Method and device for maintaining service continuity of user equipment after updating tracking area

A technology for tracking area update and user equipment, applied in the field of communication, can solve problems such as UE service interruption and inoperability, and achieve the effect of improving user experience and maintaining service continuity

Active Publication Date: 2012-10-31
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the TAU process, there is no signaling on the S1 port to notify the eNodeB that the SGW that the UE accesses has changed, so the eNodeB will still forward the UE's uplink service packets to SGW1, but at this time the UE's bearer has been deleted from SGW1. Context (including UE bearer uplink IP address and TEID), although SGW1 has received the UE's uplink service packet, it cannot proceed to the next step, resulting in interruption of the UE's service
[0015] Aiming at the problem of UE service interruption caused by the eNodeB not being able to know the change of the bearer uplink IP address and TEID of the UE in the above scenario of the related art, no effective solution has been proposed yet.

Method used

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  • Method and device for maintaining service continuity of user equipment after updating tracking area
  • Method and device for maintaining service continuity of user equipment after updating tracking area
  • Method and device for maintaining service continuity of user equipment after updating tracking area

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Figure 6 It is a flow chart of maintaining service continuity of the UE after the TAC configuration change of the cell TAC of the eNodeB causes the UE to initiate a TAU with the eNodeB unchanged and the SGW changed according to the preferred embodiment 1 of the present invention (i.e. Scenario 1), as shown in Figure 6 As shown, the process includes the following steps (step S602-step S610):

[0056] Step S602, UEATTACH (attach) succeeds, access SGW1, establish bearer context on SGW1, and data transmission is normal;

[0057] Step S604, the eNodeB configures the TAC change of the cell, and after receiving the updated broadcast, the UE finds that the TA of the cell has changed, and the UE is not registered in the TA, and initiates the TAU process;

[0058] Step S606, MME receives the TAU request, finds that the new TA does not belong to the service area of ​​SGW1, judges that SGW needs to be reselected, and MME initiates the bearer creation process at SGW2;

[0059] S...

Embodiment 2

[0062] Figure 7 According to preferred embodiment 1 of the present invention, the UE moves between different TAs in the eNodeB, causing the UE to initiate a TAU with the eNodeB unchanged and the SGW changed (i.e. Scenario 2) to maintain the service continuity of the UE, as shown in Figure 7 As shown, the process includes the following steps (step S702-step S710):

[0063] Step S702, UEATTACH (attach) succeeds, access SGW1, establish bearer context on SGW1, and data transmission is normal;

[0064] Step S704, the UE moves between different TAs in the eNodeB. After receiving the broadcast of the moving target cell, the UE finds that the TA of the cell has changed, and the UE is not registered in the TA, and initiates a TAU process;

[0065] Step S706, MME receives the TAU request, finds that the new TA does not belong to the service area of ​​SGW1, judges that SGW needs to be re-selected, and MME initiates a bearer creation process at SGW2;

[0066] Step S708, the SGW2 beare...

Embodiment 3

[0070] Figure 8 It is a flow chart of maintaining service continuity of the UE after the TAC configuration change of the cell TAC of the eNodeB causes the UE to initiate a TAU with the eNodeB unchanged and the SGW changed according to the preferred embodiment 2 of the present invention (i.e. Scenario 1), as shown in Figure 8 As shown, the process includes the following steps (step S802-step S808):

[0071] Step S802, UEATTACH (attach) succeeds, access SGW1, establish bearer context on SGW1, and data transmission is normal;

[0072] Step S804, the eNodeB configures the TAC change of the cell, and after the UE receives the updated broadcast, it finds that the TA of the cell has changed, and the UE is not registered in the TA, and initiates the TAU process;

[0073] Step S806, MME receives the TAU request and finds that the new TA does not belong to the service area of ​​SGW1, and the eNodeB accessed by the UE has not changed, then the MME does not re-select the SGW, and still...

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Abstract

The invention discloses a method and a device for maintaining service continuity of user equipment (UE) after updating a tracking area. The method is as follows: when the UE initiates a request of tracking area update (TAU), a mobility management entity (MME) judges whether an updated signal gateway (SGW) is the same as a source gateway (SGW); if yes, the MME further judges whether a current evolution NodeB (eNodeB) accessed into the UE changes or not; and if no, the MME selects the signal gateway (SGW) to offer a service to the UE and sends a notification message to the eNodeB to indicate the UE is changed to the source gateway (SGW) service area or the MME stops selecting the signal gateway (SGW) for the UE, but directly indicates the UE to accept service in the source gateway (SGW). Due to the adoption of the method, the service continuity of the UE is kept during the process of TAU, so that the user experience is improved.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for maintaining service continuity of user equipment after tracking area updates. Background technique [0002] In the EPS (Evolved Packet System, evolved packet system) in the LTE (Long Term Evolution, long-term evolution) system, the SGW (Serving Gateway, Serving Gateway) has a corresponding service area, and the granularity of the service area is TA (Tracking Area, tracking area). The service areas of different SGWs may overlap. When the MME (Mobility Management Entity, mobility management entity) selects the SGW for the UE (User Equipment, user equipment), it needs to be based on the network topology. [0003] When the UE is moving, the TAU (Tracking Area Update, Tracking Area Update) of TA change is triggered, and if the newly entered TA of the UE is not in the service area of ​​the original SGW accessed by the UE, the MME will select a new SGW for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W68/00H04W76/04
CPCH04W36/00H04W8/08H04W48/20H04W60/04H04W88/005H04W92/045H04W76/22H04W36/0033H04W76/20
Inventor 孙伟张荣
Owner ZTE CORP
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