WO2019037604A1

WO2019037604A1 - Communication method, related device and system

Info

Publication number: WO2019037604A1
Application number: PCT/CN2018/099712
Authority: WO
Inventors: 张彪
Original assignee: 华为技术有限公司
Priority date: 2017-08-21
Filing date: 2018-08-09
Publication date: 2019-02-28
Also published as: CN109429328A; CN109429328B

Abstract

In embodiments of the present invention, an AMF device receives a federated registration request of user equipment, the federated registration request carrying location information of the user equipment in a 5G network. The registration of the user equipment in the 5G network is completed according to the federated registration request. After the registration in the 5G network is completed, a federated location update request is sent to a mobile switching center (MSC) of a circuit switched network, the federated location update request carrying the location information of the user equipment in the 5G network and the identifier of the AMF; then a federated location update reception message sent by the MSC is received, the federated location update reception message carrying a temporary identifier assigned to the user equipment by a CS network; and a registration reception message is sent to the user equipment, the registration reception message carrying the temporary identifier assigned to the user equipment by the CS network, thereby completing the registration of the user equipment in the CS network. After the registration succeeds, the user equipment can subsequently use the temporary identifier to make a voice call in the CS network.

Description

Communication method, related device and system

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. .

Technical field

The present invention relates to the field of communications technologies, and in particular, to a communication method, related apparatus, and system.

Background technique

The fifth-generation (5th generation, 5G) network is a next-generation network that network operators hope to deploy, which has high-rate and low-latency characteristics. In a 5G network, the voice service can be transmitted through an Internet Protocol (IP), for example, by Voice over Long Term Evolution (VoLTE).

However, some network operators have not deployed a VoLTE network based on IP Multimedia Subsystem (IMS) technology. User equipment cannot be registered in the VoLTE network, and voice calls under the 5G network cannot be realized.

Summary of the invention

The embodiment of the invention provides a communication method, a related device and a system, which can implement a voice call under a 5G network.

In an aspect, an embodiment of the present invention provides a communication method, which is applied to an AMF device, and includes the following steps:

Receiving the joint registration request of the user equipment, where the joint registration request carries the location information of the user equipment on the 5G network; in addition, the joint registration request may further carry the identifier of the user equipment.

The AMF device also completes registration of the user equipment on the 5G network according to the joint registration request. After the registration of the 5G network is completed, the joint location update request is sent to the mobile switching center MSC of the circuit switched network, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried, and then the association sent by the MSC is received. a location update accept message, where the joint location update accept message carries a temporary identifier assigned by the CS network to the user equipment, and sends a registration accept message to the user equipment, where the CS network is carried as the user equipment The temporary identifier is assigned to complete the registration of the user equipment on the CS network. After the registration is successful, the user equipment can subsequently use the temporary identifier to make a voice call on the CS network.

In a possible solution, the location information of the user equipment in the 5G network includes an identifier of the user equipment in a cell of the 5G network.

In a possible solution, the joint location update accept message and the registration accept message further carry a location area identifier allocated by the CS network to the user equipment, so that the RAN device of the CS network can identify by using the location area. Paging the user equipment to find the user equipment.

In a possible solution, the AMF device further receives a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to initiate a voice call, and then The user equipment sends an indication message that falls back to the CS network, indicating that the user equipment falls back to the CS network to initiate a voice call.

In a possible solution, the AMF device further receives a paging request message sent by the MCS of the CS network, where the paging request message carries the identifier of the user equipment; and according to the identifier of the user equipment, the user equipment Sending a paging message, paging the user equipment; and subsequently receiving a NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to make a voice call; The mobile switching center of the CS network sends a notification message to notify the MSC that the user equipment needs to fall back to the CS network to make a voice call. The notification message may also carry information that the user equipment is idle, so that the MSC can know the connection status of the call, for example, the call is being connected.

In a possible solution, the AMF device further sends an initial context setup request message to the wireless access device of the 5G network, informing the wireless access device to establish an initial context for the user equipment, thereby switching the CS to the user equipment. The network is ready on the RAN side.

In a possible solution, the AMF device further receives a registration completion message sent by the user equipment, and then sends a temporary identity re-allocation success message to the MSC to notify the MSC user equipment that the joint registration is completed.

In a second aspect, an embodiment of the present invention provides a communication method, which is mainly applied to a mobile switching center MSC of a circuit-switched CS network, and includes:

Receiving a joint location update request sent by the access and mobility management function AMF device, carrying location information of the user equipment in the 5G network and the identifier of the AMF; and updating the user to the home location register HLR in the CS network a location of the device, the temporary identifier of the CS network is allocated to the user equipment; and then a joint location update accept message is sent to the AMF corresponding to the identifier of the AMF, where the joint location update accept message carries the CS network as a location The temporary identifier that is allocated by the user equipment is received; the temporary identifier re-allocation complete message sent by the AMF is received, and the joint registration of the user equipment is completed. After the registration is completed, the MSC may send the called party for the user equipment to the user equipment. Answer.

In a possible solution, the MSC further allocates a location area identifier to the user equipment, and the joint location update accept message further carries a location area identifier allocated by the CS network to the user equipment.

In a possible solution, the MSC further receives a called request from the CS network for the user equipment; and sends a paging request message to the AMF corresponding to the identifier of the AMF, requesting the AMF paging. And receiving, by the user equipment, the notification message sent by the AMF, to notify the MSC that the user equipment needs to fall back to the CS network to make a voice call, so that the MSC can notify the called party that the called party request is being connected.

In a possible solution, the MSC further receives a paging response message sent by the user equipment, and rings the calling party that sends the called request to notify the calling user.

In a third aspect, the embodiment of the present invention further provides an access and mobility management function AMF device, including: a receiving module, configured to receive a joint registration request of the user equipment, where the joint registration request carries the user Location information of the device on the 5G network;

a registration module, configured to complete registration of the user equipment in the 5G network according to the joint registration request; and a joint update module, configured to send a joint location update request to the mobile switching center MSC of the circuit switched network after the registration of the 5G network is completed And carrying the location information of the user equipment on the 5G network and the identifier of the AMF. The receiving module is further configured to receive a joint location update accept message sent by the MSC, where the joint location update accept message carries a temporary identifier that is allocated by the CS network for the user equipment; and the AMF device further includes a sending module. And sending a registration accept message to the user equipment, where the CS network carries a temporary identifier allocated by the CS network.

In a possible solution, the receiving module in the AMF device is further configured to receive a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the The CS network initiates a voice call; the sending module is further configured to send, to the user equipment, an indication message that falls back to the CS network, indicating that the user equipment falls back to the CS network to initiate a voice call.

In a possible solution, the receiving module in the AMF device is further configured to receive a paging request message sent by an MCS of the CS network, where the paging request message carries an identifier of the user equipment;

The AMF device further includes a paging module, configured to send a paging message to the user equipment according to the identifier of the user equipment, and page the user equipment; in addition, the receiving module is further configured to receive the user equipment. The sent NAS extended service request message, the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to perform a voice call, and the sending module is further configured to send a notification message to the MSC to notify the MSC The user equipment needs to fall back to the CS network to make a voice call.

In a possible solution, the sending module in the AMF device is further configured to send an initial context setup request message to the wireless access device of the 5G network, to notify the wireless access device to establish an initial context for the user equipment. .

In a fourth aspect, an embodiment of the present invention provides a mobile switching center, which mainly includes:

a receiving module, configured to receive a joint location update request sent by the access and mobility management function AMF device, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried; and an update module is configured to be used in the CS network The home location register HLR updates the location of the user equipment, assigns the temporary identifier of the CS network to the user equipment, and the sending module is configured to send a joint location update accept message to the AMF corresponding to the identifier of the AMF. The joint location update accept message carries a temporary identifier allocated by the CS network to the user equipment. The receiving module is further configured to receive the temporary identifier re-allocation complete message sent by the AMF, and the joint registration of the user equipment is completed.

In a possible solution, the receiving module in the mobile switching center is further configured to receive a called request for the user equipment from the CS network; the mobile switching center further includes a paging request module, configured to The AMF corresponding to the identifier of the AMF sends a paging request message, requesting the AMF to page the user equipment; the receiving module is further configured to receive the notification message sent by the AMF, and notify the user of the mobile switching center The device needs to fall back to the CS network for voice calls.

In a possible solution, the mobile switching center further includes a receiving module, configured to receive a paging response message sent by the user equipment, where the mobile switching center further includes a ringing module, configured to request the corresponding The caller rings.

In a fifth aspect, an embodiment of the present invention provides a general-purpose computer, which can be applied to the AMF device provided by the third aspect, and can also be applied to the mobile switching center provided by the fourth aspect, where the general-purpose computer includes a memory and processes. , input and output devices, etc. The program code is stored in the memory, and the processor can acquire and execute the program code stored in the memory, so that the general computer can execute the communication method of the first aspect or the second aspect. For the specific implementation process, refer to the first aspect. And the second aspect.

According to a sixth aspect, an embodiment of the present invention provides a communication system, including the AMF device of the third aspect and the mobile switching center of the fourth aspect. The specific functions of the AMF device and the specific functions of the mobile switching center device are described in the above specific embodiments.

In an embodiment provided by any of the above aspects, the location information of the user equipment in the 5G network includes an identifier of the user equipment in a cell of the 5G network. The MSC also allocates a location area identifier in the CS network to the user equipment, and the joint location update accept message and the registration accept message further carry the location area identifier allocated by the CS network to the user equipment.

In an embodiment provided by any of the above aspects, the joint location update request further carries a 5G network location update type, where the 5G network location update type includes an initial registration or a location area update. The user equipment initiates the above registration process when the user equipment is powered on or first accesses the operator network. The user equipment may also initiate the registration process as described above when the location area update is detected. Therefore, the CS network can obtain the location information of the user equipment in time, and send it to the user equipment when there is a called party for the user equipment.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work. among them:

1 is a schematic diagram of networking of a communication system according to Embodiment 1 of the present invention;

2 is a flowchart of a communication method according to Embodiment 2 of the present invention;

3 is a flowchart of a communication method according to Embodiment 3 of the present invention;

4 is a hardware structural diagram of an AMF device and a mobile switching center according to Embodiment 4 of the present invention;

5 is a schematic structural diagram of an AMF device according to Embodiment 5 of the present invention;

FIG. 6 is a schematic structural diagram of a mobile switching center according to Embodiment 5 of the present invention.

Detailed ways

In the embodiment of the present invention, the network operator may provide different algebraic networks, such as a second generation (2G) network, a third generation (3G) network, and the 2G network includes but is not limited to a global system for mobile communications. , GSM), GSM Evolution Enhanced Data Rate Network (EDGE), Code Division Multiple Access (CDMA), and personal handy phone system (PHS) networks, 3G networks include, but are not limited to, Code Division Multiple Access 2000 (CDMA2000), Universal Mobile Telecommunications System (UMTS), and Time Division-Synchronous Code Division (Time Division-Synchronous Code Division). Multiple Access, TD-SCDMA) network. Both 2G networks and 3G networks belong to circuit switched (CS) networks. After the network operator deploys the 5G network, the 2G network and the 3G network can coexist with the 5G network. After the 5G network is deployed in the embodiment of the present invention, the call initiated or received by the user on the 5G network will continue to be connected in the CS network (2G network and 3G network). The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

The present invention provides a communication method, a related device, and a system. Referring to FIG. 1, FIG. 1 is a schematic diagram of networking of a communication system according to Embodiment 1 of the present invention.

As shown in FIG. 1, the communication system of the present invention includes a user equipment (UE), a next generation radio access network (NG-RAN) device that connects the user equipment to the 5G network, and The user equipment accesses the GSM/EDGE Radio Access Network (GERAN) of the GSM network, and connects the user equipment to the UMTS Terrestrial Radio Access Network (UTRAN) of the UMTS network. An access and mobility management function (AMF) device for mobility management of user equipment accessing a 5G network, and a mobile switching center for providing voice call service or short message service to user equipment (mobile switching center) , MSC) equipment. The function of the mobile switching center device may be implemented by an MSC server (MSC Server) and a Visitor Location Register (VLR). The NG-RAN device may also be referred to as a 5G RAN device, and the MSC device may be further referred to as an MSC, and the AMF device may be further referred to as AMF.

In this embodiment, the GERAN device can interact with the MSC through the A interface, for example, signaling the Base Station Subsystem Application Part (BSSAP). The UTRAN device can interact with the MSC through the IU-CS interface, such as signaling the Radio Access Network Application Part (RANAP). The AMF can interact with the MSC through the NSGs interface, for example, to deliver messages such as joint location update, paging, and the like of the UE. Of course, the AMF can also interact with the MSC through other customizations, which is not limited by the embodiment of the present invention.

In the embodiment of the invention, the UE supports access to the 5G network, and can also support access to the 2G/3G network at the same time. The UE is registered to the 5G network within the NG-RAN coverage. When the UE needs voice service (initiating or receiving voice service), the UE falls back to GERAN or UTRAN to process the voice service, thereby avoiding the cost pressure of deploying the VoLTE network. To save resources of network operators.

In the embodiment of the present invention, the UE needs to fall back to the CS network to process the call of the UE. Therefore, after the NG-RAN is registered, the UE also needs to initiate a joint location update to the CS network. The communication method provided by the second method (specifically, the user equipment registration method) specifically includes the following steps:

Step 201: The AMF receives the joint registration request sent by the UE, and completes the registration process of the UE in the 5G network.

In this embodiment, the UE may send a joint registration request to the AMF after the power is turned on, where the current location information of the UE, such as the identifier (cell ID) of the 5G cell currently camped on by the UE, is carried. The AMF completes the registration process of the UE and sends the location information of the UE to a device that stores user data, such as a User Data Management (UDM) device or other device. In addition, the joint registration request also carries information such as the circuit-switched fallback (CSFB) feature and the identifier of the user equipment.

In this embodiment, the identifier of the user equipment may be the device identifier of the specific user terminal, and may also be the identifier of the user.

Step 202: The AMF sends a joint location update request to the MSC, where the location information of the UE is carried.

In the embodiment of the present invention, after completing the registration of the 5G network, the AMF may send a joint location update request to the MSC in the CS network, and the address information of the UE may indicate that the current 5G network location update is performed. The joint location update request may also carry an AMF identifier, such as the name or IP address of the AMF. The joint location update request may also carry the identifier of the user equipment.

Step 203: The MSC saves the identifier of the AMF, and updates the location information of the UE to the home location register (HLR) of the CS network.

Step 204: After completing the location update of the CS network, the MSC responds to the joint location update accept message to the AMF, indicating that the location update of the UE in the CS network is completed.

Step 205: The AMF receives the joint location update accept message sent by the MSC, and sends a registration accept message to the UE.

The registration acceptance message indicates that the registration of the UE has been accepted by the AMF, and the acceptance message carries the temporary identifier of the UE in the CS network (for example, temporary mobile subscriber identity (TMSI)) and the location area identifier, which also indicates that the NSGs interface is established. Upon success, the subsequent MSC can page the UE through the NSGs interface, thereby preparing for subsequent possible voice service and short message service.

In the embodiment of the present invention, after receiving the registration accept message, the UE may further send a registration completion message to the AMF, and after receiving the registration completion message, the AMF sends a temporary identity re-allocation complete message to the MSC, thereby completing the registration process of the UE.

It should be noted that the foregoing registration process is triggered during the startup process of the UE, but the UE may also periodically trigger the registration process, for example, every 24 hours. In addition, the UE may also trigger the registration process when it detects that the location area (LA) is updated.

After the UE completes the above registration process, the voice call can be implemented through the CS network. The specific process can continue to refer to FIG. 2.

The user initiates a voice service call request by using the UE. The communication method (specifically, the call processing method) provided by the embodiment of the present invention includes the following steps:

Step 206: The UE sends a non-access stratum (NAS) extended service request message to the AMF, indicating that the AMF needs to make a voice call on the CS network.

In this embodiment, the UE is the calling party in the voice call.

Step 207: The AMF receives the NAS extended service request message, and determines that the UE needs to initiate a voice call on the CS network, and then sends an indication message of the fallback CS network to the UE, instructing the UE to fall back to the CS network.

Step 208: The UE redirects or switches from the NG-RAN to the CS network, thereby accessing the CS network through the GERAN or the UTRAN.

After the UE switches to the CS network, the AMF releases the network resources occupied by the UE in the NG-RAN.

Step 209: The UE initiates a voice call procedure on the CS network. For example, the UE sends a call request message to the MSC, where the called number is carried.

In the embodiment of the present invention, by reducing the voice call of the user to the CS network, the existing CS network can be fully utilized, thereby saving network investment.

In the embodiment of the present invention, the UE can receive a call in the CS network in addition to the NG-RAN falling back to the CS network to initiate a voice call. Referring to FIG. 3, FIG. 3 is a flowchart of a communication method (specifically, a call processing method) according to Embodiment 3 of the present invention.

In this embodiment, the UE currently camps in the NG-RAN, and the MSC in the CS network receives a call request from other users for the UE. The call processing method provided by the embodiment of the present invention includes the following steps:

Step 301: The MSC determines that the UE performs the joint location update, and sends a paging request message to the AMF corresponding to the UE.

When the UE initiates joint registration with the AMF, the AMF sends a joint location update request to the MSC, where the request carries the identifier of the AMF. Therefore, after receiving the call for the UE, the MSC may determine that the UE performs joint location update (or determine that the UE performs joint registration), and sends a paging request message to the AMF according to the saved AMF identifier.

Step 302: The AMF receives the paging request message, and sends a paging message to the UE through the NG-RAN to notify the UE that a call comes in.

Step 303: The UE receives the paging message and determines that the CS network needs to answer the call, and then sends a NAS extended service request message to the AMF, indicating that the AMF needs to make a voice call on the CS network.

Step 304: The AMF receives the NAS extended service request message, and determines that the UE needs to initiate a voice call on the CS network, and sends a service request message to the MSC, informing the MSC that the UE will fall back to the CS network to make a call.

In the embodiment of the present invention, the NAN extended service request message carries the NG-RAN cell identifier, indicating that the UE will fall back from the NG-RAN to the CS network.

The service request message sent by the AMF to the MSC may also notify the MSC that the UE is currently in an idle state. After receiving the service request message, the MSC may notify the calling user that the current call is in progress, and the MSC stops sending the paging request message to the AMF. .

Step 305: The AMF sends an initial UE context setup message to the NG-RAN, requesting to establish a context of the initial UE.

The purpose of establishing an initial UE context is to drop the UE back to the CS network. The message may carry parameters such as indication information of the CS network fallback, location area identifier, and the like.

Step 306: The UE redirects or switches from the NG-RAN to the CS network, thereby accessing the CS network through the GERAN or the UTRAN.

After the establishment of the context of the initial UE is completed, the UE may fall back to the CS network. After the UE switches to the CS network, the AMF may release the network resources occupied by the UE in the NG-RAN.

Step 307: The UE sends a paging response message to the MSC in the CS network, and responds to the paging request of the MSC.

After receiving the paging response returned by the UE, the MSC can connect to the called party, and the UE performs a voice call on the CS network, and completes the process of dropping the NG-RAN UE to the CS network to connect to the called party.

Referring to FIG. 4, FIG. 4 is a hardware structural diagram of an AMF device and a mobile switching center according to Embodiment 4 of the present invention.

The general-purpose computer shown in FIG. 4 may be the AMF device shown in FIG. 1 or the MSC device in FIG. 1. The AMF device or MSC can each employ general purpose computer hardware including a processor 401, a memory 402, a bus 403, an input device 404, an output device 405, and a network interface 406.

In particular, memory 402 can include computer storage media in the form of volatile and/or nonvolatile memory, such as read only memory and/or random access memory. Memory 402 can store operating systems, applications, other program modules, executable code, and program data.

Input device 404 can be used to input commands and information to an AMF device or MSC, such as a keyboard or pointing device such as a mouse, trackball, touch pad, microphone, joystick, game pad, satellite television antenna, scanner, or the like. device. These input devices can be connected to the processor 401 via a bus 403.

The output device 405 can be used for AMF device or MSC output information. In addition to the monitor, the output device 405 can also be used for other peripheral outputs, such as speakers and/or printing devices, which can also be connected to the processing via the bus 403. 401.

The AMF device or MSC can be connected to the network via a network interface 406, such as to a Local Area Network (LAN). In a networked environment, computer-executed instructions stored in an AMF device or MSC can be stored in a remote storage device without being limited to local storage.

When the processor 401 in the AMF device executes the executable code or the application stored in the memory 402, the AMF device may perform the method steps on the AMF device side in the second embodiment and the third embodiment, for example, performing steps 201-202. , 302, 304, etc. For the specific implementation process, refer to the foregoing Embodiment 2 and Embodiment 3, and details are not described herein again.

When the processor 401 in the MSC executes the executable code or the application stored in the memory 402, the MSC may perform the method steps on the MSC side in the second embodiment and the third embodiment, for example, performing steps 203-204, 301, and the like. . For the specific implementation process, refer to the foregoing Embodiment 2 and Embodiment 3, and details are not described herein again.

Referring to FIG. 5, FIG. 5 is a schematic structural diagram of an AMF device according to Embodiment 5 of the present invention.

As shown in the figure, the AMF device provided by the embodiment of the present invention includes:

The receiving module 510 is configured to receive a joint registration request of the user equipment, where the joint registration request carries location information of the user equipment in a 5G network.

The registration module 520 is configured to complete registration of the user equipment in the 5G network according to the joint registration request;

The joint update module 530 is configured to send a joint location update request to the mobile switching center MSC of the circuit switched network after the registration of the 5G network is completed, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried therein; The location information of the user equipment in the 5G network includes the identifier of the user equipment in the cell of the 5G network.

The receiving module is further configured to receive a joint location update accept message sent by the MSC, where the joint location update accept message carries a temporary identifier that is allocated by the CS network to the user equipment;

The sending module 540 is configured to send a registration accept message to the user equipment, where the temporary identifier that is allocated by the CS network to the user equipment is carried. In addition, the joint location update accept message and the registration accept message further carry a location area identifier allocated by the CS network to the user equipment.

In addition, the joint location update request further carries a 5G network location update type, where the 5G network location update type includes an initial registration or a location area update, and the AMF device notifies the MSC of the current user equipment location update by using the update type parameter. Types of.

In the AMF device provided in this embodiment, the receiving module 510 is further configured to receive a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network. Initiating a voice call; wherein the sending module 540 is further configured to send an indication message that the user equipment falls back to the CS network, indicating that the user equipment falls back to the CS network to initiate a voice call.

In the AMF device provided in this embodiment, the receiving module 510 is further configured to receive a paging request message sent by the MCS of the CS network, where the paging request message carries an identifier of the user equipment.

The AMF device further includes a paging module 550, configured to send a paging message to the user equipment according to the identifier of the user equipment, and page the user equipment. In addition, the receiving module 510 is further configured to receive the user equipment. The sent NAS extended service request message, the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to perform a voice call, and the sending module 540 is further configured to send a notification message to the MSC to notify the MSC The user equipment needs to fall back to the CS network for voice calls.

In addition, the sending module 540 in the AMF device is further configured to send an initial context setup request message to the wireless access device of the 5G network, to notify the wireless access device to establish an initial context for the user equipment.

In this embodiment, the AMF device is presented in the form of a functional module. A "module" herein may refer to an application-specific integrated circuit (ASIC), circuitry, a processor and memory that executes one or more software or firmware programs, integrated logic circuitry, and/or other functions that provide the functionality described above. Device. In a simple embodiment, those skilled in the art will appreciate that the AMF device can also take the form shown in FIG. The functions implemented by the receiving module 510, the registration module 520, the joint update module 530, the sending module 540, and the paging module 550 can all be implemented by the processor 401 and the memory 402 in FIG. For example, the function of receiving the joint registration request of the user equipment by the receiving module 510 can be implemented by the processor 401 executing the code stored in the memory 402.

Referring to FIG. 6, FIG. 6 is a schematic structural diagram of a mobile switching center MSC according to Embodiment 6 of the present invention.

As shown in the figure, the MSC provided by the embodiment of the present invention includes:

The receiving module 610 is configured to receive a joint location update request sent by the access and mobility management function AMF device, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried; the location information of the user equipment in the 5G network includes The identifier, latitude and longitude, and the like of the cell of the user equipment in the 5G network.

An update module 620, configured to update a location of the user equipment to a home location register HLR in the CS network, and allocate a temporary identifier of the CS network to the user equipment;

The sending module 630 is configured to send a joint location update accept message to the AMF corresponding to the identifier of the AMF, where the joint location update accept message carries the temporary identifier allocated by the CS network for the user equipment.

The receiving module 610 is further configured to receive the temporary identifier re-allocation complete message sent by the AMF, and the joint registration of the user equipment is completed.

The mobile switching center provided by the embodiment of the present invention further includes an allocation module 640, configured to allocate a location area identifier to the user equipment, and the joint location update accept message sent by the sending module 630 further carries the location area identifier.

In the mobile switching center provided by the embodiment of the present invention, the receiving module 610 is further configured to receive a called request for the user equipment from the CS network. At this time, the mobile switching center further includes a paging requesting module 650, configured to send a paging request message to the AMF corresponding to the identifier of the AMF, requesting the AMF to page the user equipment, and the receiving module 610 is further configured to receive the The notification message sent by the AMF notifies the user equipment of the mobile switching center that the user equipment needs to fall back to the CS network to make a voice call.

In the mobile switching center provided by the embodiment of the present invention, the receiving module 610 is further configured to receive a paging response message sent by the user equipment, where the mobile switching center further includes a ringing module 660, configured to respond to the called request The caller is ringing.

The MSC provided by the embodiment of the present invention can be used in the foregoing Embodiments 1, 2, and 3. The receiving module 610, the updating module 620, the sending module 630, the allocating module 640, the paging requesting module 650, and the ringing module 660 are provided. The method steps performed by the MSC in the second embodiment and the third embodiment are completed. Compared with the MSC in the prior art, the MSC provided in this embodiment has the same beneficial effects as the foregoing method embodiment when performing the user equipment joint registration and call processing procedure. For details, refer to the description of the foregoing method embodiment.

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Thus, aspects of the invention, or possible implementations of various aspects, may be in the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.), or a combination of software and hardware aspects, They are collectively referred to herein as "circuits," "modules," or "systems." Furthermore, aspects of the invention, or possible implementations of various aspects, may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The above is only a 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 claims.

Claims

A communication method, applied to an access and mobility management function AMF device, comprising:

Receiving a joint registration request of the user equipment, where the joint registration request carries location information of the user equipment in a 5G network;

Performing registration of the user equipment on the 5G network according to the joint registration request;

After the registration of the 5G network is completed, sending a joint location update request to the mobile switching center MSC of the circuit switched network, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried;

Receiving a joint location update accept message sent by the MSC, where the joint location update accept message carries a temporary identifier allocated by the CS network to the user equipment;

Sending a registration accept message to the user equipment, where the temporary identifier assigned by the CS network to the user equipment is carried.
The method according to claim 1, wherein the location information of the user equipment in the 5G network comprises an identifier of the user equipment in a cell of the 5G network.
The method according to claim 1 or 2, wherein the joint location update accept message and the registration accept message further carry a location area identifier assigned by the CS network to the user equipment.
The method according to claim 1, wherein the joint location update request further carries a 5G network location update type, and the 5G network location update type includes an initial registration or a location area update.
The method of claim 1 further comprising:

Receiving a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to initiate a voice call;

Sending an indication message falling back to the CS network to the user equipment, instructing the user equipment to fall back to the CS network to initiate a voice call.
The method of claim 1 or 2, further comprising:

Receiving a paging request message sent by the MCS of the CS network, where the paging request message carries an identifier of the user equipment;

Sending a paging message to the user equipment according to the identifier of the user equipment, and paging the user equipment;

Receiving a NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to perform a voice call;

Sending a notification message to the mobile switching center of the CS network to notify the MSC that the user equipment needs to fall back to the CS network to make a voice call.
The method of claim 6 further comprising:

And sending an initial context setup request message to the wireless access device of the 5G network, to notify the wireless access device to establish an initial context for the user equipment.
A communication method, applied to a mobile switching center MSC of a circuit switched CS network, comprising:

Receiving a joint location update request sent by the access and mobility management function AMF device, where the location information of the user equipment on the 5G network and the identifier of the AMF are carried;

Updating a location of the user equipment to a home location register HLR in the CS network, and assigning a temporary identifier of the CS network to the user equipment;

And sending, to the AMF corresponding to the identifier of the AMF, a joint location update accept message, where the joint location update accept message carries a temporary identifier allocated by the CS network to the user equipment;

Receiving the temporary identity re-allocation complete message sent by the AMF, the joint registration of the user equipment is completed.
The method according to claim 8, wherein the location information of the user equipment in the 5G network comprises an identifier of the user equipment in a cell of the 5G network.
The method according to claim 8 or 9, wherein the MSC further allocates a location area identifier to the user equipment, and the joint location update accept message further carries the CS network to allocate the user equipment. Location area ID.
The method of claim 8 further comprising:

Receiving a called request from the CS network for the user equipment;

Sending a paging request message to the AMF corresponding to the identifier of the AMF, requesting the AMF to page the user equipment;

Receiving a notification message sent by the AMF, informing the MSC that the user equipment needs to fall back to the CS network to make a voice call.
The method of claim 11 further comprising:

Receiving a paging response message sent by the user equipment, and ringing to the calling party that sends the called request.
An access and mobility management function AMF device, comprising:

a receiving module, configured to receive a joint registration request of the user equipment, where the joint registration request carries location information of the user equipment in a 5G network;

a registration module, configured to complete registration of the user equipment on the 5G network according to the joint registration request;

a joint update module, configured to send a joint location update request to the mobile switching center MSC of the circuit switched network after the registration of the 5G network is completed, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried;

The receiving module is further configured to receive a joint location update accept message sent by the MSC, where the joint location update accept message carries a temporary identifier that is allocated by the CS network to the user equipment;

And a sending module, configured to send a registration accept message to the user equipment, where the CS network carries a temporary identifier allocated by the CS network.
The AMF device according to claim 13, wherein the location information of the user equipment in the 5G network comprises an identifier of the user equipment in a cell of the 5G network.
The AMF device according to claim 13 or 14, wherein the joint location update accept message and the registration accept message further carry a location area identifier allocated by the CS network to the user equipment.
The AMF device according to claim 13, wherein the joint location update request further carries a 5G network location update type, and the 5G network location update type includes an initial registration or a location area update.
The AMF device of claim 13 wherein:

The receiving module is further configured to receive a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to initiate a voice call;

The sending module is further configured to send, to the user equipment, an indication message that falls back to the CS network, indicating that the user equipment falls back to the CS network to initiate a voice call.
The AMF device of claim 13 wherein:

The receiving module is further configured to receive a paging request message sent by the MCS of the CS network, where the paging request message carries an identifier of the user equipment;

The AMF device further includes a paging module, configured to send a paging message to the user equipment according to the identifier of the user equipment, and page the user equipment;

The receiving module is further configured to receive a NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to perform a voice call;

The sending module is further configured to send a notification message to the MSC, to notify the MSC that the user equipment needs to fall back to the CS network to make a voice call.
The method of claim 18, wherein

The sending module is further configured to send an initial context setup request message to the wireless access device of the 5G network, to notify the wireless access device to establish an initial context for the user equipment.
A mobile switching center, characterized in that it comprises:

a receiving module, configured to receive a joint location update request sent by the access and mobility management function AMF device, where the location information of the user equipment in the 5G network and the identifier of the AMF are carried;

An update module, configured to update a location of the user equipment to a home location register HLR in the CS network, and allocate a temporary identifier of the CS network to the user equipment;

a sending module, configured to send a joint location update accept message to the AMF corresponding to the identifier of the AMF, where the joint location update accept message carries a temporary identifier allocated by the CS network to the user equipment;

The receiving module is further configured to receive a temporary identity re-allocation complete message sent by the AMF, and the joint registration of the user equipment is completed.
The mobile switching center according to claim 20, wherein the location information of the user equipment in the 5G network comprises an identifier of the user equipment in a cell of the 5G network.
The mobile switching center according to claim 20 or 21, wherein the mobile switching center further comprises an allocation module, configured to allocate a location area identifier to the user equipment;

The joint location update accept message further carries a location area identifier allocated by the CS network to the user equipment.
A mobile switching center according to claim 20, characterized in that

The receiving module is further configured to receive a called request from the CS network for the user equipment;

The mobile switching center further includes a paging requesting module, configured to send a paging request message to the AMF corresponding to the identifier of the AMF, requesting the AMF to page the user equipment;

The receiving module is further configured to receive a notification message sent by the AMF, to notify the mobile switching center that the user equipment needs to fall back to the CS network to make a voice call.
A mobile switching center according to claim 23, wherein

The receiving module is further configured to receive a paging response message sent by the user equipment, where the mobile switching center further includes a ringing module, configured to ring the calling party corresponding to the called party.
An access and mobility management function AMF device includes: a processor and a memory; the memory is configured to store a computer execution instruction, and when the AMF device is running, the processor executes the computer execution of the memory storage An instruction to cause the AMF device to perform the communication method according to any one of claims 1-7.
A mobile switching center includes: a processor and a memory; the memory is configured to store computer execution instructions, and when the mobile switching center is running, the processor executes the computer-executed instructions stored in the memory to enable The mobile switching center performs the communication method according to any one of claims 8-12.
A computer readable storage medium having stored therein instructions that, when run on a computer, cause the computer to perform the communication method of any of claims 1-7.
A computer readable storage medium having stored therein instructions that, when run on a computer, cause the computer to perform the communication method of any of claims 8-12.