CN100551123C - A kind of terminal switching method and system - Google Patents
A kind of terminal switching method and system Download PDFInfo
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- CN100551123C CN100551123C CNB2006100757074A CN200610075707A CN100551123C CN 100551123 C CN100551123 C CN 100551123C CN B2006100757074 A CNB2006100757074 A CN B2006100757074A CN 200610075707 A CN200610075707 A CN 200610075707A CN 100551123 C CN100551123 C CN 100551123C
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Abstract
The present invention relates to a kind of in WiMAX MIPv6 terminal switching method and system.This method comprises: A, terminal are administered subnet information to the target access service network gateway of service access service network gateway request target Base Station Identification correspondence; B, service access service network gateway basis and the mutual access service network gateway administration subnet information of first network element are obtained the corresponding target access service network gateway administration subnet information of described target BS sign; C, the terminal target access service network gateway administration subnet information corresponding according to described target BS sign, the configuration target forward address is finished handover operation.The invention also discloses a kind of terminal switching system.The present invention has provided and has served the method that ASN-GW obtains the relevant T-ASN-GW administration of switching subnet information in the quick switching.For switching fast, practical application MIPv6 in the WiMAX system provides precondition.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of in WiMAX MIPv6 terminal switching method and system.
Background technology
Although with Internet Protocol the 4th edition (IPv4 IP version 4) is that the internet of core technology has obtained great success, yet because the anxiety of IPv4 address resource has directly limited further developing that the IP technology is used.And the develop rapidly of mobile at present and broadband technology is to the demand sharp increase of IP address, though for satisfying technology such as inter-domain routing (CIDR Classless Inter Domain Routing) that this demand proposed no class, network address translation (NAT Net Address Translation), combined address, the anxiety that they can only respite IPv4 address.And internet engineer's task groups (IETF Internet EngineeringTask Force) has proposed Next Generation Internet agreement---Internet Protocol sixth version (IPv6IP version 6) in the nineties in 20th century, and IPv6 has been acknowledged as the following upgraded version of IPv4 at present.The IPv6 improvement of essence the most is that address size with former IPv4 is increased to 128 by 32, thereby has brought almost unlimited address space.In addition, IPv6 also adopts hierarchical address pattern, efficient IP packet header, service quality, host address to dispose automatically, authenticate and many technology such as encryption.
Wherein for realize mobile node still can be smoothly under situation of movement and the external world communicate, we use Mobile IP, i.e. mobile IP technology.As shown in Figure 1, Fig. 1 is a MIPv6 operation principle schematic diagram, as seen from the figure, the basic principle of mobile IP be mobile node except having a fixed ip address---HoA address (HoA Home Address), also have the another one temporary ip address at the field network that moves to recently---Care-of Address (CoA Care-of Address), set up the routing relation of corresponding relation and the home network and the field network of HoA address and CoA address by certain network mechanism, thus reach make mobile node when its network transformation with the Correspondent Node that is positioned at other networks (Corresponding Node) between unbroken purpose of communicating by letter.And mobile IP v 6 (MIPv6 Mobile IP version 6) is based on the mobile IP technology of IPv6 agreement, and it need not outer agency, support Route Optimization and then avoids alternate route and make full use of neighbours' discovery feature and the IPv6 extension header; The relative MIPv4 of the travelling performance of MIPv6 has had significant improvement.Come simply to introduce the working mechanism of MIPv6 below:
1, mobile node finds that by the IPv6 router message determines current position;
2, mobile node uses the configuration CoA address that the automatic configuration mechanism in IPv6 address is obtained foreign link;
3, mobile node lands to local agent, notifies its CoA address;
4, mobile node is also notified its CoA address to some CN;
5, other main frame can be ignored the CoA address of mobile node, and the moving IPv4 of image drift is the same, and packet is mail to the local network of mobile node, and local agent is forwarded to the CoA address of mobile node by tunnel Jiang Bao;
6, know mobile node CoA communication host also IP available v6 route extension header directly bag is issued mobile node;
7, mobile node uses the CoA address as the source address that sends bag.
WiMAX (Worldwide Interoperability for Microwave Access), i.e. the interoperability of global microwave system, the whole network of WiMAX is mainly by forming with the lower part:
1, terminal (MS, Mobile Subscriber Station): the user uses this devices accessing WiMAX network;
2, access service network (ASN Access Service Network): ASN is defined as the network function set that the WiMAX terminal provides the wireless access service.ASN has comprised base station (BS Base Station) and access service network gateway (ASN-GW ASN Gateway) network element.Wherein the major function of BS network element is: provide the L2 of BS and MS to be connected, RRM or the like; The major function of ASN-GW network element is: for MS authentication function provides client functionality, provide for MS and switch in relaying (Relay) function (as IP address assignment), ASN of L3 information etc.
3, connect service network ((CSN Connectivity Service Network)): CSN is defined as the WiMAX terminal IP is provided Connection Service.The major function that CSN provided is: the IP address assignment of MS, Internet insert, authentication accounting server (AAA server) or authentication charging proxy server (AAAproxy), based on user's authorization control etc.
Above-mentioned three partial logic inter-entity communicate by the interface from R1 to R6, each network element and interface relationship as shown in Figure 2, Fig. 2 is the basic structure of WiMAX system.
When making MS be positioned at field network, it keeps not interrupting with communicating by letter of opposite end communication node (CN Correspondent Node), and we apply to the WiMAX system to reach above-mentioned target with the mobile IP v 6 technology here.Move to another ASN-GW and work as MS from an ASN-GW,, need switch fast for reducing or eliminating the delay that MS sets up new communication path.The purpose of switching is how to make MS send packet as early as possible after being connected to target ASN-GW (T-ASN-GW) fast, and how to send packet to it as early as possible after T-ASN-GW detects adhering to of MS.In order to reach above-mentioned target, switching comprises following several respects fast:
1, move to detect: in advance or moving of finding early that MS takes place, and the T-ASN-GW that will move to;
2, IP address configuration: CoA address relevant information obtaining and disposing in new network;
3, the position is upgraded: the T-ASN-GW in T-CoA address and the objective network is registered, with the S-CoA of S-ASN-GW cancellation with its registration, and setting up getting in touch between T-CoA, S-CoA address and T-ASN-GW, the S-ASN-GW between two actions.
Can make MS detect the network that it has moved to another ASN-GW (T-ASN-GW) administration rapidly by quick switching, simultaneously with situation that the subnet of present place ASN-GW (S-ASN-GW) administration is connected under, set up related with the new prefix information of subnet.Its key component is exactly the CoA (TCoA) in present place network configuration T-ASN-GW administration network fortunately, so that after being connected to T-ASN-GW, MS can utilize the T-COA and the external world to carry out communication immediately.
The route requests of prior art by agent advertisement/act on behalf of route announcement (RtSolPr/PrRtAdv) message obtain subnet information that T-ASN-GW administers quick switching process as shown in Figure 3, may further comprise the steps:
S310, MS receive switch indicating information, comprise in this message to permit the corresponding BS ID of BS (being designated as T-BS) (being designated as T-BS ID) that MS switches to.
More than one of the T-BS possibility that comprises in this step, its corresponding T-ASN-GW also may be more than one.
S320, for the information of the subnet that ASN-GW administers of resolving the BSID correspondence, so that before switching, configure T-CoA at T-ASN-GW administration subnet, MS sends RtSolPr message (wherein comprising T-BSID) to S-ASN-GW, asks the relevant information (as link layer address, link prefix etc.) of subnet that its T-ASN-GW that issues the T-BSID correspondence administers.
S330, after S-ASN-GW receives this message, go out the relevant information (as link layer address, link prefix etc.) that the pairing T-ASN-GW of BSID administers subnet according to the grasp information searching that closes on ASN-GW, then above-mentioned information-bearing is sent to MS in PrRtAdv message.
After S340, MS received PrRtAdv message, the configuration information according to the T-ASN-GW administration subnet that is wherein comprised disposed the T-CoA of oneself.
S350, remaining switch step, little with content association that the present invention pays close attention to, just do not give unnecessary details here.
In the above-mentioned switching flow; how S-ASN-GW does not obtain the relevant programme of the information of subnet that ASN-GW administers on every side; and only shown in this flow process that S-ASN-GW only need obtain the information that minority is closed on ASN-GW; yet situation as shown in Figure 4 appears in regular meeting in practice, i.e. the physical distance of S-ASN-GW and T-ASN-GW far (may be because other situations cause) before switching.With respect to S-ASN-GW, T-ASN-GW may not belong in its ASN-GW scope of closing on, if its grasp closes on ASN-GW information, S-ASN-GW may just can't be known the relevant information of subnet that T-ASN-GW administers so.This shows that S-ASN-GW not only will know the information of its adjacent ASN-GW administration subnet, need also simultaneously to know that any target ASN-GW that may switch to MS administers the information of subnet.Therefore the scheme that S-ASN-GW obtains T-ASN-GW in the prior art is defective.
Summary of the invention
The invention provides a kind of terminal switching method and system, in order to remedy the defective that S-ASN-GW in the prior art obtains the T-ASN-GW scheme.
The inventive method comprises:
A kind of in WiMAX MIPv6 terminal switching method, comprising:
A, terminal are administered subnet information to the target access service network gateway of service access service network gateway request target Base Station Identification correspondence;
B, service access service network gateway basis and the mutual access service network gateway administration subnet information of first network element are obtained the corresponding target access service network gateway administration subnet information of described target BS sign;
C, the terminal target access service network gateway administration subnet information corresponding according to described target BS sign, the configuration target forward address is finished handover operation.
Described first network element stores access service network gateway administration subnet information in the described access service network.
Described first network element is announced each access service network gateway administration subnet information to described access service network gateway.
Described access service network gateway stores each access service network gateway administration subnet information in the described access service network that described first network element sends.
Among the described step B, described target access service network gateway is searched each access service network gateway administration subnet information in the described access service network of its storage, obtains the corresponding target access service network gateway administration subnet information of described target BS sign.
Among the described step B, if described target access service network gateway does not find the corresponding target access service network gateway administration subnet information of described target BS sign, then to the described information of the described first network element request.
The target access service network gateway administration subnet information that described target BS sign is corresponding includes but not limited to one of following content or combination:
The link prefix of the Base Station Identification of access service network gateway sign, the IPv6 address of access service network gateway, base station that access service network gateway is administered and access service network gateway administration subnet.
Adopt IP datagram literary composition message or WiMAX management plane interacting message information between the described target access service network gateway basis and first network element.
Described first network element can be access service network gateway or access service network gateway agent unit.
System of the present invention comprises:
A kind of in WiMAX MIPv6 terminal switching system, be included as serving BS and service access service network gateway that terminal provides access, and terminal target BS and the target access service network gateway desiring to switch to, also comprise:
First network element is arranged at described access service network, stores in the described access service network access service network gateway administration subnet information, and access service network gateway administration subnet information in the mutual described access service network between the described access service network gateway.
Described access service network gateway also is provided with:
Access service network gateway administration subnet information storage unit is used for receiving each access service network gateway administration subnet information of described access service network that described first network element sends.
Described first network element can be the agent unit of access service network gateway or access service network gateway.
The technology of the present invention has provided a kind of ASN-GW that serves and has obtained the method for switching relevant T-ASN-GW administration subnet information in WiMAX MIPv6 switches fast.Filled up the defective that present S-ASN-GW can't obtain the T-ASN-GW administration subnet information that may switch to, provide precondition for practical application MIPv6 in the WiMAX system switches fast.
Description of drawings
Fig. 1 is a MIPv6 operation principle schematic diagram in the prior art;
Fig. 2 is a WiMAX system configuration schematic diagram in the prior art;
Fig. 3 is a WiMAX MIPv6 workflow schematic diagram in the prior art;
Fig. 4 is a corresponding ASN-GW physical distance situation key diagram far away before and after switching in the prior art;
Fig. 5 is a system configuration schematic diagram of the present invention;
Fig. 6 is a schematic flow sheet of the present invention;
Fig. 7 is the schematic flow sheet of the embodiment of the invention.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
The present invention has provided a kind of method of obtaining relevant ASN-GW administration subnet information at WiMAX MIPv6 service ASN-GW.Can obtain the subnet information of the relevant T-ASN-GW administration that MS may switch to by this method S-ASN-GW, the precondition of creating for the quick switching that realizes MS.
In the prior art because the distance between each ASN-GW is different, may be before switching the physical distance of S-ASN-GW and T-ASN-GW far, with respect to S-ASN-GW, T-ASN-GW may not belong in its ASN-GW scope of closing on, and as shown in Figure 4, promptly is the schematic diagram of this kind situation.Like this, if its grasp closes on ASN-GW information, S-ASN-GW may just can't be known the relevant information of subnet that T-ASN-GW administers so.For this reason, the present invention can be provided with a network element, and its grasp has the information of (its compass of competency in) all ASN-GW administration subnets, can guarantee that by this network element each ASN-GW can know the information of other ASN-GW administration subnet.
As shown in Figure 5, be terminal switching system structural representation of the present invention, as seen from the figure, this switched system comprises:
Being included as MS510 provides the S-BS520 and the S-ASN-GW540 of access, and the MS510 T-BS530 and the T-ASN-GW550 that desire to switch to, also comprises:
First network element 560 can be arranged at ASN, also can be arranged at other positions, stores among the described ASN ASN-GW administration subnet information, and ASN-GW administration subnet information among the mutual described ASN between the described ASN-GW;
Described ASN-GW also is provided with:
ASN-GW administers subnet information storage unit 541, is used for receiving described first network element and sends out each ASN-GW administration subnet information of the 560 described ASN that send.
Described first network element 560 can be the agent unit of ASN-GW or ASN-GW, can be positioned at ASN, also can be positioned at other networks, and its function can be a storage ASN-GW administration subnet information, and the above-mentioned information of each ASN-GW is managed.
In said system, first network element 560 is grasped the information that (in its compass of competency) all ASN-GW administration subnets are arranged, and S-ASN-GW can obtain corresponding information from first network element by dual mode:
1, S-ASN-GW can receive that first network element periodically sends the up-to-date information of all ASN-GW administration subnets of (in its compass of competency) to each ASN-GW;
2, as S-ASN-GW during, send corresponding analysis request, obtain the information of the ASN-GW administration subnet of BS ID correspondence from first network element to first network element at the BS ID that wanting of receiving that MS sends resolved.
In addition, ASN-GW can have the storage capacity to the ASN-GW information obtained (or having configured), the ASN-GW information known (or having configured) is stored in ASN-GW administration subnet information storage unit 541, so that next time is when receiving same resolving information, need not save system resource again to proxy requests.
As shown in Figure 6, be schematic flow sheet of the present invention, as seen from the figure, the present invention program mainly may further comprise the steps:
S610, MS are to the T-ASN-GW administration subnet information of S-ASN-GW request T-BS ID correspondence;
When MS switches, receive switch indicating information earlier, comprise in this message and permit the corresponding T-BS ID of T-BS that MS switches to, more than one of this T-BS possibility, its corresponding T-ASN-GW also may be more than one.Information for the subnet that T-ASN-GW administers of resolving this T-BS ID correspondence, so that before switching, configure T-CoA at T-ASN-GW administration subnet, MS sends RtSolPr message (wherein comprising T-BS ID) to S-ASN-GW, ask its relevant information that issues the subnet that T-ASN-GW administers of T-BS ID correspondence, as link layer address, link prefix etc.
The ASN-GW administration subnet information that S620, the S-ASN-GW basis and first network element are mutual, the T-ASN-GW that obtains described T-BS ID correspondence administers subnet information;
In this step, S-ASN-GW asks at described MS, obtains the T-ASN-GW administration subnet information of described T-BS ID correspondence, and this step can realize by several modes:
1, S-ASN-GW directly administers subnet information to the T-ASN-GW of the described T-BS ID of first network element request correspondence, and obtains the T-ASN-GW administration subnet information of described T-BS ID correspondence according to the information that first network element is replied;
2, when the ASN-GW and the first network element interactive information (such as when first network element periodically during the up-to-date information of the administration of all ASN-GW in ASN-GW announces its compass of competency subnets, each ASN-GW stores described up-to-date information, when receiving the MS request, inquire about described canned data, obtain the T-ASN-GW administration subnet information of described T-BS ID correspondence.
S630, MS are according to the corresponding T-ASN-GW administration of T-BSID subnet information, and configuration T-CoA finishes handover operation.
MS carries out the T-CoA configuration, and finishes handover operation according to related procedure according to the corresponding T-ASN-GW administration of T-BS ID subnet information.
Below in conjunction with concrete application process, the present invention program's specific embodiment is described.As shown in Figure 7, this embodiment comprises the steps:
S710, ASN-GW send to first network element with the information of administration network.
When setting up system, ASN-GW is the information of administration network, includes but not limited to the link prefix etc. of the subnet that BS ID, this ASN-GW administer of the sign of this ASN-GW, the IPv6 address of ASN-GW self, BS that this ASN-GW administers.
ASN-GW can send the information of the subnet of administering by (but being not limited to) IP datagram literary composition message or WiMAX management plane message in the above-mentioned steps to first network element.
S720, first network element periodically send the up-to-date information that (in its compass of competency) all ASN-GW administer subnets to each ASN-GW.
S730, S-ASN-GW preserve above-mentioned up-to-date information, and a storage form is set, and utilize this form that the relevant information of receiving is stored, and wherein some information may configure when setting up system.
S740, MS send RtSolPr message (wherein comprising T-BS ID) to S-ASN-GW, ask it to issue the relevant information of the subnet that T-ASN-GW administers of T-BS ID correspondence.
S750, when S-ASN-GW extracts T-BS ID in the message that MS sends after, at first should search at above table, if contain T-BS ID corresponding informance in the form, directly carry out step S780, can alleviate network burden like this, avoid unnecessary message to transmit.If under the situation of the information that can not find the T-BS ID correspondence that MS sends in this form, carry out step S760.
S760, S-ASN-GW send the message that expression " is asked T-BS ID corresponding A SN-GW administration subnet " to first network element, ask it to issue the subnet information of corresponding ASN-GW administration.
S770, first network element are searched the information of corresponding ASN-GW administration subnet according to the BS ID that S-ASN-GW sends over.First network element sends the message that expression " is responded the request of T-BSID corresponding A SN-GW administration subnet " to S-ASN-GW after obtaining above-mentioned information, issues the corresponding information that finds.
Two message of mutual expression between first network element and the S-ASN-GW here " request of T-BS ID corresponding A SN-GW administration subnet ", " responding the request of T-BS ID corresponding A SN-GW administration subnet " can lead to IP datagram literary composition message or WiMAX management plane message realizes, also can be by other message bearings that can realize.
The T-ASN-GW relevant information corresponding with T-BS ID that S780, S-ASN-GW will obtain is carried in the PrRtAdv message and sends to MS.
S790, MS are according to the corresponding T-ASN-GW administration of T-BS ID subnet information, and configuration T-CoA finishes handover operation.
The technology of the present invention provided a kind of in WiMAX MIPv6 switches fast S-ASN-GW obtain the method for switching relevant ASN-GW subnet information.Filled up the blank that present S-ASN-GW can't obtain the T-ASN-GW administration subnet information that may switch to, provide precondition for practical application MIPv6 in the WiMAX system switches fast.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1, a kind of in WiMAX MIPv6 terminal switching method, it is characterized in that, comprising:
A, terminal are administered subnet information to the target access service network gateway of service access service network gateway request target Base Station Identification correspondence;
B, service access service network gateway basis and the mutual access service network gateway administration subnet information of first network element are obtained the corresponding target access service network gateway administration subnet information of described target BS sign;
C, the terminal target access service network gateway administration subnet information corresponding according to described target BS sign, the configuration target forward address is finished handover operation.
2, the method for claim 1 is characterized in that, described first network element stores access service network gateway administration subnet information in the described access service network.
3, method as claimed in claim 1 or 2 is characterized in that, described first network element is announced each access service network gateway administration subnet information to described access service network gateway.
4, method as claimed in claim 3 is characterized in that, described access service network gateway stores each access service network gateway administration subnet information in the described access service network that described first network element sends.
5, method as claimed in claim 4, it is characterized in that, among the described step B, described target access service network gateway is searched each access service network gateway administration subnet information in the described access service network of its storage, obtains the corresponding target access service network gateway administration subnet information of described target BS sign.
6, method as claimed in claim 5, it is characterized in that, among the described step B, if described target access service network gateway does not find the corresponding target access service network gateway administration subnet information of described target BS sign, then to the described information of the described first network element request.
7, the method for claim 1 is characterized in that, the target access service network gateway administration subnet information that described target BS sign is corresponding includes but not limited to one of following content or combination:
The link prefix of the Base Station Identification of access service network gateway sign, the IPv6 address of access service network gateway, base station that access service network gateway is administered and access service network gateway administration subnet.
8, the method for claim 1 is characterized in that, adopts IP datagram literary composition message or WiMAX management plane interacting message information between the described target access service network gateway and first network element.
9, the method for claim 1 is characterized in that, described first network element can be access service network gateway or access service network gateway agent unit.
10, a kind of in WiMAX MIPv6 terminal switching system, be included as serving BS and service access service network gateway that terminal provides access, and terminal target BS and the target access service network gateway desiring to switch to, it is characterized in that, also comprise:
First network element is arranged at described access service network, stores in the described access service network access service network gateway administration subnet information, and access service network gateway administration subnet information in the mutual described access service network between the described access service network gateway.
11, system as claimed in claim 10 is characterized in that, described access service network gateway also is provided with:
Access service network gateway administration subnet information storage unit is used for receiving each access service network gateway administration subnet information of described access service network that described first network element sends.
12, system as claimed in claim 10 is characterized in that, described first network element can be the agent unit of access service network gateway or access service network gateway.
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| CN101640877B (en) * | 2009-08-20 | 2012-05-09 | 中兴通讯股份有限公司 | Switch method and switch device for WiMAX system |
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