WO2011100887A2

WO2011100887A2 - Processing method, communication device, communication system and user equipment for resource release

Info

Publication number: WO2011100887A2
Application number: PCT/CN2011/070877
Authority: WO
Inventors: 陈中平; 闫学霞; 于益俊
Original assignee: 华为技术有限公司
Priority date: 2011-02-01
Filing date: 2011-02-01
Publication date: 2011-08-25
Also published as: WO2011100887A3; CN102273296B; CN102273296A

Abstract

A processing method, a communication device, a communication system and a User Equipment (UE) for resource release are provided in the embodiments of the present invention. The method includes the following steps: receiving a registration request message sent by a UE (102); sending a first message including an indication about releasing the Circuit Switched (CS) resource of the UE to a first device, to make the first device notify a Mobile Switch Center/Visitor Location Register (MSC/VLR) to release the CS resource of the UE (104).

Description

Resource release processing method, communication device, communication system, and user equipment

The present invention relates to the field of communications technologies, and in particular, to a method for processing resource release, a communication device, a communication system, and a user equipment.

Background technique

GPRS (Generera 1 Packet Radio Service) / UMTS (Universal Mobile Telecommunications System) is a mobile communication network defined by the 3GPP (The 3rd Generation Partnership Project) organization. It includes two parts: RAN (Radio Access Network) and CN (Core Network). The RAN can be either GERAN (GSM EDGE Radio Access Network, GSM EDGE Radio Access Network) and/or UTRAN (UMTS Terrestrial Radio Access Network). Among them, the CN is logically divided into a CS Domain (Circuit Switched Domain) and a PS Switched Domain (Packet Switched Domain). The CS domain mainly handles voice services, and the PS domain mainly handles packet services. The signaling plane control entity of the CS domain is MSC (Mobile Switch Center) and/or VLR (Visitor Location Register), MSC/VLR; the signaling plane control entity of the PS domain is SGSN (Serving GPRS) Support Node, GPRS support node), SGSN and MSC/VLR can be connected through Gs interface. The above GPRS/UMTS network architecture may also be referred to as the GERAN/UTRAN network architecture.

In the GERAN/UTRAN network architecture, the UE (User Equipment) can be registered to the packet domain through the joint registration process, for example, the network mode I, ie, the SGSN and the MSC/VLR support the Gs interface. The registration to the circuit domain is completed simultaneously. For example, the UE initiates a joint attach procedure or a joint routing area/location area update procedure, completes registration with the SGSN, and completes registration with the MSC/VLR through the SGSN. In the process of joint registration, the Gs association is established between the SGSN serving the UE and the MSC/VLR, and the MSC/VLR stops starting the implicit separation timer. Follow-up, MSC/VLR The resource is released by receiving a separate indication sent by the SGSN. For example, when the UE is powered off, the UE sends the separation indication information to the SGSN, and the SGSN sends the separation indication to the MSC/VLR through the Gs interface, and the MSC/VLR detaches the UE from the circuit domain, that is, releases the CS resource.

With the development of wireless broadband technology, while maintaining the leading edge of the 3GPP network, 3GPP developed the Long Term Evolution (LTE) at the end of 2004. Under the guidance of this evolution plan, an EPS network architecture (evolved packet network) is defined, which is flatter than the GPRS/UMTS network architecture and retains only the packet domain. The core network mainly includes an MME (Mobi Management Management Entity), an S-GW (Serving Gateway, a monthly service gateway), and a PDN-GW (Gateway Packet Data Network Gateway). Logical function; The radio access network is called E-UTRAN (Evolved UMTS Territorial Radio Access Network). The above EPS network architecture can be referred to as the E-UTRAN network architecture.

In the E-UTRAN network architecture, in order to reuse existing CS services in the EPS network, 3GPP proposes an architecture to connect to the CS domain core network through the EPS network, that is, the MME connects to the MSC/VLR through the SGs interface. At this time, the UE completes registration to the circuit domain simultaneously in the process of registering to the packet domain through the joint registration procedure. For example, the UE initiates a joint attach procedure or a joint tracking area/location area update procedure in the packet domain, completes the registration with the MME, and completes registration with the MSC/VLR through the MME. In the process of joint registration, the MME of the serving UE establishes an SGs association with the MSC/VLR, and the MSC/VLR stops starting the implicit separation timer. Subsequently, the MSC/VLR releases the resource by accepting the separation indication sent by the MME. For example, when the UE is powered off, the UE sends the separation indication information to the MME, and the MME sends the separation indication to the MSC/VLR through the SGs interface, and the MSC/VLR UE separates from the circuit domain, that is, releases the CS resource.

The registration in the Old SGSN/MME (old SGSN/MME) and the MSC/VLR is done if the UE has passed the joint update procedure (eg, the federated routing area/location area update procedure or the federated tracking area/location area update procedure). When the UE initiates a registration procedure to the New MME (new MME), but does not instruct the network to create an SGs association for it; or the UE to New MME The registration process is initiated and the SGs association is requested to be created, but the New MME does not support the SGs interface. The New MME fails to establish an SGs association with the MSC/VLR, so that the New MME cannot release the CS resources on the MSC/VLR.

Summary of the invention

The embodiment of the present invention provides a method for processing a resource release, a communication device, a communication system, and a user equipment. When the SGs association is not established between the MME and the MSC/VLR, the CS resources of the UE on the MSC/VLR may also be released.

A method for processing resource release, the method comprising:

Receiving a registration request message sent by the user equipment UE;

Transmitting, to the first device, a first message, where the first message includes an indication of releasing a CS resource of the UE, to enable the first device to notify the mobile switching center/visit location register MSC/VLR to release the UE Circuit switched CS resources.

A method of resource release, including:

Receiving a registration accept message sent by the new MME, where the registration accept message includes an indication of a joint registration or an evolved packet domain EPS registration;

Sending a third message to the second device, where the third message includes a circuit switched CS separation indication, so that the second device sends the first message to the HSS/HLR, so that the HSS/HLR notifies the mobile switching center/ The visitor location register MSC/VLR releases the CS resource of the UE, and the first message includes an indication of releasing the CS resource of the UE.

A communication device, comprising:

a receiving unit, configured to receive a registration request message sent by the user equipment UE;

a sending unit, configured to send a first message to the first device, where the first message includes an indication of releasing the circuit switched CS resource of the UE, to enable the first device to notify the mobile switching center/visit location register The MSC/VLR translates the CS resources of the UE.

A communication system comprising:

The mobile management entity receives a registration request message sent by the user equipment, and sends a first message to the first device, where the first message includes an indication for releasing the CS resource of the UE;

The first device, configured to receive a first message sent by the mobility management entity, to notify the mobile switching center/visit location register MSC/VLR to release the circuit switched CS of the UE Resources.

A user equipment, including:

a receiving unit, configured to receive a registration accept message sent by the new MME, where the registration accept message includes an indication of a joint registration or an evolved packet domain EPS registration;

a sending unit, configured to send a third message to the second device, where the third message includes a circuit switched CS separation indication, so that the second device sends the first message to the HSS/HLR, so that the HSS/HLR Notifying the mobile switching center/visiting location register MSC/VLR to release the CS resource of the UE, where the first message includes an indication of releasing the CS resource of the UE.

A communication device, comprising:

a receiving unit, configured to receive a third message sent by the user equipment UE, where the third message includes a circuit switched CS separation indication;

a sending unit, configured to send the first message to the HSS/HLR, to enable the HSS/HLR to notify the mobile switching center/visit location register MSC/VLR to release the CS resource of the UE, where the first message includes releasing the An indication of the UE's CS resources.

The processing method for the resource release, the communication device, the communication system, and the user equipment provided by the embodiment of the present invention may be triggered by the first device notifying the MS C / VLR if the SG s association is not established between the MME and the MS C / VL R. The MSC/VLR translates the circuit-switched CS resources of the UE, thereby avoiding waste of network resources related to the CS service.

DRAWINGS

FIG. 1 is a flowchart of a method for processing resource release according to an embodiment of the present invention; FIG. 2 is a flowchart of another method for processing resource release according to an embodiment of the present invention; FIG. 4 is a flowchart of a method for processing resource release according to an embodiment of the present invention; FIG. 5 is a flowchart of another method for processing resource release according to an embodiment of the present invention; FIG. 7 is a flowchart of a method for processing resource release according to an embodiment of the present invention; FIG. 8 is a flowchart of a method for processing resource release according to an embodiment of the present invention; a structural diagram of a communication device;

FIG. 9 is a structural diagram of a communication system according to an embodiment of the present invention; FIG. 10 is a structural diagram of a user equipment according to an embodiment of the present invention;

FIG. 11 is a structural diagram of a communication device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1, an embodiment of the present invention provides a method for processing resource release, and the method includes the following steps:

102. The MME receives a registration request message sent by the user equipment UE.

The MME sends a first message to the first device, where the first message includes an indication that the circuit-switched CS resource of the UE is released, so that the first device notifies the MSC/VLR to release the CS resource of the UE. .

In the embodiment of the present invention, the circuit-switched CS resource that causes the first device to notify the MSC/VLR to release the UE includes:

After receiving the first message, the first device sends a second message to the MSC/VLR to trigger the MSC/VLR to release the circuit switched CS resources of the UE.

In an embodiment of the present invention, the MME receives the registration request message sent by the UE to indicate joint update/registration, and the MME supports the joint update/registration procedure, that is, according to the registration request of the UE, the MME may cooperate with the MSC. /VLR establishes an SGs association, then the MME does not send the first message to the first device. If the SGs association is not established between the MME and the MSC/VLR, for example, the registration request message sent by the UE that is received by the MME does not indicate the joint update/registration; or the registration request sent by the MME is sent by the MME. The message indicates joint update/registration, but the MME does not support the joint update/registration procedure (or CS domain unavailable - "CS domain available"), then the MME sends the first message to the first device.

In the embodiment of the present invention, the MME supporting the joint update/registration process may be regarded as the MME supporting CSFB (Circuit Switched Fallback) or SMS over SGs (Short Message Passing SGs). The MME does not support the joint update/registration process and can be considered as MME. Hold CSFB or SMS over SGs. The reason why the SGs interface is not configured is that the MME does not support the SGs interface.

Further, in another embodiment of the present invention, the MME may further report the first message to the first device according to the preset trigger condition.

In still another embodiment of the present invention, the according to the preset trigger condition includes at least one of the following manners:

Carrier configuration;

The UE is a data type terminal;

The UE is an IMS-enabled voice type terminal and the current network supports IMS voice; the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR;

When the idle state saving signaling ISR is not activated.

In another embodiment of the present invention, the method of confirming that the old SGSN/MME and the MSC/VLR establish a Gs/SGs association includes at least one of the following manners:

Upon receiving the temporary mobile subscription identifier TMSI information in the TAU Request or Attach Request message, it is confirmed that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR; or

When the UE related context acquired from the old SGSN/MME includes the information for creating the Gs/SGs association, it is confirmed that the Old SGSN/MME establishes a Gs/SGs association with the MSC/VLR.

The information for creating the Gs/SGs association includes: MSC/VLR information, TMSI information or Gs/SGs association information.

In another embodiment of the present invention, when the first device is an old SGSN/MME, the first message includes whether the new MME supports the indication information of the SGs interface or whether the CS service of the network to which the new MME belongs is available. Instructions.

In another embodiment of the present invention, the transmitting the first message to the old SGSN/MME includes:

In the tracking area update TAU process, a context confirmation Context Ack message is sent to the old SGSN/MME; or

In the handover Handover process, the Forward Relocation Response message is sent to the old SGSN/MME or the Forward Relocation Notification is forwarded. Complete No tifi ca t ion message.

In another embodiment of the present invention, after receiving the first message, the first device sends a second message to the mobile switching center MSC/visiting location register VLR, including:

When the first device confirms that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR, the first device sends a second message to the MSC/VLR by default; or

When the first device confirms that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR, the old MME/SGSN sends a second message to the MSC/VLR according to the preset trigger condition.

In another embodiment of the present invention, when the first device is an old SGSN/MME, the preset triggering condition includes at least one of the following manners:

Confirm that the ISR is not activated;

Receiving indication that the new MME does not support the SGs interface; and

Receiving indication information that the CS service of the network to which the new MME belongs is unavailable.

In the embodiment of the present invention, the MSC/VLR is the MSC/VLR serving the UE, and the CS resource of the UE is released, including: deleting the UE context on the MSC/VLR.

In another embodiment of the present invention, the MME is an MME currently serving the UE, and may also be called a new MME, a new MME or a target MME, etc. The old SGSN/MME is an SGSN/MME that previously served the UE, and may also be It is called source side SGSN/MME or old side SGSN/MME.

In the embodiment of the present invention, the first device may be an HSS/HLR or an old SGSN/MME. The registration request message may be an attach request (Attach Reque st) message, or may be a tracking area update request (TAU Reque st) message, and the registration request message may also be a detach request message sent by the UE, where the detach request message includes the The UE needs an indication to separate from the CS network, and the like. The circuit switched CS resources of the UE include the context of the UE. The first message may be an update location request Update Location Request message. In an embodiment of the present invention, the second message may be a Cancel Location Request Cancel Location Request message.

In the method provided by the embodiment of the present invention, if the SGs association is not established between the new MME and the MSC/VLR, the MSC/VLR may be notified by the first device to trigger the circuit-switched CS resource of the MSC/VLR to release the UE, thereby avoiding the CS service. Waste of related network resources.

As shown in FIG. 2, the embodiment of the present invention provides another method for processing resource release, and the method includes the following steps: 202. The UE receives a registration accept message sent by the new MME, where the registration accept message includes an indication of a joint registration or an EPS registration.

The UE sends a third message to the second device, where the third message includes a CS separation indication, so that the second device sends the first message to the HSS/HLR, so that the HSS/HLR notifies the mobile switching center. The visitor location register MSC/VLR releases the circuit switched CS resources of the UE, and the first message includes an indication of releasing the CS resources of the UE.

In an embodiment of the present invention, the circuit-switched CS resources for the H S S / H L R to notify the mobile switching center/visiting location register MSC/VLR to release the UE include:

After receiving the first message, the HSS/HLR sends a second message to the mobile switching center MSC/visit location register VLR to trigger the MSC/VLR to release the circuit switched CS resources of the UE.

The MSC/VLR releasing the circuit switched CS resources of the UE includes: deleting a context of the UE on the MSC/VLR.

In another embodiment of the present invention, the UE receives a registration accept message sent by the new MME, where the registration accept message includes an indication of a joint registration or an EPS registration, including:

Receiving, by the UE, an attach accept message sent by the new MME, where the attach accept message includes the attachment type being a joint attachment or an EPS attachment; or

The UE receives the area update accept message sent by the new MME, where the area update accept message includes the tracking area update type as a joint update or an EPS update.

In another embodiment of the present invention, the UE determines that the current network does not support the CS service, and determines to camp on the current network, and sends a third message to the second device.

In still another embodiment of the present invention, the UE determines that camping on the current network includes at least one of the following:

Determining that the type of the UE is a data type;

Determining that the UE is an IMS-enabled voice type terminal and the current network supports IMS voice; or

It is determined that the UE has completed registration to the CS.

In an embodiment of the present invention, the first message is a notification request Notify Request message, and the second message is a Cancel Location Request message. The third message is a split request Detach Request message, and the CS split indication is indicated by indicating the Detach type of the Detach Reques t message as IMSI detach.

In another embodiment of the present invention, the second device may be a new MME or a P-CSCF (Proxy-Call Session Control Function Entity).

In the method provided by the embodiment of the present invention, if the SGs association is not established between the MME and the MSC/VLR, the MSC/VLR may be notified by the first device to trigger the circuit-switched CS resource of the MSC/VLR to release the UE, thereby avoiding the CS service related. Waste of network resources.

A method and device for processing resource release are described in detail below in conjunction with specific application scenarios. For example, the application scenario is as follows: The UE initiates a registration process (for example, a tracking area update process or an attach process) to the New MME (new MME). In addition, before this, the UE has completed the Old SGSN/MME (Old SGSN/MME) and the MSC through the previous joint update procedure (for example, the joint routing area/location area update procedure or the joint tracking area/location area update procedure). /VLR registration.

In the embodiment shown in FIG. 3, the New MME triggers the HSS/HLR to send a message to the MSC/VLR, thereby triggering the MSC/VLR to release the CS service related network resources of the UE. The following describes in detail a method for handling resource release, including:

301. The UE sends a registration request message to the New MME, where the registration request message may be a tracking area update request message (TAU Request) or an attach request message (Attach Request). details as follows:

1) The UE sends a Tracking Area Update Request message -TAU Request to the New MME. The type of update in the TAU Request message - "EPS Update type" indicates a joint update. Specifically, the "EPS Update type" indication is "combined TA/LA updating" or "combined TA/LA updating with IMSI attach,".

2) The UE sends a tracking area update request message-TAU Request to the New MME, and the update type in the TAU Reques message - "EPS Update type" indicates a tracking area update. Specifically, the "EPS Update type" indication is "TA updating,,. Or, 3) The UE sends an attach request message - Attach Request to the New MME. The attachment type in the Attach Request message - "EPS attach type" indicates an EPS attachment. Specifically, the "EPS attach type" indication is "EPS Attach,,. Or,

4) The UE sends an attach request message -Attach Request to the New MME. The attachment type in the Attach Request message - "EPS attach type" indicates a joint attachment. Specifically, the "EPS attach type" indication is "combined EPS/IMSI a 11 a c h,,.

When "EPS Update type" indicates a joint update or EPS attach type" indicates a joint attachment, it means that the UE requests the network to create an SGs association for it.

302. The New MME sends, to the HSS/HLR, a first message including an indication that the CS resource of the UE is released, to instruct the HSS/HLR to send a second message to the MSC/VLR of the serving UE to trigger the serving UE. The MSC/VLR releases the CS resources of the UE.

For example, the New MME sends a first message (eg, Update Location Request message - Update Location Request message) to the HSS/HLR to instruct the HSS/HLR to send a second message (eg, cancel the location request Cancel Location Request message) to the MSC/VLR to The MSC/VLR is triggered to release the CS resources of the UE (delete the saved UE-related context).

Specifically, the Update Location Request message includes indication information for releasing the CS resource of the UE. The representation form of the indication information of the CS resource for releasing the UE includes: setting an existing cell “ULR Flags” in the Update Location Reques t message to a bit (bit), or adopting the Update Location Request message. A specific cell, such as "CS release Indicator,,.

In the embodiment of the present invention, in the foregoing step 301, the registration request message sent by the UE received by the New MME indicates joint update/registration, and the NewMME supports the joint update/registration process, that is, according to the UE request, the NewMME may The SGs association is established with the MSC/VLR, and then the New MME does not send the first message to the first device. If the SGs association is not established between the NewMME and the MSC/VLR, for example, the new MME does not indicate the joint update/registration in the registration request message sent by the UE; or the new MME receives the UE. Joint update/registration is indicated in the registration request message, but the NewMME does not support the joint update/registration process (Or CS domain is not available - "CS domain available"), the B'J New MME sends the first message to the first device. Or, at this time, the New MME may also send the first message to the first device according to a preset trigger condition. The first message to the first device according to the preset trigger condition includes at least one of the following manners:

Trigger condition 1. Carrier configuration. For example, the operator may configure the MME to confirm that the UE switches/move from the GERAN/UTRAN network of the network mode I, and the MME sends the first message to the first device. Specifically, the MME may perform the local configuration of the network mode information of the PLMN network on the MME. When receiving the registration request message sent by the UE, the MME obtains the PLMN information by using the identifier information in the registration request message. The information includes the PLMN ID, that is, the PLMN identification information, and then the network mode information corresponding to the PLMN network may be determined, thereby determining whether to send the first message to the first device.

Trigger Condition 2: When the New MME confirms that the ISR (Idle Mode Signalling Reduction) is not activated, the NewMME sends the first message to the HSS/HLR. ISR activation means that the UE can remain registered in the Old SGSN and the New MME at the same time. If the Gs association is established between the Old SGSN and the MSC/VLR, the association cannot be released at this time. That is, the activation of the ISR means that the previously established Gs association needs to be maintained, otherwise the UE will be inconsistent with the state of the network, and the impact will be an experience. Therefore, when the ISR is not activated, the NewMME can send the first message to the HSS/HLR.

Trigger condition 3. The New MME confirms that the UE is a data type terminal. The acknowledgment mode is that, in step 301, the TAU Request Attach Request message sent by the UE to the New MME includes "Voice domain preference and UE's usage setting" (the voice domain preference and the user equipment usage setting). "Voice domain preference and UE's usage setting" is further divided into "UE's usage setting" and "Voice domain preference for E-UTRAN" (voice domain preference under E-UTRAN system) section. If the "UE s usage setting" is set to "Data centric" (centered on the data type), the New MME confirms that the UE is a data type terminal. When the policy 1 is adopted, the New MME confirms that the UE is a data type terminal, and sends the first message to the HSS/HLR.

Trigger condition 4. The New MME confirms that the UE is a voice type terminal supporting IMS and the current network supports IMS voice. The confirmation mode is, in step 301, the TAU sent by the UE to the New MME. The Reques t or Attach Reques t message includes "Vo ce doma in preference and UE's usage setting" (voice domain preference and user equipment usage settings). "Voice doma in preference and UE's usage setting" is further divided into "UE's usage setting" and "Voice domain preference for E-UTRAN"("Voice domain preference for E-UTRAN system") Two parts. If "UE s usage setting" is set to "Voice centric", ΜΜΕ confirm that the UE is a voice type terminal; "Voice domain preference for E-UTRAN" is set to "IMS PS Voice only""voice") or "CS voice preferred, IMS PS voice as secondary" or "IMS PS voice preferred, CS Voice as secondary (IMS packet voice preferred, circuit domain voice second) ", New MME confirms that the UE supports IMS voice. The New MME confirms that the service network also supports IMS voice (IMS voice over PS session is supported to support IMS voice) can be configured locally. When the policy 2 is adopted, the New MME confirms that the UE is an IMS-enabled voice type terminal and the current network supports the IMS voice, and then sends the first message to the HSS/HLR.

The condition of the horny bug is 5. The New MME confirms whether the old SGSN/MME and the MSC/VLR of the monthly service UE have a Gs/SGs association. If the MME confirms that the UE has completed the joint update/registration at the old SGSN/MME, that is, confirms that the old SGSN/MME has established Gs/SGs association with the MSC/VLR of the serving UE, the MME sends the foregoing to the HSS/HLR. a message.

Specifically, the foregoing method for confirming whether the Old SGSN/MME and the MSC/VLR of the serving UE are associated with the Gs/SGs may adopt any one of the following:

i) In step 301, the TAU Request or Attach Request message sent by the UE to the NewMME includes indication information (for example, the message includes TMSI information, TMSI-Temporary Mobile Subscriber Identity, temporary mobile subscription label i only), the indication information Used to indicate that the UE has completed the joint update/registration. When the New MME receives the TMSI information in the TAU Request or Attach Request message, it is confirmed that the Old SGSN/MME establishes a Gs/SGs association with the MSC/VLR of the serving UE.

Ii) The new MME learns from the UE related context obtained from the Old SGSN/MME whether the Old SGSN/MME and the MSC/VLR of the serving UE are associated with Gs/SGs. Specifically, if the UE related context includes information for creating a Gs/SGs association (for example, an MSC/VLR letter) Information, TMSI information, Gs/SGs association information (Gs/SGs association is set to Gs_ASSOCIATED/SGs_ASSOCIATED), etc., and the 'J New MME can confirm that the Old SGSN/MME has established Gs/SGs association with the MSC/VLR of the serving UE. .

Iii) It is not excluded here that the New MME confirms that the UE has created the Gs/SGs association by other means, that is, whether the Old SGSN/MME and the MSC/VLR of the serving UE are associated with Gs/SGs.

It should be noted that, in addition to the preset policies listed above, the present invention does not exclude whether the New MME sends the first information to the HSS/HLR according to other policy information.

303. After receiving the first message that includes the indication information of the CS resource that releases the UE, the HSS/HLR sends the service to the service according to the saved MSC/VLR information (MSC/VLR address information-MSC/VLR Number) of the UE. The MSC/VLR of the UE sends a Cancel Location Request Cancel Location Request message.

After the UE successfully registers with the MSC, the MSC sends the MSC/VLR information related to the UE to the HSS/HLR, and the HSS/HLR saves the MSC/VLR information related to the UE.

304. The MSC/VLR that serves the UE receives the Cancel Location Request message sent by the HSS/HLR, and releases the CS resource of the UE, that is, deletes the saved context related to the UE. After that, return a Cancel Location Answer message to the HSS/HLR.

305. The HSS/HLR sends an Update Location Answer message to the New MME.

306. The New MME returns a registration accept message to the UE, for example, the Attach Accept-Attach Accept/Tracking Area Update accepts the TAU Accept message.

In the embodiment shown in FIG. 3, when the MME of the serving UE and the MSC/VLR of the serving UE do not establish an SGs association and the MSC/VLR of the serving UE has stopped the implicit separation timer, the New MME triggers the HSS/HLR. The message is sent to the MSC/VLR of the UE, so that the MSC/VLR that triggers the serving UE releases the CS service-related network resources of the UE.

In the embodiment shown in FIG. 4, the UE triggers the HSS/HLR to send a message to the MSC/VLR of the serving UE through the New MME, thereby triggering the MSC/VLR of the serving UE to release the CS service related network resources of the UE. The following describes in detail a method for processing resource translation, including:

401. The UE sends a registration request message to the New MME. This step is the same as step 301 in the embodiment shown in FIG. 3, and is not described here. For details, refer to step 301 in the embodiment shown in FIG. Related description.

402. The New MME sends an update location request to the HSS/HLR - Upda te Location Reques t message.

403. The HSS/HLR returns an update location answer -Upda te Location Answer message to the New MME.

404. The New MME returns a registration accept message to the UE, where the registration accept message may be a TAU Accept or an Attach Accept message. details as follows:

1) New MME sends a Tracking Area Update Accept message -TAU Accept to the UE. The cell "Update Result" - "EPS update result" in the TAU Accept message indicates that the tracking area is updated. Specifically, the "EPS Update type" indication is "TA updated" or "TA upda ted and I SR activated,".

2) New MME sends a Tracking Area Update Accept message -TAU Accept to the UE. The update result in the TAU Accept message - "EPS update result" indicates a joint update. Specifically, the "EPS Update type" indication is "combined TA/LA updated" or "combined TA/LA upda ted and I SR activated,".

3) The New MME sends an attach accept message -Attach Accept to the UE. The result of the attachment in the Attach Accept message - "EPS attach result" indicates an EPS attachment. Specifically, the "EPS attach result" indication is "EPS only,,. Or,

4) The New MME sends an attach accept message -Attach Accept to the UE. The result of the attachment in the Attach Accept message - "EPS attach result" is indicated as a joint attachment. Specifically, the "EPS attach result" indication is "combined EPS/IMSI attach,,.

405. The UE sends a third message including the CS separation indication to the NewMME, indicating that the network will not access the CS, that is, indicating that the network UE needs to be separated from the CS. The specific manner may be that the UE sends a detach request -Detach Request message to the MME, where the detach type of the message - "Detach type" indicates CS separation, that is, "Detach type" indicates "IMSI detach".

It should be noted that the trigger condition for the UE to send the foregoing CS separation indication to the New MME may be one of the following cases:

First, the UE confirms that the current E-UTRAN network does not support CS services. For example, in the above In steps 401 and 404, if "EPS Update type" in step 401 indicates a joint update, and "EPS Update result" in step 4 indicates a tracking area update, and the cell "EMM cause" indicated in the message in step 4 is indicated as "#18 (CS domain not available)", that is, the UE confirms that the current E-UTRAN network does not support the CS service; or as described in steps 401, 404, if the "EPS attach type" indication in step 401 is a joint attachment, the steps are The "EPS attach result" indication in 404 is EPS attachment, and the EMM cause indication in step 404 is "#18 (CS domain not ava i lable),,.

The UE then confirms that the current serving network (E-UTRAN) is unchanged, rather than reselecting to the GERAN/UTRAN cell camping, i.e., camping on the E-UTRAN network. The principle of confirming that the current service network (E-UTRAN) remains unchanged can be:

i) The UE acknowledges the type as a data type. The confirmation mode is that when "UE, s usage setting" is set to "Data centric", the UE is a data type. Or,

Ii) The UE confirms that it is a voice type terminal supporting IMS and the current network supports IMS voice. The confirmation method is: "UE's usage setting" is set to "Voice centric", "Voice domain preference for E-UTRAN" is set to "IMS PS Voice only" or "CS voice preferred, IMS PS Voice as secondary" or "IMS" In addition, the method of confirming the network support IMS voice is as follows: Step 404: The received message carries the message "IMS Voice over PS session supported", that is, the current service network supports IMS voice. and many more.

Finally, if the UE confirms that registration to the CS has been completed through the previous joint registration/update procedure, the UE may send a third message to the New MME indicating that the network will no longer access the CS.

The embodiment of the present invention does not exclude other situations from triggering the UE to send the foregoing third message including the CS separation indication to the New MME.

406. After receiving the third message that is sent by the UE and including the CS separation indication, the new MME confirms that the current network does not support the CS service. For example, if the New MME does not configure the SGs interface and cannot interact with the MSC/VLR, the New MME is configured according to the CS. Separating the first message indicating that the indication information of the CS resource of the UE is released to the HSS/HLR, to instruct the HSS/HLR to send a second message to the mobile switching center MSC/VLR of the serving user equipment UE to trigger The MSC/VLR of the serving UE releases the circuit switched CS resources of the UE. For example, the New MME sends a notification request-Not if y Request message to the HSS/HLR to instruct the HSS/HLR to send a Cancel Location Request message to the MSC/VLR of the serving UE. The Not if y Reques t message carries the indication information of releasing the CS resource of the UE. The indication form of the indication information of the CS resource for releasing the UE may be: the representation form of the indication information of the CS resource of the release UE includes: setting a bit of the existing cell "ULR Flags" in the Notify Request message by one bit Bit, or a specific cell in the Notify Request message.

407. After receiving the first message that includes the indication information of the CS resource that releases the UE, the HSS/HLR sends the service to the service according to the saved MSC/VLR information (MSC/VLR address information-MSC/VLR Number). The MSC/VLR of the UE sends a Cancel Location Request Cancel Location Request message.

408. The MSC/VLR that serves the UE receives a Cancel Location Request message sent by the HSS/HLR, and releases the CS resource of the UE, that is, deletes the saved context related to the UE. After that, return a Cancel Location Answer message to the HSS/HLR.

409. The HSS/HLR sends a notification to the New MME to answer the Notify Answer message.

410. The New MME returns a CS separation accept IMSI Detach Accept message to the UE. In the embodiment shown in FIG. 4, when the SGs association between the MME serving the UE and the MSC/VLR serving the UE is not established and the MSC/VLR serving the UE has stopped the implicit separation timer, the UE passes the New MME Hornworm. The HSS/HLR sends a message to the MSC/VLR of the UE, so as to implement the CS service related network resource of the MSC/VLR UE that triggers the serving UE.

In the embodiment shown in FIG. 5, the UE triggers the HSS/HLR to send a message to the MSC/VLR of the serving UE through the P-CSCF, thereby triggering the MSC/VLR of the serving UE to release the CS service related network resources of the UE. The following describes in detail a method for processing resource translation, including:

Steps 501-504 are the same as steps 401-404 in the embodiment shown in FIG.

505. The UE completes registration in the IMS.

506. The UE sends a third message including the CS separation indication to the IMS control network element P-CSCF, indicating that the network will no longer access the CS, that is, indicating that the network needs to be separated from the CS. For example, the UE sends a Detach Request-Detach Request message to the P-CSCF, in which the separation type - "Detach type" indicates CS separation, ie, "Detach type" indication is "IMSI detach". 507. The P-CSCF sends, according to the received CS separation indication sent by the UE, the first message to the HSS/HLR, including the indication information of the CS resource that releases the UE, to indicate that the HSS/HLR is in the service. The mobile switching center MSC/VLR of the user equipment UE sends a second message to trigger the MSC/VLR of the serving UE to release the circuit switched CS resources of the UE.

For example, the P-CSCF sends a notification request -Notify Request message to the HSS/HLR to indicate that the HSS/HLR sends a Cancel Location Request message to the MSC/VLR of the serving UE. The message triggers the HSS/HLR to send a message to the MSC/VLR of the UE, to release the UE-related CS resources.

508. After receiving the first message that includes the indication information of the CS resource that releases the UE, the HSS/HLR sends the service to the service according to the saved MSC/VLR information (MSC/VLR address information-MSC/VLR Number) of the UE. The MSC/VLR of the UE sends a Cancel Location Request Cancel Location Request message.

509. The MSC/VLR that serves the UE receives the Cancel Location Request message sent by the HSS/HLR, and releases the CS resource of the UE, that is, deletes the saved context related to the UE. After that, return a Cancel Location Answer message to the HSS/HLR.

510. The HSS/HLR notifies the sending P-CSCF to answer the Notify Answer message.

511. The P-CSCF returns a CS separation and accept IMSI Detach Accept message to the UE. It should be noted that the above P-CSCF can also be replaced with other application layer entities. In the embodiment shown in FIG. 5, when the SGs association between the MME serving the UE and the MSC/VLR serving the UE is not established and the MSC/VLR serving the UE has stopped the implicit separation timer, the UE passes the P-CSCF angle. The spoofing HSS/HLR sends a message to the MSC/VLR of the UE, so as to implement the CS service-related network resources of the MSC/VLR UE that triggers the serving UE.

In the embodiment shown in FIG. 6, in the tracking area update TAU, the old SGSN/MME sends a message to the MSC/VLR of the serving UE, thereby triggering the MSC/VLR of the serving UE to release the CS service related network resources of the UE. The following describes in detail a method for processing resource translation, including:

601. The UE sends a tracking area update request message (TAU Request) to the New MME. The update type (Update Type) in the message may be indicated as a federated tracking area/location area update request (the example is a combined Tracking Area/Location Area Update Request, Or a comb ined Tracking Area/Location Area Upda te with IMS I attach Request ), or TA updating.

602. The New MME sends a context request message (Context Reques t) to the Old SGSN/MME.

603. The Old SGSN/MME sends a context response message (Context Response) to the New MME.

604. The New MME sends a context confirmation message (Context Ack) to the Old SGSN/MME. The Context Ack message includes the indication information of whether the New MME supports the SGs interface, that is, the indication information indicating whether the target side can create an SGs association, or whether the CS service of the network to which the new MME belongs is available, that is, the indication target Whether the network supports CS services.

The above indication information can be expressed as follows:

1) The indication information may be a cell "SGs Supported", and the cell value may indicate whether the UE can create an SGs association on the target side. A value of 1 indicates that the SGs association can be created for the UE, and the CS service is available. If the value is 0, the SGs association cannot be created for the UE, and the CS service is unavailable. The embodiment of the present invention does not limit other manners to indicate whether the UE can create an SGs association on the target side.

2) The indication information may be a cell "CS domain available", and the cell value may indicate whether the CS service is available. A value of 1 indicates that the CS service is available. A value of 0 indicates that the CS service is unavailable. The embodiment of the present invention does not limit other manners for indicating whether the CS service is available.

The new MME provides the indication information to the Old SGSN/MME by default, or the New MME selectively provides the indication information to the Old SGSN/MME under certain conditions. For the conditions, refer to step 302 in the method shown in FIG. The trigger condition for the NewMME to send the first message to the HSS/HLR is not described here.

605. The Old SGSN/MME receives the context confirmation message sent by the New MME, and the Old SGSN/MME confirms that the Gs/SGs association has been created for the UE, that is, the Gs/SGs association information (Gs/SGs association) in the Old SGSN/MME is set to Gs/SGs-ASSOCI ATED (or the UE-related Gs/SGs association information (Gs/SGs association) saved by Old SGSN/MME is not Gs/SGs-NULL). 01d The SGSN/MME sends a first message to the MSC/VLR to trigger the MSC/VLR to release the CS service related network resources of the UE. The first message form can be: 1) an IMSI-DETACH-INDICATION message, the MSC/VLR receives the IMSI-DETACH-INDICATION message, and performs an IMSI Detach procedure to separate the UE from the CS, and the CS resource is released;

2) PS/EPS-DETACH - INDICATION message, the MSC/VLR receives the PS/EPS_DETACH_INDICATION message, translates the existing Gs/SGs association, and restarts the implicit separation timer. The timer expires to separate the UE from the CS and the CS resources are released.

On the premise that the Old SGSN/MME confirms that the Gs/SGs association has been created for the UE, the Old SGSN/MME may send a message to the MSC/VLR to trigger the MSC/VLR to release the CS service related network resources by default. The trigger condition is triggered, and the preset trigger condition may be one or a combination of the following:

1) Old SGSN/MME confirms that the ISR is not activated. For example, in the Context Ack message of the foregoing step 604, the New MME does not indicate that the ISR is activated (the ISR activation is not carried in the Context Ack message - "ISR Activated" indication information), and the Old SGSN/MME sends the first message to the MSC/ VLR, to trigger MSC/VLR to translate CS service related network resources; or

2) When the old SGSN/MME receives the indication information that the new MME does not support the SGs interface (in the step 604, the indication information is received), that is, the acknowledgment that the target network cannot create the SGs association for the UE, the Old SGSN/MME sends the first message. To the MSC/VLR, to trigger the MSC/VLR to translate the CS service related network resources; or

3) When the old SGSN/MME receives the indication information that the CS service of the network to which the new MME belongs is unavailable (in the step 604, the indication information is received), that is, the target network CS service is confirmed to be unavailable, the Old SGSN/MME sends a message to the old SGSN/MME. The MSC/VLR triggers the MSC/VLR to translate the CS service related network resources; or

4) This embodiment does not exclude other trigger conditions.

606. The MSC/VLR sends a separation indication acknowledgement IMS I /EPS-DETACH-ACK message to the Old SGSN/MME.

607. The New MME returns a registration accept message to the UE, for example, an attach accept-Attach Accept/Tracking Area Update Accept-TAU Accept message.

In the embodiment shown in FIG. 6, when the MME serving the UE and the MSC/VLR serving the UE When the SGs association is not established and the MSC/VLR of the serving UE has stopped the implicit detach timer, the old SGSN/MME sends a message to the MSC/VLR of the serving UE during the tracking area update TAU, thereby implementing the triggering of the serving UE. The MSC/VLR translates the CS service related network resources of the UE.

In the embodiment shown in FIG. 7, the old SGSN/MME sends a message to the MSC/VLR of the serving UE, thereby triggering the MSC/VLR of the serving UE to release the CS service related network resources of the UE. The following describes in detail a method for processing resource release, including:

701. The Old SGSN/MME sends a Forward Reset Request-Forward Relocation Request message to the New MME, and the context is transferred from the old SGSN/MME to the new MME.

702. The New MME returns a Forward Reset Response-Forward Relocation Response message to the Old SGSN/MME.

703, New MME sends a forwarding reset completion notification to the Old SGSN/MME -Forward Relocation Complete Not if icat ion message

It should be noted that, in the foregoing step 702, the Forward Relocation Response message or the Forward Relocation Complete Not-Isage message in the step 703 may include indication information, where the indication information is used to indicate whether the target side can create an SGs association, or an indication. The information is used to indicate whether the target network supports CS services. For a specific representation manner of the indication information, refer to the related description of the indication information in step 604 in the method in FIG.

In addition, the New MME may provide the indication information to the Old SGSN/MME by default, or the New MME may selectively provide the indication information to the Old SGSN/MME according to the preset triggering conditions. 3 In step 302 of the method, the NewMME sends a first message to the HSS/HLR to instruct the HSS/HLR to send a message to the MSC/VLR of the serving UE to release the trigger condition of the UE-related CS resource, which is not described here.

704. The Old SGSN/MME returns a Forward Reset Complete Acknowledgement-Forward Relocation Complete Acknowledge message to the New MME.

705. After the Old SGSN/MME receives the Forward Relocation Response message sent by the New MME in step 702 or the Forward Relocation Complete Notification message sent in step 703, the Old SGSN/MME confirms that the Gs/SGs association has been created for the UE, and the Old SGSN /Gs/SGs association information in MME (Gs/SGs association) Set to Gs/SGs-ASSOCIATED (or the UE-related Gs/SGs association information (Gs/SGs association) saved by Old SGSN/MME is not Gs/SGs-NULL). The Old SGSN/MME sends a first message to the MSC/VLR to trigger the MSC/VLR to release the CS service related network resources of the UE. The first message form can be:

1) an IMSI-DETACH-INDICATION message, the MSC/VLR receives the IMSI-DETACH-INDICATION message, and performs an IMSI Detach process to separate the UE from the CS, and the CS resource is released;

On the premise that the Old SGSN/MME confirms that the Gs/SGs association has been created for the UE, the Old SGSN/MME may send a message to the MSC/VLR to trigger the MSC/VLR to release the CS service related network resources by default. The trigger condition is triggered. For the preset trigger condition, refer to the description of the preset trigger condition in step 605 of the method shown in FIG. 6.

706. The MSC/VLR sends a separation indication acknowledgement IMS I /EPS-DETACH-ACK message to the Old SGSN/MME.

In the embodiment shown in FIG. 7, when the SGs association between the MME serving the UE and the MSC/VLR serving the UE is not established and the MSC/VLR serving the UE has stopped the implicit separation timer, during the handover of the Handover, The old SGSN/MME sends a message to the MSC/VLR of the UE, so as to trigger the MSC/VLR of the serving UE to release the CS service related network resources of the UE.

As shown in FIG. 8, a communications apparatus provided by an embodiment of the present invention includes:

The receiving unit 801 is configured to receive a registration request message sent by the user equipment UE.

The sending unit 803 is configured to send a first message to the first device, where the first message includes an indication of releasing the circuit switched CS resource of the UE, so that the first device notifies the mobile switching center/visiting location The register MSC/VLR releases the CS resources of the UE.

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

a determining unit 805, configured to determine that an SGs association is not established with the MSC/VLR, where the sending unit 803 is configured to determine, by the determining unit 805, the MSC/VLR When the SGS association is not established, the first message is sent to the first device.

In another embodiment of the invention,

The determining unit 805 is specifically configured to: when the receiving unit 801 does not indicate the joint update/registration in the registration request message sent by the UE, determine that an SGs association is not established with the MSC/VLR; or

The determining unit 805 is specifically configured to: when the receiving unit 801 receives the registration request message sent by the UE, indicating joint update/registration, but the communication device does not support the joint update/registration process, determining There is no SGs association established between MSC/VLR.

In another embodiment of the invention,

The sending unit 803 is specifically configured to: when the determining unit 805 determines that the SGs association is not established with the MSC/VLR, send the first message to the first device according to a preset trigger condition. Carrier configuration;

The UE is a data type terminal;

When the idle state saving signaling ISR is not activated.

In another embodiment of the present invention, when the first device is an old SGSN/MME, the first message includes whether the new MME supports the indication information of the SGs interface or the new MME belongs to. Indicates whether the CS service of the network is available.

In another embodiment of the invention,

The registration request message received by the receiving unit 801 includes: a separation request message sent by the user equipment, where the separation request message includes an indication that the UE needs to be separated from the CS network.

In another embodiment of the present invention, the communication device may be an MME currently serving the UE, and may also be called a new side, a new or a target, and the old SGSN/MME is an SGSN/MME that previously served the UE. It can also be called source side SGSN/MME or old side SGSN/MME.

As shown in FIG. 9, a communication system provided by an embodiment of the present invention includes:

The mobile management entity 902 receives a registration request message sent by the user equipment, and sends a first message to the first device 904, where the first message includes an indication for releasing the CS resource of the UE.

The first device 904 is configured to receive a first message sent by the mobility management entity, and notify the mobile switching center/visit location register MSC/VLR to release circuit switched CS resources of the UE.

In another embodiment of the invention,

The first device 904 is specifically configured to: after receiving the first message, send a second message to the MSC/VLR, to trigger the MSC/VLR to release the CS resource of the UE.

In another embodiment of the invention,

The first device 904 sends a second message to the MSC/VLR by default when confirming that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR of the serving UE; or When the first device 904 confirms that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR, the old MME/SGSN sends a second message to the MSC/VLR according to a preset trigger condition.

In another embodiment of the present invention, the mobility management entity 902 may be an MME currently serving the UE, and may also be called a new MME, a new MME or a target 匪, etc., and the old SGSN/MME is an SGSN that previously served the UE. The MME may also be called a source side SGSN/MME or an old side SGSN/MME.

In the embodiment of the present invention, the first device may be an HSS/HLR or an old SGSN/MME. The registration request message may be an attach request (Attach Reques t) message, or may be a tracking area update request (T AU Reque st ) message, and the registration request message may also be a detach request message sent by the UE, where the detach request message includes The indication that the UE needs to be separated from the CS network, and the like. The circuit switched CS resources of the UE include the context of the UE. The first message may be an update location request Update Location Request message. In an embodiment of the present invention, the second message may be a Cancel Location Request Cancel Location Request message.

As shown in FIG. 10, a user equipment provided by an embodiment of the present invention includes:

The receiving unit 1001 is configured to receive a registration accept message sent by the new MME, where the registration accept message includes an indication of a joint registration or an evolved packet domain EPS registration;

The sending unit 1003 is configured to send a third message to the second device, where the third message includes a circuit switched CS separation indication, so that the second device sends the first message to the HSS/HLR, so that the HSS/ The HLR notifies the mobile switching center/visiting location register MSC/VLR to release the CS resources of the UE, and the first message includes an indication of releasing the CS resources of the UE.

In another embodiment of the invention,

The receiving unit 1001 is specifically configured to receive an attach accept message sent by the new MME, where the attach accept message includes the attach type as a joint attachment or an EPS attachment; or

The receiving unit 1001 is specifically configured to receive an area update accept message sent by the new MME, where the area update accept message includes the tracking area update type being a joint update or an EPS update. In another embodiment of the present invention, the user equipment further includes:

The determining unit 1005 is configured to determine that the current network does not support the CS service, and determine to camp on the current network;

The sending unit 1003 is specifically configured to: when the determining unit determines that the current network does not support the CS service, and determines to camp on the current network, send the third message to the second device.

Determining that the type of the UE is a data type;

It is determined that the UE has completed registration to the CS.

In an embodiment of the present invention, the first message is a notification request Notify Request message, the second message is a Cancel Location Request Cancel Location Request message, and the third message is a Detach Request Detach Request message, the CS The separation indication is indicated by indicating the separation type Detach type in the Detach Reques t message as IMSI detach.

In another embodiment of the present invention, the second device may be a new MME or a P-CSCF (Proxy-Call Session Control Function Entity). As shown in FIG. 11, a communications device provided by an embodiment of the present invention includes:

The receiving unit 1102 is configured to receive a third message sent by the user equipment UE, where the third message includes a circuit switched CS separation indication.

The sending unit 1104 is configured to send a first message to the HSS/HLR, to enable the HSS/HLR to notify the mobile switching center/visit location register MSC/VLR to release the CS resource of the UE, where the first message includes release An indication of the CS resource of the UE.

In another embodiment of the invention,

The sending unit 1104 is further configured to send a registration accept message to the UE, where the registration accept message includes an indication of a joint registration or an evolved packet domain EPS registration.

In another embodiment of the invention, The sending unit 1104 is specifically configured to send an attach accept message to the MME, where the attach accept message includes the attach type as a joint attachment or an EPS attachment; or

The sending unit 1104 is specifically configured to send a regional update accept message to the MME, where the area update accept message includes the tracking area update type as a joint update or an EPS update.

In an embodiment of the invention, the communication device may be a new MME or a P-CSCF. In an embodiment of the present invention, the first message is a notification request Notify Request message, the second message is a Cancel Location Request Cancel Location Request message, and the third message is a Detach Request Detach Request message, the CS The separation indication is indicated by indicating the separation type Detach type in the Detach Reques t message as IMSI detach.

The user equipment, the communication device, and the communication system provided by the foregoing embodiments can delete the CS resources of the UE when the MME does not support the SGs interface, thereby avoiding waste of resources.

The above-mentioned user equipment, communication equipment, and the specific functions of the communication system are not mentioned in the above embodiments, and the descriptions in the embodiments corresponding to FIGS. 1 to 7 can also be referred to.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A method for processing a resource release, the method comprising: receiving a registration request message sent by a user equipment UE;

Transmitting, by the first device, a first message, where the first message includes an indication of releasing the CS resource of the UE, to enable the first device to notify the mobile switching center/visit location register MSC/VLR to release the UE Circuit switched CS resources.

The method for processing a resource release according to claim 1, wherein the causing the first device to notify the MSC/VLR to release the CS resources of the UE comprises:

After the first device receives the first message, the second message is sent to the MSC/VLR to trigger the MSC/VLR to release the CS resource of the UE.

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

Determining that an SG s association is not established with the MSC/VLR, and sending a first message to the first device.

The method for processing a resource release according to claim 3, wherein the determining that the SG s association is not established with the MSC/VLR includes:

If the joint update/registration is not indicated in the registration request message sent by the UE, it is determined that the SG s association is not established with the MSC/VLR; or

If the received registration request message sent by the UE indicates joint update/registration, but does not support the joint update/registration procedure, it is determined that an SG s association is not established with the MSC/VLR.

The method for processing a resource release according to claim 3, wherein the determining that the SG s association is not established with the MSC/VLR, and sending the first message to the first device, includes:

Determining that the SG s association is not established with the MSC/VLR, and sending the first message to the first device according to a preset trigger condition.

The method for processing resource release according to claim 5, wherein the preset trigger condition comprises at least one of the following manners:

Carrier configuration;

The UE is a data type terminal; The UE is an IMS-enabled voice type terminal and the current network supports IMS voice; the old serving GPRS support node SGSN/mobile management entity MME establishes a Gs/SGs association with the MSC/VLR;

When the idle state saving signaling ISR is not activated.

The method for processing resource release according to claim 6, wherein the method for confirming that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR comprises at least one of the following manners:

Upon receiving the temporary mobile subscription identifier TMSI information in the TAU Request or Attach Request message, it is confirmed that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR of the serving UE; or

When the UE-related context acquired from the old SGSN/MME includes information for creating a Gs/SGs association, it is confirmed that the Old SGSN/MME establishes a Gs/SGs association with the MSC/VLR of the serving UE, where the Gs/SGs are created. The associated information includes: MSC/VLR information, TMSI information or Gs/SGs associated information.

The method according to claim 1, wherein when the first device is an old SGSN/MME, the first message includes whether the new MME supports the indication information of the SGs interface or the network to which the new MME belongs. Indicates whether the CS service is available.

The method for processing a resource release according to claim 8, wherein the sending the first message to the old SGSN/MME comprises:

In the handover Handover process, the Forward Relocation Response message is forwarded to the old SGSN/MME or the Forward Relocation Complete Not If icat ion message is forwarded.

The method for processing a resource release according to claim 2, wherein, after receiving the first message, the first device sends a second message to the MSC/VLR of the serving user equipment UE, including:

When the first device confirms that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR of the serving UE, the first device sends a second message to the MSC/VLR by default; or When the first device confirms that the old SGSN/MME establishes a Gs/SGs association with the MSC/VLR, the old MME/SGSN sends a second message to the MSC/VLR according to the preset trigger condition.

The method for processing a resource release according to claim 10, wherein, when the first device is an old SGSN/MME, the preset triggering condition includes at least one of the following manners:

Confirm that I SR is not activated;

Receiving indication that the new MME does not support the SGs interface; and

The method for processing a resource release according to claim 10, wherein the registration request message of the user equipment comprises:

A detach request message sent by the user equipment, where the detach request message includes an indication that the UE needs to be detached from the CS network.

A method for releasing a resource, comprising:

Sending, to the second device, a third message, where the third message includes a circuit switched CS separation indication, so that the second device sends the first message to the HSS/HLR, so that the HSS/HLR notifies the mobile switching center/ The visitor location register MSC/VLR releases the CS resource of the UE, and the first message includes an indication of releasing the CS resource of the UE.

The method for processing a resource release according to claim 13, wherein the releasing the CS resource of the UE by the MSC/VLR of the UE by the HSS/HLR is:

After the HSS/HLR receives the first message, the second message is sent to the MSC/VLR of the UE, to trigger the MSC/VLR to release the circuit switched CS resources of the UE.

The method for processing a resource release according to claim 13, wherein the receiving the registration accept message sent by the new MME, the registration accept message includes an indication of the joint registration or the EPS registration, and the method includes:

Receiving an attach accept message sent by the new MME, where the attach accept message includes the attach type as a joint attachment or an EPS attachment; or

Receiving a regional update accept message sent by the new MME, where the regional update accept message is included The tracking area update type is a joint update or an EPS update.

The method for processing a resource release according to claim 13, wherein before the sending the third message to the second device, the method further includes:

It is determined that the current network does not support the CS service, and it is determined that the current network is camped on, and the third message is sent to the second device.

The method for processing resource release according to claim 16, wherein the determining to camp on the current network comprises at least one of the following manners:

Determining that the type of the UE is a data type;

It is determined that the UE has completed registration to the CS.

18. A communication device, comprising:

The communication device according to claim 18, further comprising: a determining unit, configured to determine that an SGs association is not established with the MSC/VLR;

The sending unit is configured to: when the determining unit determines that an SGs association is not established with the MSC/VLR, send the first message to the first device.

20. The communication device of claim 19, wherein

The determining unit is specifically configured to: when the receiving unit does not indicate the joint update/registration in the registration request message sent by the UE, determine that an SG s association is not established with the MSC/VLR; or

The determining unit is specifically configured to: when the receiving unit receives the registration request message sent by the UE, indicating joint update/registration, but the communication device does not support the joint update I registration process, determining the MSC/ No SGs association is established between the VLRs.

The communication device according to claim 19, wherein the sending unit is specifically configured to: when the determining unit determines that the MSC/VLR is not When the SG S association is established, the first message is sent to the first device according to a preset trigger condition.

The communication device according to claim 18, wherein, when the first device is an old SGSN/MME, the first message includes whether the new MME supports the indication information of the SGs interface or the new MME belongs to Indicates whether the CS service of the network is available.

23. The communication device of claim 18, wherein

The registration request message received by the receiving unit includes: a separation request message sent by the user equipment, where the separation request message includes an indication that the UE needs to be separated from the CS network.

24. A communication system, comprising:

The mobile management entity receives the registration request message sent by the user equipment UE, and sends a first message to the first device, where the first message includes an indication for releasing the CS resource of the UE;

The first device is configured to receive a first message sent by the mobility management entity, and notify the mobile switching center/visit location register MSC/VLR to release the circuit switched CS resource of the UE.

25. The communication system of claim 24, wherein:

The first device is configured to: after receiving the first message, send a second message to the MSC/VLR, to trigger the MSC/VLR to release the CS resource of the UE.

26. A communication system according to claim 24 or 25, characterized in that

When the first device confirms that the old SGSN/MME is associated with the MSC/VLR of the serving UE, the second device sends a second message to the MSC/VLR by default; or

The first MME/SGSN sends a second message to the MSC/VLR according to a preset trigger condition when the first SGSN/MME establishes a Gs/SGs association with the MSC/VLR.

27. A user equipment, comprising:

28. The user equipment of claim 27, wherein The receiving unit is specifically configured to receive an attach accept message sent by the new MME, where the attach accept message includes the attach type as a joint attachment or an EPS attachment; or

The receiving unit is specifically configured to receive a regional update accept message sent by the new MME, where the area update accept message includes the tracking area update type being a joint update or an EPS update.

The user equipment according to claim 27, further comprising: a determining unit, configured to determine that the current network does not support the CS service, and determine to camp on the current network; The determining unit determines that the current network does not support the CS service, and determines to send a third message to the second device when camping on the current network.

30. A communication device, comprising:

31. The communication device of claim 30, wherein

The sending unit is further configured to send a registration accept message to the UE, where the registration accept message includes an indication of a joint registration or an evolved packet domain EPS registration.

32. The communication device of claim 31, wherein

The sending unit is specifically configured to send an attach accept message to the MME, where the attach accept message includes the attach type as a joint attachment or an EPS attachment; or

The sending unit is specifically configured to send a regional update accept message to the MME, where the area update accept message includes the tracking area update type as a joint update or an EPS update.