CN112425250B

CN112425250B - Session establishment method, terminal device and network device

Info

Publication number: CN112425250B
Application number: CN201980046972.5A
Authority: CN
Inventors: 刘建华; 卢前溪; 杨宁
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2023-03-14
Anticipated expiration: 2039-01-21
Also published as: WO2020150876A1; CN112425250A

Abstract

The embodiment of the application provides a session establishing method, terminal equipment and network equipment, which can introduce a session management process on a sidelink direct connection interface to control data transmission on a sidelink. The session establishment method comprises the following steps: the method comprises the steps that first information is sent to network equipment by first terminal equipment, the first information is used for requesting to establish first session connection aiming at the first terminal equipment or at least one terminal equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface.

Description

Session establishing method, terminal equipment and network equipment

Technical Field

The embodiments of the present application relate to the field of communications, and in particular, to a session establishment method, a terminal device, and a network device.

Background

With the continuous development of the New air interface (5-Generation New Radio,5 GNR) application of the fifth Generation mobile communication technology, there are very high requirements on service quality such as rate, delay, packet loss rate, high-speed encoding and decoding, and the like. For example: for VR games, 10Gbps rate is required to be achieved, and the packet loss rate cannot exceed 10E-4. In cellular network communication, a session connection is established between a terminal device and an external network for controlling data transmission, and the transmission method cannot meet the requirements of 5G NR service on rate, time delay, packet loss rate, high-speed coding and decoding and the like. Therefore, how to establish a Session (Session) that meets the requirements of the 5G NR service is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides a session establishment method, terminal equipment and network equipment, which can introduce a session management process on a sideline direct connection interface to control data transmission on a sideline link (sidelink).

In a first aspect, a session establishment method is provided, where the method includes:

the method comprises the steps that first information is sent to network equipment by first terminal equipment, the first information is used for requesting to establish a first session connection aiming at the first terminal equipment or at least one terminal equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface.

In a second aspect, a session establishment method is provided, where the method includes:

the method comprises the steps that network equipment receives first information sent by first terminal equipment, wherein the first information is used for requesting to establish first session connection aiming at the first terminal equipment or at least one terminal equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface.

In a third aspect, a session establishment method is provided, where the method includes:

the second terminal device sends third information to the first terminal device or the network device, wherein the third information is used for requesting to establish a first session, the first session is specific to first service information, and the first session is at least applied to a sideline direct connection interface.

In a fourth aspect, a terminal device is provided, configured to perform the method in the first aspect or each implementation manner thereof.

Specifically, the terminal device includes a functional module for executing the first terminal device in the method in the first aspect or its implementation manners.

In a fifth aspect, a network device is provided, configured to perform the method in the second aspect or each implementation manner thereof.

In particular, the network device comprises functional modules for performing the methods of the second aspect or its implementations described above.

In a sixth aspect, a terminal device is provided, configured to perform the method in the third aspect or each implementation manner thereof.

Specifically, the terminal device includes a functional module configured to execute the second terminal device in the method in the first aspect or its implementation manner.

In a seventh aspect, a terminal device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method in the first aspect or each implementation manner thereof.

In an eighth aspect, a network device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method of the second aspect or each implementation mode thereof.

In a ninth aspect, a terminal device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method in the third aspect or each implementation manner thereof.

A tenth aspect provides a chip for implementing the method of any one of the first to third aspects or implementations thereof.

Specifically, the chip includes: a processor configured to call and run the computer program from the memory, so that the device on which the chip is installed performs the method according to any one of the first to third aspects or the implementation manners thereof.

In an eleventh aspect, a computer-readable storage medium is provided for storing a computer program, which causes a computer to perform the method of any one of the first to third aspects or implementations thereof.

In a twelfth aspect, there is provided a computer program product comprising computer program instructions for causing a computer to perform the method of any one of the first to third aspects or implementations thereof.

In a thirteenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any one of the above first to third aspects or implementations thereof.

By the technical scheme, a session management process can be introduced on the sidelink interface to control data transmission on the sidelink, and the sideline network and the cellular network can keep the same session management process to realize seamless switching of services on the sideline network and the cellular network.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of session establishment according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a session establishment method according to an embodiment of the present application.

Fig. 4 is a schematic flow chart diagram of session establishment provided according to an embodiment of the present application.

Fig. 5 is a schematic flow chart of session establishment provided according to another embodiment of the present application.

Fig. 6 is a schematic flow chart diagram of session establishment provided in accordance with yet another embodiment of the present application.

Fig. 7 is a schematic diagram of NCIS session request information provided according to an embodiment of the present application.

Fig. 8 is a schematic diagram of another NCIS session request information provided according to an embodiment of the present application.

Fig. 9 is a schematic diagram of still another NCIS session request information provided according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a terminal device provided according to an embodiment of the present application.

Fig. 11 is a schematic block diagram of a network device provided in an embodiment of the present application.

Fig. 12 is a schematic block diagram of another terminal device provided according to an embodiment of the present application.

Fig. 13 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of a chip provided according to an embodiment of the present application.

Fig. 15 is a schematic block diagram of a communication system provided according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The embodiment of the application can be applied to various communication systems, such as: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an Advanced Long Term Evolution (LTE-a) System, a New Radio (NR) System, an Evolution System of an NR System, an LTE (LTE-based Access to unlicensed spectrum, LTE-U) System on unlicensed spectrum, an NR (NR-based Access to unlicensed spectrum, a Universal Mobile telecommunications System (GSM) System, a UMTS (Universal Mobile telecommunications System), a Wireless Local Area Network (WLAN) System, and other Wireless communication systems.

Generally, the conventional Communication system supports a limited number of connections and is easy to implement, however, with the development of Communication technology, the mobile Communication system will support not only conventional Communication but also, for example, device-to-Device (D2D) Communication, machine-to-Machine (M2M) Communication, machine Type Communication (MTC), and Vehicle-to-Vehicle (V2V) Communication, and the embodiments of the present application can also be applied to these Communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a Carrier Aggregation (CA) scenario, may also be applied to a Dual Connectivity (DC) scenario, and may also be applied to an independent (SA) networking scenario.

The application spectrum is not limited in the embodiments of the present application. For example, the embodiments of the present application may be applied to a licensed spectrum and may also be applied to an unlicensed spectrum.

Illustratively, a 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 device 120 (or referred to as a communication terminal, terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

The embodiments of the present application are described in conjunction with a terminal device and a network device, where: a terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment, etc. The terminal device may be a Station (ST) in a WLAN, and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, and a next generation communication system, for example, a terminal device in an NR Network or a terminal device in a future evolved Public Land Mobile Network (PLMN) Network, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be matched with other equipment such as a smart phone for use, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

The network device may be a device for communicating with a mobile device, and the network device may be an Access Point (AP) in a WLAN, a Base Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB, eNodeB) in LTE, a relay Station or an Access Point, or a vehicle-mounted device, a wearable device, a network device (gNB) in an NR network, or a network device in a PLMN network that is evolved in the future.

In this embodiment, a network device provides a service for a cell, and a terminal device communicates with the network device through a transmission resource (for example, a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a Small cell (Small cell), where the Small cell may include: urban cells (Metro cells), micro cells (Micro cells), pico cells (Pico cells), femto cells (Femto cells), and the like, and the small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-rate data transmission services.

It should be understood that in a cellular network, a session connection is established between a terminal device and an external network for controlling data transmission, and specifically, as shown in fig. 2, the session establishment process includes the following steps:

step 1, UE initiates a Protocol Data Unit (PDU) session establishment request to an Access and Mobility Management Function (AMF);

step 2, AMF selects Session Management Function (SMF);

step 3, the AMF sends a PDU conversation establishment request to the selected SMF;

step 4, establishing registration (registration) or subscription retrieval (subscription retrieval) or subscription update (subscription for updates) for the session to be established between the SMF and a Unified Data Management (UDM);

step 5, SMF sends response message for PDU conversation establishment request to AMF;

step 6, PDU conversation authentication or authorization;

specifically, PDU session authentication or authorization may be implemented between the UE and a Data Network (DN).

Step 7a, SMF selection Policy Control Function (PCF);

step 7b, SMF establishing a session management policy association with the selected PCF or SMF triggering a session management policy association modification;

step 8, SMF selects user plane Function (Userplane Function, UPF);

step 9, triggering session management strategy relation modification between the SMF and the selected PCF;

step 10a, the smf transmits a session establishment or modification request to the UPF;

step 10b, the UPF sends a session establishment or modification response to the SMF;

step 11, exchanging N1N2 information between SMF and AMF;

step 12, the AMF sends a session establishment request to Access Network equipment (Radio Access Network, RAN or R (AN));

step 13, exchanging PDU conversation establishment receiving information between R (AN) and UE;

step 14, R (AN) sends PDU conversation request feedback to AMF, optionally UE sends first uplink data to UPF;

step 15, the AMF sends a PDU session update request to the SMF;

step 16a, the smf sends a session modification request to the UPF, optionally, the UPF sends the first downlink data to the UE;

step 1694, the upf sends a session modification response to the SMF;

step 17, the SMF sends a PDU session update response to the AMF;

step 18, smf sends session management status notification to AMF (optional);

step 19, the SMF configures an IPv6 address for the UE through the UPF;

step 20, unsubscribe or deregistration of the session (optional) is achieved between the smf and the UDM.

It should be noted that, as shown in fig. 2, the session establishment process between the terminal device and the external network cannot meet the requirements of the 5G application on service quality such as rate, delay, packet loss rate, high-speed coding and decoding, and the like. For example: for Virtual Reality (VR) games, the rate of 10Gbps needs to be reached, and the packet loss rate can not exceed 10E-4. Meanwhile, in order to meet the requirements of applications such as Augmented Reality (AR)/VR, games, and the like, a new service is provided, for example, a service may be referred to as a Network Controlled Interactive Services (NCIS) service, and of course, the new service may also be referred to by other specific names, which is not limited in this application.

This new service is described as an example of the NCIS service.

The NCIS service mainly aims at applications such as AR/VR and games, and has high requirements on service quality such as speed, time delay, packet loss rate and high-speed coding and decoding. The session established for the NCIS service is an NCIS session, and UEs in the same NCIS session can be considered to form an NCIS group. UEs joining an NCIS session may communicate locally, e.g., using a terminal-to-terminal (D2D) technique to establish a sidelink direct interface (also referred to as a PC5 interface), or may communicate remotely, e.g., using a UE-network-server-peer network-peer UE (also referred to as using a Uu interface or a cellular interface). The terminal devices joining the NCIS session may be from the same Public Land Mobile Network (PLMN) or from different PLMNs. For example, there are 5 UEs in an NCIS group, where 3 are UEs of PLMN 1, 2 are UEs of PLMN 2, and the 3 UEs of PLMN 1 use sidelink (sidelink) to communicate directly with each other, and simultaneously communicate with the 2 UEs of PLMN 2 using the network.

In a general cellular network communication, a session connection is established between a terminal and an external network for controlling data transmission, as shown in fig. 2, however, in a direct communication process between the terminal and the terminal, a session management process does not exist at present, and the NCIS service requirement cannot be met.

Based on the above technical problem, in the embodiment of the present application, a session management procedure is introduced on a sideline interface (PC 5 interface) to control the transmission of data on the sidelink, and the same session management procedure is maintained with the cellular network, so as to implement seamless service switching between the sidelink and the cellular network.

Fig. 3 is a schematic flow chart of a session establishment method 200 according to an embodiment of the present application, and as shown in fig. 3, the method 200 may include the following:

s210, a second terminal device sends third information to a first terminal device or a network device, wherein the third information is used for requesting to establish a first session, the first session is specific to first service information, and the first session is at least applied to a sideline direct connection interface;

s220, a first terminal device or a network device receives third information, wherein the third information is used for requesting to establish a first session, the first session is specific to first service information, and the first session is at least applied to a sideline direct connection interface;

s230, a first terminal device sends first information to a network device, where the first information is used to request establishment of a first session connection for the first terminal device or at least one terminal device, where the first session is for first service information, and the first session is at least applied to a sidelink direct connection interface;

s240, the network device receives first information sent by a first terminal device, where the first information is used to request to establish a first session connection for the first terminal device or at least one terminal device, where the first session is for first service information, and the first session is at least applied to a sideline direct connection interface.

In this embodiment, the network device may be a core network device, such as an SMF network element.

It should be noted that, in this embodiment of the application, S210 and S220 are optional, that is, when the first terminal device does not receive the third information, S230 may also be directly executed. The at least one terminal device may include a second terminal device.

In this embodiment, terminal devices in the same session for the first service belong to a group, the first service may be NCIS service, and the first session may be NCIS session.

The first terminal device and the second terminal device belong to the same Group, and specifically, the first terminal device may be a Group Header in the Group, may initiate NCIS session establishment to the network device instead of other terminal devices in the Group, may request, from the network device, a wireless resource that may be used by all terminal devices in the Group, and may serve as a medium or relay for communication between the terminal devices in the Group and the network device. The second terminal device may be a common member terminal within the group. The group here may refer to a group to which the first session corresponds.

Alternatively, the first terminal device may be granted the right to establish a session for the other terminal in a subscription (pre-configuration or agreement) manner or in an application layer indication manner or in a network configuration manner.

Optionally, the second terminal device learns that the first terminal device can establish a session connection (for example, an NCIS session connection) for the second terminal device, and the specific learning manner may be: the first terminal device notifies other terminals in the Group that the terminals have the capability of establishing a session for the terminals in the Group, or the second terminal device learns that the first terminal device can establish a session connection for the terminals according to information configured by the application layer or the network device, for example, the second terminal device obtains UE or Group Header UE whose information is a specific identifier.

Optionally, in this embodiment of the present application, the first service information includes at least one of the following information:

the first service comprises group Information related to the first service, external Network server Information (DNN), single-Network Slice Selection Assistance Information (S-NSSAI) Information, combination Information of the external Network server Information and the S-NSSAI, and session type Information.

In S210, the second terminal device may select whether to establish the NCIS session connection through the first terminal device or directly with the network device based on the following manners:

1) Based on the implementation manner of the second terminal device, for example, the second terminal device autonomously determines whether to establish the NCIS session connection through the first terminal device or directly establish the NCIS session connection with the network device;

2) The network device indicates to the second terminal device based on the network device indication mode, for example, when the second terminal device is registered;

3) The second terminal device determines the link state based on the Uu interface and/or the PC5 interface, and the specific method is as follows: if the link quality of the Uu interface of the second terminal equipment is lower than a pre-configured threshold, or the second terminal equipment cannot reside in a cell at the Uu interface, or the second terminal equipment cannot register in an available network, the second terminal equipment selects a mode of establishing an NCIS session connection through the first terminal equipment; and vice versa.

Optionally, in S210, the third information is used to request to establish the first session connection for the second terminal device, and the third information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

The service type information is NCIS service, for example.

The interface information of the first session application, for example, the sidelink interface (PC 5 interface) or the sidelink interface is adapted simultaneously with the cellular interface (PC 5 interface + Uu interface).

The group information corresponding to the first session, such as group identification information, group-related DNN and/or S-NSSAI information, etc.

It should be noted that the third information may be interpreted by the first terminal device or transmitted transparently to the first terminal device.

Optionally, in S220, after receiving the third information, the network device may establish a first session based on the third information, and allocate Internet Protocol (IP) address information for the first session, where the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, in S220, after the first terminal device receives the third information, if the third information can be interpreted by the first terminal device, the first terminal device needs to encapsulate the third information, send the encapsulated third information to a protocol message unit that is peer to peer with the network device and send the encapsulated third information to a corresponding network entity (SMF network element), and in addition, carry information of the second terminal device (for example, identification information of the second terminal device, subscription Permanent Identifier (SUPI), 5G global Unique Identifier Temporary terminal Identifier (5G global Unique Identifier UE Identity, 5G-GUTI), 5G Temporary Mobile user identification code (SAE-temporal Mobile Subscriber Identity, S-TSMI)), group information corresponding to the first session, and the like. If the third information is transparently transmitted to the first terminal device, the first terminal device sends the third information to a corresponding network entity, such as an SMF entity, and carries the information of the second terminal device and group information corresponding to the NCIS session.

Alternatively, the first terminal device may also initiate a request for establishing a session connection for other group members, specifically,

the first terminal device may determine whether to establish a session connection for other terminals in the group based on at least one of:

1) The method comprises the steps that a service is initially established, and first terminal equipment can detect member terminals in a group on a PC5 interface, or UE is connected with the member terminals on the PC5 interface;

2) Based on the manner of the network device indication, further, the network device may indicate to which member terminals the first terminal device may establish the session connection, for example, the network device indicates to the first terminal device when registering or indicates to the first terminal device when establishing;

3) Based on the indication of the application layer, further indication is needed for which terminals session connections need to be established.

That is, the first terminal device may perform S230 without based on S210. That is, the first terminal device may actively trigger the establishment of the first session connection for the second terminal device.

Optionally, the first terminal device actively triggers establishment of the first session connection for the second terminal device. Specifically, the first terminal device sends first information to the network device, where the first information is used to request to establish a first session connection for the second terminal device. The first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, and the group information corresponding to the first session.

Optionally, as an embodiment 1, in this embodiment 1, the first information is used to request to establish the first session connection for the first terminal device, that is, only the foregoing S230 and S240 are performed.

In this embodiment 1, the first information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

Optionally, in embodiment 1, the first terminal device receives second information sent by the network device, where the second information is used to respond to the first session connection establishment request for the first terminal device, and the second information includes IP address information allocated for the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, in embodiment 1, if the first session is for multicast or multicast data, the second information further includes a multicast or multicast address. The first terminal equipment adopts the multicast address as a target address of multicast transmission; this address may be adapted for a group data transfer of the PC5 interface or simultaneously for a group data transfer of the Uu interface. The multicast address assigned to each member terminal by the network device is the same for session establishment requests initiated by a plurality of members within the group.

Optionally, in embodiment 1, if the interface of the first session application includes a PC5 interface, the second information further includes QoS parameters adapted to the PC5 interface. If the interface of the first session application includes the PC5 interface and the Uu interface, the second information further includes QoS parameters adapted to the PC5 interface and QoS parameters adapted to the Uu interface, and the QoS parameters adapted to the PC5 interface are the same as or different from the QoS parameters adapted to the Uu interface.

Optionally, in embodiment 1, the first session is further applied to a cellular interface, the network device sends first request information to an access network device serving the first terminal device, where the first request information is used to request to establish the first session connection, and the first request information includes QoS parameters adapted to the cellular interface.

Optionally, in embodiment 1, the network device obtains subscription information for the first terminal device, verifies, according to the subscription information, whether the first terminal device belongs to a group corresponding to the first session, and verifies whether the first terminal device allows initiating a connection establishment request of the first session; and after the verification is successful, the network equipment sends the second information to the first terminal equipment.

Optionally, in embodiment 1, after receiving the IP address information, the first terminal device needs to notify in the group member and bind the user name of the group member, for example, the user identifier of the application layer.

The specific binding and notification methods are as follows:

mode 1: the first terminal device informs other members in the group of the application layer identification and the IP address and their binding relationship through a message of the PC5 interface, which may be, for example: application layer messages, PC5 signaling messages, PC5 discovery messages, etc.

Mode 2: the first terminal device informs other members in the group of the application layer identification, the IP address and the binding relationship thereof through the application layer service, and informs that the address and the binding relationship are suitable for a PC5 interface or a Uu interface.

Optionally, as an embodiment 2, in the embodiment 2, the at least one terminal device includes a second terminal device, and the first information is used to request to establish the first session connection for the second terminal device. That is, in S210, the second terminal device sends third information to the first terminal device, where the third information is used to request to establish a first session, where the first session is for the first service information, and the first session is at least applied to the sideline direct connection interface; and in S220, the first terminal device receives the third information.

In embodiment 2, if the third information can be interpreted by the first terminal device, the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, and the group information corresponding to the first session. If the third information is transmitted transparently to the first terminal device, the first information includes the third information and information of the second terminal device.

Optionally, in embodiment 2, the first terminal device receives second information sent by the network device, and sends the second information to the second terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device, and the second information includes IP address information allocated for the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, in embodiment 2, if the first session is for multicast or multicast data, the second information further includes a multicast or multicast address. The second terminal device adopts the multicast or multicast address as a target address of multicast or multicast transmission; this address may be adapted for group data transfer over the PC5 interface or simultaneously for group data transfer over the Uu interface. The multicast address assigned to each member terminal by the network device is the same for session establishment requests initiated by a plurality of members within the group.

Optionally, in embodiment 2, if the interface of the first session application includes a PC5 interface, the second information further includes QoS parameters adapted to the PC5 interface. If the interface of the first session application includes the PC5 interface and the Uu interface, the second information further includes QoS parameters adapted to the PC5 interface and QoS parameters adapted to the Uu interface, and the QoS parameters adapted to the PC5 interface are the same as or different from the QoS parameters adapted to the Uu interface.

Optionally, in embodiment 2, the first session also applies to a cellular interface, the network device sends first request information to an access network device serving the second terminal device, the first request information is used for requesting to establish the first session connection, and the first request information includes QoS parameters adapted to the cellular interface.

Optionally, in embodiment 2, the network device obtains first subscription information for the first terminal device and second subscription information for the second terminal device; the network device verifies whether the first terminal device meets a first condition and verifies whether the second terminal device meets a second condition according to the first subscription information, wherein the first condition comprises at least one of the following conditions: the second terminal device is authorized to establish the first session, and the second condition includes at least one of the following conditions: belonging to the group corresponding to the first session, and allowing to initiate a connection establishment request of the first session; after the authentication is successful, the network device sends the second information to the first terminal device.

Optionally, in embodiment 2, the network device obtains policy information corresponding to the first session, and allocates QoS parameters of an interface adapted to the first session application according to the policy information and a local policy.

Optionally, in embodiment 2, after receiving the IP address information, the second terminal device needs to notify in the group member and bind the user name of the group member, for example, the user identifier of the application layer.

The specific binding and notification methods are as follows:

mode 1: the second terminal device informs other members in the group of the application layer identification and the IP address and their binding relationship through a message of the PC5 interface, which may be, for example: application layer messages, PC5 signaling messages, PC5 discovery messages, etc.

Mode 2: the second terminal device informs other members in the group of the application layer identification, the IP address and the binding relationship thereof through the application layer service, and informs that the address and the binding relationship are suitable for the PC5 interface or the Uu interface.

Optionally, as an embodiment 3, in the embodiment 3, the at least one terminal device includes a second terminal device and a third terminal device, and the first information is used to request to establish the first session connection for the second terminal device and the third terminal device.

In embodiment 3, the first terminal device receives the fourth information transmitted by the second terminal device, and receives the fifth information transmitted by the third terminal device, wherein,

the fourth information is used for requesting to establish the first session connection for the second terminal device, and the fourth information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session;

the fifth information is used for requesting to establish the first session connection for the third terminal device, and the fifth information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

Optionally, if the fourth information is the same as the fifth information, the first information includes: the information of the second terminal device, the information of the third terminal device, and the same information of the fourth information and the fifth information.

Optionally, if the fourth information is the same as the fifth information, the first information includes: the information of the second terminal device, the information of the third terminal device, the information different from the fifth information in the fourth information, and the same information in the fourth information and the fifth information.

Optionally, if the fourth information is different from the fifth information, the first information includes: the fourth information, the fifth information, the information of the second terminal device, and the information of the third terminal device.

Optionally, in embodiment 3, the first terminal device triggers to establish the first session connection for the second terminal device and the third terminal device. The first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, the information of the third terminal device, and the group information corresponding to the first session.

Optionally, in embodiment 3, the first terminal device receives second information sent by the network device, and sends the second information to the second terminal device and the third terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device and the third terminal device, and the second information includes first IP address information and second IP address information, the first IP address information is IP address information allocated to the first session requested to be established for the second terminal device, the second IP address information is IP address information allocated to the first session requested to be established for the third terminal device, the first IP address information is suitable for data transmission on an interface of the first session application requested to be established by the second terminal device, and the second IP address information is suitable for data transmission on an interface of the first session application requested to be established by the third terminal device.

Optionally, in embodiment 3, if the first session is for multicast or multicast data, the second information further includes a multicast or multicast address. The second terminal device adopts the multicast address as a target address of multicast transmission; this address may be adapted for a group data transfer of the PC5 interface or simultaneously for a group data transfer of the Uu interface. The multicast address assigned to each member terminal by the network device is the same for session establishment requests initiated by a plurality of members in the group.

Optionally, in embodiment 3, if the interface of the first session application comprises a PC5 interface, the second information further comprises QoS parameters adapted to the PC5 interface. If the interface of the first session application includes the PC5 interface and the Uu interface, the second information further includes QoS parameters adapted to the PC5 interface and QoS parameters adapted to the Uu interface, and the QoS parameters adapted to the PC5 interface are the same as or different from the QoS parameters adapted to the Uu interface.

Optionally, in embodiment 3, the first session is further applied to a cellular interface, the network device sends second request information to access network devices serving the second terminal device and the third terminal device respectively, the second request information is used for requesting to establish the first session connection, and the second request information includes QoS parameters adapted to the cellular interface.

Optionally, in embodiment 3, the network device obtains subscription information for the first terminal device, and verifies whether the first terminal device satisfies a third condition according to the subscription information, where the third condition includes at least one of: the second terminal device and the third terminal device are authorized to establish the first session; after the authentication is successful, the network device sends the second information to the first terminal device.

Optionally, in embodiment 3, the network device obtains policy information corresponding to the first session, and allocates QoS parameters of an interface adapted to the first session according to the policy information and a local policy.

Therefore, in the embodiment of the present application, a session management procedure may be introduced on the sidelink interface to control data transmission on the sidelink, and the sidelink network and the cellular network may maintain the same session management procedure to implement seamless handover of traffic on the sidelink network and the cellular network.

The session establishment method provided in the embodiments of the present application is described in detail below with reference to specific embodiments.

Optionally, as a first embodiment, a process in which a Group member terminal device (UE) separately establishes an NCIS session, in the first embodiment, the UE may be a first terminal device or a second terminal device in the session establishment method 200 shown in fig. 3, that is, the UE may be an ordinary member terminal in a Group, or may be a control terminal (Group Header UE) in the Group. It should be noted that the control terminal device (Group Header UE) may initiate NCIS PC5 session establishment to the network device instead of other terminal devices in the Group, may request, from the network device, a wireless resource that can be used by all terminal devices in the Group, and may serve as a medium or relay for communication between the terminal devices in the Group and the network device. It should be understood that terminal devices under the same session for the NCIS service belong to one group.

Specifically, as shown in fig. 4, in the first embodiment, the session establishment method 300 includes steps 301 to 308.

And 301, the UE sends an NCIS session establishment request to the AMF network element.

Optionally, the NCIS session is for NCIS traffic information, and the NCIS session applies at least to the sideline-direct interface. The NCIS service information comprises at least one of the following information: the NCIS service related group information, external network server information (DNN), S-NSSAI information, combination information of the external network server information (DNN) and the S-NSSAI, and session type information.

Specifically, the NCIS session establishment request may carry at least one of the following information:

identification information of the NCIS session connection;

service type information, such as NCIS service;

interface information of the NCIS session application, such as the sideline direct interface (PC 5 interface) or the sideline direct interface adapting to the cellular interface (PC 5 interface + Uu interface) at the same time;

the NCIS session includes group information corresponding to the NCIS session, such as group identification information, group-related DNN and/or S-NSSAI information, and the like.

It should be noted that the group corresponding to the NCIS session may be: the group in which the UE is located after the NCIS session establishment requested to be established by the UE.

The AMF network element selects an SMF network element.

After receiving the session connection establishment request message initiated by the UE, the AMF network element selects the SMF network element according to the group information corresponding to the NCIS session, the capability of the SMF network element for supporting the NCIS session and the like.

Optionally, the capability supported by the SMF network element for the NCIS session may be preconfigured, or may be configured by the network device, or may be indicated by the application layer.

And 303. The AMF network element forwards the NCIS session establishment request to the SMF network element.

It should be understood that the SMF network element in step 303 is the SMF network element selected by the AMF network element.

The smf network element obtains subscription information from a UDM network element or a Unified Data Repository function (UDR) network element or a PCF network element.

Specifically, the SMF network element acquires subscription information or authorization information for the UE from the UDM network element or the UDR network element or the PCF network element, for example, whether the UE belongs to a group corresponding to the NCIS session, whether the UE allows initiating NCIS session establishment, or the like. And if the SMF network element successfully verifies the subscription information aiming at the UE, processing the NCIS session request of the UE, otherwise rejecting the NCIS session request of the UE, namely stopping the step of establishing the subsequent NCIS session.

And 305. The SMF network element acquires the strategy information from the PCF network element.

Specifically, the SMF network element acquires policy (policy) information corresponding to the NCIS session from the UDM network element or the UDR network element or the PCF network element, and generates a QoS requirement according to the local policy and the acquired policy information. And the interface information related to the NCIS session is carried in the message sent by the SMF network element to the UDM network element or the UDR network element or the PCF network element. The policy information fed back by the UDM or UDR or PCF network element may be interface specific for the NCIS session or the same or different for a common, e.g. PC5 interface and Uu interface. The QoS generated by the SMF network element may be specific to a particular interface or the same for all compliant interfaces of the NCIS.

The smf network element sends an NCIS session setup request to the RAN. (optionally)

It should be noted that, if the interface of the NCIS session application includes a PC5 interface and a Uu interface, the SMF network element sends an NCIS session establishment request to the RAN, where the NCIS session establishment request carries QoS information. Otherwise, after step 305, step 307 is performed.

The smf network element allocates IP address information for the NCIS session.

Specifically, the SMF network element allocates corresponding IP address information for the NCIS session, and this IP address information is adapted to data transmission on a corresponding interface of the NCIS session. The SMF network element may allocate respective IP address information to the PC5 interface and the Uu interface, or allocate the same IP address.

Optionally, the NCIS session is for multicast or multicast data transmission, and the SMF network element may allocate a multicast or multicast address to the UE, and the UE uses the multicast or multicast address as a destination address for multicast or multicast transmission; this multicast or multicast address may be adapted for group data transmission on the PC5 interface or simultaneously for group data transmission on the Uu interface. The multicast or multicast address assigned by the SMF network element to each member terminal is the same for session establishment requests initiated by a plurality of members within the group.

And 308, the SMF network element sends NCIS session establishment acceptance information to the UE.

Specifically, the NCIS session establishment acceptance information is used for responding to an NCIS session connection establishment request initiated by a UE, and the NCIS session establishment acceptance information includes IP address information allocated for an NCIS session, and the IP address information is suitable for transmitting data on an interface of an NCIS session application.

Optionally, in a first embodiment, if the NCIS session is for multicast or multicast data, the NCIS session establishment acceptance information further includes a multicast or multicast address.

Optionally, in the first embodiment, the interface of the NCIS session application includes a PC5 interface, and the NCIS session establishment acceptance information further includes a QoS parameter adapted to the PC5 interface.

Optionally, in the first embodiment, the interface of the NCIS session application includes a PC5 interface and a Uu interface, the NCIS session establishment acceptance information further includes a QoS parameter adapted to the PC5 interface and a QoS parameter adapted to the Uu interface, and the QoS parameter adapted to the PC5 interface is the same as or different from the QoS parameter adapted to the Uu interface.

Optionally, in the first embodiment, after receiving the IP address information, the UE needs to notify in the group member and bind the user name of the group member, for example, the user identifier of the application layer.

The specific binding and notification modes are as follows:

mode 1: the UE informs other members in the group of the application layer identity and the IP address and their binding relationship through the messages of the PC5 interface, which may be, for example: application layer messages, PC5 signaling messages, PC5 discovery messages, etc.

Mode 2: the UE informs other members in the group of the application layer identification, the IP address and the binding relationship thereof through the application layer service, and informs that the address and the binding relationship are suitable for a PC5 interface or a Uu interface.

Optionally, as a second embodiment, the Group member UE1 may be a first terminal device in the session establishment method 200 shown in fig. 3, and the UE1 may be a second terminal device in the session establishment method 200 shown in fig. 3, as a procedure for establishing an NCIS session through a Group Header UE in the Group in the second embodiment, that is, the UE1 is a common member terminal in the Group, and the UE is a Group Header in the Group. It should be noted that the Group Header UE may initiate NCIS PC5 session establishment to the network device instead of other terminal devices in the Group, may request, from the network device, a wireless resource that can be used by all terminal devices in the Group, and may serve as a medium or relay for communication between the terminal devices in the Group and the network device. It should be understood that terminal devices under the same session for NCIS service belong to one group.

Specifically, as shown in fig. 5, in the second embodiment, the session establishment method 400 includes steps 401 to 410.

In the second embodiment, the UE has the capability and right to establish a session for other member terminals in the group. The UE may be granted the right to establish a session for other terminals in a subscription (pre-configuration or agreement) manner or in an application layer indicated manner or in a network configuration manner.

In the second embodiment, UE1 learns that UE can establish session connection for it, and the specific learning manner may be: the UE notifies the UE1 of the capability of session establishment or the UE1 learns whether the UE can establish a session connection for the UE according to the information configured by the application or the network, for example, the UE1 obtains the information of the UE with the specific identifier or the Group Header UE.

UE1 sends an NCIS session setup request to the UE. (optionally)

Optionally, the NCIS session is for NCIS traffic information, and the NCIS session applies at least to the sideline-direct interface. The NCIS service information comprises at least one of the following information: the NCIS service related group information, external network server information (DNN), S-NSSAI information, combination information of the external network server information (DNN) and the S-NSSAI information and session type information.

Specifically, UE1 needs to establish an NCIS session, and UE1 sends an NCIS session establishment request to the UE to request the UE to establish an NCIS session for it.

Optionally, the NCIS session establishment request includes, but is not limited to, at least one of the following information:

identification information of the NCIS session to be established, such as the NCIS session ID;

group information corresponding to the NCIS session to be established, such as group identification information, DNN and/or S-NSSAI information related to the group, and the like;

service type information, such as NCIS service;

interface information of the NCIS session application, for example, the sidelink interface (PC 5 interface) or the sidelink interface is adapted to the cellular interface (PC 5 interface + Uu interface) at the same time.

It should be noted that the information included in the NCIS session establishment request may be interpreted by the UE or transmitted transparently to the UE.

UE1 may select whether to establish the NCIS session connection through the UE or directly with the network device based on:

1) Based on the implementation manner of the UE1, for example, the UE1 autonomously decides whether to establish the NCIS session connection through the UE or directly establish the NCIS session connection with the network device;

2) The network equipment indication mode is based on, for example, the network equipment indication is given to the UE1 when the UE1 is registered;

3) The UE1 determines the link state based on the Uu interface and/or the PC5 interface, and the specific mode is as follows: if the link quality of the Uu interface of the UE1 is lower than a preconfigured threshold, or the UE1 cannot reside in a cell in the Uu interface, or the UE1 cannot register to an available network, the UE1 selects a mode of establishing an NCIS session connection by adopting the UE; and vice versa.

UE sends an NCIS session setup request for UE1 to the AMF network element.

Specifically, the UE receives the NCIS session establishment request from UE1, and the UE transmits the NCIS session establishment request for UE1 to the network device. If the information that the UE needs to interpret is received in step 401, the UE needs to encapsulate the received information, send the encapsulated information to a protocol message unit that is peer to peer with the network device, and send the encapsulated information to a corresponding network entity (AMF network element), and in addition, carry information of UE1 (e.g., identification information of UE1, SUPI,5G-GUTI, 5G-S-TMSI), group information corresponding to the NCIS session, and the like. If the protocol message unit transparently transmitted to the UE is received in step 401, the UE sends the protocol message unit to a corresponding network entity, for example, an SMF network element entity. The protocol message unit carries the information of the UE1 and the group information corresponding to the NCIS session.

Alternatively, the UE may not initiate a session connection establishment request for other group members based on step 401, specifically,

the UE may determine whether to establish a session connection for other terminals in the group based on at least one of:

1) The service is initially established, and the UE can detect member terminals in the group on a PC5 interface, or the UE is connected with the member terminals on the PC5 interface;

2) Based on the manner indicated by the network device, the network device may further indicate to which member terminals the UE may establish the session connection, for example, the network device indicates to the UE at registration or indicates to the UE at group establishment;

And 403. Selecting the SMF network element by the AMF network element.

The AMF network element selects a corresponding SMF network element entity according to the group information corresponding to the NCIS session in the received NCIS session establishment request aiming at the UE1 and the capability of the SMF network element for supporting the NCIS session.

The AMF network element forwards an NCIS session establishment request for the UE1 to the SMF network element.

It should be appreciated that the SMF network element in step 404 is the SMF network element selected by the AMF network element.

Specifically, the AMF network element simultaneously sends group information corresponding to the NCIS session and identification information of the UE to the SMF network element.

And 405, the SMF network element acquires the subscription information from the UDM network element or the UDR network element or the PCF network element.

Specifically, the SMF network element obtains subscription information or authorization information for the UE from the UDM network element or the UDR network element or the PCF network element, for example, whether the UE belongs to a group corresponding to the NCIS session, whether the UE allows initiating NCIS session establishment, whether the UE authorizes establishment of session connection for the UE1, and the like. The SMF network element simultaneously acquires the subscription information or the authorization information of the UE1, verifies whether the UE1 belongs to a group corresponding to the NCIS session, whether the UE1 allows to initiate the NCIS session and the like. And if the SMF network element verifies that the subscription information aiming at the UE and the UE1 is successful, processing the NCIS session establishment request aiming at the UE1 initiated by the UE, and if not, rejecting the NCIS session establishment request aiming at the UE1 initiated by the UE.

And 406, the SMF network element acquires the policy information from the UDM network element or the UDR network element or the PCF network element.

Specifically, the SMF network element acquires policy (policy) information corresponding to the UE1NCIS session (the NCIS session for the UE 1) from the UDM network element or the UDR network element or the PCF network element, and generates a QoS requirement according to the local policy and the acquired policy information. And the SMF network element sends a message to the UDM network element or the UDR network element or the PCF network element, wherein the message carries interface information related to the UE1NCIS session. The policy information fed back by the UDM or UDR or PCF network element may be interface specific for the UE1NCIS session or the same or different for a common, e.g. the policy of the PC5 interface and the policy of the Uu interface. The QoS generated by the SMF network element may be specific to a particular interface or the same for all compliant interfaces of the NCIS.

The smf network element sends an NCIS session setup request to the RAN.

It should be noted that, if the interface of the UE1NCIS session application includes a PC5 interface and a Uu interface, the SMF Network element sends a UE1NCIS session establishment request to a Radio Access Network (RAN) serving the UE1, where the UE1NCIS session establishment request carries QoS information. Otherwise, after step 406, step 408 is performed.

If UE1 is in idle state, the RAN serving UE1 may trigger UE1 to enter connected state through a paging procedure.

The smf network element allocates IP address information for the NCIS session.

Specifically, the SMF network element allocates corresponding IP address information for the UE1NCIS session, and the IP address information is adapted to data transmission on a corresponding interface of the UE1NCIS session. The SMF network element may allocate respective IP address information for the PC5 interface and the Uu interface, or may allocate the same IP address.

Optionally, the UE1NCIS session is for multicast or multicast data transmission, and the SMF network element may allocate a multicast or multicast address to the UE1, and the UE1 uses the multicast or multicast address as a destination address for multicast or multicast transmission; this address may be adapted for a group data transfer of the PC5 interface or simultaneously for a group data transfer of the Uu interface. The multicast or multicast address allocated to each member terminal by the SMF network element is the same for session establishment requests initiated by a plurality of members within the group.

And 409. The SMF network element sends NCIS session establishment acceptance information to the UE.

Specifically, the NCIS session establishment acceptance information is used for responding to a UE-initiated NCIS session connection establishment request for the UE1, and the NCIS session establishment acceptance information includes IP address information allocated for the UE1NCIS session, and the IP address information is suitable for transmitting data on an interface of the UE1NCIS session application.

It should be noted that the content included in the NCIS session establishment acceptance information may be transmitted transparently to the UE or interpreted by the UE, and is matched with the method in step 401. And the NCIS session establishment acceptance information needs to explicitly carry the identification information of the UE1.

UE forwards NCIS session setup accept information to UE1. (optionally)

Optionally, the UE forwards the received session establishment accept message to UE1.

Optionally, in the second embodiment, if the NCIS session of the UE1 is for multicast or multicast data, the NCIS session establishment acceptance information further includes a multicast or multicast address.

Optionally, in the second embodiment, the interface of the UE1NCIS session application includes a PC5 interface, and the NCIS session establishment acceptance information further includes QoS parameters adapted to the PC5 interface.

Optionally, in the second embodiment, the interface of the UE1NCIS session application includes a PC5 interface and a Uu interface, the NCIS session establishment acceptance information further includes a QoS parameter adapted to the PC5 interface and a QoS parameter adapted to the Uu interface, and the QoS parameter adapted to the PC5 interface is the same as or different from the QoS parameter adapted to the Uu interface.

Optionally, in the second embodiment, after receiving the IP address information, the UE1 needs to notify in the group member and bind the user name of the group member, for example, the user identifier of the application layer.

The specific binding and notification modes are as follows:

mode 1: the UE1 informs other members in the group of the application layer identity and the IP address and their binding relationship through messages of the PC5 interface, which may be, for example: application layer messages, PC5 signaling messages, PC5 discovery messages, etc.

Mode 2: the UE1 informs other members in the group of the application layer identification, the IP address and the binding relationship thereof through the application layer service, and informs that the address and the binding relationship are suitable for a PC5 interface or a Uu interface.

Optionally, as a third embodiment, in the process that the Group members UE1 and UE2 establish the NCIS session through the Group Header UE in the Group, in the third embodiment, the UE may be a first terminal device in the session establishment method 200 shown in fig. 3, and UE1 or UE2 may be a second terminal device in the session establishment method 200 shown in fig. 3, that is, UE1 and UE2 are common member terminals in the Group, and UE is a Group Header in the Group. It should be noted that the Group Header UE may initiate NCIS PC5 session establishment to the network device instead of other terminal devices in the Group, may request, from the network device, a wireless resource that can be used by all the terminal devices in the Group, and may serve as a medium or relay for communication between the terminal devices in the Group and the network device. It should be understood that terminal devices under the same session for the NCIS service belong to one group.

Specifically, as shown in fig. 6, in the third embodiment, the session establishment method 500 includes steps 501 to 510.

In the third embodiment, the UE has the capability and right to establish a session for other member terminals in the group. The UE may be granted the right to establish a session for other terminals in a subscription (pre-configuration or agreement) manner or in an application layer indicated manner or in a network configuration manner.

In the third embodiment, UE1 and UE2 know that UE can establish session connection for them, and the specific learning manner may be: the UE notifies the UE1 and the UE2 of the capability of session establishment or the UE1 and the UE2 know whether the UE can establish session connection for the UE according to the information of application or network configuration, for example, the UE1 and the UE2 obtain the UE or the Group Header UE whose information is a specific identifier.

UE1 and UE2 send NCIS session setup requests to the UE. (optionally)

Specifically, UE1 or UE2 needs to establish an NCIS session, and UE1 or UE2 sends an NCIS session establishment request to the UE to request the UE to establish an NCIS session for it.

service type information, such as NCIS service;

interface information of the NCIS session application, such as the sidelink interface (PC 5 interface) or the sidelink interface is adapted simultaneously with the cellular interface (PC 5 interface + Uu interface).

UE1 or UE2 may select whether to establish the NCIS session connection through the UE or directly with the network device based on:

1) Based on the implementation manner of the UE1 or the UE2, for example, the UE1 or the UE2 autonomously decides whether to establish the NCIS session connection through the UE or directly establish the NCIS session connection with the network device;

2) The network equipment indicates the mode based on the network equipment, for example, the network equipment indicates the UE1 or the UE2 when the UE1 or the UE2 is registered;

3) The UE1 or UE2 determines the link status based on the Uu interface and/or the PC5 interface, and the specific manner is as follows: if the link quality of the Uu interface of the UE1 or the UE2 is lower than a preconfigured threshold, or the UE1 or the UE2 cannot reside in a cell in the Uu interface, or the UE1 or the UE2 cannot register to an available network, the UE1 or the UE2 selects a mode of establishing NCIS session connection by adopting the UE; and vice versa.

UE sends NCIS session setup request for UE1 and UE2 to AMF network element.

1) When the messages sent by the UE1 and the UE2 are interpretable messages for the UE, the UE determines whether NCIS session request information of the UE1 and the UE2 is the same, for example, whether group information corresponding to the NCIS session is the same, whether DNN is the same, whether S-NSSAI is the same, whether interfaces adapted to the NCIS session are the same, and whether session services are the same; UE generates a NCIS session establishment request for UE1 and UE2 and sends the NCIS session establishment request to network equipment, if cells (parameters) in NCIS session request information of UE1 and UE2 are completely the same, the NCIS session establishment request aiming at UE1 and UE2 carries identification information of UE1 and UE2 and cell information common to the UE1 and UE2; if the partial information is the same, the NCIS session establishment requests aiming at the UE1 and the UE2 carry a common cell for carrying the same information and respectively different cells of the UE1 and the UE2 carry different information. For example, as shown in fig. 7, the NCIS session setup request for UE1 and UE2 sent by the UE to the AMF network element may include UE identity (info), group identity (group info), common cell identity (common info), UE1 index (index), UE1 private cell identity (specific info), UE2 index, and UE2 specific info.

It should be noted that the AMF network element may select an SMF network element according to the group info, where the AMF network element needs to forward the UE info and the group info to the SMF network element, and at the same time, encapsulate the common info, the UE1 index, the UE1 specific info, the UE2 index, and the UE2 specific info in Session Management (SM) encapsulation information (container), where the SM container is transparently transmitted to the AMF network element and may be parsed by the SMF network element.

2) When the messages sent by the UE1 and the UE2 are messages transparently transmitted to the UE, the UE encapsulates different protocol message units of the UE1 and the UE2 in one message at the same time, sends the message to the network side, and gives a corresponding terminal identifier for each protocol message unit, and carries the identifier information of the group at the same time.

For example, as shown in fig. 8, the NCIS session establishment request for UE1 and UE2 sent by the UE to the AMF network element may include UE info, group info, UE1 index, UE1 SM container, UE2 index, and UE2 SM container.

It should be noted that the AMF network element may select the SMF network element according to the group info, where the AMF network element needs to forward the UE info, the group info, the UE1 index, and the UE2 index to the SMF network element, and meanwhile, the UE1 SM container and the UE2 SM container transparently transmit to the AMF network element and may be analyzed by the SMF network element.

Alternatively, the UE may not initiate a session connection establishment request for other group members based on step 501, specifically,

2) Based on the manner indicated by the network device, further, the network device may indicate to which member terminals the UE may establish session connection, for example, the network device indicates to the UE when the UE is registered or indicates to the UE when the UE is established;

3) Based on the indication of the application layer, further indication is made as to which terminals session connections need to be established.

If the UE actively triggers to establish the session connection for UE1 and UE2, the UE requests a common cell for UE1 and UE2, for example, as shown in fig. 9, the NCIS session establishment request for UE1 and UE2 sent by the UE to the AMF network element may include UE info, group info, common info, UE1 index, and UE2 index.

It should be noted that the AMF network element may select the SMF network element according to the group info, and the AMF network element needs to forward the UE info and the group info to the SMF network element, and at the same time, encapsulates the common info, the UE1 index, and the UE2 index in an SM container, where the SM container transparently transmits to the AMF network element and can be parsed by the SMF network element.

The amf network element selects an SMF network element.

The AMF network element selects a corresponding SMF network element entity according to the group information corresponding to the NCIS session in the received NCIS session establishment request aiming at the UE1 and the UE2 and the capability of the SMF network element for supporting the NCIS session.

The amf network element forwards the NCIS session setup request for UE1 and UE2 to the SMF network element.

And 505, the SMF network element acquires the subscription information from the UDM network element or the UDR network element or the PCF network element.

The SMF network element acquires subscription information or authorization information for the UE from the UDM network element or the UDR network element or the PCF network element, for example, whether the UE belongs to a group corresponding to the NCIS session, whether the UE allows initiating NCIS session establishment, whether the UE authorizes establishment of NCIS session connection for UE1 and UE2, and the like. And if the SMF network element verifies that the subscription information aiming at the UE is successful, processing the NCIS session establishment requests aiming at the UE1 and the UE2 initiated by the UE, and if not, rejecting the NCIS session establishment requests aiming at the UE1 and the UE2 initiated by the UE.

And 506, the SMF network element acquires the policy information from the UDM network element or the UDR network element or the PCF network element.

Specifically, the SMF network element entity obtains policy information corresponding to the UE1NCIS session (NCIS session for UE 1) and the UE2 NCIS session (NCIS session for UE 2) from the UDM network element or the UDR network element or the PCF network element, and generates QoS requirements according to the local policy and the obtained policy information. And the SMF network element sends a message to the UDM network element or the UDR network element or the PCF network element, wherein the message carries interface information related to the UE1NCIS session and the UE2 NCIS session. The policy information fed back by the UDM or UDR or PCF network element may be interface specific for the UE1NCIS session and UE2 NCIS session or common, e.g. the policy of the PC5 interface and the policy of the Uu interface are the same or different. The QoS generated by the SMF network element may be specific to a particular interface or the same for all compliant interfaces of the NCIS.

The smf network element sends an NCIS session setup request to the RAN.

It should be noted that, if the interfaces of the UE1NCIS session and UE2 NCIS session applications include a PC5 interface and a Uu interface, the SMF network element sends NCIS session establishment requests to the RANs serving UE1 and UE2, respectively, where the NCIS session establishment requests carry QoS information. If the UE1 and the UE2 are in the idle state, the UE is triggered to enter the connected state through a paging process.

The smf network element allocates IP address information for the NCIS session.

Specifically, the SMF network element allocates corresponding IP address information for the UE1NCIS session and the UE2 NCIS session, respectively, and the IP address information is adapted to data transmission on a corresponding interface of the NCIS session. The SMF network element may allocate respective IP address information for the PC5 interface and the Uu interface, or may allocate the same IP address.

Optionally, the UE1NCIS session is for multicast or multicast data transmission, and the SMF network element may allocate a multicast or multicast address to the UE1, and the UE1 uses the multicast or multicast address as a destination address for multicast or multicast transmission; this address may be adapted for a group data transfer of the PC5 interface or simultaneously for a group data transfer of the Uu interface.

Optionally, the UE2 NCIS session is for multicast or multicast data transmission, and the SMF network element may allocate a multicast or multicast address to the UE2, and the UE2 uses the multicast or multicast address as a destination address for the multicast or multicast transmission; this address may be adapted for group data transfer over the PC5 interface or simultaneously for group data transfer over the Uu interface.

For session establishment requests initiated by a plurality of members in the group, the multicast or multicast address allocated to each member terminal by the SMF network element is the same, i.e. the multicast or multicast addresses of UE1 and UE2 are the same.

And 509, the SMF network element sends NCIS session establishment acceptance information to the UE.

Specifically, the NCIS session establishment acceptance information is used for responding to a UE-initiated NCIS session connection establishment request for the UE1 and the UE2, and the NCIS session establishment acceptance information includes IP address information a allocated for the UE1NCIS session, the IP address information a being suitable for transmitting data on an interface of the UE1NCIS session application, and IP address information B allocated for the UE2 NCIS session, the IP address information B being suitable for transmitting data on an interface of the UE2 NCIS session application.

It should be noted that the content included in the NCIS session establishment acceptance information may be transmitted transparently to the UE or interpreted by the UE, and may be matched with the method in step 501. And the NCIS session establishment acceptance information needs to explicitly carry the identification information of UE1 and UE2.

UE forwards the NCIS session setup acceptance information to UE1 and UE2, respectively. (optionally)

Optionally, the UE forwards the received session establishment accept message to UE1 and UE2.

Optionally, in the third embodiment, if the UE1NCIS session and/or the UE2 NCIS session is for multicast or multicast data, the NCIS session establishment acceptance information further includes a multicast or multicast address.

Optionally, in the third embodiment, the interface of the UE1NCIS session and/or the UE2 NCIS session application includes a PC5 interface, and the NCIS session establishment acceptance information further includes a QoS parameter adapted to the PC5 interface.

Optionally, in the third embodiment, the interface of the UE1NCIS session and/or the UE2 NCIS session application includes a PC5 interface and a Uu interface, the NCIS session establishment acceptance information further includes a QoS parameter adapted to the PC5 interface and a QoS parameter adapted to the Uu interface, and the QoS parameter adapted to the PC5 interface is the same as or different from the QoS parameter adapted to the Uu interface.

Optionally, in the third embodiment, after receiving the IP address information, UE1 and/or UE2 need to notify in the group member and bind the user name of the group member, for example, the user identifier of the application layer.

The specific binding and notification methods are as follows:

mode 1: UE1 and/or UE2 inform other members in the group of the application layer identity and IP address and their binding relationship through messages of the PC5 interface, which may be, for example: application layer messages, PC5 signaling messages, PC5 discovery messages, etc.

Mode 2: and the UE1 and/or the UE2 informs other members in the group of the application layer identification, the IP address and the binding relationship thereof through application layer services, and informs that the address and the binding relationship are suitable for a PC5 interface or a Uu interface.

Fig. 10 shows a schematic block diagram of a terminal device 600 according to an embodiment of the application. The terminal device 600 is a first terminal device, and as shown in fig. 10, the terminal device includes:

the communication unit 610 is configured to send first information to a network device, where the first information is used to request establishment of a first session connection for the first terminal device or at least one terminal device, where the first session is for first service information, and the first session is at least applied to a sideline direct connection interface.

Optionally, the first service information includes at least one of the following information: the first service comprises group information related to the first service, external network server information, single network slicing auxiliary information S-NSSAI information, combined information of the external network server information and the S-NSSAI, and session type information.

Optionally, the terminal devices under the same session for the first service belong to a group, and the at least one terminal device and the first terminal device belong to the same group.

Optionally, the first information is used to request to establish the first session connection for the first terminal device, and the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

Optionally, the communication unit 610 is further configured to receive second information sent by the network device, where the second information is used to respond to the first session connection establishment request for the first terminal device, and the second information includes internet protocol IP address information allocated for the first session, and the IP address information is suitable for transmitting data on the interface of the first session application.

Optionally, the second information further comprises a multicast or multicast address adapted to transmit multicast or multicast data on the interface of the first session application.

Optionally, the first terminal device further includes:

a processing unit 620, configured to establish a binding relationship between the IP address information and the application layer identifier of the first terminal device;

the communication unit 610 is further configured to notify other terminal devices that belong to the same group as the first terminal device of the IP address information, the application layer identifier, and the binding relationship.

Optionally, the communication unit 610 is specifically configured to:

notifying other terminal devices belonging to the same group as the first terminal device of the IP address information, the application layer identification and the binding relation through a message on a sideline direct connection interface; or

And informing other terminal equipment which belongs to the same group with the first terminal equipment of the IP address information, the application layer identification and the binding relation through application layer service.

Optionally, the message on the sideline direct interface includes at least one of the following messages: application layer messages, sideline direct connection interface signaling messages, and sideline direct connection interface discovery messages.

Optionally, the binding relationship is applicable to an interface of the first session application.

Optionally, the second information further includes a quality of service QoS parameter adapted to the sidelink direct interface; or

The second information further includes QoS parameters adapted to the sidelink interface and QoS parameters adapted to the cellular interface, and the QoS parameters adapted to the sidelink interface are the same as or different from the QoS parameters adapted to the cellular interface.

Optionally, the at least one terminal device includes a second terminal device, and the first information is used to request to establish the first session connection for the second terminal device.

Optionally, the communication unit 610 is further configured to receive third information sent by the second terminal device, where the third information is used to request to establish the first session connection for the second terminal device, and the third information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

Optionally, the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, and the group information corresponding to the first session.

Optionally, the first information includes the third information and information of the second terminal device.

Optionally, the communication unit 610 is further configured to send first indication information to the second terminal device, where the first indication information is used to indicate that the first terminal device has the capability and right to establish the first session for other terminal devices.

Optionally, the terminal device 600 further includes:

a processing unit 620, configured to trigger establishment of the first session connection for the second terminal device.

Optionally, the communication unit 610 is further configured to receive second information sent by the network device and send the second information to the second terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device, and the second information includes IP address information allocated for the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, the second information further comprises a multicast or multicast address, the multicast or multicast address being suitable for transmitting multicast or multicast data on the interface of the first session application.

Optionally, the second information further includes QoS parameters adapted to the sidelink direct interface; or

Optionally, the at least one terminal device includes a second terminal device and a third terminal device, and the first information is used to request to establish the first session connection for the second terminal device and the third terminal device.

Optionally, the communication unit 610 is further configured to receive fourth information sent by the second terminal device, and receive fifth information sent by the third terminal device, wherein,

Optionally, the fourth information is the same as the fifth information, and the first information includes: the information of the second terminal device, the information of the third terminal device, and the same information of the fourth information and the fifth information; or alternatively

The fourth information is the same as the fifth information portion, and the first information includes: the information of the second terminal device, the information of the third terminal device, the different information of the fourth information and the fifth information, and the same information of the fourth information and the fifth information; or alternatively

The fourth information is different from the fifth information, and the first information includes: the fourth information, the fifth information, the second terminal device information, and the third terminal device information.

Optionally, the communication unit 610 is further configured to send first indication information to the second terminal device and the third terminal device, where the first indication information is used to indicate that the first terminal device has the capability and right to establish the first session connection for other terminal devices.

Optionally, the terminal device 600 further includes:

a processing unit 620, configured to trigger establishment of the first session connection for the second terminal device and the third terminal device.

Optionally, the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, the information of the third terminal device, and the group information corresponding to the first session.

Optionally, the communication unit 610 is further configured to receive second information sent by the network device, and send the second information to the second terminal device and the third terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device and the third terminal device, and the second information includes first IP address information and second IP address information, the first IP address information is IP address information allocated to the first session requested to be established by the second terminal device, the second IP address information is IP address information allocated to the first session requested to be established by the third terminal device, the first IP address information is suitable for an interface of the first session application requested to be established by the second terminal device to transmit data, and the second IP address information is suitable for an interface of the first session application requested to be established by the third terminal device to transmit data.

Optionally, the second information further comprises a multicast or multicast address, the multicast or multicast address is for the second end device and the third end device simultaneously, and the multicast or multicast address is adapted to transmit multicast or multicast data on the interface of the first session application.

Optionally, the second information further includes QoS parameters adapted to the sidelink direct interface; or alternatively

Optionally, the first terminal device has the capability and right to establish the first session connection for other terminal devices belonging to the same group.

Optionally, the capabilities and entitlements are preconfigured or configured for the network device or indicated for the application layer.

It should be understood that the terminal device 600 according to the embodiment of the present application may correspond to the first terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the terminal device 600 are respectively for implementing the corresponding flow of the first terminal device in the method 200 shown in fig. 3, and are not described herein again for brevity.

Fig. 11 shows a schematic block diagram of a network device 700 according to an embodiment of the present application. As shown in fig. 11, the network device 700 includes:

a communication unit 710, configured to receive first information sent by a first terminal device, where the first information is used to request establishment of a first session connection for the first terminal device or at least one terminal device, where the first session is for first service information, and the first session is at least applied to a sideline direct connection interface.

Optionally, the first information is used to request to establish the first session connection for the first terminal device, and the first information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

Optionally, the first session also applies to a cellular interface, the communication unit 710 is further configured to send first request information to an access network device serving the first terminal device, the first request information is used for requesting to establish the first session connection, and the first request information includes QoS parameters adapted to the cellular interface.

Optionally, the communication unit 710 is further configured to send second information to the first terminal device, where the second information is used to respond to the first session connection establishment request for the first terminal device, and the second information includes IP address information allocated for the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, the network device 700 further includes:

a processing unit 720, configured to obtain subscription information for the first terminal device, verify, according to the subscription information, whether the first terminal device belongs to a group corresponding to the first session, and verify whether the first terminal device allows initiating a connection establishment request of the first session;

the communication unit 710 is specifically configured to:

and after the verification is successful, sending the second information to the first terminal equipment.

Optionally, the processing unit 720 is further configured to obtain policy information corresponding to the first session, and allocate QoS parameters of an interface adapted to the first session application according to the policy information and a local policy.

Optionally, the at least one terminal device includes a second terminal device, the first information is used to request to establish the first session connection for the second terminal device, and the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, and the group information corresponding to the first session.

Optionally, the first session also applies to a cellular interface, the communication unit 710 is further configured to send second request information to an access network device serving the second terminal device, the second request information is used for requesting to establish the first session connection, and the second request information includes QoS parameters adapted to the cellular interface.

Optionally, the communication unit 710 is further configured to send second information to the first terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device, and the second information includes IP address information allocated for the first session and information of the second terminal device, and the IP address information is suitable for transmitting data on the interface of the first session application.

Optionally, the network device 700 further includes:

a processing unit 720, configured to obtain first subscription information for the first terminal device and second subscription information for the second terminal device;

the processing unit 720 is further configured to verify whether the first terminal device satisfies a first condition according to the first subscription information, and verify whether the second terminal device satisfies a second condition, where the first condition includes at least one of: belonging to a group corresponding to the first session, allowing to initiate a connection establishment request of the first session, authorizing establishment of the first session for the second terminal device, the second condition including at least one of: belonging to the group corresponding to the first session, and allowing to initiate a connection establishment request of the first session;

the communication unit 710 is specifically configured to:

Optionally, the at least one terminal device includes a second terminal device and a third terminal device, and the first information is used to request to establish the first session connection for the second terminal device and the third terminal device, where the first information includes at least one of the following information: the identifier information of the first session, the service type information, the interface information of the first session application, the information of the second terminal device, the information of the third terminal device, and the group information corresponding to the first session.

Optionally, the first session also applies to a cellular interface, the communication unit 710 is further configured to send second request information to access network devices serving the second terminal device and the third terminal device, respectively, the second request information being used for requesting to establish the first session connection, and the second request information including QoS parameters adapted to the cellular interface.

Optionally, the communication unit 710 is further configured to send second information to the first terminal device, where the second information is used to respond to the first session connection establishment request for the second terminal device and the third terminal device, where the second information includes first IP address information, second IP address information, information of the second terminal device, and information of the third terminal device, the first IP address information is IP address information allocated to the first session requested to be established by the second terminal device, the second IP address information is IP address information allocated to the first session requested to be established by the third terminal device, the first IP address information is applicable to transmit data on an interface of the first session application requested to be established by the second terminal device, and the second IP address information is applicable to transmit data on an interface of the first session application requested to be established by the third terminal device.

Optionally, the network device 700 further includes:

a processing unit 720, configured to obtain subscription information for the first terminal device, and verify whether the first terminal device meets a third condition according to the subscription information, where the third condition includes at least one of the following: belonging to the group corresponding to the first session, allowing to initiate a connection establishment request of the first session, and authorizing to establish the first session for the second terminal device and the third terminal device;

the communication unit 710 is specifically configured to:

It should be understood that the network device 700 according to the embodiment of the present application may correspond to a network device in the method embodiment of the present application, and the above and other operations and/or functions of each unit in the network device 700 are respectively for implementing a corresponding flow of the network device in the method 200 shown in fig. 3, and are not described herein again for brevity.

Fig. 12 shows a schematic block diagram of a terminal device 800 according to an embodiment of the application. The terminal device 800 is a second terminal device, as shown in fig. 12, the terminal device 800 includes:

a communication unit 810, configured to send third information to a first terminal device or a network device, where the third information is used to request to establish a first session, where the first session is directed to first service information, and the first session is at least applied to a sideline direct connection interface.

Optionally, the first service information includes at least one of the following information: the first service comprises group information related to the first service, external network server information, single network slice auxiliary information S-NSSAI information, combination information of the external network server information and the S-NSSAI, and session type information.

Optionally, the terminal devices under the same session for the first service belong to one group, and the first terminal device and the second terminal device belong to the same group.

Optionally, the communication unit 810 is further configured to receive first indication information sent by the first terminal device or the network device, where the first indication information is used to indicate that the first terminal device has the capability and right to establish the first session connection for other terminal devices.

Optionally, the communication unit 810 is specifically configured to:

actively triggering to send the third information to the first terminal equipment or the network equipment; or

When the link quality of a cellular interface in the second terminal device is lower than a first threshold, or the second terminal device cannot camp on a cell in the cellular interface, or the second terminal device cannot register to an available network, sending the third information to the first terminal device; or

And sending the third information to the network device when the link quality of the cellular interface in the second terminal device is greater than or equal to a first threshold value, or the second terminal device can reside in a cell, or the second terminal device can register to an available network.

Optionally, the communication unit 810 is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate that the second terminal device requests to establish the first session connection through the first terminal device or the network device;

the communication unit 810 is specifically configured to:

and determining to send the third information to the first terminal equipment or the network equipment according to the second indication information.

Optionally, the communication unit 810 is further configured to receive second information sent by the first terminal device or the network device, where the second information is used to respond to the first session connection establishment request for the second terminal device, and the second information includes internet protocol IP address information allocated for the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

Optionally, the first session is further applied to a cellular interface, and the second terminal device is in an idle state, and the communication unit is further configured to receive a paging message sent by the access network device, and enter a connected state.

It should be understood that the terminal device 800 according to the embodiment of the present application may correspond to a second terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the terminal device 800 are respectively for implementing a corresponding flow of the second terminal device in the method 200 shown in fig. 3, and are not described herein again for brevity.

Fig. 13 is a schematic structural diagram of a communication device 900 according to an embodiment of the present application. The communication device 900 shown in fig. 13 includes a processor 910, and the processor 910 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 13, the communication device 900 may further include a memory 920. From the memory 920, the processor 910 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 920 may be a separate device from the processor 910, or may be integrated in the processor 910.

Optionally, as shown in fig. 13, the communication device 900 may further include a transceiver 930, and the processor 910 may control the transceiver 930 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 930 may include a transmitter and a receiver, among others. The transceiver 930 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 900 may specifically be a network device in this embodiment, and the communication device 600 may implement a corresponding process implemented by the network device in each method in this embodiment, which is not described herein again for brevity.

Optionally, the communication device 900 may specifically be a mobile terminal/terminal device according to this embodiment, and the communication device 900 may implement a corresponding process implemented by the mobile terminal/terminal device in each method according to this embodiment, which is not described herein again for brevity.

Fig. 14 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1000 shown in fig. 14 includes a processor 1010, and the processor 1010 may call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 14, the chip 1000 may further include a memory 1020. From the memory 1020, the processor 1010 may call and execute a computer program to implement the method in the embodiment of the present application.

The memory 1020 may be a separate device from the processor 1010 or may be integrated into the processor 1010.

Optionally, the chip 1000 may further include an input interface 1030. The processor 1010 may control the input interface 1030 to communicate with other devices or chips, and in particular, may obtain information or data sent by the other devices or chips.

Optionally, the chip 1000 may further include an output interface 1040. The processor 1010 may control the output interface 1040 to communicate with other devices or chips, and may particularly output information or data to the 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 a corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

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

Fig. 15 is a schematic block diagram of a communication system 1100 provided in an embodiment of the present application. As shown in fig. 15, the communication system 1100 includes a terminal device 1110 and a network device 1120.

The terminal device 1110 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the network device 1120 may be configured to implement the corresponding function implemented by the network device in the foregoing method, which is not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A 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 connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. The volatile Memory may be a Random Access Memory (RAM) which serves as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting, for example, the memories 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 (DDR SDRAM), enhanced synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

An embodiment of the present application further provides a computer-readable storage medium for storing a computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables a computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for session establishment, comprising:

the method comprises the steps that first user equipment sends first information to network equipment, wherein the first information is used for requesting to establish a first session connection aiming at least one user equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface;

the first service information includes the following information: group information related to the first service, external network server information, single-network slicing auxiliary information S-NSSAI, combined information of the external network server information and the S-NSSAI, and session type information;

the user equipment under the session aiming at the first service belongs to a group, and the at least one user equipment and the first user equipment belong to the same group; the first service is a network control interactive service NCIS service.

2. The method of claim 1, wherein the at least one user equipment comprises a second user equipment, and wherein the first information is used to request establishment of the first session connection for the second user equipment.

3. The method of claim 2, further comprising:

before the first user equipment sends first information to network equipment, the first user equipment receives third information sent by the second user equipment, the third information is used for requesting to establish the first session connection for the second user equipment, and the third information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

4. The method of claim 3, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, and the group information corresponding to the first session.

5. The method of claim 3, wherein the first information comprises the third information and information of the second user equipment.

6. The method according to any one of claims 3 to 5, further comprising:

the first user equipment sends first indication information to the second user equipment, wherein the first indication information is used for indicating that the first user equipment has the capability and the right of establishing the first session for other user equipment.

7. The method of claim 2, further comprising:

the first user equipment triggers establishment of the first session connection for the second user equipment.

8. The method of claim 7, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, and the group information corresponding to the first session.

9. The method according to any one of claims 2 to 5, further comprising:

the first user equipment receives second information sent by the network equipment and sends the second information to the second user equipment, the second information is used for responding to the first session connection establishment request aiming at the second user equipment, the second information comprises IP address information distributed aiming at the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

10. The method according to claim 9, wherein the second information further comprises a multicast or multicast address adapted for transmitting multicast or multicast data on an interface of the first session application.

11. The method of claim 9,

the second information further comprises QoS parameters adapted to the sideline direct connection interface; or

12. The method of claim 1, wherein the at least one user device comprises a second user device and a third user device, and wherein the first information is used to request establishment of the first session connection for the second user device and the third user device.

13. The method of claim 12, further comprising:

before first user equipment sends first information to network equipment, the first user equipment receives fourth information sent by the second user equipment and receives fifth information sent by the third user equipment, wherein,

the fourth information is for requesting establishment of the first session connection for the second user equipment, and the fourth information includes at least one of: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session;

the fifth information is for requesting establishment of the first session connection for the third user equipment, and the fifth information comprises at least one of: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

14. The method of claim 13,

the fourth information is the same as the fifth information, and the first information includes: the information of the second user equipment, the information of the third user equipment, and the same information in the fourth information and the fifth information; or alternatively

The fourth information is the same as the fifth information part, and the first information includes: the information of the second user equipment, the information of the third user equipment, the different information of the fourth information and the fifth information, and the same information of the fourth information and the fifth information; or

The fourth information is different from the fifth information, and the first information includes: the fourth information, the fifth information, the information of the second user equipment, and the information of the third user equipment.

15. The method of claim 13, further comprising:

and the first user equipment sends first indication information to the second user equipment and the third user equipment, wherein the first indication information is used for indicating that the first user equipment has the capability and the right of establishing the first session connection for other user equipment.

16. The method of claim 12, further comprising:

the first user equipment triggers establishment of the first session connection for the second user equipment and the third user equipment.

17. The method of claim 16, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, the information of the third user equipment, and the group information corresponding to the first session.

18. The method according to any one of claims 12 to 17, further comprising:

the first user equipment receives second information sent by the network equipment and sends the second information to the second user equipment and the third user equipment, the second information is used for responding to the first session connection establishment request aiming at the second user equipment and the third user equipment, the second information comprises first IP address information and second IP address information, the first IP address information is IP address information distributed to the first session established aiming at the second user equipment request, the second IP address information is IP address information distributed to the first session established aiming at the third user equipment request, the first IP address information is suitable for data transmission on the interface of the first session application established by the second user equipment request, and the second IP address information is suitable for data transmission on the interface of the first session application established by the third user equipment request.

19. The method of claim 18, wherein the second information further comprises a multicast or multicast address, wherein the multicast or multicast address is for the second user equipment and the third user equipment simultaneously, and wherein the multicast or multicast address is adapted to transmit multicast or multicast data on the interface of the first session application.

20. The method of claim 18,

the second information further comprises QoS parameters adapted to the sideline direct connection interface; or alternatively

21. The method according to any of claims 12-17, wherein the first user equipment is provided with the capability and right to establish the first session connection for other user equipments belonging to the same group.

22. The method of claim 21, wherein the capabilities and entitlements are pre-configured or configured for the network device or indicated for an application layer.

23. A method for session establishment, comprising:

the method comprises the steps that network equipment receives first information sent by first user equipment, wherein the first information is used for requesting to establish a first session connection aiming at least one user equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface;

24. The method of claim 23, wherein the at least one ue comprises a second ue and a third ue, and wherein the first information is used to request establishment of the first session connection for the second ue and the third ue, wherein the first information comprises at least one of: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, the information of the third user equipment, and the group information corresponding to the first session.

25. The method of claim 24, wherein the first session is further applied to a cellular interface, and wherein the method further comprises:

the network device sends second request information to access network devices serving the second user device and the third user device, respectively, the second request information requesting establishment of the first session connection, and the second request information including QoS parameters adapted to a cellular interface.

26. The method of claim 25, further comprising:

the network device sends second information to the first user device, where the second information is used to respond to the first session connection establishment request for the second user device and the third user device, where the second information includes first IP address information, second IP address information, information of the second user device, and information of the third user device, the first IP address information is IP address information allocated to the first session requested to be established by the second user device, the second IP address information is IP address information allocated to the first session requested to be established by the third user device, the first IP address information is applicable to data transmission on an interface of the first session application requested to be established by the second user device, and the second IP address information is applicable to data transmission on an interface of the first session application requested to be established by the third user device.

27. The method of claim 26, further comprising:

the network device obtains subscription information for the first user device, and verifies whether the first user device meets a third condition according to the subscription information, wherein the third condition includes at least one of the following conditions: the second user equipment and the third user equipment are authorized to establish the first session;

the network device sends second information to the first user equipment, and the second information comprises:

after successful verification, the network device sends the second information to the first user device.

28. The method of claim 27, further comprising:

and the network equipment acquires the strategy information corresponding to the first session and distributes the QoS parameters of the interface applicable to the first session according to the strategy information and the local strategy.

29. Method according to any of the claims 26 to 28, wherein said second information further comprises a multicast or multicast address adapted for transmitting multicast or multicast data on an interface of said first session application.

30. The method of any one of claims 26 to 28,

the second information also comprises a quality of service (QoS) parameter suitable for a sideline direct connection interface; or alternatively

31. A session establishment method, comprising:

the second user equipment sends third information to the first user equipment or the network equipment, wherein the third information is used for requesting to establish a first session, the first session is specific to first service information, and the first session is at least applied to a sideline direct connection interface;

the user equipment under the session aiming at the first service belongs to a group, and the first user equipment and the second user equipment belong to the same group; the first service is a network control interactive service NCIS service.

32. The method of claim 31, further comprising:

and the second user equipment receives first indication information sent by the first user equipment or the network equipment, wherein the first indication information is used for indicating that the first user equipment has the capability and the right of establishing the first session connection for other user equipment.

33. The method of claim 32, wherein the second user equipment sends third information to the first user equipment or the network device, and wherein the third information comprises:

the second user equipment actively triggers to send the third information to the first user equipment or the network equipment; or alternatively

The second user equipment sends the third information to the first user equipment when the link quality of a cellular interface in the second user equipment is lower than a first threshold, or the second user equipment cannot reside in a cell in the cellular interface, or the second user equipment cannot register to an available network; or

And when the link quality of the cellular interface in the second user equipment is greater than or equal to a first threshold, or the second user equipment can reside in a cell, or the second user equipment can register to an available network, the second user equipment sends the third information to the network equipment.

34. The method of claim 32, further comprising:

the second user equipment receives second indication information sent by the network equipment, wherein the second indication information is used for indicating the second user equipment to request to establish the first session connection through the first user equipment or the network equipment;

the second user equipment sends third information to the first user equipment or the network equipment, and the third information comprises the following steps:

and the second user equipment determines to send the third information to the first user equipment or the network equipment according to the second indication information.

35. The method of claim 32, further comprising:

the second user equipment receives second information sent by the first user equipment or the network equipment, the second information is used for responding to the first session connection establishment request aiming at the second user equipment, the second information comprises Internet Protocol (IP) address information distributed aiming at the first session, and the IP address information is suitable for transmitting data on an interface of the first session application.

36. The method of claim 35, wherein the second information further comprises a multicast or multicast address, wherein the multicast or multicast address is adapted to transmit multicast or multicast data on the interface of the first session application.

37. The method of claim 35,

the second information also comprises QoS parameters suitable for a sidelink direct connection interface; or

38. The method according to any of claims 31-37, wherein the first session is also applied to a cellular interface and the second user equipment is in an idle state, the method further comprising:

and the second user equipment receives the paging message sent by the access network equipment and enters a connection state.

39. A user device, wherein the user device is a first user device, and wherein the user device comprises:

the communication unit is used for sending first information to network equipment, wherein the first information is used for requesting to establish a first session connection aiming at least one user equipment, the first session aims at first service information, and the first session is at least applied to a sideline direct connection interface;

40. The user equipment of claim 39, wherein the at least one user equipment comprises a second user equipment, and wherein the first information is used to request establishment of the first session connection for the second user equipment.

41. The user equipment as recited in claim 40,

the communication unit is further configured to receive third information sent by the second user equipment before sending the first information to the network device, where the third information is used to request to establish the first session connection for the second user equipment, and the third information includes at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, and the group information corresponding to the first session.

42. The UE of claim 41, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, and the group information corresponding to the first session.

43. The UE of claim 41, wherein the first information comprises the third information and information of the second UE.

44. The UE of any one of claims 41 to 43, wherein the communication unit is further configured to send first indication information to the second UE, and wherein the first indication information is used to indicate that the first UE has the capability and right to establish the first session for other UEs.

45. The user equipment of claim 40, wherein the first user equipment further comprises:

a processing unit, configured to trigger establishment of the first session connection for the second user equipment.

46. The UE of claim 45, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, and the group information corresponding to the first session.

47. The UE of any one of claims 41 to 43, wherein the communication unit is further configured to receive second information sent by the network device, and send the second information to the second UE, the second information is used for responding to the first session connection establishment request for the second UE, and the second information includes IP address information allocated for the first session, the IP address information is suitable for transmitting data on an interface of the first session application.

48. The UE of claim 47, wherein the second information further comprises a multicast or multicast address, and wherein the multicast or multicast address is adapted to transmit multicast or multicast data on the interface of the first session application.

49. The user equipment of claim 47,

The second information further comprises QoS parameters suitable for the sidelink direct connection interface and QoS parameters suitable for the cellular interface, and the QoS parameters suitable for the sidelink direct connection interface are the same as or different from the QoS parameters suitable for the cellular interface.

50. The UE of claim 39, wherein the at least one UE comprises a second UE and a third UE, and wherein the first information is used to request establishment of the first session connection for the second UE and the third UE.

51. The UE of claim 50, wherein the communication unit is further configured to receive fourth information sent by the second UE and receive fifth information sent by the third UE before sending the first information to the network device, wherein,

52. The user equipment of claim 51,

53. The UE of claim 51, wherein the communication unit is further configured to send first indication information to the second UE and the third UE, and wherein the first indication information is used to indicate that the first UE has the capability and right to establish the first session connection for other UEs.

54. The user equipment as recited in claim 50, wherein the first user equipment further comprises:

a processing unit, configured to trigger establishment of the first session connection for the second user equipment and the third user equipment.

55. The UE of claim 54, wherein the first information comprises at least one of the following information: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, the information of the third user equipment, and the group information corresponding to the first session.

56. The ue according to any one of claims 50 to 55, wherein the communication unit is further configured to receive second information sent by the network device, and send the second information to the second ue and the third ue, the second information is used to respond to the first session connection establishment request for the second ue and the third ue, and the second information includes first IP address information and second IP address information, the first IP address information is IP address information allocated to the first session requested to be established by the second ue, the second IP address information is IP address information allocated to the first session requested to be established by the third ue, the first IP address information is suitable for the interface upload data of the first session application requested to be established by the second ue, and the second IP address information is suitable for the interface upload data of the first session requested to be established by the third ue.

57. The UE of claim 56, wherein the second information further comprises a multicast address, wherein the multicast address is for the second UE and the third UE at the same time, and wherein the multicast address is adapted to transmit multicast data on the interface of the first session application.

58. The user equipment of claim 56,

59. The UE of any one of claims 41 to 43, wherein the first UE has the capability and right to establish the first session connection for other UEs belonging to the same group.

60. The UE of claim 59, wherein the capabilities and entitlements are pre-configured or configured for the network device or indicated for an application layer.

61. A network device, comprising:

the communication unit is used for receiving first information sent by first user equipment, wherein the first information is used for requesting to establish a first session connection of at least one user equipment, the first session is specific to first service information, and the first session is at least applied to a sideline direct connection interface;

the first service information includes at least one of the following information: group information related to the first service, external network server information, single-network slicing auxiliary information S-NSSAI information, combined information of the external network server information and the S-NSSAI, and session type information;

62. The network device of claim 61, wherein the at least one user device comprises a second user device, wherein the first information is used to request establishment of the first session connection for the second user device, and wherein the first information comprises at least one of: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, and the group information corresponding to the first session.

63. The network device of claim 62, wherein the first session is further applied to a cellular interface, wherein the communication unit is further configured to send second request information to an access network device serving the second user equipment, wherein the second request information is used to request the establishment of the first session connection, and wherein the second request information comprises QoS parameters adapted to the cellular interface.

64. The network device of claim 62, wherein the communication unit is further configured to send second information to the first user device, the second information is used for responding to the first session connection establishment request for the second user device, and the second information comprises IP address information allocated for the first session and information of the second user device, the IP address information is suitable for transmitting data on an interface of the first session application.

65. The network device of claim 64, wherein the network device further comprises:

a processing unit, configured to acquire first subscription information for the first user equipment and second subscription information for the second user equipment;

the processing unit is further configured to verify whether the first user equipment meets a first condition according to the first subscription information, and verify whether the second user equipment meets a second condition, where the first condition includes at least one of: the second session is authorized to be established for the second user equipment, and the second condition includes at least one of the following conditions: the group belongs to the group corresponding to the first session, and the connection establishment request of the first session is allowed to be initiated;

the communication unit is specifically configured to:

after the verification is successful, the second information is sent to the first user equipment.

66. The network device of claim 65, wherein the processing unit is further configured to obtain policy information corresponding to the first session, and allocate QoS parameters for an interface adapted to the first session application according to the policy information and a local policy.

67. The network device of any one of claims 61-66, wherein the at least one UE comprises a second UE and a third UE, and wherein the first information is used to request establishment of the first session connection for the second UE and the third UE, and wherein the first information comprises at least one of: the identification information of the first session, the service type information, the interface information of the first session application, the information of the second user equipment, the information of the third user equipment, and the group information corresponding to the first session.

68. The network device of claim 67, wherein the first session is further applied to a cellular interface, wherein the communication unit is further configured to send second request information to access network devices serving the second user device and the third user device, respectively, wherein the second request information is used for requesting to establish the first session connection, and wherein the second request information comprises QoS parameters adapted to the cellular interface.

69. The network device according to claim 67, wherein the communication unit is further configured to send second information to the first user device, the second information is configured to respond to the first session connection establishment request for the second user device and the third user device, wherein the second information includes first IP address information, second IP address information, information about the second user device, and information about the third user device, the first IP address information is IP address information allocated to the first session requested to be established by the second user device, the second IP address information is IP address information allocated to the first session requested to be established by the third user device, the first IP address information is suitable for transmitting data on the interface of the first session application requested to be established by the second user device, and the second IP address information is suitable for transmitting data on the interface of the first session requested to be established by the third user device.

70. The network device of claim 69, wherein the network device further comprises:

a processing unit, configured to obtain subscription information for the first user equipment, and verify whether the first user equipment meets a third condition according to the subscription information, where the third condition includes at least one of: the second user equipment and the third user equipment are authorized to establish the first session;

the communication unit is specifically configured to:

71. The network device of claim 70, wherein the processing unit is further configured to obtain policy information corresponding to the first session, and allocate QoS parameters for an interface adapted to the first session application according to the policy information and a local policy.

72. Network device according to any of claims 64 to 66, wherein said second information further comprises a multicast or multicast address adapted for transmitting multicast or multicast data on an interface of said first session application.

73. The network device of any of claims 64-66,

74. A user equipment, wherein the user equipment is a second user equipment, and wherein the user equipment comprises:

the communication unit is configured to send third information to a first user equipment or a network device, where the third information is used to request establishment of a first session, where the first session is directed to first service information, and the first session is at least applied to a sideline direct connection interface;

75. The UE of claim 74, wherein the communication unit is further configured to receive first indication information sent by the first UE or the network device, and wherein the first indication information indicates that the first UE has the capability and right to establish the first session connection for other UEs.

76. The UE of claim 74, wherein the communication unit is specifically configured to:

actively triggering to send the third information to the first user equipment or the network equipment; or

Sending the third information to the first user equipment when the link quality of a cellular interface in the second user equipment is lower than a first threshold, or the second user equipment cannot reside in a cell in the cellular interface, or the second user equipment cannot register to an available network; or

And sending the third information to the network equipment when the link quality of the cellular interface in the second user equipment is greater than or equal to a first threshold, or the second user equipment can reside in a cell, or the second user equipment can register to an available network.

77. The UE of claim 74, wherein the communication unit is further configured to receive second indication information sent by the network device, and the second indication information is used to indicate that the second UE requests to establish the first session connection through the first UE or the network device;

the communication unit is specifically configured to:

and determining to send the third information to the first user equipment or the network equipment according to the second indication information.

78. The UE of any one of claims 74 to 77, wherein the communication unit is further configured to receive second information sent by the first UE or the network device, the second information being used for responding to the first session connection establishment request for the second UE, and the second information comprising IP address information allocated for the first session, the IP address information being suitable for transmitting data on an interface of the first session application.

79. The UE of claim 78, wherein the second information further comprises a multicast or multicast address, and wherein the multicast or multicast address is adapted to transmit multicast or multicast data on the interface of the first session application.

80. The user equipment of claim 78,

81. The UE of any one of claims 74 to 77, wherein the first session is also applied to a cellular interface, and wherein the second UE is in an idle state, and wherein the communication unit is further configured to receive a paging message sent by an access network device, and to enter a connected state.

82. A user device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 22.

83. A network device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 23 to 30.

84. A user device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 31 to 38.

85. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 1 to 22.

86. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 23 to 30.

87. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 31 to 38.

88. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 22.

89. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 23 to 30.

90. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 31 to 38.