CN101540989A

CN101540989A - Method, device and system for recovering data after restarting of device

Info

Publication number: CN101540989A
Application number: CN200810084512A
Authority: CN
Inventors: 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-03-21
Filing date: 2008-03-21
Publication date: 2009-09-23
Anticipated expiration: 2028-03-21
Also published as: CN101540989B

Abstract

The embodiment of the invention discloses a method, a device and a system for recovering data after restarting of a device. The method of the embodiment of the invention comprises the following steps: detecting the restarting of a first network mobility management network element, determining user equipment (UE) related with the first network mobility management network element, sending information which is carried with context information of the UE to the first network mobility management network element by a second mobility management network element, and recovering the context of the UE by the first network mobility management network element according to the acquired context information. Because the context of the UE in the device is recovered after the device is restarted, SGSN can receive a position updating request of the UE when the subsequent UE initiates position updating flow, and avoids the UE initiating attachment flow again; therefore, idle signaling can be reduced, and idle signaling load can be reduced.

Description

Data reconstruction method after equipment is restarted, equipment and system

Technical field

The present invention relates to communication technical field, the data reconstruction method after the equipment of relating in particular to is restarted, equipment and system.

Background technology

Existing GPRS/universal mobile telecommunications system (GPRS/UMTS, GeneralPacket Radio Service/Universal Mobile Telecommunications System) in the system, packet-switched domain (PS, Packet Switched Domain) comprises service universal grouping wireless business supporting node (SGSN, Serving GPRS Supporting Node) and ggsn (GGSN, Gateway GPRS Supporting Node) etc.Wherein, the SGSN Core Feature is to realize functions such as routing forwarding, mobile management, session management and user profile storage.GGSN is mainly used in external network and carries out interface, also is used to realize the transmission of user face data simultaneously.

In the prior art, after the SGSN fault was restarted, all contextual informations of the last UE of this SGSN were all deleted, and in addition, GGSN can delete all PDP Contexts relevant with this SGSN.

In research and practice process to prior art, the inventor finds in the prior art, because SGSN is with the context deletion of UE, like this when the UE occurrence positions position that more SGSN will refuse UE during new technological process new technological process more, when for example UE sends the Routing Area Update request message to SGSN, SGSN can send the position and upgrade refuse information to UE, thereby causes the more new technological process failure of UE position.And UE can resend Attach Request message to SGSN after receiving position renewal refuse information, can cause space interface signaling to roll up like this, increases the signaling traffic load of eating dishes without rice or wine greatly.

In addition, because GGSN is with all PDP Context deletions of UE, UE needs initiation again to set up the context of UE, can cause the original Internet protocol (IP that uses of UE, International Protocol) address changes, the original business of using of UE can not continue to use, and the business that UE uses will be interrupted, thereby can influence user's experience.

Summary of the invention

Data reconstruction method, equipment and system after the embodiment of the invention provides equipment to restart, the signaling traffic load of eating dishes without rice or wine after can minimizing equipment restarting.

Data reconstruction method after equipment provided by the present invention is restarted, equipment and system embodiment are achieved through the following technical solutions:

An aspect of the embodiment of the invention provides the data reconstruction method after a kind of equipment is restarted, and this method comprises:

Detecting the first network mobility managed network element restarts, determine and the relevant user equipment (UE) of the first network mobility managed network element, second mobile management network element sends message to the first network mobility managed network element, carries the contextual information of described UE in the described message;

The first network mobility managed network element recovers the context of described UE according to the contextual information that obtains.

The embodiment of the invention a kind of mobile management network element is provided on the other hand, this mobile management network element comprises: detecting unit, UE determining unit, message sending unit, wherein:

Whether detecting unit is used for detecting other mobile management network elements of network and restarts, and when restarting, triggers the UE determining unit;

The UE determining unit is used for determining the UE relevant with restarting mobile management network element;

Message sending unit is used for sending message to the mobile management network element of restarting, and carries the contextual information of the determined UE of described UE determining unit in the described message.

The embodiment of the invention another kind of mobile management network element is provided on the other hand, this mobile management network element comprises: message sink unit, contextual information acquiring unit, the context recovery unit, wherein:

The message sink unit is used for after this mobile management network element is restarted, and receives the message that SGW sends, and carries the identification information of UE in the described message;

The contextual information acquiring unit, be used for when described message sink unit receives the message of SGW transmission, determine another network mobility managed network element relevant, and from this mobile management network element, obtain the contextual information of the relevant UE of this mobile management network element with described UE;

The context recovery unit is used for the context according to the contextual information recovery of the obtaining UE relevant with this mobile management network element.

The embodiment of the invention another kind of mobile management network element is provided on the other hand, this mobile management network element comprises: message sink unit, UE determining unit, message sending unit, wherein:

The message sink unit is used to receive message, carries the identification information of the UE relevant with the mobile management network element of restarting in the network in the described message;

The UE determining unit is used for determining the UE of the identification information correspondence of described UE;

The embodiment of the invention another kind of mobile management network element also is provided on the other hand, this mobile management network element comprises: message sink unit, context recovery unit, wherein:

The message sink unit is used for when restarting, and receives the message that other mobile management network elements send in the network, carries the contextual information of simultaneously relevant with described other mobile management network elements with this mobile management network element UE in the message;

The context recovery unit is used for recovering the context of described UE according to the contextual information that receives.

The another aspect of the embodiment of the invention provides a kind of communication system, and this communication system comprises: the first network mobility managed network element, the second network mobility managed network element, wherein:

The second network mobility managed network element, be used for when detecting the first network mobility managed network element and restart, determine and the relevant UE of the first network mobility managed network element, and send message, carry the contextual information of described UE in the described message to the first network mobility managed network element;

The first network mobility managed network element is used for recovering the context of described UE according to the contextual information that receives.

The another aspect of the embodiment of the invention provides another kind of communication system, and this communication system comprises: SGW, the first network mobility managed network element, the second network mobility managed network element, wherein:

SGW, be used for when detecting the first network mobility managed network element and restart, determine and the relevant UE of the first network mobility managed network element, and send message informing first network mobility managed network element recovery context, carry first identification information of described UE in the described message;

The first network mobility managed network element, be used for according to message from SGW, determine the second network mobility managed network element relevant and send the contextual information that message is obtained described UE, carry second identification information of described UE in the described message to the second network mobility managed network element with described UE; And recover the context of described UE according to the contextual information that receives;

The second network mobility managed network element is used for inquiring about according to second identification information of described UE the contextual information of described UE, and sends to the first network mobility managed network element.

The another aspect of the embodiment of the invention also provides another kind of communication system, and this communication system comprises: SGW, the first network mobility managed network element, the second network mobility managed network element, wherein:

SGW, be used for when detecting the first network mobility managed network element and restart, determine and the relevant UE of the described first network mobility managed network element, send the message informing second network mobility managed network element and recover the context of described UE in the first network mobility managed network element, carry the identification information of described UE in the described message;

The second network mobility managed network element is used to receive the message from SGW, and according to the identification information of the UE in the described message, inquires about the contextual information of described UE, and send to the first definite network mobility managed network element;

The first network mobility managed network element is used for recovering according to the contextual information of the described UE that receives the context of described UE.

From technique scheme as can be seen, after the first network mobility managed network element is restarted, can determine and the relevant UE of the first network mobility managed network element, and obtain the contextual information of described UE from the second network mobility managed network element relevant with described UE, recover the context of described UE according to the contextual information that obtains, thereby be implemented in the described first network mobility managed network element and restart the context that UE is wherein recovered in the back, owing to after equipment is restarted, recovered the context of the UE in this equipment, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

Description of drawings

Fig. 1 is a gradual network system configuration diagram in the embodiment of the invention;

Fig. 2 is the data reconstruction method embodiment one signaling process figure after equipment is restarted in the embodiment of the invention;

Fig. 3 is the data reconstruction method embodiment two signaling process figure after equipment is restarted in the embodiment of the invention;

Fig. 4 is the data reconstruction method embodiment three signaling process figure after equipment is restarted in the embodiment of the invention;

Fig. 5 is the data reconstruction method embodiment four signaling process figure after equipment is restarted in the embodiment of the invention;

Fig. 6 is the data reconstruction method embodiment five signaling process figure after equipment is restarted in the embodiment of the invention;

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

Fig. 8 is mobile management network element embodiment two structural representations in the embodiment of the invention;

Fig. 9 is mobile management network element embodiment three structural representations in the embodiment of the invention;

Figure 10 is mobile management network element embodiment four structural representations in the embodiment of the invention;

Figure 11 is communication system embodiment one structural representation in the embodiment of the invention;

Figure 12 is communication system embodiment two structural representations in the embodiment of the invention;

Figure 13 is communication system embodiment three structural representations in the embodiment of the invention.

Embodiment

The embodiment of the invention provides data reconstruction method, equipment and the system after equipment is restarted, when the first network mobility managed network element is restarted, the second network mobility managed network element is determined and the relevant UE of the described first network mobility managed network element, and the contextual information of described UE is sent to the first network mobility managed network element by message; The first network mobility managed network element recovers the context of described UE according to described contextual information.Carry out after context recovers,, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine when follow-up UE initiates the position updating request that the position more will be accepted UE during new technological process.

Be understandable that the described first network mobility managed network element only is used to distinguish different mobile management network elements with the second network mobility managed network element, does not represent certain sequence.And, when the first network mobility managed network element is SGSN among the GERAN/UTRAN, the described second network mobility managed network element can be the SGSN among the GERAN/UTRAN, also can be the MME among the universal mobile telecommunications system land radio access web E-UTRAN of evolution; When the first network mobility managed network element was MME among the E-UTRAN, the second network mobility managed network element can be the SGSN among the GERAN/UTRAN, also can be the MME among the E-UTRAN.

The embodiment of the invention both had been applicable in the network of 3G and 3G, also be applicable to 3G network afterwards, following with reference to Fig. 1, the evolution network framework of introducing in the embodiment of the invention to be suitable for, this network comprises: the universal mobile telecommunications system land radio access web (E-UTRAN of evolution, Evolved UMTS TerrestrialRadio 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.; Gateway (SGW, 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 (PDN GW, Packet Data NetworkGateway) 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 Data Network); In the present patent application file, the functional equivalent of the user's face anchor point GGSN before PDN GW function and version 7 reach between the 3GPP network of version.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-3GPP 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.

For recovering the context of UE in the described first network mobility managed network element better, UE can use idle pulley saving signaling (ISR, Idle mode Signaling Reduction) mechanism or two login mechanisms, below briefly introduces:

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 flow process 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, SGW 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 flow process 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 between SGSN or MME and the HSS, and simultaneously two login mechanisms do not need SGW to handle yet, and SGW 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, following with reference to accompanying drawing, context after restarting by the first network mobility managed network element fault recovers to be specifically described, be understandable that the embodiment of the invention is applicable to that also the equipment that other reasons causes restarts.

Scheme one: when the second network mobility managed network element detects the first network mobility managed network element fault and restarts, determine and the relevant UE of the first network mobility managed network element, and this UE is defined as and the relevant UE of the first network mobility managed network element, send message to the first network mobility managed network element then, carry the contextual information of described UE in the described message; And recover the context of described UE according to the contextual information that receives by the first network mobility managed network element.By the following examples one and embodiment two describe:

With reference to Fig. 2, be the one signaling process figure of the data reconstruction method embodiment after equipment is restarted in the embodiment of the invention, below be elaborated by concrete steps:

201, SGW detects the first network mobility managed network element fault and restarts;

The first network mobility managed network element can be different equipment according to different access networks, for example, can be the SGSN in the GERAN/UTRAN access network, also can be the MME in the E-UTRAN access network.

SGW detects the first network mobility managed network element method whether fault is restarted can adopt conventional detection, specifically can detect the SGSN method whether fault is restarted according to GGSN in 3GPP TS 23.007 agreements and detect, and is not described in detail.

202, SGW determines and the relevant UE of this first network mobility managed network element, judge whether these UE use ISR mechanism, if UE does not use ISR mechanism, then send deleting bearing request message or agent binding update messages to PDN GW, all resources that notice PDN GW deletes this UE, and execution in step 203; Use ISR mechanism if find UE, then do not notify PDN GW to discharge the resource of this UE, keep SGW and go up the resource of the UE relevant and bearer context or the PDP Context of UE with the second network mobility managed network element, and the ISR state of UE is set to deactivation status, and SGW also can delete and the relevant resource of the first network mobility managed network element simultaneously;

The resource concrete form of the UE that preserves among the PDN GW has multiple, for example: bearer context resource or PDP Context resource that UE uses, the resources such as IP address that perhaps banding cache list item (Binding Cache Entry) resource, and UE is used.

SGW determines that whether the UE relevant with the first network mobility managed network element can by existing the first network mobility managed network element that fault restarts in the context of inquiring about these UE address or other identify realization.

Wherein, the deleting bearing request message is the form of message that interface protocol between SGW and the PDN GW adopts when using GPRS Tunnel Protocol (GTP, GPRS Tunneling Protocol); Agent binding update messages is that the interface protocol between SGW and the PDN GW adopts the form of message that adopts when acting on behalf of mobile IP (PMIP, Proxy Mobile International Protocol).Be understandable that, can also adopt other message to notify PDN GW deletion user resources according to the difference of interface protocol.

Be understandable that, when UE does not use ISR mechanism, the resource that SGW also can not notify PDN GW to discharge this UE, SGW does not need to delete the resource of this UE yet.

And the resource relevant with the first network mobility managed network element comprises the IP address of the first network mobility managed network element, Tunnel End Point Identifier resources such as (TEID, Tunnel Endpoint Identifier).

If all resources that SGW notice PDN GW deletes this UE in 203 steps 202, then PDNGW deletes all resources of this UE, returns deleting bearing response or proxy binding acknowledgment messages to SGW, and SGW is with all resource deletions of this UE;

204, the second network mobility managed network element detects the first network mobility managed network element fault and restarts;

Detect the first network mobility managed network element whether the method for fault can adopt the GGSN in 3GPP TS 23.007 agreements to check the method that the SGSN fault is restarted, be not described in detail.

205, the second network mobility managed network element is determined and the relevant UE of the first network mobility managed network element, and judges whether these UE use ISR mechanism, if UE does not use ISR mechanism, then the second network mobility managed network element is not done special processing; If UE uses ISR mechanism, then the second network mobility managed network element notifies the first network mobility managed network element to recover the context of UE, send the download context request message to the first network mobility managed network element, the contextual information of UE is notified to the first network mobility managed network element;

The second network mobility managed network element can be inquired about the context of UE, if there is the address of the first network mobility managed network element in the context, illustrates that then this UE is relevant with the first network mobility managed network element.

Be understandable that, when described UE uses ISR mechanism, the title that the download context request message that the second network mobility managed network element is sent is only adopted for convenience of description, this patent file does not limit the title of message.

The second network mobility managed network element is in this step with the mobile management (MM of UE, MobilityManagement) contextual information is passed to the first network mobility managed network element, if exist in the second network mobility managed network element bearer context information of UE or PDP Context information or, then the second network mobility managed network element can send to the first network mobility managed network element with bearer context information or the PDP Context information of this UE of existing.

Comprise temporary mark and positional information that UE uses in the MM contextual information of UE in the first network mobility managed network element.And, if first network is the GERAN/UTRAN access network, then temporary mark is a packet TMSI symbol (P-TMSI, Packet Temporary MobileSubscriber Identifier), positional information is Routing Area Identifier (RAI, Routing Area Identity); If first network is the E-UTRAN access network, then temporary mark is global unique temporary identity (GUTI, Globally Unique Temporary Identity), and positional information is tracking area identification (TAI, TrackingArea Identity).

206, the first network mobility managed network element recovers the context of UE according to the contextual information received, and returns the download context response message to the second network mobility managed network element;

The first network mobility managed network element can also recover the bearer context of UE according to the bearer context information of receiving according to the MM context of the MM contextual information recovery UE that receives, perhaps recovers the PDP Context of UE according to the PDP Context information of receiving.

The ISR operating position of first network mobility managed network element decision UE in the download context response message that returns to the second network mobility managed network element, can be carried the ISR operating position of UE, promptly whether uses ISR mechanism.

If the first network mobility managed network element notifies the second network mobility managed network element UE not use ISR mechanism, then the information (such as the address of the first network mobility managed network element, temporary mark and the positional information that UE uses in the first network mobility managed network element) that the second network mobility managed network element is relevant with the first network mobility managed network element in the UE context is deleted, and the ISR state of UE is changed to deactivation status.

207, the first network mobility managed network element sends and upgrades bearing request message to SGW, the ISR operating position of UE is notified to SGW, and the relevant information (as the address information of the first network mobility managed network element, TEID information etc.) with oneself is notified to SGW simultaneously;

208, SGW returns and upgrades bearing response message to the first network mobility managed network element.

Be understandable that step 201～203 and step 204～208 there is no sequencing, when the SGW and the second network mobility managed network element detect the first network mobility managed network element fault, will carry out the corresponding subsequent flow process respectively.

As seen, when the second network mobility managed network element detects the first network mobility managed network element fault and restarts, determine and the relevant UE of the first network mobility managed network element, send the message of the MM contextual information that carries this UE to the first network mobility managed network element, the first network mobility managed network element can recover the MM context of this UE according to the MM contextual information that receives, because when the first network mobility managed network element fault is restarted, recover the MM context of described UE, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

In addition, when the first network mobility managed network element fault is restarted, recover the PDP Context of described UE according to the PDP Context information of second network mobility managed network element transmission, perhaps the bearer context information that sends according to the second network mobility managed network element is recovered the bearer context of described UE, and, SGW does not notify PDN GW to discharge the resource of this UE, the resource that can keep UE on the PDN GW, UE does not need to rebulid PDP Context or the bearer context of UE, after the context on the first network mobility managed network element recovers, the IP address that UE uses can not change, therefore, the original business of using of UE can also continue to use, thereby can improve user experience.

With reference to Fig. 3, be the two signaling process figure of the data reconstruction method embodiment after equipment is restarted in the embodiment of the invention, be with a last embodiment difference, the first network mobility managed network element can also be according to the bearer context that recovers UE from the bearer context information of SGW, perhaps according to the PDP Context that recovers UE from the PDP Context information of SGW, below be elaborated by concrete steps:

301, SGW detects the first network mobility managed network element fault and restarts;

SGW detects the first network mobility managed network element method whether fault is restarted and can realize by conventional detection, specifically can detect the SGSN method whether fault is restarted according to the GGSN in 3GPP TS 23.007 agreements and detect, and is not described in detail.

302, SGW determines and the relevant UE of this first network mobility managed network element, judge whether these UE use ISR mechanism, if UE does not use ISR mechanism, then send deleting bearing request message or agent binding update messages to PDN GW, notice PDN GW deletes all resources of this UE (as the bearer context resource or the banding cache list item resource of UE use, and execution in step 303 resources such as IP address that UE uses); Use ISR mechanism if find UE, then do not notify PDN GW to discharge the resource of this UE, keep resource relevant and bearer context or the PDP Context of UE with the second network mobility managed network element, and the ISR state of UE is set to deactivation status, and SGW can delete and the relevant resource of the first network mobility managed network element simultaneously;

SGW determines and the relevant UE of the first network mobility managed network element, and the address of the first network mobility managed network element that the fault that exists in can the context by inquiry UE is restarted or other identify realization.

The deleting bearing request message is the form of message that the interface protocol between SGW and the PDN GW adopts when using the GTP agreement, and the form of message that agent binding update messages adopts when to be interface protocol between SGW and the PDN GW use the PMIP agreement.

If all resources that SGW notice PDN GW deletes this UE in 303 steps 302, then PDNGW deletes all resources of this UE, returns deleting bearing response or proxy binding acknowledgment messages to SGW, and SGW is with all resource deletions of this UE;

If 304 SGW find UE and use ISR mechanism, then SGW does not notify PDN GW to delete the resource of this UE, and bearer context information or PDP Context information that UE uses issued the first network mobility managed network element, send and download bearer context request message to the first network mobility managed network element;

Be understandable that described download bearer context request message only for the convenient form of message that is adopted of describing, does not limit concrete message name.

305, the first network mobility managed network element returns and downloads the bearer context response message to SGW;

306, the second network mobility managed network element detects the first network mobility managed network element fault and restarts;

It is identical to detect the method that method that whether fault is restarted and GGSN in 3GPP TS 23.007 agreements check that the SGSN fault restarts.

307, the second network mobility managed network element is determined and the relevant UE of the first network mobility managed network element, judges whether these UE use ISR mechanism, if UE does not use ISR mechanism, then the second network mobility managed network element is not done special processing; If UE uses ISR mechanism, then the second network mobility managed network element notifies the first network mobility managed network element to recover the context of UE, send the download context request message to the first network mobility managed network element, the contextual information of UE is notified to the first network mobility managed network element;

The second network mobility managed network element can be issued the first network mobility managed network element with MM contextual information, bearer context information or the PDP Context information of UE, also can only the MM contextual information of UE be issued the first network mobility managed network element.Comprise temporary mark and positional information that UE uses in the MM contextual information of UE in the first network mobility managed network element.If first network is the GERAN/UTRAN access network, then temporary mark is P-TMSI, and positional information is RAI; If first network is the E-UTRAN access network, then temporary mark is GUTI, and positional information is TAI.

The second network mobility managed network element determines that the UE relevant with the first network mobility managed network element can realize by the address or other identification informations that whether have the first network mobility managed network element in the context of inquiring about these UE.

308, the first network mobility managed network element recovers the context of UE according to the contextual information of receiving, and returns the download context response message and give the second network mobility managed network element;

The first network mobility managed network element recovers the MM context of UE according to the MM contextual information of receiving from the second network mobility managed network element, bearer context or PDP Context according to bearer context information of from SGW, receiving or PDP Context information recovery UE, be bearer context information or bearer context information or the PDP Context information of PDP Context information priority in the second network mobility managed network element among the SGW, this is because the bearer context information or the PDP Context information of preserving among the common SGW are up-to-date.

Because the ISR operating position of first network mobility managed network element decision UE, therefore whether the ISR operating position of carrying UE in the download context response message that returns promptly uses ISR.If the first network mobility managed network element notifies the second network mobility managed network element UE not use ISR mechanism, the second network mobility managed network element information deletion that the first network mobility managed network element in the UE context is relevant then, for example, the address of the first network mobility managed network element, temporary mark and the positional information that UE uses in the first network mobility managed network element are deleted, and the ISR state of UE is changed to deactivation status.

309, the first network mobility managed network element send to upgrade bearing request message to SGW, and the ISR operating position of UE is notified to SGW, simultaneously with own relevant information as the address information of the first network mobility managed network element, TEID information untill further notice to SGW;

310, SGW returns and upgrades bearing response message to the first network mobility managed network element.

Preferential bearer context or the PDP Context that recovers UE from bearer context information or the PDP Context information of SGW that adopt of the first network mobility managed network element can guarantee that the bearer context or the PDP Context that are recovered are the bearer context or the PDP Context of the up-to-date use of UE before the first network mobility managed network element fault is restarted.

Scheme two: SGW detects the first network mobility managed network element fault when restarting, determine and the relevant UE of the first network mobility managed network element, send the message informing first network mobility managed network element and recover context, carry first identification information of this UE in the described message; The first network mobility managed network element is according to the message from SGW, determine the second network mobility managed network element relevant and send the contextual information that message is obtained this UE, carry second identification information of this UE in the described message to the second network mobility managed network element with this UE; Be defined as the relevant UE of the first network mobility managed network element by the second network mobility managed network element according to the pairing UE of second identification information of this UE then, and the contextual information of this UE is sent to the first network mobility managed network element; The first network mobility managed network element can recover the context of this UE according to the contextual information that receives.Below describe by a specific embodiment:

With reference to Fig. 4, be the three signaling process figure of the data reconstruction method embodiment after equipment is restarted in the embodiment of the invention, below be elaborated by concrete steps:

401, SGW detects the first network mobility managed network element fault and restarts;

Detecting GGSN in the first network mobility managed network element method whether fault is restarted and 3GPP TS 23.007 agreements, to detect the SGSN method whether fault is restarted identical, is not described in detail.

402, SGW determines and the relevant UE of this first network mobility managed network element, judge whether these UE use ISR mechanism, if UE does not use ISR mechanism, then send deleting bearing request message or agent binding update messages to PDN GW, all resources and execution in step 403 that notice PDN GW deletes this UE; Use ISR mechanism if find UE, then do not notify PDN GW to discharge the resource of this UE, keep SGW and go up resource relevant and bearer context or the PDP Context of UE with the second network mobility managed network element, and the ISR state of UE is set to deactivation status, and SGW can delete and the relevant resource of the first network mobility managed network element simultaneously;

UE resource form on the PDN GW has multiple, for example, and bearer context resource or banding cache list item (Binding Cache Entry) resource that UE uses, the resources such as IP address that UE uses.

If all resources that SGW notice PDN GW deletes this UE in 403 steps 402, then PDNGW deletes all resources of this UE, returns deleting bearing response or proxy binding acknowledgment messages to SGW, and SGW is with all resource deletions of this UE then;

If 404 SGW find UE and use ISR mechanism that then SGW does not notify PDN GW to delete the resource of this UE; And notify the first network mobility managed network element to recover the context of UE, send context recovery request message to the first network mobility managed network element, carry first identification information of this UE and the identification information of the second network mobility managed network element in the described message;

Wherein, first identification information of UE can represent with IMSI, the also temporary mark that can in the first network mobility managed network element, use with this UE, and perhaps temporary mark and positional information are represented; The identification information of the second network mobility managed network element can be represented with the address information of the second network mobility managed network element, the also positional information that can use in the second network mobility managed network element with this UE, perhaps temporary mark and the positional information of using in the second network mobility managed network element with this UE represented.For example: SGW can notify the first network mobility managed network element to recover the context of UE by following several method:

1) SGW carries the address information of the IMSI and the second network mobility managed network element of UE in message;

2) SGW carries the positional information that UE uses in the second network mobility managed network element in message, perhaps first identification information of temporary sign and positional information and UE;

Wherein, if second network is the GERAN/UTRAN access network, then temporary mark is P-TMSI, and positional information is RAI; If second network is the E-UTRAN access network, then temporary mark is GUTI, and positional information is TAI.

First identification information of UE is the IMSI of UE or temporary mark and the positional information of using in the first network mobility managed network element for UE.

Wherein, if first network is the GERAN/UTRAN access network, then the temporary mark that uses of UE is P-TMSI, and positional information is RAI; If first network is the E-UTRAN access network, then the temporary mark that uses of UE is GUTI, and positional information is TAI.

3) SGW carries IMSI and the address information of the second network mobility managed network element and bearer context information or the PDP Context information that UE uses of UE in message;

4) SGW carries the positional information that UE uses in the second network mobility managed network element in message, perhaps temporary sign and the positional information in the second network mobility managed network element, used of UE, bearer context information or PDP Context information that first identification information of UE and UE use.

First identification information of UE is the IMSI of UE or the temporary mark that uses in the first network mobility managed network element for UE, perhaps temporary mark and the positional information used in the first network mobility managed network element of UE.

405, after the first network mobility managed network element is received the message of above-mentioned SGW transmission, according to the identification information of the second network mobility managed network element wherein, send message and obtain the contextual information of UE, carry second identification information of this UE in the described message to the second network mobility managed network element of correspondence;

Second identification information of UE can be IMSI, the also temporary mark that can use in the second network mobility managed network element for UE, perhaps temporary mark and the positional information used in the second network mobility managed network element of this UE.For example, the first network mobility managed network element can have following several processing method:

1) the first network mobility managed network element sends context request message to the second network mobility managed network element, carries the temporary mark that UE uses in the second network mobility managed network element in the message;

2) first network mobility managed network element transmission context request message or other message are carried the IMSI of UE to the second network mobility managed network element in the message.

In addition, if SGW issues the first network mobility managed network element with bearer context information or PDP Context information that UE uses in the step 404, then the management of first network mobility can be indicated the second network mobility managed network element only need obtain the MM contextual information of UE use and do not needed bearer context information or PDP Context information.Following several processing mode can be arranged:

(1) first network mobility managed network element sends the MM contextual information that MM Context request (MM ContextRequest) message is given the second network mobility managed network element acquisition request UE;

(2) first network mobility managed network elements send context request (Context Request) message and give the second network mobility managed network element, and newly-increased flag bit information indicates the second network mobility managed network element only to obtain the MM contextual information of UE in the message.

For example, the information of flag bit can followingly be handled: the first network mobility managed network element is newly-increased MM Context recovering mark (MM Context Retrieval flag) cell in ContextRequest message, indicates the second network mobility managed network element only to obtain the MM contextual information of UE; Perhaps the first network mobility managed network element newly-increased reason (Cause) cell and Cause in Context Request message is set to the MM contextual information that " MM Context recovers (MM Context Retrieval) " indication second network mobility managed network element obtains UE.

In the notification message that step 404SGW sends, also can not carry the identification information of the second network mobility managed network element relevant with described UE, when the first network mobility managed network element receives SGW when recovering contextual notification message, by searching the identification information of the local second network mobility managed network element of preserving relevant, determine the second corresponding network mobility managed network element with this UE.

406, the second network mobility managed network element is received after the above-mentioned message according to the context of second identification information inquiry UE of UE, and the UE contextual information that inquires is sent to the first network mobility managed network element;

If the first network mobility managed network element indicates the second network mobility managed network element only need obtain the MM contextual information of UE in step 405, then the second network mobility managed network element is only passed to the first network mobility managed network element with the MM contextual information of UE; Otherwise the second network mobility managed network element is passed to the first network mobility managed network element with the MM context of UE and bearer context information or PDP Context information.

407, the first network mobility managed network element returns context acknowledgement message then and gives the second network mobility managed network element according to the context of the contextual information recovery UE that receives from the second network mobility managed network element;

Wherein, the first network mobility managed network element can recover the MM context of UE according to the MM contextual information of receiving.Can also recover the bearer context of UE according to the bearer context information of receiving, perhaps recover the PDP Context of UE according to the PDP Context information of receiving.If the first network mobility managed network element is received from the bearer context information of UE among the SGW or PDP Context information, then the first network mobility managed network element recovers the bearer context of UE according to the bearer context information among the SGW, perhaps according to the PDP Context that recovers UE from the PDP Context information among the SGW, otherwise the first network mobility managed network element recovers the bearer context of UE according to the bearer context information of receiving from the second network mobility managed network element, perhaps recover the PDP Context of UE, i.e. bearer context information among the SGW or PDP Context information priority bearer context information or the PDP Context information in the second network mobility managed network element according to the PDP Context information of obtaining from the second network mobility managed network element.

The ISR operating position of first network mobility managed network element decision UE, whether the ISR operating position of carrying UE in the context acknowledgement message of being returned promptly uses ISR mechanism.If the first network mobility managed network element notifies the second network mobility managed network element UE not use ISR mechanism, the second network mobility managed network element information deletion that the first network mobility managed network element in the UE context is relevant then, and the ISR state of UE is changed to deactivation status.

The information that the first network mobility managed network element is relevant comprises the address of the first network mobility managed network element, the temporary mark that UE uses in the first network mobility managed network element, perhaps the temporary mark that uses in the first network mobility managed network element of UE and positional information etc.

408, the first network mobility managed network element returns context recovery response message and gives SGW;

409, the first network mobility managed network element send to upgrade bearing request message to SGW, and the ISR operating position of UE is notified to SGW, and the information (as the address information of the first network mobility managed network element, TEID information etc.) with oneself is notified to SGW simultaneously;

410, SGW returns and upgrades bearing response message to the first network mobility managed network element.

As seen, when SGW detects the first network mobility managed network element fault and restarts, notify the first network mobility managed network element to recover the MM context of UE, and obtain the MM contextual information from the second network mobility managed network element relevant with this UE by the first network mobility managed network element, and recover the MM context of this UE according to the MM contextual information that is obtained, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

In addition, when the first network mobility managed network element fault is restarted, after the SGW or the second network mobility managed network element send to the first network mobility managed network element with bearer context information or PDP Context information, the first network mobility managed network element can recover the bearer context of described UE according to the bearer context information of obtaining, perhaps recover the PDP Context of described UE according to the PDP Context information of obtaining, and do not notify PDN GW to discharge the resource of this UE, the resource that can keep UE on the PDN GW, therefore, UE does not need to rebulid PDP Context or the bearer context of UE, after the context on the first network mobility managed network element recovers, the IP address that UE uses can not change, therefore, the original business of using of UE can also continue to use, thereby can improve user experience.

Below introduce another kind of technical scheme of the present invention:

Scheme three: SGW detects the first network mobility managed network element fault when restarting, determine and the relevant UE of the first network mobility managed network element, and send the message informing second network mobility managed network element relevant with this UE and recover the context of this UE in the first network mobility managed network element, carry the identification information of this UE in the described message; The second network mobility managed network element receives the message from SGW, and according to the identification information of the UE in this message, the UE that determines this identification information correspondence is and the relevant UE of the first network mobility managed network element, and the contextual information of this UE is sent to the first network mobility managed network element; The first network mobility managed network element recovers the context of this UE according to the contextual information of the UE that receives.Below describe by a specific embodiment:

With reference to Fig. 5, be the four signaling process figure of the data reconstruction method embodiment after equipment is restarted in the embodiment of the invention, below be elaborated by concrete steps:

501, SGW detects the first network mobility managed network element fault and restarts;

502, SGW determines and the relevant UE of this first network mobility managed network element, judge whether these UE use ISR mechanism, if UE does not use ISR mechanism, then send deleting bearing request message or agent binding update messages to PDN GW, all resources that notice PDN GW deletes this UE, and execution in step 503; Use ISR mechanism if find UE, then do not notify PDN GW to discharge the resource of this UE, keep resource relevant and bearer context or the PDP Context of UE with the second network mobility managed network element, and the ISR state of UE is set to deactivation status, and SGW can delete and the relevant resource of the first network mobility managed network element simultaneously;

UE resource among the PDN GW can be bearer context resource or banding cache list item (the Binding Cache Entry) resource that UE uses, and the resources such as IP address of UE use.

If all resources that SGW notice PDN GW deletes this UE in 503 steps 402, then PDNGW deletes all resources of this UE, returns deleting bearing response or proxy binding acknowledgment messages to SGW, and SGW is with all resource deletions of this UE then;

If 504 SGW find UE and use ISR mechanism that then SGW can send and download bearer context request message to the first network mobility managed network element, and bearer context information or the PDP Context information of UE are issued the first network mobility managed network element;

505, the first network mobility managed network element returns then and downloads the bearer context response message to SGW according to bearer context or the PDP Context of bearer context information of receiving from SGW or PDP Context information recovery UE;

506, SGW notifies the second network mobility managed network element to recover the context of UE in the first network mobility managed network element, send context recovery request message to the second network mobility managed network element, carry the identification information of this UE and the identification information of the first network mobility managed network element in the described message;

The identification information of UE can be the IMSI of UE, also can be the temporary mark of UE in the second network mobility managed network element, perhaps temporary mark and the positional information used in the second network mobility managed network element of UE; The identification information of the first network mobility managed network element can be the address information of the first network mobility managed network element, also can be the positional information of UE in the first network mobility managed network element, perhaps temporary mark and the positional information in the first network mobility managed network element, used of UE, for example:

1) SGW carries the address information of the IMSI and the first network mobility managed network element of UE in message;

2) SGW carries the identification information of UE in message, the positional information that UE uses in the first network mobility managed network element, perhaps temporary sign and the positional information used in the first network mobility managed network element of UE;

The sign of UE can be the IMSI of UE or the temporary mark that uses for UE in the second network mobility managed network element, perhaps temporary mark and the positional information used in the second network mobility managed network element of UE.

3) SGW carries IMSI and the address information of the first network mobility managed network element and bearer context information or the PDP Context information that UE uses of UE in message;

4) SGW carries the positional information that UE uses in the first network mobility managed network element in message, perhaps bearer context information or the PDP Context information used of temporary sign and the positional information used in the first network mobility managed network element of UE and the identification information that carries UE and UE.

Also can not carry the identification information of the first network mobility managed network element in the notification message that SGW sends, when the second network mobility managed network element receives SGW context recovery request message, restart by detecting the first network mobility managed network element fault, determine the first corresponding network mobility managed network element.

If SGW sends bearer context or the PDP Context that UE uses to first network mobility managed network element, then SGW can indicate the second network mobility managed network element only need recover the MM context of UE in the first network mobility managed network element.For example, can realize by following several modes:

1) SGW sends MM context recovery request message to the MM context of second network mobility managed network element request recovery UE in the first network mobility managed network element;

2) SGW sends context recovery request message to the second network mobility managed network element, and the second network mobility managed network element request of indicating of newly-increased flag bit information recovers the MM context of UE in the first network mobility managed network element in the message.

The information of flag bit can followingly be handled: SGW is newly-increased MM Context recovering mark (MM Context Retrieval flag) cell in context recovery request message, indicates the second network mobility managed network element only to recover the MM context of UE in the first network mobility managed network element; Perhaps SGW newly-increased Cause cell and Cause in context recovery request message is set to " MM Context recovers (MM Context Retrieval) " indication second network mobility managed network element and only recovers the MM context of UE in the first network mobility managed network element.

507, the second network mobility managed network element is received after the message that above-mentioned SGW sends according to the contextual information of the identification information inquiry UE of UE, and the UE contextual information that inquires is issued the first network mobility managed network element;

The second network mobility managed network element can have following processing method:

1) the second network mobility managed network element sends the download context request message to the first network mobility managed network element, carries the MM contextual information of UE in the message, and the bearer context information of UE or PDP Context information;

Wherein comprise the information of UE in the first network mobility managed network element in the MM context of UE, wherein can comprise temporary mark and positional information that UE uses in the first network mobility managed network element.

2) the second network mobility managed network element sends the download context request message to the first network mobility managed network element, carries the MM contextual information of UE in the message.

Wherein comprise the information of UE in the first network mobility managed network element in the MM context of UE, wherein comprise the temporary mark that UE uses in the first network mobility managed network element, perhaps temporary mark and the positional information in the first network mobility managed network element, used of UE.

Comprise bearer context information or PDP Context information if SGW issues in the message of the second network mobility managed network element, then the second network mobility managed network element is bearer context information or the PDP Context information that SGW transmits with UE bearer context information in the own network element or PDP Context information updating.

508, the first network mobility managed network element recovers the context of UE according to the contextual information of receiving, and returns the download context response message and give the second network mobility managed network element;

The first network mobility managed network element recovers the MM context of UE according to the MM contextual information of receiving from the second network mobility managed network element.

The first network mobility managed network element can also be according to bearer context or the PDP Context of bearer context information of receiving or PDP Context information recovery UE.If the first network mobility managed network element is received the bearer context information of UE or PDP Context information and is not received UE bearer context information or the PDP Context information that SGW sends that then the first network mobility managed network element recovers bearer context or the PDP Context of UE according to bearer context information in the second network mobility managed network element or PDP Context information from the second network mobility managed network element; If the first network mobility managed network element is received bearer context information or the PDP Context information of UE from SGW, then the first network mobility managed network element is according to bearer context or the PDP Context of bearer context information among the SGW or PDP Context information recovery UE, i.e. bearer context information among the SGW or PDP Context information priority bearer context information or the PDP Context information in the second network mobility managed network element.

The ISR operating position of first network mobility managed network element decision UE is returned the download context response message then and is given the second network mobility managed network element, and whether the ISR operating position of carrying UE in the message promptly uses ISR.If the first network mobility managed network element notifies the second network mobility managed network element UE not use ISR mechanism, the second network mobility managed network element information deletion that the first network mobility managed network element in the UE context is relevant then is changed to deactivation status with the ISR state of UE.

Information relevant with the first network mobility managed network element in the UE context comprises: temporary mark and positional information that the address of the first network mobility managed network element, UE use in the first network mobility managed network element.

509, the second network mobility managed network element returns context recovery response message and gives SGW;

510, the first network mobility managed network element send to upgrade bearing request message to SGW, and the ISR operating position of UE is notified to SGW, and the information with oneself is notified to SGW simultaneously;

The information that the first network mobility managed network element is relevant comprises: the address information of the first network mobility managed network element, TEID information etc.

511, SGW returns and upgrades bearing response message to the first network mobility managed network element.

As seen, when SGW detects the first network mobility managed network element fault and restarts, notify the second network mobility managed network element to recover MM context in the first network mobility managed network element, recover the MM context of this UE according to the MM contextual information that obtains from the second network mobility managed network element by the first network mobility managed network element, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

In addition, when the first network mobility managed network element fault is restarted, the first network mobility managed network element recovers the PDP Context of described UE according to the PDP Context information of obtaining, perhaps recover the bearer context of UE according to the bearer context information of obtaining, and do not notify PDN GW to discharge the resource of this UE, the resource that can keep UE on the PDN GW, therefore, UE does not need to rebulid the context of UE, after the context on the first network mobility managed network element recovered, the IP address that UE uses can not change, therefore, the original business of using of UE can also continue to use, thereby can improve user experience.

Be understandable that, when the first network mobility managed network element fault is restarted, SGW can notify the resource of the PDN GW deletion UE relevant with the first network mobility managed network element, and after the context of this UE on the first network mobility managed network element recovers, first network mobility managed network element notice SGW and grouped data network gateway are created bearer context or the PDP Context of this UE, and what use in bearer context of being created or the PDP Context is the IP address that this UE used before equipment is restarted, and below describes by a specific embodiment:

With reference to Fig. 6, be the five signaling process figure of the data reconstruction method embodiment after equipment is restarted in the embodiment of the invention, below be elaborated by concrete steps:

601, SGW detects the first network mobility managed network element fault and restarts;

602, SGW determines and the relevant UE of this first network mobility managed network element, sends deleting bearing request message or agent binding update messages to PDN GW, all resources that notice PDN GW deletes this UE;

Wherein, the deleting bearing request message is the form of message that interface protocol between SGW and the PDN GW adopts when using GTP; Agent binding update messages is the form of message that the interface protocol between SGW and the PDN GW adopts when adopting PMIP.Be understandable that, can also adopt other message to notify PDN GW deletion user resources according to the difference of interface protocol.

603, PDN GW deletes all resources of this UE, returns deleting bearing response or proxy binding acknowledgment messages to SGW, and SGW is with all resource deletions of this UE;

604, the second network mobility managed network element detects the first network mobility managed network element fault and restarts;

605, the second network mobility managed network element is determined and the relevant UE of the first network mobility managed network element, and judges whether these UE use ISR mechanism, if UE does not use ISR mechanism, then the second network mobility managed network element is not done special processing; If UE uses ISR mechanism, then the second network mobility managed network element notifies the first network mobility managed network element to recover the MM context of UE, send the download context request message to the first network mobility managed network element, the MM contextual information of UE is notified to the first network mobility managed network element;

The second network mobility managed network element can be inquired about the MM context of UE, if there is the address of the first network mobility managed network element in the MM context, illustrates that then this UE is relevant with the first network mobility managed network element.

The second network mobility managed network element is passed to the first network mobility managed network element with the MM contextual information of UE in this step, if have bearer context information or the PDP Context information of UE in the second network mobility managed network element, then the second network mobility managed network element can send to the first network mobility managed network element with all contextual informations of this UE of existing.

Comprise temporary mark and positional information that UE uses in the MM contextual information of UE in the first network mobility managed network element.And if first network is the GERAN/UTRAN access network, then temporary mark is P-TMSI, and positional information is RAI; If first network is the E-UTRAN access network, then temporary mark is GUTI, and positional information is TAI.Comprise the IP address information of UE in bearer context or the PDP Context information at the UE of this bearer context or the use of this PDP Context.

606, the first network mobility managed network element recovers the context of UE according to the contextual information received, and returns the download context response message to the second network mobility managed network element;

The first network mobility managed network element recovers the MM context of UE according to the MM contextual information of receiving.Can also recover the bearer context of UE according to the bearer context information of receiving, perhaps recover the PDP Context of UE according to the PDP Context information of receiving.

607, for the bearer context or the PDP Context of each recovery, the first network mobility managed network element sends creates bearing request message to SGW, carries the IP address information of the UE of this bearer context or this PDP Context use in the message;

608, SGW transmission establishment bearing request message or agent binding update messages are to PDN GW, notice PDN GW creates bearer context or the PDP Context of UE, the IP address information of carrying the UE of bearer context or PDP Context or banding cache list item use in the message.

Wherein, creating bearing request message is the form of message that interface protocol between SGW and the PDN GW adopts when using GTP; Agent binding update messages is the form of message that the interface protocol between SGW and the PDN GW adopts when adopting PMIP.Be understandable that, can also adopt other message to notify PDN GW to create PDP Context or bearer context according to the difference of interface protocol.

PDN GW receives in the above-mentioned message bearer context or PDP Context or the banding cache list item of creating UE, and the bearer context of creating or PDP Context or banding cache list item use the UE IP address of carrying in the above-mentioned message.

609, PDN GW returns and creates carrying response or proxy binding acknowledgment messages to SGW;

610, SGW returns and creates bearing response message to the first network mobility managed network element.

As seen, when the second network mobility managed network element detects the first network mobility managed network element fault and restarts, determine and the relevant UE of the first network mobility managed network element, send the message of the MM contextual information carry this UE to the first network mobility managed network element, the first network mobility managed network element can recover the MM context of this UE according to the MM contextual information that receives.Follow-up like this UE initiates more new technological process of the position that more the first network mobility managed network element will be accepted UE during new technological process, position, thereby reduces the signaling traffic load of eating dishes without rice or wine.

In addition, bearer context or PDP Context for each recovery, first mobile management network element notice SGW and PDN GW create corresponding bearer context or PDP Context, carry the IP address information of the UE of bearer context or PDP Context use in the message.Like this when the first network mobility managed network element fault is restarted, new bearer context of creating or the IP address of this UE in the PDP Context do not change among the PDN GW, the previously used business of UE also can continue to use, and service disconnection can not take place, and therefore can increase user experience.

Be understandable that step 601～603 and step 604～609 there is no sequencing, when the SGW and the second network mobility managed network element detect the first network mobility managed network element fault, will carry out the corresponding subsequent flow process respectively.

Above-mentioned behind the bearer context or PDP Context of first network mobility managed network element recovery UE, first mobile management network element notice SGW and PDN GW create corresponding bearer context or PDP Context, the method of carrying the IP address information of the UE that bearer context or PDP Context use in the message is applicable to that also SGW triggers the second network mobility managed network element and sends the contextual situation that contextual information recovers UE in the first network mobility managed network element to the first network mobility managed network element, be applicable to that also SGW triggers the first network mobility managed network element and obtains the contextual information of UE from the second network mobility managed network element relevant with this UE, recover the contextual situation of UE in the first network mobility managed network element.Illustrate no longer one by one.

Be understandable that, more than each embodiment be applicable to that also UE uses two login mechanisms etc. can satisfy UE and at least two situations that network element is relevant, as, the information such as context of a UE are when a plurality of network elements such as different network mobility managed network element are preserved, the fault of UE place network mobility managed network element is restarted, the specific implementation flow process uses ISR mechanism identical with UE, repeats no more.

More than method for recovery of context after the equipment fault that the embodiment of the invention adopted restarted be described in detail, for those skilled in the art being understood better and realize the present invention, below equipment related in the embodiment of the invention and system are carried out corresponding description:

With reference to Fig. 7, be mobile management network element embodiment one structural representation in the embodiment of the invention, this mobile management network element comprises: detecting unit 701, UE determining unit 702, message sending unit 703, wherein:

Whether detecting unit 701 is used for detecting other mobile management network elements of network and restarts, and when restarting, triggers UE determining unit 702;

UE determining unit 702 is used for determining the UE relevant with restarting mobile management network element;

Message sending unit 703 is used for sending message to the mobile management network element of restarting, and carries the contextual information of described UE determining unit 702 determined UE in the described message.

Wherein, contextual information is specifically as follows: MM contextual information, MM contextual information and bearer context information, MM contextual information and PDP Context information.

As seen, when described mobile management network element detects that other mobile management network elements are restarted in the network, determine the UE relevant with restarting mobile management network element, send the message of the MM contextual information carry this UE to the first network mobility managed network element, the first network mobility managed network element can recover the MM context of this UE according to the MM contextual information that receives.Follow-up like this UE initiates more new technological process of the position that more the first network mobility managed network element will be accepted UE during new technological process, position, thereby reduces the signaling traffic load of eating dishes without rice or wine.

And after above-mentioned mobile management network element sends to described mobile management network element of restarting with bearer context information or PDP Context information, described mobile management network element of restarting can recover bearer context or the PDP Context of described UE, and, when described mobile management network element is restarted, PDN GW keeps the resource of described UE, the IP address of the UE that uses in bearer context or the PDP Context before perhaps adopting described mobile management network element to restart by PDN GW, create corresponding bearer context or PDP Context, like this when mobile management network element is restarted, new bearer context of creating or the IP address of this UE in the PDP Context do not change among the PDN GW, the previously used business of UE also can continue to use, service disconnection can not take place, therefore can increase user experience.

With reference to Fig. 8, be mobile management network element embodiment two structural representations in the embodiment of the invention, this mobile management network element comprises: message sink unit 801, contextual information acquiring unit 802, context recovery unit 803, wherein:

Message sink unit 801 is used for after this mobile management network element is restarted, and receives the message that SGW sends, and carries the identification information of UE in the described message;

Contextual information acquiring unit 802, be used for when described message sink unit 801 receives the message of SGW transmission, determine another network mobility managed network element relevant, and from this mobile management network element, obtain the contextual information of the relevant UE of this mobile management network element with described UE;

Context recovery unit 803 is used for the context according to the contextual information recovery of the obtaining UE relevant with this mobile management network element.

Wherein, contextual information is specifically as follows: the MM contextual information, and MM contextual information and bearer context information, MM contextual information and PDP Context information, context recovery unit 803 can recover the MM context of UE according to the MM contextual information that obtains; Recover the bearer context of UE according to the bearer context information of obtaining; Perhaps recover the PDP Context of UE according to the PDP Context information of obtaining.

As seen, when the message that SGW sends is restarted and received to this mobile management network element, obtain the MM contextual information of this UE from another mobile management network element relevant with UE, and recover the MM context of the UE relevant according to the MM contextual information that obtains with this mobile management network element, thereby follow-up UE initiates the position and more restarts more new technological process of position that mobile management network element will accept UE during new technological process, thereby reduces the signaling traffic load of eating dishes without rice or wine.

Above-mentioned mobile management network element is by recovering bearing context or PDP Context, and when described mobile management network element is restarted, PDN GW keeps the resource of the described UE relevant with the mobile management network element of restarting, the IP address of the UE that uses in bearer context or the PDP Context before perhaps adopting described mobile management network element to restart by PDN GW, create corresponding bearer context or PDP Context, like this when described mobile management network element is restarted, new bearer context of creating or the IP address of this UE in the PDP Context do not change among the PDN GW, the previously used business of UE also can continue to use, service disconnection can not take place, therefore can increase user experience.

With reference to Fig. 9, be mobile management network element embodiment three structural representations in the embodiment of the invention, this mobile management network element comprises: message sink unit 901, UE determining unit 902, message sending unit 903, wherein:

Message sink unit 901 is used to receive message, carries the identification information of the UE relevant with the mobile management network element of restarting in the network in the described message;

UE determining unit 902 is used for determining the UE of the identification information correspondence of described UE;

Message sending unit 903 is used for sending message to the mobile management network element of restarting, and carries the contextual information of described UE determining unit 902 determined UE in the described message.

Wherein, the contextual information of UE can be MM contextual information, MM contextual information and bearer context information, MM contextual information and PDP Context information.

As seen, this mobile management network element is determined the pairing UE of described identification information according to the identification information of the UE that receives, and in the mobile management network element of restarting that the MM contextual information of described UE is sent, make the mobile management network element of restarting to recover the MM context of described UE, after the MM context recovers, follow-up UE initiates the position more restarts more new technological process of position that mobile management network element will accept UE during new technological process, thereby reduces the signaling traffic load of eating dishes without rice or wine.

And carry bearer context information or the PDP Context information of the determined UE of described UE determining unit in the message that message sending unit 903 sends, make the mobile management network element of restarting to recover bearer context or the PDP Context of described UE, and keep the resource of described UE before described mobile management network element is restarted by PDN GW, perhaps restarting after mobile management network element recovers the bearer context or PDP Context of described UE, adopt institute's mobile management network element to restart the IP address of employed UE in preceding bearer context or the PDP Context by PDN GW, like this, new bearer context of creating or the IP address of this UE in the PDP Context do not change among the PDN GW, the previously used business of UE also can continue to use, service disconnection can not take place, therefore can increase user experience.

With reference to Figure 10, be mobile management network element embodiment four structural representations in the embodiment of the invention, this mobile management network element comprises: message sink unit 1001, context recovery unit 1002, wherein:

Message sink unit 1001 is used for when restarting, and receives the message that other mobile management network elements send in the network, carries the contextual information of simultaneously relevant with described other mobile management network elements with this mobile management network element UE in the message;

Context recovery unit 1002 is used for recovering the context of described UE according to the contextual information that receives.

Wherein, the contextual information of UE can be MM contextual information, MM contextual information and bearer context information, MM contextual information and PDP Context information.And context recovery unit 1002 can recover the MM context of UE according to the MM contextual information that obtains; Recover the bearer context of UE according to the bearer context information of obtaining; Perhaps recover the PDP Context of UE according to the PDP Context information of obtaining.

As seen, describedly restart mobile management network element by obtaining the MM contextual information of UE, recover the context of UE, make follow-up UE initiate the position and more restart more new technological process of position that mobile management network element will accept UE during new technological process, thereby reduce the signaling traffic load of eating dishes without rice or wine.

And described mobile management network element passes through to recover PDP Context or bearer context when restarting, simultaneously keep the resource of described UE before described mobile management network element is restarted by PDN GW, perhaps restarting after mobile management network element recovers the bearer context or PDP Context of described UE, adopt institute's mobile management network element to restart the IP address of employed UE in preceding bearer context or the PDP Context by PDNGW, like this, new bearer context of creating or the IP address of this UE in the PDP Context do not change among the PDN GW, the previously used business of UE also can continue to use, service disconnection can not take place, therefore can increase user experience.

For those skilled in the art being understood better and realize the embodiment of the invention, below communication system related in the embodiment of the invention carried out correspondence describe:

With reference to Figure 11, be communication system embodiment one structural representation in the embodiment of the invention, this communication system comprises: the first network mobility managed network element 1101, the second network mobility managed network element 1102, wherein:

The second network mobility managed network element 1102, be used for when detecting the first network mobility managed network element 1101 and restart, determine the UE relevant with the first network mobility managed network element 1101, and, carry the contextual information of described UE in the described message to the first network mobility managed network element, 1101 transmission message;

The first network mobility managed network element 1101 is used for recovering the context of described UE according to the contextual information that receives.

Wherein, the contextual information of UE can be MM contextual information, MM contextual information and bearer context information, MM contextual information and PDP Context information.And the first network mobility managed network element 1101 can recover the MM context of UE according to the MM contextual information that obtains; Recover the bearer context of UE according to the bearer context information of obtaining; Perhaps recover the PDP Context of UE according to the PDP Context information of obtaining.

As seen, when the second network mobility managed network element 1102 detects the first network mobility managed network element 1101 and restarts, determine the UE relevant with the first network mobility managed network element 1101, send the message of the MM contextual information that carries this UE to the first network mobility managed network element 1101, the first network mobility managed network element 1101 can recover the MM context of this UE according to the MM contextual information that receives, because when the first network mobility managed network element 1101 is restarted, recover the MM context of described UE, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

In this communication system, can also comprise SGW, when being used to detect the first network mobility managed network element 1101 and restarting, determine the UE relevant, and bearer context information or the PDP Context information of described UE is sent to the first network mobility managed network element 1101 with the first network mobility managed network element 1101; The described first network mobility managed network element 1101 can recover the bearer context of UE according to the bearer context information of obtaining from the second network mobility managed network element 1102 or SGW, recovers the PDP Context of described UE according to the PDP Context information of obtaining from the second network mobility managed network element 1102 or SGW.

The first network mobility managed network element 1101 in this communication system can be according to bearer context information or the PDP Context information of the second network mobility managed network element 1102 or SGW, when recovering the bearer context of described UE or PDP Context, this communication system also can comprise PDN GW, be used for when the first network mobility managed network element is restarted, keeping the resource of described UE.

The first network mobility managed network element 1101 in this communication system can be according to bearer context information or the PDP Context information of the second network mobility managed network element 1102 or SGW, when recovering the bearer context of described UE or PDP Context, this communication system also can comprise PDN GW

The described first network mobility managed network element 1101, also be used for behind the bearer context or PDP Context that recover described UE, send bearer context or PDP Context that message informing PDN GW creates described UE, carry the IP address that described UE uses in the described message before the first network mobility managed network element 1101 is restarted;

The IP address of the UE that provides according to the first network mobility managed network element 1101 is provided described PDN GW, creates bearer context or the PDP Context of described UE.

As seen, in above-mentioned communication system, when the first network mobility managed network element is restarted, recover the PDP Context of described UE according to the PDP Context information of the second network mobility managed network element or SGW transmission, perhaps recover the bearer context of described UE according to the bearer context information of the second network mobility managed network element or SGW transmission, and, the resource that keeps UE on the PDN GW, perhaps, after PDP Context on the first network mobility managed network element or bearer context recovery, the IP address that utilizes the UE that uses in PDP Context or the bearer context before the first network mobility managed network element is restarted, to use, UE does not need to rebulid PDP Context or the bearer context of UE; The IP address that UE uses can not change, and therefore, the original business of using of UE can also continue to use, thereby can improve user experience.

With reference to Figure 12, be communication system embodiment two structural representations in the embodiment of the invention, this communication system comprises: SGW1201, the first network mobility managed network element 1202, the second network mobility managed network element 1203, wherein:

SGW1201, be used for when detecting the first network mobility managed network element 1202 and restart, determine the UE relevant with the first network mobility managed network element 1202, and send the message informing first network mobility managed network element 1202 recovery MM contexts, carry first identification information of described UE in the described message;

The first network mobility managed network element 1202, according to message from SGW1201, determine the second network mobility managed network element 1203 relevant and send the contextual information that message is obtained described UE, carry second identification information of described UE in the described message to the second network mobility managed network element 1203 with described UE; And recover the context of described UE according to the contextual information that receives;

The second network mobility managed network element 1203 is inquired about the contextual information of described UE according to second identification information of described UE, and sends to the first network mobility managed network element 1202.

Wherein, the first network mobility managed network element 1202 can recover the MM context of described UE according to the MM contextual information that obtains from the second network mobility managed network element 1203.Can also recover the bearer context of described UE according to the bearer context information of obtaining from the second network mobility managed network element 1203; Perhaps recover the PDP Context of described UE according to the PDP Context information of obtaining from the second network mobility managed network element 1203.

As seen, in this communication system, when SGW1201 detects the first network mobility managed network element 1202 and restarts, notify the first network mobility managed network element to recover the MM context, and obtain the MM contextual information from the second network mobility managed network element relevant with this UE by the first network mobility managed network element, and recover the MM context of this UE according to the MM contextual information that is obtained, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

Can do further to optimize to above-mentioned communication system, for example, described SGW1201 also carries bearer context information or the PDP Context information of described UE in the message that the first network mobility managed network element 1202 sends; The described first network mobility managed network element 1202 also is used for recovering according to the bearer context information that receives the bearer context of described UE; Perhaps recover the PDP Context of described UE according to the PDP Context information that receives.

The first network mobility managed network element 1202 in this communication system can be according to bearer context information or the PDP Context information of the second network mobility managed network element 1203 or SGW, when recovering the bearer context of described UE or PDP Context, this communication system also can comprise PDN GW, be used for when the first network mobility managed network element is restarted, keeping the resource of described UE.

The first network mobility managed network element 1202 in this communication system can be according to bearer context information or the PDP Context information of the second network mobility managed network element 1203 or SGW, when recovering the bearer context of described UE or PDP Context, this communication system also can comprise PDN GW, the described first network mobility managed network element 1202, after also being used in the bearer context or PDP Context that recovers described UE, send bearer context or PDP Context that message informing PDN GW creates described UE, carry the IP address that described UE uses in the described message before the first network mobility managed network element 1202 is restarted;

The IP address of the UE that provides according to the first network mobility managed network element 1202 is provided described PDN GW, creates bearer context or the PDP Context of described UE.

As seen, when the first network mobility managed network element 1202 is restarted, after the SGW1201 or the second network mobility managed network element 1203 send to the first network mobility managed network element with bearer context information or PDP Context information, the first network mobility managed network element can recover the bearer context of described UE according to the bearer context information of obtaining, perhaps recover the PDP Context of described UE according to the PDP Context information of obtaining, and the resource that keeps UE on the PDN GW, perhaps after the first network mobility managed network element 1202 recovers the bearer context or PDP Context of described UE, the IP address of the UE that uses in PDP Context before PDN GW adopts the first network mobility managed network element 1202 to restart or the bearer context is created PDP Context or the bearer context of UE again, therefore, UE does not need to rebulid PDP Context or the bearer context of UE, after the context on the first network mobility managed network element recovers, the IP address that UE uses can not change, the original business of using of UE can also continue to use, thereby can improve user experience.

With reference to Figure 13, be communication system embodiment three structural representations in the embodiment of the invention, this communication system comprises: SGW1301, the first network mobility managed network element 1302, the second network mobility managed network element 1303, wherein:

SGW1301, when detecting the first network mobility managed network element 1302 and restart, determine and the relevant UE of the described first network mobility managed network element 1302, send the message informing second network mobility managed network element 1303 and recover the context of described UE in the first network mobility managed network element 1302, carry the identification information of described UE in the described message;

The second network mobility managed network element 1303 receives the message from SGW1301, and according to the identification information of the UE in the described message, inquires about the contextual information of described UE, and send to the first definite network mobility managed network element 1302;

The first network mobility managed network element 1302 recovers the context of described UE according to the contextual information of the described UE that receives.

Wherein, described contextual information can be the MM contextual information, MM contextual information and bearer context information, perhaps MM contextual information and PDP Context information.The first network mobility managed network element 1202 can recover the MM context of described UE according to the MM contextual information that obtains from the second network mobility managed network element 1203.Can also recover the bearer context of described UE according to the bearer context information of obtaining from the second network mobility managed network element 1203; Perhaps recover the PDP Context of described UE according to the PDP Context information of obtaining from the second network mobility managed network element 1203.

As seen, when SGW1301 detects the first network mobility managed network element 1302 and restarts, the MM context of notifying the second network mobility managed network element 1303 to recover in the first network mobility managed network element 1302, recover the MM context of this UE according to the MM contextual information that obtains from the second network mobility managed network element 1303 by the first network mobility managed network element 1302, follow-up like this UE initiate the position more during new technological process SGSN will accept the position updating request of UE, avoid UE to initiate attachment flow again, therefore can reduce space interface signaling, reduce the signaling traffic load of eating dishes without rice or wine.

For above-mentioned communication system, a kind of extended mode can be that described SGW1301 goes back bearer context information or the PDP Context information that portability has described UE in the message that the first network mobility managed network element 1302 sends; The described first network mobility managed network element 1302 also can be used for recovering according to the bearer context information that receives the bearer context of described UE; Perhaps recover the PDP Context of described UE according to the PDP Context information that receives.

According to the bearer context information recovering bearing context that receives, when perhaps recovering PDP Context information, also can do further expansion for the first network mobility managed network element to communication system according to the PDP Context information that receives, for example:

Described communication system also can comprise PDN GW, is used for keeping the resource of described UE when the first network mobility managed network element is restarted.

Another kind of extended mode is, described communication system also can comprise PDN GW, the described first network mobility managed network element 1302, also be used for behind the bearer context or PDP Context that recover described UE, send bearer context or PDP Context that message informing PDN GW creates described UE, carry the IP address that described UE uses in the described message before the first network mobility managed network element is restarted;

The IP address of the UE that provides according to the first network mobility managed network element 1302 is provided described PDN GW, creates bearer context or the PDP Context of described UE.

As seen, in the described communication system, when the first network mobility managed network element is restarted, the first network mobility managed network element recovers the PDP Context of described UE according to the PDP Context information of obtaining, perhaps recover the bearer context of UE according to the bearer context information of obtaining, and the resource that keeps UE on the PDN GW, the IP address of the UE that in PDP Context or bearer context, uses before perhaps utilizing the first network mobility managed network element to restart, restart PDP Context or the bearer context of setting up UE, make UE not need to rebulid the context of UE, and, after the context on the first network mobility managed network element recovered, the IP address that UE uses can not change, therefore, the original business of using of UE can also continue to use, thereby can improve user experience.

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

Detecting the first network mobility managed network element restarts, determine and the relevant UE of the first network mobility managed network element, the second network mobility managed network element sends message to the first network mobility managed network element, carries the contextual information of described UE in the described message;

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

More than data reconstruction method, equipment and system after equipment provided by the present invention restarted be 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 data reconstruction method after a kind of equipment is restarted is characterized in that, comprising:

2, the data reconstruction method after equipment as claimed in claim 1 is restarted is characterized in that, the described first network mobility managed network element that detects is restarted, and determines to be specially with the relevant UE of the first network mobility managed network element:

The second network mobility managed network element detects the first network mobility managed network element and restarts, the second network mobility managed network element is inquired about and the relevant UE of the first network mobility managed network element, and the UE that inquires is defined as and the relevant UE of the first network mobility managed network element.

3, the data reconstruction method after equipment as claimed in claim 1 is restarted is characterized in that, detects the first network mobility managed network element and restarts, and determines to be specially with the relevant UE of the first network mobility managed network element:

Gateway SGW detects the first network mobility managed network element restarts, and SGW determines and the relevant UE of the first network mobility managed network element, and the transmission message informing first network mobility managed network element, carries first identification information of described UE in the described message;

The first network mobility managed network element is according to the message from SGW, determine the second network mobility managed network element relevant and send the contextual information that message is obtained described UE, carry second identification information of described UE in the described message to the second network mobility managed network element with described UE;

The second network mobility managed network element is defined as the relevant UE of the first network mobility managed network element with the pairing UE of second identification information of described UE.

4, the data reconstruction method after equipment as claimed in claim 3 is restarted is characterized in that, the described first network mobility managed network element determines that the relevant method of the second network mobility managed network element relevant with described UE is specially:

When also carrying the identification information of the second network mobility managed network element relevant with described UE in described SGW sends to the message of the first network mobility managed network element, the described first network mobility managed network element determines to send the second network mobility managed network element of message according to the identification information of the described second network mobility managed network element; Perhaps,

When the described first network mobility managed network element receives from the message of SGW, search the identification information of second mobile management network element relevant of preservation, determine the second corresponding network mobility managed network element with described UE.

5, the data reconstruction method after equipment as claimed in claim 4 is restarted, it is characterized in that, the identification information of the described second network mobility managed network element is specially: the address information of the second network mobility managed network element, the positional information that perhaps described UE uses in the second network mobility managed network element, temporary mark and positional information that perhaps described UE uses in the second network mobility managed network element.

6, the data reconstruction method after equipment as claimed in claim 1 is restarted is characterized in that, detects the first network mobility managed network element and restarts, and determines to be specially with the relevant UE of the first network mobility managed network element:

SGW detects the first network mobility managed network element and restarts, SGW determines and the relevant UE of the first network mobility managed network element, and send the message informing second network mobility managed network element relevant with described UE and recover the context of described UE in the first network mobility managed network element, carry the identification information of described UE in the described message;

The second network mobility managed network element receives the message from SGW, and the pairing UE of identification information that determines described UE is the relevant UE of the first network mobility managed network element.

7, the data reconstruction method after equipment as claimed in claim 6 is restarted, it is characterized in that, when being sent the message informing second network mobility managed network element by SGW and recover the context of described UE in the first network mobility managed network element, described method also comprises:

The second network mobility managed network element is at the first network mobility managed network element of determining to send message before the first network mobility managed network element sends message.

8, the data reconstruction method after equipment as claimed in claim 7 is restarted is characterized in that, the definite method that will send the first network mobility managed network element of message of the described second network mobility managed network element is specially:

When also carrying the identification information of the first network mobility managed network element relevant with described UE in SGW sends to the message of the second network mobility managed network element, the described second network mobility managed network element determines to send the first network mobility managed network element of message according to the identification information of the described first network mobility managed network element; Perhaps,

When the described second network mobility managed network element receives from the message of SGW,, determine that then this network element of restarting is the first network mobility managed network element if detecting certain mobile management network element restarts.

9, the data reconstruction method after restarting as each described equipment of claim 1 to 8, it is characterized in that, when the described first network mobility managed network element was service universal grouping wireless business supporting node SGSN among global system for mobile communications or the enhanced data rates global system for mobile communications evolution wireless access network/universal mobile telecommunications system land radio access web GERAN/UTRAN, the described second network mobility managed network element was the SGSN among the GERAN/UTRAN or is the MME among the universal mobile telecommunications system land radio access web E-UTRAN of evolution;

When the described first network mobility managed network element was MME among the E-UTRAN, the described second network mobility managed network element was the SGSN among the GERAN/UTRAN or is the MME among the E-UTRAN.

10, the data reconstruction method after restarting as each described equipment of claim 1 to 8, it is characterized in that, described context is specially: mobile management MM context, perhaps MM context and bearer context, perhaps MM context and packet data protocol PDP Context.

11, the data reconstruction method after equipment as claimed in claim 10 is restarted is characterized in that, restarts when SGW detects the described first network mobility managed network element, when determining the UE relevant with the first network mobility managed network element, further comprises:

Described SGW sends to the described first network mobility managed network element with bearer context information or the PDP Context information of described UE.

12, the data reconstruction method after equipment as claimed in claim 11 is restarted, it is characterized in that described SGW sends to and also carries indication information in the message of the described second network mobility managed network element and give the described first network mobility managed network element with the MM contextual information of indicating the second network mobility managed network element only to return described UE.

13, the data reconstruction method after equipment as claimed in claim 10 is restarted, it is characterized in that, described SGW notifies the second network mobility managed network element to recover also to carry in the contextual message of described UE in the first network mobility managed network element bearer context information or the PDP Context information of described UE, and described method also comprises:

The second network mobility managed network element is with the bearer context information of the UE of self or PDP Context information updating bearer context information or the PDP Context information for the described UE that SGW provided.

14, the data reconstruction method after equipment as claimed in claim 11 is restarted, it is characterized in that the described first network mobility managed network element sends to and also carries indication information in the message of the described second network mobility managed network element and only return the MM contextual information of described UE to indicate the second network mobility managed network element.

15, the data reconstruction method after equipment as claimed in claim 11 is restarted is characterized in that, the first network mobility managed network element is according to the contextual information that obtains, and the context that recovers described UE is specially:

The described first network mobility managed network element is according to the bearer context that recovers described UE from the bearer context information of the SGW or the second network mobility managed network element; Perhaps according to the PDP Context that recovers described UE from the PDP Context information of the SGW or the second network mobility managed network element; And/or,

The described first network mobility managed network element is according to the MM context that recovers described UE from the MM contextual information of the second network mobility managed network element.

16, the equipment as claimed in claim 15 data reconstruction method of restarting, it is characterized in that, when the first network mobility managed network element received from the bearer context information of the SGW and the second network mobility managed network element or PDP Context information, the described first network mobility managed network element was according to the bearer context that recovers described UE from the bearer context information of SGW; According to the PDP Context that recovers described UE from the PDP Context information of SGW.

17, the data reconstruction method after equipment as claimed in claim 15 is restarted is characterized in that, further comprises:

Keep the resource of described UE on PDN GW; Perhaps,

After the described first network mobility managed network element recovers the bearer context or PDP Context of described UE, send bearer context or PDP Context that message informing PDN GW creates described UE, carry the Internet protocol IP address that described UE uses in the described message before the first network mobility managed network element is restarted.

18, the data reconstruction method after equipment as claimed in claim 15 is restarted is characterized in that, when SGW detects the first network mobility managed network element and restarts, further comprises:

Keep bearer context or the PDP Context of described UE on SGW.

19, a kind of mobile management network element is characterized in that, comprising: detecting unit, UE determining unit, message sending unit, wherein:

20, a kind of mobile management network element is characterized in that, comprising: message sink unit, contextual information acquiring unit, and the context recovery unit, wherein:

21, a kind of mobile management network element is characterized in that, comprising: message sink unit, UE determining unit, and message sending unit, wherein:

22, a kind of mobile management network element is characterized in that, comprising: message sink unit, context recovery unit, wherein:

23, a kind of communication system is characterized in that, comprising: the first network mobility managed network element, the second network mobility managed network element, wherein:

24, communication system as claimed in claim 23 is characterized in that, also comprises PDN GW, is used for keeping the resource of described UE when the first network mobility managed network element is restarted.

25, communication system as claimed in claim 23 is characterized in that, also comprises PDN GW,

The described first network mobility managed network element, also be used for behind the bearer context or PDP Context that recover described UE, send bearer context or PDP Context that message informing PDN GW creates described UE, carry the IP address that described UE uses in the described message before the first network mobility managed network element is restarted;

The IP address of the UE that provides according to the first network mobility managed network element is provided described PDN GW, creates bearer context or the PDP Context of described UE.

26, a kind of communication system is characterized in that, comprising: SGW, the first network mobility managed network element, the second network mobility managed network element, wherein:

27, communication system as claimed in claim 26 is characterized in that, also comprises PDN GW, is used for keeping the resource of described UE when the first network mobility managed network element is restarted.

28, communication system as claimed in claim 26 is characterized in that, also comprises PDN GW,

29, a kind of communication system is characterized in that, comprising: SGW, the first network mobility managed network element, the second network mobility managed network element, wherein:

30, communication system as claimed in claim 29 is characterized in that, also comprises PDN GW, is used for keeping the resource of described UE when the first network mobility managed network element is restarted.

31, communication system as claimed in claim 29 is characterized in that, also comprises PDN GW,