CN1536840A - Method for implementing cooperation between wireless local area network equipments - Google Patents
Method for implementing cooperation between wireless local area network equipments Download PDFInfo
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- CN1536840A CN1536840A CNA031132081A CN03113208A CN1536840A CN 1536840 A CN1536840 A CN 1536840A CN A031132081 A CNA031132081 A CN A031132081A CN 03113208 A CN03113208 A CN 03113208A CN 1536840 A CN1536840 A CN 1536840A
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Abstract
The invention refers to a method for realizing cooperation between wireless local area network devices, its AC realizes switch of primary and backup according to following scheme: when a new AC is powered on, it sends out application control power; if there has no primary control AC in the subnet, and there has no other AC which sends out application control power, then the AC becomes the primary control AC, and sends out primary control statement; if there has no primary control AC, but has other AC that sends out application control power, then all the ACs which send out application control power compete the subnet primary control power, the winner is the primary control AC, and sends out primary control statement, the other are backup control AC; if there already has primary control AC on-line in the subnet, the primary control AC sends 'application refused' to the new AC, and switches it to backup control AC. Thus, the wireless access devices accomplish the access service provided to the mobile station through information interactive, reciprocal cooperation, reciprocal control.
Description
Technical field
The present invention relates to moving communicating field, more particularly, relate to the method for the cooperation between a kind of WLAN devices, thereby provide various access services for client device.
Background technology
Current, the wireless access service provides in the data communication field, the multiple technologies scheme is arranged, comprising wireless local area network technology.The main establishing criteria of realizing WLAN (wireless local area network) is IEEE802.11 (802.11b) standard, has wherein stipulated in media control layer (MAC) and physical layer (PHY) the realization standard for radio reception device.But do not make concrete regulation for the mutual cooperation between radio reception device, for example do not make concrete regulation in the support of access device internetwork roaming for mobile site (STA).Therefore on specific implementation, very big randomness is arranged, can't satisfy the demand that some specific transactions are realized.
The IEEE802.11 standard code, access point apparatus (AP, i.e. Access Point) is connected on the distributed system (DS, i.e. Distributed System).The service that distributed system provides is called as distributed system service (DSS, be Distributed System Services), it includes: Association (association), Disassociation (disassociation promptly rolls off the production line), Reassociation (related again).Describe though in standard, have, do not make detailed explanation for the generality of distributed system.Especially for establishment, the maintenance of the topological structure of distributed system own, and regulation is not made in the realization of distributed system service.Cause each equipment manufacturers in concrete realization, for the understanding of protocol requirement, adopt off-gauge mode to come the functional requirement of some or all of realization distributed system based on separately.
In addition, the IEEE802.11 standard only explains that access point apparatus offers the basic wireless access service of mobile site, satisfies user's data transmission, the WEP on access point apparatus (wired equivalent privacy agreement) authentication etc.For some additional enhancing access services, insert etc. as PPPOE, need be between access point apparatus, that is realize on the distributed system information between supplementary equipment therefore mutual, cooperate with each other, under existing situation, these functions can't realize, professional can not providing is provided.
Summary of the invention
The technical problem to be solved in the present invention is, above-mentioned defective at prior art, the method of the cooperation between a kind of WLAN devices is provided, thereby for client device provides various access services, pass through information interaction, cooperation mutually, control mutually between its radio reception device, finish the various access services that offer mobile site jointly, as the roaming of local area network (LAN) scope, PPPOE (point-to-point protocol on the Ethernet) arbitrfary point access etc.
The present invention can be achieved through the following technical solutions, a kind of method that realizes the cooperation between the WLAN devices, wherein utilize the structure and the maintenance agreement of distributed system, by access point apparatus and access controller, in subnet, create and safeguard the distributed system information table, it is characterized in that its access controller is realized active and standby switching according to the following steps:
(1) when a new access controller powers on, described access controller sends ' control right request message ', attempts occupying the master control position of subnet;
(2) if there is not the master control access controller online in the subnet, and there is not other access controller to send ' control right request message ' simultaneously, then occupy the master control position of subnet by the access controller of described sending ' control right request message ', become the master control access controller, send ' master control assert message ' simultaneously;
(3) if there is not the master control access controller online in the subnet, but there is other access controller to send ' control right request message ' simultaneously, then send competition subnet ownership between the access controller of ' control right request message ' simultaneously by all, the competition winner switches to the master control access controller, send ' master control assert message ' simultaneously, all the other then switch to and control access controller fully;
(4) if existing master control access controller is online in the subnet, then beam back ' master control request refuse information ' to the described access controller that sends control right request, the described access controller that sends control right request is switched to control access controller fully by described online master control access controller.
In method of the present invention, when an access controller be switched to control access controller fully after: the described access controller of controlling fully sends ' solicited message table message ' to the master control access controller; Described master control access controller responds this message, beams back the distributed system information table.In addition, the described access controller of controlling fully regularly sends ' request Hot Spare message ' to the master control access controller, and described master control access controller responds this message, beams back ' response Hot Spare message '; Described master control access controller irregularly sends distributed system information table updating message to the described access controller of controlling fully.
In method of the present invention, if the master control access controller fails to beam back ' response Hot Spare message ' in the scheduled period, then compete the subnet ownership between the access controller by other online controlling fully, the competition winner switches to the master control access controller, send ' master control assert message ' simultaneously, all the other then switch to and control access controller fully.
In method of the present invention, in subnet, there is not the master control access controller online and have a plurality of access controllers to send ' control right request message ' simultaneously, perhaps when the master control access controller fails to beam back ' response Hot Spare message ' in the scheduled period, compete the subnet ownership between each access controller according to the following steps: send ' being equipped with control request refuse information ' between each access controller mutually; Each access controller is selected the access controller that master control priority is the highest, MAC Address is minimum according to the information of other access controller of collecting; According to the selection result of each access controller, select an access controller that master control priority is the highest, MAC Address is minimum as the winner; The master control position that described winner occupies subnet becomes the master control access controller, sends ' master control assert message ' simultaneously, and all the other then switch to and control access controller fully.
In method of the present invention, when a new access point apparatus powers on, accept the distributed system information table according to the following steps: after described new access point apparatus powers on, send ' solicited message table message ' to subnet; If in the scheduled period, do not receive response, then represent not have in the subnet master control access controller online, described access point apparatus is switched to free state; If receive response within the predetermined time, then represent to have in the subnet master control access controller online, described master control access controller obtains the relevant information of described access point apparatus, join in the distributed system information table, and the cloth formula system message list after will upgrading sends back to described access point apparatus.
Utilize the DSCMP agreement, in conjunction with the miscellaneous service realization flow, we can be implemented as the access service that the mobile site user provides, for example Yi Xia seamless roam service: when a mobile site was associated with second access point apparatus by first access point apparatus roaming in subnet, second access point apparatus sent ' user's roam-request messages ' to first access point apparatus; First access point apparatus responds this message, discharges the shared related resource of described mobile site; First access point apparatus sends to second access point apparatus with the relevant information of described mobile site by ' user roams response message '; Second access point apparatus is opened described mobile site user's corresponding authority according to described ' user roams response message ', and related service is carried out in the access service of described mobile site control.
As seen, the present invention utilizes the formulation of DSCMP agreement and access service message rules, can well make up distributed system and finish the distributed system service; For access device information interaction, mutual assistance provide effective support; Can satisfy the requirement of seamless roam, PPPOE access service or other new access services in the future.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the flow process that access point apparatus and access controller power under the DSCMP agreement among the present invention;
Fig. 2 is the realization flow of seamless roam among the present invention.
Embodiment
One, the structure of distributed system and maintenance
Utilize the structure and the maintenance agreement (DSCMP, i.e. Distributed SystemCreate and Maintain Protocol) of distributed system, in subnet, create and safeguard the distributed system information table.Giving a definition at DSCMP agreement framework has two kind equipments: access point apparatus and access controller (AC, i.e. Access Controller).Wherein access point apparatus serves as common access trunking, and functional requirement is fairly simple, cooperates access controller to realize the structure of distributed system and maintenance, access service provide and to user's management maintenance.
In distributed system, when powering on, compete the subnet ownership between access controller device, winner's (being called the master control access controller) monitors subnet then, distributed system is made up dynamically and safeguards the main and master control access controller of other access devices carries out interacting message in the all-ones subnet.Access point apparatus only as in the distributed system by the manager, initiatively report self information, receive the information table data that the master control access controller sends.
As shown in Figure 1, the DSCMP agreement that proposes of the present invention mainly contains the agreement control law of three parts: distributed system structure and maintenance regulation under single access controller situation, control access controller access control rule, active and standby access controller competition control law fully.
Distributed system makes up and safeguards under 1 single access controller
(1) behind the access point apparatus electrifying startup, to subnet broadcast ' solicited message table message ', all relevant informations that wherein comprise self, for example the MAC Address of this equipment, IP address, device type, master control priority information etc. are provided with the response that timer is waited for the master control access controller device simultaneously;
(2) if do not receive response, then after retransmitting certain number of times, switch to free state, wait for the startup of follow-up access controller device, and collect ' the solicited message table message ' of other access point apparatus.
(3) supposition has access controller device (as mark AC1 among the figure) electrifying startup now, to subnet broadcast ' control right request message ', and ' the master control request refuse information ' that timer is waited for the master control access controller is set;
(4) if do not receive ' master control request refuse information ', then representing does not currently have other access controller devices online, behind the certain number of times of timer expiry, switches to major state;
(5) send ' master control assert message ' to subnet, expression will be by the structure of oneself bearing distributed system and maintenance function;
(6) after online access point apparatus gets access to the online information of master control access controller, initiate again ' solicited message table message ';
(7) the master control access controller obtains the relevant information of access point apparatus, joins in the DS distributed system information table, and gives corresponding access point apparatus equipment with the information table loopback;
(8) online access point apparatus must regularly send ' online acknowledge message ' to the master control access controller, shows current still online;
(9) when the distributed system networking structure changes, the master control access controller will send ' information table updating message ' to the variation of online access point apparatus with the reflection distributed system.
2 control access controller fully inserts
(1) behind follow-up access controller device (as mark AC2 among the figure) electrifying startup, sends ' control right request message ';
(2) the master control access controller is responded ' master control request refuse information ';
(3) AC2 switches oneself state to being equipped with the control state.
(4) AC2 sends ' solicited message table message ' to the master control access controller;
(5) master control access controller loopback distributed system information table;
(6) AC2 regularly sends ' request Hot Spare message ', and timer is set awaits a response;
(7) master control access controller loopback ' response Hot Spare message ', if the master control access controller fails to respond in certain number of times, then other are in the access controller of controlling state fully and will carry out switch decision respectively, by competing winner's switching state to the master control access controller, and broadcasting ' master control assert message ', other equipment upgrade (comprising access controller and access point apparatus) information of master control access controller device synchronously;
(8) the master control access controller irregularly sends information table and updates message to and control access controller fully.
3 active and standby access controller competitions
(1), and a plurality of his access controller electrifying startups was arranged in the very short time interval if there is not access controller online in the subnet;
(2) send ' being equipped with control request refuse information ' between each access controller mutually, competition master control identity, here will be the time by the message definition of controlling refusal the other side control right request that access server sends fully for ' being equipped with control request refuse information ', to be different from the message that the master control access server sends;
(3) after certain number of times was retransmitted, AC1 was according to the information of other access controllers of collecting, carried out switch decision according to wherein master control priority, MAC Address etc., selected the access controller that priority is the highest, MAC Address is minimum;
(4) other access controller also carries out above-mentioned selection step, then according to the selection result of each access controller, selects an access controller that master control priority is the highest, MAC Address is minimum as the winner;
(5) the competition winner master control position that occupies subnet becomes the master control access controller, sends ' master control assert message ' simultaneously, and all the other then switch to and control access controller fully.
Be the realization flow of seamless roam among the present invention as shown in Figure 2, comprise the following step:
(1) mobile site association (being Association) is to access point apparatus (being the AP1 among Fig. 2);
(2) the open user's corresponding authority of AP1;
(3) AP1 carries out related service control to the access service of mobile site;
(4) user roams in subnet, and related (being Reassociation) is to new access point apparatus (being the AP2 among Fig. 2) again.
(5) AP2 gets access to the roaming information of mobile site, by the distributed system information table, finds the former association access point equipment (being AP1) of mobile site, and sends ' user's roam-request messages ' to AP1;
(6) related resource that takies of AP1 releasing ms point;
(7) AP1 sends to AP2 with the mobile site relevant information by ' user roams response message ';
(8) AP2 is according to the open user's corresponding authority of the response message of AP1;
(9) AP2 carries out related service control for the access service of mobile site.
As seen, the present invention utilizes the formulation of DSCMP agreement and access service message rules, can well make up distributed system and finish the distributed system service; For access device information interaction, mutual assistance provide effective support; Can satisfy the requirement of seamless roam, PPPOE access service or other new access services in the future.
Claims (9)
1, a kind of method that realizes the cooperation between the WLAN devices, wherein utilize the structure and the maintenance agreement of distributed system, by access point apparatus and access controller, in subnet, create and safeguard the distributed system information table, it is characterized in that its access controller is realized active and standby switching according to the following steps:
(1) when a new access controller powers on, described access controller sends ' control right request message ', attempts occupying the master control position of subnet;
(2) if there is not the master control access controller online in the subnet, and there is not other access controller to send ' control right request message ' simultaneously, then occupy the master control position of subnet by the access controller of described sending ' control right request message ', become the master control access controller, send ' master control assert message ' simultaneously;
(3) if there is not the master control access controller online in the subnet, but there is other access controller to send ' control right request message ' simultaneously, then send competition subnet ownership between the access controller of ' control right request message ' simultaneously by all, the competition winner switches to the master control access controller, send ' master control assert message ' simultaneously, all the other then switch to and control access controller fully;
(4) if existing master control access controller is online in the subnet, then beam back ' master control request refuse information ' to the described access controller that sends control right request, the described access controller that sends control right request is switched to control access controller fully by described online master control access controller.
2, method according to claim 1 is characterized in that, when an access controller be switched to control access controller fully after:
The described access controller of controlling fully sends ' solicited message table message ' to the master control access controller;
Described master control access controller responds this message, beams back the distributed system information table.
3, method according to claim 2 is characterized in that,
The described access controller of controlling fully regularly sends ' request Hot Spare message ' to the master control access controller, and described master control access controller responds this message, beams back ' response Hot Spare message ';
Described master control access controller irregularly sends distributed system information table updating message to the described access controller of controlling fully.
4, method according to claim 3, it is characterized in that, if the master control access controller fails to beam back ' response Hot Spare message ' in the scheduled period, then compete the subnet ownership between the access controller by other online controlling fully, the competition winner switches to the master control access controller, send ' master control assert message ' simultaneously, all the other then switch to and control access controller fully.
5, according to each described method among the claim 1-4, it is characterized in that, in subnet, there is not the master control access controller online and have a plurality of access controllers to send ' control right request message ' simultaneously, perhaps when the master control access controller fails to beam back ' response Hot Spare message ' in the scheduled period, compete the subnet ownership between each access controller according to the following steps:
Send ' being equipped with control request refuse information ' between each access controller mutually;
Each access controller is selected the access controller that master control priority is the highest, MAC Address is minimum according to the information of other access controller of collecting;
According to the selection result of each access controller, select an access controller that master control priority is the highest, MAC Address is minimum as the winner;
The master control position that described winner occupies subnet becomes the master control access controller, sends ' master control assert message ' simultaneously, and all the other then switch to and control access controller fully.
6, method according to claim 1 is characterized in that, when a new access point apparatus powers on, accepts the distributed system information table according to the following steps:
After described new access point apparatus powers on, send ' solicited message table message ' to subnet;
If in the scheduled period, do not receive response, then represent not have in the subnet master control access controller online, described access point apparatus is switched to free state;
If receive response within the predetermined time, then represent to have in the subnet master control access controller online, described master control access controller obtains the relevant information of described access point apparatus, join in the distributed system information table, and the cloth formula system message list after will upgrading sends back to described access point apparatus.
7, method according to claim 6, it is characterized in that, if the access point apparatus of described sending ' solicited message table message ' is received the message that the master control access controller is online after preset time, represent that then subnet has become the state that has the master control access controller online by the online state of no master control access controller, this moment, access point apparatus sent ' solicited message table message ' to subnet again, described master control access controller obtains the relevant information of described access point apparatus, join in the distributed system information table, and the cloth formula system message list after will upgrading sends back to described access point apparatus.
8, according to claim 6 or 7 described methods, it is characterized in that,
Described access accounts for equipment and regularly sends ' online acknowledge message ' to the master control access controller, shows current still online;
When the group web frame changed, described master control access controller sent distributed system information table updating message to described access point apparatus.
9, method according to claim 1 is characterized in that, when a mobile site is associated with second access point apparatus by first access point apparatus roaming in subnet,
Second access point apparatus sends ' user's roam-request messages ' to first access point apparatus;
First access point apparatus responds this message, discharges the shared related resource of described mobile site;
First access point apparatus sends to second access point apparatus with the relevant information of described mobile site by ' user roams response message ';
Second access point apparatus is opened described mobile site user's corresponding authority according to described ' user roams response message ', and related service is carried out in the access service of described mobile site control.
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| CNA031132081A CN1536840A (en) | 2003-04-11 | 2003-04-11 | Method for implementing cooperation between wireless local area network equipments |
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| CNA031132081A CN1536840A (en) | 2003-04-11 | 2003-04-11 | Method for implementing cooperation between wireless local area network equipments |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354801C (en) * | 2004-12-29 | 2007-12-12 | 大同股份有限公司 | Bidirectional management process of sequence interface for electronic type computer switcher capable of remote management |
| CN100452743C (en) * | 2006-09-14 | 2009-01-14 | 杭州华三通信技术有限公司 | Method and system for expanding 802.11 radio local network |
| CN101252498B (en) * | 2008-04-03 | 2010-08-18 | 杭州华三通信技术有限公司 | Access point, access controller and communication method thereof |
| CN101938417A (en) * | 2010-09-01 | 2011-01-05 | 中兴通讯股份有限公司 | Method for realizing configuration of main and auxiliary board cards as well as board cards |
| CN101317387B (en) * | 2005-11-28 | 2013-01-09 | 佳能株式会社 | Communication apparatus, control method for communication apparatus, and communication system |
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2003
- 2003-04-11 CN CNA031132081A patent/CN1536840A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354801C (en) * | 2004-12-29 | 2007-12-12 | 大同股份有限公司 | Bidirectional management process of sequence interface for electronic type computer switcher capable of remote management |
| CN101317387B (en) * | 2005-11-28 | 2013-01-09 | 佳能株式会社 | Communication apparatus, control method for communication apparatus, and communication system |
| CN100452743C (en) * | 2006-09-14 | 2009-01-14 | 杭州华三通信技术有限公司 | Method and system for expanding 802.11 radio local network |
| CN101252498B (en) * | 2008-04-03 | 2010-08-18 | 杭州华三通信技术有限公司 | Access point, access controller and communication method thereof |
| CN101938417A (en) * | 2010-09-01 | 2011-01-05 | 中兴通讯股份有限公司 | Method for realizing configuration of main and auxiliary board cards as well as board cards |
| WO2012028013A1 (en) * | 2010-09-01 | 2012-03-08 | 中兴通讯股份有限公司 | Implementing method for main/standby configuration of board cards, and board card |
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