CN101494845B

CN101494845B - Method for recovery of context after user conceal separation, network element and system

Info

Publication number: CN101494845B
Application number: CN2008100070206A
Authority: CN
Inventors: 吴问付; 胡伟华; 陈中平
Original assignee: Huawei Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2008-01-25
Filing date: 2008-01-25
Publication date: 2011-04-20
Anticipated expiration: 2028-01-25
Also published as: CN101494845A

Abstract

The invention discloses a user implicit separated context recovery method, net element and system. The method in the invention comprises: mobile management net element of second network receives an information from user equipment, when learning that the user equipment is implicit separated according to the informatioin, obtaining the mobile management net element address of first network in at least one network according to the obtained identification information of at least one network except the second network of the user equipment; obtaining the context information of the user equipment from the mobile management net elements in the first network according to the obtained mobile management net element address of the first network; and recovering the context of the user equipment according to the obtained context information. The invention need not re-establish the context of user equipment, so the IP address used by the user equipment does not change, and the service used by the user before can also be used, thereby the user experience is improved.

Description

Method for recovery of context, network element and system after a kind of user concealed separation

Technical field

The invention belongs to communication technical field, relate in particular to method for recovery of context, network element and system after a kind of user concealed separation.

Background technology

3GPP has released a kind of brand-new evolvement network, with reference to Fig. 1, be evolution network framework schematic diagram in the prior art, this network comprises: the universal mobile telecommunications system land radio access web (E-UTRAN of evolution, Evolved UMTS Terrestrial Radio Access Network) 101, be used to realize all and the wireless function associated of evolvement network; Mobile management network element (MME, Mobility Management Entity) 106 is responsible for the mobile management of chain of command, comprises the management of user's bearer context and mobile status, distributing user temporary identity sign etc.; Service gateway entity (S-GW, Serving Gateway) 102 is the user's face anchor points between the 3GPPP access network, stops the interface of E-TURAN; Grouped data network gateway entity (P-GW, Packet Data Network Gateway) the 103rd, the user's face anchor point between 3GPP access network and the non-3 GPP access network network, the interface of termination and external packet data network (PDN, Packet DataNetwork); Strategy and billing function entity (PCRF, Policy and Charging RuleFunction) 105 are used for policy control decision and flow based charging controlled function; Home network server (HSS, Home Subscriber Server) 109 is used for storing user subscription information.

UMTS Terrestrial radio access network (UTRAN, UMTS Terrestrial Radio Access Network) 110 GSM EDGE Radio Access Network (GERAN,, GSM/EDGE Radio Access Network) 107, be used for realizing all and the wireless function associated of existing GPRS/UMTS network, service universal grouping wireless business supporting node (SGSN, Serving GPRS Supporting Node) 108, be used for realizing functions such as GPRS/UMTS network routing forwarding, mobile management, session management and user profile storage.

Non-3GPP IP access network 111 mainly is the access network of some non-SGPP tissue definition, as WLAN (wireless local area network) (WLAN, Wireless Local Area Network), micro-wave access global inter communication (WiMAX, Worldwide Interoperability for Microwave Access), code division multiple access inserts networks such as (CDMA, CodeDivision Multiple Access).

Authenticate, authorize charging (AAA, Authentication, Authorization and Accounting) server 104, be used for UE is carried out access authentication, mandate and billing function.

Be understandable that this network architecture does not also mean that final evolution network framework, last may with this framework difference to some extent, the present patent application file does not limit.

When the UE implicit detach, the way of taking in the prior art is as follows: in existing GPRS/UMTS network, when SGSN receives the Routing Area Update request (RAU that UE sends, Routing Area UpdateRequest) if the context of discovery UE is (as the mobile management (MM of UE after the message, MobilityManagement) context), in this SGSN, do not exist, illustrate that this UE is SGSN implicit detach user (restart cause the UE implicit detach as SGSN), then SGSN returns Routing Area Update refusal (RAUReject) message and gives UE, carry cause value " implicit detach (Implicitly Detached) " in the message, UE initiates attachment flow after receiving this message again.

In research and practice process to prior art, the inventor finds in the technique scheme, because UE need initiate attachment flow again, the PDP bearer context of UE needs to activate again, the IP address that causes UE to use changes, and then making previously used all business of UE all can not continue to use, business will be interrupted, and influence user experience.

Summary of the invention

The technical problem that the embodiment of the invention will solve provides method for recovery of context, network element and the system after a kind of user concealed separation, and making does not need to rebulid the context of UE, and previously used all business of UE can also continue to use.

For solving the problems of the technologies described above, method for recovery of context, network element and system embodiment after the user concealed separation provided by the present invention are achieved through the following technical solutions:

The embodiment of the invention provides the method for recovery of context after a kind of subscriber equipment implicit detach, and this method comprises:

The mobile management network element of second network receives the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of the described subscriber equipment that obtains at least one network except that second network, obtain the address of the mobile management network element of first network in described at least one network;

According to the address of the mobile management network element of first network that obtains, from the mobile management network element of first network, obtain the contextual information of described subscriber equipment;

Recover the context of described subscriber equipment according to the contextual information of the subscriber equipment that obtains.

The embodiment of the invention also provides a kind of mobile management network element, this network element comprises: message sink unit, User Status function-judging unit, user totem information acquiring unit, address acquisition unit, context acquiring unit, context recovery unit, wherein:

The message sink unit is used to receive the message that subscriber equipment sends;

The User Status function-judging unit is used to judge whether subscriber equipment is in the implicit detach state and whether uses idle pulley saving signaling or two registration;

The user totem information acquiring unit, be used to obtain when described User Status function-judging unit judgement learns that described user is in the implicit detach state and uses idle pulley saving signaling or two registration, obtain the identification information in the network of described subscriber equipment outside this mobility management unit belonging network;

Address acquisition unit is used for the described subscriber equipment that obtains according to the user totem information acquiring unit identification information at described network, obtains the address of the mobile management network element in the described network;

The context acquiring unit is used for the address of the mobile management network element that obtains according to address acquisition unit, obtains the context of described subscriber equipment from described mobile management network element;

The context recovery unit is used for the context that contextual information that based on context acquiring unit obtained recovers described subscriber equipment.

The embodiment of the invention also provides a kind of network system, and this network system comprises, the mobile management network element of subscriber equipment, first network and the mobile management network element of second network, wherein:

The mobile management network element of described second network, be used to receive the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the use idle pulley saving signaling that obtains or two user Equipment identification information, obtain the address of the mobile management network element of described first network at first network; Obtain the contextual information of described subscriber equipment according to described address, and recover the context of subscriber equipment according to described contextual information;

The mobile management network element of first network is used to preserve described user's contextual information.

As can be seen from the above technical solutions, the embodiment of the invention to the subscriber equipment implicit detach after, the mobile management network element of second network obtains the identification information of described subscriber equipment at least one network except that second network, obtain the address of the mobile management network element of first network in described at least one network, and according to the address of the mobile management network element of first network that is obtained, from the mobile management network element of first network, obtain the contextual information of subscriber equipment, recover the context of described subscriber equipment according to the user context information that obtains, method for recovery of context after this subscriber equipment implicit detach, do not need to rebulid the context of subscriber equipment, so the IP address that subscriber equipment uses does not change, therefore the previously used business of user can also continue to use, thereby can promote user's experience.

Description of drawings

Fig. 1 is a gradual network system configuration diagram in the prior art;

Fig. 2 is the one signaling process figure of the method for recovery of context embodiment after the subscriber equipment implicit detach in the embodiment of the invention;

Method for recovery of context embodiment two in Fig. 3 embodiment of the invention after the subscriber equipment implicit detach makes flow chart;

Method for recovery of context embodiment three signaling process figure in Fig. 4 embodiment of the invention after the subscriber equipment implicit detach;

Method for recovery of context embodiment four signaling process figure in Fig. 5 embodiment of the invention after the subscriber equipment implicit detach;

Method for recovery of context embodiment five signaling process figure in Fig. 6 embodiment of the invention after the subscriber equipment implicit detach;

Fig. 7 is a mobile management network element structural representation in the embodiment of the invention;

Fig. 8 is a network architecture schematic diagram in the embodiment of the invention.

Embodiment

The embodiment of the invention provides method for recovery of context, network element and the system after a kind of subscriber equipment implicit detach, this method does not need to rebulid user's context, therefore the IP address that can not cause subscriber equipment to use changes, the previously used business of user can also continue to use, thereby can promote user's experience.

This method for recovery of context is applicable to that the context that is carried out after the subscriber equipment implicit detach recovers, the mobile management network element of second network receives the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of the described subscriber equipment that obtains at least one network except that second network, obtain the address of the mobile management network element of first network in described at least one network; And from the mobile management network element of first network, obtain the contextual information of described subscriber equipment according to this address, recover the context of described subscriber equipment then according to the contextual information that obtains.Wherein, descriptions such as first network, second network just are used to distinguish different networks, do not represent a definite sequence.The mobile management network element of second network can obtain the identification information of subscriber equipment at least one network except that second network and get final product, and obtains for convenience, and described subscriber equipment can be based on ISR mechanism or two login mechanisms etc.Below at first idle pulley saving signaling (ISR, Idle mode SignalingReduction) mechanism and two login mechanism are introduced respectively:

Because in the overlapping or adjacent areas of different 3GPP inserting technology networks, UE changes connecting system at every turn, such as from GERAN/UTRAN to E-UTRAN, perhaps from E-UTRAN to GERAN/UTRAN, all need to initiate more new technological process of position, thereby give core net and eated dishes without rice or wine to bring certain load.For avoiding above-mentioned signaling traffic load, optimize the mobility management mechanism between the 3GPP different access systems, 3GPP has proposed ISR mechanism, and its main purpose is to reduce the mobile management flow process of UE between different access networks.Its main thought is: after UE is registered in SGSN and MME successively, can enable ISR, the route district RA and the tracking area TA at place when as long as UE does not leave its registration SGSN and MME, just do not need to initiate more new technological process of any position, even UE constantly changes like this, can not bring any signaling traffic load in 2G/3G and LTE sub-district yet.Even the RA at UE place or TA change, only otherwise change SGSN and MME, tracking area or Routing Area Update that UE initiates do not need to set up new registration procedure SGSN or MME to HSS yet.Unaffected for the called service that guarantees the user simultaneously, S-GW needs mark to enable the mobile subscriber of ISR, when the downlink data of receiving the user or signaling, initiates paging simultaneously to SGSN and MME, guarantees that the user can pagedly arrive.

Because in the overlapping or adjacent areas of different 3GPP inserting technology networks, UE changes connecting system at every turn, such as from GERAN/UTRAN to E-UTRAN, perhaps from E-UTRAN to GERAN/UTRAN, all need to initiate more new technological process of position, need to set up new registration procedure SGSN or MME, cause the load of HSS to increase to HSS.For avoiding top signaling traffic load, 3GPP has also proposed two login mechanisms, and its main purpose is that UE reduces the signaling traffic load between MME or SGSN and the HSS when mobile between different access networks.Its main thought is: UE registers in SGSN and MME, as long as UE does not leave the route district RA and the tracking area TA at its registration SGSN and MME place, tracking area or Routing Area Update that UE initiates can not cause MME or SGSN to set up new registration procedure SGSN or MME to HSS.Two login mechanisms can not reduce the load of eating dishes without rice or wine, but can reduce the load of core net, and simultaneously two login mechanisms do not need S-GW to handle yet, and S-GW only initiates paging to SGSN or MME after receiving downlink data or signaling.

For the purpose, technical scheme and the advantage that make the embodiment of the invention more cheer and bright, below with reference to accompanying drawing, be elaborated by specific embodiment:

With reference to Fig. 2, be the one signaling process figure of the method for recovery of context embodiment after the subscriber equipment implicit detach in the embodiment of the invention, below be elaborated by concrete steps:

Step 201, subscriber equipment (UE, User Equipment) send Routing Area Update request message or tracing section updating request message or the service request information mobile management network element to second network; The mobile management network element of second network can be the SGSN in the GERAN/UTRAN network, and what at this moment UE sent is Routing Area Update request (RAU Request) message; The mobile management network element of second network can be the MME in the E-UTRAN network, and what at this moment UE sent is tracing section updating request (TAU Request) message.

The mobile management network element of step 202, second network is the context of the temporary mark inquiry UE of UE distribution according to the mobile management network element of second network that UE carries; If the mobile management network element of second network does not inquire the context of UE, then the mobile management network element of second network is thought UE implicit detach, send Routing Area Update Reject message or tracing section updating refuse information or service-denial message to UE, carry cause value " Implicitly detached " in the message.

If the mobile management network element of second network is SGSN, then temporary mark is packet TMSI (P-TMSI, Packet Temporary Mobile Subscriber Identifier); If the mobile management network element of second network is MME, then temporary mark is global unique temporary identity (GUTI, Globally Unique Temporary Identity).

Step 203, UE judge whether UE uses the machine-processed or two login mechanisms of ISR after receiving above-mentioned Routing Area Update Reject message that the mobile management network element of second network sends or tracing section updating refuse information or service-denial message, if UE finds to use ISR mechanism or two login mechanisms, then UE initiates RAU Request or TAU Request message again, carries the identification information of UE at first network in the message;

The identification information of the UE that carries in the message in first network can be the temporary mark that UE distributes for: first network, also can be the positional information of UE in first network; Also can carry described temporary mark and positional information simultaneously.

If first network is the GERAN/UTRAN network, then temporary mark is P-TMSI; If first network is the E-UTRAN network, then temporary mark is GUTI.

If first network is the GERAN/UTRAN network, then positional information is Routing Area Identifier (RAI, Routing Area Identity); If first network is the E-UTRAN network, then positional information is tracking area identification (TAI, Tracking Area Identity).

If UE finds not use ISR mechanism or two login mechanisms, then UE initiates to adhere to (Attach) flow process.

The mobile management network element of step 204, second network obtains the mobile management network element address of first network according to the identification information of UE in first network, and sends the mobile management network element of context request message to first network according to described address;

The mobile management network element of step 205, first network returns the mobile management network element that context response information is given second network, the contextual information of UE is passed to the mobile management network element of second network;

The mobile management network element of first network is passed to the MM Context information of UE the mobile management network element of second network in this step.If have bearer context or the packet data protocol (PDP of UE in the mobile management network element of first network, Packet Data Protocol) context, the then mobile management network element of first network mobile management network element that bearer context information or the block data protocol context information of UE are passed to second network.

The mobile management network element of step 206, second network recovers the context of UE in the mobile management network element of second network according to the UE contextual information that obtains; The mobile management network element of second network returns the mobile management network element that context acknowledgement message is given first network;

For example, recover the MM Context that UE uses in second network.If comprise bearer context or the PDP Context of UE in the UE context that obtains, then recover bearer context or PDP Context that UE uses in second network.

ISR or the two registration operating position of the mobile management network element of second network decision UE, ISR or the two registration operating position of UE is notified to first network in context acknowledgement message mobile management network element.

The mobile management network element of step 207, second network sends the carrying request of revising (perhaps for revising the PDP Context request) message and gives S-GW, and the ISR operating position of UE is notified to S-GW;

If what recover is bearer context before, what the mobile management network element of second network sent in this step then is the bearing modification request message; If what recover is PDP Context before, what then the mobile management network element of second network sent in this step then is the PDP Context request message.

Step 208, S-GW return something for repairs to change and carry the mobile management network element of response (perhaps for revising the PDP Context response) message to second network;

The rapid request message of this step response message and previous step is corresponding.

The mobile management network element of step 209, second network returns Routing Area Update and accepts message or tracing section updating and accept message and give UE, and ISR or the two registration operating position of UE is notified to UE;

Step 210, UE return Routing Area Update and finish message or tracing section updating and finish the mobile management network element that message is given second network;

Step 211, optional, if the context of UE does not inquire in the mobile management network element of first network in the above-mentioned steps 5, then the mobile management network element of first network carries cause value " international mobile subscriber identity the unknown (IMSI not known) " to notify the mobile management network element UE of second network is unknown in the mobile management network element of first network in context response information.The mobile management network element of second network is received and is returned Routing Area Update Reject message after the above-mentioned message or the tracing section updating refuse information is given UE;

Step 212, UE initiate the Attach flow process after receiving above-mentioned refuse information, re-register the mobile management network element of second network.

From this embodiment as can be seen, when UE uses ISR mechanism or two login mechanism, if this user is in the implicit detach state, second network can be known the identification information of UE in first network according to the information that UE sends, and then obtain the address of the mobile management network element of first network, from this network element, obtain the contextual information of UE, and recover.Owing to do not need to rebulid the bearer context (or PDP Context) of UE, so the employed IP of UE address do not change, and the previously used business of UE can also continue to use, so can promote user's experience.

With reference to Fig. 3, the method for recovery of context embodiment two in the embodiment of the invention after the subscriber equipment implicit detach makes flow chart, below is elaborated by concrete steps:

Step 301, UE send Routing Area Update request message or tracing section updating request message or the service request information mobile management network element to second network, carry the positional information of UE in temporary mark, first network and second network of first network and the use of second network in the described request message;

The mobile management network element of second network can be the SGSN in the GERAN/UTRAN network, and what at this moment UE sent is Routing Area Update request (RAU Request) message; The mobile management network element of second network can be the MME in the E-UTRAN network, and what at this moment UE sent is tracing section updating request (TAU Request) message.

Step 302, when determining user concealed separations, the mobile management network element of second network sends the mobile management network element of context request message to first network of acquisition;

The mobile management network element of second network is the context of the temporary mark inquiry UE of UE distribution according to the mobile management network element of second network that UE carries.If the mobile management network element of second network does not inquire the context of UE, then the mobile management network element of second network is thought UE implicit detach.

Whether carry the identification information of UE in first network in the Routing Area Update request message that the mobile management network element judgement of second network is received or tracing section updating request message or the service request information, if do not carry the information of UE in first network in these message, then the mobile management network element of second network returns Routing Area Update Reject message or tracing section updating refuse information or service-denial message and gives UE; If carry the information of UE in first network in these message, then the mobile management network element of second network obtains the mobile management network element address of first network according to the identification information of UE in first network.

If the mobile management network element of second network is SGSN, then temporary mark is P-TMSI; If the mobile management network element of second network is MME, then temporary mark is GUTI.

UE comprises that at the identification information of first network UE is in the temporary mark of first network use and/or the positional information in first network.

The mobile management network element of step 303, first network returns the mobile management network element that context response information is given second network, the contextual information of UE is passed to the mobile management network element of second network;

The mobile management network element of first network is passed to the MM Context information of UE the mobile management network element of second network in this step.If have bearer context or the PDP Context of UE in the mobile management network element of first network, the mobile management network element of first network mobile management network element that bearer context information or the PDP Context information of UE are passed to second network then.

The mobile management network element of step 304, second network recovers the context of UE in the mobile management network element of second network and returns the mobile management network element that context acknowledgement message is given first network according to the UE contextual information that obtains;

The mobile management network element of step 305, second network sends the carrying request of revising (perhaps for revising the PDP Context request) message and gives S-GW, and the ISR operating position of UE is notified to S-GW;

Step 306, S-GW return something for repairs to change and carry the mobile management network element of response (perhaps for revising the PDP Context response) message to second network;

The mobile management network element of step 307, second network returns Routing Area Update and accepts message or tracing section updating and accept message or service and accept message and give UE, and ISR or the two registration operating position of UE is notified to UE.

If the temporary mark that step 308 UE uses changes, then UE returns that Routing Area Update is finished message or tracing section updating is finished the mobile management network element that message is given second network.

Step 309, optional, if the context of UE does not inquire in the mobile management network element of first network in the above-mentioned steps 303, then the mobile management network element of first network carries cause value " IMSI not known " to notify the mobile management network element UE of second network is unknown in the mobile management network element of first network in context response information, and the mobile management network element of second network is received and returned Routing Area Update Reject message after the above-mentioned message or the tracing section updating refuse information is given UE.

Step 310, UE initiate the Attach flow process after receiving above-mentioned refuse information, re-register the mobile management network element of second network.

With reference to Fig. 4, be the three signaling process figure of the method for recovery of context embodiment after the subscriber equipment implicit detach in the embodiment of the invention, below be elaborated by concrete steps:

Step 401, UE send Routing Area Update request message or tracing section updating request message or the service request information mobile management network element to second network;

The mobile management network element of step 402, second network is the context of the temporary mark inquiry UE of UE distribution according to the mobile management network element of second network that UE carries, if the mobile management network element of second network does not inquire the context of UE, then the mobile management network element of second network is thought UE implicit detach, send Routing Area Update Reject message or tracing section updating refuse information or service-denial message to UE, carry cause value " Implicitly detached " in the message;

After step 403, UE receive the above-mentioned Routing Area Update Reject message or tracing section updating refuse information or service-denial message that the mobile management network element of second network sends, judge whether UE uses the machine-processed or two login mechanisms of ISR.If UE finds to use ISR mechanism or two login mechanisms, then UE initiates RAU Request or TAU Request message again, and carrying first network in the message is temporary mark and the positional information of UE in first network that UE distributes.If UE finds that the bearer context (perhaps for PDP Context) in first network is not up-to-date, then to carry bearer context (perhaps PDP Context) information of mobile management network element UE in the mobile management network element of first network that indicating bit information notifies second network in RAU Request or TAURequest message be not up-to-date to UE;

If first network is the GERAN/UTRAN network, then positional information is RAI; If first network is the E-UTRAN network, then positional information is TAI.

UE can determine by the following method that the bearer context (perhaps PDP Context) in first network is not up-to-date:

If a. first network is the GERAN/UTRAN network, UE finds that P-TMSI is masked as in the context: " upgrading (not updated) " and needs " ISR is (ISR Synch) synchronously ", and then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date; If first network is the E-UTRAN network, UE finds that GUTI is masked as in the context: " not updated " and needs " ISR Synch ", then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date.

If b. first network is the GERAN/UTRAN network, UE finds that bearer update sign (Bearer Update Flag) is in the context: E-UTRAN, and then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date; If first network is the E-UTRAN network, UE finds that bearer update is masked as in the context: GERAN/UTRAN, then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date.

If c. first network is the GERAN/UTRAN network, UE finds that E-UTRAN bearer update indicating bit (Bearer Update Indication) is in the context: " correct (True) or be 1 ", perhaps, UE finds that GERAN/UTRAN bearer update indicating bit (Bearer UpdateIndication) is in the context: " (False) of mistake or be 0 ", and then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date; If first network is the E-UTRAN network, UE finds that GERAN/UTRAN bearer update indicating bit is in the context: " True or be 1 ", perhaps, UE finds that E-UTRAN bearer update indicating bit (Bearer Update Indication) is in the context: " False or be 0 ", then UE thinks that bearer context (perhaps PDP Context) information of UE in the mobile management network element of first network is not up-to-date.

It is not up-to-date that UE can notify bearer context (perhaps PDP Context) information of mobile management network element UE in the mobile management network element of first network of second network by the following method:

The updating type (UpdateType) that a.UE is provided with in RAU Request or the TAU Request message is " ISR Synch ";

B.UE carries the bearer update flag information in RAU Request message and this information setting is GERAN/UTRAN.Perhaps, UE carries the bearer update flag information and this information setting is E-UTRAN in TAU Request message;

C.UE carries GERAN/UTRAN bearer update indicating bit in RAU Request message and this indicating bit is set to True or be 1.Perhaps, UE carries E-UTRAN bearer update indicating bit and this indicating bit is set to True or be 1 in TAU Request message;

D.UE carries E-UTRAN bearer update indicating bit in RAU Request message and this indicating bit is set to False or be 0.Perhaps, UE carries GERAN/UTRAN bearer update indicating bit and this indicating bit is set to False or be 0 in TAU Request message.

If UE finds not use ISR mechanism or two login mechanisms, then UE initiates the Attach flow process.

The mobile management network element of step 404, second network is according to positional information and/or the UE temporary mark that in first network the use mobile management network element address that obtain first network of UE in first network.The mobile management network element of second network sends the mobile management network element of context request message to first network that obtains.If the mobile management network element of second network finds that bearer context or the PDP Context information of UE in the mobile management network element of first network are not up-to-date, then the mobile management network element of second network then can carry the bearer context (perhaps PDP Context) that the indication of indicating bit information only obtains the MM Context of UE or carry indicating bit information indication UE in context request message does not need to obtain.

In context request message, carry context as the mobile management network element of second network and obtain sign (Context Retrieval Flag) cell, and the mobile management network element of second network is provided with this cell for the MM contextual information that " MM Context Only " represents only to obtain UE, represents that perhaps the bearer context (perhaps PDP Context) of UE does not need to obtain.Perhaps, the mobile management network element of second network only carries in context request message that MM Context obtains MM contextual information that indicating bit (MM ContextRetrieval Indicator) expression only obtains UE or the bearer context (perhaps PDP Context) of expression UE does not need to obtain.Perhaps, the mobile management network element of second network carries in context request message that bearer context obtains indicating bit (Bearer Context RetrievalIndicator) and this cell is set to " False " or is 0), do not need to obtain with the bearer context (perhaps PDP Context) of expression UE.

The mobile management network element of step 405, first network returns the mobile management network element that context response information is given second network, the contextual information of UE is passed to the mobile management network element of second network;

The mobile management network element of first network is passed to the MM Context information of UE the mobile management network element of second network in this step.If have bearer context or the PDP Context of UE in the mobile management network element of first network, and the mobile management network element of second network is not indicated and is only obtained MM Context, then the mobile management network element of first network mobile management network element that bearer context information or the PDP Context information of UE are passed to second network.

The mobile management network element of step 406, second network recovers the context that UE uses according to the UE contextual information that obtains in second network, the mobile management network element of second network returns the mobile management network element that context acknowledgement message is given first network;

If the mobile management network element of second network finds that the bearer context information that UE carries in the mobile management network element that indicating bit information indicates first network is not up-to-date in RAU Request or TAURequest message, then the mobile management network element of second network only recovers the MM Context that UE uses in the mobile management network element of second network in this step, and bearer context or PDP Context do not recover in this step.

If the mobile management network element of step 407, second network finds that bearer context or PDP Context information that UE carries in the mobile management network element that indicating bit information indicates first network are not up-to-date in RAU Request or TAU Request message, then the mobile management network element of second network sends bearer context request message is obtained UE to S-GW bearer context or PDP Context information;

Step 408, S-GW return the mobile management network element that the bearer context response message is given second network, carry bearer context or the PDP Context information of UE in the message, the mobile management network element of second network recovers bearer context or the PDP Context of UE in second network according to bearer context that obtains or PDP Context information;

The mobile management network element of step 409, second network returns the bearer context acknowledge message to S-GW; The mobile management network element of second network can be in this message be notified to S-GW with the ISR operating position of UE.

If the mobile management network element of step 410 second network is not notified to S-GW with the ISR operating position of UE in step 409, then the mobile management network element of second network send to be revised carrying request (perhaps for revising the PDP Context request) message and is given S-GW, and the ISR operating position of UE is notified to S-GW.

Step 411, Serving GW return something for repairs to change and carry the mobile management network element of response (perhaps for revising the PDP Context response) message to second network;

The mobile management network element of step 412, second network returns Routing Area Update and accepts message or tracing section updating and accept message and give UE, and ISR or the two registration operating position of UE is notified to UE.

As can be seen, be with preceding two embodiment differences, when the bearer context in the mobile management network element of knowing first network or PDP Context information when not being up-to-date, can obtain bearer context or the PDP Context of UE from S-GW, and then bearer context or the PDP Context of recovery UE, do not need to rebulid bearer context or the PDP Context of UE equally, so the IP address that also can not cause UE to use changes, the previously used business of UE also can continue to use, and therefore can promote user's experience.

With reference to Fig. 5, be the four signaling process figure of the method for recovery of context embodiment after the subscriber equipment implicit detach in the embodiment of the invention, below describe by concrete steps:

Step 501, UE send Routing Area Update request message or tracing section updating request message or the service request information mobile management network element to second network, and it is up-to-date carrying positional information and UE bearer context or the PDP Context information in the mobile management network element of first network still be the mobile management network element of second network of UE in temporary mark, first network and second network that first network and second network use in the described request message;

Bearer context or the PDP Context information of the mobile management network element UE that UE can notify second network by the following method in the mobile management network element of first network still is the mobile management network element of second network is up-to-date:

The P-TMSI that a.UE is provided with in Routing Area Update request message or tracing section updating request message or the service request information is masked as: " not updated ", and updating type (Update Type) is set is: " ISR Synch " is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network; The GUTI that UE is provided with in Routing Area Update request message or tracing section updating request message or the service request information is masked as: " not updated ", and Update Type is set is: " ISR Synch " is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network;

B.UE carries the bearer update flag information in Routing Area Update request message or tracing section updating request message or service request information and this information setting is E-UTRAN, is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network; UE carries the bearer update flag information in Routing Area Update request message or tracing section updating request message or service request information and this information setting is GERAN/UTRAN, is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network;

C.UE carries GERAN/UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: True is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; UE carries E-UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: True is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network;

D.UE carries E-UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: False is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; UE carries GERAN/UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: False is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network.

Wherein first network is GERAN/UTRAN network or E-UTRAN network, and perhaps second network is that GERAN/UTRAN network or E-UTRAN network this patent do not limit.

The mobile management network element of step 502, second network is the context of the temporary mark inquiry UE of UE distribution according to the mobile management network element of second network that UE carries, if the mobile management network element of second network does not inquire the context of UE, then the mobile management network element of second network is thought UE implicit detach.Whether carry the identification information of UE in first network in the Routing Area Update request message that the mobile management network element judgement of second network is received or tracing section updating request message or the service request information, if do not carry the identification information of UE in first network in these message, then the mobile management network element of second network returns Routing Area Update Reject message or tracing section updating refuse information or service-denial message and gives UE; If carry the information of UE in first network in these message, then the mobile management network element of second network obtains the mobile management network element address of first network according to the identification information of UE in first network, and sends the mobile management network element of context request message to first network according to the mobile management network element address of first network;

The identification information of UE in first network comprises that UE is in the temporary mark of first network use and/or the positional information in first network.

If the mobile management network element of second network finds that the bearer context (perhaps PDP Context information) of UE in the mobile management network element of second network is up-to-date, then the mobile management network element of second network then can carry the bearer context (perhaps PDP Context) that the indication of indicating bit information only obtains the MM Context of UE or carry indicating bit information indication UE in context request message does not need to obtain.The concrete processing mode of indicating bit information is with the processing in the step 404.

The mobile management network element of step 503, first network returns the mobile management network element that context response information is given second network, the contextual information of UE is passed to the mobile management network element of second network;

The mobile management network element of step 504, second network recovers the context of UE in the mobile management network element of second network according to the UE contextual information that obtains, and the mobile management network element of second network returns the mobile management network element that context acknowledgement message is given first network;

If the mobile management network element of second network finds that bearer context or PDP Context information that UE carries in the mobile management network element that indicating bit information indicates second network are up-to-date in Routing Area Update request message or tracing section updating request message or service request information, then the mobile management network element of second network only recovers the MM Context that UE uses in the mobile management network element of second network in this step, and bearer context or PDP Context do not recover in this step.

If the mobile management network element of step 505, second network finds that bearer context or PDP Context information that UE carries in the mobile management network element that indicating bit information indicates second network are up-to-date in Routing Area Update request message or tracing section updating request message or service request information, then the mobile management network element of second network sends bearer context request message is obtained UE to S-GW bearer context or PDP Context information;

Step 506, S-GW return the mobile management network element that the bearer context response message is given second network, carry bearer context or the PDP Context information of UE in the message, the mobile management network element of second network recovers bearer context or the PDP Context of UE in second network according to bearer context that obtains or PDP Context information;

The mobile management network element of step 507, second network returns the bearer context acknowledge message to S-GW;

The mobile management network element of second network can be in this message be notified to S-GW with the ISR operating position of UE;

Step 508, optional, if the mobile management network element of second network is not notified to S-GW with the ISR operating position of UE in step 507, then the mobile management network element of second network send to be revised carrying request (perhaps for revising the PDP Context request) message and is given S-GW, and the ISR operating position of UE is notified to S-GW;

Step 509, S-GW return something for repairs to change and carry the mobile management network element of response (perhaps for revising the PDP Context response) message to second network;

The mobile management network element of step 510, second network returns Routing Area Update and accepts message or tracing section updating and accept message or service and accept message and give UE, and ISR or the two registration operating position of UE is notified to UE;

If the temporary mark that step 511 UE uses changes, then UE returns that Routing Area Update is finished message or tracing section updating is finished the mobile management network element that message is given second network.

With reference to Fig. 6, be the five signaling process figure of the method for recovery of context embodiment after the subscriber equipment implicit detach in the embodiment of the invention, below be elaborated by concrete steps:

Step 601, UE be registration and use ISR mechanism or two login mechanisms in the mobile management network element of first network and the 3rd network.UE sends Routing Area Update request message or the tracing section updating request message mobile management network element to second network then, and it is up-to-date carrying positional information and UE bearer context or the PDP Context information in the mobile management network element of first network still be the mobile management network element of three network of UE in temporary mark, first network and the 3rd network that first network and the 3rd network use in the described message;

Bearer context or the PDP Context information of the mobile management network element UE that UE can notify second network by the following method in the mobile management network element of first network still is the mobile management network element of the 3rd network is up-to-date:

A.UE is provided with P-TMSI in Routing Area Update request message or tracing section updating request message or the service request information and is masked as " notupdated " and Update Type is set and be " ISR Synch ", with bearer context in the mobile management network element of expression E-UTRAN network or PDP Context information is up-to-dately (if first network is the E-UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the E-UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date);

UE is provided with GUTI in Routing Area Update request message or tracing section updating request message or the service request information and is masked as " not updated " and Update Type is set and be " ISR Synch ", with bearer context in the mobile management network element of expression GERAN/UTRAN network or PDP Context information is up-to-dately (if first network is the GERAN/UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the GERAN/UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date);

B.UE carries the bearer update flag information in Routing Area Update request message or tracing section updating request message or service request information, and this information setting is E-UTRAN, with bearer context in the mobile management network element of expression E-UTRAN network or PDP Context information is up-to-dately (if first network is the E-UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the E-UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date);

UE carries the bearer update flag information in Routing Area Update request message or tracing section updating request message or service request information, and this information setting is GERAN/UTRAN, with bearer context in the mobile management network element of expression GERAN/UTRAN network or PDP Context information is up-to-dately (if first network is the GERAN/UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the GERAN/UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date);

C.UE carries GERAN/UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: True, with bearer context in the mobile management network element of expression GERAN/UTRAN network or PDP Context information is up-to-dately (if first network is the GERAN/UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the GERAN/UTRAN network, represent that then the bearer context information in the mobile management network element of the 3rd network is up-to-date);

UE carries E-UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information and this indicating bit is set to: True, with bearer context in the mobile management network element of expression E-UTRAN network or PDP Context information is up-to-dately (if first network is the E-UTRAN network, to represent that then the bearer context information in the mobile management network element of first network is up-to-date; If the 3rd network is the E-UTRAN network, represent that then the bearer context information in the mobile management network element of the 3rd network is up-to-date);

D.UE carries E-UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information, and this indicating bit is set to: False, with bearer context in the mobile management network element of expression GERAN/UTRAN network or PDP Context information is up-to-dately (if first network is the GERAN/UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the GERAN/UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date);

UE carries GERAN/UTRAN bearer update indicating bit in Routing Area Update request message or tracing section updating request message or service request information, and this indicating bit is set to: False, with bearer context in the mobile management network element of expression E-UTRAN network or PDP Context information is up-to-dately (if first network is the E-UTRAN network, to represent that then bearer context or the PDP Context information in the mobile management network element of first network is up-to-date; If the 3rd network is the E-UTRAN network, represent that then bearer context or the PDP Context information in the mobile management network element of the 3rd network is up-to-date).

The mobile management network element of step 602, second network at first obtains the contextual information of UE from the mobile management network element of similar first network of access style or the 3rd network;

As the second network insertion type is the GERAN/UTRAN network, and the first network insertion type is the GERAN/UTRAN network, and then the mobile management network element of second network at first obtains the contextual information of UE from the mobile management network element of first network; The second network insertion type is the E-UTRAN network, and the 3rd network insertion type is the E-UTRAN network, and then the mobile management network element of second network at first obtains the contextual information of UE from the mobile management network element of the 3rd network.Seemingly describe with the second network insertion type and the first network insertion class types in the present embodiment.The mobile management network element of second network is according to positional information and/or the UE temporary mark that in first network the use mobile management network element address that obtain first network of UE in first network.The mobile management network element of second network sends the mobile management network element of context request message to first network that obtains.

Also can select, only select at random not according to the mode of access style.

If the mobile management network element of second network finds that bearer context or the PDP Context information of UE in the mobile management network element of first network are not up-to-date, then the mobile management network element of second network then can carry the bearer context (perhaps PDP Context) that the indication of indicating bit information only obtains the MM Context of UE or carry indicating bit information indication UE in context request message does not need to obtain.The concrete processing mode of indicating bit information is with the processing in the step 404.

The contextual information that the mobile management network element of step 603, first network does not the inquire UE then mobile management network element of first network carries cause value " IMSI not known " to notify the mobile management network element UE of second network is unknown in the mobile management network element of first network in context response information;

The mobile management network element of step 604, second network is according to positional information and/or the UE temporary mark that in three network the use mobile management network element address that obtain three network of UE in the 3rd network, and sends the mobile management network element of context request message to the 3rd network according to described address;

If the mobile management network element of second network finds that bearer context or the PDP Context information of UE in the mobile management network element of the 3rd network are up-to-date, then the mobile management network element of second network then can carry the bearer context (perhaps PDP Context) that the indication of indicating bit information only obtains the MM Context of UE or carry indicating bit information indication UE in context request message does not need to obtain.The concrete processing mode of indicating bit information is with the processing in the step 404.

The mobile management network element of step 605, the 3rd network returns the mobile management network element that context response information is given second network, the contextual information of UE is passed to the mobile management network element of second network;

The mobile management network element of the 3rd network is passed to the MM Context information of UE the mobile management network element of second network in this step.If have bearer context or the PDP Context of UE in the mobile management network element of the 3rd network, and the mobile management network element of second network is not indicated and is only obtained MM Context, then the mobile management network element of the 3rd network mobile management network element that bearer context information or the PDP Context information of UE are passed to second network.

The mobile management network element of step 606, second network recovers the context of UE in the mobile management network element of the 3rd network according to the UE contextual information that obtains, and the mobile management network element of second network returns the mobile management network element that context acknowledgement message is given the 3rd network;

ISR or the two registration operating position of the mobile management network element of second network decision UE, ISR or the two registration operating position of UE is notified to the 3rd network in context acknowledgement message mobile management network element.

If it is not up-to-date in bearer context or the PDP Context information that Routing Area Update request message or tracing section updating request message carry in the mobile management network element that indicating bit information indicates the 3rd network that the mobile management network element of second network is found UE, then the mobile management network element of second network only recovers the MM Context that UE uses in the mobile management network element of second network in this step, and bearer context or PDP Context do not recover in this step.

If it is not up-to-date in bearer context or the PDP Context information that Routing Area Update request message or tracing section updating request message carry in the mobile management network element that indicating bit information indicates the 3rd network that the mobile management network element of step 607, second network is found UE, then the mobile management network element of second network sends bearer context request message is obtained UE to S-GW bearer context or PDP Context;

Step 608, S-GW return the mobile management network element that the bearer context response message is given second network, the bearer context or the PDP Context information of carrying UE in the message.The mobile management network element of second network recovers bearer context or the PDP Context of UE in second network according to bearer context that obtains or PDP Context information;

The mobile management network element of step 609, second network returns the bearer context acknowledge message to S-GW;

If the mobile management network element of step 610 second network is not notified to S-GW with the ISR operating position of UE in step 609, then the mobile management network element of second network send to be revised carrying request (perhaps for revising the PDP Context request) message and is given S-GW, and the ISR operating position of UE is notified to S-GW;

Step 611, S-GW return something for repairs to change and carry the mobile management network element of response (perhaps for revising the PDP Context response) message to second network;

The mobile management network element of step 612, second network returns Routing Area Update and accepts message or tracing section updating and accept message and give UE, and ISR or the two registration operating position of UE is notified to UE;

Step 613, optionally, if the temporary mark that UE uses changes, then UE returns that Routing Area Update is finished message or tracing section updating is finished the mobile management network element that message is given second network.

As can be seen, when the subscriber equipment registration in two networks and use ISR mechanism or two login mechanisms, can from these two networks, know the contextual information of UE, and then the context of finishing in the current network recovers.

And, when the bearer context in the mobile management network element of certain network or PDP Context information when not being up-to-date, user's bearer context or PDP Context information be can obtain from S-GW, and bearer context or PDP Context in the mobile management network element of this network recovered.

At three networks and three above network registries and use the situation of ISR mechanism or two login mechanisms, realization flow and above-mentioned flow process are similar, are not described in detail for subscriber equipment.

More than the method for recovery of context after the subscriber equipment implicit detach that the embodiment of the invention adopted is described in detail, for those skilled in the art being understood better and realize the embodiment of the invention, below mobile management network element and network system that the embodiment of the invention is adopted be described in detail:

With reference to Fig. 7, be mobile management network element structural representation in the embodiment of the invention, this network element comprises: message sink unit 701, User Status function-judging unit 702, user totem information acquiring unit 703, address acquisition unit 704, context acquiring unit 705, context recovery unit 706, wherein:

Message sink unit 701 is used to receive the message that subscriber equipment sends;

User Status function-judging unit 702 is used to judge whether subscriber equipment is in the implicit detach state and whether uses idle pulley saving signaling or two registration;

User totem information acquiring unit 703, be used to obtain when described User Status function-judging unit 702 judgements learn that described user is in the implicit detach state and uses idle pulley saving signaling or two registration, obtain the identification information in the network of described subscriber equipment outside this mobility management unit belonging network;

Address acquisition unit 704 is used for the described subscriber equipment that obtains according to user totem information acquiring unit 703 identification information at described network, obtains the address of the mobile management network element in the described network;

Context acquiring unit 705 is used for the address of the mobile management network element that obtained according to address acquisition unit 704, obtains the context of described subscriber equipment from described mobile management network element;

Context recovery unit 706 is used for the context that contextual information that acquiring unit 705 based on context obtained recovers described subscriber equipment.

From this embodiment as can be seen, when UE supports ISR mechanism or two login mechanism, if this user is in the implicit detach state, this mobile management network element can be known the identification information of UE in other registered network according to the information that UE sends, and then obtain the address of the mobile management network element of this registered network, from this network element, obtain the contextual information of UE, and recover.Owing to do not need to rebulid the bearer context (or PDP Context) of UE, so the employed IP of UE address do not change, and the previously used business of UE can also continue to use, so can promote user's experience.

This mobile management network element can also comprise: information notification unit is used for after recovering the context of described subscriber equipment described subscriber equipment being used the advisory subscriber equipment of idle pulley saving signaling or two registrations; And/or described subscriber equipment is used the advisory gateway of idle pulley saving signaling.

This mobile management network element can also comprise: the bearer context acquiring unit is used for obtaining from gateway the bearer context of subscriber equipment.

Below the network system that the embodiment of the invention adopted is described by specific embodiment:

With reference to Fig. 8, be network architecture schematic diagram in the embodiment of the invention, this network system comprises: the mobile management network element 802 of subscriber equipment 801, first network and the mobile management network element 803 of second network, wherein:

Subscriber equipment 801 is used for sending message to the mobile management network element of second network;

The mobile management network element 802 of first network is used to preserve described user's contextual information;

The mobile management network element 803 of second network, be used to receive the message that subscriber equipment 801 sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of subscriber equipment in first network of the use idle pulley saving signaling that obtains, obtain the address of the mobile management network element 802 of described first network; Obtain the contextual information of described subscriber equipment according to described address, and recover the context of subscriber equipment according to described contextual information.

From this embodiment as can be seen, when UE supports ISR mechanism or two login mechanism, if this user is in the implicit detach state, this network system can be known the identification information of UE in other registered network according to the information that UE sends, and then obtain the address of the mobile management network element of this registered network, from this network element, obtain the contextual information of UE, and recover.Owing to do not need to rebulid the bearer context (or PDP Context) of UE, so the employed IP of UE address do not change, and the previously used business of UE can also continue to use, so can promote user's experience.

Be understandable that, for subscriber equipment in the situation of the mobile management network element of two or more networks registration, also can be according to adopting this equipment to recover the bearer context of subscriber equipment, different is, should comprise the identification information of all registered networks in the message that UE sent, be not described in detail.

Above-mentioned network system also comprises gateway, at this moment, described subscriber equipment, be used for also determining whether the bearer context in the mobile management network element of certain network is up-to-date, and in the message that sends message to the mobile management network element of described second network, carry indication information, whether the bearer context that is used in reference in the mobile management network element that is shown in this network is up-to-date;

The mobile management network element of described second network, when also being used for determining that according to the indication information of described message bearer context in the mobile management network element of this network or PDP Context are not up-to-date, obtain the bearer context or the PDP Context information of described subscriber equipment from gateway, recover bearer context or the PDP Context of subscriber equipment in second network;

Described gateway, the bearer context or the PDP Context information that are used to preserve subscriber equipment.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises the steps: when carrying out

Recover the context of described subscriber equipment according to the user context information that obtains.

The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.

More than bearer context restoration methods, network element and system after a kind of subscriber equipment implicit detach provided by the present invention are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.

Claims

1. the method for recovery of context after the subscriber equipment implicit detach is characterized in that, comprising:

The mobile management network element of second network receives the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of the described subscriber equipment that obtains at least one network except that second network, obtain the address of the mobile management network element of first network in described at least one network; Described subscriber equipment uses idle pulley saving signaling or two registration;

2. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1 is characterized in that, recovers further to comprise behind the context of described subscriber equipment:

The mobile management network element of second network uses the advisory of idle pulley saving signaling or two registrations to give subscriber equipment subscriber equipment.

3. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1 is characterized in that, recovers further to comprise behind the context of described subscriber equipment:

The mobile management network element of second network uses the advisory of idle pulley saving signaling to give gateway subscriber equipment.

4. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1 is characterized in that, the identification information of described subscriber equipment at least one network except that second network comprises following at least a:

Described at least one network except that second network is the temporary mark of user equipment allocation;

The positional information of described subscriber equipment at least one network except that second network.

5. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 4, it is characterized in that, when described second network or at least one network except that second network were the GERAN/UTRAN network, this network was that the described temporary mark of user equipment allocation is packet TMSI P-TMSI; When described second network or at least one network except that second network were the E-UTRAN network, this network was that the described temporary mark of user equipment allocation is global unique temporary identity GUTI;

When described second network or at least one network except that second network were the GERAN/UTRAN network, the positional information of described subscriber equipment in this network was RAI; When described second network or at least one network except that second network were the E-UTRAN network, the positional information of described subscriber equipment in this network was TAI.

6. as the method for recovery of context after each described subscriber equipment implicit detach of claim 1 to 5, it is characterized in that, further comprise:

Carry indication information in the message that described subscriber equipment sends, described indication information is used for bearer context or packet data protocol PDP Context are notified in the update mode information of network the mobile management network element of second network.

7. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 6 is characterized in that, the bearer context of described subscriber equipment or the PDP Context update mode information in network comprises:

Bearer context in the mobile management network element of second network or PDP Context are up-to-date; Bearer context or PDP Context in the mobile management network element in the perhaps described a certain network except that second network are up-to-date.

8. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 7 is characterized in that, described subscriber equipment determines whether bearer context or the PDP Context information in the mobile management network element of certain network is that up-to-date mode comprises:

Subscriber equipment finds that the P-TMSI in the contextual information is masked as and do not upgrade and need the idle pulley saving signaling synchronous, determines that then bearer context or the PDP Context information in the mobile management network element of E-UTRAN network is up-to-date;

Subscriber equipment finds that the GUTI in the contextual information is masked as and do not upgrade and need the idle pulley saving signaling synchronous, determines that then bearer context or the PDP Context information in the mobile management network element of GERAN/UTRAN network is up-to-date; Perhaps,

Subscriber equipment finds that bearer update is masked as in the context: E-UTRAN, and then bearer context or the PDP Context information in the mobile management network element of definite E-UTRAN network is up-to-date; Subscriber equipment finds that bearer update is masked as in the context: GERAN/UTRAN, and then bearer context or the PDP Context information in the mobile management network element of definite GERAN/UTRAN network is up-to-date; Perhaps,

Subscriber equipment finds that E-UTRAN bearer update indicating bit is in the context: correct (True) or be 1, perhaps, subscriber equipment finds that GERAN/UTRAN bearer update indicating bit is in the context: (False) of mistake or be 0, determine that then bearer context or the PDP Context information in the mobile management network element of E-UTRAN network is up-to-date; Subscriber equipment finds that GERAN/UTRAN bearer update indicating bit is in the context: correct (True) or be 1, perhaps, subscriber equipment finds that E-UTRAN bearer update indicating bit is in the context: (False) of mistake or be 0, determine that then bearer context or the PDP Context information in the mobile management network element of GERAN/UTRAN network is up-to-date.

9. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 6 is characterized in that, described indication information is specially:

P-TMSI sign and updating type are provided with P-TMSI and are masked as and upgrade and updating type is idle pulley saving signaling ISR, are up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network; GUTI sign and updating type are provided with GUTI and are masked as and upgrade and updating type is that ISR is synchronous, are up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; Perhaps,

Bearer update flag information, this information setting are that E-UTRAN is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network; This information setting is that GERAN/UTRAN is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; Perhaps,

GERAN/UTRAN bearer update indicating bit, this indicating bit is set to: correct (True) or be 1 is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; Perhaps, E-UTRAN bearer update indicating bit, this indicating bit is set to: correct (True) or be 1 is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network; Perhaps,

E-UTRAN bearer update indicating bit, this indicating bit is set to: (False) of mistake or be 0 is up-to-date with bearer context or PDP Context information in the mobile management network element of expression GERAN/UTRAN network; Perhaps, GERAN/UTRAN bearer update indicating bit, this indicating bit is set to: (False) of mistake or be 0 is up-to-date with bearer context or PDP Context information in the mobile management network element of expression E-UTRAN network.

10. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 6, it is characterized in that, further comprise: when the bearer context in the mobile management network element of determining certain network in the message that the mobile management network element of described second network sends according to subscriber equipment or PDP Context when not being up-to-date, from gateway, obtain the bearer context or the PDP Context information of described subscriber equipment, recover bearer context or the PDP Context of subscriber equipment in second network according to described bearer context or PDP Context information.

11. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 6, it is characterized in that, further comprise: when the bearer context in the mobile management network element of determining certain network in the message that the mobile management network element of described second network sends according to subscriber equipment or PDP Context when not being up-to-date, the mobile management network element of described second network indicates the mobile management network element of described network only to obtain described mobility of user equipment managing context.

12. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 6, it is characterized in that, further comprise: when the bearer context in the mobile management network element of determining certain network in the message that the mobile management network element of described second network sends according to subscriber equipment or PDP Context when not being up-to-date, the mobile management network element of described second network only recovers described mobility of user equipment managing context obtain the context of described subscriber equipment from the mobile management network element of described network after.

13. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1, it is characterized in that, when described network except that second network during at least two, the mobile management network element of described second network preferentially obtains the contextual information of subscriber equipment from the similar network of access style.

14. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1, it is characterized in that, when the mobile management network element of described second network was SGSN in the GERAN/UTRAN network, the message that described subscriber equipment sends was: the Routing Area Update request message;

When the mobile management network element of described second network was MME in the E-UTRAN network, the request message that described subscriber equipment sends was the tracing section updating request message.

15. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1, it is characterized in that, the mobile management network element of described second network receives the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of the described subscriber equipment that obtains at least one network except that second network, the address that obtains the mobile management network element of first network in described at least one network specifically comprises:

The mobile management network element of described second network receives Routing Area Update request message or tracing section updating request message or the service request information that subscriber equipment sends, and the mobile management network element of second network that the mobile management network element of described second network carries according to described subscriber equipment is the context that the temporary mark of described user equipment allocation is inquired about described subscriber equipment;

If the mobile management network element of described second network does not inquire the context of described subscriber equipment, the mobile management network element of then described second network sends Routing Area Update Reject message or tracing section updating refuse information or service-denial message to described subscriber equipment, carries cause value " Implicitly detached " in the message;

If described subscriber equipment finds to use ISR mechanism or two login mechanisms after receiving described Routing Area Update Reject message that the mobile management network element of described second network sends or tracing section updating refuse information or service-denial message, then described subscriber equipment transmission Routing Area Update request message or tracing section updating request message carry the identification information of described subscriber equipment at first network to the mobile management network element of described second network in the message;

The mobile management network element of described second network obtains the mobile management network element address of described first network according to the identification information of described subscriber equipment in first network.

16. the method for recovery of context after the subscriber equipment implicit detach as claimed in claim 1, it is characterized in that, the mobile management network element of described second network receives the message that subscriber equipment sends, when knowing the subscriber equipment implicit detach according to described message, according to the identification information of the described subscriber equipment that obtains at least one network except that second network, the address that obtains the mobile management network element of first network in described at least one network specifically comprises:

The mobile management network element of described second network receives Routing Area Update request message or tracing section updating request message or the service request information that subscriber equipment sends, and carries the positional information of described subscriber equipment in temporary mark, first network and second network of first network and the use of second network in the described request message;

The mobile management network element of second network that the mobile management network element of described second network carries according to described subscriber equipment is the context that the temporary mark of described user equipment allocation is inquired about described subscriber equipment, if the mobile management network element of second network does not inquire the context of described subscriber equipment, whether carry the identification information of described subscriber equipment in first network in the Routing Area Update request message that the judgement of the mobile management network element of then described second network is received or tracing section updating request message or the service request information;

If carry the information of described subscriber equipment in first network in described Routing Area Update request message or tracing section updating request message or the service request information, the mobile management network element of then described second network obtains the mobile management network element address of described first network according to the identification information of described subscriber equipment in first network.

17. a mobile management network element is characterized in that, comprising: message sink unit, User Status function-judging unit, user totem information acquiring unit, address acquisition unit, context acquiring unit, context recovery unit, wherein:

The user totem information acquiring unit, be used to obtain when described User Status function-judging unit judgement learns that described user is in the implicit detach state and uses idle pulley saving signaling or two registration, obtain the identification information in first network outside second network of described subscriber equipment under this mobility management unit;

Address acquisition unit is used for the described subscriber equipment that obtains according to the user totem information acquiring unit identification information at described first network, obtains the address of the mobile management network element in described first network;

The context acquiring unit is used for the address of the mobile management network element that obtains according to address acquisition unit, obtains the contextual information of described subscriber equipment from described mobile management network element;

18. mobile management network element as claimed in claim 17, it is characterized in that, further comprise: information notification unit is used for after recovering the context of described subscriber equipment described subscriber equipment being used the advisory subscriber equipment of idle pulley saving signaling or two registrations; And/or described subscriber equipment is used the advisory gateway of idle pulley saving signaling.

19. mobile management network element as claimed in claim 18 is characterized in that, further comprises: the bearer context acquiring unit is used for obtaining from gateway the bearer context or the PDP Context of subscriber equipment.

20. a network system is characterized in that, comprises, and the mobile management network element of subscriber equipment, first network and the mobile management network element of second network, wherein:

The mobile management network element of first network is used to preserve the contextual information of described subscriber equipment.

21. network system as claimed in claim 20 is characterized in that, also comprises the mobile management network element of the 3rd network, is used to preserve the contextual information of described subscriber equipment;

When the mobile management network element of described second network can't obtain described user's contextual information when the mobile management network element from first network, obtain the address of the mobile management network element of described the 3rd network; Obtain the contextual information of described subscriber equipment according to described address, and recover the context of subscriber equipment according to described contextual information.

22. as claim 20 or 21 described network systems, it is characterized in that, also comprise gateway, described subscriber equipment, be used for also determining whether bearer context or PDP Context in the mobile management network element of certain network are up-to-date, and in the message that sends message to the mobile management network element of described second network, carry indication information, whether the bearer context or the PDP Context that are used in reference in the mobile management network element that is shown in this network are up-to-date;