CN102123373B - User equipment for switching between different types of access systems - Google Patents
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Abstract
The invention discloses a method for switching between different types of access systems. The method comprises the following step that: user equipment (UE) acquires the address of an inter access system anchor (IASA) from a source access system and accesses the IASA to which the UE is connected in the source access system through a destination access system in the process of switching between the different types of accesses systems. Through the invention, the IASA, a home agent (HA), a virtual private network gateway (VPN GW) and the like can be searched without the domain name system (DNS) analyzing process in the destination access system, and the switching time of the UE can be reduced. Furthermore, the invention can ensure that the service anchors of the UE in the source access system and the destination access system are kept consistent, so that the UE can use the same Internet protocol (IP) address to interact with outside networks, the interruption of a service is reduced, and the continuity of the service is ensured.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to the subscriber equipment of the switching between the xenogenesis connecting system.
Background technology
In order to strengthen following mobile network's competitiveness, third generation partner program (3GPP, The3rd Generation Partnership Project) with the main development direction-locking of its next stage on the evolution system framework (SAE, System Architecture Evolution) of multiple networks fusion.Referring to SAE network architecture schematic diagram shown in Figure 1, the user both can by 3GPP connecting system access evolution block core net (Evolved Packet Core), also can pass through non-3GPP (non 3GPP) connecting system access evolution block core net.Wherein, described 3GPP connecting system is General Packet Radio Service System GPRS or universal mobile telephone system UMTS or evolution system framework SAE etc.; Described non-3GPP connecting system is WLAN (wireless local area network) WLAN or micro-wave access global inter communication network WiMAX or code division multiple access system CDMA or CDMA2000 etc.
As shown in Figure 1, evolution block core net Evolved Packet Core mainly comprises Mobility Management Entity (MME, Mobility Management Entity)/user data face entity (UPE, User PlaneEntity), 3GPP anchor point (Anchor) and three logic function modules of SAE Anchor.Wherein, MME is responsible for the mobile management of chain of command, comprises the management of user's context and mobile status, distributing user temporary identity sign, safety function etc.; UPE is responsible for initiating paging for downlink data under the idle condition, and Internet protocol (IP) bearing parameter and the interior routing iinformation of network etc. are preserved in management; 3GPP Anchor is the anchor point between 2G/3G and Long Term Evolution (LTE, the Long Term Evolution) connecting system; SAEAnchor then serves as the user's face anchor point between different access systems.
As 3GPP Anchor and SAE Anchor unification composition connecting system anchor point (IASA, InterAccess Systems Anchor) as all access technologies in SAE during external professional anchor point, subscriber equipment (UE, User Equipment) can be by evolution wireless access network (E-RAN, EvolvedRAN), MME/UPE is connected to IASA, at this moment, use mobile management (MM between UE and the MME/UPE, Mobility Management)/session management (SM, Session Management) agreement communicates, use GPRS Tunnel Protocol (GTP, GPRSTunnel Protocol) to communicate between MME/UPE and the IASA; In addition, UE also can be connected to IASA by non-3GPP gateway (non 3GPPGW), UE and non 3GPP GW use distinctive wireless protocols to communicate, and use mobile Internet Protocol MIP (Mobile Internet Protocol) or MOBIKE agreement (IKEv2Mobility and Multihoming Protocol) to communicate between UE and the IASA.
When UE moves between the 3GPP connecting system, use the GTP agreement handle information (such as MM Context MM Context and block data protocol context PDP Context) relevant with UE to be delivered to new system from old system between the Serving GPRS Support Node (SGSN, ServingGPRS Support Node) and between SGSN and the MME/UPE; When UE moves between non 3GPP connecting system, use the MIP/MOBIKE agreement to carry out alternately between UE and the IASA.
But, when UE moves between the xenogenesis connecting system, such as switch to non 3GPP connecting system from the 3GPP connecting system, perhaps switch to the 3GPP connecting system from non 3GPP connecting system, owing to can't transmit the business information of UE between MME/UPE and the non 3GPP GW, therefore, when selecting IASA, need to re-start domain name system (DNS, the process of Domain Name System) resolving, the time that so easy increase UE switches, and, since UE may anchor when switching to new connecting system on different IASA, be activation of service attitude UE for professional ongoing UE is arranged therefore, cause easily professional interruption.Such as, when the UE that is in the activation of service attitude switches to the 3GPP connecting system from the non3GPP connecting system, need UE to re-start PDP Context activation at the 3GPP connecting system, when UE activates PDP Context at the 3GPP connecting system, APN (the APN that UE is provided by MME/UPE, Access Point Name) carries out dns resolution, and therefrom choose a result as this professional IASA, this mechanism can't guarantee that the IASA that chooses is exactly UE employed IASA when non 3GPP connecting system carries out business, and the difference of IASA will cause the ongoing professional interruption that occurs of UE.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of subscriber equipment of the switching between the xenogenesis connecting system, reduces switching time;
In addition, the present invention also provides a kind of subscriber equipment, for the purpose connecting system provides the IASA address.
For achieving the above object, changing method between xenogenesis connecting system provided by the invention is as follows: when user equipment (UE) switches between the xenogenesis connecting system, UE obtains connecting system anchor point IASA address and is linked on its connecting system anchor point IASA that connects the connecting system of source by the purpose connecting system from the source connecting system, and described source connecting system is 3GPP connecting system or non-3GPP connecting system.
This shows, among the present invention when UE switches between the xenogenesis connecting system, UE need to be linked on its IASA that connects in the connecting system of source by the purpose connecting system, thereby so that in the purpose connecting system, do not need to search IASA, HA or VPN Gw etc. by the dns resolution process, reduced UE switching time; And, can guarantee that like this UE is consistent with the professional anchor point of maintenance in the purpose connecting system at the source connecting system, so that UE can use identical IP address and external network to carry out alternately, solved owing to UE switches the problem of service interruption that causes between the xenogenesis connecting system, guaranteed business continuance.
Description of drawings
Fig. 1 is SAE network architecture schematic diagram of the prior art.
Fig. 2 is the handoff procedure schematic diagram of UE in the embodiment of the invention one.
Fig. 3 is the handoff procedure schematic diagram of UE in the embodiment of the invention two.
Fig. 4 is the handoff procedure schematic diagram of UE in the embodiment of the invention three.
Fig. 5 is the handoff procedure schematic diagram of UE in the embodiment of the invention four.
Fig. 6 is the activation of service process schematic diagram of Idle state UE in the embodiment of the invention.
Fig. 7 is the switched system structural representation among the present invention.
Fig. 8 is a kind of implementation structure schematic diagram of IASA.
Embodiment
Basic thought of the present invention is: when UE switched between the xenogenesis connecting system, UE is linked into its IASA that connects by the purpose connecting system in the connecting system of source be on the IASA of source.
For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.
Embodiment one
When UE switches to 3GPP connecting system (purpose connecting system) from non 3GPP connecting system (source connecting system), UE need to initiate the activation of service flow process of this APN again in purpose 3GPP connecting system, at this moment, the IASA address that UE will obtain from non 3GPP connecting system (IASA address, source) offers the 3GPP connecting system, SGSN in the 3GPP connecting system or MME/UPE obtain just no longer initiating the DNS inquiry behind this IASA address, but the IASA address of using UE to provide.
Referring to shown in Figure 2, adopt the MIP agreement as example take non 3GPP connecting system, when UE switched to the 3GPP connecting system from the non3GPP connecting system, the handoff procedure in the present embodiment mainly may further comprise the steps:
Step 201:UE is UE--non 3GPPGW--IASA in the business datum route of non 3GPP connecting system.
Step 202:UE carries out the access authentication procedure that meets 3GPP connecting system standard when detecting the 3GPP wireless signal.
Step 203:UE sends PDP context activation request (ActivePDP Context Request) to SGSN or MME/UPE, carry out the activation of service flow process, be based upon the IP carrying in the 3GPP connecting system, and, because the business on this APN is in activated state, therefore, UE carries the IASA address corresponding with this APN in this message, i.e. UE employed IASA address in the connecting system of source.
Need to prove that UE also can send to SGSN or MME/UPE with IASA address, source by alternate manner.
In addition, UE also can carry an IASA allocation identification in this message, be used to refer to whether to allow SGSN or MME/UPE to redistribute the IASA address, such as, this sign is set at 1 o'clock represents to allow SGSN or MME/UPE to distribute the IASA address; This sign is set at 0 o'clock represents not allow SGSN or MME/UPE to distribute the IASA address, but the IASA address of using UE to provide.
In the present embodiment, for the professional anchor point in source connecting system and the purpose connecting system is consistent, UE can use identical IP address and external network to carry out alternately, guarantee the continuity of UE business, SGSN or MME/UPE can not change the IASA address that UE provides, and need the IASA allocation identification is set to 0.
After step 204:SGSN or MME/UPE receive the Active PDP ContextRequest message that UE sends, the corresponding IASA in IASA address that carries in this message, be that UE employed IASA (source IASA) in the connecting system of source sends PDP Context and sets up request (Create PDPContext Request).
After step 205:IASA receives Create PDP Context Request message, start Bi-casting mechanism, pass through simultaneously 3GPP connecting system and non 3GPP connecting system to UE issuing service data, and return PDP Context foundation response (Create PDP ContextResponse) to SGSN or MME/UPE.
At this moment, IASA need not again to be UE distribution UE IP, and UE still uses employed UE IP in the connecting system of source.
After step 206:SGSN or MME/UPE receive Create PDP Context Response message, send PDP context activation success response (Active PDP Context Accept) to UE.
After step 207:UE receives Active PDP Context Accept message, initiate MIP by non 3GPP connecting system to IASA and remove registration request.
After step 208:IASA received that MIP removes registration request, the registration binding related information of UE on IASA stopped Bi-casting, and returns MIP to UE and go the registration response in the deletion non 3GPP connecting system.
Step 209:UE is UE--3GPPMME/UPE--IASA in the business datum route of 3GPP connecting system.
Embodiment two
Referring to shown in Figure 3, adopt the MOBIKE agreement as example take non 3GPP connecting system, when UE switched to the 3GPP connecting system from non 3GPP connecting system, the handoff procedure in the present embodiment mainly may further comprise the steps:
Step 301～306: consistent with step 201～206, repeat no more here.
After step 307:UE receives Active PDP Context Accept message, initiate the tunnel releasing request by non 3GPP connecting system to IASA.
After step 308:IASA receives the tunnel releasing request, carry out the tunnel and discharge, and return tunnel release response to UE.
Step 309:UE is UE--3GPPMME/UPE--IASA in the business datum route of 3GPP connecting system.
Embodiment three
When UE switches to non 3GPP connecting system (purpose connecting system) from 3GPP connecting system (source connecting system), if UE is by non 3GPP connecting system and adopts the MIP agreement to be connected to the SAE network, then UE use its from IASA address that the 3GPP connecting system obtains as home agent (HA, Home Agent) address; If UE is by non 3GPP connecting system and adopts the MOBIKE agreement to be connected to the SAE network, then UE use its from IASA address that the 3GPP connecting system obtains as Virtual Private Network gateway (VPN GW) address, thereby guarantee that UE can be linked on the IASA of appointment in the SAE network by purpose non3GPP connecting system.
Referring to shown in Figure 4, adopt the MIP agreement as example take non 3GPP connecting system, when UE switched to non 3GPP connecting system from the 3GPP connecting system, the handoff procedure in the present embodiment mainly may further comprise the steps:
Step 401:UE is UE--3GPPMME/UPE--IASA in the business datum route of 3GPP connecting system.
Step 402:UE carries out the access authentication procedure that meets non 3GPP connecting system standard when detecting non 3GPP wireless signal.
Step 403:UE obtains the prefix information of visited network by route announcement message.
Step 404:UE obtains Care-of Address (CoA, Care ofAddress).
If MIPv4FA-CoA (mobile IP protocol edition 4 foreign agent care-of address), then step 404 is omitted.
Step 405:UE use its from IASA address that the 3GPP connecting system obtains, be UE the connecting system of source employed IASA address as the HA address, using it is that UE IP is as home address (HoA from the IP address that the 3GPP connecting system obtains, Home Address), initiate the MIP registration request to its employed IASA in the connecting system of source.
After step 406:IASA receives the MIP registration request of UE initiation, it is related with the binding of HoA address to set up the CoA address at HA, owing on the HA the current PDP Context that is in activated state is arranged, so when HA has set up new binding association, IASA begins to start Bi-casting mechanism, and returns MIP registration response to UE.
Wherein, step 406 and step 406 in fact in other words, UE uses its employed IASA (source IASA) in the connecting system of source to initiate the MIP registration as HA, and need not to obtain the HA address by parsing, thereby has saved switching time.
Step 407:UE initiates the PDP deactivation process, sends PDP context deactivation request (Deactive PDP Context Request) to SGSN or MME/UPE.
After step 408:SGSN or MME/UPE receive Deactive PDP ContextRequest message from UE, send PDP Context removal request (Delete PDP ContextRequest) to IASA.
After step 409:IASA receives Delete PDP Context Request message, delete the PDP Context of this UE, discharge the resource that this UE takies in the 3GPP system, stop Bi-casting, and return PDP Context deletion response (Delete PDP ContextResponse) to SGSN or MME/UPE.
After step 410:SGSN or MME/UPE receive Delete PDP Context Response message, return PDP context deactivation success response (Deactive PDP Context Accept) message to UE.
Step 411:UE is UE--non 3GPPGW--IASA in the business datum route of non 3GPP connecting system.
Embodiment four
Referring to shown in Figure 5, adopt the MOBIKE agreement as example take non 3GPP connecting system, when UE switched to non 3GPP connecting system from the 3GPP connecting system, the handoff procedure in the present embodiment mainly may further comprise the steps:
Step 501:UE is UE--3GPPMME/UPE--IASA in the business datum route of 3GPP connecting system.
Step 502:UE carries out the access authentication procedure that meets non 3GPP connecting system standard when detecting non 3GPP wireless signal.
The IP address that step 503:UE obtains in non 3GPP connecting system is local IP address.
Step 504: because UE preserves the IASA address corresponding with this APN that obtains at the 3GPP connecting system, therefore do not need to carry out the DNS process, UE directly initiates internet key with its employed IASA address in the connecting system of source as VPN GW address and upgrades (IKE, Intemet KeyExchange) process, initiate the IKE_SA_INIT request to its employed IASA (source IASA) in the connecting system of source, with this IASA exchange IKE_SA_INIT message.
Step 505:IASA returns the IKE_SA_INIT response to UE after receiving the IKE_SA_INIT request of UE initiation.
Step 506:UE sends the IKE_AUTH request to IASA.
Recorded the corresponding relation of the local IP of UE and remote IP (be UE IP address that the 3GPP connecting system obtains) among the step 507:IASA, after IASA receives IKE_AUTH request message, start Bi-casting mechanism, send downlink data by 3GPP and two data passages of non 3GPP to UE, and return IKE_AUTH response to UE, the IKEv2 negotiations process finishes.
Wherein, step 504,505,506 and 507 in fact in other words, UE use its in the connecting system of source employed IASA (source IASA) as VPN GW initiating internet protocol safety (IPsec, Intemet Protocol Security) building tunnel, and need not to obtain VPN GW address by resolving, thereby saved switching time.
Step 508～512: consistent with step 407～411, repeat no more here.
Need to prove, when UE when non 3GPP connecting system accesses, UE can preserve the IASA address of access, and when UE when the 3GPP connecting system accesses, UE then can not preserve the IASA address, therefore, in order to adapt to needs of the present invention, need to carry out obtaining of IASA address at the UE of 3GPP connecting system access.The mode that UE obtains the IASA address at the 3GPP connecting system has a variety of, such as, by the activation of service Procedure Acquisition; Perhaps, obtain in the Internet Control Message Protocol ICMP message route announcement (Router Advertisement) that the IP layer sends by IASA, that is to say, IASA sends to UE by Router Advertisement message with self address.
Below in conjunction with Fig. 6 UE is elaborated by the mode of activation of service Procedure Acquisition IASA address.When UE was attached to the 3GPP connecting system and initiate activation of service process on certain APN, UE need to obtain the IP address that IASA distribute to UE by SGSN or MME/UPE, is used for the access external network; And this moment, UE also will obtain the IASA address, when UE switches to non 3GPP connecting system from the 3GPP connecting system, and the professional anchor point of the SAE network that when non 3GPP accesses, uses as UE.
Referring to shown in Figure 6, idle (idle) attitude UE mainly may further comprise the steps in the activation of service process of 3GPP connecting system:
Step 601:UE sends Active PDP Context Request message to SGSN or MME/UPE, carry the information such as APN, IASA address, UE IP and IASA allocation identification in this message, wherein, IASA address and UE IP are empty or are a static ip address, the IASA allocation identification is used to indicate whether allow SGSN or MME/UPE distribution IASA address, herein owing to be the activation of service process of Idle state UE, therefore, the IASA allocation identification should be set to the value that allows SGSN or MME/UPE to distribute the IASA address.
Need to prove, also can not carry IASA address and IASA allocation identification in the Active PDP Context Request message.
After step 602:SGSN or MME/UPE receive the Active PDP ContextRequest message that UE sends, the APN that carries in this message is carried out dns resolution, select a suitable IASA, then, send Create PDP Context Request message to this IASA.
After step 603:IASA receives the Create PDP ContextRequest message that SGSN or MME/UPE send, set up PDP Context, if UE does not have static IP, IASA then distributes a suitable IP address UE IP to UE, and returns the Create PDP Context Response message of carrying UE IP to SGSN or MME/UPE.
After step 604:SGSN or MME/UPE receive Create PDP ContextResponse message from IASA, send Active PDP Context Accept message to UE, and in this message, carry UE IP and IASA address.
UE preserves UE IP and the IASA address of wherein carrying after receiving Active PDP Context Accept message.
Need to prove, the switching that the present invention mentions not only comprises switching that UE occurs in the activation of service attitude, namely is in the movement of UE between different access systems of activation of service attitude, comprise that also UE in the switching that Idle state occurs, namely is in the movement of UE between different access systems of Idle state.
In addition, the present invention also provides a kind of switched system, and its concrete structure mainly comprises referring to shown in Figure 7: UE, purpose connecting system and source IASA, and wherein, UE is used at handoff procedure IASA address, source being sent to the purpose connecting system; The purpose connecting system is used for receiving the IASA address, source that UE sends, and is linked on the corresponding source IASA in IASA address, this source.
Wherein, described UE can comprise IASA address preservation module and IASA address sending module, and wherein, the IASA address is preserved module and is used for preserving the IASA address; IASA address sending module is used for preserving module from the IASA address and obtains the IASA address, and the IASA address that obtains is sent to the purpose connecting system.
In addition, referring to shown in Figure 8, IASA is when specific implementation, may be for different connecting system (AS, Access System) adopt different interface IP addresses to interconnect, such as, IASA is connected the IP address of adopting a subnet with SGSN or MME/UPE, and IASA is connected with non 3GPP GW and then adopts another subnet of ip address.
When UE switches between the xenogenesis connecting system according to method provided by the present invention, UE will use IASA address, source to carry out a series of operation in the purpose connecting system, such as, when UE switches to non 3GPP connecting system from the 3GPP connecting system, initiate MIP registration or IPsec building tunnel with adopting its IASA address of in the 3GPP connecting system, using as HA address or VPN GW address, if this moment IASA for the address of the address of non 3GPP connecting system and 3GPP connecting system not in a subnet, so, will certainly cause the failure of the operations such as MIP registration or IPsec building tunnel.
Generation for fear of this situation, can slightly make an amendment to technical solution of the present invention, when UE accessed from connecting system, network side distributed two IASA addresses for UE simultaneously, be 3GPP IASA address and non 3GPP IASA address, UE preserves these two IASA addresses.Wherein, the 3GPPIASA address refers to that IASA is connected the IP address of adopting with SGSN or MME/UPE; Non 3GPPIASA address refers to that IASA is connected the IP address of adopting with non 3GPP GW.
Such as, when the UE with multiple wireless access capability that is in the idle attitude when the 3GPP connecting system carries out activation of service, SGSN or MME/UPE initiate PDP Context to a 3GPP IASA address and set up request after APN resolves, specify a non 3GPP IASA address to return to UE after this IASA request of receiving, UE preserves 3GPP IASA address and the non 3GPP IASA address that obtains simultaneously; When UE when non 3GPP connecting system accesses, by DNS APN is resolved a backward non 3GPP IASA address and initiate MIP registration or IPsec building tunnel, this IASA specifies a 3GPP IASA address to return to UE, and UE preserves 3GPP IASA address and the non3GPP IASA address that obtains simultaneously.Like this, when UE switches to non 3GPP connecting system from the 3GPP connecting system, just use non 3GPP IASA address to initiate MIP registration or IPsec building tunnel; When UE switches to the 3GPP connecting system from non 3GPP connecting system, just use 3GPP IASA address to initiate activation of service at the 3GPP connecting system, thereby avoided the generation of the problems referred to above.
In addition, the equipment such as SGSN or MME/UPE can be referred to as the 3GPP IAD in the present invention.
The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to limit the present invention; within the spirit and principles in the present invention all; any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. subscriber equipment is characterized in that:
Described subscriber equipment switches between non-3GPP connecting system and 3GPP connecting system, when the source connecting system is described 3GPP connecting system, when the purpose connecting system is described non-3GPP connecting system, described subscriber equipment in the activation of service process of described 3GPP connecting system, by the packet data protocol context activation request message to the source connecting system anchor point IASA address of the described subscriber equipment of network side request in the connecting system of source;
Described subscriber equipment uses IASA address, described source to initiate mobile Internet Protocol MIP registration as the home agent HA address to source IASA, perhaps, described subscriber equipment uses IASA address, described source as the safe IPsec building tunnel of Virtual Private Network gateway VPN GW address initiating internet protocol;
Wherein, described subscriber equipment comprises:
Module is preserved in the address, is used for preserving IASA address, described source;
The address sending module, be used for when switching, the IASA address, source of described preservation is sent to described purpose connecting system, so that described subscriber equipment is linked on the IASA that described subscriber equipment connects by described purpose connecting system in the connecting system of described source.
2. subscriber equipment as claimed in claim 1 is characterized in that, described address sending module is carried at IASA address, source and sends to the 3GPP IAD in the packet data protocol context activation request.
3. subscriber equipment according to claim 2 is characterized in that, described packet data protocol context activation request is further carried and is used to indicate the IASA allocation identification that whether allows the 3GPP IAD to distribute the IASA address.
4. subscriber equipment according to claim 1 is characterized in that, when IASA adopts different interface IP addresses and 3GPP connecting system and the interconnection of non-3GPP connecting system:
Described subscriber equipment specifically is used for:
Preserving network side is 3GPP IASA address and the non 3GPP IASA address of described user equipment allocation simultaneously; With
In handoff procedure, use the non 3GPP IASA address of preserving to initiate MIP registration or IPsec building tunnel.
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| US8488554B2 (en) | 2006-10-25 | 2013-07-16 | Huawei Technologies Co., Ltd. | Method and system for handover between different types of access systems |
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| CN103517264B (en) * | 2012-06-29 | 2017-04-12 | 华为终端有限公司 | Network switching method and device |
| CN110049523B (en) * | 2019-04-26 | 2021-09-21 | 新华三技术有限公司 | Access control method, access point connection method, access control device, access point connection device and electronic equipment |
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