WO2016086673A1

WO2016086673A1 - Resource processing optimization method, server gateway and optimization system

Info

Publication number: WO2016086673A1
Application number: PCT/CN2015/084945
Authority: WO
Inventors: 张庆武
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-01
Filing date: 2015-07-23
Publication date: 2016-06-09
Also published as: CN105722154B; CN105722154A

Abstract

Disclosed are a resource processing optimization method, server gateway and optimization system. The method comprises the following steps: if a position of a user equipment (UE) is changed, receiving a handover request message transmitted by a target mobility management entity (target MME) and a resource processing provisional refusal message being a response from a source MME; processing the handover request message, and replaying to the target MME a handover success response; if the source MME and the target MME have completed a UE resource handover, transmitting to the target MME a resource processing request message, and performing the resource processing upon receipt of a resource processing success message being a response from the target MME. When a UE is in a MME handover, the present invention can enable the UE to ensure a UE resource is created, updated and deleted successfully.

Description

Resource processing optimization method and service gateway and optimization system

Technical field

The present invention relates to the field of communications technologies, and in particular, to an optimization method for a core network gateway resource processing, a service gateway, and an optimization system.

Background technique

EPS (Evolved Packet System) is an IP (Internet Protocol)-based network architecture proposed by the 3GPP (3rd Generation Partnership Project). An open and flexible service environment can support user equipment (UE) to access the IP network, provide users with fast and stable access status, and improve packet data transmission to meet the growth of IP data traffic. Existing specifications for UEs accessing IP networks through EPS, such as 3GPP TS 23.401 and 3GPP TS 29.274, etc., already have signaling and flow descriptions of UE handovers in the packet core network. However, when an MME (Mobility Management Entity) handover occurs, the SG-W (Serving-GateWay) and the PGW (Packet Data Network-GateWay) are created due to the handover of the MME. The update and deletion of user resources failed, resulting in the UE being unable to create, update, and delete resources in a short period of time.

The above content is only used to assist in understanding the technical solutions of the present invention, and does not constitute an admission that the above is prior art.

Summary of the invention

The main purpose of the embodiment of the present invention is to provide an optimization method for the core network gateway SGW resource processing, which is to ensure that the creation, update, and deletion of the UE resources are successful when the MME handover occurs, so that the user service is not switched by the MME. Interrupted.

To achieve the above objective, an optimization method for processing a core network gateway SGW resource according to an embodiment of the present invention includes the following steps:

Receiving a handover request message sent by a target mobility management entity (Target MME) and a resource processing temporary rejection message of a source mobility management entity (Source MME) response when the location of the user equipment UE changes;

Processing the received handover request message and replying to the Target MME with a handover success response;

When the source MME and the Target MME complete the UE resource handover, the resource processing request message is sent to the Target MME, and the resource optimization process is performed after receiving the resource processing success message of the Target MME response.

In the embodiment of the present invention, when the location of the user equipment (UE) changes, the step of receiving the handover request message sent by the Target MME and the resource processing temporary rejection message sent by the Source MME further includes:

Receiving a resource processing request message sent by the packet data network gateway PGW;

Forwarding the resource processing request message to the source mobility management entity Source MME.

In the embodiment of the present invention, when the source MME and the Target MME complete the UE resource handover, the resource processing request message is sent to the Target MME, and the resource optimization request is performed after receiving the resource processing success message of the Target MME response. Before the steps include:

And determining, according to the received handover request message and the resource processing temporary rejection message, whether the Source MME and the Target MME complete the UE resource handover.

In the embodiment of the present invention, after the step of determining whether the source MME and the target MME complete the UE resource switching according to the received handover request message and the resource processing temporary rejection message, the method further includes:

If the source MME and the Target MME do not complete the UE resource handover, the resource response failure message is sent to the PGW.

In the embodiment of the present invention, when the source MME and the Target MME complete the UE resource handover, the resource processing request message is sent to the Target MME, and the resource optimization is performed after receiving the resource processing success message of the Target MME response. The processing steps also include:

A successful message is processed to the PGW response resource.

In addition, to achieve the above object, the embodiment of the present invention further provides a core network gateway SGW, where the SGW includes:

The first receiving module is configured to: when the location of the user equipment UE changes, receive the MME handover request message sent by the target mobility management entity Target MME and the resource processing temporary rejection message that is sent by the source mobility management entity Source MME;

a first processing module, configured to process the received handover request message, and return a handover success response to the Target MME;

And the second processing module is configured to: when the source MME and the Target MM complete the UE resource handover, send a resource processing request message to the Target MME, and perform resource optimization processing after receiving the resource processing success message of the Target MME response .

In the embodiment of the present invention, the SGW further includes:

a second receiving module, configured to receive a resource processing request message sent by the packet data network gateway PGW;

And a forwarding module, configured to forward the resource processing request message to the source mobility management entity Source MME.

In the embodiment of the present invention, the SGW further includes:

The determining module is configured to determine, according to the received MME switching request message and the resource processing temporary reject message, whether the Source MME and the Target MME complete the UE resource switching.

In the embodiment of the present invention, the SGW further includes:

The first response module is configured to respond to the resource processing failure message to the PGW if the source MME and the Target MME do not complete the UE resource handover.

In the embodiment of the present invention, the SGW further includes:

The second response module is configured to: when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME, and receive the resource processing success message of the Target MME response and complete the resource optimization processing. After that, the PGW responds to the resource processing success message.

In addition, to achieve the above object, an embodiment of the present invention further provides an optimization system, where the optimization system includes a Source MME, a Target MME, a PGW, and an SGW as described above.

The Source MME includes:

a third receiving module, configured to receive a resource processing request message forwarded by the SGW;

The third response module is configured to respond to the temporary rejection message to the SGW when the location of the user equipment UE changes.

The Target MME includes:

The first sending module is configured to send an MME switching request message to the SGW when the location of the user equipment UE changes;

The fourth response module is configured to receive the resource processing request message sent by the SGW when the source MME and the target MM complete the UE resource switching, and respond to the resource processing success message to the SGW after the resource processing succeeds.

The PGW includes:

The sending module is configured to send a resource processing request message to the SGW.

In the embodiment of the present invention, the PGW further includes:

a fourth receiving module, configured to receive a resource processing failure message of the SGW response when the source MME and the Target MME do not complete the UE resource switching;

The fifth receiving module is configured to: when the source MME and the target MME complete the UE resource switching, the SGW sends a resource processing request message to the Target MME, and after the SGW receives the resource processing success message of the Target MME response and completes the resource optimization process, A resource processing success message that receives the SGW response.

The core network gateway SGW resource processing optimization method provided by the embodiment of the present invention determines whether the Source MME and the Target MME complete the UE resource handover according to the received handover request message and the temporary rejection message, and completes the UE resource switching in the Source MME and the Target MME. Re-sending the resource processing request message to the Target MME, and completing the resource optimization process after receiving the resource processing success message of the Target MME response, so that the UE can ensure the creation, update, and deletion of the UE resource when the MME handover occurs. Therefore, the user service is not interrupted due to the handover of the MME.

DRAWINGS

1 is a schematic flowchart of a method for optimizing a core network gateway SGW resource processing according to an embodiment of the present invention;

2 is a schematic flowchart of another method for optimizing a core network gateway SGW resource processing according to an embodiment of the present invention;

3 is a schematic diagram of functional modules of a core network gateway SGW according to an embodiment of the present invention;

4 is a schematic diagram of another functional module of a core network gateway SGW according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of functional modules of an optimization system according to an embodiment of the present invention; FIG.

6 is a schematic diagram of functional modules of a Source MME in an optimization system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of functional modules of a Target MME in an optimization system according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of functional modules of a PGW in an optimization system according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of data flow of an optimization system according to an embodiment of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention provides a core network gateway (SGW) resource processing optimization method. Referring to FIG. 1, in an embodiment, the core network gateway SGW resource processing optimization method includes the following steps:

Step S101: When the location of the UE changes, the handover request message sent by the target MME and the resource processing temporary rejection message responded by the source MME are received;

In this embodiment, when the location of the UE changes, the Target MME sends a handover request message to the SGW, notifying the SGW that the handover of the Source MME and the Target MME and other related UE information are occurring.

In this embodiment, since the source MME and the Target MME are processing the mobility handover of the UE, according to the 3GPP 29274-C50 protocol specification, the Source MME returns a response message with a cause value of 110 to the SGW, and is temporarily rejecting the UE mobility handover procedure. .

Step S102, processing the received handover request message, and returning a handover success response to the Target MME;

In this embodiment, when receiving the handover request message sent by the Target MME, the SGW processes the handover request information, and if successful, returns a handover success response to the Target MME; if the processing fails, returns a handover to the Target MME. Failure response.

According to the existing protocol specification (3GPP 23401-C50), the processing is as follows:

After receiving the creation, update, or deletion failure message of the Source MME response, the SGW processes its own related resources and replies to the PGW with a response that fails to create, update, or delete;

After receiving the temporary rejection message, the PGW needs to wait for the scheduled time to re-initiate the process of creating, updating, or deleting.

It can be seen that the existing protocol specification (3GPP 23401-C50) will cause the creation, update or deletion of user resources to fail, and the PGW needs to wait for a predetermined time to initiate the creation, update or deletion of the service again, resulting in the user being unable to make new calls within the predetermined time. Business Process.

The process adopted by the present invention is as follows:

Step S103, when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME3, and perform resource optimization processing after receiving the resource processing success message of the Target MME response.

In this embodiment, if the source MME and the Target MME complete the UE resource switching, the SGW does not reply to the PGW with a failure response, but sends a create, update or delete request message to the Target MME, and the Target MME receives the create, update or delete request message. After the relevant resources are successfully created, updated, or deleted, the SGW is replied to the response message that the creation, update, or deletion is successful. After receiving the success response message, the SGW processes its own related resources.

It should be understood that, when receiving the temporary reject message of the Source MME response, the SGW is not limited to being temporarily processing the UE mobility handover procedure and temporarily rejecting the cause value if the MME has not supported the protocol specification 3GPP 23401-C50 version. And in step 101, other reason values are returned, for example, the cause value is 64, and the context is not found, and SGW1 can also be processed in steps S103 and 104.

In an embodiment, as shown in FIG. 2, on the basis of the foregoing embodiment of FIG. 1, in the embodiment, before the step 101, the method further includes:

Step S104, receiving a resource processing request message sent by the packet data network gateway PGW;

In this embodiment, the resource processing request message includes: a resource creation, a resource update, or a resource deletion request message. In other embodiments, the resource processing request message is not limited.

Step S105, forwarding the resource processing request message to the source mobility management entity Source MME.

In this embodiment, after receiving the creation request, the update request, or the deletion request message sent by the PGW 4, the SGW1 forwards the creation request, the update request, or the deletion request message to the source mobility management entity Source MME2.

In an embodiment, as shown in FIG. 2, on the basis of the foregoing embodiment of FIG. 1, in the embodiment, before the step S103, the method further includes:

Step S106: Determine, according to the received handover request message and the resource processing temporary rejection message, whether the Source MME and the Target MME complete the UE resource handover.

In this embodiment, after the SGW receives the create, update, or delete response message temporarily rejected by the source MME to process the UE mobility switch, the SGW does not delete the UE related resource first, but determines whether the MME related information has changed, the Source MME and the Whether the Target MME completes the UE resource switching.

In an embodiment, as shown in FIG. 2, on the basis of the foregoing embodiment of FIG. 1, in this embodiment, after the step S106, the method further includes:

Step S107: If the source MME and the Target MME do not complete the UE resource handover, the device responds to the resource processing failure message to the PGW4.

In this embodiment, if the source MME and the Target MME do not complete the UE resource switching, the resource processing failure message is responded to the PGW4, and at this time, the UE-related resources, such as the initiated creation, update, or deletion of resources, may be deleted.

In an embodiment, as shown in FIG. 2, on the basis of the foregoing embodiment of FIG. 1, in the embodiment, after the step S103, the method further includes:

Step S108, responding to the resource processing success message to the PGW.

In this embodiment, after the Target MME and the SGW successfully create, update, or delete related resources, the SGW responds to the PGW with the resource processing success message. So far, the request to create, update, or delete a resource initiated by the PGW is successful. Although the handover of the MME change occurs, the new service of the user is not interrupted, and the related resources are successfully created, updated, or deleted.

The present invention also provides a core network gateway SGW1. Referring to FIG. 3, in an embodiment, in a preferred embodiment, the core network gateway SGW1 includes:

The first receiving module 101 is configured to receive, when the location of the user equipment UE changes, the MME handover request message sent by the target mobility management entity Target MME and the resource processing temporary reject message sent by the Source MME;

In this embodiment, when the location of the UE changes, the Target MME will send the handover information to the SGW1, and notify the SGW1 that the information switching between the Source MME and the Target MME and other related UE information are occurring.

In this embodiment, since the source MME and the Target MME are processing the mobility handover of the UE, according to the 3GPP 29274-C50 protocol specification, the Source MME replies with a cause value such as 110 to the SGW1, and responds to the UE mobility handover procedure and temporarily rejects the response message. .

The first processing module 102 processes the received handover request message and returns a handover success response to the Target MME.

In this embodiment, when receiving the handover request message sent by the Target MME, the SGW1 processes the handover request information, and if successful, returns a handover success response to the Target MME; if the processing fails, returns a handover to the Target MME. Failure response.

After receiving the Create, Update, or Delete failure message of the Source MME response, the SGW1 processes its own related resources and replies to the PGW with a response to the creation, update, or deletion failure.

The process adopted by the embodiment of the present invention is as follows:

In this embodiment, after receiving the create, update, or delete response message temporarily rejected by the source MME to process the UE mobility switch, the SGW1 does not delete the UE related resource first, but determines whether the MME related information has changed, the Source MME and the Whether the Target MME completes the UE resource switching.

The second processing module 103 is configured to: when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME, and perform resource optimization after receiving the resource processing success message of the Target MME response. deal with.

In this embodiment, if the source MME and the Target MME complete the UE resource switching, the SGW1 does not reply to the PGW with a failure response, but sends a create, update or delete request message to the Target MME, and the Target MME receives the create, update or delete request message. After processing the related resources, and successfully creating, updating, or deleting the related resources, the SGW1 is replied to the response message that the creation, update, or deletion is successful, and the SGW1 processes the related resources after receiving the success response message.

It should be understood that when the SGW1 receives the temporary reject message of the Source MME response, it is not limited to being processing the UE mobility handover procedure and temporarily rejecting the cause value if the MME has not supported the protocol. The 3GPP 23401-C50 version is specified, and in the step 103, other cause values are returned, for example, the cause value is 64, the context is not found, and the SGW1 can also be processed in steps S103 and 104.

In an embodiment, as shown in FIG. 4, on the basis of the foregoing embodiment of FIG. 3, in this embodiment, the SGW1 further includes:

The second receiving module 105 receives a resource processing request message sent by the packet data network gateway PGW;

The forwarding module 106 forwards the resource processing request message to the source mobility management entity Source MME.

In this embodiment, after receiving the creation request, the update request, or the deletion request message sent by the PGW, the SGW1 forwards the creation request, the update request, or the deletion request message to the source mobility management entity Source MME.

The determining module 103 is configured to determine whether the Source MME and the Target MME complete the UE resource switching according to the received MME handover request message and the resource processing temporary reject message.

As shown in FIG. 4, on the basis of the foregoing embodiment of FIG. 3, the SGW1 further includes:

The first response module 107 is configured to respond to the resource processing failure message to the PGW 4 if the source MME and the Target MME do not complete the UE resource handover.

In this embodiment, if the source MME and the Target MME do not complete the UE resource switching, the PGW responds to the resource processing failure message. At this time, the UE-related resources, such as the created creation, update, or deletion of resources, may be deleted.

The second response module 108 is configured to: when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME, and receive the resource processing success message of the Target MME response and complete the resource optimization. After processing, the resource is successfully processed to the PGW response resource.

In this embodiment, after the Target MME and the SGW1 successfully create, update, or delete related resources, the SGW responds to the PGW with the resource processing success message. So far, the request to create, update, or delete a resource initiated by the PGW is successful. Although the handover of the MME change occurs, the new service of the user is not interrupted, and the related resources are successfully created, updated, or deleted.

An embodiment of the present invention further provides an optimization system 100. Referring to FIG. 5, in an embodiment, in a preferred embodiment, the optimization system 100 includes a Source MME2, a Target MME3, a PGW4, and an SGW1 as described above.

Referring to FIG. 6, the Source MME2 includes:

The third receiving module 201 is configured to receive a resource processing request message forwarded by the SGW1.

The third response module 202 is configured to respond to the SGW1 with a temporary rejection message that the source MME2 and the Target MME3 are switching messages when the location of the user equipment UE changes.

In this embodiment, since Source MME2 and Target MME3 are processing the mobility handover of the UE, Source MME2 replies with a cause value such as 110 to SGW1 according to the 3GPP 29274-C50 protocol specification, and is temporarily rejecting the UE mobility handover procedure.

Referring to FIG. 7, the Target MME3 includes:

The first sending module 301 is configured to send an MME switching request message to the SGW1 when the location of the user equipment UE changes;

In this embodiment, when the location of the UE changes, the Target MME3 will send the handover information to the SGW1, and notify the SGW1 that the information switching of the Source MME2 and the Target MME3 and other related UE information are occurring.

The fourth response module 302 is configured to receive the resource processing request message sent by the SGW1 when the source MME2 and the Target MM complete the UE resource switching, and respond to the resource processing success message to the SGW1 after the resource processing succeeds.

In this embodiment, if Source MME2 and Target MME3 complete the UE resource handover, SGW1 does not reply to PGW4 with a failure response, but sends a create, update or delete request message to Target MME3, and Target MME3 receives the create, update or delete request message. After the related resources are successfully created, updated, or deleted, the SGW1 is replied to the response message that the creation, update, or deletion is successful. After receiving the success response message, the SGW1 creates its own related resources.

Referring to FIG. 8, the PGW 4 includes:

The second sending module 401 is configured to send a resource processing request message to the SGW1.

In an embodiment, as shown in FIG. 8, the PGW 4 further includes:

The fourth receiving module 402 is configured to receive a resource processing failure message that is sent by the SGW1 when the source MME2 and the Target MME3 do not complete the UE resource switching.

In this embodiment, if the source MME2 and the target MME3 do not complete the UE resource switching, the resource processing failure message is responded to the PGW4, and at this time, the UE-related resources, such as the initiated creation, update, or deletion of resources, may be deleted.

The fifth receiving module 403 is configured to: when the source MME2 and the Target MME3 complete the UE resource switching, the SGW1 sends a resource processing request message to the Target MME3, and after the SGW1 receives the resource processing success message of the Target MME3 response and completes the resource optimization process. Receiving a resource processing success message of the SGW1 response.

In this embodiment, after Target MME3 and SGW1 successfully create, update, or delete related resources, SGW1 responds to PGW4 with a resource processing success message. So far, the request to create, update, or delete a resource initiated by PGW4 is successful. Although the handover of the MME change occurs, the new service of the user is not interrupted, and the related resources are successfully created, updated, or deleted.

Referring to FIG. 9, in an embodiment, the data flow of the optimization system 100 is as follows:

Step S501: SGW1 receives a create, update or delete request message sent by PGW4;

Step S502: SGW1 forwards the message to Source MME2;

Step S503: When the UE location changes, the source MME2 and the Target MME3 perform UE resource switching.

Step S504: Target MME3 sends a handover request message to SGW1.

Step S505: Source MME2 responds to the resource processing temporary rejection message to SGW1;

Step S506: The SGW1 determines whether the source MME2 and the Target MME3 complete the UE resource handover. If the source MME2 and the Target MM complete the UE resource handover, the SGW1 resends the resource processing request message to the Target MME3.

Step S507: After receiving the create, update or delete request message, the Target MME3 processes the related resource, and after successfully creating, updating or deleting the related resource, responds to the SGW1 with a response message that the creation, update or deletion succeeds;

Step S508: After receiving the success response message, the SGW1 creates, updates, or deletes its own related resources, and returns a successful response message to the PGW4 after successfully processing the resource.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Industrial applicability

The technical solution provided by the embodiment of the present invention can be applied to the optimization process of the core network gateway SGW resource processing, and judge whether the Source MME and the Target MME complete the UE resource switching according to the received handover request message and the temporary rejection message, in the Source MME and When the target MME completes the UE resource handover, the target MME resends the resource processing request message to the Target MME, and completes the resource optimization process after receiving the resource processing success message of the Target MME response, so that the UE can ensure the UE resource when the MME handover occurs. The creation, update, and deletion are successful, so that the user service is not interrupted by the MME's handover.

Claims

An optimization method for core network gateway SGW resource processing includes the following steps:

When the location of the user equipment UE changes, the handover request message sent by the target mobility management entity Target MME and the resource processing temporary rejection message responded by the source mobility management entity Source MME are received;

Processing the received handover request message and replying to the Target MME with a handover success response;

When the source MME and the Target MME complete the UE resource handover, the resource processing request message is sent to the Target MME, and the resource optimization process is performed after receiving the resource processing success message of the Target MME response.
The resource processing optimization method according to claim 1, wherein, when the location of the user equipment UE changes, the handover request message sent by the target mobility management entity Target MME and the resource processing temporary rejection message of the Source MME response are further included. :

Receiving a resource processing request message sent by the packet data network gateway PGW;

Forwarding the resource processing request message to the source mobility management entity Source MME.
The resource processing optimization method according to claim 1, wherein when the source MME and the Target MME complete the UE resource handover, the resource processing request message is sent to the Target MME, and the resource processing of the Target MME response is received. Before optimizing the resource after the success message, it also includes:

And determining, according to the received handover request message and the resource processing temporary rejection message, whether the Source MME and the Target MME complete the UE resource handover.
The method for optimizing resource processing according to claim 3, wherein, after determining whether the source MME and the Target MME complete the UE resource switching, according to the received handover request message and the resource processing temporary rejection message, the method further includes:

If the source MME and the Target MME do not complete the UE resource handover, the resource response failure message is sent to the PGW.
The resource processing optimization method according to claim 1, wherein the resource processing request message is sent to the Target MME when the source MME and the Target MME complete the UE resource handover, And after the step of performing resource optimization processing after receiving the resource processing success message of the Target MME response, the method further includes:

A successful message is processed to the PGW response resource.
A core network gateway SGW, comprising:

The first receiving module is configured to: when the location of the user equipment UE changes, receive the MME handover request message sent by the target mobility management entity Target MME and the resource processing temporary rejection message that is sent by the source mobility management entity Source MME;

a first processing module, configured to process the received handover request message, and return a handover success response to the Target MME;

And the second processing module is configured to: when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME, and perform resource optimization processing after receiving the resource processing success message of the Target MME response .
The SGW of claim 6, wherein the SGW further comprises:

a second receiving module, configured to receive a resource processing request message sent by the packet data network gateway PGW;

And a forwarding module, configured to forward the resource processing request message to the source mobility management entity Source MME.
The SGW of claim 6, wherein the SGW further comprises:

The determining module is configured to determine whether the Source MME and the Target MME complete the UE resource switching according to the received handover request message and the resource processing temporary rejection message.
The SGW of claim 6, wherein the SGW further comprises:

The first response module is configured to respond to the resource processing failure message to the PGW if the source MME and the Target MME do not complete the UE resource handover.
The SGW of claim 6, wherein the SGW further comprises:

The second response module is configured to: when the source MME and the Target MME complete the UE resource handover, send a resource processing request message to the Target MME, and receive the resource processing success message of the Target MME response and complete the resource optimization processing. After that, the PGW responds to the resource processing success message.
An optimization system, including a Source MME, a Target MME, a PGW, and the SGW according to any one of claims 6 to 10.

The Source MME includes:

a third receiving module, configured to receive a resource processing request message forwarded by the SGW;

The third response module is configured to respond to the temporary rejection message to the SGW when the location of the user equipment UE changes.

The Target MME includes:

The first sending module is configured to send an MME switching request message to the SGW when the location of the user equipment UE changes;

And the fourth response module is configured to: when the source MME and the Target MM complete the UE resource switching, receive the resource processing request message sent by the SGW, and respond to the resource processing success message to the SGW after the resource processing is successful;

The PGW includes:

The sending module is configured to send a resource processing request message to the SGW.
The optimization system of claim 11 wherein said PGW further comprises:

a fourth receiving module, configured to receive a resource processing failure message of the SGW response when the source MME and the Target MME do not complete the UE resource switching;

The fifth receiving module is configured to: when the source MME and the target MME complete the UE resource switching, the SGW sends a resource processing request message to the Target MME, and after the SGW receives the resource processing success message of the Target MME response and completes the resource optimization process, A resource processing success message that receives the SGW response.