CN1225942C - Method of improving mobile terminal handover switching performance in radio IP system - Google Patents

Method of improving mobile terminal handover switching performance in radio IP system Download PDF

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Publication number
CN1225942C
CN1225942C CNB2004100732311A CN200410073231A CN1225942C CN 1225942 C CN1225942 C CN 1225942C CN B2004100732311 A CNB2004100732311 A CN B2004100732311A CN 200410073231 A CN200410073231 A CN 200410073231A CN 1225942 C CN1225942 C CN 1225942C
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access node
portable terminal
certificate
authentication
message
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CN1602109A (en
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郭宏
赖晓龙
叶续茂
黄振海
张变玲
曹军
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China Iwncomm Co Ltd
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China Iwncomm Co Ltd
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Abstract

The present invention relates to a method of improving mobile terminal handover switching performance in a wireless IP system, which comprises the following steps: 1) after a mobile terminal which is not associated with any access point is associated with an access point, a WAI process is performed; 2) after the WAI process is accomplished, the access point sends an adjacent access point list of the access point to the mobile terminal; 3) the mobile terminal and each access point in the received adjacent access point list execute pre-authentication by the current access point; after the pre-authentication is accomplished, pre-authentication results and a negotiated unicast cipher key are respectively stored in a local memory by the mobile terminal and each access point in the adjacent access point list; 4) when the mobile terminal is switched to one adjacent access point AP* in the adjacent access point list from the current access point, the adjacent access point AP* informs a multicast cipher key to the mobile terminal. The present invention solves the technical problem that the mobile terminal in the wireless IP system in the background art has too long time delay in handover switching.

Description

A kind of method of improving mobile terminal handover switching performance in radio IP system
One, technical field
The present invention relates to a kind of wireless IP technology, especially a kind of method of improving mobile terminal handover switching performance.
Two, background technology
Wireless IP network (Wireless IP Network) is not only supported mobile computing, and has flexibility, agility and the extensibility of framework.It mainly is made of portable terminal MT (Mobile Terminal), access node AP (Access Point) and certificate server AS equipment such as (Authentication Server), wherein portable terminal can move arbitrarily in net, access node realizes comprising the cell management of handover, to the management and the bridging functionality of portable terminal, certificate server is realized the authentication and the internetwork roaming management of wireless access terminal.The Wireless IP network application is very extensive, and is all very useful in commerce NET, organization user's network, cell networks, remote monitoring or centralized monitor, casual network, outdoor mobile subscriber, the occasion that is difficult for that connects up and the occasion that need often change etc.
For Wireless IP network, its safety problem is more than serious many of wired ethernet.WLAN (wireless local area network) is the important way of realization of radio IP system, WLAN (wireless local area network) standard GB 15629.11 be present China in the radio IP system field the only standard that gets the Green Light.Comprised brand-new WAPI WAPI (WLAN Authentication and Privacy Infrastructure) in the standard, this security mechanism is made up of wireless local area network authentication infrastructure WAI (WLAN AuthenticationInfrastructure) and wireless local area network security foundation structure WPI (WLAN PrivacyInfrastructure) two parts, realizes discriminating and the data confidentiality to transmitting to user identity respectively.
The course of work of WAI is as follows:
1) after portable terminal was associated with access node, access node was differentiating that activating message issues portable terminal.
2) portable terminal sends to access node and inserts the discriminating request message, and message comprises the certificate of portable terminal and inserts and differentiate request time.
3) after access node is received message, with the certificate of portable terminal, insert and differentiate that request time and oneself certificate one reinstate own private key and form signature, and this signature formed request of certificate authentication message together with the certificate of certificate, access discriminating request time and the access node of portable terminal issue certificate server.
4) after certificate server is received the request of certificate authentication message that access node sends, the signing certificate of checking access node and the certificate of portable terminal.After checking was finished, structure certificate identification response message comprised that the certificate identification result information of certificate identification result information, portable terminal of access node and certificate server to the above two signature, send to access node.
5) the certificate identification result information of the portable terminal in the signature of access node authentication verification server and the judgement certificate identification response message, if certificate identification result success, then generate and insert identification response message according to the certificate identification response message, message content is identical with the certificate identification response message, send to portable terminal, enter the key agreement stage then; Otherwise remove link verification with portable terminal.
6) after portable terminal was received message, the certificate identification result information of the signature of authentication verification server and judgement access node entered the key agreement stage after the success; Otherwise remove link verification with access node.
7) portable terminal and access node carry out unicast key agreement;
8) access node is announced multicast key to portable terminal.
A radio IP system generally comprises a plurality of access nodes, constitute an extended service set ESS (Extended Service Set), when portable terminal is worked in extended service set ESS, can switch to another access node APj from the access node APi of current association, Here it is handover (Handoff).According to the regulation of WLAN (wireless local area network) standard GB 15629.11, portable terminal will authenticate when switching again, just will finish the WAI process.For voice and media stream etc. are professional continuously, the handover delay that their require is very little, generally about 50 milliseconds, and under hardware environment commonly used at present, finishing a complete WAI process time spent is approximately 1 second, and this can cause when switching communication interruption time long.
Three, summary of the invention
The invention solves the long technical problem of mobile terminal in radio IP system handover time delay in the background technology.
Technical solution of the present invention is: the present invention is a kind of method of improving mobile terminal handover switching performance in radio IP system, and its special character is: this method may further comprise the steps:
1) not related portable terminal and access node with any access node related after, carry out the WAI process;
2) finish the WAI process after, access node sends to portable terminal with it in abutting connection with access node tabulation;
3) portable terminal carries out pre-authentication with each access node in the access node tabulation of receiving by current access node.After pre-authentication was finished, portable terminal and each access node in the access node tabulation were stored the result of pre-authentication and each the comfortable this locality of singlecast key that negotiates;
4) when portable terminal switched in abutting connection with the access node tabulation certain in abutting connection with access node from current access node, this announced multicast key in abutting connection with access node to portable terminal.
Above-mentioned steps 1) portable terminal is as follows with the step of carrying out the WAI process after access node is related in:
1.1) after portable terminal was associated with access node, access node was differentiating that activating message issues portable terminal.
1.2) portable terminal is to access node transmission access discriminating request message, message comprises the certificate of portable terminal and inserts the discriminating request time.
1.3) after access node receives message, with the certificate of portable terminal, insert and differentiate that request time and oneself certificate one reinstate own private key and form signature, and this signature formed request of certificate authentication message together with the certificate of certificate, access discriminating request time and the access node of portable terminal issue certificate server.
1.4) after certificate server is received the request of certificate authentication message that access node sends, the signature of checking access node and the certificate of certificate and portable terminal.After checking was finished, structure certificate identification response message comprised that the certificate identification result information of certificate identification result information, portable terminal of access node and certificate server to the above two signature, send to access node.
1.5) signature of access node authentication verification server and the certificate identification result information of the portable terminal in the judgement certificate identification response message, if certificate identification result success, then generate and insert identification response message according to the certificate identification response message, message content is identical with the certificate identification response message, send to portable terminal, enter the key agreement stage then; Otherwise remove link verification with portable terminal.
1.6) after portable terminal received message, the signature of authentication verification server was also judged the certificate identification result information of access node, enters the key agreement stage after the success; Otherwise remove link verification with access node.
1.7) portable terminal and access node carry out unicast key agreement;
1.8) access node announces multicast key to portable terminal.
Above-mentioned steps 2) idiographic flow is as follows:
2.1) portable terminal sends in abutting connection with the access node list request to access node;
2.2) access node sends tabulating in abutting connection with access node of it to portable terminal.
Above-mentioned steps 3) idiographic flow is as follows:
3.1) portable terminal and each access node in access node tabulation carry out step 1.2)-1.7), the message in these steps all pass through the access node forwarding of the current association of portable terminal;
3.2) portable terminal and each access node in access node tabulation all store the result of pre-authentication and the singlecast key this locality that negotiates.
Above-mentioned steps 4) idiographic flow is as follows
4.1) when maybe needing to be associated to access node in portable terminal moves to the service range of certain access node in access node tabulation, portable terminal is associated with this access node;
4.2) access node is checked own buffer memory, if the pre-authentication result of portable terminal be effectively, then access node directly and portable terminal carry out multicast key notification, after multicast key notification is successful, the access of permission portable terminal; If it is invalid not having the pre-authentication result of portable terminal or result in the buffer memory, then access node sends to portable terminal and differentiates activation message, carry out step 1.1)-1.8).
The present invention is based on Chinese WLAN (wireless local area network) standard GB 15629.11, and compatible WLAN (wireless local area network) standard GB 15629.11.Safeguard by access node in abutting connection with the access node relation, portable terminal sends in abutting connection with the access node list request to access node, and from this tabulation of AP acquisition, make portable terminal need not use complicated method to go perception, guaranteed comprehensive in abutting connection with the access node relation simultaneously in abutting connection with access node.The present invention is divided into four-stage, when the handover that carries out between access node, only need carry out the process of quadravalence section.This makes that the security control process when switching needn't be through the long delay link between access node and the certificate server, the unicast key agreement that also needn't have a large amount of public key calculation consuming time, thereby when the switching of access node district takes place, handover delay has reduced the handover time delay effectively in predictable scope.
Four, description of drawings
Accompanying drawing is for using system logic structure figure of the present invention.
Five, embodiment
Referring to accompanying drawing, MT is a portable terminal, and AP is an access node, and dotted line is represented the syntople of physics, be that portable terminal can switch between the access node that has dotted line to connect, the syntople between the access node can be set up by the method for automatic study or the manual management of keeper.
Method of the present invention is:
1) not related portable terminal and current access node with any access node related after, carry out the WAI process;
2) finish the WAI process after, access node sends to portable terminal with it in abutting connection with access node tabulation;
3) portable terminal carries out pre-authentication with each access node in the access node tabulation of receiving by current access node.After pre-authentication was finished, MT and each access node in the access node tabulation were stored the result of pre-authentication and each the comfortable this locality of singlecast key that negotiates;
4) when portable terminal switched to certain in abutting connection with access node (the tabulation of adjacency access node) from current access node, this announced multicast key in abutting connection with access node to portable terminal.
Its detailed process is divided into four-stage.
Phase I:
1.1) after portable terminal was associated with access node, access node was differentiating that activating message issues portable terminal.
1.2) portable terminal is to access node transmission access discriminating request message, message comprises the certificate of portable terminal and inserts the discriminating request time.
1.3) after access node receives message, with the certificate of portable terminal, insert and differentiate that request time and oneself certificate one reinstate own private key and form signature, and this signature formed request of certificate authentication message together with the certificate of certificate, access discriminating request time and the access node of portable terminal issue certificate server.
1.4) after certificate server is received the request of certificate authentication message that access node sends, the signature of checking access node and the certificate of certificate and portable terminal.After checking was finished, structure certificate identification response message comprised that the certificate identification result information of certificate identification result information, portable terminal of access node and certificate server to the above two signature, send to access node.
1.5) signature of access node authentication verification server and the certificate identification result information of the portable terminal in the judgement certificate identification response message, if certificate identification result success, then generate and insert identification response message according to the certificate identification response message, message content is identical with the certificate identification response message, send to portable terminal, enter the key agreement stage then; Otherwise remove link verification with portable terminal.
1.6) after portable terminal received message, the signature of authentication verification server was also judged the certificate identification result information of access node, enters the key agreement stage after the success; Otherwise remove link verification with access node.
1.7) portable terminal and access node carry out unicast key agreement;
1.8) access node announces multicast key to portable terminal.
Second stage:
2.1) portable terminal sends in abutting connection with the access node list request to access node;
2.2) access node sends to portable terminal and tabulate in abutting connection with access node.
Phase III:
3.1) portable terminal and each access node in access node tabulation carry out step 1.2)-1.7), the message in these steps all pass through the access node forwarding of the current association of portable terminal;
3.2) portable terminal and each access node in access node tabulation all store the result of pre-authentication and the singlecast key this locality that negotiates.
The quadravalence section
4.1) when maybe needing to be associated in portable terminal moves to the service range of certain access node in access node tabulation, portable terminal is associated with this access node;
4.2) access node is checked own buffer memory, if the pre-authentication result of portable terminal be effectively, then access node directly and portable terminal carry out multicast key notification, after multicast key notification is successful, the access of permission portable terminal; If it is invalid not having the pre-authentication result of portable terminal or result in the buffer memory, then access node sends to portable terminal and differentiates activation message, carry out step 1.1)-1.8).

Claims (5)

1, a kind of method of improving mobile terminal handover switching performance in radio IP system, it is characterized in that: this method may further comprise the steps:
1) not related portable terminal and access node with any access node related after, carry out the WAI process;
2) finish the WAI process after, access node sends to portable terminal with it in abutting connection with access node tabulation;
3) portable terminal carries out pre-authentication with each access node in the access node tabulation of receiving by current access node, after pre-authentication was finished, portable terminal and each access node in the access node tabulation were stored the result of pre-authentication and each the comfortable this locality of singlecast key that negotiates;
4) when portable terminal switched in abutting connection with the access node tabulation certain in abutting connection with access node from current access node, this announced multicast key in abutting connection with access node to portable terminal.
2, the method for improving mobile terminal handover switching performance in radio IP system according to claim 1 is characterized in that: portable terminal is as follows with the step of carrying out the WAI process after access node is related in the described step 1):
1.1) after portable terminal was associated with access node, access node was differentiating that activating message issues portable terminal;
1.2) portable terminal is to access node transmission access discriminating request message, message comprises the certificate of portable terminal and inserts the discriminating request time;
1.3) after access node receives message, with the certificate of portable terminal, insert and differentiate that request time and oneself certificate one reinstate own private key and form signature, and this signature formed request of certificate authentication message together with the certificate of certificate, access discriminating request time and the access node of portable terminal issue certificate server;
1.4) after certificate server is received the request of certificate authentication message that access node sends, the signature of checking access node and the certificate of certificate and portable terminal, after checking is finished, structure certificate identification response message, comprise that the certificate identification result information of certificate identification result information, portable terminal of access node and certificate server to the above two signature, send to access node;
1.5) signature of access node authentication verification server and the certificate identification result information of the portable terminal in the judgement certificate identification response message, if certificate identification result success, then generate and insert identification response message according to the certificate identification response message, message content is identical with the certificate identification response message, send to portable terminal, enter the key agreement stage then, otherwise the link verification of releasing and portable terminal;
1.6) after portable terminal received message, the signature of authentication verification server was also judged the certificate identification result information of access node, enters the key agreement stage after the success, otherwise remove the link verification with access node;
1.7) portable terminal and access node carry out unicast key agreement;
1.8) access node announces multicast key to portable terminal.
3, the method for improving mobile terminal handover switching performance in radio IP system according to claim 1 and 2, it is characterized in that: idiographic flow described step 2) is as follows:
2.1) portable terminal sends in abutting connection with the access node list request to access node;
2.2) access node sends tabulating in abutting connection with access node of it to portable terminal.
4, the method for improving mobile terminal handover switching performance in radio IP system according to claim 1 and 2, it is characterized in that: the idiographic flow of described step 3) is as follows:
3.1) portable terminal and each access node in access node tabulation carry out step 1.2)-1.7), the message in these steps all pass through the access node forwarding of the current association of portable terminal;
3.2) portable terminal and each access node in access node tabulation all store the result of pre-authentication and the singlecast key this locality that negotiates.
5, the method for improving mobile terminal handover switching performance in radio IP system according to claim 1 and 2, it is characterized in that: the idiographic flow of described step 4) is as follows:
4.1) when maybe needing to be associated to access node in portable terminal moves to the service range of certain access node in access node tabulation, portable terminal is associated with this access node;
4.2) access node is checked own buffer memory, if the pre-authentication result of portable terminal be effectively, then access node directly and portable terminal carry out multicast key notification, after multicast key notification is successful, the access of permission portable terminal; If it is invalid not having the pre-authentication result of portable terminal or result in the buffer memory, then access node sends to portable terminal and differentiates activation message, carry out step 1.1)-1.8).
CNB2004100732311A 2004-11-04 2004-11-04 Method of improving mobile terminal handover switching performance in radio IP system Active CN1225942C (en)

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CN1964259B (en) * 2005-11-07 2011-02-16 华为技术有限公司 A method to manage secret key in the course of switch-over
CN101155396B (en) * 2006-09-25 2012-03-28 联想(北京)有限公司 Terminal node switching method
US8644206B2 (en) 2007-08-17 2014-02-04 Qualcomm Incorporated Ad hoc service provider configuration for broadcasting service information
US20090047964A1 (en) * 2007-08-17 2009-02-19 Qualcomm Incorporated Handoff in ad-hoc mobile broadband networks
CN101442773B (en) * 2007-11-21 2011-08-17 上海寰创通信科技有限公司 Rapid switching method for wireless netted network
CN101222772B (en) * 2008-01-23 2010-06-09 西安西电捷通无线网络通信有限公司 Wireless multi-hop network authentication access method based on ID
CN101222325B (en) 2008-01-23 2010-05-12 西安西电捷通无线网络通信有限公司 Wireless multi-hop network key management method based on ID
CN101527908B (en) 2009-04-08 2011-04-20 中兴通讯股份有限公司 Method for pre-identifying wireless local area network terminal and wireless local area network system
CN101902722B (en) * 2009-05-25 2013-05-08 南京中兴软件有限责任公司 Method for realizing roaming authentication of mobile terminal in wireless local area network and access point
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CN101702802B (en) * 2009-11-03 2012-10-17 中兴通讯股份有限公司 Mobile terminal handover method
CN102083065B (en) * 2011-02-14 2013-11-13 宇龙计算机通信科技(深圳)有限公司 Method and device for managing certificates
CN102164368B (en) * 2011-03-07 2016-09-07 北京新岸线移动多媒体技术有限公司 A kind of method accessing WLAN and communication system
CN105050146A (en) * 2015-05-28 2015-11-11 上海精吉通讯技术有限公司 Roaming switching method

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