WO2019029228A1

WO2019029228A1 - Method and device for processing voice service, and storage medium

Info

Publication number: WO2019029228A1
Application number: PCT/CN2018/088279
Authority: WO
Inventors: 李振东; 朱进国; 卢飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-08-11
Filing date: 2018-05-24
Publication date: 2019-02-14
Also published as: CN109392010A

Abstract

The present invention provides a method and device for processing a voice service, and a storage medium. The method comprises: after a user equipment switches from a first network to a second network, a mobility management entity (MME) performs location update of a circuit switched domain; the MME rejects a bearer establishment request for initiating a voice service.

Description

Voice service processing method and device, storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. PCT Application No.

Technical field

The present invention relates to the field of communications, and in particular, to a method and device for processing a voice service, and a storage medium.

Background technique

The 3rd Generation Partnership Project (3GPP) began to develop a fourth-generation Long Term Evolution (LTE) mobile communication system from R8. The main ones include:

The terminal (User Equipment, UE) accesses the 4G network through the wireless air interface and obtains the service. The terminal exchanges information through the air interface and the base station, and the mobility management of the non-access Strata and the core network through the non-access stratum signaling NAS (non-Access Stratum) Entity interaction information.

A 4G base station (RAN, Radio Access Network, eNB) is responsible for air interface resource scheduling and air interface connection management of the terminal accessing the network.

Mobile management entity: The core network control plane entity, which is mainly responsible for user authentication, authorization, and subscription checking, user mobility management, and Public Data Network (PDN) (Packet Data Networks, PDN) connection. And the maintenance of the bearer, the function of triggering paging in the idle state of the user.

Serving GW (S-GW): The core network user plane functional entity, which is mainly responsible for the interaction with the PDN GW in the case of roaming.

Packet Data Gateway (PDN GW, P-GW): The core network user plane function entity is the access point of the terminal accessing the PDN network. It is responsible for assigning user IP addresses, establishing, modifying and deleting bearers triggered by the network, and also having service quality. (Quality of Service, QoS) control charging and other functions, is the anchor point of the user in the 3GPP system, thus ensuring the IP address unchanged and ensuring business continuity. In the control and forwarding separation architecture, the P-GW is further divided into two parts, one is the control entity (PGW-C) and the other is the user plane entity (PGW-U). PGW-C is responsible for signaling control, and PGW-U is responsible for IP forwarding.

Home Subscription Server (HSS): stores the user's subscription information.

The Policy and charging control function (PCRF) is responsible for the formulation of policy decisions and charging rules. The PCRF provides network control rules based on traffic data flows, including traffic data flow detection, Gating Control, QoS control, and data flow based charging rules. The PCRF sends its formulated policies and charging rules to the P-GW for execution.

3GPP began researching the NextGen System in R14, which can be referred to as the 5G system. The main ones include:

A user equipment or a user equipment (UE) accesses the network through a next-generation wireless air interface and obtains services. The terminal exchanges information through air interfaces and base stations, and performs non-access layer signaling and common control plane functions of the core network and sessions. Control surface function interaction information.

The next-generation base station (NG RAN, Radio Access Network) is responsible for the air interface resource scheduling of the terminal access network and the connection management of the air interface. The next generation base station may be a new radio access technology (gNB) or an enhanced LTE technology (eLTE).

Session Management Function (SMF): interacts with the terminal, and is mainly responsible for processing the user's Packet Data Unit (PDU) session establishment, modification, and deletion requests, and selecting the User Plane function (UPF). ; establish a user plane connection between the UE and the UPF. The SMF and the Policy Control Function (PCF) together determine the QoS (Quality of Service) parameters of the session.

Access and Mobility Control Function (AMF): A common control plane function within the core network. A user usually has only one AMF, which is responsible for authentication, authorization, and subscription checking of the user to ensure that the user is a legitimate user; user mobility management, including location registration and temporary identity allocation; when the user initiates a PDU connection establishment request, select a suitable SMF; forwarding Non-Access Stratum (NAS) signaling between the UE and the SMF; forwarding Access Stratum (AS) signaling between the base station and the SMF.

UPF: Provides user plane processing functions, including data forwarding and QoS execution. UPF also provides user plane anchors when users move to ensure business continuity.

PCF: Provides the authorization function of resources, which is very similar to the PCRF of the 4G era.

Unified Data Management (UDM): Stores user subscription data, which is very similar to HSS in the 4G era.

The deployment of NextGen System (5GS) will begin to be deployed locally in hotspots such as downtown, commercial centers and more. When the UE accesses the 5G system, as the UE moves, the coverage of the 5G system is removed, and the UE is switched to the 4G system.

5G system and 2G, 3G system have no interface. In the initial stage of 5G deployment, the voice service cannot be provided in 5G, and when the LTE network does not support VoLTE, the UE attached to the 5G cannot fall back to the Circuit Switching (CS) network. For example, 2G, 3G networks) provide voice service services.

Summary of the invention

The embodiment of the invention provides a method and a device for processing a voice service.

According to an embodiment of the present invention, a method for processing a voice service is provided, including: after a user equipment switches from a first network to a second network, a Mobility Management Entity (MME) performs a location update of a circuit switched domain. The MME refuses to initiate a bearer setup request for the voice service.

According to another embodiment of the present invention, a processing apparatus for a voice service is provided, which is applied to a mobility management entity MME, and includes: an execution module, configured to perform circuit switching after the user equipment switches from the first network to the second network. The location update of the domain; the rejection module is configured to reject the bearer setup request for initiating the voice service.

According to another embodiment of the present invention, a processing apparatus for a voice service is provided, including: a first initiating module configured to initiate a tracking area update request to an MME after switching from a first network to a second network; or The first initiating module is configured to initiate a joint tracking area update request to the MME after switching from the first network to the second network.

According to still another embodiment of the present invention, a processing system for a voice service is provided, including: a mobility management entity MME, a user equipment, where the MME includes: an execution module, configured to be in the user equipment from a first network After the switch to the second network, the location update of the circuit switched domain is performed; the rejecting module is configured to reject the bearer setup request for initiating the voice service; the user equipment includes: a handover module configured to switch from the first network to the second network.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

After switching from the first network to the second network, the mobility management entity performs location update of the circuit switched domain;

A bearer establishment request for initiating a voice service is rejected.

After the user equipment is switched from the first network to the second network, the user equipment refuses to initiate a bearer setup request for the voice service, and if the host network refuses to establish a bearer setup request for the voice service after switching to the second network, the circuit domain is automatically triggered. The processing flow of the voice service can be provided, and at the same time, the network element of the second network is used, (the network element includes but not limited to the MME) to perform location update of the circuit switched domain, and the location update of the circuit switched domain can ensure the use of the circuit. The switching domain successfully provides the voice service, which can solve the technical problem that the user equipment cannot fall back from the first network to the CS network to receive voice in the related technology, and avoids the abnormality of the voice service under the 5G network.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a network architecture of 4G and 5G bidirectional handover according to an embodiment of the present invention;

2 is a schematic flowchart of a 5G to 4G handover according to an embodiment of the present invention;

3 is a schematic flowchart of a technical implementation of a Circuit Switched Fallback (CSFB) according to an embodiment of the present disclosure;

FIG. 4 is a flowchart of converting from a LTE voice (VoLTE) call process to a CSFB according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for processing a voice service according to an embodiment of the present invention; FIG.

FIG. 6 is a structural block diagram of a processing apparatus for a voice service according to an embodiment of the present invention; FIG.

7 is a schematic diagram 1 of the 5G falling back to 2G and 3G in the embodiment of the present invention;

FIG. 8 is a second schematic diagram of the 5G falling back to 2G and 3G in the embodiment of the present invention; FIG.

FIG. 9 is a third schematic diagram of the 5G falling back to 2G and 3G in the embodiment of the present invention.

Detailed ways

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

The embodiment of the present application can be run on the network architecture shown in FIG. 1 . FIG. 1 is a network architecture diagram of 4G and 5G bidirectional handover in the related art of the present invention. As shown in FIG. 1 , the network architecture includes: a network element such as an MME. Each network element is connected through an interface. The architecture is compatible with both 4G and 5G architectures. Its core feature is the combination of PGW-C and SMF, PGW-U and UPF are combined, PCF and PCRF are combined, and the user plane of UE is always anchored on UPF/PGW-U. Between the AMF and the MME, an Nx interface is added, and an inter-system handover request is sent on the interface. In this way, when the UE switches between LTE and 5G, seamless handover can be guaranteed.

2 is a flow chart of 5G to 4G handover in the related art of the present invention, and the following briefly introduces:

Step 100: The terminal UE has established a PDU session in the 5G system, and may establish a dedicated service quality flow (dedicated Qos flow);

Step 101: The source 5G RAN node finds that it needs to switch to 4G, and sends a handover request to the AMF, where the target cell information is carried;

Step 102: The AMF requests the SMF to correspond to the session information of the 4G.

Step 103: The AMF selects the target MME and sends a Forward Relocation Request (Forward Relocation Request).

Step 104: The MME sends a session establishment request (Create session request) to the S-GW.

Step 105: The MME sends a handover request to the eNB to request a radio resource.

Step 106, after receiving the eNB response, the MME sends a forward relocation response (Forward Relocation Response) to the AMF;

Step 107, the AMF sends a handover command (Handover command) to the 5G RAN node, and the 5G RAN node sends a Handover command to the UE;

Step 108, the UE accesses the 4G system, and sends a handover complete (Handover complete) message to the eNB;

Step 109, the eNB sends a handover notification to the MME;

In steps 110-114, the MME initiates a modify bearer request to the S-GW, and the S-GW sends the S-GW to the P-GW to complete the establishment of the media plane.

Steps 115 to 117, the UE performs a Tracking Area Update (TAU) in the 4G system, and provides a roaming number in the PRN (Provide roaming number).

In the LTE system, voice services are available in two ways, VOLTE (IMS voice) and CSFB (CS fallback). The latter method is a technique of backing off to the circuit domain when the LTE system to which the UE is attached does not provide VoIP. 3 is a schematic flowchart of a technical implementation of a CSFB according to an embodiment of the present invention. The mobile terminal (MT) (terminating) is taken as an example. The content is completely defined in the 3GPP protocol 23.272, and includes:

Step 301: The UE attaches to the LTE network, and performs a combined attach;

Step 302a: During the EPC attachment process, the MME performs location update to the HSS; this location update is a location update of a Packet Switching (PS) domain;

Step 302b: The MME selects an MSC, initiates a location update request to the MSC, and the MSC completes the location update to the HLR in the CS domain, and then returns a location update accept response to the MME.

Step 303: The initial call address IAM (IAM) arrives at the gateway MSC (GMSC);

Step 304: The GMSC sends a request routing information (SRI) to the HLR to query the routing information.

Step 305: The HLR requests a roaming number from the MSC.

Step 306: The HLR returns an SRI response to the GMSC, and carries the roaming number.

Step 307: The GMSC initiates the call by using the roaming number, and the calling IAM message arrives at the MSC. The MSC is associated to the UE by the called roaming number;

Step 308: The MSC sends a paging message to the MME.

Step 309: If the UE is in the idle state, the MME pages the UE, and the UE enters a connect state;

Step 310: The MME sends a CS service notification message to the UE.

Step 311: Complete the subsequent CSFB process. For the sake of simplicity, details will not be described again. For details, see 3GPP Protocol 23.272.

FIG. 4 is a schematic flowchart of a process for converting from a VoLTE call process to a CSFB according to an embodiment of the present invention. When a user equipment attaches to an LTE, a combined attach is performed, as shown in step 301, 302 of FIG. 3, and IMS registration is performed; In the case of establishing a bearer, the trigger circuit domain falls back to the CSFB process because the base station signal is not good. For the specific process, refer to related art 3GPP protocol 23.237;

Step 401: The P-CSCF (Proxy-Call Session Control Funtion) requests the resource reservation from the PCRF during the IMS call negotiation process.

Step 402: The PCRF sends an Internet Protocol (Connectivity Access Network, IP-CAN) modification request (IP-CAN modification request) to the P-GW;

Step 403: The P-GW sends a Create Bearer Request to the S-GW, and the S-GW forwards the change request to the MME.

Step 404: The MME requests the radio bearer resource from the eNB, and the eNB rejects the radio bearer establishment due to the radio signal problem;

Step 405: The MME sends a Create Bearer response to the S-GW, and the S-GW forwards the P-GW to the P-GW, where the NB refuses to establish a bearer indication.

Step 406: The P-GW returns an IP-CAN modification response to the PCRF, indicating that the bearer establishment fails.

Step 407: The PCRF returns a resource reservation response to the P-CSCF, indicating that the reservation fails.

Step 408: The P-CSCF/IMS triggers the CSFB process. When the UE is the calling party, the P-CSCF sends a SIP 503 message to the UE, triggering the UE to initiate a Mobile Origination (MO) CSFB procedure. If the UE is called, the SCC AS of the IMS network queries the HLR to request the roaming number, and the subsequent flow is the same as steps 304-311 of FIG.

In this embodiment, a method for processing a voice service is provided. FIG. 5 is a flowchart of a method for processing a voice service according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:

Step S502: After the user equipment is switched from the first network to the second network, the MME performs location update of the circuit switched domain, where the MME is a network element of the second network.

Step S504, the MME refuses to initiate a bearer setup request for the voice service.

If the MME refuses to initiate the bearer setup request for the voice service, the process of providing the voice service is automatically triggered, for example, the CSFB process is automatically triggered to implement the voice service. In this embodiment, the MME performs location update of the circuit switched domain to prepare for CSFB, thereby ensuring successful CSFB, so that after switching from the first network to the second network, voice service can be smoothly provided through CSFB. Avoid the problem that CSFB falls back to the wrong circuit-switched domain because the location is not updated, which may cause the voice service to fail to be provided after CSFB falls back, thus ensuring the normal and successful voice service.

After the user equipment is switched from the first network to the second network, the user equipment is refused to initiate a bearer setup request for the voice service, which solves the technical problem that the user equipment cannot fall back from the first network to the CS network to receive voice in the related art. The abnormality of the voice service under the 5G network is avoided.

In an embodiment, the execution body of the foregoing steps may be an MME or the like, but is not limited thereto.

In an embodiment, the MME performs location update of the circuit switched domain, including one of the following: the MME receives the tracking device update request initiated by the user equipment, and performs location update of the circuit switched domain; and the MME receives the joint tracking area update request initiated by the user equipment. And performing a location update of the circuit switched domain; or the MME performs a location update of the circuit switched domain before receiving the tracking area update initiated by the user equipment or the joint tracking area update request.

In an embodiment, the MME receives the tracking area update process initiated by the user equipment or the joint tracking area update request, and performs location update of the circuit switched domain, including:

S11. The MME receives one of the following information sent by the user equipment: a tracking area update request or a joint tracking area update request.

S12. The MME sends a location update request to the mobile switching center MSC.

S13. The MME receives a location update accept response returned by the MSC, where the location update accept response is returned by the MSC after the location update request location update is sent to the home location register in the circuit switched domain.

S14. The MME sends a tracking area update receiving response to the user equipment.

In an embodiment, the MME rejects the bearer setup request for initiating the voice service, including: after the MME receives the location update accept response sent by the MSC, sends a bearer response to the packet data gateway by using the serving gateway, where the bearer response carries the rejection Establishing a bearer indication of the voice service; or, the MME sends a bearer response to the packet data gateway by using the serving gateway, where the bearer response carries a bearer indication that the voice service is refused to be established.

In one embodiment, the location update of the circuit switched domain is performed in advance prior to the tracking area update process, including:

S21: After the user equipment completes the handover from the first network to the second network, the MME selects a Mobile Switching Center (MSC) to send a location update request to the MSC.

S22. The MME receives a location update accept response returned by the MSC, where the location update accept response is returned by the MSC after the location exchange request completion location update is sent to the home location register in the circuit switched domain.

The MME refuses to initiate a bearer setup request for voice services, including the following two types:

The MME receives the bearer setup request, the MME requests the radio base station to establish a radio bearer, the radio base station rejects the bearer setup request, and the MME rejects the bearer setup request; or the MME receives the bearer setup request, and the MME directly rejects the bearer setup request.

In an embodiment, the solution of this embodiment further includes: after the MME rejects the bearer setup request for initiating the voice service, the IP multimedia subsystem (IP multimedia subsystem) network triggers the user equipment circuit fall back (CS fall back) process.

In one embodiment, before the MME rejects the bearer setup request to initiate the voice service, the method further includes completing the location update of the circuit switched domain. Of course, it is also possible that during the location update process of performing the circuit switched domain, the MME refuses to initiate a bearer setup request for the voice service.

In this embodiment, the first network is a network that cannot provide voice services, such as a new radio access network, and the second network is a long-term evolution LTE access network. In some embodiments, the first network can be a next generation or multiple generation networks of the second network. For example, the first network is a 5G network, and the second network may be a 4G network. In some embodiments, the first network may also be another type of network, such as a 3G network. In summary, the first network and the second network are different types of networks. In some embodiments, the second network may be a network that cannot directly provide voice services. In this embodiment, the MME may be a network element of the second network.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.

In the embodiment, a processing device for the voice service is provided, and the device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein. As used hereinafter, the term "module" may implement at least one of the following functions: software, hardware. Although the devices described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 6 is a structural block diagram of a processing apparatus for a voice service according to an embodiment of the present invention. As shown in FIG. 6, the apparatus is applied to a mobility management entity MME, and the apparatus includes:

The executing module 60 is configured to perform location update of the circuit switched domain after the user equipment switches from the first network to the second network;

The reject module 62 is configured to reject the bearer setup request for initiating the voice service.

In one embodiment, the execution module includes one of: a first execution unit configured to receive a tracking area update request initiated by the user equipment, and perform a location update of the circuit switched domain;

a second execution unit, configured to receive a joint tracking area update request initiated by the user equipment, and perform location update of the circuit switched domain; and the third execution unit is configured to receive the tracking area update initiated by the user equipment or the joint tracking area update request , performing a location update of the circuit switched domain.

In an embodiment, the performing module receives the tracking area update process or the joint tracking area update request initiated by the user equipment, and the MME performs location update of the circuit switched domain, including: receiving one of the following sent by the user equipment: tracking area update request or Jointly tracking the area update request; transmitting a location update request to the mobile switching center MSC; receiving a location update accept response returned by the MSC, wherein the location update accept response is returned by the MSC after the location exchange request completion location update is sent to the home location register in the circuit switched domain Sending a tracking area update receiving response to the user equipment.

In an embodiment, the rejecting module includes: a first sending unit, configured to: after receiving the location update accepting response sent by the MSC, send a bearer response to the packet data gateway by using the serving gateway, where the bearer response carries the reject establishing voice The bearer indication of the service; or the second sending unit, configured to send, by using the serving gateway, a bearer response to the packet data gateway, where the bearer response to establish a bearer response carrying the voice service is established.

In an embodiment, the third execution unit is further configured to: after the user equipment completes the handover from the first network to the second network, select the MSC, send a location update request to the MSC; and receive a location update acceptance response returned by the MSC, where The location update accept response is returned by the MSC after the location exchange request completion location update is sent to the home location register in the circuit switched domain.

In an embodiment, the rejecting module includes one of the following: the requesting unit is configured to: after receiving the bearer setup request, request the radio base station to establish a radio bearer, the radio base station rejects the bearer setup request, rejects the bearer setup request; and the reject unit is configured as After receiving the bearer setup request, the bearer setup request is directly rejected.

In one embodiment, the apparatus further comprises: a determining module configured to determine that the location update of the circuit switched domain has been completed before the rejecting module rejects the bearer setup request to initiate the voice service.

In this embodiment, the first network is a new radio access network, and the second network is a long term evolution LTE access network.

The embodiment further provides another processing device for the voice service, which is applied to the user equipment, and includes: a first initiating module, configured to initiate a tracking area update request to the MME after switching from the first network to the second network; or The first initiating module is configured to initiate a joint tracking area update request to the MME after switching from the first network to the second network.

The embodiment further provides a processing system for a voice service, including: a mobility management entity MME, and a user equipment, where the MME includes: an execution module, configured to perform a circuit switched domain after the user equipment switches from the first network to the second network. Location update; a rejection module for rejecting a bearer setup request for initiating a voice service;

The user equipment includes a switching module configured to switch from the first network to the second network.

In an embodiment, the user equipment includes: a first initiating module configured to initiate a tracking area update request to the MME after switching from the first network to the second network; or a first initiating module, configured to switch from the first network After the second network, a joint tracking area update request is initiated to the MME.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

This embodiment is an optional embodiment according to the present invention, and is used to describe the present application in detail in conjunction with a specific embodiment:

The embodiment of the invention provides a method for the voice service to fall back to 2G and 3G, including:

After the UE is switched to the 4G system, in the TAU process, the MME needs to update the location of the CS domain, and the MME rejects the bearer setup request after completing the location update of the CS domain; or

After the UE is switched to the 4G system, the MME performs the location update of the CS domain for the UE in advance, and the MME rejects the bearer setup request after completing the location update of the CS domain.

FIG. 7 is a first schematic diagram of the 5G falling back to 2G and 3G in the embodiment of the present invention, including:

Step 501: The terminal UE switches from the 5G system to the 4G system, and the part is the same as steps 100-114 of FIG. 2;

Step 502: The P-GW sends a Create Bearer Request to the S-GW, and the S-GW sends a Create bearer request to the MME.

Step 503: The MME requests the eNB base station to establish a radio bearer.

Step 504: The eNB rejects the establishment of the radio bearer for the voice service because the 4G network cannot provide the voice service.

When the 4G network does not provide the voice service, the MME may also locally determine that the type of bearer cannot be established, and the MME does not need to send a bearer setup request to the eNB.

Step 505: After the handover is completed, the UE initiates a TAU request or a combined TAU Request, and the request is sent to an evolved base station (eNB); the process of the TAU here is the location of the foregoing circuit switched domain. An updated one;

Step 506: The eNB forwards a location update request (TAU request) to the MME.

Step 507: The MME performs an update location process on the HSS.

Step 508: The MME selects the MSC, and sends a Location Update Request to the MSC. The MSC sends a Location Update request to the HLR to complete the location update, and then returns a Location Update Accept response to the MME.

Step 509: The MME sends a TAU accept to the UE (TAU accept);

After receiving the location update accept sent by the MSC in step 508, the MME may send the message of step 510;

Step 510: The MME sends a Create Bearer response to the S-GW, and the S-GW forwards the packet to the P-GW, where the acknowledgment to establish the bearer indication is carried.

Step 511: The P-GW returns an IP-CAN modification response to the PCRF, indicating that the bearer establishment fails.

Step 512: The PCRF returns a resource reservation response to the P-CSCF, indicating that the reservation fails.

Step 513: The P-CSCF/IMS triggers the CSFB process. The step is the same as the step 408 in FIG. 4. When the UE is the calling party, the P-CSCF sends a SIP 503 message to the UE, triggering the UE to initiate the MO CSFB process. If the UE is called, the SCC AS of the IMS network queries the HLR to request the roaming number, and the subsequent flow is the same as steps 304-311 of FIG.

FIG. 8 is a schematic diagram 2 of the 5G falling back to the 2G and 3G in the embodiment of the present invention. In this solution, the MME may perform the location update of the CS domain for the UE in advance, so the location of the CS domain is not updated during the TAU process waiting for the UE to trigger. After the refusal of the bearer establishment;

Step 601: The terminal UE switches from the 5G system to the 4G system, and the part is the same as steps 100-114 of FIG. 2;

Step 602: After the handover is completed, the MME performs location update for the UE in the CS domain in advance. The MME selects the MSC, and sends a Location update request to the MSC. The MSC sends a Location Update request to the HLR to complete the location update in the CS domain, and then returns a Location Update Accept response to the MME.

Step 603: The P-GW sends a bearer setup request Create Bearer Request to the S-GW, and the S-GW sends a Create bearer request to the MME.

Step 604: The MME requests the eNB base station to establish a radio bearer.

Step 605: The eNB rejects the establishment of the radio bearer for the voice service because the 4G network cannot provide the voice service.

When the 4G network does not provide the voice service, the MME can also locally determine that the type of bearer cannot be established, and the MME does not need to send the bearer setup request to the eNB, but directly performs step 606;

Step 606: The MME sends a bearer setup response Create Bearer response to the S-GW, and the S-GW forwards the packet to the P-GW, where the refusal to establish a bearer indication is carried.

Step 607: The P-GW returns an IP-CAN modification response to the PCRF, indicating that the bearer establishment fails.

Step 608: The PCRF returns a resource reservation response to the P-CSCF, indicating that the reservation fails.

Step 609: After the handover is completed, the UE initiates a TAU request or a Combined TAU Request, and sends a request to the eNB; the step may be performed at any time after the step 601;

Step 610: The eNB forwards the TAU request to the MME.

Step 611: The MME performs an Update Location procedure on the HSS.

Step 612: The MME sends a TAU accept to the UE according to the result of steps 602 and 612.

Step 613: The P-CSCF/IMS triggers the CSFB process. The step is the same as the step 408 in FIG. 4. When the UE is the calling party, the P-CSCF sends a SIP 503 message to the UE, triggering the UE to initiate the MO CSFB process. If the UE is called, the SCC AS of the IMS network queries the HLR to request the roaming number, and the subsequent flow is the same as steps 304-311 of FIG.

FIG. 9 is a schematic diagram 3 of the 5G falling back to 2, 3G in the embodiment of the present invention, which may include:

Step 701: The terminal UE switches from the 5G system to the 4G system, and the part is the same as steps 100-114 of FIG. 2;

Step 702: The P-GW sends a Create Bearer Request to the S-GW, and the S-GW sends a Create bearer request to the MME.

Step 703: The MME requests the eNB base station to establish a radio bearer.

Step 704: The eNB rejects the establishment of the radio bearer for the voice service because the 4G network cannot provide the voice service.

Step 705: The MME sends a bearer setup request (Create Bearer response) to the S-GW, and the S-GW forwards the packet to the P-GW, where the bearer is configured to refuse to establish a bearer.

Step 706: The P-GW returns an IP-CAN modification response to the PCRF, indicating that the bearer establishment fails.

Step 707: The PCRF returns a resource reservation response to the P-CSCF, indicating that the reservation fails.

After step 701, step 708 can be performed at any time.

Step 708: After the handover is completed, the UE initiates a TAU request, or a Combined TAU Request, and the request is sent to the eNB.

Step 709: The eNB forwards the TAU request to the MME.

Step 710: The MME performs an Update Location procedure on the HSS.

Step 711: The MME selects the MSC, and sends a Location update request to the MSC. The MSC sends a Location Update request to the HLR to complete the location update in the CS domain, and then returns a Location Update Accept response to the MME.

Step 712: The MME sends a TAU accept to the UE.

Step 713: The P-CSCF/IMS triggers the CSFB process. The step is the same as the step 408 in FIG. 4. When the UE is the calling party, the P-CSCF sends a SIP 503 message to the UE, triggering the UE to initiate the MO CSFB process. If the UE is called, the SCC AS of the IMS network queries the HLR to request the roaming number, and the subsequent flow is the same as steps 304-311 of FIG.

Embodiments of the present invention also provide a storage medium. In an embodiment, in the embodiment, the foregoing storage medium may be configured to store a processing method for performing the voice service provided by any one of the foregoing technical solutions. For example, at least the program code that can perform the following steps is stored:

S1. Perform a location update of the circuit switched domain after the user equipment switches from the first network to the second network.

S2. Reject the bearer establishment request for initiating the voice service.

In an embodiment, in the embodiment, the foregoing storage medium may include, but not limited to, a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), and a mobile hard disk. A medium that can store program code, such as a magnetic disk or an optical disk, which can be selected as a non-transitory storage medium.

In an embodiment, in this embodiment, the processor performs a location update of the circuit switched domain after the user equipment switches from the first network to the second network according to the stored program code in the storage medium;

In one embodiment, in the present embodiment, the processor performs a bearer setup request to reject the initiated voice service based on the stored program code in the storage medium.

An embodiment of the present invention further provides a processing device for a voice service, including: a memory, and a processor coupled to the memory, the processor is configured to run a program, where the program is executed to perform the following steps code:

S2. Reject the bearer establishment request for initiating the voice service.

In an embodiment, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. In one embodiment, they may be implemented in program code executable by a computing device such that they may be stored in a storage device for execution by the computing device and, in some cases, may differ from here. The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

After switching from the first network to the second network in the embodiment of the present invention, if the second network cannot directly provide the voice service, the location update of the circuit switched domain that can provide the voice service is automatically performed, and the network element rejects the The bearer establishment request of the voice service of the second network, so that after the location update of the circuit switched domain, the voice service is provided based on the circuit switched domain after the location update, thereby realizing the provision of the voice service, thereby solving the problem from the first The problem of the network switching to the second network cannot provide voice services, has a positive industrial effect, and at the same time achieves a gradual change, and can be widely used in industry.

Claims

A method for processing a voice service, comprising:

After the user equipment switches from the first network to the second network, the mobility management entity MME performs location update of the circuit switched domain;

The MME rejects a bearer setup request for initiating a voice service.
The method of claim 1 wherein said MME performing a location update of the circuit switched domain comprises one of:

Receiving, by the MME, a tracking area update request initiated by the user equipment, and performing location update of the circuit switched domain;

The MME receives a joint tracking area update request initiated by the user equipment, and performs location update of the circuit switched domain.
The method according to claim 2, wherein the MME receives a tracking area update process or a joint tracking area update request initiated by the user equipment, and performs location update of the circuit switched domain, including:

The MME receives one of the following sent by the user equipment: a tracking area update request or a joint tracking area update request;

The MME sends a location update request to the mobile switching center MSC;

Receiving, by the MME, a location update accept response returned by the MSC, where the location update accept response is returned by the MSC after the circuit switch domain sends a location update request completion location update to the home location register;

The MME sends a tracking area update receiving response to the user equipment.
The method of claim 1, wherein the MME rejects a bearer setup request for initiating a voice service, including:

After the MME receives the location update accept response sent by the MSC, the serving gateway sends a bearer response to the packet data gateway, where the setup bearer response carries a bearer indication that the voice service is refused to be established; or

The MME sends a bearer response to the packet data gateway by using the serving gateway, where the setup bearer response carries a bearer indication that the voice service is refused to be established.
The method of claim 2, wherein performing a location update of the circuit switched domain in advance of the tracking area update process comprises:

After the user equipment completes the handover from the first network to the second network, the MME selects the MSC to send a location update request to the MSC;

The MME receives a location update accept response returned by the MSC, wherein the location update accept response is returned by the MSC after the circuit switch domain sends a location update request completion location update to the home location register.
The method of claim 1, wherein the MME rejects a bearer setup request for initiating a voice service, including:

Receiving, by the MME, a bearer setup request, the MME requests the radio base station to establish a radio bearer, the radio base station rejects the bearer setup request, and the MME rejects the bearer setup request; or

The MME receives the bearer setup request, and the MME directly rejects the bearer setup request.
The method of claim 1 wherein the method further comprises:

After the MME rejects the bearer setup request for the voice service, the IP multimedia subsystem network triggers the user equipment circuit domain fallback process.
The method of claim 1, wherein before the MME rejects the bearer setup request for initiating the voice service, the method further includes:

It is determined that the location update of the circuit switched domain has been completed.
A method according to any one of claims 1-8, wherein

The first network is a new radio access network, and the second network is a long term evolution LTE access network.
The method of claim 1, wherein the performing, by the MME, the location update of the circuit switched domain comprises:

The MME performs location update of the circuit switched domain before receiving the tracking area update or the joint tracking area update request initiated by the user equipment.
A processing device for a voice service, comprising:

An execution module, configured to perform a location update of the circuit switched domain after the user equipment switches from the first network to the second network;

The reject module is configured to reject the bearer setup request for initiating the voice service.
The apparatus of claim 11 wherein said execution module comprises one of:

a first execution unit, configured to receive a tracking area update request initiated by the user equipment, and perform location update of the circuit switched domain;

The second execution unit is configured to receive a joint tracking area update request initiated by the user equipment, and perform location update of the circuit switched domain.
The apparatus of claim 11, wherein the execution module comprises: a third execution unit configured to perform a location update of the circuit switched domain prior to receiving a tracking area update initiated by the user equipment or a joint tracking area update request.
The apparatus of claim 11 wherein said rejecting module comprises:

The first sending unit is configured to: after receiving the location update accepting response sent by the MSC, send a bearer response to the packet data gateway by using the serving gateway, where the establishing bearer response carries a bearer indication that the voice service is refused to be established;

And a second sending unit, configured to send, by using the serving gateway, a bearer response to the packet data gateway, where the establishing bearer response carries a voice service denial establishment bearer indication.
A processing device for a voice service, comprising:

The first initiating module is configured to initiate a joint tracking area update request to the MME after switching from the first network to the second network.
A storage medium, wherein the storage medium comprises a stored program, wherein the program is executed to perform the method of any one of claims 1 to 10.
A processing device for a voice service, comprising: a memory, and a processor coupled to the memory, the processor for running a program, wherein the program is executed to perform any one of claims 1 to 10 Said method.