point that indication requires to insert appointment.
3, website will be set up synchronously with target access, therefore sends the synchronous application request that has the target access sign to the current access point, and this step comprises again:
(a), website structure application request message synchronously, in this message, need to comprise the rate information that identification information, local time stamp and the website of message unique identification information, target access are supported.The message unique identification information is used for unique identification application request message synchronously; The target access identification information is the identification number of unique recognition objective access point; Clock value when local time stamp is exactly this locality transmission message; The rate information that website is supported is exactly receptible all data transfer rates of this website.
(b), website will be constructed good synchronous application request and will be sent to the current access point by current link.Website sends application request synchronously and begins to wait for the response of application simultaneously, if do not obtain within a certain period of time responding, then retransmits application request synchronously.Repeatedly still do not obtain responding if repeat to have sent, should return first step selected target access point again.
4, the current access point should apply for synchronously that request was transmitted to target access.The current access point is sent to target access with the synchronous application request of website by distributed network, and waits for the answer of target access.If do not obtain the answer of target access at the appointed time, then notify website to resend synchronous application request message.
5, target access is handled application request synchronously; This step may further comprise the steps again:
(c), target access receives application request message synchronously
(d), target access makes up and applies for synchronously receiveing the response, application is synchronously receiveed the response and be comprised following content: the beacon frame cycle (Beacon Interval), the Echo Frame timestamp, service groups sign (SSID), the data transfer rate of support, the frequency parameter collection, the direct sequence spread spectrum parameter set, uncontested parameter set, ability information, the request message unique identification, the claim frame timestamp.
6, the target access synchronous application request well of will constructing is receiveed the response and is sent to the current access point;
7, the current access point will apply for synchronously that the request response is transmitted to website.After the current access point receives that synchronous application that target access is returned is receiveed the response, this message is sent to the website that proposes with this corresponding synchronous application request of receiveing the response.
If 8 websites are found the synchronization request failure with target access, the reason of failure has two kinds of possibilities, one may be not receive synchronous application request response in the regular hour, and another may be that the synchronous application request response of receiving is wrong, then returns step 2;
If the synchronous application request success of 9 websites and target access, then website cuts off earlier and being connected of current access point, and content and the target access foundation responded with the working channel of own working channel converting into target access point and by application request synchronously are synchronous.
10, after website and target access foundation synchronously, website is in same channel with target access, just can be connected to target access.
Claims (5)
1, the changing method in a kind of WLAN (wireless local area network) is characterized in that comprising the following steps:
The first step: website selected target access point;
Second step: the application synchronously of website structure is asked and is sent to the current access point by current link;
The 3rd step: the current access point will apply for synchronously that by distributed system request is transmitted to target access;
The 4th step: target access receives application request synchronously, and structure application is synchronously receiveed the response and it is sent to the current access point by distributed system;
The 5th step: will apply for synchronously receiveing the response and return to website in the current access point;
The 6th step: if website receives correct synchronous application request response, then cut off earlier and being connected of current access point, switch to the channel of target access work and synchronous with target access foundation then according to the content in the response message; Otherwise return the first step;
The 7th step: website inserts target access, and switching is finished.
2, method according to claim 1 is characterized in that described synchronous application request message comprises the rate information that identification information, local time stamp and the website of message unique identification information, target access are supported.
3, method according to claim 1 is characterized in that website sends application request synchronously and begins to wait for the response of application simultaneously in described second step, if do not obtain within a certain period of time responding, then retransmits application request synchronously; Repeatedly still do not obtain responding if repeat to have sent, then return the first step.
4, method according to claim 1, it is characterized in that in described the 3rd step, the current access point will apply for asking being transmitted to the answer of waiting for target access after the target access synchronously, if do not obtain the answer of target access at the appointed time, then notify website to resend synchronous application request message.
5, method according to claim 1, it is characterized in that the content that described synchronous application is receiveed the response comprises: the beacon frame cycle, the Echo Frame timestamp, service groups sign, the data transfer rate of support, the frequency parameter collection, the direct sequence spread spectrum parameter set, uncontested parameter set, ability information, the request message unique identification, the claim frame timestamp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510090079 CN1913466A (en) | 2005-08-12 | 2005-08-12 | Switchover method of radio local network |
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| CN 200510090079 CN1913466A (en) | 2005-08-12 | 2005-08-12 | Switchover method of radio local network |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009089749A1 (en) * | 2007-12-29 | 2009-07-23 | Huawei Technologies Co., Ltd. | A handover method, apparatus and system between aps |
| CN101257429B (en) * | 2008-04-14 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for realizing network roaming |
| CN103634860A (en) * | 2012-08-24 | 2014-03-12 | 西门子公司 | Fast switching method in wireless communication system, system and client |
| CN104038975A (en) * | 2013-03-04 | 2014-09-10 | 杭州华三通信技术有限公司 | Method and apparatus for rapidly establishing link |
| CN105163316A (en) * | 2015-07-31 | 2015-12-16 | 腾讯科技（深圳）有限公司 | Method and device for accessing Wi-Fi hotspot |
| WO2016138753A1 (en) * | 2015-03-05 | 2016-09-09 | 中兴通讯股份有限公司 | Handover delay measuring method, base station and system |
| CN106604280A (en) * | 2017-01-06 | 2017-04-26 | 国网新疆电力公司电力科学研究院 | Handover method of wireless network |
| CN103634860B (en) * | 2012-08-24 | 2018-02-09 | 西门子公司 | Fast switch over method, system and client in wireless communication system |
-
2005
- 2005-08-12 CN CN 200510090079 patent/CN1913466A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009089749A1 (en) * | 2007-12-29 | 2009-07-23 | Huawei Technologies Co., Ltd. | A handover method, apparatus and system between aps |
| CN101472306B (en) * | 2007-12-29 | 2012-06-20 | 华为技术有限公司 | Method, system and device for switching between APs |
| CN101257429B (en) * | 2008-04-14 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for realizing network roaming |
| CN103634860A (en) * | 2012-08-24 | 2014-03-12 | 西门子公司 | Fast switching method in wireless communication system, system and client |
| CN103634860B (en) * | 2012-08-24 | 2018-02-09 | 西门子公司 | Fast switch over method, system and client in wireless communication system |
| CN104038975A (en) * | 2013-03-04 | 2014-09-10 | 杭州华三通信技术有限公司 | Method and apparatus for rapidly establishing link |
| WO2016138753A1 (en) * | 2015-03-05 | 2016-09-09 | 中兴通讯股份有限公司 | Handover delay measuring method, base station and system |
| CN105992268A (en) * | 2015-03-05 | 2016-10-05 | 中兴通讯股份有限公司 | Switching time delay measuring method, base station and system |
| CN105163316A (en) * | 2015-07-31 | 2015-12-16 | 腾讯科技（深圳）有限公司 | Method and device for accessing Wi-Fi hotspot |
| CN106604280A (en) * | 2017-01-06 | 2017-04-26 | 国网新疆电力公司电力科学研究院 | Handover method of wireless network |
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