CN101175307A - Method and system for reducing service interruption - Google Patents

Abstract

The present invention provides a method for reducing service interruptions. In the method, when UE needs to update a mobile management entity (MME), user equipment (UE) preserves the used carrier information, a source user plane entity (UPE) also preserves the carrier information of the UE, the UE registers to the target MME and continues to use the source UPE. Moreover, the present invention also provides a system used to reduce service interruptions, which includes the UE, the target mobile management entity (MME) and the source user plane entity (UPE). In the present invention, the UE does not need to reselect a new UPE but continues to use the original UPE which serves the UE, the IP carrier does not need to be reestablished, and for the UE having currently performed services, the service connection does not need to be reestablished either, thus decreasing the interruption time of services and ensuring the service experience of users.

Description

A kind of method and system that reduce service disconnection

Technical field

The present invention relates to mobile communication technology, relate in particular to a kind of method and system that reduce service disconnection.

Background technology

In order to strengthen following mobile network's competitiveness, third generation partner program (3GPP, The3rd Generation Partnership Project) the main developing direction of its next stage is locked on the evolution system framework (SAE, System Architecture Evolution) of many network integrations.Referring to SAE network architecture schematic diagram shown in Figure 1, the user both can insert evolution block core net (Evolved Packet Core) by the 3GPP connecting system, also can pass through non-3GPP (non 3GPP) connecting system and insert evolution block core net, wherein, described 3GPP connecting system is General Packet Radio Service System GPRS or universal mobile telephone system UMTS or evolution system framework SAE etc.; Described non-3GPP connecting system is WLAN (wireless local area network) WLAN or micro-wave access global inter communication network WiMAX or code division multiple access system CDMA or CDMA2000 etc.

As shown in Figure 1, evolution block core net mainly comprises Mobility Management Entity (MME, MobilityManagement Entity)/user entity (UPE, User Plane Entity), 3GPP anchor point (Anchor) and three logic function modules of SAE Anchor; Connecting system anchor point (IASA, InterAccess Systems Anchor) comprises 3GPP Anchor and SAE Anchor.Wherein, MME is responsible for the mobile management of chain of command, comprises the management of user's context and mobile status, distributing user temporary identity sign, safety function etc.; UPE is responsible for initiating paging for downlink data under the idle condition, and Internet protocol (IP) bearing parameter and the interior routing iinformation of network etc. are preserved in management; 3GPP Anchor is the anchor point between 2G/3G and Long Term Evolution (LTE, the Long Term Evolution) connecting system; SAE Anchor then serves as the user's face anchor point between different access systems.

In the practical application scene, network side may trigger subscriber equipment (UE, User Equipment) and change MME/UPE, and the MME/UPE notice UE initiation reattachment (Re-Attachment) such as the current connection of UE is attached to new MME/UPE again and gets on; Perhaps the MME/UPE of the current connection of UE notice UE carries out tracing section updating (TAU) or the like.But, because in processes such as reattachment or TAU, UE will discharge the beared information that self used originally and be connected (RRC) with Radio Resource, reselect a new UPE, rebulid the IP carrying, therefore, if UE this moment has other professional connections, these professional connections all need to rebulid so, and the easy like this interruption that causes business influences user's business impression.

Need to prove that MME herein refers to all chain of command entities, UPE refers to all user entities, and is not limited only in the SAE network.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and system that reduce service disconnection, reduces service disconnection.

For achieving the above object, the method for minimizing service disconnection provided by the invention mainly comprises:

When user equipment (UE) need upgrade Mobility Management Entity MME, UE kept its employed beared information, and source user face entity UPE also keeps the beared information of this UE, and UE registers on the purpose MME, and continued use source UPE.

The present invention also provides a kind of system that reduces service disconnection, and this system comprises user equipment (UE), purpose Mobility Management Entity MME and source user face entity UPE, wherein,

UE is used to keep the beared information of its use, and is used for sending the registration request to purpose MME;

Purpose MME is used to receive the registration request from UE, UE is registered, and be used for the ownership MME information that notification source UPE upgrades this UE;

Source UPE is used to keep the beared information of this UE, and is used to receive the notice from purpose MME, upgrades the ownership MME information of this UE.

This shows, in the present invention, when separating with UPE and upgrade to trigger under the reason at specific MME, (heavily distributes) MME as the MME load, when UE need upgrade MME, UE keeps its employed beared information and does not discharge, and source UPE also keeps the beared information of this UE, and UE registers on the purpose MME, and continues use source UPE.Like this, UE just need not to reselect a new UPE, but continue to use original UPE to be its service, owing to remain with the beared information of this UE on the original UPE, therefore do not need to distribute new IP address for UE, do not need to rebulid the IP carrying yet, thereby can simplify the process that MME upgrades, shorten the time that MME upgrades, for the current UE that has business to carry out, do not need to rebulid professional the connection, can reduce the break period that UE obtains service like this; And,,, therefore carry out the IMS registration again with regard to not needing because UE can keep the IP address not change for the UE that the IMS ability is arranged.

Description of drawings

Fig. 1 is a SAE network architecture schematic diagram of the prior art.

Fig. 2 is the system configuration schematic diagram that reduces service disconnection in the embodiment of the invention.

Fig. 3 is the reattachment schematic flow sheet in the embodiment of the invention one.

Fig. 4 is the TAU schematic flow sheet in the embodiment of the invention two.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.

The basic thought of minimizing service disconnection method provided by the invention is, when MME separates with UPE and need upgrade MME owing to specific triggering reason UE, UE keeps the beared information that uses its (as block data protocol context PDP Context etc.) last time, and source UPE also keeps the beared information of this UE, UE registers on the purpose MME, and continues use source UPE.

Wherein, described triggering reason for renewing is heavily distributed for MME load or is stopped to provide service etc. for source MME that UE registered.UE upgrades the process of MME can initiate by UE is autonomous, breaks down or UE when moving to a new lane place such as the MME when the current registration of UE, and UE initiatively registers on the new MME; The process that UE upgrades MME also can be to be triggered by the notification message that network side issues, tracing section updating (TAU) order that reattachment request of initiating to UE such as source MME or source MME initiate to UE etc.

Corresponding method provided by the present invention, the present invention also provides a kind of system that reduces service disconnection, referring to shown in Figure 2, this system mainly comprises UE, purpose MME and source UPE, wherein, UE is used to keep the beared information of its use, and is used for sending the registration request to purpose MME; Purpose MME is used to receive the registration request from UE, UE is registered, and be used for the ownership MME information that notification source UPE upgrades this UE; Source UPE is used to keep the beared information of this UE, and is used to receive the notice from purpose MME, upgrades the ownership MME information of this UE.

Wherein, described registration request is for adhering to request; It perhaps is tracing section updating request etc.Need to prove, in the MME of reality renewal process, may also can relate to other more entity, as evolution wireless access network (E-RAN, Evolved RAN), local assigned user server (HSS, Home Subscriber Server) etc., be elaborated below in conjunction with two specific embodiments.

Embodiment one

Network side is initiated the reattachment request to UE, and request UE is attached on the new MME again, and referring to shown in Figure 3, the reattachment flow process in the present embodiment mainly may further comprise the steps:

Step 301: source MME sends reattachment request (Re-Attachment Request) to UE, and request UE adheres to again, carries the cause value that triggers reattachment in this request, and heavily distribution or source MME stop to provide service etc. as the MME load.

After step 302:UE receives the reattachment request of source MME initiation, when the cause value that carries in this request of discovery belongs to the reason (as the heavily distribution of MME load) that need not to change UPE, then keep the beared information that adhered to its last time, promptly keep its beared information on the UPE of source, in addition, UE also can preserve the RRC connection of its last time.

Step 303:UE sends to purpose MME and adheres to request (Attach Request), comprising the beared information of UE, comprises the UPE information of adhering to before the UE in this beared information.

Wherein, purpose MME determines and can inform UE by source MME, is perhaps determined from line search by UE.Such as, source MME is carried at purpose MME address in the reattachment request and sends to UE, indication UE registers on the purpose MME, UE initiates to adhere to request by E-RAN to purpose MME, and purpose MME address offered E-RAN, E-RAN uses this purpose MME pairing purpose MME in address to serve as UE, and the request of adhering to from UE of receiving is transmitted to purpose MME; If UE does not provide purpose MME the address to E-RAN, E-RAN can be recorded as UE according to the MME state information and selects a purpose MME to serve so, with the purpose MME that request is transmitted to selection that adheres to that receives.

In addition, in this flow process, employed beared information when source UPE also needs corresponding reservation UE to adhere to last time does not carry out the release of bearing resource.

The log-on message before if UE has, the log-on message before then also can carrying in adhering to request identifies as temporary identity; If UE does not have log-on message, then can adhere to and carry permanent identity information in the request in the past at this.Share under the situation at network, this adheres to selected network or the MME information of portability in the request, and E-RAN is according to these Information Selection purposes MME.In addition, this adheres to goes back portability IP access bearer information in the request, as user's IP address and APN (APN, Access PointName) etc.

Step 304: if UE provides log-on message in the past, purpose MME then sends the request of obtaining user profile according to log-on message to source MME in the past.

Step 305: source MME returns to purpose MME with user profile (as the permanent user identity sign).

In step 303, if the UPE information that UE does not have to adhere to before sends to purpose MME, so, in step 305, source MME also will send to purpose MME with the UPE information of adhering to before this UE.

Step 306: purpose MME carries out authentication (Authentication) to the user.

Step 307: purpose MME initiates register requirement to HSS.

After step 308:HSS received register requirement, the user profile that notification source MME deletes this UE maybe user ID of this UE was set to not in network, and the full detail of UE is inserted among the purpose MME.

Step 309:HSS notice purpose MME succeeds in registration.

Step 310: purpose MME confirms to succeed in registration to HSS.

Step 311: purpose MME notice UPE upgrades the ownership MME information of this UE.

UPE herein is source UPE, is purpose UPE again.

Step 312: purpose MME is that this UE distributes new RRC key (RRC key), the fail safe protection of the RRC signaling that is used to eat dishes without rice or wine, and the new RRC key that will distribute sends to E-RAN, as set up request (Setup UE Context) transmission by user's context.

After step 313:E-RAN received new RRC key, MME returned affirmation to purpose, returned as setting up response (Setup UE Context Ack) by user's context.

Step 314: purpose MME accepts the request of adhering to of UE, and returns to adhere to and accepts message (AttachAccept) to UE, and distribute a temporary identity sign to UE.

Purpose MME can not distribute the temporary identity sign to UE yet.

Step 315:UE returns to purpose MME and adheres to successfully acknowledge message (Attach Complete).

So far, whole reattachment process is finished.

Need to prove, Fig. 3 is primarily aimed at session management (SM, Session Management) function has been described in detail on MME, reattachment process and Fig. 3 basically identical of SM function on UPE, difference is that purpose MME is that the new RRC key that UE distributes is transmitted to E-RAN by UPE (source UPE).

Embodiment two

Network side indication UE carries out tracing section updating (TAU), and notice UE is connected on the new MME, and referring to shown in Figure 4, the TAU flow process in the present embodiment mainly may further comprise the steps:

Step 401: source MME sends TAU order (TAU command) to UE, and indication UE carries out tracing section updating, carries in this message and triggers the reason for renewing value, heavily distributes or source MME stops to provide service etc. as the MME load.

After step 402:UE receives the TAU order of source MME initiation, when the cause value that carries in finding this message belongs to the reason (as the heavily distribution of MME load) that need not to change UPE, then keep the beared information that adhered to its last time, promptly keep its beared information on the UPE of source, in addition, UE also can preserve the RRC connection of its last time.

Step 403:UE sends TAU request (TAU Request) to purpose MME, comprising the beared information of UE, comprises the UPE information of adhering to before the UE in this beared information.

Wherein, purpose MME determines and can inform UE by source MME, is perhaps determined from line search by UE.Such as, source MME is carried at purpose MME address in the TAU order and sends to UE, indication UE registers on the purpose MME, UE initiates the TAU request by E-RAN to purpose MME, and purpose MME address offered E-RAN, E-RAN uses this purpose MME pairing purpose MME in address to serve as UE, and the TAU request from UE of receiving is transmitted to purpose MME; If UE does not provide purpose MME the address to E-RAN, E-RAN can be recorded as UE according to the MME state information and selects a purpose MME to serve so, the TAU request of receiving is transmitted to the purpose MME of selection.

In addition, in this flow process, employed beared information when source UPE also needs corresponding reservation UE to adhere to last time does not carry out the release of bearing resource.

The log-on message before if UE has, the log-on message before then also can carrying in the TAU request identifies as temporary identity; If UE does not have log-on message, then can in the TAU request, carry permanent identity information in the past.Share under the situation at network, selected network or the MME information of portability in this TAU request, E-RAN is according to these Information Selection purposes MME.In addition, go back portability IP access bearer information in this TAU request, as user's IP address and APN (APN, AccessPoint Name) etc.

Step 404: if UE provides log-on message in the past, purpose MME then sends the request of obtaining user profile according to log-on message to source MME in the past.

Step 405: source MME returns to purpose MME with user profile (as the permanent user identity sign).

In step 403, if the UPE information that UE does not have to adhere to before sends to purpose MME, so, in step 405, source MME also will send to purpose MME with the UPE information of adhering to before this UE.

Step 406: purpose MME carries out authentication (Authentication) to the user.

Step 407: purpose MME initiates register requirement to HSS.

After step 408:HSS received register requirement, the user profile that notification source MME deletes this UE maybe user ID of this UE was set to not in network, and the full detail of UE is inserted among the purpose MME.

Step 409:HSS notice purpose MME succeeds in registration.

Step 410: purpose MME confirms to succeed in registration to HSS.

Step 411: purpose MME notice UPE upgrades the ownership MME information of this UE.

UPE herein is source UPE, is purpose UPE again.

Step 412: purpose MME is that this UE distributes new RRC key (RRC key), the fail safe protection of the RRC signaling that is used to eat dishes without rice or wine, and the new RRC key that will distribute sends to E-RAN, as set up request (Setup UE Context) transmission by user's context.

After step 413:E-RAN received new RRC key, MME returned affirmation to purpose, returned as setting up response (Setup UE Context Ack) by user's context.

Step 414: purpose MME accepts the TAU request of UE, returns TAU and accepts message (TAUAccept) to UE, and distribute a temporary identity sign to UE.

Purpose MME can not distribute the temporary identity sign to UE yet.

Step 415:UE returns TAU to purpose MME and finishes message (TAU Complete).

So far, whole TAU process finishes.

Need to prove, Fig. 4 is primarily aimed at session management (SM, Session Management) function has been described in detail on MME, reattachment process and Fig. 4 basically identical of SM function on UPE, difference is that purpose MME is that the new RRC key that UE distributes is transmitted to E-RAN by UPE (source UPE).

The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to restriction the present invention; within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (15)

1. method that reduces service disconnection, it is characterized in that, this method comprises: when user equipment (UE) need upgrade Mobility Management Entity MME, UE keeps its employed beared information, and source user face entity UPE also keeps the beared information of this UE, UE registers on the purpose MME, and continues use source UPE.

2. method according to claim 1 is characterized in that, described UE upgrades the process of MME independently to be initiated by UE.

3. method according to claim 1 is characterized in that, the process that described UE upgrades MME is triggered by the notification message that network side issues.

4. method according to claim 3 is characterized in that, reattachment request that to be source MME initiate to UE of described notification message or the tracing section updating order of initiating to UE for source MME.

5. according to claim 3 or 4 described methods, it is characterized in that, carry in the described notification message to upgrade and trigger cause value.

6. method according to claim 5 is characterized in that, described cause value heavily distributes for MME load or stops to provide service for source MME.

7. according to claim 3 or 4 described methods, it is characterized in that, further carry purpose MME address in the described notification message.

8. method according to claim 1 is characterized in that, this method further comprises: the Radio Resource that UE keeps its use connects.

9. method according to claim 1, it is characterized in that, the process that described UE registers on the purpose MME comprises: UE initiates the registration request to purpose MME, after purpose MME receives the registration request of UE initiation, UE is carried out authentication, and register, and return the registration success response to UE in the back of succeeding in registration to local assigned user server HSS.

10. method according to claim 9, it is characterized in that, described UE comprises to the process that purpose MME initiates the registration request: UE sends the registration request to evolution wireless access network E-RAN, and purpose MME address offered E-RAN, the registration request that E-RAN will receive is transmitted to this purpose MME pairing purpose MME in address;

Perhaps, UE sends the registration request to E-RAN, and E-RAN is recorded as this UE according to the MME state information and selects purpose MME, and the registration request that will receive is transmitted to purpose MME.

11., it is characterized in that described registration request is for adhering to request according to claim 9 or 10 described methods, described registration success response is for adhering to acceptance;

Perhaps, described registration request is the tracing section updating request, and described registration success response is that tracing section updating is accepted.

12. method according to claim 1 is characterized in that, this method further comprises: purpose MME obtains source UPE information, and notification source UPE upgrades the ownership MME information of described UE.

13. method according to claim 12 is characterized in that, the mode that described purpose MME obtains source UPE information comprises: purpose MME obtains source UPE information from source MME; Perhaps, UE sends to purpose MME with source UPE information.

14. method according to claim 1 is characterized in that, this method further comprises: purpose MME redistributes Radio Resource and connects key RRC key, and the RRC key that distributes is sent to evolution wireless access network E-RAN.

15. a system that reduces service disconnection is characterized in that, this system comprises user equipment (UE), purpose Mobility Management Entity MME and source user face entity UPE, wherein,

UE is used to keep the beared information of its use, and is used for sending the registration request to purpose MME;

Purpose MME is used to receive the registration request from UE, UE is registered, and be used for the ownership MME information that notification source UPE upgrades this UE;

Source UPE is used to keep the beared information of this UE, and is used to receive the notice from purpose MME, upgrades the ownership MME information of this UE.

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