WO2020142960A1 - Network communication method and apparatus, and network device - Google Patents

Abstract

Embodiments of the present application provide a network communication method and apparatus, and a network device. The method comprises: in the case that a terminal accesses a second network from a first network, the access network element of the second network receives a first bearer or a data stream setup/modification request message transmitted by a first core network element; and based on a target event, the access network element of the second network triggers the terminal to return to the first network.

Description

Network communication method and device, and network equipment Technical field

Embodiments of the present application relate to the technical field of mobile communications, and in particular, to a network communication method and device, and network equipment.

Background technique

Fifth generation (5G, 5 ^th Generation) mobile communication system is also called a new radio (NR, New Radio) system, the initial deployment network 5G 5G or in the case of network congestion, the network may not support voice 5G on NR ( VoNR, voice over New Radio), 5G 5G network needs to trigger from the network to the fourth generation (4G, 4 ^th Generation) network switch or redirect the flow process, the voice network 4G long term evolution (VoLTE, voice over long Term Evolution) completes the voice service of the terminal.

At present, after the terminal completes the VoLTE voice service, there is no mechanism for the terminal that specifically performs the 5G to 4G fallback to establish the voice service to trigger its rapid return to the 5G network, which affects the terminal's experience on the 5G network.

Summary of the invention

Embodiments of the present application provide a network communication method, device, and terminal.

The network communication method provided by the embodiments of the present application includes:

When the terminal accesses from the first network to the second network, the access network element of the second network receives the first bearer or data stream establishment/modification request message sent by the first core network element;

The access network element of the second network triggers the terminal to return to the first network based on the target event.

The network communication device provided by the embodiment of the present application includes:

The receiving unit is configured to receive a first bearer or data stream establishment/modification request message sent by a network element of the first core network when the terminal accesses the first network to the second network;

The trigger unit is configured to trigger the terminal to return to the first network based on the target event.

The network device provided by the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the network communication method described above.

The chip provided by the embodiment of the present application is used to implement the above network communication method.

Specifically, the chip includes a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the above-mentioned network communication method.

The computer-readable storage medium provided by the embodiment of the present application is used to store a computer program, and the computer program enables the computer to execute the network communication method described above.

The computer program product provided by the embodiment of the present application includes computer program instructions, and the computer program instructions cause the computer to execute the network communication method described above.

The computer program provided by the embodiment of the present application causes the computer to execute the above-mentioned network communication method when it runs on the computer.

Through the above technical solution, the terminal falls back from the 5G network to the 4G network to perform specific services (such as voice services), and can quickly return to the 5G network after the specific service ends, so that the terminal can use the 5G network to the maximum extent, ensuring that the terminal is in 5G The experience of using the network. The technical solution of the embodiment of the present application realizes the fast return function of the network without affecting the MME, and has little impact on the 5G system and the 4G system, which is easy to implement.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an undue limitation on the present application. In the drawings:

1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

2 is a system architecture diagram of a 5G network according to an embodiment of this application;

FIG. 3 is a system architecture diagram of a 4G network according to an embodiment of this application;

4 is a schematic diagram of a handover (HO, Handover) process according to an embodiment of the present application;

FIG. 5(a) is a first schematic flowchart of a network fallback according to an embodiment of the present application;

5(b) is a second schematic flowchart of a network fallback according to an embodiment of the present application;

FIG. 6(a) is a flowchart of triggering the establishment of a dedicated bearer QCI=1 on the EPC;

6(b) is a flow chart of triggering the establishment of a proprietary data stream 5QI=1 on 5GC;

7 is a schematic flowchart of a network communication method provided by an embodiment of this application;

Figure 8(a) is a schematic diagram of the EPS Fallback process;

Figure 8(b) is a schematic diagram of the flow of RAT Fallback;

9 is a schematic structural diagram of a network communication device provided by an embodiment of the present application;

10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

11 is a schematic structural diagram of a chip according to an embodiment of the present application;

12 is a schematic block diagram of a communication system provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: Global Mobile System (Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, Broadband Code Division Multiple Access) (Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time division duplex (Time Division Duplex, TDD), universal mobile communication system (Universal Mobile Telecommunication System, UMTS), global interconnection microwave access (Worldwide Interoperability for Microwave Access, WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal 120 (or referred to as a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminals located within the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or a wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, an in-vehicle device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks or network devices in future public land mobile networks (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal 120 located within the coverage of the network device 110. As used herein, "terminals" include but are not limited to connections via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Lines (DSL), digital cables, and direct cable connections; And/or another data connection/network; and/or via a wireless interface, eg for cellular networks, wireless local area networks (Wireless Local Area Network, WLAN), digital TV networks such as DVB-H networks, satellite networks, AM-FM Broadcast transmitter; and/or another terminal is set to receive/transmit communication signals; and/or Internet of Things (IoT) equipment. A terminal configured to communicate through a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communication Systems (PCS) terminals that can combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; may include radiotelephones, pagers, Internet/internal PDA with networked access, web browser, notepad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palm-type receivers or others including radiotelephone transceivers Electronic device. Terminal can refer to access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user Device. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital processing (Personal Digital Assistant (PDA), wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminals in 5G networks, or terminals in future evolved PLMNs, etc.

Optionally, terminal 120 may perform terminal direct connection (Device to Device, D2D) communication.

Alternatively, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

FIG. 1 exemplarily shows one network device and two terminals. Optionally, the communication system 100 may include multiple network devices and each network device may include other numbers of terminals within the coverage area. Embodiments of the present application There is no restriction on this.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, etc. This embodiment of the present application does not limit this.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 110 and a terminal 120 having a communication function, and the network device 110 and the terminal 120 may be the specific devices described above, which will not be repeated here; communication The device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiments of the present application.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship that describes an associated object, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, exist alone B these three cases. In addition, the character “/” in this article generally indicates that the related objects before and after it are in an “or” relationship.

FIG. 2 is a system architecture diagram of a 5G network according to an embodiment of the present application. As shown in FIG. 2, the devices involved in the 5G network system include:

Terminal (UE, User Equipment), radio access network (RAN, Radio Access Network), user plane function (UPF, User Plane Function), data network (DN, Data Network), receiving core access and mobility management (AMF , Core Access and Mobility Management Function), session management function (SMF, Session Management Function), policy control function (PCF, Policy Control Function), application function (AF, Application Function), authentication server function (AUSF, Authentication Server Function) ), Unified Data Management (UDM, Unified Data Management).

FIG. 3 is a system architecture diagram of a 4G network according to an embodiment of the present application. As shown in FIG. 3, the devices involved in the 4G network system include:

Terminal (UE, User Equipment), Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network), mobility management function (MME, Mobility Management Entity) network element, service GPRS support node (SGSN, Serving GPRS Support Node, Home Subscriber Server (HSS, Home Subscriber Server), Service Gateway (Serving Gateway), Packet Data Gateway (PDN Gateway, Packet Data, Network Gateway), Policy and Charging Rules Functional Unit (PCRF, Policy and Charging Rules Function).

The above examples of FIG. 2 and FIG. 3 are only an example of a network architecture that implements the embodiments of the present application, and the embodiments of the present application are not limited to the network structures described in FIGS. 2 and 3 above.

5G voice has been identified as VoIMS (VoNR). The 3rd Generation Partnership Project (3GPP, 3rd Generation, Partnership, Project) defines the registration process and session establishment process. In order to facilitate the understanding of the technical solutions of the embodiments of this application, the following implementation of this application Examples are related to related technologies.

1. Registration and session establishment process

In a 5G network, the terminal needs to be registered on the 5G network to perform related 5G services. The 5G network registration process is different from the 4G network attachment process. The registration process in the 5G network does not include the session establishment process, which means that the session establishment process can not be performed when the terminal is registered. The AMF will provide information related to the session (such as non-independent Networking (NSA, Non-Standalone) information is sent to the SMF through the N11_Request message on the N11 interface, and the SMF decides whether to trigger the session establishment process.

The two processes of registration and session establishment are the most basic and important processes of 5G mobile management (MM) and session management (SM). In this embodiment of the present application, a "voice support" logo is added to the UE in the registration process to report to the network. Send to SMF through NAS-SM message, and add "voice support" mark in UDM, and send to SMF through subscription data response (Subscription data response) message in the session establishment process. It is for the SMF to make a judgment when it falls from 5G to 4G.

FIG. 4 is a schematic diagram of a handover (HO, Handover) process according to an embodiment of the present application. The example in FIG. 4 describes a process of switching from a 5G network to a 4G network.

2. Voice drop process

In the early stage of 5G network deployment or when 5G network is congested, 5G network may not support VoNR. 5G network needs to trigger 5G→4G Handover process or Redirection process (as shown in Figures 5(a) and 5(b) (Shown), let the 4G network perform VoLTE to complete the UE's request for voice establishment. The 5G->4G Handover process or Redirection process includes the following three types:

1)Wireless access handover (RAT Handover, Radio Access Technologies Handover)

That is, the 5G core network remains unchanged. When the UE needs to perform voice, the RAT falls back, the RAT access changes from NR to LTE, and then the VoLTE operation is performed.

2) Evolved packet system switching (EPS Handover, Evolved Packet System Handover)

That is, the 5G core network is switched to the 4G core network, and the RAT will also change from NR to LTE, and then the VoLTE operation is performed.

3) RRC Redirection

The base station of the 5G network directly sends an RRC Connection Release (RRC Connection Release) message to the UE, and carries the cell information (Cell ID) and frequency (Frequency Band) information of the target network (such as a 4G network).

The above 1), 2) and 3) are all triggered by the RAN (ie NG-RAN) on the 5G network side.

During the fallback process from 5G network to 4G network, the following three situations will occur:

1) The 5G core network (5GC) remains unchanged, and the AMF does not change during the fallback of the RAT.

In this case, the NG-RAN will send a rejection indication to the AMF in step 5b shown in FIG. 5(b), indicating that the rejection is caused by the ongoing HO. After completing the HO, the AMF is responsible for immediately triggering the establishment of the QCI=1 bearer.

2) The 5GC remains unchanged, and the AMF changes during the fall of the RAT.

In this case, the NG-RAN will send a reject indication to the AMF in step 5b shown in FIG. 5(b), indicating that the reject is caused by the ongoing HO. When the AMF changes, the AMF will send a reject indication to the SMF, indicating that the 5QI=1 stream sent by the SMF has not been successfully established because the HO is in progress. After the HO is completed, the SMF is responsible for immediately triggering the establishment of the QCI=1 bearer.

3) The 5GC→4G core network (EPC) falls back, and the RAT is also switched from NR→LTE (ie EPS Fallback).

In this case, during the cross-system handover process, SMF is a combined module of SMF and PGW-C (generally called SMF+PGW-C). This module is responsible for triggering QCI=1 bearer immediately after completing the cross-system handover. set up.

3. The establishment process

The process of triggering the establishment of the dedicated bearer QCI=1 on the EPC is shown in FIG. 6(a), and the process of triggering the establishment of the proprietary data stream 5QI=1 on the 5GC is shown in FIG. 6(b).

FIG. 7 is a schematic flowchart of a network communication method provided by an embodiment of the present application. As shown in FIG. 7, the network communication method includes the following steps:

Step 701: When the terminal accesses from the first network to the second network, the access network element of the second network receives the first bearer or data stream establishment/modification request message sent by the first core network element.

In the embodiment of the present application, the terminal may be any device that can communicate with a network, such as a mobile phone, a notebook, a tablet computer, or a vehicle-mounted terminal.

In the embodiment of the present application, the first bearer or data stream establishment/modification request message may be: a first bearer establishment request message, or a first bearer modification request message, or a first data stream establishment request message, or a first Data stream modification request message.

In the embodiment of the present application, the first network is a 5G network, and the second network is a 4G network. It should be noted that the first network and the second network in the embodiment of the present application are not limited thereto, and as the network system evolves, the first network and the second network may also be other types of networks For example, the first network is an enhanced 5G (5G-A) network, and the second network is a 5G network.

In the embodiment of the present application, when the terminal needs to execute a specific service, the specific service needs to be executed under the second network, and the terminal will access the second network from the first network, also known as the terminal falling back from the first network to the 2. Network. For example, when the terminal needs to perform voice service or video service, it will fall back from 5G network to 4G network.

Here, the fallback of the terminal from the 5G network to the 4G network includes the following two cases:

Case 1: EPS fallback (EPS Fallback)

In the case of EPS fallback, the core network corresponding to the first network and the second network are different, and the access network is different. When the terminal falls back from the first network EPS to the second network, both the access network and the core network change. For example: the access network changes from NG-RAN to E-UTRAN, and the core network changes from 5GC to EPC.

Case 1: RAT Fallback

When the RAT falls back, the core network corresponding to the first network and the second network are the same, and the access network is different. When the terminal falls back from the first network RAT to the second network, the access network changes and the core network remains unchanged. For example: the access network changes from NR to LTE, and the core network remains unchanged at 5GC.

In the embodiment of the present application, the access network element of the second network receives the first bearer establishment request message sent by the first core network element, as shown in FIG. 6(a), in FIG. 6(a) is EPC The process of triggering the establishment of the dedicated bearer QCI=1 is triggered; the access network element of the second network receives the first data flow establishment request message sent by the first core network element, as shown in FIG. 6(b). In (b), the 5GC triggers the establishment of the proprietary data stream 5QI=1.

It should be noted that in the case of EPS fallback, the first bearer in the embodiment of the present application may be, but not limited to, a proprietary bearer QCI=1. In the case where the RAT falls back, the first data stream in the embodiment of the present application may be, but not limited to, a proprietary data stream 5QI=1. Any establishment of a proprietary bearer or a proprietary data stream for a specific service is applicable to the technical solution of this application.

In the embodiment of the present application, the terminal may access the second network from the first network through handover or redirection.

Step 702: The access network element of the second network triggers the terminal to return to the first network based on the target event.

In the embodiment of the present application, the access network element of the second network triggers the terminal to return to the first network based on the target event, which occurs after the first bearer or the data stream is released. That is, after the first bearer or data stream is released, the access network element of the second network triggers the terminal to return to the first network based on the target event.

In the embodiment of the present application, the access network element of the second network triggers the terminal to return to the first network based on the target event, which may be implemented in the following manner:

Manner 1: The access network element of the second network triggers the terminal to return to the first network based on the first indication information; wherein the first indication information is included in the first bearer or data stream In the build request/modification message. Further, the first indication information includes at least one of the following: fallback indication information corresponding to a specific service, an identification of the first network, an identification of initiating a first bearer or data flow establishment/modification for a specific service, and first time information , The first time information is used to determine the moment that triggers the terminal to return to the first network.

Here, the identifier of the first network may be, but not limited to, the PLMN ID of the first network. The identification of the second network may be, but not limited to, the PLMN ID of the second network.

It should be noted that, after receiving the first indication information, the access network element of the second network may immediately trigger the terminal to return to the first network, or wait for a certain period of time to trigger the terminal to return to the The first network, or trigger the terminal to return to the first network after waiting for a specific event to occur. For example, when the first indication information includes the target time value, the terminal starts timing after receiving the first indication information. When the counted time reaches the target time value, the terminal is triggered to return to all Describe the first network.

In an application example, when the terminal falls back from the 5G network to the 4G network, it needs to (re)initiate a dedicated bearer QCI=1 establishment request message to the target base station (eNodeB), where the establishment request message may carry the first Indication information, the first indication information includes fallback indication information corresponding to a specific service and/or the identifier and/or target time value of the first network, the first indication information is used to notify the target base station (eNodeB) of the current fallback It is the fallback of a specific service (such as voice fallback or video fallback). Then the target base station (eNodeB) triggers the terminal to return to the original network (5G network) after the dedicated bearer QCI=1 is released.

Manner 2: When the access network element of the second network receives the first bearer or data stream establishment/modification request message within the first time period after the terminal accesses, it triggers the terminal to return to the Describe the first network.

For example: when the terminal falls back from the 5G network to the 4G network, it needs to (re)initiate a dedicated bearer QCI=1 establishment request message to the target base station (eNodeB). After the terminal is connected to the 4G base station (eNodeB), the eNodeB When a dedicated bearer QCI=1 establishment request message is received within a certain time (a timer can be set), after the dedicated bearer QCI=1 is released, the terminal is triggered to return to the original network (5G network).

In the embodiment of the present application, the first core network element that triggers the first bearer or data flow establishment/modification request message has the following two situations:

Case 1: In the case of EPS fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is a joint network element of SMF and PGW-C; where, the EPS falls back Both the access network and the core network have changed.

The EPSFallback process is shown in Figure 8(a). The proprietary data flow establishment request sent by the 5GC network element is rejected in step 4 and will also carry a cause value. This cause value is used to indicate that the reason for rejection is due to a specific service. Implementation, for example, the reason value can be expressed as: "mobility due to fallback for IMS voice isongoing", and then in step 7, the EPC network element will trigger the establishment of a dedicated bearer, add the first indication information in this message, Including fallback indication information corresponding to a specific service (such as voice) and/or the identification of the first network and/or the identification of the establishment of a dedicated bearer or a dedicated data stream for the specific service and/or a specific time value (time to time Trigger return), the basis for sending the first indication information may be that a specific cause value has been received in the previous step. Then in step 8, a connection for a specific service (such as a voice connection) is established. After the specific service ends, the eNodeB triggers the terminal to return to the original network according to the first indication information previously received. Here, after the dedicated bearer or the dedicated data stream corresponding to the specific service is released, it indicates that the specific service ends. In one example, the specific service is a voice service, and in another example, the specific service is a video service. In addition, the above dedicated bearer is, for example, a dedicated bearer QCI=1, and the dedicated data stream is, for example, a dedicated data stream 5QI=1

In the case of EPS Fallback, the network element that triggers the re-establishment of the dedicated bearer QCI=1 is SMF+PGW-C (that is, the joint network element of SMF and PGW-C). Throughout the process, MME can process messages from PGW-C as usual. For example, referring to FIG. 6(a), PGW-C carries the first indication in steps 2 and 3, and after receiving the message in step 3, the MME processes the obtained message in the message in step 4 according to the existing method. Send to eNodeB.

Case 2: In the case of a RAT fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is AMF; where, when the RAT falls, the access network changes and the core The net remains unchanged.

The RAT Fallback process is shown in FIG. 8(b). Similar to EPS Fallback, NG-RAN carries the first indication information to the base station in the step 6 message. In the case of RAT Fallback, the network element that triggers the reestablishment of the proprietary data stream 5QI=1 is AMF. Referring to FIG. 6(b), the AMF carries the first indication information to the NG-RAN base station in step 4 to establish a dedicated data stream, or the SMF carries the first indication information to the base station on the NG-RAN side in step 4. , AMF processes according to the existing method, and sends a dedicated data stream establishment request to the access network.

Manner 3: When the network element of the access network receives the first bearer or data flow establishment/modification request message, if the first bearer or data flow establishment/modification request message carries the first indication information, it may An indication information to determine the access target network and/or the time to access the target network and/or the conditions to access the target network, wherein the first indication information may include at least one of the following:

1. The original network identification, such as the original network's PLMN ID;

2. The identification of the target network, such as the PLMN ID of the target network;

3. Initiating the establishment of the first bearer or data flow for a specific service;

4. Second time information, the second time information is used to determine the time to access the target network;

5. Conditions for accessing the target network.

Here, the original network refers to the original network that the terminal currently accesses, and the target network refers to the target network that the terminal needs to access.

Here, the condition for accessing the target network is, for example, when it is detected that the signal quality of the original network is lower than the first threshold and/or the signal quality of the target network is higher than the second threshold, then the target network is accessed.

Further, the first indication information may be included in step 2/3/4 of FIG. 6(a) in the EPS system and step 3/4 of FIG. 6(b) in the 5GS system.

In the embodiment of the present application, the network side triggers the terminal to return to the first network through the following return:

Method 1: Initiate a handover or redirection process to the terminal, and trigger the terminal to return to the first network through the handover or redirection.

For example, after the terminal completes the call, that is, after the eNodeB completes the release of the proprietary bearer QCI=1, the eNodeB initiates a handover or redirection process to the terminal, and connects the terminal back to 5GS, specifically, including LTE/5GC or NR/ 5GC.

Method 2: Send an RRC release message to the terminal to release the RRC connection, so that the terminal reselects to the cell of the first network.

For example: After the terminal completes the call and releases the dedicated bearer QCI=1, the eNodeB or MME sends an RRC release message to the terminal to release the RRC connection, and then reselects to the cell of the 5G network. Here, the cell reselection can be However, it is not limited to cell reselection based on frequency priority information, or the RRC connection release message contains information of the target access network, and cell reselection is performed based on the information of the target access network.

In the embodiment of the present application, when the terminal performs a specific service (such as a voice service) under the second network, if the specific service does not end, the terminal is not triggered to return to the first network, only after the specific service ends After the first bearer or data stream release is released, the terminal is triggered to return to the first network.

FIG. 9 is a schematic structural composition diagram of a network communication device provided by an embodiment of the present application. As shown in FIG. 9, the network communication device includes:

The receiving unit 901 is configured to receive the first bearer or data stream establishment/modification request message sent by the first core network element when the terminal accesses the first network to the second network;

The triggering unit 902 is configured to trigger the terminal to return to the first network based on the target event.

In an embodiment, the trigger unit 902 is configured to trigger the terminal to return to the first network based on a target event after the first bearer or data stream is released.

In an embodiment, the trigger unit 902 is configured to trigger the terminal to return to the first network based on the first indication information; wherein the first indication information is included in the first bearer or data stream Create/modify request message.

In an embodiment, the first indication information includes at least one of the following:

Fallback indication information corresponding to a specific service, the identification of the first network, the identification of the second network, the identification of initiating the establishment of the first bearer or data flow for the specific service, and a target time value, the target time value is used to determine The moment when the terminal is triggered to return to the first network.

In an embodiment, the specific service includes at least a voice or video service.

In an embodiment, the trigger unit 902 is configured to receive the first bearer or data stream establishment/modification request message within the first time duration after the terminal accesses, and then trigger the terminal to return to the Describe the first network.

In an embodiment, the trigger unit 902 is configured to initiate a handover or redirection process to the terminal, and trigger the terminal to return to the first network through the handover or redirection.

In an embodiment, the triggering unit 902 is configured to send an RRC release message to the terminal to release the RRC connection, so that the terminal reselects to the cell of the first network.

In an embodiment, the terminal accessing from the first network to the second network includes:

The terminal accesses the second network from the first network through handover or redirection.

In an embodiment, when the EPS falls back, the core network corresponding to the first network and the second network are different, and the access network is different.

In an embodiment, when the RAT falls back, the core network corresponding to the first network and the second network are the same, and the access network is different.

In an embodiment, in the case of EPS fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is a joint network element of SMF and PGW-C.

In an embodiment, in the case where the RAT falls back, the first core network element that triggers the first bearer or data flow establishment/modification request message is AMF.

In an embodiment, the receiving unit 901 is configured to receive a first bearer or data stream establishment/modification request message sent by a core network element; the device further includes a determining unit (not shown in the figure) for If the first bearer or data flow establishment/modification request message carries first indication information, determine the target network to access and/or the time to access the target network and/or access target according to the first indication information The conditions of the network. Wherein, the first indication information includes at least one of the following:

The identifier of the original network, the identifier of the target network, the identifier for initiating the establishment of the first bearer or data stream for a specific service, and second time information, where the second time information is used to determine the time to access the target network and the access target The conditions of the network.

Those skilled in the art should understand that the relevant description of the above network communication device in the embodiments of the present application can be understood with reference to the relevant description of the network communication method in the embodiments of the present application.

10 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application. The communication device may be a network device. The communication device 600 shown in FIG. 10 includes a processor 610. The processor 610 may call and run a computer program from a memory to implement the method in the embodiments of the present application.

Optionally, as shown in FIG. 10, the communication device 600 may further include a memory 620. The processor 610 can call and run a computer program from the memory 620 to implement the method in the embodiments of the present application.

The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Optionally, as shown in FIG. 10, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send information or data to other devices, or receive other Information or data sent by the device.

Among them, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 600 may specifically be a network device according to an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. .

Optionally, the communication device 600 may specifically be the mobile terminal/terminal of the embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application. This will not be repeated here.

11 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 700 shown in FIG. 11 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 11, the chip 700 may further include a memory 720. The processor 710 can call and run a computer program from the memory 720 to implement the method in the embodiments of the present application.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, no further description is provided here.

Optionally, the chip can be applied to the mobile terminal/terminal in the embodiments of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiments of the present application. Repeat.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-level chips, system chips, chip systems, or system-on-chip chips.

12 is a schematic block diagram of a communication system 900 provided by an embodiment of the present application. As shown in FIG. 12, the communication system 900 includes a terminal 910 and a network device 920.

The terminal 910 may be used to implement the corresponding functions implemented by the terminal in the above method, and the network device 920 may be used to implement the corresponding functions implemented by the network device in the above method.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip, which has signal processing capabilities. In the implementation process, the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor. The aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or other available Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically Erase Programmable Read Only Memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to these and any other suitable types of memories.

It should be understood that the foregoing memory is exemplary but not limiting, for example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data) SDRAM (DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memories in the embodiments of the present application are intended to include but are not limited to these and any other suitable types of memories.

Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the mobile terminal/terminal in each method of the embodiments of the present application, in order to It is concise and will not be repeated here.

An embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. Repeat again.

Optionally, the computer program product can be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application, for simplicity And will not be repeated here.

An embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. And will not be repeated here.

Alternatively, the computer program can be applied to the mobile terminal/terminal in the embodiments of the present application, and when the computer program runs on the computer, the computer is allowed to execute the corresponding implementation of the mobile terminal/terminal in each method of the embodiments of the present application For the sake of brevity, I will not repeat them here.

Those of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, Read-Only Memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (35)

1. A network communication method, the method includes:

   When the terminal accesses from the first network to the second network, the access network element of the second network receives the first bearer or data stream establishment/modification request message sent by the first core network element;

   The access network element of the second network triggers the terminal to return to the first network based on the target event.
2. The method according to claim 1, wherein the access network element of the second network triggers the terminal to return to the first network based on a target event, which occurs after the first bearer or data stream is released .
3. The method according to claim 1 or 2, wherein the access network element of the second network triggering the terminal to return to the first network based on the target event includes:

   The access network element of the second network triggers the terminal to return to the first network based on the first indication information; wherein the first indication information is included in the first bearer or data flow establishment/modification In the request message.
4. The method according to claim 3, wherein the first indication information includes at least one of the following:

   Fallback indication information corresponding to a specific service, an identifier of the first network, an identifier that initiates the establishment of a first bearer or data flow for a specific service, and first time information, where the first time information is used to determine to trigger the terminal to return to The moment of the first network.
5. The method according to claim 4, wherein the specific service includes at least a voice or video service.
6. The method according to claim 1 or 2, wherein the access network element of the second network triggering the terminal to return to the first network based on the target event includes:

   When the access network element of the second network receives the first bearer or data stream establishment/modification request message within the first time duration after the terminal accesses, it triggers the terminal to return to the first The internet.
7. The method according to any one of claims 1 to 6, wherein the triggering the terminal to return to the first network includes:

   Initiate a handover or redirection process to the terminal, and trigger the terminal to return to the first network through the handover or redirection.
8. The method according to claim 7, wherein the triggering the terminal to return to the first network by redirecting includes:

   Sending an RRC release message to the terminal to release the RRC connection, so that the terminal reselects to the cell of the first network.
9. The method according to any one of claims 1 to 8, wherein the access of the terminal from the first network to the second network includes:

   The terminal accesses the second network from the first network through handover or redirection.
10. The method according to any one of claims 1 to 9, wherein, in the case of EPS fallback, the core network corresponding to the first network and the second network are different, and the access network is different.
11. The method according to any one of claims 1 to 9, wherein, in a RAT fallback situation, the core network corresponding to the first network and the second network are the same, and the access networks are different.
12. The method according to any one of claims 1 to 10, wherein, in the case of EPS fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is SMF and PGW-C Jointly set up network elements.
13. The method according to any one of claims 1 to 9, 11, wherein, in a RAT fallback situation, the first core network element that triggers the first bearer or data flow establishment/modification request message is AMF.
14. A network communication method, the method includes:

    The access network element receives the first bearer or data stream establishment/modification request message sent by the core network element;

    If the first bearer or data flow establishment/modification request message carries first indication information, determine the target network to be accessed and/or the time and/or time to access the target network according to the first indication information Conditions for accessing the target network.
15. The method according to claim 14, wherein the first indication information includes at least one of the following:

    The identifier of the original network, the identifier of the target network, the identifier for initiating the establishment of the first bearer or data stream for a specific service, and second time information, where the second time information is used to determine the time to access the target network and the access target The conditions of the network.
16. A network communication device, the device includes:

    The receiving unit is configured to receive a first bearer or data stream establishment/modification request message sent by a network element of the first core network when the terminal accesses the first network to the second network;

    The trigger unit is configured to trigger the terminal to return to the first network based on the target event.
17. The apparatus according to claim 16, wherein the trigger unit is configured to trigger the terminal to return to the first network based on a target event after the first bearer or data stream is released.
18. The apparatus according to claim 16 or 17, wherein the trigger unit is configured to trigger the terminal to return to the first network based on the first indication information; wherein the first indication information is included in the In the first bearer or data stream establishment/modification request message.
19. The apparatus according to claim 18, wherein the first indication information includes at least one of the following:

    Fallback indication information corresponding to a specific service, the identification of the first network, the identification of the second network, the identification of initiating the establishment of the first bearer or data flow for the specific service, and a target time value, the target time value is used to determine The moment when the terminal is triggered to return to the first network.
20. The apparatus according to claim 19, wherein the specific service includes at least a voice or video service.
21. The apparatus according to claim 16 or 17, wherein the triggering unit is configured to trigger when the first bearer or data stream establishment/modification request message is received within a first time duration after the terminal access The terminal returns to the first network.
22. The device according to any one of claims 16 to 21, wherein the trigger unit is configured to initiate a handover or redirection process to the terminal, and trigger the terminal to return to the first terminal through the handover or redirection One network.
23. The apparatus according to claim 22, wherein the trigger unit is configured to send an RRC release message to the terminal to release the RRC connection, so that the terminal reselects to the cell of the first network.
24. The apparatus according to any one of claims 16 to 23, wherein the access of the terminal from the first network to the second network includes:

    The terminal accesses the second network from the first network through handover or redirection.
25. The method according to any one of claims 16 to 24, wherein, in the case of EPS fallback, the core network corresponding to the first network and the second network are different, and the access network is different.
26. The method according to any one of claims 16 to 24, wherein in the case of a RAT fallback, the core network corresponding to the first network and the second network are the same, and the access networks are different.
27. The device according to any one of claims 16 to 25, wherein, in the case of EPS fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is SMF and PGW-C Jointly set up network elements.
28. The apparatus according to any one of claims 16 to 24, 26, wherein, in the case of a RAT fallback, the first core network element that triggers the first bearer or data flow establishment/modification request message is AMF.
29. A network communication device, the device includes:

    A receiving unit, configured to receive a first bearer or data stream establishment/modification request message sent by a core network element;

    A determining unit, configured to, if the first bearer or data flow establishment/modification request message carries first indication information, determine the access target network and/or the time and time of accessing the target network according to the first indication information /Or access to the target network.
30. The apparatus according to claim 29, wherein the first indication information includes at least one of the following:

    The identifier of the original network, the identifier of the target network, the identifier for initiating the establishment of a second bearer or data flow for a specific service, and second time information, where the second time information is used to determine the time to access the target network and the access target The conditions of the network.
31. A network device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and executes any one of claims 1 to 13 Method, or the method of any one of claims 14 to 15.
32. A chip, including: a processor, for calling and running a computer program from a memory, so that a device installed with the chip performs the method according to any one of claims 1 to 13, or claims 14 to 15 The method as described in any one.
33. A computer-readable storage medium for storing a computer program that causes a computer to perform the method according to any one of claims 1 to 13, or the method according to any one of claims 14 to 15. .
34. A computer program product comprising computer program instructions which causes a computer to perform the method according to any one of claims 1 to 13, or the method according to any one of claims 14 to 15.
35. A computer program that causes a computer to execute the method according to any one of claims 1 to 13, or the method according to any one of claims 14 to 15.

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