WO2011050528A1

WO2011050528A1 - Method, network device and network system for resources release

Info

Publication number: WO2011050528A1
Application number: PCT/CN2009/074704
Authority: WO
Inventors: 陈中平; 陈海永
Original assignee: 华为技术有限公司
Priority date: 2009-10-29
Filing date: 2009-10-29
Publication date: 2011-05-05
Also published as: CN102714878A; CN102714878B

Abstract

The embodiments of the present invention disclose a method, a network device and a network system for resources release. Wherein, the resources release method comprises: determining that the mobility management network element in target side can not establish the SGs association for the user equipment; transmitting the first release message to the network device so that the network device releases the SGs association which is established by the mobility management network element in source side and for the user equipment. The method, network device and network system for resources release disclosed by the embodiments of the present invention can release the invalid SGs association so as to avoid resources waste.

Description

Resource release method, network device and network system

Technical field

The present invention relates to the field of communications, and in particular, to a resource release method, a network device, and a network system. Background technique

The General Packet Radio Service (GPRS)/Universal Mobile Telecommunications System (UMTS) is a communication network architecture defined by the 3GPP organization, and the network communication architecture includes a radio access network (Radio Access Network, RAN) and the core network (Core Network, CN). The CN is logically divided into Circuit Switched Domain (CS) and Packet Switched Domain (PS). The CS domain mainly processes voice services, and the PS domain mainly processes packet services. The signaling plane control entity of the CS domain is a Mobile Switch Center (MSC), and the signaling plane control entity of the PS domain is a Serving GPRS Support Node (SGSN). The SGSN and the MSC can be connected through the Gs interface. . The SGSN is connected to the Base Station Controller (BSC) through the A interface, and is connected to the Radio Network Controller (RNC) through the Iu interface to provide services for the GPRS/UMTS data service. The core network of the Evolved Packet System (EPS) mainly includes three logical functional entities: Mobility Management Entity (MME), Serving Gateway (SGW), and PDN Gateway (PGW). The MME is responsible for NAS signaling and NAS signaling encryption, roaming, tracking, etc., assigns user temporary identity, security functions, etc., which corresponds to the control plane portion of the SGSN within the current UMTS system. The S-GW is responsible for the local mobility anchor and the mobility anchor inside the 3GPP system and the lawful interception related information; the P-GW is responsible for policy enforcement and charging and lawful interception related functions. Currently, the voice service of the operator runs in the circuit domain of GPRS/UMTS, in order to be in the EPS network. The existing voice service is reused in the network, so a method of connecting to the CS domain core network through the EPS network is proposed. The MME in the EPS network is connected to the MSC of the traditional CS core network through an SGs interface.

Under this architecture, when the UE is ready to initiate a MO Originating (MO, Mobile Originating) service, the UE needs to first go to the GPRS/UMTS network, select a 2G/3G cell to camp, and then start the MO service. When the MSC receives a terminal (MT, Mobile Terminated) service, the MSC sends a paging message to the MME through the SGs interface, and the MME pages the UE through the EPS network. After receiving the paging message, the UE needs to go to the first. In the GPRS/UMTS network, a 2G/3G cell is selected for camping, and then the MT service is subsequently processed. Therefore, the architecture and processing method can be used to return the CS network to CS Fallback (CSFB). In this architecture, if the UE completes the joint registration on the source side MME, the source side MME and the MSC establish an SGs association for the UE. When the handover occurs, the UE initiates a joint update request to the target MME. If the target MME does not support the CSFB, the target MME and the MSC cannot re-establish the SGs association for the UE, and the SGs are associated with the SGs established by the source MME for the UE. It will not be released. Since this SGs association is an invalid association, not releasing it in time will result in waste of resources. However, there is no mechanism in the prior art to release the association of the SGs. Summary of the invention

The embodiment of the invention provides a method for releasing a resource, a network device and a network system, and implements release of an invalid SGs association.

A resource release method includes:

Determining that the target-side mobility management network element cannot establish an SGs association for the user equipment;

Sending a first release message to the network device, so that the network device releases the SGs association established by the source side mobility management network element for the user equipment.

A resource release method includes:

Receiving a first release message sent by the network element in the target-side mobility tube, where the first release message is sent Contains instructions

And releasing, according to the indication information, an SGs association established by the source-side mobility management network element for the user equipment. A method of resource release, including:

Receiving a cancel location message sent by the HSS/HLR;

Determining that the source side mobility management network element establishes an SGs association for the user equipment;

And sending a detachment indication message to the mobile switching center, so that the mobile switching center releases the SGs association established by the source-side mobility management network element for the user equipment.

A target-side mobility management network element includes:

a determining unit, configured to determine that the target side mobility management network element cannot establish an SGs association for the user equipment; when the device establishes the SGs association, the device sends a first release message to the network device, so that the network device releases the source side mobility management network element An SGs association established for the user equipment.

A network device, including:

a receiving unit, configured to receive a first release message sent by a network element in the target-side mobility tube, where the first release message includes indication information;

And a releasing unit, configured to release, according to the indication information received in the receiving unit, an SGs association established by the source-side mobility management network element for the user equipment.

A network system includes a target side mobility management network element and a network device, where

The target-side mobility management network element is configured to: when the target-side mobility management network element is unable to establish an SGs association for the user equipment, send a first release message to the network device, where the first release message includes Indication information;

And the network device is configured to receive the first release message sent by the target-side mobility management network element, and release the SGs association established by the source-side mobility management network element for the user equipment according to the indication information.

A network system, including:

Home subscriber server/home location register, used to determine the mobility pipe serving the user equipment When the network element changes, the cancel location message is sent to the source side mobility management network element;

a source-side mobility management network element, configured to receive a cancel location message sent by the home subscriber server/home location register, and determine that the source mobility management network element performs mobility switching for the user equipment when the SGs association is established. The center sends a separation indication message, so that the mobile switching center releases the SGs association established by the source side mobility management network element for the user equipment. DRAWINGS

FIG. 1 is a first schematic diagram of a resource release method according to an embodiment of the present invention;

2A is a second schematic diagram of a resource release method according to an embodiment of the present invention;

2B is a third schematic diagram of a resource release method according to an embodiment of the present invention;

FIG. 3 is a fourth schematic diagram of a resource release method according to an embodiment of the present invention;

4 is a fifth schematic diagram of a resource release method according to an embodiment of the present invention;

FIG. 5 is a sixth schematic diagram of a resource release method according to an embodiment of the present invention;

FIG. 6 is a seventh schematic diagram of a resource release method according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a target side mobility management network element according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a network device according to an embodiment of the present invention; FIG.

FIG. 9 is a first schematic diagram of a network system according to an embodiment of the present invention; FIG.

FIG. 10 is a second schematic diagram of a network system according to an embodiment of the present invention. detailed description

A resource release method, a network device, and a network system according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of the present invention provides a resource release method, including: establishing an SGs association;

The reasons why the target-side mobility management NE cannot establish an SGs association for the user equipment include: The target side mobility management network element does not support the circuit domain service returning to the CSFB; or the target side mobility management network element supports the CSFB, but the establishment of the SGs association fails for the user equipment.

The target-side mobility management network element sends a first release message to the network device, so that the network device releases the SGs association established by the source-side mobility management network element for the user equipment.

In all embodiments of the present invention, the network device may be a Home Subscriber Server (HSS)/Home Location Register (HLR), and the network device may also be a source-side mobility management network element.

The sending, by the target-side mobility management network element, the first release message to the network device includes: sending, by the target-side mobility management network element, the first release message to the network device when the update type of the user equipment is a joint update; or

When the source-side mobility management network element acquires the SGs association for the user equipment, the source-side mobility management network element sends a first release message to the network device.

The acquiring, by the target-side mobility management network element, the source-side mobility management network element to establish an SGs association for the user equipment includes:

The target-side mobility management network element receives the source-side mobility management network element on the source-side mobility management network element to establish an SGs association message for the user equipment, and obtains the source-side mobility management from the message. The network element establishes an SGs association for the user equipment; or

The target-side mobility management network element obtains the source-side mobility management network element from the update request message sent by the user equipment, and establishes an SGs association for the user equipment, where the update request message may be a joint tracking area update request message. , a joint location area update request message or a tracking area update request message, and the like.

The first release message sent by the target-side mobility management network element to the source-side mobility management network element includes indication information, where the indication information indicates that the target-side mobility management network element cannot be used. The device establishes an SGs association.

Further, the source-side mobility management network element determines, according to the received indication information, that the target-side mobility management network element cannot establish an SGs association for the user equipment, and sends a second release message to the mobile switching center to release the source-side mobile The SGs association established by the STP for the user equipment, and the mobile switching center migrates the state of the SGs association to the "SGs empty" state.

Further, the indication form of the indication information may include:

The first release message includes a "CSFB Supported" cell, and the different value of the cell indicates whether the target-side mobility management network element can establish an SGs association for the user equipment; or the first release The message includes a "CSFB Supported" cell, which indicates that the target side mobility management network element can establish an SGs association for the user equipment; the first release message includes a "CSFB not Supported" cell, indicating the target side mobility management network element. Unable to establish SGs association for user equipment; or

The first release message includes a "CSFB Supported" cell, which indicates that the target side mobility management network element can establish an SGs association for the user equipment; the first release message does not include a "CSFB Supported" cell, indicating that the target side The mobility management network element cannot establish CGs associations for user equipment.

The first release message (location update request message) sent by the target-side mobility management network element to the HSS/HLR includes indication information, where the indication information indicates that the HSS/HLR sends the second separated message to the mobile switching center, the HSS/HLR. Sending a second release message to the mobile switching center according to the indication information, and releasing the SGs association established by the source-side mobility management network element for the user equipment.

Further, the indication form of the indication information may include: the "ULR Flags" cell in the location update request message Update Location Request may be used to indicate whether the HSS/HLR sends a cancel location message to the MSC. For example: If the "ULR Flags" cell is included

The "MSC-Derigistration-indication" flag indicates that the HSS/HLR sends a Cancel Location message to the MSC. If the ULR Flags "cell does not contain the "MSC-Derigistration-indication" flag, the HSS/HLR is not instructed to send a Cancel Location message to MSC and so on.

It should be noted that in all embodiments of the present invention, the mobility management network element may be an MME, and It can be SGSN or the like.

It should be noted that, in all embodiments of the present invention, the first release message sent by the target-side mobility management network element to the source-side mobility management network element may be a separate message, and the target-side mobility management network element is directed to the HSS/HLR. The first release message sent may be a location update request message or the like. The second release message sent by the source-side mobility management network element to the MSC may be a separation indication message, such as

SGs AP-IMSI-DETACH-INDIC ΑΉΟΝ message or SGs AP-EPS-DETACH-INDICATION message, etc.; the second release message sent by the HSS/HLR to the MSC may be a cancel location message or the like.

It should be noted that the HSS and the HLR may be combined or set in the network system. The merge setting is generally referred to as HSS/HLR. In all embodiments of the present invention, the HSS/HLR is collectively referred to as HSS/HLR. The mobile switching center and the Visitor Location Register (VLR) may also be combined or may exist independently in the network system. When the MSC and the VLR are combined, they are usually referred to as MSC/VLR, in all embodiments of the present invention. For the sake of convenience, the uniformity will be called MSC.

With the method provided by the embodiment of the present invention, when the mobility management network element of the serving UE is changed, and the changed target-side mobility management network element cannot establish an SGs association for the UE, the target-side mobility management network element can initiate release in time. The source-side mobility management network element is a SGs association process established by the UE, and the source-side mobility management network element is associated with the SGs association established by the UE. Since the SGs association is an invalid association at this time, timely release can avoid resources. waste. Further, due to the existence of the invalid association, the network side may mistakenly believe that the CSFB service can be performed, so that the MSC can notify the source-side mobility management network element to page the UE according to the invalid SGs association, resulting in paging failure.

Referring to FIG. 2A, another embodiment of the present invention provides a resource release method, including:

202. The network device receives a first release message sent by the target mobility management network element, where the first release message includes indication information.

In the embodiment of the present invention, the network device may be a home location register/home subscriber server, or may be a source-side mobility management network element. The source-side mobility management network element receives the first release message sent by the target-side mobility management network element, where the first release message includes indication information, indicating the target, when the network device is the source-side mobility management network element. The side mobility management network element cannot establish an SGs association for the user equipment.

When the network device is the home location register/home subscriber server, the home location register/home subscriber server receives the first release message sent by the target mobility management network element, where the first release message may be a location update request message, the first The release message includes indication information indicating that the home location register/home subscriber server sends a second release message to the mobile switching center.

When the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment, the indication form of the indication information may include:

The target-side mobility management network element cannot establish an SGs association for the user equipment, including: the target-side mobility management network element does not support the circuit domain service returning to the CSFB; or

The target-side mobility management network element supports CSFB, but fails to establish an SGs association for the user equipment.

When the indication information indicates that the home location register/home subscriber server sends the second release message to the mobile switching center, the indication form of the indication information may include: "ULR Flags" cells in the location update request message Update Location Request may be utilized. Indicates whether the HSS/HLR sends a Cancel Location message to the MSC. Such as: "ULR Flags" are included in the cell The "MSC-Derigistration-indication" flag indicates that the HSS/HLR sends a Cancel Location message to the MSC; if the "ULR Flags" cell in the Location Update Request message does not contain

The "MSC-Derigistration-indication" flag does not instruct the HSS/HLR to send a Cancel Location message to the MSC.

In all embodiments of the present invention, the mobility management network element may be an MME, an SGSN, or the like. 204. The network device releases, according to the indication information, an SGs association established by the source-side mobility management network element for the user equipment.

When the network device is the source-side mobility management network element, the source-side mobility management network element acquires, according to the indication information in the received first release message, that the target-side mobility management network element cannot establish an SGs association for the user equipment. Then, the source-side mobility tube network element sends a second release message to the mobile switching center, and releases the SGs association established by the network element in the source-side mobility tube for the user equipment.

When the network device is the home location register/home subscriber server, the home location register/home subscriber server sends a cancel location message to the mobile switching center according to the indication information in the received first release message, releasing the source-side mobility pipe network. The SGs association established by the user device.

The mobile switching center releases the SGs association, including: the mobile switching center migrates the state of the SGs association to the "SGs empty" state.

According to the method provided by the embodiment of the present invention, the source-side mobility management network element or the home location register/home subscriber server may delete the SGs association established by the source device for the user equipment according to the indication of the target-side mobility management network element, thereby avoiding The resource caused by the existence of the SGs association is wasted, and since the SGs association is an invalid association, the failure of paging the UE is also avoided.

Referring to FIG. 2B, another embodiment of the present invention provides a resource release method, including:

S100. The source-side mobility management network element receives the cancel location message sent by the HSS/HLR. The HSS sends the cancel location to the source MME when the MME serving the UE changes.

Canncle Location message.

SGs association; S300. The source-side mobility management network element sends a separation indication message to the mobile switching center, so that the mobile switching center releases the SGs association established by the source-side mobility management network element for the user equipment.

After receiving the separation indication message sent by the source-side mobility management network element, the mobile switching center determines whether the identifier of the received source-side mobility management network element is consistent with the identifier of the saved mobility management network element, and if not, releases the identifier. The source-side mobility management network element is an SGs association established by the user equipment.

The mobile switching center releases the SGs association, including: the mobile switching center migrates the state of the SGs association to the "SGs empty".

According to the method provided by the embodiment of the present invention, the source-side mobility management network element can initiate the process of releasing the association of the SGs regardless of whether the target-side mobility management network element can create an SGs association for the UE, thereby avoiding resource waste.

It should be noted that the embodiments corresponding to FIG. 1 , FIG. 2A and FIG. 2B also have the possibility of being combined with each other, and can be directly or indirectly combined to realize the release of the source-side mobility management network element for the UE. The association of SGs avoids the waste of resources.

The embodiment of the present invention further provides a method for releasing a resource. After the UE completes the joint registration on the source MME, the source side MME and the MSC establish an SGs association for the UE. When the MME serving the UE changes, the changed target side is performed. The MME is unable to establish an SGs association for the UE, and the target MME notifies the source MME to release the SGs association established by the source side for the UE. The method includes:

Referring to FIG. 3, step 301 to step 305 are processes in which the UE completes joint registration on the source side MME and establishes association of the SGs, including:

301. The UE sends an update request message, such as a tracking area update request message TAU Request, to the source MME. The update type of the tracking area update request message may be a combined tracking area/Location Area Update Request or a combined Tracking Area, or may be a separate tracking area/separate location area update request. Or tracking area update (TA /LAupdating Request). . 302. After the source-side MME receives the update request message initiated by the UE, if the source-side MME supports the CSFB, the source-side MME sends a location update request message to the MSC, where the message may include the location area identifier of the UE. , LAI), International Mobile Subscriber Identity (IMSI), address information of the source side MME, location update type, and the like.

303. The MSC performs a circuit domain location update process. Location Update in CS Domain. The MSC interacts with the HSS to complete the circuit domain location update.

304. The MSC sends a location update accept message to the source MME. The message may include Temporary Mobile Subscriber Identity (TMSI) information allocated by the MSC to the UE, where the TMSI may be used to identify the UE.

305. The source side MME receives the update accept message, and returns an update accept message to the UE. At this point, the UE completes the joint registration on the source side MME, and the source side MME and the MSC establish the SGs association of the UE on the source side, and the UE can perform the CSFB service in the source network.

Referring to FIG. 4, when the location area of the UE changes, the MME serving the UE becomes the target MME, and the target MME determines that the SGs association cannot be established for the UE, and the target MME may send the indication information to the source MME. The process of causing the source side MME to initiate the release of the SGs association includes:

401. The UE sends a tracking area update request message TAU Request to the target MME, where the tracking area update request message includes an update type Update Type, where the update type may be a joint tracking area/location area update request (combined Tracking Area/Location) Area Update Request or a combined Tracking Area ), , can also be a separate tracking area/separate location area update request or tracking area update (TA /LAupdating Request).

402. The target MME sends a context request message Context Request to the source MME.

403. The source side MME sends a context response message to the target side MME. Context Response„

404. The target side MME sends a context confirmation message Context Ack to the source side MME. Further, the context confirmation message may include indication information, where the indication information is used to indicate whether the UE can establish an SGs association on the target side, where the indication information may be expressed by:

A. If the context confirmation message includes a "CSFB Supported" cell, the UE may indicate whether the SGs association can be established on the target side according to different values of the cell. For example, if the value of the cell is 1, the target side MME supports CSFB. The SGs association may be established for the UE; the value of the cell is 0, indicating that the target MME does not support CSFB, and the SGs association cannot be established for the UE, and the meaning of the cell value and the meaning of the different values may be arbitrarily determined;

B. If the context confirmation message includes a "CSFB Supported" cell, it indicates that the target side MME supports CSFB, and may establish an SGs association for the UE; if the context confirmation message includes a "CSFB not Supported" cell, it indicates that the target side The MME does not support CSFB, cannot establish SGs association for the UE, etc.; or

C. If the Context Confirmation message includes a "CSFB Supported" cell, it indicates that the target side MME supports CSFB, and may establish an SGs association for the UE; if the Context Confirmation message does not include a CSFB Supported "cell, the target side MME is indicated. CSFB is not supported and SGs association cannot be established for the UE.

Further, the target MME may provide the indication information to the source MME in each context confirmation message, and notify the source MME whether the target MME supports CSFB information; or

The target MME may selectively notify the source side MME whether the target MME supports the CSFB, including:

1. The update type sent by the UE to the target MME indicates that the target MME sends the indication information to the source MME to indicate whether the target MME supports CSFB, or the location MME sends the indication information to the source MME.

2. When the MME obtains the SGs association information for the UE, the MME sends the indication information to the source MME to indicate whether the target MME supports CSFB. The method for the target MME to obtain the SGs association information that the source MME has established for the UE includes:

(1) The source MME actively reports to the target MME whether the SGs association has been established. For example, the source MME sends a context response message to the target MME. The Context Response includes a cell indicating whether the target MME provides the source MME with the source MME. Establish information related to SGs. The premise that the source MME has established the SGs association with the target MME may be that the source MME has established an SGs association for the UE. For example, the SGs association information SGs association in the source MME is set to SGs-ASSOCIATED; or

(2) The target MME learns that the UE has established the SGs association by using the UE related context acquired from the source MME. Specifically, if the UE related context includes information related to establishing an SGs association, for example, MSC information, TIMSI information. The SGs association information (the SGs association is set to SGs-ASSOCIATION) or the like, the target side MME can confirm that the UE has established the SGs association;

(3) The target MME obtains the SGs association that the UE has established according to the information provided by the UE. For example, the tracking area update request message sent by the UE to the target MME includes whether the source MME has established an SGs association for the UE, and the tracking area update request message is sent. It may be a joint tracking area or a combined location area update request, or it may be a separate tracking area or location area update request.

In this step, the reason that the target side MME cannot establish the SGs association for the UE may be that the target side MME does not support CSFB.

Optionally, 405, the target MME determines that the SGs association cannot be established for the UE, sends a separate message to the source MME, and notifies the source MME to perform a related process for releasing the association of the SGs, where the split message includes indication information indicating the target MME. Unable to establish SGs association for UE. The form of the indication information and the timing of transmitting the indication information may refer to the description in step 404.

In this step, the reason that the target MME cannot establish the SGs association for the UE may be: the target side MME supports the CSFB, but the SGs association fails to be established for the UE; or the target side does not support the CSFB function. 406. After receiving the detach message, the source MME is configured to: according to the indication information included in the detachment message, or after receiving the Context Confirmation message, the source MME confirms the indication information included in the message according to the context; When the association is performed, the source side MME sends a separation indication message to the MSC, where the separation indication message may be:

A. If the detachment indication message is an SGsAP-IMSI-DETACH-INDICATION message, after receiving the detachment indication message, the MSC performs an IMSI Datach process to separate the UE from the CS domain, and the source side resource is released; or

B. If the separation indication message is an SGsAP-EPS-DETACH-INDICATION message, after receiving the separation indication message, the MSC releases the SGs association. For example, the MSC migrates the state of the "SGs association" to "SGs empty ( SGs-NULL )" status. Further, if the implicit separation timer is in a stop state, the implicit separation timer may be restarted, the timer expires to separate the UE from the CS domain, and the source side resource is released. If the implicit separation timer is in the startup state, Do not do anything.

407. The MSC sends a separation indication acknowledgement message to the source side MME to complete the release of the association of the SGs. In the method provided by the embodiment of the present invention, when the target MME is unable to establish an SGs association for the UE, the target MME notifies the source MME to release the SGs association, which can avoid waste of network resources and avoid invalid SGs association. Paging the UE failed. Referring to FIG. 5, another embodiment of the present invention provides a method for releasing a resource. After the UE completes the joint registration on the source MME, the source MME and the MSC establish an SGs association for the UE, and when the MME serving the UE changes. The changed target MME cannot establish an SGs association for the UE, and the target MME notifies the HSS/HLR to release the SGs association established by the source side for the UE. The method includes:

The process in which the source side MME establishes an SGs association for the UE refers to steps 301 to 305.

When the location area of the UE changes, the MME serving the UE becomes the target MME, and when the target MME determines that the SGs association cannot be established for the UE, the indication information is sent to the HSS/HLR. Instructing the HSS/HLR to initiate a process for separating the association of the SGs, including:

501. The UE sends a tracking area update request message TAU Request to the target side MME, where the tracking area update request message includes an update type Update Type, and the update type may be a combined 3 track area/joined location area update request (combined Tracking Area/Location Area Update Request), can also be a separate tracking area / separate location area update request or tracking area update (TA / LAupdating Request).

502. The target MME sends a context request message to the source MME, a Context Request.

503. The source side MME sends a context response message to the target MME. Context Response;

504, the target side MME sends a context confirmation message Context Ack to the source side MME;

505. The target side MME sends a location update request message to the Update Location Request.

The location update request message includes an identifier of the MME (identity), an IMSI of the UE, an update type Update Type, and capability information of the target side MME, and the HSS/HLR. Further, if the target MME is unable to establish an SGs association for the UE, the location update request message includes indication information, indicating that the HSS/HLR sends a cancel location message to the MSC, and the HSS/HLR sends the cancel location information Cancle Location according to the indication information. The MSC releases the SGs association established by the source side MME for the UE.

Further, the indication form of the indication information may include: the "ULR Flags" cell in the location update request message Update Location Request may be used to indicate whether the HSS/HLR sends the cancel location message to the MSC. For example, when the "MSC-Derigistration-indication" flag is included in the "ULR Flags" cell, the HSS/HLR is instructed to send a Cancel Location message to the MSC; if the "ULR Flags" cell does not contain the "MSC-Derigistration-indication" flag At the time, the HSS/HLR is not instructed to send a cancel location message to the MSC or the like.

Further, if the target MME cannot establish an SGs association for the UE, it may always instruct the HSS/HLR to send a Cancel Location message to the MSC, or the target MME may selectively instruct the HSS/HLR to send a Cancel Location message ( Cancle Location) to the MSC.

The target MME may selectively indicate that the HSS/HLR sends a Cancel Location message to the MSC, including: A. When the update type in the step 501 is a joint tracking area/location area update request, the target MME sends an indication message to the HSS/HLR, instructing the HSS/HLR to send a Cancle Location to the MSC; or

B. In step 503, the target MME sends the indication information to the HSS/HLR to indicate that the HSS/HLR sends the Cancle Location to the MSC when the MME has established the SGs association for the UE.

The manner in which the target MME learns that the source MME has established an SGs association for the UE may include:

(1) The target side learns from the UE related context that is obtained by the source MME that the UE has established an SGs association. Specifically, if the UE related context includes information related to establishing an SGs association, for example, MSC information, TMSI information, SGs association information (SGs association is set to

SGs-ASSOCIATED), etc., the target side MME can confirm that the UE has established an SGs association; or

(2) The source MME actively reports the SGs association information for the UE to the target MME. For example, the source MME sends a context response message to the target MME. The Context Response includes a cell indicating the target MME to the source MME. Provides information on whether SGs can be associated. The MME may have established the SGs association for the UE by the source MME, for example, the SGs association information SGs association in the source MME is set to SGs-ASSOCIATED; or

(3) The UE sends the SGs association information for the UE to the target side MME, and the tracking area update request message sent by the UE to the target MME includes whether the source MME has established an SGs association for the UE, and the tracking area is updated. The request message may be a joint tracking area or a combined location area update request, or may be a separate tracking area or location area update request.

In the embodiment of the present invention, if the target MME cannot establish an SGs association for the UE, the HSS/HLR needs to be instructed to send the Cancel Location information to the MSC.

The reason that the target side MME cannot establish an SGs association for the UE may be that the target side MME does not Support CSFB, or the target side MME supports CSFB, but fails to establish SGs for the UE. 506. The HSS/HLR replies to the location update acknowledgement message to the target MME.

507. The HSS/HLR sends a cancel location cancel Location message to the MSC, and the MSC receives the message and releases the SGs association. For example, the MSC migrates the state of the "SGs association" to the "SGs-NULL" state; further, if implicitly separated The timer is in the stop state, and the implicit separation timer can be restarted. The timer expires to separate the UE from the CS domain, and the source side resources are released. If the implicit separation timer is in the startup state, no processing is performed.

The address or identifier of the MSC serving the UE is stored in the HSS/HLR.

The HSS/HLR can address the UE serving according to the saved MSC address or identity information.

MSC.

508. The MSC replies to cancel the location confirmation. The cancel Location ack message is sent to the HSS/HLR, and the release of the SGs association is completed.

The method provided by the embodiment of the present invention, when the target MME is unable to establish an SGs association for the UE, the target MME notifies the HSS/HLR to release the SGs association, which can avoid waste of network resources and avoid the invalid SGs association. Paging the UE failed.

The embodiment of the present invention further provides a resource release method, including:

The process of establishing an SGs association for the UE on the source side refers to steps 301 to 305.

601. The UE sends a tracking area update request message TAU Request to the target MME, where the tracking area update request message includes an update type Update Type, and the update type may be a combined 3 track area/joined location area update request (combined Tracking Area/Location Area Update Request), can also be a separate tracking area / separate location area update request or tracking area update (TA / LAupdating Request).

602. The target MME sends a context request message Context Request to the source MME.

603, the source side MME sends a context response message to the target side MME Context Response;

604, the target side MME sends a context confirmation message Context Ack to the source side MME;

605. The target side MME sends a location update request message to the Update Location Request. The HSS/HLR, the location update request message may include an identifier (Identity, ID) of the MME, and UE identification information IMSI and the like.

606. The HSS/HLR replies to the location update response message to the target MME.

607. The MME that is determined by the HSS/HLR to be served by the UE is changed. If the ID information of the MME obtained by the location update request message in step 605 is inconsistent with the saved MME ID, the MME that is determined to be serving the UE occurs. The change, the HSS/HLR replaces the previously saved MME ID information according to the received MME ID information, that is, replaces the ID information of the source side MME with the ID information of the target side MME. The HSS/HLR sends a Cancel Location message to the source side MME, where the HSS/HLR can address the source side MME according to the source side MME ID.

608. The source side MME replies to cancel the location confirmation Cancel Location ack message to the HSS/HLR.

609. The source MME receives the Cancel Location message sent by the HSS/HLR. If the source MME confirms that the SGs association information has been established for the UE, for example, the source MME confirms that the status of the "SGs association" related to the UE is not "SGs-NULL". The source MME sends a separation indication message to the MSC associated with the SGs of the UE.

Further, the source MME sends a detachment indication message to the MSC, where the message may include the identity information of the UE, such as the IMSI, and the MME may also include the MME identity information related to the SGs, such as the MME name. The separation indication message may be an SGsAP-EPS-DETACH-INDICATION message. The reason for the release can be indicated as "MME initiated detach from EPS services".

610. After receiving the detachment indication message, the MSC releases the SGs association established by the MME for the UE according to the MME identity information included in the message, and the MSC sends a separation indication acknowledgement message to the source MME to complete the release of the association of the source SGs.

If the MME identity information is consistent with the MME identity information currently saved by the MSC, the MSC establishes an SGs association with the MME for the UE, and the MSC migrates the state of the "SGs association" to the "SGs-NULL" state, further If the implicit separation timer is in a stopped state, the implicit separation timer may be restarted, and the timer expires to separate the UE from the CS domain. The side resources are released, and if the implicit separation timer is in the startup state, no processing is performed. If the MME identity information is inconsistent with the MME identity information that the MSC currently holds for the UE, the association between the MSC and the MME established by the MME for the UE has been released. For example, the MSC has established an SGs association with the other MME for the UE. The MSC will maintain the current "SGs association" status, ie, keep the existing SGs related context unchanged.

The method provided by the embodiment of the present invention, when the HSS/HLR learns that the mobility management network element served by the UE changes, sends a cancel location message to the source side MME, and the source MME determines the source side MME after receiving the cancel location message. If the SGs association is established for the UE, the process of releasing the SGs association is initiated, and the SGs association is released. The method provided by the embodiment of the present invention is used to establish the SGs association for the UE, as long as the source MME determines to establish the UE. The SGs association can initiate the process of releasing the association of the SGs, which can avoid waste of network resources and avoid the failure of the paging UE due to the existence of invalid SGs association. Referring to FIG. 7, an embodiment of the present invention provides a target-side mobility management network element, including: a determining unit 702, configured to determine that a target-side mobility management network element cannot establish an SGs association for a user equipment; And sending, by the network device, a first release message, so that the network device releases the SGs association established by the source-side mobility management network element for the user equipment.

In another embodiment of the present invention, the determining unit 702 determines that the target side mobility management network element cannot establish an SGs association for the user equipment, including:

CSFB; or the user device failed to establish an SGs association.

In another embodiment of the present invention, the target side mobility management network element further includes a first obtaining unit, configured to acquire an update type of the user equipment as a joint update, and a sending unit 704, configured to: when the first acquiring unit acquires an update type of the user equipment as a joint update, to the network device Sending a first release message;

Or

a second acquiring unit, configured to acquire the source-side mobility management network element to establish an SGs association for the user equipment;

The sending unit 704 is configured to send, by the second acquiring unit, the first release message to the network device when the source-side mobility management network element establishes an SGs association for the user equipment.

In another embodiment of the present invention, the second acquiring unit is configured to receive, by the source-side mobility management network element, the source-side mobility management network element, to establish an SGs association message for the user equipment, Obtaining, by the message, the source-side mobility management network element establishes an SGs association for the user equipment; or

The second obtaining unit is configured to be used by the user equipment obtained from the source side mobility management network element

The second obtaining unit is configured to obtain, by using the update request sent by the user equipment, the source-side mobility management network element to establish an SGs association for the user equipment.

In another embodiment of the present invention, the first release message sent by the sending unit 604 includes indication information, where the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment. ; or

When the first release message sent by the sending unit 604 includes indication information, the indication information instructs the HSS/HLR to send a second release message to the mobile switching center.

The target-side mobility management network element is a name of the mobility management network element in different systems, and may also be called a source-side mobility management network element in another system. The target-side mobility management network element may be an MME, an SGSN, or the like. When the SGs are associated, the first release message is sent to the network device, and the SGs association established by the source-side mobility management network element for the user equipment is released, thereby avoiding waste of resources.

Referring to FIG. 8, an embodiment of the present invention provides a network device, including:

The receiving unit 802 is configured to receive a first release message sent by the network element in the target-side mobility tube, where the first release message includes indication information;

The releasing unit 804 is configured to release, according to the indication information received in the receiving unit 802, the SGs association established by the source-side mobility management network element for the user equipment.

In another embodiment of the present invention, the network device further includes:

a determining unit, configured to: when the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment, determine, according to the indication information, that the target-side mobility management network element cannot establish an SGs for the user equipment When the user equipment establishes the SGs association, the second release message is sent to the mobile switching center, and the SGs association established by the source-side mobility management network element for the user equipment is released.

In another embodiment of the present invention, the releasing unit 804 is configured to: when the indication information indicates that the HSS/HLR sends the second release message to the mobile switching center, send the second to the mobile switching center according to the indication information. The message is released, and the SGs association established by the source-side mobility management network element for the user equipment is released.

The network device provided in this embodiment may be a mobility management network element, or may be an HSS/HLR, and the mobility management network element may be an MME, an SGSN, or the like.

The network device provided by the embodiment of the present invention may receive the detachment message sent by the target-side mobility management network element, and release the SGs association established by the source-side mobility management network element for the user equipment according to the indication information included in the detachment message, thereby avoiding resources. waste.

Referring to FIG. 9, an embodiment of the present invention provides a network system, including a target side mobility management network element 902 and a network device 904, where

The target-side mobility management network element 902 is configured to determine the target-side mobility management network element. When the 902 is unable to establish an SGs association for the user equipment, the first release message is sent to the network device 904, where the first release message includes indication information;

The network device 904 is configured to receive the first release message sent by the target-side mobility management network element 902, and release the SGs association established by the source-side mobility management network element for the user equipment according to the indication information.

In another embodiment of the present invention, when the network device 904 is a source-side mobility management network element, the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment;

The source-side mobility management network element is configured to determine, according to the indication information, that the target-side mobility management network element cannot establish an SGs association for the user equipment, and send a second release message to the mobile switching center to release the source-side mobility. The SGs association established by the management NE for the user equipment.

In another embodiment of the present invention, when the network device 904 is an HSS/HLR, the indication information indicates that the HSS/HLR sends a second release message to the mobile switching center;

The HSS/HLR is configured to send a second release message to the mobile switching center according to the indication information, and release the SGs association established by the source-side mobility management network element for the user equipment.

In the network system provided by the embodiment of the present invention, when the target-side mobility management network element determines that the SGs association cannot be established for the user equipment, the first release message is sent to the network device, and the network device receives the indication information included in the first release message. The SGs association established by the source-side mobility management network element for the user equipment is released, thereby avoiding waste of resources.

Referring to FIG. 10, an embodiment of the present invention provides a network system, including: a home subscriber server/home location register 1002 and a source side mobility management network element 1004.

The home subscriber server/home location register 1002 is configured to: when it is determined that the mobility management network element serving the user equipment changes, send a cancel location message to the source side mobility management network element 1004; and the source side mobility management network element 1004, After receiving the cancel location message sent by the home subscriber server/home location register 1002, determining that the source mobility management network element 1004 establishes an SGs association for the user equipment, sending a separation indication message to the mobile switching center, Move the move The mobile switching center releases the SGs association established by the source-side mobility management network element for the user equipment.

In another embodiment of the present invention, the network system may further include:

a mobile switching center, configured to receive a separation indication message sent by the source-side mobility management network element, and determine that the received source-side mobility management network element has a different identifier from the saved mobility management network element, releasing the The source side mobility management network element is an SGs association established by the user equipment.

In another embodiment of the present invention, the mobile switching center is further configured to migrate the state of the SGs association to "SGs empty".

In the network system provided by the embodiment of the present invention, after receiving the cancel location message sent by the home subscriber server/home location register, the source-side mobility management network element determines to release the SGs association when the user equipment establishes the SGs association. The SGs association established by the source-side mobility management network element for the user equipment may be released regardless of whether the target-side mobility management network element can establish an SGs association.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk. It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Claim

A resource release method, comprising:

The resource release method according to claim 1, wherein determining that the target-side mobility management network element cannot establish an SGs association for the user equipment includes:

Determining that the target-side mobility management network element does not support the circuit domain service returning to the CSFB; or determining that the target-side mobility management network element supports CSFB, but establishing an SGs association failure for the user equipment.

The method for releasing a resource according to claim 1, wherein the sending the first release message to the network device comprises:

And acquiring, when the update type of the user equipment is a joint update, sending a first release message to the network device; or

When the source-side mobility management network element obtains the SGs association for the user equipment, the first release message is sent to the network device.

The method for releasing a resource according to claim 3, wherein the obtaining the source-side mobility management network element to establish an SGs association for the user equipment comprises: establishing a message associated with an SGs, from the Obtaining, by the message, the source-side mobility management network element establishes an SGs association for the user equipment; or

Acquiring the source-side mobility management network element from the context of the user equipment acquired by the source-side mobility management network element to establish an SGs association for the user equipment; or

Acquiring the source-side mobility management network element from the update request sent by the user equipment establishes an SGs association for the user equipment.

The resource release method according to any one of claims 1 to 4, wherein when the network is configured In the case of the source-side mobility management network element, the first release message includes indication information, where the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment; or

When the network device is the home subscriber server HSS/home location register HLR, the first release message includes indication information, and the indication information instructs the HSS/HLR to send a second release message to the mobile switching center.

The resource release method according to claim 5, further comprising:

When the network device is a source-side mobility management network element, the source-side mobility management network element determines that the target-side mobility management network element cannot establish an SGs association for the user equipment according to the received indication information. Sending a second release message to the mobile switching center, and releasing the SGs association established by the source-side mobility management network element for the user equipment;

Or

When the network device is an HSS/HLR, the HSS/HLR sends a second release message to the mobile switching center according to the received indication information, and releases the SGs association established by the source-side mobility management network element for the user equipment.

The resource release method according to claim 5, wherein the SGs association established by the network device to release the source-side mobility management network element for the user equipment includes:

And causing the network device to notify the mobile switching center to release the SGs association established by the source-side mobility management network element for the user equipment, and the mobile switching center migrates the state of the SGs association to “SGs empty”.

8. A resource release method, comprising:

Receiving a first release message sent by the network element in the target-side mobility tube, where the first release message includes indication information;

And releasing, according to the indication information, an SGs association established by the source-side mobility management network element for the user equipment.

The resource release method according to claim 8, wherein the SGs association established by the source-side mobility management network element for the user equipment according to the indication information includes:

When the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment, determining, according to the indication information, that the target-side mobility management network element cannot be established for the user equipment Corresponding to the SGs, sending a second release message to the mobile switching center, releasing the SGs association established by the source-side mobility management network element for the user equipment; or

When the indication information indicates that the HSS/HLR sends the second release message to the mobile switching center, the second release message is sent to the mobile switching center according to the indication information, and the source-side mobility management network element is released for the user equipment. SGs are associated.

The resource release method according to claim 9, wherein the target-side mobility management network element cannot establish an SGs association for the user equipment, including:

The target side mobility management network element does not support the circuit domain service returning to the CSFB; or

The target side mobility management network element supports CSFB, but the establishment of the SGs association for the user equipment fails.

The resource release method according to any one of claims 8 to 10, wherein the SGs association established by the source-side mobility management network element for the user equipment according to the indication information includes:

And notifying the mobile switching center to release the SGs association established by the source-side mobility management network element for the user equipment according to the indication information, where the mobile switching center migrates the state associated with the SGs to “SGs empty”.

12. A resource release method, comprising:

Receiving a cancel location message sent by the HSS/HLR;

The resource release method according to claim 12, wherein the SGs association established by the mobile switching center to release the source-side mobility management network element as a user equipment comprises:

After the mobile switching center receives the separation indication message, and determines that the identifier of the received source-side mobility management network element is consistent with the saved mobility management network element identifier, releasing the source-side mobility management The SGs association established by the NE for the user equipment.

The resource release method according to claim 12 or 13, wherein the SGs association established by the mobile switching center to release the source-side mobility management network element as a user equipment comprises: So that the mobile switching center migrates the state of the SGs association to "SGs empty".

15. A target-side mobility management network element, comprising:

a determining unit, configured to determine that the target side mobility management network element cannot establish an SGs association for the user equipment; when the SGs association is established, the first release message is sent to the network device, so that the network device releases the source side mobility management network element An SGs association established for the user equipment.

The target-side mobility management network element according to claim 15, wherein the target-side mobility management network element further includes

a first acquiring unit, configured to acquire an update type of the user equipment as a joint update;

The sending unit is configured to: when the first acquiring unit acquires that the update type of the user equipment is a joint update, send a first release message to the source network device;

Or

The sending unit is configured to send, by the second acquiring unit, the first release message to the network device when the source-side mobility management network element establishes an SGs association for the user equipment.

17. The target side mobility management network element of claim 16 wherein:

The second obtaining unit is configured to receive, by the source-side mobility management network element sent by the source-side mobility management network element, a message that the SGs association is established for the user equipment, and obtain the source-side movement from the message. The sexual management network element establishes an SGs association for the user equipment; or

The second obtaining unit, configured to acquire the source side mobile device from the update request sent by the user equipment, by using the second acquiring unit of the user equipment that is obtained from the source side mobility management network element The sex management network element establishes an SGs association for the user equipment.

The target-side mobility management network element according to any one of claims 15 to 17, wherein the first release message sent by the sending unit includes indication information, where the indication information indicates The target side mobility management network element cannot establish an SGs association for the user equipment; or

The first release message sent by the sending unit includes indication information, where the indication information indicates that the HSS/HLR sends a second release message to the mobile switching center.

19. A network device, comprising:

And a releasing unit, configured to release, according to the indication information received in the receiving unit, the S Gs association established by the source-side mobility management network element for the user equipment.

The network device of claim 19, further comprising:

21. The network device of claim 19, wherein

The releasing unit is configured to: when the indication information indicates that the HSS/HLR sends a second release message to the mobile switching center, send a second release message to the mobile switching center according to the indication information, and release source-side mobility management. The SG s association established by the NE for the user equipment.

22. A network system, comprising: a target side mobility management network element and a network device, wherein

And the network device is configured to receive a first release message sent by the target side mobility management network element, and release, according to the indication information, an SGs association established by the source side mobility management network element for the user equipment.

The network system according to claim 22, wherein, when the network device is a source-side mobility management network element, the indication information indicates that the target-side mobility management network element cannot establish an SGs association for the user equipment. ;

The network system according to claim 22, wherein, when the network device is an HSS/HLR, the indication information instructs the HSS/HLR to send a second release message to the HSS/ in the mobile switching. The HLR is configured to send a second release message to the mobile switching center according to the indication information, and release the SGs association established by the source-side mobility management network element for the user equipment.

25. A network system, comprising:

a home subscriber server/home location register, configured to send a cancel location message to the source side mobility management network element when the mobility management network element serving the user equipment changes;

a source-side mobility management network element, configured to receive a cancel location message sent by the home subscriber server/home location register, and determine that the source mobility management network element establishes an SGs association for the user equipment, and performs mobility switching. The center sends a separation indication message, so that the mobile switching center releases the SGs association established by the source side mobility management network element for the user equipment.

The network system according to claim 25, wherein the network system further comprises: a mobile switching center, configured to receive a separation indication message sent by the source side mobility management network element, and determine the received source side When the representation of the mobility management network element is consistent with the identifier of the saved mobility management network element, the SGs association established by the source-side mobility management network element for the user equipment is released.

27. The network system of claim 25 or 26, wherein

The mobile switching center is further configured to migrate the state of the SGs association to "SGs empty".