CN100563390C

CN100563390C - Obtain the method for access system context

Info

Publication number: CN100563390C
Application number: CNB2006101156544A
Authority: CN
Inventors: 郭小龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-08-16
Filing date: 2006-08-16
Publication date: 2009-11-25
Anticipated expiration: 2026-08-16
Also published as: CN101128046A; WO2008022593A1

Abstract

The present invention discloses a kind of method of obtaining access system context, this method comprises: user equipment (UE) inserts current system, the information of this UE institute's last time connecting system is offered current system, and current system obtains context context according to this information from the entity of connecting system last time.Owing to adopt method provided by the present invention, can therefore, can effectively avoid unnecessary context acquisition process according to contextual the obtaining of carrying out of last institute connecting system, thereby make and contextually obtain easyly, efficient, and then help promoting the use of rapidly of SAE network technology.

Description

Obtain the method for access system context

Technical field

The invention belongs to communication technique field, relate in particular to a kind of method of obtaining access system context.

Background technology

In current third generation partner program (3GPP) communication system, each manufacturer's active research System Architecture Evolution (System Architecture Evolution, SAE) technology and Long Term Evolution (LongTerm Evolution, LTE) technology, wherein, the purpose of LTE technology provides a kind of network cheaply that can reduce time delay, raising user data rate, improved power system capacity and covering.In this LTE technology, only use PS territory business, bearer network all is the IP carrying.

On this basis, derived a lot of new network architectures, these network architectures can reach top requirement, and a kind of popular framework as shown in Figure 1.Referring to Fig. 1, in this framework, LTE RAN is the wireless access network of evolvement network, we do not do qualification node wherein, has eNodeB, may also have the chain of command server (Control Plane Server, CPS), we logically with it as Long Term Evolution radio access network entity (LTE-RAN Entity); Referring to Fig. 1, in this framework, except having LTE-RAN Entity, also have mobile management entity/user entity (Mobility ManagementEntity, User Plane Entity; MME/UPE), this entity also is a logic entity, and wherein, the function of MME is to preserve mobile management (MM) context of subscriber equipment (UE), as user's sign, and mobility status, tracking area (TA) information etc., and the user authenticated; The function of UPE is: the UE termination downlink data for being in the idle state, trigger paging simultaneously, and preserve the context of UE simultaneously, as the IP address of UE and routing iinformation etc.User Plane Anchor is the anchor point of user's face, is constant in user's Session Time.It is unrestricted whether MME/UPE separates following method.

Along with the research that deepens continuously for the above-mentioned network architecture, different radio access technologies (RadioAccess Technology, RAT) between limitation signaling become a crucial problem.For example, UE moves (as network and the evolvement network of 2G/3G) between different RAT, UE can rattle and causes network registration process owing to its current variation of being stationed network, this frequent network registration process can produce a large amount of register command expenses, thereby waste interface-free resources greatly, therefore, need research how the Signalling exchange in this process to be limited, thereby avoid the waste of interface-free resources.

Be example below with Fig. 2, above-mentioned frequent network registration process is illustrated.

Referring to Fig. 2, RA1 and RA2 are the route district (Routing Area) of existing 2G/3G, and the UE of existing 2G/3G will initiate Routing Area Update (Routing Area Update, RAU) process at RA of every replacing.Certainly, even UE under the situation of not changing RA, also has periodic position updating process, its effect is to make network understand UE at present whether also at network, and network is not understood and the constantly situation of paging UE generation to prevent the UE deviated from network.In the present invention, do not consider the situation of UE periodic location update.Referring to Fig. 2, TA1, TA2, TA3, TA4 are the tracking areas of evolvement network again, and this tracking area is similar to the RA of 2G/3G.Like this, support different access networks multimode UE regional when mobile when one,, will cause frequent network registration process if there is not certain mechanism at these, for example, when UE enters RA1, when quartering at the 2G/3G connecting system, can register to the SGSN of 2G/3G, when UE enters TA1, then again can be when being stationed the LTE connecting system to the MME/UPE of evolvement network registration, when UE moves out TA1 again and enters RA1, then need registration again to the SGSN of 2G/3G.So that network can paging be to UE in RAT, still, the register command expense that above-mentioned registration process is brought is huge by above-mentioned registration.

In order to solve the huge problem of register command expense, the current scheme that has proposed limitation signaling between various RAT, wherein, (System Architecture Evolution, specification document TR23.882 SAE) have proposed eight kinds of methods at present and have avoided this problem in the 3GPP System Architecture Evolution.General thinking is that UE start (attach) post-registration is to a kind of access network (2G/3G network or evolvement network), UE is registered to another access network after moving to another access network more afterwards, like this, UE just has been registered to two kinds of connecting systems simultaneously, and UE moves and need not initiate any registration process at the corresponding registration area (RA or TA) of these two networks afterwards.When UE changes RA or TA, initiate common RAU process.Wherein, it should be noted that: two kinds of connecting systems that UE is registered to (SGSN of 2G/3G or the MME of evolvement network) all have the context (context) of UE.

Because two connecting systems all have the context of UE, wherein relate to the stationary problem of context, the synchronization scenario of Context has following several altogether at present:

Scheme one, Master-slave scheme:

In this scheme, always keep up-to-date Context at MME, like this, UE needn't carry out context when inserting MME mutual, when SGSN has context to change, needs push context to MME/UPE.The shortcoming of this scheme is: when changing context in SGSN, all need push to MME/UPE.

Also has a kind of improvement project, it is the method for Master-slave+CRN, this method is, when UE in access procedure, relevant context (generally being the public dynamic context of MME and SGSN, as MM/SM context) in inserting entity changes, and then inserts the CRN renewal that entity oneself is preserved, and this CRN is synchronized to MME with the context that changes simultaneously to UE and MME synchronously.When UE inserts SGSN, need carry the CRN that UE preserves, if when the CRN that the CRN that UE sends up and SGSN preserve mates, SGSN needn't get context (being pull context) to MME, otherwise SGSN will get Context to MME.The purpose of doing like this is to prevent that SGSN from having had up-to-date context but still will want context to MME, and that inserted last time as UE is exactly SGSN, just needn't get context to MME when inserting SGSN so once more.The method of CRN guarantees to have only exactly just removes to obtain context (following method is the same) when being necessary.But the shortcoming of this method is also to want the push context all the time to store up-to-date context so that guarantee among the MME/UPE to MME/UPE when having context to change in the SGSN.

Scheme two, Coordination scheme:

In the time of each the access, in this Coordination scheme, need MME/SGSN to get the other side's context mutually, its reason is that this entity do not know whether the context in another entity changes.

Below in conjunction with accompanying drawing, the master-slave context method of synchronization that mainly adopts is at present described in detail, wherein, S-TMSI represents the Temporary Mobile Subscriber Identity of SAE, and U-TMSI represents the Temporary Mobile Subscriber Identity of UMTS, and S-RA represents the RA of SAE, be TA, U-RA represents the RA of UMTS.

Referring to Fig. 3,, and then move under the situation of 2G/3G to SAE at the attach of UE elder generation, context may further comprise the steps synchronously:

Step 31:UE attach sends attach request message to MME to SAE;

Step 32:MME is registered to HSS;

Step 33:MME obtains context from HSS after, initiate verification process to UE;

Step 34:UE return authentication responds to MME;

Step 35: if authentication is passed through, UE is registered to the MME success, and MME distributes S-TMSI/S-RA and default IP information to UE;

Step 36:UE changes RAT behind 2G/3G, sends the RAU process, and the S-TMSI/S-RA that carries the MME distribution gives UE;

Step 37:SGSN initiates the context that SGSN Context Request message is asked UE to the MME of S-TMSI/S-RA correspondence; MME receives the context request, and the context that will be correlated with sends to SGSN;

Step 38: execution may be carried out verification process;

The U-TMSI of its distribution of step 39:SGSN notice MME, U-RA and necessary context (as security parameter);

Step 310: set up the user face of SGSN to MME/UPE/IASA;

Step 311: U-TMSI/U-RA and S-TMSI/S-RA are distributed to UE, and UE moves between U-RA and S-RA needn't initiate registration updating message;

Step 312:RA upgrades affirmation.

By top process, just set up the association of SGSN to MME, promptly SGSN has preserved the address information that MME distributes to S-TMSI/S-RA or the MME of UE; MME also preserves the address information that SGSN distributes to U-TMSI/U-RA or the SGSN of UE.

In the top method, SGSN obtains the context that all need from MME, therefore, needs UE will obtain the context of SGSN needs when being registered to MME, if UE does not insert SGSN all the time, causes having the too many shortcoming of context of MME storage.

UE is registered to flow process that 2G/3G moves to SAE again earlier as shown in Figure 4, in 2G/3G, do periodic location update or common position when upgrading, send RAU message, carry U-TMSI/U-RA and S-TMSI/S-RA, because the context method of synchronization that adopts is the mode of master-slave, therefore, even the last RAT that inserts of UE is exactly 2G/3G, up-to-date context is kept at SGSN, and SGSN still will ask context to MME/UPE, thereby produces unnecessary context synchronizing process.

Be illustrated in figure 5 as the data transmission procedure under the master-slave mode, when UE inserts SGSN, need ask context,,, then needn't ask context to SGSN when UE inserts MME because up-to-date context keeps at MME to MME.Contrast is the transmitting uplink data process of Coordination scheme shown in Figure 6 therewith.

Can find out that from Fig. 6 UE also will ask context to SGSN when inserting MME.The mode that is Coordination needs UE to insert SGSN or MME, and the entity of access all will be got context to the other side, even the entity that inserted last time is identical with this, does not in fact need to get context.

Figure 7 shows that the RAU process of the inter SGSN of Master-slave mode, in this process, will carry the S-TMSI/S-RA parameter in the context request message, and need require to obtain context to MME.

Comprehensive above-mentioned prior art scheme, the shortcoming of prior art is:

The shortcoming of Master-slave scheme is the context of SGSN when changing, need be to the relevant context of MME push, and UE will reach context to MME when inserting SGSN; And the scheme of employing Coordination, its shortcoming is every access SGSN or MME, all will remove to obtain context to the other side's entity (being MME or SGSN).When UE one waits until at certain connecting system such as SGSN, these methods are brought the unnecessary process of getting context so.

Summary of the invention

In view of this, the object of the present invention is to provide the method for obtaining access system context, when adopting different RAT technology, all can obtain the context of corresponding connecting system to be implemented in.

For achieving the above object, the invention provides a kind of method of obtaining access system context, this method comprises:

User equipment (UE) inserts current system, and the information of this UE institute's last time connecting system is offered current system, and current system obtains context context according to this information from the entity of connecting system last time;

Wherein, in the information of described UE institute's last time connecting system, comprise the information that is used to show UE institute's last time connecting system type at least.

Wherein, described system is network architecture evolution SAE system or 2G/3G system, further comprises before this method:

Context is defined, it is decomposed into static part and dynamic part, wherein, static part is that SGSN or mobile management entity MME insert the context that obtains in the attach process in start from HSS, dynamic part is except that static part, SGSN or the MME context that action generates according to UE;

Again static part is divided into Static{SGSN, MME, Common}, i.e. ST{S, M, C} represents the context of the distinctive context of SGSN in the static part, the distinctive context of MME and public part respectively; Dynamic part also is divided into dynamic{SGSN, MME, Common}, i.e. DY{S, M, C} represents the context of the distinctive context of SGSN in the dynamic part, the distinctive context of MME and public part respectively.

Wherein, the system of described current access is the first wireless access technology RAT system, and the system that inserted described last time is the 2nd RAT system, and a RAT system and the 2nd RAT system are dissimilar connecting systems, and this method comprises:

Step 80:UE was linked into the 2nd RAT system last time, current access the one RAT system;

The access entity of step 81:UE in a RAT system initiates to insert request, carries to show that last time, connecting system was the sign of the 2nd RAT system in this request;

Step 82～step 83: the access entity in the RAT system is according to described sign, determine the old access entity of the 2nd RAT system that UE inserted last time, obtain DY{C} from this entity, realize DY{C} in a RAT system the access entity and the old access entity of the 2nd RAT system between synchronously;

Step 84: the access entity in the RAT system is set up related with the old access entity of the 2nd RAT system.

Wherein, described the 2nd RAT system is a System Architecture Evolution SAE system, and a described RAT system is the 2G/3G system, and this method comprises:

Step 800:UE attach last time is to SAE, current access 2G/3G network;

The SGSN of step 801:UE in the 2G/3G network initiates to insert request, carries to show that last time, connecting system was the sign of SAE system in this request;

Step 802～step 803:SGSN is according to described sign entrained in the described access request, determines the MME that UE inserted last time, and the MME that inserted from this last time obtains DY{C}, realizes DY{C) between SGSN and MME synchronously;

Step 804:SGSN sets up related with described MME.

Wherein, describedly show that last time, connecting system was being designated of SAE system:

The SAE system is S-TMSI and S-RA sign that this UE distributed, and wherein, S-TMSI represents the Temporary Mobile Subscriber Identity of SAE, and S-RA represents the route district RA of SAE.

Show that last time, institute's connecting system was the RAT type type sign of SAE system.

Wherein, this method further comprises:

Step 805:SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, described U-TMSI represents the Temporary Mobile Subscriber Identity of UMTS, and U-RA represents the RA of UMTS;

Moved to a SGSN who did not register if UE is current, then also comprised between step 804 and the step 805:

SGSN sends the position to HSS and upgrades position renewal Update Location message, with notice HSS current UE position change has taken place; HSS sends Cancel location message to Old SGSN, and HSS is with the ST{C of this UE, and S} sends to SGSN; SGSN upgrades successfully to HSS affirmation current location.

Wherein, described the 2nd RAT system is the 2G/3G system, and a described RAT system is the SAE system, and this method comprises:

Step 8100:UE attach last time is to 2G/3G, current access SAE system;

The MME of step 8101:UE in the SAE network initiates to insert request, carries to show that last time, connecting system was the sign of 2G/3G system in this request;

Step 8102～step 8103:MME is according to the entrained sign of described access request, determines the 0ld SGSN that UE inserted last time, obtains DY{C} from this Old SGSN, realizes DY{C) between SGSN and MME synchronously;

Step 8104:MME sets up related with SGSN.

Wherein, describedly show that last time, connecting system was being designated of 2G/3G system:

The 2G/3G system identifies for U-TMSI and the U-RA that this UE distributed.

Show that last time, institute's connecting system was the RAT type sign of 2G/3G system.

Wherein, this method further comprises:

Step 8105:MME is that UE distributes new S-TMSI, S-RA, and this S-TMSI, S-RA are sent to UE;

Moved to a MME who did not register if UE is current, then also comprised between step 8104 and the step 8105:

MME sends the position to HSS and upgrades Update Location message, with notice HSS current UE position change has taken place; HSS sends Cancel location message to Old MME, and HSS is with the ST{C of this UE, and M} sends to MME; MME upgrades successfully to HSS affirmation current location.

Wherein, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are dissimilar connecting systems, and the access entity of the RAT system that UE moved to is the access entity that UE had registered, and this method comprises:

Step 90:UE inserted the 2nd RAT system last time, and this inserts a RAT system, moves to the access entity of a RAT system;

Step 91:UE sends to the access entity of a RAT system and inserts request message, wherein, carries in this request and shows that last time, connecting system was the sign of the 2nd RAT system;

Step 92～step 93: the content that the access entity of a RAT system is entrained according to message in the step 91, determine the access entity of corresponding the 2nd RAT system to obtain DY{C} from this entity, realize DY{C} synchronously.

Wherein, described the 2nd RAT system is the 2G/3G system, and a described RAT system is the SAE system, and the MME in this SAE system is the MME that UE had registered, and this method comprises:

Step 900:UE inserted the 2G/3G system last time, and this inserts the SAE network, moves to MME;

Step 901:UE send to insert request message to MME, wherein, carries in this request and shows that last time, connecting system was the sign of 2G/3G system;

The content that step 902～step 903:MME is entrained according to message in the step 901 is determined corresponding SGSN, obtains DY{C} from this SGSN, and realization DY{C}'s is synchronous.

The entity SGSN that inserted last time is the sign U-TMSI/U-RA that this UE distributed, perhaps,

Show that last time, connecting system was the RAT type sign of 2G/3G system, wherein, this sign can assist MME to find SGSN in step 902～step 903; Perhaps,

The current SAE that inserts is the sign S-TMSI/S-RA that UE distributes, and this sign makes that in subsequent step MME finds corresponding SGSN in the corresponding related SGSN address information from the context that preserves, so that obtain context from SGSN;

Perhaps,

Show that last time, connecting system was above-mentioned these signs of being designated of 2G/3G system.

Wherein, described the 2nd RAT system is the SAE system, and a described RAT system is the 2G/3G system, and the SGSN in this 2G/3G system is the SGSN that UE had registered, and this method comprises:

Step 9100:UE inserted the SAE system last time, and this inserts the 2G/3G network, moves to SGSN;

Step 9101:UE send to insert request message to SGSN, wherein, carries in this request and shows that last time, connecting system was the sign of SAE system;

The content that step 9102～step 9103:SGSN is entrained according to message in the step 9101 is determined corresponding M ME, obtains DY{C} from this MME, and realization DY{C}'s is synchronous.

The entity MME that inserted last time is the sign S-TMSI/S-RA that this UE distributed, perhaps,

Show that subsystem is the RAT type sign of SAE system, wherein, this sign can assist SGSN to find MME in step 902～step 903; Perhaps,

The current 2G/3G that inserts is the sign U-TMSI/U-RA that UE distributes, and this sign makes that in subsequent step SGSN finds corresponding MME in the corresponding related MME address information from the context that preserves, so that obtain context from MME;

Perhaps,

Show that last time, connecting system was above-mentioned these signs of being designated of SAE system.

Wherein, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are the connecting system of same type, and the access entity of the RAT system that UE moved to is the new access entity that UE did not register, and this method comprises:

Step 100:UE inserted the 2nd RAT system last time, and this moves to the new access entity in the RAT system;

Step 101:UE sends to described new access entity and inserts request message, wherein, carries in this message and shows that last time, institute's connecting system was the sign of the 2nd RAT system;

Step 102: new access entity obtains dynamic context according to correlated identities entrained in step 101 message from the access entity of the 2nd RAT system;

Step 103: described new access entity triggers position is new technological process more, sends the position to HSS and upgrades Update Location message;

Step 104:HSS and new access entity carry out interacting message, and the static context of UE is sent to described new access entity;

Step 105: set up related between the access entity of described new access entity and another dissimilar connecting systems.

Wherein, described the 2nd RAT system is the 2G/3G system, a described RAT system is the 2G/3G system, and UE moved to the SGSN that a last time do not register, and this method comprises:

Step 1000:UE inserted the 2G/3G network last time, and this moves to new access entity newSGSN;

Step 1001:UE send to insert request message to new SGSN, wherein, carries in this message and shows that last time, institute's connecting system was the sign of 2G/3G system;

Step 1002:new SGSN obtains dynamic context DY{C, S} according to correlated identities entrained in step 1001 message from oldSGSN;

Step 1003:new SGSN trigger position is new technological process more, sends the position to HSS and upgrades UpdateLocation message;

Step 1004:HSS and new SGSN carry out interacting message, and with the static context ST{C of UE, S} sends to new SGSN;

Set up related between step 1005:new SGSN and the MME; Wherein, obtain in the context of the address information of MME by old SGSN.

Wherein, in this message, carry and show that last time, institute's connecting system was being designated of 2G/3G system:

In this message, carry the entity SGSN that inserted last time at least and be the sign U-TMSI/U-RA that this UE distributed, perhaps,

At least carry the type RAT type of the entity that inserted last time in this message, wherein, this RAT type can assist new SGSN to find old SGSN in subsequent step; Perhaps,

In this message, carry above-mentioned these signs.

Wherein, described the 2nd RAT system is the SAE system, a described RAT system is the SAE system, and UE moved to the MME that a last time do not register, and this method comprises:

Step 11000:UE inserted the SAE network last time, and this moves to new access entity new MME;

Step 11001:UE send to insert request message to new MME, wherein, carries in this message and shows that last time, institute's connecting system was the sign of SAE system;

Step 11002:new MME obtains dynamic context DY{C, M} according to correlated identities entrained in step 11001 message from oldMME;

Step 11003:new MME trigger position is new technological process more, sends the position to HSS and upgrades (UpdateLocation) message;

Step 11004:HSS and new MME carry out interacting message, and with newly-generated static context ST{C, M} sends to new MME;

Set up related between step 11005:new MME and the SGSN.

Wherein, in the step 11001, described carrying in this message shows that last time, institute's connecting system was being designated of SAE system:

In this message, carry the entity MME that inserted last time at least and be the sign S-TMSI/S-RA that this UE distributed, perhaps,

At least carry the type RAT type of the entity that inserted last time in this message, wherein, this RAT type can assist new MME to find old MME in subsequent step;

In this message, carry above-mentioned these signs.

Wherein, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are dissimilar connecting systems, and the access entity of the RAT system that UE moved to is the new access entity that UE did not register, and this method comprises:

Step 110:UE inserted the 2nd RAT system last time, and this moves to described new access entity;

Step 111:UE sends to new access entity and inserts request message, wherein, carries in this message and shows that last time, institute's connecting system was the sign of the 2nd RAT system;

Step 112: new access entity is according to the described sign in step 111 message, obtain dynamic context from the old access entity of a RAT system, from the access entity of the 2nd RAT system obtain DY{C} and, be registered to the static context that HSS obtains a RAT system.

Wherein, in the step 110, described carrying in this message shows being designated of institute's connecting system last time:

In this message, only carry the entity that inserted last time and be the sign that this UE distributed, perhaps,

The RAT that is inserted before only carrying in this message is the sign that UE distributes, this sign makes in subsequent step, from this sign or from the context that inserts the entity preservation or from the context that other entities are obtained, find corresponding the 2nd RAT entity, so that a RAT entity obtains context from the 2nd RAT entity; Perhaps,

At least carry the type RAT type of the entity that inserted last time in this message, wherein, this RAT type can assist a RAT entity to find the 2nd RAT entity in subsequent step; Perhaps,

In this message, carry above-mentioned these signs.

Wherein, described the 2nd RAT system is the SAE system, a described RAT system is the 2G/3G system, and UE moved to the SGSN that a last time do not register, and this method comprises:

Step 1100:UE inserted the SAE network last time, and this moves to new access entity new SGSN;

Step 1101:UE send to insert request message to new SGSN, wherein, carries in this message and shows that last time, institute's connecting system was the sign of SAE system;

Step 1102:new SGSN obtains DY{S} according to the described sign in step 1101 message from old SGSN, from MME obtain DY{C} and, be registered to HSS and obtain ST{C, S}.

Wherein, describedly show that last time, institute's connecting system was being designated of SAE system:

This inserts the RAT system is the sign U-TMSI/U-RA that UE distributed, and then the specific implementation of step 1102 is:

New SGSN finds self not have the context of UE, then obtains old SGSN address according to U-TMSI entrained in the described message, obtains DY{S} from old SGSN, to the HSS registration, obtains ST{C, S}; By the address information of understanding MME among the context that obtains or the address information of from the context that HSS obtains, obtaining MME, and obtain up-to-date DY{C} from this MME.

The SAE system that inserted last time is the sign S-TMSI/S-RA that UE distributed, and then the specific implementation of step 1102 is:

New SGSN obtains DY{C} from MME earlier according to this S-TMSI/S-RA, is registered to HSS and obtains ST{C, and S} obtains the address information of old SGSN from the context that obtains, obtain DY{S} from this old SGSN.

The 2G/3G system of this access is the sign U-TMSI/U-RA that UE distributed, and then the specific implementation of step 1102 is:

New SGSN identifies according to described U-TMSI/U-RA, sends the context request to old SGSN, after old SGSN obtains context DY{C} from MME more then, with up-to-date context DY{C, S} issue new SGSN and, new SGSN is registered to HSS and obtains ST{C, S}.

New SGSN sends the context request to MME, and MME gets DY{S} from old SGSN more then, with up-to-date context DY{C, S} issue new SGSN and, new SGSN is registered to HSS and obtains ST{C, S}.

Wherein, described the 2nd RAT system is the 2G/3G system, a described RAT system is the SAE system, and UE moved to the MME that a last time do not register, and this method comprises:

Step 11100:UE inserted the 2G/3G network last time, and this moves to new access entity newMME;

Step 11101:UE send to insert request message to newMME, wherein, carries in this message and shows that last time, institute's connecting system was the sign of 2G/3G system;

Step 11102:new MME obtains DY{M} according to the described sign in step 11101 message from old MME, from SGSN obtain DY{C} and, be registered to HSS and obtain ST{C, M}.

Wherein, describedly show that last time, institute's connecting system was being designated of 2G/3G system:

This inserts the RAT system is the sign S-TMSI/S-RA that UE distributed, and then the specific implementation of step 11102 is:

New MME finds self not have the context of UE, then obtains old MME address according to S-TMSI entrained in the described message, obtains DY{M} from old MME, to the HSS registration, obtains ST{C, M} again; Determine the address information of SGSN by the address information of understanding SGSN among the context that obtains, and obtain up-to-date DY{C} from this SGSN.

The 2G/3G system that inserted last time is the sign U-TMSI/U-RA that UE distributed, and then the specific implementation of step 11102 is:

New MME obtains DY{C} from SGSN earlier according to this U-TMSI/U-RA, and is registered to HSS and obtains ST{C, and M} obtains the address information of oldMME from the context that obtains, obtain DY{M} from this old MME.

The SAE system of this access is the sign S-TMSI/S-RA that UE distributed, and then the specific implementation of step 11102 is:

New MME identifies according to described S-TMSI/S-RA, sends the context request to old MME, after oldMME obtains context DY{C} from SGSN more then, with up-to-date context DY{C, M} issue new MME and, new MME is registered to HSS and obtains ST{C, M}.

New MME sends the context request to SGSN, and SGSN gets DY{M} from old MME more then, with up-to-date context DY{C, M} issue new MME and, new MME is registered to HSS and obtains ST{C, M}.

Wherein, described MME and/or SGSN preserve all dynamic context DY{all} respectively, and the entity of described current access system obtains described DY{all} from the entity of a last connecting system.

Wherein, described MME and/or SGSN preserve all dynamic context DY{all} and all static context ST{all} respectively, and the entity of described current access system obtains described ST{all} and/or DY{all} from the entity of a last connecting system.

Wherein, described MME and/or SGSN preserve dynamic context DY and static context ST separately respectively, the entity of described current access system that once inserted from UE with entity current access system connecting system of the same type obtain dynamic context and static context.

Wherein, the system that inserted described current system and last time is the current access device that moves to of different system and UE when being a new access device, describedly obtains contextual specific implementation be from the entity of connecting system last time:

The entity of the new RAT system that inserts of UE obtains context to the entity of the old RAT system of UE and the entity of the 2nd RAT system;

Wherein, a described RAT represents the type of the system of the current access of UE; The 2nd RAT represents the type of the system that UE inserted last time, and the entity of new RAT system is represented the entity of the current access of UE, the entity of old RAT system represent that UE once inserted and with the RAT entity of current access entity same type.

Wherein, the entity of a RAT system of the current access of described UE obtains contextual specific implementation to the entity of the entity of the old RAT system of UE and the 2nd RAT system and is:

A new RAT entity obtains the context of described UE to the 2nd RAT entity; Send context request with, a new RAT entity to the old RAT entity of UE, the old RAT entity of UE is sent to a new RAT entity with the context of described UE.

B21, a new RAT entity send context request to the old RAT entity of UE;

The old RAT entity of B22, UE obtains the context of described UE to the 2nd RAT entity;

The context of context that the old RAT entity of B23, UE will obtain from described the 2nd RAT entity and the UE that self preserves is sent to a new RAT entity.

B31, a new RAT entity send context request to the 2nd RAT entity;

B32, the 2nd RAT entity obtain the context of described UE to the old RAT entity of UE;

The context of context that B33, the 2nd RAT entity will obtain from the old RAT entity of described UE and the UE that self preserves is sent to a RAT entity.

Wherein, before obtaining context, this method further comprises: after UE was registered to SAE, MME was registered to HSS, and SGSN will be as the virtual HSS of MME, and SGSN only is registered to this MME, and UE would subscribe to MME and SGSN;

If UE connecting system last time is SAE, current access system is 2G/3G, and the node that inserts is the SGSN of registered mistake, and then this method is:

SGSN obtains DY{C} from MME;

If UE connecting system last time is SAE, current access system is 2G/3G, and the node that inserts is the SGSN of unregistered mistake, and then this method is:

New SGSN obtains DY{C}, ST{C from described MME as virtual HSS, and S} obtains DY{S} from oldSGSN, and MME sets up related with new SGSN afterwards;

If last time, connecting system was SAE, current access be new MME node, then this method is:

NewMME obtains DY{C from oldMME, M}, and ST{C, S} obtains ST{M} from HSS, perhaps obtains whole context from old MME, and new afterwards MME sets up related with SGSN;

If last time, connecting system was 2G/3G, current access system is SAE, and the MME node that inserts is the MME of registered mistake, and then this method is:

MME obtains DY{C} from SGSN;

If last time, connecting system was 2G/3G, current access system is SAE, and the MME node of access is the MME of unregistered mistake, and then this method is:

New MME obtains DY{C} from SGSN, obtains DY{M} from old MME, ST{S} or ST{C, and S} obtains ST{M} or ST{C from HSS, M} or whole static context.New afterwards MME sets up related with SGSN;

If last time, connecting system was 2G/3G, the SGSN node that current access is new, then new SGSN obtains DY{C from old SGSN, and S} obtains ST{C from MME, S}, new SGSN sets up related with MME.

Wherein, this method further comprises:

Further carry CRN in described access request message, utilize this CRN, network entity understands whether this entity is preserved up-to-date context and determined whether will obtain context to other entities, and the occupation mode of this CRN is specially:

Step 1:UE inserts the access entity of RAT system, behind the renewal context, changes if insert the context of entity, upgrade the CRN that this entity self is preserved, and the CRN after will upgrading sends to UE;

Step 2:UE inserts one of RAT system and inserts entity, and this CRN is sent to this entity, if CRN and this CRN that this entity is preserved do not match, then obtains context from other entities, and upgrades the CRN that this entity is preserved; After the access entity is obtained up-to-date context once more, return execution in step 1.

As seen, beneficial effect of the present invention is: owing to adopt method provided by the present invention, can be according to contextual the obtaining of carrying out of last institute connecting system, therefore, can effectively avoid unnecessary context acquisition process, thereby make and contextually obtain easyly, efficient, and then help promoting the use of rapidly of SAE network technology.

Description of drawings

Fig. 1 is the schematic diagram of evolution architecture;

Fig. 2 is the schematic diagram of many RAT network configuration;

Fig. 3 is for realizing obtaining the flow chart of a contextual embodiment in the prior art;

Fig. 4 is for realizing obtaining the flow chart of a contextual embodiment in the prior art;

Fig. 5 is for realizing obtaining the flow chart of a contextual embodiment in the prior art;

Fig. 6 is for realizing obtaining the flow chart of a contextual embodiment in the prior art;

Fig. 7 is for realizing obtaining the flow chart of a contextual embodiment in the prior art;

Fig. 8 is the flow chart of one embodiment of the invention;

Fig. 9 is the flow chart of one embodiment of the invention;

Figure 10 is the flow chart of one embodiment of the invention;

Figure 11 is the flow chart of one embodiment of the invention;

Figure 12 is the flow chart of one embodiment of the invention;

Figure 13 is the flow chart of one embodiment of the invention;

Figure 14 is the flow chart of one embodiment of the invention;

Figure 15 is the flow chart of one embodiment of the invention;

Figure 16 is the flow chart of one embodiment of the invention.

Embodiment

In the present invention, because the system that UE inserted last time necessarily has up-to-date context, (because after the UE access, if the context of this entity is not up-to-date, get the operation of context), the UE information band that can be inserted last time is given network so, obtains context the entity that network based this information inserted from last time, and the context that obtains like this must be up-to-date.In addition, in the present invention, can also be according to the information that inserted last time dissimilar, obtain context in different ways.

Describe the present invention below in conjunction with specific embodiment.

In a preferred embodiment of the invention, context is segmented, it is decomposed into static part and dynamic part, static part is the context that SGSN or MME obtain from HSS in the attach process, as Forwarding information List, SGSN CAMEL Subscription Info etc., dynamic part remove static part SGSN or the MME context that action generates according to UE, as MM context such as RAI, SM context such as PDP Address etc.We are divided into Static to static part again, and { Common} (is called for short ST{S for SGSN, MME, M, C}), dynamic part also is divided into dynamic{SGSN, MME, Common} (is called for short DY{S, M, C}), represent respectively static part/or dynamic part in the distinctive context of SGSN, distinctive context of MME and public part.In general, the acquisition of static part is by the transfer (occurring in SGSN/MME change) between HSS reconstruction or the entity, and the acquisition of dynamic part is the method for synchronous (describing methods such as master-slave promptly) by context.

In the present invention, Zui You method can be summarized as follows:

ST can obtain from the process of reconstruction of HSS, that is, change new entity (SGSN or MME) and all will be registered to HSS, gets the information of ST then from HSS, as ST{C, and S} or ST{C, M}.

And, only keep ST{C at SGSN for minimum reservation context, and S} and DY{C, S} only keeps ST{C at MME, M} and DY{C, M};

In the present invention, the context between so-called MME and the SGSN is synchronous, is synchronous DY{C}.Its reason is to have only this part to transform between MME and SGSN.

And SGSN changes, and new SGSN also will get DY{S} from old SGSN, and in like manner, new MME gets DY{M} to old MME.

Below in conjunction with different concrete conditions, the flow process that the method for top optimum is obtained context describe in detail (is example with the Coordination method of synchronization):

One, the attach of UE elder generation is to MME:

The required dynamic context of MME obtains from HSS in the process of reconstruction of HSS, and promptly HSS generates ST{C, and M} also sends to MME; MME generates DY{M, C}; Then, MME keeps ST{C, M} and DY{M, C}.

Two, the Attach of UE elder generation is to MME, and then moves to SGSN

As shown in Figure 8, SGSN obtains DY{C} from MME, obtains ST{S from HSS, C}.SGSN generates DY{S}, and the context of reservation is: ST{S, and C}, DY{S, C}, up-to-date DY{C} is at SGSN.The idiographic flow of this kind situation is:

The original attach of step 800:UE is to SAE, when advancing into the 2G/3G network;

The SGSN of step 801:UE in the 2G/3G network initiates routing update (RA Update) request, carries the SAE system that inserted last time and identify for S-TMSI and the S-RA that this UE distributed in this request;

Wherein, S-TMSI represents the Temporary Mobile Subscriber Identity of SAE, and U-TMSI represents the Temporary Mobile Subscriber Identity of UMTS, and S-RA represents the RA of SAE, i.e. TA, and U-RA represents the RA of UMTS;

Step 802～step 803:SGSN is according to S-TMSI and S-RA, determine the Old MME that UE inserted last time, and to this Old MME transmission SGSN context request (context request) message, after OldMME receives this message, DY{C} is returned to SGSN by SGSN context response message, thereby realizes DY{C) between SGSN and MME synchronously;

Finish verification process by authentication (Authentication) message between step 804:SGSN and the UE;

Step 805:SGSN returns SGSN context to Old MME and confirms (ACK) message, and to confirm the current DY{C} of accurate synchronization, then, SGSN sets up related with MME; Wherein, the execution sequence of step 805 and step 804 does not influence realization of the present invention;

Step 806:SGSN sends the position to HSS and upgrades (Update Location) message, with notice HSS current UE position change has taken place;

Step 807～step 808:HSS sends Cancel location message to Old SGSN, and HSS is with the ST{C of this UE, and S} sends to SGSN by Insert Subscriber data message;

Step 809:SGSN upgrades successfully to HSS affirmation current location;

Wherein, step 806～809 change at SGSN, when just UE has moved to a SGSN who did not register, just carry out, that move to is the SGSN that registered last time if UE is current, and then execution in step 806～809 does not influence realization of the present invention;

Step 810:SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention;

Wherein, referring to Fig. 8, in other embodiment of the embodiment of the invention, if network can't be distinguished S-TMSI and U-TMSI, step 801 can also be carried RAT type sign, indicates the network that inserted last time by this sign, in the present embodiment, indicate that just the network that inserted last time is SAE, SGSN can send context request message according to the MME of this RAT type sign in SAE, can realize the present invention equally;

In addition, in the present invention one more excellent embodiment, can also further carry CRN in the RAUpdate of step 801 message, thereby further utilize this CRN to finish obtaining of context, the occupation mode of this CRN is as follows:

Step 1:UE inserts MME or SGSN, upgrade context after, push context changes if insert the context of entity (MME or SGSN), upgrades CRN that this entity self preserved (as CRN=CRN+1; CRN is a cycle values, reach the highest put minimum) and will upgrade after CRN send to UE (in real time or when connecting release);

Step 2:UE inserts a certain entity, this CRN is sent to this entity, if the CRN (Entity_CRN) of this entity of UE_CRN==, illustrate that then this entity keeps the up-to-date context (referring generally to DY{C}) of this UE, do not need to obtain context (referring generally to DY{C}) from other entities, otherwise, may need to obtain context from other entities, insert the CRN=UE_CRN of entity and renewal oneself.Return execution in step 1 afterwards.

Wherein, it should be noted that: when the relevant context of safety changed, necessary push context was to the other side.

By the way, can further simplify the acquisition process of context: the value according to CRN determines whether needs carry out obtaining of context, thereby avoids occurring the unnecessary situation of obtaining context.

Three, UE moves to MME from a last access network, wherein, this situation three times, the MME that the MME that UE moved to had registered for this UE:

If that UE inserted last time is exactly this MME, in the RA Update that UE sent, entrained sign is exactly to insert entity itself, and this entity can not got context again to SGSN and HSS, and this scheme is saved with respect to the Coordination mode and got the context operation;

If that UE inserted last time is 2G/3G, UE sends to network (send up as the sign U-TMSI/U-RA that 2G/3G is distributed, maybe all signs are sent to network, but the last network that inserts of indication is 2G/3G) with this information.MME gets DY{C} to SGSN, and MME context at this moment is DY{C, M}, ST{C, M}; Up-to-date DY{C} is at MME.

The method that combines with CRN if the CRN that CRN that UE upward sends out and MME preserve coupling needn't be got context, is got the context step thereby save; Such as, UE inserts MME and obtains up-to-date context, and UE inserts SGSN once more, but does not change context, and then UE inserts MME once more, uses the method for CRN just need not get context from SGSN again.

Wherein, if UE inserted last time is 2G/3G, then referring to shown in Figure 9, the idiographic flow that obtains context comprises:

Step 900:UE inserted the 2G/3G network last time, and this inserts the SAE network, moves to MME;

Step 901:UE sends RA Update message to MME, wherein:

In this message, only carry the entity SGSN that inserted last time and be the sign U-TMSI/U-RA that this UE distributed, perhaps,

In this message, only carry the sign that current access RAT distributes, S-TMSI/S-RA, so that in subsequent step, MME from the context that preserves (if MME is new access entity, new MME obtains the context from old MME) find corresponding SGSN in the corresponding related SGSN address information, so that from SGSN, obtain context, perhaps

In this message, carry all above-mentioned these signs.

The type RAT type etc. that also can also carry the entity that inserted last time in this message can represent to insert last time the information of entity type, so that in subsequent step, assist MME to find SGSN (can't distinguish UMTS to the sign of UE distribution and the sign of SAE distribution), the following describes with RATType as the information of distinguishing access style if insert entity;

Step 902～step 903:MME determines corresponding SGSN according to the entrained content of RA Update in the step 901, and sends SGSN context request message to this SGSN; This SGSN returns to MME with DY{C} by SGSN context response message, thereby realization DY{C}'s is synchronous;

Finish verification process alternately by authentication message between step 904:MME and the UE;

Step 905:MME sends SGSN contextACK message to SGSN, confirms context success synchronously;

Step 906:MME is that UE distributes new S-TMSI, S-RA, and this S-TMSI, S-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, MME can also further send to UE with former U-TMSI/RA, does not influence realization of the present invention;

In like manner, under this kind situation, also can further carry CRN in the RA of step 901 Update message, thereby further utilize this CRN to finish obtaining of context, it is identical with the CRN occupation mode of as above having described that it utilizes CRN to finish the mode of the embodiment of the invention.

As above shown in Figure 9, UE carries the entity that inserted last time, and SGSN, the U-TMSI/U-RA of distribution are to MME, and MME gets context according to this sign from SGSN.May also carry the type of the entity that inserted last time assists MME to find SGSN (can't distinguish UMTS to the sign of UE distribution and the sign of SAE distribution if insert entity).Perhaps, UE carries and inserts the sign that RAT distributes, and S-TMSI/S-RA, MME find corresponding SGSN in the corresponding related SGSN address information from the context that preserves, obtain context from SGSN.Perhaps UE carries these signs.UE may also carry CRN, if the CRN that CRN that UE carries and MME preserve coupling then needn't be got context to SGSN.(so step 902,903,905 is a dotted line).

Four, UE moves to SGSN, wherein, under this situation, the SGSN that the SGSN that UE moved to had registered for this UE:

If that inserted last time is SGSN, then needn't get context.If that inserted last time is MME, then the similar flow chart shown in Figure 9 of its executive mode is just changed SGSN and MME.

Five, UE moves to new SGSN, wherein, this new SGSN refers to: UE has moved to the SGSN that a last time do not register;

Can be divided into two kinds of subcases under this situation again:

Subcase one:

If the entity that inserted last time is that SGSN:new SGSN gets DY{C from old SGSN, S} gets ST{C from HSS, S}; Related with MME foundation, referring to Figure 10, realize under this kind situation that obtaining of context may be summarized to be:

If that inserted last time is 2G/3G, the 2G/3G that remains of this access has still changed a SGSN, new SGSN gets the DY{C of context to old SGSN so, S}, new SGSN is to HSS register requirement ST{C afterwards, the context of S} sets up related (understand the MME address information from the context that old SGSN gets, or obtain the address information of MME by the S-TMSI/S-RA that UE carries) with MME at last.

Wherein, the function of each step is identical or similar with the function of corresponding steps among Fig. 8, Fig. 9 in the specific implementation of above-mentioned Figure 10, specifically comprises:

Step 1000:UE inserted the 2G/3G network last time, and this moves to new new SGSN;

Step 1001:UE sends RA Update message to new SGSN, wherein:

In this message, only carry the entity SGSN that inserted last time for the sign U-TMSI/U-RA that this UE distributed, obtain context so that inserted entity from last time, and further according to this context understand the opposing party's RAT entity address message or,

Only carrying current access RAT in this message is the sign that UE distributed, U-TMSI/U-RA, so that in subsequent step, new SGSN can obtain context from old SGSN according to this sign, thereby further understands the MME address information, perhaps,

In this message, carry all above-mentioned these signs.

Perhaps, in this message, also carry the type RAT type of the entity that inserted last time, so that in subsequent step, assist new SGSN to find the entity that inserted last time.

Step 1002:new SGSN sends SGSN context request message according to correlated identities entrained among the RAUpdate to old SGSN, and request obtains context;

Step 1003:old SGSN is with dynamic context DY{C, and S} returns to new SGSN by SGSN context response message;

It is mutual that step 1004:new SGSN and UE carry out authentication message, finishes verification process;

Step 1005:new SGSN returns SGSN context ACK message to old SGSN, confirms the updating context success;

Step 1006: because UE moves to new new SGSN, therefore, trigger position is new technological process more, sends the position to HSS and upgrades (Update Location) message;

Step 1007:HSS sends cancel location message to old SGSN;

Step 1008:HSS and new SGSN carry out interacting message, and with the static context ST{C of this UE, S} sends to new SGSN by Insert subscriber data message;

Step 1009:new SGSN and HSS carry out interacting message, inform that the HSS position upgrades successfully;

Step 1010:new SGSN and MME carry out Association setup interacting message, set up related between MME and this new SGSN;

Step 1011:new SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, new SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention.

In like manner, under this kind situation, also can further carry CRN in the RA of step 1001 Update message, thereby further utilize this CRN to finish obtaining of context, it is identical with the CRN occupation mode of as above having described that it utilizes CRN to finish the mode of the embodiment of the invention.

Similarly, in this case, entrained sign can comprise that also the RAT that the RAT of this access is the UE sign of distributing, inserted last time is sign that UE distributed, shows that the sign or the three of the type of the RAT that inserted last time all carry in the RA Update message, wherein:

If adopting UE only to carry this access RAT is the sign that UE distributed, so as shown in figure 10, UE carries U-TMSI/U-RA and is identified to network, obtains context according to this sign from old SGSN.

If adopting UE only to carry the RAT that inserted last time is the sign that UE distributed, UE also carries U-TMSI/U-RA to network (because that access last time is exactly 2G/3G).

Subcase two:

If the entity that inserted last time is that MME:new SGSN obtains DY{C} from MME, new SGSN obtains DY{S} from old SGSN; Because SGSN is unregistered SGSN last time, therefore, new SGSN also needs to obtain ST{C from HSS, S}.Flow process as shown in figure 11, wherein, the function of concrete message is identical or similar with the function of corresponding steps among Fig. 8, Fig. 9 in each step, specifically comprises:

Step 1100:UE inserted the SAE network last time, and this moves to new new SGSN;

Step 1101:UE sends RA Update message to new SGSN, wherein:

In the present embodiment, RAUpdate message is only carried this and is inserted the sign that RAT distributes,, then the realization principle of subsequent step is: UE inserts new SGSN, and new SGSN finds self not have the context of UE, then obtain old SGSN address according to entrained U-TMSI in the RA Update message, get the context request to old SGSN transmission,, register to HSS again with acquisition request DY{S}, obtain ST{C, S}.Address information by understanding MME among the context that obtains or obtain up-to-date DY{C} by the address information that the S-TMSI/S-RA that UE sends understands MME; The specific implementation subsequent step of this principle will embody;

After step 1102:new SGSN receives RA Update message, find self not have the context of UE, then obtain old SGSN address, send SGSN context request message to old SGSN, with acquisition request DY{S} according to entrained U-TMSI in the RA Update message;

Step 1103:old SGSN returns to newSGSN with DY{S} by SGSN context response message;

It is mutual that step 1104:new SGSN and UE carry out authentication message, finishes verification process;

Step 1105:new SGSN returns SGSN contextACK message to old SGSN, confirms the updating context success;

Step 1106: because UE moves to new new SGSN, therefore, trigger position is new technological process more, sends the position to HSS and upgrades (Update Location) message;

Step 1107～step 1109 is identical with above-mentioned steps 1007～step 1009, is not described in detail at this;

Step 1110: because UE inserted last time is SAE, and therefore, new SGSN sends SGSN context request message by understanding the address information of MME among the context that obtains to MME, with request acquisition context; MME returns to new SGSN with up-to-date DY{C} by SGSN context response message;

Step 1111:new SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; New SGSN sets up related with MME; Wherein, in embodiments of the present invention, in this step, new SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention.

Wherein, in other embodiments of the invention, the RA Update of step 1101 is other signs of portability also, and according to entrained sign difference, subsequent step meeting respective change, existing in conjunction with entrained sign difference, the specific implementation that 2 times context of above-mentioned subcase obtain is carried out the generality description:

If in RA Update message, only carry the RAT that inserted last time, SAE just, the sign S-TMSI/S-RA that is distributed, flow process then shown in Figure 11 should be mutually: the S-TMSI/S-RA that new SGSN sends by UE obtains the context of MME earlier, as DY{C}, from the context that obtains, obtain the address information of old SGSN again, from old SGSN, obtain DY{S}, be registered to HSS again and obtain ST{C, S}.

Even also can be:

If in RAUpdate message, only carry the RAT of this access, 2G/3G just, the sign U-TMSI/U-RA that is distributed, new SGSN sends the context request according to this sign to old SGSN, after old SGSN obtains context DY{C} from MME more then, with up-to-date context DY{C, S} issues new SGSN.

Perhaps, if in RA Update message, only carry the RAT that inserted last time, just SAE, the sign S-TMSI/S-RA that is distributed, new SGSN sends the context request to MME, and MME gets DY{S} from old SGSN more then, with up-to-date context DY{C, S} issues new SGSN.

Similar with the mode of as above having described, also can realize the present invention under this situation in conjunction with CRN, be specially:

If the entity that inserts does not have context, directly get context from old SGSN, relatively CRN if coupling (CRN that preserves as the CRN and the access entity of UE transmission is identical) needn't be got context to MME, only sets up association; Or CRN issued old SGSN, and if old SGSN CRN coupling is then sent out DY{S, C} gives new SGSN, otherwise only sends out DY{S}, after new SGSN received, whether decision got context to MME once more; Perhaps CRN is issued old SGSN, if old SGSN CRN coupling is then sent out DY{S, C} gives new SGSN, otherwise old SGSN gets DY{C} from MME, and again with DY{C, S} issues new SGSN.

Six, UE moves to new MME

If the entity that inserted last time is SGSN, new MME gets DY{C} from SGSN; Get DY{M} from oldMME again; Get ST{M from HSS, C}.

If the entity that inserted last time is MME, new MME is from old MME:DY{C, M}, and ST{M, C} obtains from HSS, and foundation and Old SGSN's is related.

It is similar that both of these case and UE move to the technology of describing in the accompanying drawing corresponding under the new SGSN situation, only needs the corresponding content of 2G/3G system and the corresponding content exchange of SAE system are got final product.

Seven, the attach of UE elder generation is to SGSN:

In the case, the attach of UE elder generation is to SGSN, and SGSN is registered to HSS, and SGSN obtains ST{C from HSS, S}, and SGSN self generates DY{C, S}.

Eight, the attach of UE elder generation moves to MME again to SGSN:

UE sends the sign that inserted last time, and promptly U-TMSI/U-RA is to MME, and MME obtains up-to-date context:DY{C} according to this sign from SGSN, and MME is registered to HSS again, obtains ST{C from this HSS, M}, and MME generates the ST{M} of self.The context that preserves at MME is at last: ST{M, C}, DY{C, M}.Wherein, if DY{C} changes, then the DY{C} that preserves among the MME is up-to-date.Wherein, under this situation under realization of the present invention and the above-mentioned second kind of situation realization of the present invention similar, difference only is: the corresponding content of the corresponding content of 2G/3G system and SAE system is exchanged.

Or UE itself is the sign that will send this access, but because have not yet registered SAE, therefore still sends the sign of having distributed, i.e. U-TMSI/U-RA.

Even can be, UE carries the sign of this access, be S-TMSI/S-RA, if the MME of MME during with UE detach is different, then obtain the IMSI of UE, be registered to HSS again, from the context that HSS obtains, understand the address information that UE has been registered to SGSN from old MME, obtain context from SGSN, set up related.

In embodiment as mentioned above, describe SGSN and only keep ST{C, S}, DY{C, S}, MME only keep ST{C, M}, DY{C, the scene of M}, and think that preserving type is more excellent, because can not enter another kind of access technology again after might UE being registered to a kind of access technology, needn't keep unwanted context so.But, consider that UE may get context from a plurality of entities at entity of access.If UE inserts an entity, obtain all DY, so can not occur not only having got the situation of context from SGSN but also from MME.Insert MME as UE, that inserted last time is SGSN, and SGSN is with DY{C so, and S} issues MME.UE inserts new SGSN again and just needn't get context to old SGSN like this.

Below in conjunction with the different situations that comprise for example above-mentioned all contexts of preservation, specific implementation of the present invention is described respectively.

(1), UE inserts earlier MME, and then inserts new SGSN, and entity keeps all dynamic contexts (DY{all}), referring to Figure 12, specifically may further comprise the steps:

Step 1200:UE inserted the MME of SAE network last time, and this moves to new new SGSN;

Step 1201:UE sends RA Update message to new SGSN, wherein, carries label manner and can adopt and the similar mode of embodiment as mentioned above in this message;

After step 1202:new SGSN receives RA Update message,, send SGSN context request message to MME according to entrained sign in the RA Update message; Owing to preserved all dynamic contexts on the MME, therefore,, need not new SGSN in the present embodiment and obtain DY{S} to old SGSN request with respect to Figure 11;

With DY{C, S, M} return to new SGSN to step 1203:MME by SGSN context response message;

It is mutual that step 1204:new SGSN and UE carry out authentication message, finishes verification process;

Step 1205:new SGSN returns SGSN context ACK message to MME, confirms the updating context success; New SGSN sets up related with MME;

Step 1206～step 1209 is identical with step 1106～step 1109, no longer is repeated in this description at this.

Step 1210 is identical with step 1111, no longer is repeated in this description at this.

In the described scheme of Figure 12, UE inserts MME earlier, insert new SGSN again, then get context DY{all} to MME, why also get DY{M}, be for when UE inserts new MME again, can only obtain context and get final product, thereby avoid not only wanting context to old MME but also to SGSN to SGSN.

Wherein, this embodiment just inserts MME earlier at UE, and then insert the description of specific implementation of the present invention under the new SGSN situation, in like manner, for eight kinds of situations as above having described, also can adopt respectively with the similar mode of this embodiment and be realized.

(2) be that SGSN and MME obtain ST from HSS above us, also may SGSN and the entity that inserts from last time of MME or old SGSN or MME obtain ST.

Get under the situation of ST from other entity (non-HSS) at SGSN or MME, SGSN and MME can keep all context, i.e. ST{all}, and DY{all} also can only preserve own relevant context, as SGSN preservation ST{C, S}, DY{C, S}; MME preserves ST{C, M}, DY{C, M}.Perhaps, the context that SGSN keeps oneself is ST{C, S}, DY{C, S}; And MME keeps all context, and such scene is to be applied in to change SGSN not to the HSS registration, only gets context to the entity of last access, need register to HSS and change MME.

SGSN or MME keep under the situation of all context, and UE inserts under the situation of new SGSN, and that insert when last time is SGSN, and new SGSN gets ST{all} from old SGSN so, DY{all}, and need not again from HSS obtain ST (C, S); New SGSN sets up relatedly with MME again, in addition, why gets context{all}, is in order to allow UE move to new MME again, the context that can directly be correlated with to newMME transmission MME from SGSN, and flow process is as follows:

That inserted last time as UE is MME, and new SGSN gets context{all} from MME, is established to the association of MME.Context (the present invention does not limit the deletion of context) by HSS or MME deletion old SGSN.Flow process is as shown in figure 13:

Referring to Figure 13, specifically may further comprise the steps:

Step 1300:UE inserted the MME of SAE network last time, and this moves to new new SGSN;

Step 1301:UE sends RA Update message to new SGSN, wherein, carries label manner and can adopt and the similar mode of embodiment as mentioned above in this message;

After step 1302:new SGSN receives RA Update message,, send SGSN context request message to MME according to entrained sign in the RA Update message; Owing to preserved all dynamic and static contexts on the MME, therefore,, need not newSGSN in the present embodiment and obtain DY{S} to old SGSN request with respect to Figure 11 and Figure 12, also need not to obtain ST{C from HSS, S};

Step 1303:MME by SGSN context response message with its DY{C that preserves, S, M} and ST{C, S, M} return to new SGSN;

It is mutual that step 1304:new SGSN and UE carry out authentication message, finishes verification process;

Step 1305:new SGSN returns SGSN context ACK message to MME, confirms the updating context success; New SGSN sets up related with MME;

Step 1306:MME sends Cancel Location message to old SGSN;

Step 1307:new SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, new SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention.

As shown in figure 13, new SGSN needn't obtain static context from HSS again, directly obtains from MME.In addition, because in step 1303, new SGSN obtains DY{all} and ST{all} from MME, therefore, and can be so that UE when SAE is linked into new SAE again, can only obtains corresponding context from SGSN, and need not to obtain context from old MME again.

Also can be that the new entity that inserts obtains all dynamic context from the entity that inserted last time, and obtains static context (if newly inserting entity changes, otherwise need not get static context to HSS) from HSS.

Lift the context that SGSN and MME keep oneself again, do not get the example of static context to HSS, the same flow process, UE inserts MME earlier, inserts new SGSN again, referring to Figure 14, specifically comprises:

Step 1400:UE inserted the MME of SAE network last time, and this moves to new new SGSN;

Step 1401:UE sends RA Update message to new SGSN, wherein, carries label manner and can adopt and the similar mode of embodiment as mentioned above in this message;

After step 1402:new SGSN receives RA Update message,, understand MME and be the entity that UE inserted last time, to MME transmission SGSN contextrequest message according to entrained sign in the RA Update message;

Step 1403:MME returns to new SGSN by SGSN context response message with DY{C} and ST{C};

It is mutual that step 1404:new SGSN and UE carry out authentication message, finishes verification process;

Step 1405:new SGSN returns SGSN context ACK message to MME, confirms the updating context success; New SGSN sets up related with MME;

Step 1406:new SGSN is according to the entrained sign of RA Update message in the step 1401, determine the address of old SGSN, send SGSN context request message to old SGSN, obtain the context (ST{S} and DY{S}) relevant with SGSN with request; Wherein, owing to preserve the context of self on the SGSN, therefore, need not to obtain ST{S} from HSS again;

Step 1407:old SGSN returns to new SGSN by SGSN context response message with DY{S} and ST{S};

Step 1408:new SGSN returns SGSN contextACK message to old SGSN, confirms the updating context success; Wherein, in the preferred embodiment of the present invention, can also further trigger the flow process of old SGSN deletion context, not influence realization of the present invention;

Step 1409:new SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, new SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention.

As shown in figure 14, if SGSN or MME preserve the context of self, obtain context from MME so and can't obtain DY{S} and ST{S}, can only obtain from old SGSN, top flow process also may be to obtain ST{S from old SGSN, C} and not be used in MME and obtain ST{C}.

In addition, the parameter that UE inserts in the top flow process can be S-TMSI/S-RA and/or U-TMSI/U-RA, in fact UE can carry all signs, perhaps, UE is only to carry the sign of the entity transmission that inserted last time, inserted last time as UE and to be SAE, then S-TMSI/S-RA is carried in this access, gets context with the entity that inserted to last time.Perhaps UE also can only carry the sign of the entity distribution of this access, the behavior of bimodulus UE is identical with single mode like this, has only UE certain connecting system that has not yet registered, just can carry other signs, as shown in figure 15, in Figure 15, ST obtains from HSS, each entity keeps minimum context, specifically comprises the steps:

Step 1500～step 1503:UE start is registered to the 2G/3G network;

UE moves, from the 2G/3G network insertion to SAE;

Step 1504:UE sends Routing Area Update message (RAU) to MME, because current UE only inserted the 2G/3G network, does not insert SAE, therefore, carries the sign U-TMSI/U-RA that distributes to UE in this message;

Step 1505:MME determines the address of oldSGSN according to U-TMSI/U-RA entrained in the routing update message, and sends SGSN context request message to this old SGSN, obtains relevant context with request;

Step 1506:old SGSN returns to MME by SGSN context response message with DY{C};

Step 1507:MME obtains corresponding ST{C, M} from HSS;

UE moves to the 2G/3G network again, inserts SGSN;

Step 1508:UE sends RA Update message to new SGSN, carries the sign U-TMSI that system has distributed for UE in this message, U-RA;

Step 1509:new SGSN sends SGSN context request message to old SGSN, and request obtains corresponding context;

Step 1510:old SGSN returns to new SGSN by SGSN context response message with the address information of DY{S} and MME;

Step 1511:new SGSN sends SGSN context request message to MME, and request obtains corresponding context;

Step 1512:MME returns to newSGSN (because the entity that inserted last time is MME, DY{C} is up-to-date at the MME place) by SGSN context response message with DY{C}; New SGSN sets up related with MME;

It is mutual to carry out authentication message between step 1513:new SGSN and the UE, finishes verification process;

Step 1514:HSS generates ST{C, S}, and by with the Register SGSN interacting message of new SGSN with this ST{C, S} sends to new SGSN; Wherein, in a preferred embodiment of the invention, also can further trigger old SGSN deletion context;

Step 1515:new SGSN is that UE distributes new U-TMSI, U-RA, and this U-TMSI, U-RA are sent to UE; Wherein, in embodiments of the present invention, in this step, new SGSN can also further send to UE with former S-TMSI/RA, does not influence realization of the present invention.

As can be seen from Figure 15, to RAU, when UE did not distribute corresponding sign, UE inserted and carries the sign of having distributed UE from the attach process, otherwise UE inserts the sign that system distributed of carrying this access.

If UE only carries the sign of the system assignment that inserted last time, so in above-mentioned steps 1508-1514, new SGSN obtains the address information of MME earlier by entrained sign in the RA Update message, obtain context according to this address information to MME, and obtain the address information of old SGSN, obtain DY{S} to oldSGSN again.

In fact, UE also can carry the sign that this connecting system distributes always in access, as in above-mentioned steps 1504, UE can carry sign (old S-TMSI/S-RA) the access SAE system that SAE distributes, MME is registered to HSS then, obtain the registered SGSN of UE address from HSS, obtain DY{C} again from SGSN.Shown in 16 figure, specifically may further comprise the steps:

Step 1600～step 1603 is identical with above-mentioned steps 1500～step 1503;

UE moves, from the 2G/3G network insertion to SAE;

Step 1604: because in the present embodiment, UE carries the sign that this connecting system distributes always in access, therefore, in this step, UE carries the sign old S-TMSI/S-RA access SAE system that SAE distributes, be specially: UE sends Routing Area Update message (RAU) to MME, and carrying the original SAE network that inserts of UE in this message is the sign old S-TMSI/S-RA that UE distributes; Wherein, in the present embodiment, the prerequisite of carrying this old S-TMSI/S-RA is that UE has the SAE parameter of preserving when detach, and the described subsequent step of present embodiment all changes performed at MME;

Step 1605a:new MME sends Identification Request message to the old MME of old S-TMSI/S-RA sign, to the IMSI International Mobile Subscriber Identity (IMSI) of old MME request UE;

Step 1605b:Old MME finds corresponding UE information according to old S-TMSI, and IMSI is sent back to newMME;

Step 1606a:new MME finds the HSS at UE place according to the IMSI of UE, sends registration message;

Step 1606b:HSS is with the ST{C of UE, and the address information of the SGSN of M} and UE registration sends to newMME;

Step 1607a:new MME sends the context request message according to the address information of the SGSN of UE registration to old SGSN;

Step 1607b:old SGSN returns context (DY{C}) to new MME;

UE moves to the 2G/3G network again, inserts SGSN;

Step 1608～step 1615 is identical with above-mentioned steps 1508～step 1515, no longer is repeated in this description at this.

This method can also be applied in the another kind of scene, in this scene, after UE is registered to SAE, MME is registered to HSS, and SGSN regards MME as HSS, and can obtain static context from MME (is that HSS only registers MME, SGSN is registered to MME, and UE would subscribe to MME and SGSN).

Like this, if UE inserted SAE last time, insert 2G/3G afterwards, if the node that inserts is the SGSN of registered mistake, SGSN obtains DY{C} from MME, does not obtain context from other nodes.

If inserted SAE last time, insert 2G/3G afterwards, if the node that inserts is the SGSN of unregistered mistake, new SGSN obtains DY{C}, ST{C from MME so, S} (it is HSS that MME is treated as) obtains DY{S} from old SGSN, does not get context to HSS.MME sets up related with new SGSN afterwards.

If inserted SAE last time, what insert specifically is new MME node, and new MME obtains DY{C from oldMME so, M}, and ST{C, S} obtains ST{M} from HSS, perhaps obtains whole context from old MME.New afterwards MME sets up related with SGSN.

If inserted 2G/3G last time, insert SAE afterwards, the MME node of access is the MME of registered mistake, then MME obtains DY{C} from SGSN, does not obtain context from other nodes.

If inserted 2G/3G last time, insert SAE afterwards, the MME node of access is the MME of unregistered mistake, then new MME obtains DY{C} from SGSN, obtains DY{M} from old MME, ST{S} or ST{C, S} obtains ST{M} or ST{C from HSS, M} or whole static context.New afterwards MME sets up related with SGSN.

If inserted 2G/3G last time, insert new SGSN node afterwards, then new SGSN obtains DY{C from old SGSN, and S} obtains ST{C from MME, S}, new SGSN sets up related with MME.

In above-described embodiment, all can learn that whether DY{C} is that up-to-date determining whether obtained context from other entities at this entity according to CRN, in some cases, change as user contracting data, network insertion pattern change etc., HSS may need initiatively to revise the context of MME and/or SGSN, in this case, because the positional information of HSS record SGSN and two entities of MME, if HSS initiatively revises the data (we think that these data belong to static context) of UE, so directly sending to these two entities all makes amendment, CRN does not need to change simultaneously, needn't notify UE yet, and these two entities are kept static context separately.

Describe in addition, the access procedure that the present invention explained includes but not limited to location area updating, service request, page response, Detach etc.Specification is that example describes with the location area updating.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.

Claims

1, a kind of method of obtaining access system context is characterized in that, this method comprises:

2, method according to claim 1 is characterized in that, described system is network architecture evolution SAE system or 2G/3G system, further comprises before this method:

3, method according to claim 1 and 2, it is characterized in that the system of described current access is the first wireless access technology RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are dissimilar connecting systems, and this method comprises:

4, method according to claim 3 is characterized in that, described the 2nd RAT system is a System Architecture Evolution SAE system, and a described RAT system is the 2G/3G system, and this method comprises:

Step 800:UE attach last time is to SAE, current access 2G/3G network;

Step 804:SGSN sets up related with described MME.

5, method according to claim 4 is characterized in that, describedly shows that last time, connecting system was being designated of SAE system:

6, method according to claim 4 is characterized in that, describedly shows that last time, connecting system was being designated of SAE system:

7, according to claim 4,5 or 6 described methods, it is characterized in that this method further comprises:

8, method according to claim 3 is characterized in that, described the 2nd RAT system is the 2G/3G system, and a described RAT system is the SAE system, and this method comprises:

Step 8100:UE attach last time is to 2G/3G, current access SAE system;

Step 8102～step 8103:MME is according to the entrained sign of described access request, determines the Old SGSN that UE inserted last time, obtains DY{C} from this Old SGSN, realizes DY{C) between SGSN and MME synchronously;

Step 8104:MME sets up related with SGSN.

9, method according to claim 8 is characterized in that, describedly shows that last time, connecting system was being designated of 2G/3G system:

The 2G/3G system identifies for U-TMSI and the U-RA that this UE distributed.

10, method according to claim 8 is characterized in that, describedly shows that last time, connecting system was being designated of 2G/3G system:

11, according to Claim 8,9 or 10 described methods, it is characterized in that this method further comprises:

12, method according to claim 1 and 2, it is characterized in that, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are dissimilar connecting systems, and the access entity of the RAT system that UE moved to is the access entity that UE had registered, and this method comprises:

13, method according to claim 12 is characterized in that, described the 2nd RAT system is the 2G/3G system, and a described RAT system is the SAE system, and the MME in this SAE system is the MME that UE had registered, and this method comprises:

14, method according to claim 13 is characterized in that, describedly shows that last time, connecting system was being designated of 2G/3G system:

Perhaps,

15, method according to claim 12 is characterized in that, described the 2nd RAT system is the SAE system, and a described RAT system is the 2G/3G system, and the SGSN in this 2G/3G system is the SGSN that UE had registered, and this method comprises:

16, method according to claim 15 is characterized in that, describedly shows that last time, connecting system was being designated of SAE system:

Perhaps,

17, method according to claim 1 and 2, it is characterized in that, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are the connecting system of same type, and the access entity of the RAT system that UE moved to is the new access entity that UE did not register, and this method comprises:

18, method according to claim 17 is characterized in that, described the 2nd RAT system is the 2G/3G system, a described RAT system is the 2G/3G system, and UE moved to the SGSN that a last time do not register, and this method comprises:

19, method according to claim 18 is characterized in that, carries to show that last time, institute's connecting system was being designated of 2G/3G system in this message:

In this message, carry above-mentioned these signs.

20, method according to claim 17 is characterized in that, described the 2nd RAT system is the SAE system, a described RAT system is the SAE system, and UE moved to the MME that a last time do not register, and this method comprises:

Set up related between step 11005:new MME and the SGSN.

21, method according to claim 20 is characterized in that, in the step 11001, described carrying in this message shows that last time, institute's connecting system was being designated of SAE system:

In this message, carry above-mentioned these signs.

22, method according to claim 1 and 2, it is characterized in that, the system of described current access is a RAT system, the system that inserted described last time is the 2nd RAT system, the one RAT system and the 2nd RAT system are dissimilar connecting systems, and the access entity of the RAT system that UE moved to is the new access entity that UE did not register, and this method comprises:

23, method according to claim 22 is characterized in that, in the step 110, described carrying in this message shows being designated of institute's connecting system last time:

In this message, carry above-mentioned these signs.

24, method according to claim 22 is characterized in that, described the 2nd RAT system is the SAE system, a described RAT system is the 2G/3G system, and UE moved to the SGSN that a last time do not register, and this method comprises:

25, method according to claim 24 is characterized in that, describedly shows that last time, institute's connecting system was being designated of SAE system:

26, method according to claim 24 is characterized in that, describedly shows that last time, institute's connecting system was being designated of SAE system:

27, method according to claim 24 is characterized in that, describedly shows that last time, institute's connecting system was being designated of SAE system:

28, method according to claim 24 is characterized in that, describedly shows that last time, institute's connecting system was being designated of SAE system:

29, method according to claim 22 is characterized in that, described the 2nd RAT system is the 2G/3G system, a described RAT system is the SAE system, and UE moved to the MME that a last time do not register, and this method comprises:

30, method according to claim 29 is characterized in that, describedly shows that last time, institute's connecting system was being designated of 2G/3G system:

31, method according to claim 29 is characterized in that, describedly shows that last time, institute's connecting system was being designated of 2G/3G system:

New MME obtains DY{C} from SGSN earlier according to this U-TMSI/U-RA, and is registered to HSS and obtains ST{C, and M} obtains the address information of old MME from the context that obtains, obtain DY{M} from this old MME.

32, method according to claim 29 is characterized in that, describedly shows that last time, institute's connecting system was being designated of 2G/3G system:

New MME identifies according to described S-TMSI/S-RA, sends the context request to old MME, after old MME obtains context DY{C} from SGSN more then, with up-to-date context DY{C, M} issue new MME and, new MME is registered to HSS and obtains ST{C, M}.

33, method according to claim 29 is characterized in that, describedly shows that last time, institute's connecting system was being designated of 2G/3G system:

34, method according to claim 2 is characterized in that, described MME and/or SGSN preserve all dynamic context DY{all} respectively, and the entity of described current access system obtains described DY{all} from the entity of a last connecting system.

35, method according to claim 2, it is characterized in that, described MME and/or SGSN preserve all dynamic context DY{all} and all static context ST{all} respectively, and the entity of described current access system obtains described ST{all} and/or DY{all} from the entity of a last connecting system.

36, method according to claim 2, it is characterized in that, described MME and/or SGSN preserve dynamic context DY and static context ST separately respectively, the entity of described current access system that once inserted from UE with entity current access system connecting system of the same type obtain dynamic context and static context.

37, method according to claim 1, it is characterized in that, the system that inserted described current system and last time is the current access device that moves to of different system and UE when being a new access device, describedly obtains contextual specific implementation be from the entity of connecting system last time:

According to the described method of claim 37, it is characterized in that 38, the entity of a RAT system of the current access of described UE obtains contextual specific implementation to the entity of the entity of the old RAT system of UE and the 2nd RAT system and is:

According to the described method of claim 37, it is characterized in that 39, the entity of a RAT system of the current access of described UE obtains contextual specific implementation to the entity of the entity of the old RAT system of UE and the 2nd RAT system and is:

B21, a new RAT entity send context request to the old RAT entity of UE;

According to the described method of claim 37, it is characterized in that 40, the entity of a RAT system of the current access of described UE obtains contextual specific implementation to the entity of the entity of the old RAT system of UE and the 2nd RAT system and is:

B31, a new RAT entity send context request to the 2nd RAT entity;

41, method according to claim 2 is characterized in that, before obtaining context, this method further comprises: after UE was registered to SAE, MME was registered to HSS, and SGSN will be as the virtual HSS of MME, SGSN only is registered to this MME, and UE would subscribe to MME and SGSN;

SGSN obtains DY{C} from MME;

NewMME obtains DY{C from old MME, M}, and ST{C, S} obtains ST{M} from HSS, perhaps obtains whole context from old MME, and new afterwards MME sets up related with SGSN;

MME obtains DY{C} from SGSN;

42, according to claim 1,2,4～6,8～10,13～16,18～21,23～41 any described methods, it is characterized in that this method further comprises: