Service realization method, network unit and terminal

Abstract

This ensures service continuity when full coverage of the communication network is not achieved. [Solution] This disclosure provides a service implementation method, a network unit, and a terminal. The service implementation method applied to the terminal includes acquiring operation instruction information from a first network to a second network, and determining the operation of a related service based on the operation instruction information from the first network to the second network.

Description

[Technical Field]

[0001] This application claims priority from Chinese Patent Application No. 201810302350.1, filed with the China Patent Office on April 4, 2018, the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD The embodiments of the present disclosure relate to the field of communication technology, and in particular to a service realization method, a network unit, and a terminal. [Background technology]

[0003] In the early stages of carrier deployment of 5G (5th Generation) networks, hotspot coverage is used rather than full coverage. Some carriers also have full coverage 3G (3rd Generation) networks. 3G networks support voice services, for example, by connecting the IP Multimedia Subsystem (IMS) over a circuit-switched domain.

[0004] If the 5G network supports voice services, the terminal can directly start and end the voice service in the 5G network. If the terminal in the middle of the voice service leaves the 5G network and there are only 3G cells in the surrounding area, the voice service can only be interrupted because the operation between 5G and 3G is not supported.

[0005] If voice services are not supported in a 5G network, when a terminal connected to or residing in the 5G network requires voice services (e.g., when starting or ending a voice service), the voice services cannot be started in the 5G network.

[0006] The same problems will exist for other future communication networks.

[0007] Therefore, when full coverage of a communication network is not achieved, how to achieve service continuity and determine the access domain of a terminal is currently a technical problem to be solved. Summary of the Invention [Problem to be solved by the invention]

[0008] The embodiments of the present disclosure provide a service realization method, a network unit, and a terminal to solve the problem of how to realize service continuity and determine the access domain of a terminal when full coverage of a communication network is not realized. [Means for solving the problem]

[0009] In a first aspect, an embodiment of the present disclosure provides a service realization method. A service realization method applied to a first network unit located in a first network, comprising: Obtaining information related to an operation from the first network to the second network; Determine, based on the related information of the operation from the first network to the second network, indication information of the operation from the first network to the second network, and / or determine indication information of whether a related service is supported; Includes:

[0010] In a second aspect, an embodiment of the present disclosure provides a service realization method. A service realization method applied to a second network unit located in a first network, comprising: Obtaining information including at least one of information related to an operation from the first network to the second network and instruction information for an operation from the first network to the second network; Based on the acquired information, operate the terminal from the first network to the second network; Includes:

[0011] In a third aspect, an embodiment of the present disclosure provides a service realization method. A service realization method applied to a terminal, Obtaining operation instruction information from the first network to the second network; determining an operation of a related service according to operation instruction information from the first network to the second network; Includes.

[0012] In a fourth aspect, an embodiment of the present disclosure provides a first network unit. a first network unit located in a first network, an acquisition module for acquiring information related to an operation from the first network to the second network; a determining module for determining, based on the related information of the operation from the first network to the second network, indication information of the operation from the first network to the second network, and / or determining indication information of whether a related service is supported; Includes.

[0013] In a fifth aspect, an embodiment of the present disclosure provides a second network unit. a second network unit located in the first network, an acquiring module for acquiring information including at least one of information related to an operation from the first network to the second network and instruction information for the operation from the first network to the second network; an operation module for operating the terminal from the first network to the second network based on the acquired information; Includes.

[0014] In a sixth aspect, an embodiment of the present disclosure provides a terminal. A terminal, an acquisition module for acquiring operation instruction information from the first network to the second network; a decision module for deciding to operate a related service according to the operation instruction information from the first network to the second network; Includes:

[0015] In a seventh aspect, an embodiment of the present disclosure provides a first network unit. a first network unit including a processor, a memory, and a program stored in the memory and operable by the processor; When the program is executed by the processor, the service realization method applied to the first network unit is realized.

[0016] In an eighth aspect, an embodiment of the present disclosure provides a second network unit. a second network unit including a processor, a memory, and a program stored in the memory and operable by the processor, When the program is executed by the processor, the service realization method applied to the second network unit is realized.

[0017] In a ninth aspect, an embodiment of the present disclosure provides a terminal. A terminal including a processor, a memory, and a program stored in the memory and operable by the processor, When the program is executed by the processor, the service realization method applied to the terminal is realized.

[0018] In a tenth aspect, an embodiment of the present disclosure provides a storage medium. A computer-readable storage medium storing a program, When the program is executed by a processor, the above service realization method is realized. [Effects of the Invention]

[0019] In the embodiments of the present disclosure, it is clarified how to achieve service continuity and determine the access domain of the terminal when full coverage of the first network is not achieved. [Brief explanation of the drawings]

[0020] [Figure 1] 2 is a flowchart of a service realization method applied to a first network unit according to an embodiment of the present disclosure; [Figure 2] 1 is a flowchart of a service realization method applied to a second network unit according to an embodiment of the present disclosure. [Figure 3] 2 is a flowchart of a service realization method applied to a terminal according to an embodiment of the present disclosure; [Figure 4] 10 is a flowchart of a service realization method applied to a terminal according to another embodiment of the present disclosure; [Figure 5] 1 is a flowchart of a service realization method according to a first embodiment of the present disclosure. [Figure 6] 10 is a flowchart of a service realization method according to a second embodiment of the present disclosure. [Figure 7] 10 is a flowchart of a service realization method according to a third embodiment of the present disclosure. [Figure 8] 10 is a flowchart of a service realization method according to a fourth embodiment of the present disclosure. [Figure 9] FIG. 2 is a structural diagram of a first network unit according to an embodiment of the present disclosure; [Figure 10] FIG. 10 is a structural diagram of a second network unit according to an embodiment of the present disclosure. [Figure 11] FIG. 2 is a structural diagram of a terminal according to one embodiment of the present disclosure. [Figure 12] FIG. 10 is a structural diagram of a terminal according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0021] In the embodiments of the present disclosure, the network unit is any network side device or network function, for example, a radio access network unit or a core network unit.

[0022] In an embodiment of the present disclosure, the core network network unit includes, but is not limited to, at least one of a core network device, a core network node, a core network function, a core network network unit, an MME (Mobility Management Entity), an AMF (Access Management Function), an SMF (Session Management Function), a UPF (User Plane Function), an SGW (Serving GW), a PDN Gateway (PDN Gateway Way), a PCF (Policy Control Function), a PCRF (Policy and Charging Rules Function), an SGSN (Serving GPRS Support Node), and a GGSN (Gateway GPRS Support Node).

[0023] In an embodiment of the present disclosure, the radio access network unit includes, but is not limited to, at least one of a radio access network device, a radio access network node, a radio access network function, a radio access network unit, a 3GPP radio access network, a non-3GPP radio access network, a CU (Centralized Unit), a DU (Distributed Unit), a base station, an eNB (evolved Node B), a 5G base station (gNB), an RNC (Radio Network Controller), a base station (NodeB), an N3IWF (Non-3GPP Inter Working Function), an AC (Access Controller) node, an AP (Access Point) device, or a WLAN (Wireless Local Area Networks) node.

[0024] The base station may be a BTS (Base Transceiver Station) in a GSM (Global System of Mobile communication) system or a CDMA (Code Division Multiple Access), a base station (NodeB) in a WCDMA (Wideband Code Division Multiple Access), and even an eNB or eNodeB (Evolutionary Node B) in LTE and a 5G base station (gNB), but is not limited to these in the embodiments of the present disclosure.

[0025] In this disclosure, eLTE (evolved LTE) is a method in which EUTRA (Evolved Universal Terrestrial Radio Access) directly connects to 5GC (5G Core). EPS (Evolved Packet System) is also called LTE.

[0026] In this disclosure, emergency services may also be referred to as emergency voice services or emergency IMS voice services. The indication of whether emergency services are supported includes, but is not limited to, at least one of an emergency services support indicator and an emergency services fallback indicator.

[0027] In the present disclosure, the voice service is also referred to as an IMS voice service over a Packet Switch (PS) domain session mode. The indication of whether the voice service is supported includes, but is not limited to, at least one of an IMS voice service support indication, an IMS voice over PS session supported indication, an IMS voice service over a Circuit Switch (CS) domain support indication, and an IMS voice service accessing a PS domain session mode over 3GPP (IMS voice over PS session supported indication over 3GPP).

[0028] In this disclosure, voice services include emergency voice services.

[0029] In this disclosure, redirection refers to a method in a radio access network to release the connection between a UE and the network and indicate a redirect frequency point.

[0030] In this disclosure, CS switching from a first network to a second network may also be referred to as, but not limited to, any of the following: PS-CS Single Radio Voice Call Continuity (SRVCC) switching, first network SRVCC, first network-second network SRVCC, first network SRVCC switching, PS-CS domain switching, PS-CS switching from a first network to a second network, supporting voice service continuity from a first network to a second network, single radio supporting voice service continuity from a first network to a second network, fallback from a first network to a second network, etc. Standards organizations may name it by other names, but this disclosure is not affected by the name.

[0031] In this disclosure, switching operation from a first network to a second network may also be referred to as, but not limited to, interoperation between the first network and the second network, or fallback from the first network to the second network.

[0032] In this disclosure, CS switching from a 5G network to a 3G network may also be referred to as, but not limited to, PS-CS SRVCC switching, 5G SRVCC, 5G-3G SRVCC, 5G SRVCC switching, PS-CS domain switching, PS-CS switching from a 5G network to a 3G network, voice service continuity support from a 5G network to a 3G network, fallback from a 5G network to a 3G network, operation from a 5G network to a 3G network, or interoperation between a 5G network and a 3G network.

[0033] In this disclosure, initiating a service refers to initiating the service as a caller, and terminating a service refers to receiving the service as a callee.

[0034] The 5G network includes, but is not limited to, at least one of a 5G core network, a 5G radio access network, EUTRA connected to 5GC, NR (New Radio) connected to 5GC, NR, NGRAN (Next Generation Radio Access Network), 5GC, N3GPP (Non-3GPP), etc. The network unit of the 5G network includes, but is not limited to, at least one of AMF, SMF, UPF, PCF, UDM, gNB, eNB connected to AMF, etc.

[0035] The 3G network includes, but is not limited to, at least one of a 3G core network, a 3G radio access network, CDMA, 3GPP2 1x, a Universal Mobile Telecommunications System Terrestrial Radio Access Network (UTRAN), a High-Speed ​​Packet Access (HSPA), a General Packet Radio Service (GPRS), a Universal Terrestrial Radio Access (UTRA), a Radio Network Subsystem (RNS), a Base Station Subsystem (BSS), etc. The network units of the 3G network include, but are not limited to, at least one of a Mobile Switching Center (MSC), an MSC Server, a Media Gateway (MGW), an SGSN, a GGSN, an RNC, a NodeB, etc. The 3G network CS refers to the circuit-switched domain of the 3G network, and includes, but is not limited to, at least one of a 3G network network unit 3GPP2 1x, UTRAN, HSPA, an MSC, an MSC Server, an MGW, etc.

[0036] The 4G network includes at least one of a 4G core network, a 4G radio access network, EUTRA connected to an EPC, an EPC, EUTRA, LTE, EPS, etc. The network units of the 4G network include, but are not limited to, at least one of an MME, an SGW, a Packet Data Network Gateway (PGW), a Home Subscriber Server (HSS), an eNB, etc.

[0037] Hereinafter, the technical means of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of them. Based on the embodiments of the present disclosure, all other embodiments that can be made by those skilled in the art without any creative work shall fall within the protection scope of the present disclosure.

[0038] Please refer to Fig. 1. Fig. 1 is a flowchart of a service realization method applied to a first network unit located in a first network according to an embodiment of the present disclosure. In the method, Step 11: obtaining information related to the operation from the first network to the second network; and step 12 of determining, based on the related information of the operation from the first network to the second network, indication information for the operation from the first network to the second network, and / or determining indication information for whether a related service is supported.

[0039] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU (Protocol Data Unit) session establishment requests, QoS (Quality of Service) flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0040] In some alternative embodiments of the present disclosure, the first network unit is a core network unit, and of course, the possibility that the first network unit is a radio access network unit is not excluded.

[0041] In some alternative embodiments of the present disclosure, the first network unit comprises: Settings and A terminal and A core network network unit (e.g., AMF (Access Management Function), SMF (Session Management Function), UDM (Unified Data Management)) of the first network; a radio access network network unit of the first network; a network unit of a third network (e.g., a Mobility Management Entity (MME) supporting operations from the first network to the second network, in which case the network unit of the third network is a proxy for operations between the first network and the second network); a network unit of the second network (e.g., a Mobile Switching Center Server (MSC Server) supporting operations from the first network to the second network); and obtaining information related to the operation from the first network to the second network from at least one of the above.

[0042] In some alternative embodiments of the present disclosure, the related information of the operation from the first network to the second network includes: Whether an associated interface is configured in the first network to support operations from the first network to the second network; a related interface mode of operation from the first network to the second network set in the first network; Second network capability information of the terminal; Information on whether the terminal supports operation from a first network to a second network; Information on whether a network unit of the first network (e.g., AMF, SMF, or NG RAN, which may include the first network unit of the first network) supports operation from the first network to the second network; Whether the terminal allows operation from the first network to the second network (for example, whether the terminal contract information allows operation from the first network to the second network); Terminal IMS session transition number, Information on whether the IMS session transition number of the terminal exists; The terminal's mobile station international subscriber identifier (MS international PSTN (Public Switched Telephone Network) / ISDN (Integrated Service Digital Network) number (Mobile Subscriber International ISDN number, MSISDN), Information on whether the terminal's mobile station international subscriber identifier exists; Whether the terminal ID of the terminal in the first network can be mapped to the terminal ID in the second network; Whether the type of the SUPI (Subscription Permanent Identifier) ​​of the terminal is IMSI (International Mobile Subscriber Identification Number); whether the terminal is in single registration mode or dual registration mode; whether the terminal is single radio or dual radio; whether the terminal is voice-centric or data-centric; Carrier policies, whether the carrier is configured to support the related service by operation from the first network to the second network; whether the carrier is configured to support continuity of said related services by operation from the first network to the second network; Radio conditions, Whether the wireless conditions of the terminal satisfy the operation from the first network to the second network; Information about the related services mentioned above; whether there is an ongoing related service; whether a request for the related service has been received; Contains at least one of the following:

[0043] In some embodiments, the second network capability information of the terminal includes one of a mobile station network capability (MS (Mobile Station) network capability), a second network radio capability, supported circuit switched domain voice codec list information, mobile station class mark 2 information (MS Class Mark2), and mobile station class mark 3 information (MS Class Mark3).

[0044] In some embodiments, the IMS session transfer number of the terminal includes one of a Session Transfer Number-single Radio (STN-SR), an Emergency Session Transfer Number-single Radio (E-STN-SR), and an Emergency Session Transfer Number.

[0045] In some embodiments, the terminal's Mobile Station International Subscriber Identifier comprises a Correlation Mobile Subscriber International ISDN number (C-MSISDN).

[0046] In some embodiments, whether a request for the related service has been received includes one of whether a Quality of Service (QoS) flow establishment request for the related service has been received, whether a Protocol Data Unit (PDU) session establishment request for the related service has been received, whether a PDU session modification request for the related service has been received, or whether a service request for the related service has been received.

[0047] In some embodiments, the information on whether operation from the first network to the second network is supported includes capability-related information for operation from the first network to the second network, wherein the capability-related information for operation from the first network to the second network includes at least one of core network capabilities for operation from the first network to the second network and radio capabilities for operation from the first network to the second network.

[0048] Whether the terminal ID of the terminal in the first network can be mapped to the terminal ID in the second network, In some embodiments, the type of SUPI is IMSI or NAI (Network Access Identifier). 3G networks do not support NAI-type terminal IDs. It is easy to understand that when SUPI is the ID of the first network and 3G is the second network, the NAI type cannot be mapped to the second network ID.

[0049] In some alternative embodiments of the present disclosure, the first network is a 5G network and the second network is a 3G network.

[0050] In some implementations, the related service includes one of a voice service (also referred to as an IMS voice service), an emergency service (also referred to as an emergency voice service).

[0051] In some alternative embodiments of the present disclosure, the related interface manner of operation of the first network and the second network includes: the first network operating via a direct interface with the second network; the first network interoperates with the third network, and the third network interoperates with the second network to realize the operation of the first network and the second network; Contains at least one of the following:

[0052] In some alternative embodiments of the present disclosure, when a first network operates with a second network via a direct interface, the interface between the first network and the second network is an Sv interface. When a first network interoperates with a third network and further realizes the operation of the first network and the second network through the interoperation between the third network and the second network, the interface between the first network and the third network is an N26 interface, and the interface between the third network and the second network is an Sv interface.

[0053] In some alternative embodiments of the present disclosure, the first network is a 5G network and the second network is a 3G network, and the associated interface for operation from the first network to the second network includes at least one of the following: Whether the first network is configured to support an SV interface, such as an interface between an AMF and an MSC (Mobile Switching Center) or an interface between an AMF and an MSC server. The SV interface is an interface between a 4G network and a 3G network. Whether the first network is configured to support the N26 interface. For example, whether a 4G network unit (e.g., MME) connected to the first network unit via the N26 interface supports 5G SRVCC (Single Radio Voice Call Continuity) transmission. The N26 interface is an interface between the 5G network and the 4G network. In the first network, whether it is configured to support an interface from a 5G network to a 3G network, such as an interface between an AMF and an MSC, or an interface between an AMF and an MSC Server. Whether the network unit of the 3G network that supports the interface from the 5G network to the 3G network supports operation from the 5G network to the 3G network.

[0054] Each of the above interfaces will be described in detail below.

[0055] To enable terminals to achieve high-speed data connections on 5G networks while supporting continuity of voice services and avoiding or minimizing impact on 3G networks, the following architectures may exist: 1) The 5G network unit (e.g., AMF) supports the connection between the Sv interface and the 3G network unit (MSC), i.e., by reusing existing protocol definitions on the Sv interface, changes to the 3G network can be avoided. 2) Support interoperation between 3G networks and 5G networks with a proxy 4G network unit. The N26 interface is supported between the 5G network unit (e.g., AMF) and the 4G network unit (e.g., MME), and the 4G network unit supports connection with the 3G network unit via the Sv interface. The 4G network unit operates as a 3G network proxy. 3) Define a new interface between the 5G network unit and the 3G network unit.

[0056] In some alternative embodiments of the present disclosure, the operation from the first network to the second network includes at least one of switching from the first network to the second network, switching CS from the first network to the second network, and maintaining continuity of the associated service.

[0057] In some optional embodiments of the present disclosure, the instruction information for operation from the first network to the second network includes at least one of the following: Indication information on whether an operation from the first network to the second network is possible. Specifically, the parameter value in the instruction information is whether it is possible (e.g., enable, available, possible, etc.) or whether it will be performed. For example, an operation from the first network to the second network is possible (an operation from the first network to the second network is possible and an operation from the first network to the second network is enabled), or an operation from the first network to the second network is performed. Regarding "possible," a receiving side that acquires the instruction information can decide when to perform the operation from the first network to the second network. Regarding "execute," a receiving side that acquires the instruction information can decide to immediately perform the operation from the first network to the second network. An indication of whether a switchover from the first network to the circuit switched (CS) of the second network is possible. An indication of whether continuity of service can be maintained.

[0058] In some alternative embodiments of the present disclosure, the operation from the first network to the second network comprises: Switching from the first network to the second network, CS switching from the first network to the second network, Maintaining continuity of the aforementioned related services; Contains at least one of the following:

[0059] In some embodiments, the operation of maintaining continuity of the associated service is to switch to a second network capable of supporting the associated service when the terminal moves out of first network coverage or when the first network signal quality is no longer sufficient to satisfy access, for the continuity of the associated service.

[0060] In an embodiment of the present disclosure, optionally, when the related information of the operation from the first network to the second network includes at least one of the following, the instruction information of the operation from the first network to the second network includes instruction information of switching from the first network to the second network (switching from the first network to the second network is possible, or switching from the first network to the second network is performed), instruction information of CS switching from the first network to the second network (CS switching from the first network to the second network is possible, or switching from the first network to the second network is performed), and / or instruction information of maintaining continuity of the related services (continuity of the related services can be maintained, or maintaining continuity of the related services is performed). The terminal supports operation from the first network to the second network. In the first network, operation from the first network to the second network is supported. In the first network, a related interface for operation from the first network to the second network (e.g., SV, N26, or new interfaces between 5G networks and 3G networks) is supported. A request for the related service (e.g., a QoS establishment request, a PDU session establishment request, a PDU session modification, or a service request) is received. There is an ongoing related service (QFI=1 indicates whether it is a voice service, and the emergency service instruction ID indicates whether it is an emergency service). A terminal ID of the terminal in the first network can be mapped to a terminal ID in the second network. The SUPI type of the device is IMSI. The terminal allows operation from the first network to the second network. The existence or acquisition of the IMS session transition number of the terminal. The presence or acquisition of the terminal's Mobile Station International Subscriber Identifier information. The carrier configures the related service to be supported by operation from the first network to the second network. The carrier configures the operation from the first network to the second network to support the continuity of the related services. The radio conditions of the terminal satisfy the switching from the first network to the second network (for example, there is a 3G cell or a 3G frequency point that satisfies the switching requirements). The device is in single enrollment mode. The device is a single radio. The device is voice centric.

[0061] In some alternative embodiments of the present disclosure, the first network unit sends operation instruction information from the first network to the second network to the terminal, the second network unit and / or the network unit of the radio access network.

[0062] In some alternative embodiments of the present disclosure, the step of determining, based on the related information of the operation from the first network to the second network, an indication of whether the related service is supported, comprises: determining whether the conditions of whether operation from the first network to the second network is possible, whether CS switching from the first network to the second network is possible, and / or whether the continuity of the related services is guaranteed are met based on the information related to the operation from the first network to the second network; and determining, based on the determination result, an indication of whether the related service is supported.

[0063] In an embodiment of the present disclosure, Operation from the first network to the second network is possible; It is possible to switch from the first network to the second network; It is possible to switch CS from the first network to the second network. The continuity of the related services can be maintained; If at least one of the above conditions is satisfied, the indication information indicating whether the related service is supported indicates that the related service is supported.

[0064] not supporting operations from the first network to the second network; Not supporting switching from the first network to the second network; Not supporting CS switching from the first network to the second network; the inability to maintain continuity of the aforementioned related services; If at least one of the above conditions is satisfied, the indication information on whether the related service is supported indicates that the related service is not supported.

[0065] In some alternative embodiments of the present disclosure, the indication information for determining whether the associated service is supported includes: Indication of whether IMS voice services are supported; an indication of whether IMS voice services over packet-switched domain are supported; Indication information on whether IMS voice service accessing a PS domain session method according to 3GPP (IMS voice over PS Session Supported Indication over 3GPP) is supported; Indication of whether IMS voice service is supported by CS; Indication of whether emergency services are supported; An indication of whether emergency services fallback is supported; Contains at least one of the following:

[0066] In some alternative embodiments of the present disclosure, the first network unit sends an indication of whether the associated service is supported to the terminal, the second network unit, and / or a network unit of a radio access network.

[0067] In the above embodiment of the present disclosure, optionally, the first network is a 5G network and the second network is a 3G network. Of course, the first network and the second network may be other types of networks. Optionally, the data transmission rate of the first network is greater than the data transmission rate of the second network.

[0068] Please refer to Fig. 2. Fig. 2 is a flowchart of a service realization method applied to a second network unit located in a first network according to an embodiment of the present disclosure. The realization method is as follows: Step 21 of obtaining information including at least one of information related to an operation from the first network to the second network and information indicating an operation from the first network to the second network; and step 22 of operating the terminal from the first network to the second network based on the acquired information.

[0069] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0070] In some alternative embodiments of the present disclosure, the second network unit is a radio access network unit or a core network unit.

[0071] In some embodiments of the present disclosure, the second network unit receives the information from the first network unit and / or the terminal.

[0072] In some optional embodiments of the present disclosure, the relevant information for the operation from the first network to the second network is as described in the method embodiment of the first network unit shown in Figure 1 above, and detailed description will be omitted here.

[0073] In some optional embodiments of the present disclosure, the operation instruction information from the first network to the second network is as described in the method embodiment section of the first network unit shown in Figure 1 above, and detailed description will be omitted here.

[0074] In some alternative embodiments of the present disclosure, the operation from the first network to the second network comprises: The associated operations of switching from the first network to the second network; Related operations for switching CS from the first network to the second network; Maintaining continuity of the aforementioned related services; Contains at least one of the following:

[0075] In some alternative embodiments of the present disclosure, the associated operation of switching from the first network to the second network includes: Initiating a switchover process from the first network to the second network; Initiating a CS switching process from the first network to the second network; Sending a CS switching instruction from the first network to the second network; redirecting the device to a second network; Contains at least one of the following:

[0076] Wherein, the switching process from the first network to the second network includes at least one of the following: One of the cells of the second network is selected. The initiated switch request indicates a CS switch from the first network to the second network. The switching request includes transparent container information from the source radio access network to the target radio access network, such as source RNC to Target RNC Transparent Container. Include MS Class Mark 2 in your conversion request. Include MS Class Mark 3 in your conversion request. The terminal is configured in the first network to make measurements of the second network. A measurement report of the second network is obtained from the terminal.

[0077] Wherein, the process of redirecting the terminal to the second network includes at least one of the following: Among the redirect frequency points, a frequency point that indicates the second network is transmitted to the terminal. The initiated switch request indicates a CS switch from the first network to the second network. Release the terminal connection. In the broadcasted cell reselection information, the frequency point related information of the second network is indicated.

[0078] The cell reselection information transmitted to the terminal includes frequency point related information of the second network.

[0079] In some alternative embodiments of the present disclosure, the step of operating the terminal from the first network to the second network based on the acquired information includes: performing the operation from the first network to the second network if the information indicates that the operation from the first network to the second network is possible or that continuity of the associated service can be maintained; If the information indicates that the operation from the first network to the second network is impossible or the continuity of the related service cannot be maintained, not performing the operation from the first network to the second network or releasing the wireless connection of the terminal; performing an operation from the first network to the second network if the information indicates that the associated service exists, a switching event to switch from the first network has occurred, and the operation from the first network to the second network is possible or continuity of the associated service can be maintained; If the information indicates that the related service exists, a switching event for switching from the first network occurs, and the operation from the first network to the second network is impossible or the continuity of the related service cannot be maintained, not performing the operation from the first network to the second network or releasing the wireless connection of the terminal; If the information indicates receipt of a CS switch instruction from the first network to the second network, initiating a CS switch operation from the first network to the second network; If the information indicates receiving a CS switching instruction from the first network to the second network and receiving a QoS flow establishment request for the related service, initiating a CS switching operation from the first network to the second network; If the information indicates that there is no switching event for switching from the first network of the related service, and that a CS switching instruction is received from the first network to the second network, and that a QoS flow establishment request is received for the related service, initiate a CS switching operation from the first network to the second network; Contains at least one of the following:

[0080] In some alternative embodiments of the present disclosure, the first network is a 5G network and the second network is a 3G network.

[0081] In some alternative embodiments of the present disclosure, the associated service includes one of a voice service and an emergency service.

[0082] Please refer to Figure 3. Figure 3 is a flowchart of a service realization method applied to a terminal according to one embodiment of the present disclosure, which includes step 31 of sending operation-related information from the first network to the second network when accessing the first network.

[0083] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0084] In some embodiments, the terminal transmits information related to the operation from the first network to the second network to the first network unit and / or the second network unit.

[0085] In some optional embodiments of the present disclosure, the relevant information for the operation from the first network to the second network is as described in the method embodiment section of the first network unit shown in Figure 1 above, and detailed description will be omitted here.

[0086] In some optional embodiments of the present disclosure, after the step of transmitting the operation-related information from the first network to the second network, the method further includes a step of obtaining instruction information for the operation from the first network to the second network. The instruction information for the operation from the first network to the second network is as described in the method embodiment of the first network unit shown in Figure 1 above, and detailed description will be omitted here. In some embodiments, the terminal receives the instruction information for the operation from the first network to the second network from the first network unit and / or the second network unit.

[0087] Please refer to Figure 4. Figure 4 is a flowchart of a service realization method applied to a terminal according to another embodiment of the present disclosure, Step 41 of obtaining operation instruction information from the first network to the second network; and determining 42 an operation of a related service based on the operation instruction information from the first network to the second network.

[0088] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0089] In some embodiments of the present disclosure, the terminal receives instruction information for operation from the first network unit to the second network unit from the first network unit and / or the second network unit.

[0090] In some optional embodiments of the present disclosure, before the step of obtaining the instruction information for the operation from the first network to the second network, the method further includes a step of transmitting information related to the operation from the first network to the second network when accessing the first network. In some embodiments, the terminal transmits the information related to the operation from the first network to the second network to the first network unit and / or the second network unit.

[0091] In some optional embodiments of the present disclosure, the operation instruction information from the first network to the second network is as described in the method embodiment section of the first network unit shown in Figure 1 above, and detailed description will be omitted here.

[0092] In some alternative embodiments of the present disclosure, the operation of the related service includes: Selecting an access domain; determining whether to reside on a first network; determining whether to start or end the associated service in the first network; determining whether to initiate a request for the associated service in the first network; Contains at least one of the following:

[0093] In some embodiments, determining whether to initiate a request for the related service in the first network includes one of determining whether to initiate a QoS flow establishment request for the related service in the first network, determining whether to initiate the related service PDU session establishment request in the first network, determining whether to initiate a PDU session modification request for the related service in the first network, and determining whether to initiate a service request for the related service in the first network.

[0094] A determination is made as to whether to initiate a service request for the associated service in the first network.

[0095] The terminal can determine whether the related service can be started and ended in the first network, and whether continuity of the related service can be maintained as the terminal moves after the related service is started in the first network, and can determine whether to start the related service in the first network. The related services include a voice service and an emergency service. The emergency service can be established by initiating a PDU session for the emergency service or by initiating a service request indicating the emergency service.

[0096] In some alternative embodiments of the present disclosure, if the indication information indicates that operation from the first network to the second network is possible or that continuity of the associated service can be maintained, the step of determining the operation of the associated service includes: Starting or terminating the associated service in the first network; Initiating establishment of a PDU session for the associated service in a first network; initiating a service request in the first network indicating the associated service; selecting to reside on a first network; Contains at least one of the following: When the indication information indicates that operation from the first network to the second network is impossible or service continuity cannot be maintained, the step of determining operation of the service includes: not starting or terminating the related service in the first network; not initiating establishment of a PDU session for the associated service in the first network; not initiating a service request in the first network indicating the associated service; Not reside on the first network; Contains at least one of the following:

[0097] In some alternative embodiments of the present disclosure, the first network is a 5G network, the second network is a 3G network, and the associated service includes one of a voice service and an emergency service.

[0098] A 5G network may not support interoperation between a 5G network and a 3G network (e.g., switching from a 5G network to a 3G network CS domain). A terminal may not support interoperation between a 5G network and a 3G network (e.g., switching from a 5G network to a 3G network CS domain). Even if it can be supported, switching from a 5G network to a 3G network CS domain is not necessarily permitted. If a 5G network supports interoperation with a 3G network, it is unclear whether it can initiate switching from a 5G network to a 3G network (e.g., switching from a 5G network to a 3G network CS domain) for a particular terminal.

[0099] If operation from a 5G network to a 3G network is not required, the UE is not configured for 3G measurements in the 5G radio access network even if the terminal supports operation from a 5G network to a 3G network.

[0100] If operation from a 5G network to a 3G network is required, the 5G radio access network should configure the UE to perform 3G measurements to subsequently initiate a switch from the 5G network to the 3G network.

[0101] The above method of the present disclosure can accurately determine the related operation from 5G to 3G in order to ensure the continuity of the voice service or the start and end of the voice service in the radio access network. The terminal can determine whether the voice service can be started and ended in the 5G network, and whether the continuity of the voice service can be maintained as the terminal moves after starting the voice service in the 5G network, and can determine whether to start the voice service in the 5G network.

[0102] The above method of the present disclosure will be described in detail below with reference to specific examples. Example 1

[0103] Please refer to Fig. 5. Fig. 5 is a flowchart of a service realization method according to the first embodiment of the present disclosure. The service realization method according to the first embodiment of the present disclosure includes the following steps.

[0104] In step 51, a Radio Resource Control (RRC) message including a registration request message is sent from the terminal to the 5G radio access network.

[0105] In step 52, an N2 interface message including a registration request message is sent from the 5G radio access network to the 5G core network (e.g., AMF).

[0106] Optionally, the RRC message includes information related to the operation from the first network to the second network (described in step 12, and detailed description is omitted here), for example, at least one of information related to the radio capabilities of the terminal for operation from the 5G network to the 3G network and information related to the 3G network capabilities of the terminal.

[0107] Optionally, the N2 interface message (e.g., an initial UE message) includes information related to the operation from the first network to the second network (described in step 12, and detailed description is omitted here), for example, including at least one of radio capability related information for the terminal's operation from the 5G network to the 3G network, information related to the terminal's 3G network capability, and radio capability related information for the 5G radio access network's operation from the 5G network to the 3G network.

[0108] Optionally, the registration request message includes information related to operation from the first network to the second network (described in step 12, and detailed description is omitted here), for example, at least one of information related to the terminal's capability of operation from the 5G network to the 3G network and information related to the terminal's 3G network capability.

[0109] In one embodiment, the 3G network capability related information of the terminal is MS network capability information.

[0110] In one embodiment, the capability-related information of the terminal's operation from a 5G network to a 3G network includes at least one of capability-related information of switching from a 5G network to a 3G network, capability-related information of redirection from a 5G network to a 3G network, capability-related information of switching from a 3G network to a 5G network, and capability-related information of redirection from a 3G network to a 5G network.

[0111] In one embodiment, the capability-related information for switching from a 5G network to a 3G network includes at least one of capability-related information for switching from a 5G network to a CS area of ​​a 3G network, capability-related information for switching from a 5G network to a packet-switched (PS) area of ​​a 3G network, and capability-related information for switching from a 5G network to a CS area of ​​a 3G network while maintaining voice continuity.

[0112] It can be easily understood that the capability-related information of an operation includes at least indication information on whether the operation is supported. For example, the capability-related information of switching from a 5G network to a CS area of ​​a 3G network while maintaining voice continuity includes at least indication information on whether maintaining voice continuity is supported for switching from the 5G network to a CS area of ​​a 3G network. The capability-related information of switching from a 5G network to a CS area of ​​a 3G network includes at least indication information on whether CS switching from a 5G network to a 3G network is supported.

[0113] It is easy to understand that a terminal capable of interoperating between a 5G network and a 3G network supports interoperation between a 5G network and a 3G network, and a terminal not capable of interoperating between a 5G network and a 3G network does not support interoperation between a 5G network and a 3G network.

[0114] In step 53, the 5G core network registers with the UDM and obtains at least one of the following from the UDM: contract information of the terminal (whether to allow the terminal to operate from the 5G network to the 3G network), the SUPI type of the terminal, the IMS session transition number (the initial IMS session transition number may be a dummy IMS session transition number, and whether to allow the terminal to operate from the 5G network to the 3G network can be determined based on whether the IMS session transition number can be obtained), and the MSISDN. Optionally, the contract information includes whether to allow the terminal to interoperate between the 5G network and the 3G network.

[0115] In one embodiment, the 5G and 3G interoperation of the terminal includes at least one of switching from a 5G network to a 3G network, redirecting from a 5G network to a 3G network, switching from 3G to 5G, and redirecting from 3G to 5G.

[0116] In one embodiment, the switch from the 5G network to the 3G network includes at least one of a CS switch from the 5G network to the 3G network, a switch from the 5G network to the 3G network PS, and a CS switch from the 5G network to the 3G network while preserving voice continuity.

[0117] In one embodiment, whether to allow the terminal to interoperate between the 5G network and the 3G network is determined based on whether STN-SR can be obtained, and if so, indicates permission; otherwise, indicates not permission.

[0118] In one embodiment, if the SUPI type is IMSI, interoperation between the 5G network and the 3G network is supported. If the SUPI type is a type other than IMSI (e.g., NAI), interoperation between the 5G network and the 3G network is not supported. It can be easily understood that the SUPI type of a terminal that has interoperability between the 5G network and the 3G network or supports interoperation between the 5G network and the 3G network is IMSI.

[0119] In addition, the 5G core network can obtain at least one of related information about whether an interoperation interface is supported and whether other network units support interoperation between the 5G network and the 3G network. In one embodiment, the 5G core network obtains the information from a configuration.

[0120] In step 54, the 5G core network determines instruction information for operation from the 5G network to the 3G network based on the acquired information related to the operation from the 5G network to the 3G network. The 5G core network sends an N2 interface message (such as an initial UE context establishment request message or a downlink NAS transmission message) to the 5G radio access network. Optionally, the message includes instruction information for operation from the 5G network to the 3G network. The message includes a registration accept message sent to the terminal. Optionally, the registration accept message includes instruction information for operation from the 5G network to the 3G network.

[0121] In one embodiment, the 5G radio access network performs a related operation from the 5G network to the 3G network for the terminal based on the obtained instruction information regarding the operation from the 5G network to the 3G network.

[0122] In step 55, the 5G radio access network sends an RRC message to the terminal. Optionally, the registration accept message includes instruction information for operation from the 5G network to the 3G network.

[0123] In one embodiment, the terminal obtains instruction information for operation from the 5G network to the 3G network (which can maintain voice continuity) from the message, and determines a service processing operation based on the obtained instruction information for operation from the 5G network to the 3G network.

[0124] After receiving the instruction information from the first network to the second network, the terminal determines the operation of the related service, as described in step 32, and the description thereof is omitted here. Example 2

[0125] In embodiment 2, the terminal initiates a PDU session of a related service in the 5G network, and initiates a switchover in the 5G network to switch the terminal to 3G to support the progress of the voice service.

[0126] Please refer to Fig. 6. Fig. 6 is a flowchart of a service realization method according to a second embodiment of the present disclosure. The service realization method according to the second embodiment of the present disclosure includes the following steps.

[0127] In step 61, an IMS session is established, either Mobile Originated (MO) or Mobile Terminated (MT).

[0128] In step 62, the 5G radio access network (5G radio access network) receives a QoS flow establishment request for a voice service.

[0129] In step 63, the 5G radio access network rejects the QoS flow establishment request and indicates a CS switch from the 5G network to the 3G network as the reason for the rejection.

[0130] Optionally, the 5G radio access network performs a related operation from the 5G network to the 3G network for the terminal based on the obtained instruction information regarding the operation from the 5G network to the 3G network.

[0131] In some alternative embodiments of the present disclosure, the operation instruction information from the first network to the second network is the same as that described in step 12, and a detailed description thereof will be omitted here.

[0132] In one embodiment, the 5G radio access network obtains radio capability related information for operation from the 5G network to the 3G network from the terminal.

[0133] In one embodiment, the 5G radio access network obtains instruction information regarding operation from the 5G network to the 3G network at least one of when receiving a voice service QoS flow establishment request and before receiving a voice service QoS flow establishment request.

[0134] The instruction information for the operation from the 5G network to the 3G network may be two instructions or one instruction. For example, ■ Upon receiving an indication that operation from the 5G network to the 3G network is possible, the radio access network configures the terminal to measure the 3G network and obtain a 3G network measurement report based on the information. Then, in response to receiving a QoS flow establishment request for voice and / or receiving a CS switching instruction from the 5G network to the 3G network, the radio access network initiates CS switching from the 5G network to the 3G network. ■The 3G network frequency point is set in advance in the 5G network radio access network. The radio access network initiates CS switching from the 5G network to the 3G network in response to receiving an instruction that operation from the 5G network to the 3G network is possible, receiving a QoS flow establishment request for voice, and / or receiving a CS switching instruction from the 5G network to the 3G network.

[0135] In step 64, the 5G radio access network sends a switch request message to the 5G core network, where the message includes at least one of a CS switch instruction from the 5G network to the 3G network, a source RNC to target RNC transparent container, a CSG ID, a CSG Mode, and an MS Class Mark2.

[0136] The 5G core network sends a PS-to-CS switch request to a network unit of the 3G network. In one embodiment, the 5G core network sends a PS-to-CS switch request to a network unit of the 3G network via a proxy network unit.

[0137] The subsequent switching process is omitted. Example 3

[0138] In embodiment 3, when a terminal performs a related service in a 5G network and the subsequent 5G network coverage does not meet the requirements, the 5G network initiates a switchover to switch the terminal to a 3G network, so as to maintain the continuity of the related service.

[0139] Please refer to Fig. 7. Fig. 7 is a flowchart of a service realization method according to a third embodiment of the present disclosure. The service realization method according to the third embodiment of the present disclosure includes the following steps.

[0140] In step 71, the terminal starts or ends a voice service in the 5G network.

[0141] In step 72, when the radio access network receives the measurement report, an event occurs to switch to the 5G network.

[0142] Optionally, the 5G radio access network performs a related operation from the 5G network to the 3G network for the terminal based on the obtained instruction information regarding the operation from the 5G network to the 3G network.

[0143] The 5G radio access network has already obtained instruction information regarding operation from the 5G network to the 3G network before the handover occurs.

[0144] The 5G radio access network sends a switch request message to the 5G core network (e.g., AMF), where the message includes at least one of a CS switch instruction from the 5G network to the 3G network, a source RNC to a target RNC transparent container, a CSG ID, a CSG Mode, and an MS Classmark2.

[0145] The 5G core network sends a PS to CS switching request to the 3G network unit.

[0146] In one embodiment, the 5G core network sends a PS to CS switch request to a network unit of the 3G network via a proxy network unit.

[0147] In step 73, the switching process is then skipped. Example 4

[0148] In Example 4, the terminal initiates the establishment of a related service in the 5G network, and initiates a switchover in the 5G network to switch the terminal to 3G to support the progress of the related service.

[0149] Please refer to Fig. 8. Fig. 8 is a flowchart of a service realization method according to a fourth embodiment of the present disclosure. The service realization method according to the fourth embodiment of the present disclosure includes the following steps.

[0150] In step 81, the terminal resides in a 5G network.

[0151] In step 82, if the terminal needs to proceed with the related service, it sends a service request to the 5G core network (e.g., AMF) and indicates the related service in the service request.

[0152] Optionally, the 5G core network determines instruction information for operation from the 5G network to the 3G network based on the acquired related information for operation from the 5G network to the 3G network.

[0153] In some alternative embodiments of the present disclosure, the relevant information for the operation from the first network to the second network is the same as that described in step 12, and will not be described in detail here.

[0154] In some alternative embodiments of the present disclosure, the operation instruction information from the first network to the second network is the same as that described in step 12, and a detailed description thereof will be omitted here.

[0155] In step 83, the 5G core network sends an N2 interface message to the 5G radio access network. Optionally, the message includes instruction information for operation from the first network to the second network.

[0156] Optionally, the 5G radio access network performs a related operation from the 5G network to the 3G network for the terminal based on the obtained instruction information regarding the operation from the 5G network to the 3G network.

[0157] In one embodiment, the 5G radio access network obtains radio capability related information from the terminal for operation of the 5G network to the 3G network.

[0158] In one embodiment, the 5G radio access network obtains instruction information regarding operation from the 5G network to the 3G network at least one of when receiving a voice service QoS flow establishment request and before receiving a voice service QoS flow establishment request.

[0159] The instruction information for the operation from the 5G network to the 3G network may be two instructions or one instruction. For example, ■ Upon receiving an indication that operation from the 5G network to the 3G network is possible, the radio access network configures the terminal to measure the 3G network and obtain a 3G network measurement report based on the information. Then, in response to receiving a QoS flow establishment request for voice and / or receiving a CS switching instruction from the 5G network to the 3G network, the radio access network initiates CS switching from the 5G network to the 3G network. ■The 3G network frequency point is set in advance in the 5G network radio access network. The radio access network initiates CS switching from the 5G network to the 3G network in response to receiving an instruction that operation from the 5G network to the 3G network is possible, receiving a QoS flow establishment request for voice, and / or receiving a CS switching instruction from the 5G network to the 3G network.

[0160] In step 84, the 5G radio access network sends a switch request message to the 5G core network, where the message includes at least one of a CS switch instruction from the 5G network to the 3G network, a source RNC to target RNC transparent container, a CSG ID, a CSG Mode, and an MS Class Mark2.

[0161] The 5G core network sends a PS-to-CS switch request to a network unit of the 3G network. In one embodiment, the 5G core network sends a PS-to-CS switch request to a network unit of the 3G network via a proxy network unit.

[0162] In step 84, the switching process is then skipped.

[0163] Please refer to Figure 9. Figure 9 is a structural diagram of a first network unit according to an embodiment of the present disclosure. The first network unit 90 according to the embodiment of the present disclosure located in the first network comprises: an acquisition module 91 for acquiring information related to operations from the first network to the second network; and a determination module 92 that determines, based on the related information of the operation from the first network to the second network, indication information for the operation from the first network to the second network, and / or determines indication information for whether a related service is supported.

[0164] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0165] In some optional embodiments of the present disclosure, the acquisition module 91 acquires information related to operations from the first network to the second network from at least one of a terminal, an access management function, a session management function, a radio access network of the first network, a unified data management function, a network unit of a third network, and a network unit of the second network.

[0166] In the embodiment of the present disclosure, the relevant information of the operation from the first network to the second network is the same as that described in the method embodiment of the first network unit above, and the description thereof is omitted here.

[0167] In some alternative embodiments of the present disclosure, the first network is a 5G network, the second network is a 3G network, and the associated service includes one of a voice service and an emergency service.

[0168] In the embodiment of the present disclosure, the relevant interface manner for operation of the first network and the second network is the same as that described in the method embodiment of the first network unit above, and the description thereof is omitted here.

[0169] In some optional embodiments of the present disclosure, the operation instruction information from the first network to the second network is as described in the method embodiment section of the first network unit above, and the description thereof will be omitted here.

[0170] In some optional embodiments of the present disclosure, the first network unit further includes a transmitting module for transmitting operation instruction information from the first network to the second network to the terminal and / or a network unit of a radio access network.

[0171] In some optional embodiments of the present disclosure, the determination module 92 determines whether the conditions of whether operation from the first network to the second network is possible, whether CS switching from the first network to the second network is possible, and / or whether the continuity of the related service is guaranteed are met based on the related information of the operation from the first network to the second network, and determines the indication information of whether the related service is supported based on the determination result.

[0172] In some alternative embodiments of the present disclosure, the determination module 92: Operation from the first network to the second network is possible; It is possible to switch from the first network to the second network; It is possible to switch CS from the first network to the second network. The continuity of the related services can be maintained; If at least one of the following conditions is satisfied, the related service is supported by the indication information indicating whether the related service is supported; not supporting operations from the first network to the second network; Not supporting CS switching from the first network to the second network; the inability to maintain continuity of the aforementioned related services; If at least one of the above conditions is satisfied, the indication information indicating whether the service is supported in the first network unit indicates that the service is not supported in the first network unit.

[0173] In some optional embodiments of the present disclosure, the indication information for determining whether the related service is supported is as described in the method embodiment of the first network unit above, and the description thereof will be omitted here.

[0174] Please refer to Figure 10. Figure 10 is a structural diagram of a second network unit according to an embodiment of the present disclosure. The second network unit 100 according to the embodiment of the present disclosure located in the first network comprises: an acquiring module 101 for acquiring information including at least one of: information related to an operation from a first network to a second network; and instruction information for an operation from the first network to a second network; and an operation module 102 for operating the terminal from the first network to the second network based on the acquired information.

[0175] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0176] In the embodiment of the present disclosure, the relevant information of the operation from the first network to the second network is the same as that described in the method embodiment of the first network unit above, and the description thereof is omitted here.

[0177] In some alternative embodiments of the present disclosure, the operation from the first network to the second network comprises: Operations related to switching from the first network to the second network, Operations related to CS switching from the first network to the second network, the continuity of said related services; The method includes at least one of the following:

[0178] In some optional embodiments of the present disclosure, the operation related to switching from the first network to the second network includes: Initiating a switchover process from the first network to the second network; Initiating a CS switching process from the first network to the second network; Sending a CS switching instruction from the first network to the second network; redirecting the device to a second network; Contains at least one of the following:

[0179] In some alternative embodiments of the present disclosure, the operation module 102 includes: performing the operation from the first network to the second network if the information indicates that the operation from the first network to the second network is possible or that continuity of the associated service can be maintained; If the information indicates that the operation from the first network to the second network is impossible or the continuity of the related service cannot be maintained, not performing the operation from the first network to the second network or releasing the wireless connection of the terminal; performing an operation from the first network to the second network if the information indicates that the associated service exists, a switching event to switch from the first network has occurred, and the operation from the first network to the second network is possible or continuity of the associated service can be maintained; If the information indicates that the related service exists, a switching event for switching from the first network occurs, and the operation from the first network to the second network is impossible or the continuity of the related service cannot be maintained, not performing the operation from the first network to the second network or releasing the wireless connection of the terminal; If the information indicates receipt of a CS switch instruction from the first network to the second network, initiating a CS switch operation from the first network to the second network; If the information indicates receiving a CS switching instruction from the first network to the second network and receiving a QoS flow establishment request for the related service, initiating a CS switching operation from the first network to the second network; If the information indicates that there is no switching event for switching from the first network of the related service, and that a CS switching instruction is received from the first network to the second network, and that a QoS flow establishment request is received for the related service, initiate a CS switching operation from the first network to the second network; Do at least one of the following:

[0180] In some alternative embodiments of the present disclosure, the first network is a 5G network, the second network is a 3G network, and the associated service includes one of a voice service and an emergency service.

[0181] Please refer to Figure 11. Figure 11 is a structural diagram of a terminal in one embodiment of the present disclosure. The terminal 110 according to the embodiment of the present disclosure includes: an acquisition module 111 for acquiring operation instruction information from the first network to the second network; and a determination module 112 for determining the operation of a related service based on the operation instruction information from the first network to the second network.

[0182] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU (Protocol Data Unit) session establishment requests, QoS (Quality of Service) flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0183] In some alternative embodiments of the present disclosure, the terminal further includes a sending module for sending operation-related information from the first network to the second network when accessing the first network.

[0184] In some alternative embodiments of the present disclosure, the operation of the related service includes: Selecting an access domain; determining whether to reside on a first network; determining whether to initiate or terminate the request for the associated service in the first network; Contains at least one of the following:

[0185] In some alternative embodiments of the present disclosure, if the indication information indicates that operation from the first network to the second network is possible or that continuity of the related service can be maintained, the determination module: Starting or terminating the associated service in the first network; Initiating establishment of a PDU session for the associated service in a first network; initiating a service request in the first network indicating the associated service; selecting to reside on a first network; Do at least one of the following: In some alternative embodiments of the present disclosure, if the indication information indicates that operation from the first network to the second network is impossible or service continuity cannot be maintained, the determination module: not starting or terminating the related service in the first network; not initiating establishment of a PDU session for the associated service in the first network; not initiating a service request in the first network indicating the associated service; Not reside on the first network; Do at least one of the following:

[0186] In some alternative embodiments of the present disclosure, the first network is a 5G network, the second network is a 3G network, and the associated service includes one of a voice service and an emergency service.

[0187] In the above embodiments of the present disclosure, the network unit is any network side device or network function, for example, the network unit is a radio access network unit or a core network unit.

[0188] In an embodiment of the present disclosure, the core network network unit includes, but is not limited to, at least one of a core network device, a core network node, a core network function, a core network network unit, an MME (Mobility Management Entity), an AMF (Access Management Function), an SMF (Session Management Function), a UPF (User Plane Function), an SGW (Serving GW), a PDN Gateway (PDN Gateway Way), a PCF (Policy Control Function), a PCRF (Policy and Charging Rules Function), an SGSN (Serving GPRS Support Node), and a GGSN (Gateway GPRS Support Node).

[0189] In an embodiment of the present disclosure, the radio access network unit includes, but is not limited to, at least one of a radio access network device, a radio access network node, a radio access network function, a radio access network unit, a 3GPP radio access network, a non-3GPP radio access network, a CU (Centralized Unit), a DU (Distributed Unit), a base station, an eNB (evolved Node B), a 5G base station (gNB), an RNC (Radio Network Controller), a base station (NodeB), an N3IWF (Non-3GPP Inter Working Function), an AC (Access Controller) node, an AP (Access Point) device, or a WLAN (Wireless Local Area Networks) node.

[0190] The base station may be a BTS (Base Transceiver Station) in a GSM (Global System of Mobile communication) system or a CDMA (Code Division Multiple Access), a base station (NodeB) in a WCDMA (Wideband Code Division Multiple Access), and even an eNB or eNodeB (Evolutionary Node B) in LTE and a 5G base station (gNB), but is not limited to these in the embodiments of the present disclosure.

[0191] In this disclosure, eLTE is a method by which EUTRA directly connects to 5GC. EPS is also called LTE.

[0192] Please refer to FIG. 12. FIG. 12 is a structural diagram of a terminal according to another embodiment of the present disclosure. The terminal 120 includes components such as, but not limited to, a radio frequency unit 121, a network module 122, an audio output unit 123, an input unit 124, a sensor 125, a display unit 126, a user input unit 127, an interface unit 128, a memory 129, a processor 1210, and a power supply 1212. The structure of the terminal shown in FIG. 12 is not intended to limit the terminal, and those skilled in the art will understand that the terminal may include more or fewer components than those shown, or may combine certain components, or may include different configurations of components. In the embodiment of the present disclosure, the terminal may include, but is not limited to, a mobile phone, a tablet PC, a laptop, a palmtop PC, an in-vehicle terminal, a wearable device, a pedometer, etc.

[0193] Here, the processor 1210 transmits operation-related information from the first network to the second network when accessing the first network.

[0194] In the embodiments of the present disclosure, the following issues are clarified: 1) how to achieve continuity of related services when full coverage of the first network is not achieved; 2) how to achieve related services when the first network does not directly support the related services but receives requests established for the related services (e.g., PDU session establishment requests, QoS flow establishment requests, service requests, etc.); and 3) whether a terminal should reside in the first network when continuity of related services is not guaranteed in the first network.

[0195] In the embodiment of the present disclosure, the radio frequency unit 121 is used for transmitting and receiving information or signals during a call. Specifically, the radio frequency unit 121 receives downlink data from a base station, processes the data through the processor 1210, and transmits uplink data to the base station. Generally, the radio frequency unit 121 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a combiner, a low-noise amplifier, a duplexer, etc. The radio frequency unit 121 can also communicate with a network or other devices via a wireless communication system.

[0196] Through the network module 122, the terminal provides wireless broadband Internet access to the user, including support for sending and receiving email, browsing web pages, and accessing streaming media.

[0197] The audio output unit 123 can convert audio data received by the radio frequency unit 121 or the network module 122 or audio data stored in the memory 129 into audio signals and output them as audio. The audio output unit 123 may also output sounds (e.g., ringtones, message ringtones, etc.) related to specific functions performed by the terminal 120. The audio output unit 123 includes a speaker, a buzzer, a receiver, etc.

[0198] The input unit 124 is used to receive audio and video signals. The input unit 124 includes a graphics processor GPU (Graphics Processing Unit) 1241 that processes image data of still or moving images captured by an image capture device such as a camera in a video capture mode or an image capture mode, and a microphone 1242. The processed image frames are displayed on the display unit 126. The image frames processed by the graphics processor 1241 are stored in the memory 129 (or other storage medium) or transmitted via the radio frequency unit 121 or the network module 122. The microphone 1242 can receive audio and process it into audio data. In a telephone call mode, the processed audio data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 121 and output.

[0199] The terminal 120 further includes at least one sensor 125, such as a light sensor, a motion sensor, or other sensor. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor adjusts the brightness of the display panel 1261 according to the brightness of the ambient light, and the proximity sensor turns off the display panel 1261 and / or the backlight when the terminal 120 is moved to the ear. As a type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes) and can detect the magnitude and direction of gravity when stationary. This can be used for terminal orientation recognition (e.g., portrait / landscape screen switching, related games, magnetometer orientation calibration), vibration recognition-related functions (e.g., pedometer, stroke), etc. The sensor 125 can also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., but these are not listed here.

[0200] The display unit 126 is used to display information input by the user or information provided to the user, and may include a display panel 1261 made of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0201] The user input unit 127 accepts input of numeric and character information and is used by the user to input key signals related to terminal settings and function control. Specifically, the user input unit 127 includes a touch screen 1271 and other input devices 1272. The touch screen 1271, also referred to as a touch screen, can acquire a user's touch operation on or near the touch screen 1271 (for example, a user's operation on or near the touch screen 1271 using any suitable object or accessory, such as a finger or a stylus). The touch screen 1271 includes two parts: a touch detection device and a touch controller. Here, the touch detection device detects the user's touch direction and detects a signal resulting from the touch operation and transmits it to the touch controller. The touch controller receives touch information from the touch detection device, converts it into contact coordinates, and sends them to the processor 1210, and receives and executes commands from the processor 1210. The touch screen 1271 can be realized using various methods, such as a resistive type, a capacitive type, an infrared type, or a surface acoustic wave type. The user input unit 127 may include other input devices 1272 in addition to the touch screen 1271. Specifically, the other input devices 1272 include a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a lever, but these are not listed here.

[0202] Furthermore, touch screen 1271 is overlaid on display panel 1261. When touch screen 1271 detects a touch operation on or near it, it transmits the detected touch operation to processor 1210 to determine the type of touch event. Processor 1210 then provides a corresponding visual output to display panel 1261 according to the type of touch event. In FIG. 12 , touch screen 1271 and display panel 1261 are two independent components that implement the input / output functions of the terminal, but in some embodiments, touch screen 1271 and display panel 1261 can be integrated to implement the input / output functions of the terminal, and this is not specifically limited herein.

[0203] The interface unit 128 is an interface for connecting an external device to the terminal 120. For example, the external device may include a wired or wireless headphone port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, etc. The interface unit 128 may be used to receive input (e.g., data information, power, etc.) from the external device and transmit the received input to one or more units within the terminal 120, or may be used to transmit data between the terminal 120 and the external device.

[0204] The memory 129 is used to store software programs and various data. The memory 129 may mainly include a program storage area that can store an operating system, an application required for at least one function (e.g., audio playback function, image playback function, etc.), and a data storage area. The data storage area can store data generated in accordance with the use of the mobile phone, such as voice data and a phone book. Furthermore, the memory 129 may include a fast random access memory and may also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage device.

[0205] Processor 1210 is the control center of the terminal, connecting various components of the terminal using various interfaces and lines, executing software programs and / or modules stored in memory 129, accessing data stored in memory 129 to execute various functions and process data of the terminal, and monitoring the entire terminal. Processor 1210 may include one or more processing units. Optionally, processor 1210 may integrate an application processor that mainly processes the operating system, user interface, applications, etc., with a modem processor that mainly processes wireless communications. It is understood that the above-mentioned modem processor does not have to be integrated into processor 1210.

[0206] The terminal 120 may further include a power source 1212, such as a battery, for supplying power to each component unit. Optionally, the power source 1212 may be logically connected to the processor 1210 via a power management system, and may realize functions such as managing charging, discharging, and power consumption management through the power management system.

[0207] Furthermore, the terminal 120 may further include functional modules not shown, the description of which will be omitted here.

[0208] Optionally, an embodiment of the present disclosure further provides a first network unit including a processor, a memory, and a computer program stored in the memory and operable by the processor, and when the computer program is executed by the processor, each process of the embodiment of the above service realization method is realized and the same technical effects can be achieved, so to avoid duplication, they will not be described again here.

[0209] Optionally, an embodiment of the present disclosure further provides a second network unit including a processor, a memory, and a computer program stored in the memory and operable by the processor, and when the computer program is executed by the processor, each process of the embodiment of the above service realization method is realized and the same technical effects can be achieved, so to avoid duplication, they will not be described again here.

[0210] Optionally, an embodiment of the present disclosure further provides a terminal including a processor, a memory, and a computer program stored in the memory and operable by the processor, and when the computer program is executed by the processor, each process of the embodiment of the service realization method described above is realized and the same technical effects can be achieved, so to avoid duplication, they will not be described again here.

[0211] The embodiments of the present disclosure further provide a computer-readable storage medium storing a computer program, which, when executed by a processor, realizes the processes of the embodiments of the service realization method and achieves the same technical effects. Therefore, to avoid redundancy, the computer-readable storage medium may be, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0212] It should be noted that in this specification, the terms "comprise," "contain," and any other variations thereof mean a non-exclusive inclusion. Thus, a process, method, product, or apparatus that includes a set of units not only includes those units, but also includes other units not expressly listed, or units inherent in such process, method, product, or apparatus. Unless otherwise specified, a unit defined by the expression "comprises one of" does not exclude the presence of other identical units in the process, method, product, or apparatus that includes that unit.

[0213] From the description of the above embodiments, it is obvious to those skilled in the art that the methods of the above embodiments can be realized in the form of a general-purpose hardware platform that requires software, and of course, can also be realized by hardware, and in many cases the former is a more preferable embodiment. Based on this understanding, the substantial part of the technical means of the present disclosure or the part that contributes to the prior art appears in the form of a software product. The computer software product is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes several instructions that cause a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods of each embodiment of the present disclosure.

[0214] Although the embodiments of the present disclosure have been described above based on the drawings, the present disclosure is not limited to the specific embodiments described above. The specific embodiments described above are illustrative and not limiting. Many modifications that a person skilled in the art can make based on the hints of the present disclosure without departing from the spirit of the present disclosure and the scope of the claims are all included in the scope of protection of the present disclosure.

Claims

1. A service realization method applied to a first network unit located in a first network, comprising: Obtaining information related to an operation from the first network to the second network; Determine whether a CS switch from the first network to the second network is possible based on the related information of the operation from the first network to the second network, and determine an indication of whether a related service is supported based on whether the CS switch from the first network to the second network is possible; sending an indication of whether the related service is supported to the terminal; Including, the associated service includes one of a voice service and an emergency service; The indication of whether the related service is supported is: Indication of whether IMS voice services are supported; Indication of whether IMS voice services over packet-switched domain are supported; Indication information on whether the IMS voice service accessing PS domain session method according to 3GPP is supported; Indication information on whether IMS voice service over CS is supported; Indication of whether emergency services are supported; An indication of whether emergency services fallback is supported; A service realization method including at least one of the above.

2. The related information of the operation from the first network to the second network is: whether the first network has associated interfaces configured to support the operation of the first network and the second network; a related interface mode of operation from the first network to the second network established in the first network; Second network capability information of the terminal; Information on whether the terminal supports operation from a first network to a second network; information whether the network unit of the first network supports operation from the first network to the second network; Whether the terminal allows operation from the first network to the second network; the terminal's Network Protocol Multimedia Subsystem (IMS) session transition number; Information on whether an IMS session transition number of the terminal exists; the mobile station international subscriber identifier of said terminal; whether the mobile station international subscriber identifier of the terminal exists; Whether the terminal ID of the terminal in the first network can be mapped to the terminal ID in the second network; whether the carrier is configured to support the related service by operation from the first network to the second network; whether the carrier is configured to support continuity of the related service by operation from the first network to the second network; Whether the wireless conditions of the terminal satisfy the operation from the first network to the second network; and The related interface manner from the first network to the operation of the second network is: the first network operating with the second network via a direct interface; the first network interoperates with the third network, and the interoperation between the third network and the second network realizes the operation of the first network and the second network; and The operation from the first network to the second network includes: An operation related to CS switching from the first network to the second network. The service realization method according to claim 1.

3. the first network is a 5G network; the second network is a 3G network; The service realization method according to claim 1.

4. The first network unit The terminal; a core network network unit of a first network; a radio access network network unit of a first network; a network unit of a third network; a network unit of a second network; The service realization method according to claim 1 , further comprising obtaining information related to the operation from the first network to the second network from at least one of the following:

5. When the first condition is satisfied, the instruction information transmitted to the terminal as to whether the related service is supported or not is specifically IMS voice service support indication, IMS voice over PS Session Supported Indication, IMS voice over PS Session Supported Indication over 3GPP; IMS voice service support indication by CS (Circuit Switch) domain; Instructions to support emergency services; and an indication that emergency services fallback is supported; The first condition is The service realization method of claim 1 , including enabling CS switching from the first network to the second network.

6. When a second condition is satisfied, the instruction information as to whether the related service is supported indicates that the related service is not supported, and the second condition is: The method of claim 1 , further comprising not supporting CS switching from the first network to the second network.

7. A service realization method applied to a communication device located in a first network, comprising: the communication device is a terminal, The service realization method includes: Sending information related to the operation from the first network to the second network to a first network unit in the first network; receiving an indication from the first network unit of whether a related service is supported; The information related to the operation from the first network to the second network is used to determine whether a CS switch from the first network to the second network is possible, and whether the CS switch from the first network to the second network is possible is used to determine an indication information of whether the related service is supported; the associated service includes one of a voice service and an emergency service; The indication of whether the related service is supported is: Indication of whether IMS voice services are supported; Indication of whether IMS voice services over packet-switched domain are supported; Indication information on whether the IMS voice service accessing PS domain session method according to 3GPP is supported; Indication information on whether IMS voice service over CS is supported; Indication of whether emergency services are supported; An indication of whether emergency services fallback is supported; A service realization method including at least one of the above.

8. The related information of the operation from the first network to the second network is: whether the first network has associated interfaces configured to support the operation of the first network and the second network; a related interface mode of operation from the first network to the second network established in the first network; Second network capability information of the terminal; Information on whether the terminal supports operation from a first network to a second network; information whether the network unit of the first network supports operation from the first network to the second network; Whether the terminal allows operation from the first network to the second network; the IMS session transition number of the terminal; Information on whether the IMS session transition number of the terminal exists; the mobile station international subscriber identifier of said terminal; whether the mobile station international subscriber identifier of the terminal exists; Whether the terminal ID of the terminal in the first network can be mapped to the terminal ID in the second network; whether the carrier is configured to support the related service by operation from the first network to the second network; whether the carrier is configured to support continuity of the related service by operation from the first network to the second network; Whether the wireless conditions of the terminal satisfy the operation from the first network to the second network; and The related interface manner from the first network to the operation of the second network is: the first network operating with the second network via a direct interface; the first network interoperates with the third network, and the interoperation between the third network and the second network realizes the operation of the first network and the second network; The service realization method according to claim 7, comprising at least one of:

9. The operation from the first network to the second network includes: Operations related to CS switching from the first network to the second network; The service realization method of claim 7, comprising:

10. a first network unit located in a first network, an acquisition module for acquiring information related to an operation from the first network to the second network; a determination module for determining whether a CS switch from the first network to the second network is possible according to the related information of the operation from the first network to the second network, and determining, according to whether the CS switch from the first network to the second network is possible, information indicating whether a related service is supported; a sending module for sending indication information of whether the related service is supported to a terminal; Including, the associated service includes one of a voice service and an emergency service; The indication of whether the related service is supported is: Indication of whether IMS voice services are supported; Indication of whether IMS voice services over packet-switched domain are supported; Indication information on whether the IMS voice service accessing PS domain session method according to 3GPP is supported; Indication information on whether IMS voice service over CS is supported; Indication of whether emergency services are supported; An indication of whether emergency services fallback is supported; a first network unit including at least one of:

11. The related information of the operation from the first network to the second network is: whether the first network has associated interfaces configured to support the operation of the first network and the second network; a related interface mode of operation from the first network to the second network established in the first network; Second network capability information of the terminal; Information on whether the terminal supports operation from a first network to a second network; information whether the network unit of the first network supports operation from the first network to the second network; Whether the terminal allows operation from the first network to the second network; the terminal's Network Protocol Multimedia Subsystem (IMS) session transition number; Information on whether an IMS session transition number of the terminal exists; the mobile station international subscriber identifier of said terminal; whether the mobile station international subscriber identifier of the terminal exists; Whether the terminal ID of the terminal in the first network can be mapped to the terminal ID in the second network; whether the carrier is configured to support the related service by operation from the first network to the second network; whether the carrier is configured to support continuity of the related service by operation from the first network to the second network; Whether the wireless conditions of the terminal satisfy the operation from the first network to the second network; and The related interface manner from the first network to the operation of the second network is: the first network operating with the second network via a direct interface; the first network interoperates with the third network, and the interoperation between the third network and the second network realizes the operation of the first network and the second network; and The operation from the first network to the second network includes: The first network unit according to claim 10, wherein the operation is related to CS switching from the first network to the second network.

12. the first network is a 5G network; The first network unit according to claim 10, wherein the second network is a 3G network.

13. When the first condition is satisfied, the instruction information on whether the related service is supported or not, which is transmitted from the transmission module to the terminal, is specifically: IMS voice service support indication, IMS voice over PS Session Supported Indication, IMS voice over PS Session Supported Indication over 3GPP; IMS voice service support indication by CS (Circuit Switch) domain; Instructions to support emergency services; and an indication that emergency services fallback is supported; The first condition is The first network unit of claim 10, including being capable of CS switching from the first network to the second network.

14. When a second condition is satisfied, the instruction information as to whether the related service is supported instructs that the related service is not supported, and the second condition is: The first network unit of claim 10 , including not supporting CS switching from the first network to the second network.

15. a communication device located in a first network, the communication device is a terminal, The communication device includes a transmitting module for transmitting operation-related information from the first network to the second network to a first network unit in the first network; an acquisition module for receiving, from the first network unit, an indication of whether a related service is supported; The information related to the operation from the first network to the second network is used to determine whether a CS switch from the first network to the second network is possible, and whether the CS switch from the first network to the second network is possible is used to determine an indication information of whether the related service is supported; the associated service includes one of a voice service and an emergency service; The indication of whether the related service is supported is: Indication of whether IMS voice services are supported; Indication of whether IMS voice services over packet-switched domain are supported; Indication information on whether the IMS voice service accessing PS domain session method according to 3GPP is supported; Indication information on whether IMS voice service over CS is supported; Indication of whether emergency services are supported; An indication of whether emergency services fallback is supported; A communication device comprising at least one of the following:

16. A computer-readable storage medium storing a program, A computer-readable storage medium that, when the program is executed by a processor, realizes the service realization method according to any one of claims 1 to 6.

17. A computer-readable storage medium storing a program, A computer-readable storage medium that, when the program is executed by a processor, realizes the service realization method according to any one of claims 7 to 9.

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