CN115152255A

CN115152255A - Relay method and communication device

Info

Publication number: CN115152255A
Application number: CN202080097531.0A
Authority: CN
Inventors: 刘建华; 卢前溪; 杨皓睿
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2022-10-04
Also published as: WO2021212374A1

Abstract

The application relates to a relay method, a terminal device and a network device. The method comprises the following steps: the first device transmits relay selection information for instructing the second device to select a relay based on the public land mobile network PLMN information. According to the embodiment of the application, other equipment can be indicated to select the relay according to the PLMN information through the relay selection information, so that the equipment can be accessed to the network through a proper relay.

Description

Relay method and communication device

Technical Field

The present application relates to the field of communications, and in particular, to a relay method and a communication device.

Background

Network Controlled Interactive Services (NCIS) service of a next Generation communication (5 th-Generation, 5G) Network mainly aims at applications such as Augmented Reality (AR)/Virtual Reality (VR), games, and has high requirements on service quality such as rate, time delay, packet loss rate, high-speed coding and decoding. For example: for VR games, 10Gbps rate needs to be achieved, and the packet loss rate cannot exceed 10E-4.

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, for example: and (5) grouping in the game. The communication modes of the UEs in the NCIS group may include the following cases, and different communication modes may be used in combination:

adjacent to each other, for example: broadcast or multicast using Device to Device (D2D) technology, or set up a sidelink (sidelink) (also known as using a PC5 interface) for 1-to-1 communication (unicast);

away from each other, e.g. using UE-network-server-peer-network-peer-UE (also referred to as using Uu interface).

One implementation of the NCIS service is that the UE transmits data using a relay (relay). Under a 5G network, it is unclear how the terminal selects a relay to access the network.

Disclosure of Invention

The embodiment of the application provides a relay method and communication equipment, which can enable the equipment to select a proper relay access network.

An embodiment of the present application provides a relay method, including: the first device sends relay selection information for instructing the second device to select a relay based on Public Land Mobile Network (PLMN) information.

An embodiment of the present application provides a relay method, including: the third device sends a relay authorization indication.

An embodiment of the present application provides a relay method, including: the second equipment receives relay selection information, wherein the relay selection information is used for indicating the second equipment to select a relay according to PLMN information of a public land mobile network; and the second equipment selects a relay according to the PLMN information.

An embodiment of the present application provides a communication device, including: and the processing unit is used for sending relay selection information, and the relay selection information is used for instructing the second equipment to select a relay according to the PLMN information of the public land mobile network.

An embodiment of the present application provides a communication device, including: a sending unit, configured to send a relay authorization indication.

An embodiment of the present application provides a communication device, including: a receiving unit, configured to receive relay selection information, where the relay selection information is used to instruct a second device to select a relay according to PLMN information of a public land mobile network; and the selecting unit is used for selecting the relay according to the PLMN information.

An embodiment of the application provides a communication device, which comprises 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 to execute the relay method.

The embodiment of the application provides a chip for realizing the relay method. Specifically, the chip includes: and the processor is used for calling and running the computer program from the memory so that the equipment provided with the chip executes the relay method.

An embodiment of the present application provides a computer-readable storage medium for storing a computer program, where the computer program enables a computer to execute the relay method described above.

An embodiment of the present application provides a computer program product, which includes computer program instructions, and the computer program instructions enable a computer to execute the relay method described above.

Embodiments of the present application provide a computer program, which when run on a computer, causes the computer to execute the relay method described above.

According to the embodiment of the application, other equipment can be indicated to select the relay according to the PLMN information through the relay selection information, so that the equipment can be accessed to the network through a proper relay.

Drawings

Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.

Fig. 2 is a schematic flow chart diagram of a relay method according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a relay method according to another embodiment of the present application.

Fig. 4 is a schematic flow chart of a relay method according to another embodiment of the present application.

Fig. 5 is an architecture diagram of a terminal-to-network relay.

Fig. 6 and 7 are schematic diagrams of the relay mode.

Fig. 8 is a diagram illustrating a PCF authorizing a relay terminal to indicate relay selection using system information.

Fig. 9 is a diagram illustrating a PCF authorizing a relay terminal to indicate relay selection using system information and a discovery message.

Fig. 10 is a schematic diagram of PCF authorizing a remote terminal to select a relay.

Fig. 11 is a schematic block diagram of a communication device according to an embodiment of the present application.

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

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

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

FIG. 15 is a schematic block diagram of a chip according to an embodiment of the present application.

Fig. 16 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

The 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.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: 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 (UMTS) System, a Wireless Local Area Network (WLAN) 5 (Wireless Local Area network, or the like), and a Wireless Local Area network (WLAN-5) System.

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 frequency spectrum of the application is not limited in the embodiment 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.

The embodiments of the present application have been described with reference to a network device and a terminal 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 equipment that uses wearable technique to carry out intelligent design, develop can dress to daily wearing, such as glasses, gloves, wrist-watch, dress and shoes. 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 functions, and need to be used in cooperation with other devices such as smart phones, 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 of the present application, 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.

Fig. 1 exemplarily shows one network device 110 and two terminal devices 120, and optionally, the wireless communication system 100 may include a plurality of network devices 110, and each network device 110 may include other numbers of terminal devices 120 within the coverage area, which is not limited in this embodiment.

Optionally, the wireless communication system 100 may further include other network entities such as a Mobility Management Entity (MME), an Access and Mobility Management Function (AMF), which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

Fig. 2 is a schematic flow chart diagram of a relay method 200 according to an embodiment of the present application. The method may alternatively be applied to the system shown in fig. 1, but is not limited thereto. The method includes at least part of the following.

S210, the first device sends relay selection information, where the relay selection information is used to instruct the second device to select a relay according to Public Land Mobile Network (PLMN) information.

In an exemplary scenario, in the NCIS service of the 5G network, the terminals in the NCIS group may be from the same PLMN or from different PLMNs. For example, there are 5 UEs in an NCIS group, where 3 are UEs of PLMN1 and 2 are UEs of PLMN2. The UEs of 3 PLMNs 1 may communicate directly with each other at the PC5 interface using a D2D method, and the UEs of 3 PLMNs 1 may also communicate with the UEs of 2 PLMNs 2 using a network. The first device may be a relay terminal in the NCIS group, and the second device may be a remote terminal in the NCIS group. If the terminal uses relay (relay) to transmit data, the remote terminal needs to discover and select a relay terminal before communication. The relay terminal may send relay selection information to one or more remote terminals. The remote terminal receiving the relay selection information can determine whether to select the relay terminal as a relay of the access network according to the PLMN information in the relay selection information.

Optionally, in an embodiment of the present application, the method further includes: the first device receives a relay authorization indication from a third device. The relay authorization indication may instruct the first device to send authorization selection information to the second device.

Optionally, in this embodiment of the present application, the third device is a Policy Control network element (PCF). In a 5G network, the PCF may communicate with the terminal, sending policy rules to the terminal. In the embodiment of the present application, the PCF may send a relay authorization indication to the terminal.

Optionally, in this embodiment of the present application, the relay authorization indication includes at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.

Optionally, in this embodiment of the present application, the different PLMNs include at least one of:

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.

Optionally, in this embodiment, the relay-allowed PLMN information may be regarded as a white list. For example, the relay-allowed PLMN information includes PLMN1 and PLMN2.

Optionally, in this embodiment of the present application, PLMN information that is not allowed to be relayed may be regarded as a black list. For example, the PLMN information that does not allow relaying includes PLMN3 and PLMN4.

Optionally, in this embodiment of the present application, the specific information allowing the data to be relayed for the devices of different PLMNs may include a specific group and/or a specific service, which may be regarded as a white list. For example, certain groups G1, G2 allow relaying data for devices of different PLMNs, and certain groups S1, S2 allow relaying data for devices of different PLMNs.

Optionally, in this embodiment of the present application, the specific information that does not allow data to be relayed for devices of different PLMNs may also include a specific group and/or a specific service, which may be regarded as a blacklist. For example, certain groups G3, G4 are not allowed to relay data for devices of different PLMNs, and certain groups S3, S4 are not allowed to relay data for devices of different PLMNs.

Optionally, in an embodiment of the present application, the method further includes: the first device receives first system information from a fourth device.

Optionally, in this embodiment of the present application, the fourth device is a base station. For example, the fourth device is a base station in NG-RAN (Radio Access Network).

Optionally, in this embodiment of the present application, the relay selection information may include system information and may also include a discovery message, which are respectively described below.

In a first manner, the relay selection information includes second system information forwarded by the first device.

Optionally, in this embodiment of the present application, the second system information includes at least one of:

all PLMN information in the first system information;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

Specifically, according to the content of the relay authorization indication received by the first device, after receiving the first system information, the first device may determine the content of the second system information forwarded to the second device.

For example, in case the relay authorization indication comprises permission to relay data for devices of different PLMNs, the first device may not modify the first system information, that is, the second system information may comprise all PLMN information in the first system information.

For another example, in a case that the relay authorization indication includes that data is not allowed to be relayed for devices of different PLMNs, the first device may delete the related information of the different PLMNs in the first system information, that is, the related information of the different PLMNs may not be included in the second system information. For example, the first device belongs to the PLMN1, and deletes the information related to the PLMN different from the PLMN1, such as the PLMN2 and the PLMN3, in the system information.

As another example, in the case that the relay authorization indication includes specific information allowing data to be relayed for devices of different PLMNs, the second system information includes specific information allowing data to be relayed for devices of different PLMNs, such as specific groups G1, G2, specific services S1, S2, and so on.

As another example, in the case that the relay authorization indication includes specific information that allows relaying data for devices of different PLMNs, the second system information includes specific information that does not allow relaying data for devices of different PLMNs, such as specific groups G3, G4, specific services S3, S4, and so on.

As another example, in the case that the relay authorization indication includes PLMN information allowing relaying, the second system information includes PLMN information allowing relaying, for example, PLMN1, PLMN2.

As another example, in the case that the relay authorization indication includes PLMN information that does not allow relaying, the second system information does not include PLMN information that does not allow relaying, for example, PLMN3 and PLMN4.

In a second mode, the relay selection information includes a discovery message sent by the first device. After the first device receives the relay authorization indication, the system message may not be modified, but the discovery message may be sent to the second device. After the first device receives the relay authorization indication, it may also both modify the system message and send a discovery message to the second device.

Optionally, in an embodiment of the present application, the discovery message includes at least one of:

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

disallowing relaying of data specific information for devices of different PLMNs;

PLMN information of the first device.

For example, PLMN information of Xu Zhongji, such as PLMN1 and PLMN2, is allowed in the authorization indication information included in the discovery message.

For another example, PLMN information that does not allow relaying in the authorization indication information, e.g., PLMN3, PLMN4, is included in the discovery message.

For another example, specific information allowing data to be relayed for devices of different PLMNs in the authorization indication information, such as specific groups G1, G2, specific services S1, S2, etc., is included in the discovery message.

For another example, specific information that the authorization indication information does not allow data to be relayed for devices of different PLMNs is included in the discovery message, such as specific groups G3, G4, specific services S3, S4, and so on.

As another example, PLMN information of the first device, e.g., PLMN1, is included in the discovery message.

Optionally, in this embodiment of the present application, the PLMN information of the first device includes at least one of serving PLMN information of the first device, registered public land mobile network (Registered PLMN, RPLMN) information, and local public land mobile network (Home PLMN, HPLMN) information.

According to the embodiment of the application, other equipment can be indicated to select the relay according to the PLMN information through the relay selection information, so that the equipment can be accessed to the network through a proper relay. For example, the relay terminal can instruct the remote terminal to select an appropriate relay access network based on the PLMN information.

Fig. 3 is a schematic flow chart diagram of a relay method 300 according to an embodiment of the present application. The method may alternatively be applied to the system shown in fig. 1, but is not limited thereto. The method includes at least some of the following.

And S310, the third equipment sends a relay authorization instruction.

In one example, the third device may send a relay authorization indication to the first device, which may instruct the first device to send authorization selection information to the second device. If the third device can send a relay authorization indication to the first device, the first device may send authorization selection information, such as second system information and/or a discovery message, to the remote device according to the relay authorization indication.

In another example, the third device may also send a relay authorization indication to the second device, which may instruct the second device to select a relay of the access network according to the PLMN information. If the third device can send the relay authorization indication to the second device, the first device may directly forward the received first system information and/or discovery message to the second device.

Optionally, in this embodiment of the present application, the third device is a policy control network element PCF, and in a 5G network, the PCF may communicate with the terminal and send the policy rule to the terminal. The third device sends the relay authorization indication, which may include at least one of:

the PCF sends a relay authorization indication to a first device, such as a relay terminal;

the PCF sends a relay authorization indication to a second device, e.g., a remote terminal.

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

Optionally, in this embodiment of the present application, the specific information includes a specific group and/or a specific service.

For a specific example of the method 300 executed by the network device in this embodiment, reference may be made to the related description of the method 200 about the network device, for example, PCF, and for brevity, no further description is provided here.

According to the embodiment of the application, the relay authorization indication can indicate other equipment to select the relay according to the PLMN information, so that the equipment can access the network through a proper relay. For example, a network device such as PCF can instruct the remote terminal to select a suitable relay access network according to the PLMN information through a relay authorization.

Fig. 4 is a schematic flow chart diagram of a relay method 400 according to an embodiment of the present application. The method may alternatively be applied to the system shown in fig. 1, but is not limited thereto. The method includes at least part of the following.

And S410, the second equipment receives relay selection information, wherein the relay selection information is used for instructing the second equipment to select a relay according to the PLMN information of the public land mobile network.

And S420, the second equipment selects a relay according to the PLMN information.

In one example, the second device may receive relay selection information, such as second system information and/or a discovery message, from the first device. The second device may then determine whether to select the first device as a relay for the access network based on the relay selection information and its PLMN information.

In another example, the second device may also receive a relay authorization indication from the network device. The second device may then determine whether to select the first device as a relay for accessing the network based on the relay authorization indication and the PLMN information for the first device. The PLMN information of the first device may be sent to the second device by relaying selection information, e.g. second system information and/or discovery messages.

Optionally, in this embodiment of the present application, the relay selection information includes second system information from the first device, where the second system information includes at least one of:

all PLMN information in a first system message received by a first device from a network device;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for different PLMNs;

no specific information relayed for different PLMNs is allowed.

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.

The manner in which the relay is selected may also be different if the information received by the second device is different. Several exemplary scenarios follow.

In scenario one, if the second device receives the second system information from the first device, the second device may select a relay of the access network according to the second system information. Specifically, in this scenario, the manner in which the second device selects the relay includes one of:

in the case that the PLMN information of the second device is in the second system information, the second device selects the first device as a relay of the access network;

under the condition that the PLMN information of the second equipment is in the PLMN information allowing the relay, the second equipment selects the first equipment as the relay of the access network;

under the condition that the PLMN information of the second equipment is in the PLMN information which does not allow the relay, the second equipment does not select the first equipment as the relay of the access network;

in the case that the specific information of the second device is among the specific information allowing relaying data for devices of different PLMNs, the second device selects the first device as a relay of the access network;

in case the specific information of the second device is in specific information that does not allow relaying data for devices of different PLMNs, the second device does not select the first device as a relay of the access network.

Optionally, in this embodiment of the present application, the specific information of the second device in the specific information that allows data to be relayed for devices of different PLMNs includes: the group in which the second device is located, the service to be initiated, or the group of services to be initiated is in specific information allowing relaying of data for devices of different PLMNs. Accordingly, the specific information of the second device in case of not allowing the specific information of relaying data for devices of different PLMNs comprises: the group in which the second device is located, the service to be initiated, or the group of services to be initiated is in specific information that does not allow relaying data for devices of different PLMNs.

In scenario two, if the second device receives the second system information and the discovery message from the first device, the second device may synthetically select a relay of the access network according to the second system information and the discovery message.

Optionally, in this embodiment of the present application, the relay selection information includes a discovery message from a first device, for example, a relay terminal.

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

Specifically, in this scenario, the manner in which the second device selects the relay includes at least one of:

selecting the first device as a relay of the access network under the condition that the PLMN information of the second device is in the second system information and the PLMN information allowing the relay in the discovery message;

under the condition that the PLMN information of the second equipment is in the second system information and the PLMN information which does not allow relay in the discovery message, the first equipment is not selected as the relay of the access network;

in case the specific information of the second device allows relaying data for devices of different PLMNs in the second system information and the discovery message, the second device selects the first device as a relay of the access network;

in the case that the specific information of the second device does not allow relaying data for devices of different PLMNs in the second system information and the discovery message, the second device does not select the first device as a relay of the access network;

in case the discovery message does not include PLMN information, a relay of the access network is selected according to the second system information. The manner in which the second device selects the relay accessing the network according to the second system information may refer to the related description of scenario one above.

Optionally, in this embodiment of the present application, the PLMN information of the first device includes at least one of serving PLMN information of the first device, registered public land mobile network RPLMN information, and HPLMN information.

In a third scenario, if the second device receives a relay authorization indication from the network device, the second device may select a relay accessing the network according to the relay authorization indication.

Optionally, in an embodiment of the present application, the method further includes: the second device receives a relay authorization indication.

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

In particular, in this scenario, the second device may maintain a list of PLMN networks that allow relaying, or a list of specific information that allows relaying data for devices of different PLMNs, according to the relay authorization indication. The discovery message received by the second device from the first device may include PLMN information for the first device. The manner of selecting the relay by the second device may include at least one of:

selecting the first device as a relay of an access network under the condition that the PLMN information in the discovery message is in a PLMN network list of the second device, which allows the relay;

selecting the first device as a relay of the access network in the discovery message with specific information in the list of specific information of the second device that allows relaying data for devices of different PLMNs;

In addition, after receiving the authorization indication information, the second device may also store a PLMN network list that does not allow relaying, or store a list of specific information that does not allow relaying data for devices of different PLMNs. In this case, the method for the second device to select the relay may include:

under the condition that the PLMN information in the discovery message is in a PLMN network list of the second equipment, which does not allow relay, the first equipment is not selected as the relay of the access network;

in case the specific information in the discovery message is in a list of specific information of the second device that is not allowed to relay data for devices of a different PLMN, the first device is not selected as a relay of the access network.

For a specific example of the method 400 executed by the network device in this embodiment, reference may be made to the related description about the second device in the foregoing

methods

200 and 300, and details are not repeated here for brevity.

According to the embodiment of the application, other equipment can be indicated to select the relay according to the PLMN information through the relay selection information, so that the equipment can be accessed to the network through a proper relay. For example, the remote terminal can receive relay selection information from the relay terminal or a relay authorization indication from the network device, so that an appropriate relay access network can be selected according to the PLMN information.

In one exemplary scenario, in NCIS service, a terminal may transmit data using a relay (relay). As shown in fig. 5, in an architecture of a terminal-to-Network Relay (UE-to-Network Relay), a Remote terminal (Remote UE) and a Relay terminal (Relay UE) communicate with each other using a D2D technology, and an interface between the two UEs is a PC5 interface. The interface between the relay terminal and the network device, e.g. eNB, is Uu. The base station may communicate with a Public Safety Application Server (AS) through an Evolved Packet data Core (EPC), and a communication interface is an SGi interface. Before the remote terminal communicates with the network, the remote terminal needs to discover and select a relay terminal. For example, the manner in which the relay terminal and the remote terminal discover each other is classified into mode a (Model a) and mode B (Model B).

As shown in fig. 6, in Model a, UE-1 (Relay UE) broadcasts a Relay Service Code (RSC) and a notification message (notification message) that it supports. The notification message may include notification information (announcier Info). For example, the notification message includes an International Mobile Subscriber Identity (IMSI). If surrounding UEs (remote UEs), e.g., UE-2, UE-3, UE-4, or UE-5, also hold the same RSC, a PC5 connection can be established with UE-1.

As shown in fig. 7, in Model B, UE-1 (Remote UE) broadcasts a request message (Solicitation message), and a terminal receiving the request message sends a discovery message (discovery message). The RSC and discovery message (discovery message) that it needs to use is broadcast. Discovery information (discover Info) may be included in the discovery message, for example, the discovery information includes IMSI. UE1 is responded to if surrounding UEs (Relay UEs), e.g., UE-2, UE-3, UE-4 or UE-5, also hold the same RSC, i.e., can provide the service. For example, referring to steps 2a and 2b, UE-2 and UE-3 return Response messages (Response messages). UE-1 selects one from the plurality of responding UEs and establishes a PC5 connection.

When there are multiple Relay UEs satisfying the above conditions around a Relay UE, the Relay UE may select the Relay UE with the best signal quality.

In the embodiment of the application, the relay terminal can forward the system information of the network to the remote terminal, and the remote terminal can consider the content of the system information and the information of the relay terminal simultaneously in the process of selecting the relay terminal. The following are examples of several specific applications.

The first embodiment is as follows:

as shown in fig. 8, the PCF authorizing the relay terminal to indicate relay selection by using the system information may specifically include the following steps:

and step 801. The PCF authorizes the relay terminal. For example, the authorization indication information sent by the PCT to the relay terminal may include at least one of the following:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

Wherein, the specific information in the authorization indication information may include a specific group or a specific service. For example, for groups of public safety or services, data is allowed to be relayed for devices of different PLMNs.

The different PLMNs may include at least one of:

1) A serving PLMN with the relay terminal;

2) Different from the registered PLMN of the relay terminal;

3) Different from the HPLMN of the relay terminal;

4) Different from the relay terminal EHPLMN.

Step 802, the relay terminal reads the system information of the current cell.

Step 803, the relay terminal determines the content (determined the delayed SIB information) in the forwarded system information according to the authorization indication information in step 801.

According to the difference of the received authorization indication information, the content in the system information forwarded by the relay terminal to the remote terminal may also be different, and specific examples are as follows:

the first example is as follows: if the authorization indication information in step 801 includes permission to relay data for a remote terminal of a different PLMN, the relay terminal does not modify the supported PLMN information in the received system information.

Example two: if the authorization indication information in step 801 includes that data is not allowed to be relayed for a remote terminal of a different PLMN, the relay terminal does not forward the related information of the different PLMN in the system information. The information related to the PLMN includes, for example, access control information of the PLMN, cell blocking information, and the like.

Example three: if the authorization indication information in step 801 includes specific information (e.g., specific group and/or specific service) allowing relaying of data for devices of different PLMNs, the relay terminal includes specific information allowing and/or not allowing relaying of data for devices of different PLMNs in the forwarded system information.

Example four: if the authorization indication information in step 801 includes PLMN information for relay permission and/or relay non-permission, the relay terminal adjusts the PLMN information in the system information. The adjusted system information includes the relevant information of the allowed PLMN and/or the relevant information of the disallowed PLMN.

Further, the non-access stratum of the relay terminal submits the authorization indication information to the access stratum. The non-access stratum here may be a protocol layer that receives the authorization indication information.

And step 804, forwarding the system information (Relay SIB) determined in the last step.

Step 805, the remote terminal performs PLMN selection and registration process according to the system information received from the relay terminal, which includes the following specific examples:

example one: if the system information received by the remote terminal from the relay terminal in step 803 includes PLMN information of the remote terminal, for example, HPLMN information, RPLMN, current serving PLMN, etc., the remote terminal may select the relay terminal as a relay of the access network. Otherwise, the relay terminal is not selected as the relay of the access network.

Example two: if the PLMN information allowed for relaying included in the system information received by the remote terminal from the relay terminal in step 803 includes PLMN information of the remote terminal, the remote terminal may select the relay terminal as a relay of the access network. Otherwise, the relay terminal is not selected as the relay of the access network.

Example three: if the PLMN information of the remote terminal is included in the PLMN information which is not allowed to be relayed and is included in the system information received by the remote terminal from the relay terminal, the remote terminal does not select the relay terminal as the relay of the access network.

Example four: if the system information received by the remote terminal from the relay terminal in step 803 includes specific information, such as a specific group or a specific service, which allows relaying data for devices of different PLMNs, the remote terminal determines whether the group in which the remote terminal is located or the service to be initiated or the group in which the remote terminal is located belongs to a range in which relaying is allowed. The remote terminal may then select the relay terminal as a relay for the access network if allowed. If not, the remote terminal does not select the relay terminal as the relay of the access network.

Example five: if the system information received by the remote terminal from the relay terminal in step 803 includes specific information that does not allow relaying data for devices of different PLMNs, the remote terminal determines whether the group in which the remote terminal is located or the service to be initiated or the group in which the remote terminal is located belongs to a range in which relaying is not allowed. If yes, the remote terminal does not select the relay terminal as the relay of the access network.

Further, the access layer of the remote terminal submits the received system information to the non-access layer, and the non-access layer makes a judgment.

In this embodiment, the network can control whether to allow the relay data for different PLMNs, and further, control differently whether to allow the relay data for different groups/services.

Example two:

as shown in fig. 9, the PCF authorizes the relay terminal to use the system information and the discovery message to indicate relay selection, which may specifically include the following steps:

and step 901, authorizing the relay terminal by the PCF. For example, the PCT transmits authorization indication information to the relay terminal. The content included in the authorization indication information can be referred to the relevant description of the authorization indication information in step 801 in the embodiment of fig. 8.

Step 902, the relay terminal receives system information from the NG-RAN.

Step 903, the relay terminal forwards the received system information.

Step 904, the relay terminal sends a discovery message, wherein the discovery message carries at least one of the following information authorized in step 901, for example:

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

And step 905, after the remote terminal receives the system information and the discovery message forwarded by the relay terminal, determining whether to select the relay terminal to access the network according to the discovery message and the information in the system information. In particular, the method comprises the following steps of,

example one: if the PLMN information of the discovery message and the system information allowing relay includes PLMN information of the remote terminal, the remote terminal selects the relay terminal as a relay of the access network.

Example two: if the PLMN information of the discovery message and the system information which does not allow the relay comprises the PLMN information of the remote terminal, the remote terminal does not select the relay terminal as the relay of the access network.

Example three: if the PLMN information of the remote terminal is not included in the PLMN information allowing relay of the discovery message and the system information; and specific information, e.g. a specific group and/or a specific service, allowing relaying data for devices of different PLMNs is matched with the information of the remote terminal, the remote terminal selects this relay terminal as a relay of the access network.

Example death: if the PLMN information of the remote terminal is not included in the PLMN information allowing relay of the discovery message and the system information; and specific information, e.g. a specific group and/or a specific service, for relaying data for devices of different PLMNs is not allowed to match the information of the remote terminal, the remote terminal does not select this relay terminal as a relay of the access network.

Example five: if the discovery message does not carry any PLMN information, the remote terminal considers that the discovery message is not restricted, and selects a relay of the access network according to the PLMN information in the system information, see the related description of step 805 in the above embodiment.

In this embodiment, the network can control whether to allow relaying data for different PLMNs, and further control whether to allow relaying data for different groups/services differently.

Example three:

as shown in fig. 10, the PCF authorizes the remote terminal to select the relay, which may specifically include the following steps:

and step 1001, the PCF authorizes the remote terminal. For example, the PCT sends authorization indication information to the remote terminal. The content included in the authorization indication information can be referred to the relevant description of the authorization indication information in step 801 in the embodiment of fig. 8. After the relay authorization indication received by the remote terminal, the PLMN network list allowing relaying may be stored.

Step 1002, the relay terminal receives system information from the NG-RAN.

Step 1003, the relay terminal forwards the received system information.

And step 1004, the relay terminal sends a discovery message, wherein the discovery message carries the service PLMN information, the RPLMN information or the HPLMN information of the relay terminal.

And 1005, after the remote terminal receives the system information and the discovery message forwarded by the relay terminal, determining whether to select the relay terminal to access the network according to the information in the discovery message and the system information. Examples are as follows:

the first example is as follows: the PLMN information included in the discovery message is selected to access the network in the PLMN network list where the relay authorization indication received by the remote terminal allows relaying.

Example two: the PLMN information included in the discovery message is not selected to access the network in the PLMN network list where the relay authorization received by the remote terminal indicates that the relay is not allowed.

Example three: the PLMN information of the discovery message is in a list of specific information allowing relaying of data for devices of different PLMNs, then this relay terminal is selected to access the network.

Example four: if the discovery message does not carry any PLMN information, the remote terminal considers that the discovery message is not restricted, and selects a relay of the access network according to the PLMN information in the system information, see the related description of step 805 in the above embodiment.

In addition, the relay method in the embodiment of the application can be applied to not only a scenario that a remote terminal accesses a network through a relay terminal, but also a scenario that opposite-end UE is selected in D2D.

Fig. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. The communication device 1100 may include: a processing unit 1101 configured to send relay selection information instructing the second device to select a relay according to the public land mobile network PLMN information.

Optionally, in this embodiment of the present application, the processing unit 1101 is further configured to receive a relay authorization indication from a third device.

Optionally, in this embodiment of the present application, the third device is a policy control network element PCF.

Optionally, in an embodiment of the present application, the relay authorization indication includes at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.

Optionally, in this embodiment of the present application, the processing unit 1101 is further configured to receive first system information from a fourth device.

Optionally, in this embodiment of the present application, the fourth device is a base station.

Optionally, in this embodiment of the present application, the relay selection information includes second system information, where the second system information includes at least one of:

all PLMN information in the first system information;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

Optionally, in this embodiment of the present application, the relay selection information includes a discovery message.

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

PLMN information for a communication device, such as a first device.

Optionally, in this embodiment of the present application, the PLMN information of the communication device includes at least one of serving PLMN information of the communication device, registered RPLMN information and HPLMN information of the public land mobile network.

Optionally, in this embodiment, the specific information includes a specific group and/or a specific service.

The communication device 1100 of the embodiment of the present application is capable of implementing corresponding functions of the first device, for example, the relay device, in the foregoing method embodiments. For the corresponding processes, functions, implementation manners and beneficial effects of each module (sub-module, unit or component, etc.) in the communication device 1100, reference may be made to the corresponding description in the foregoing method embodiments, and details are not repeated here.

It should be noted that the functions described in relation to the respective modules (sub-modules, units, or components, etc.) in the communication device 1100 of the embodiment of the present application may be implemented by different modules (sub-modules, units, or components, etc.), or may be implemented by the same module (sub-modules, units, or components, etc.).

Fig. 12 is a schematic block diagram of a communication device 1200 according to another embodiment of the present application. The communication device 1200 may include: a sending unit 1201, configured to send a relay authorization indication.

Optionally, in this embodiment of the present application, the sending unit is a policy control network element PCF. The sending unit 1201 is further configured to perform at least one of the following steps:

transmitting a relay authorization indication to a first device;

and sending a relay authorization indication to the second device.

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

The communication device 1200 of the embodiment of the present application can implement the corresponding function of the third device, for example, PCF in the foregoing method embodiment. For the corresponding processes, functions, implementation manners and beneficial effects of each module (sub-module, unit or component, etc.) in the communication device 1200, reference may be made to the corresponding description in the foregoing method embodiments, and details are not repeated here.

It should be noted that the functions described in relation to the respective modules (sub-modules, units, or components, etc.) in the communication device 1200 of the embodiment of the present application may be implemented by different modules (sub-modules, units, or components, etc.), or may be implemented by the same module (sub-modules, units, or components, etc.).

Fig. 13 is a schematic block diagram of a communication device 1300 according to another embodiment of the present application. The communication device 1300 may include:

a receiving unit 1301, configured to receive relay selection information, where the relay selection information is used to instruct the second device to select a relay according to PLMN information of a public land mobile network;

a selecting unit 1302, configured to select a relay according to the PLMN information.

all PLMN information in a first system message received by first equipment from network equipment;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.

Optionally, in this embodiment of the present application, a manner of selecting a relay by the selecting unit 1302 includes one of:

selecting the first device as a relay for accessing the network in case the PLMN information of the communication device, e.g. the second device, is in the second system information;

selecting the first device as a relay of an access network under the condition that the PLMN information of the communication device is in the PLMN information allowing the relay;

under the condition that the PLMN information of the communication equipment is in the PLMN information which does not allow the relay, the first equipment is not selected as the relay of the access network;

selecting the first device as a relay for the access network in case the specific information of the communication device is among specific information allowing relaying data for devices of different PLMNs;

in case the specific information of the communication device is among the specific information not allowing relaying data for devices of different PLMNs, the first device is not selected as a relay of the access network.

Optionally, in this embodiment of the present application, the specific information of the communication device in the specific information that allows relaying data for devices of different PLMNs includes:

the group in which the communication device is located, the service to be initiated, or the group of services to be initiated is in specific information that allows relaying data for devices of different PLMNs.

Optionally, in this embodiment of the present application, the relay selection information includes a discovery message from the first device.

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

PLMN information of the first device.

Optionally, in this embodiment of the present application, a manner of selecting a relay by the selecting unit 1302 includes at least one of:

selecting the first device as a relay of the access network in case that the PLMN information of the communication device is in the second system information and the PLMN information allowing the relay in the discovery message;

under the condition that the PLMN information of the communication equipment is in the second system information and the PLMN information which does not allow relay in the discovery message, the first equipment is not selected as the relay of the access network;

in the case that the specific information of the communication device is in the second system information and the specific information of the discovery message allowing relaying of data for devices of different PLMNs, selecting the first device as a relay of the access network;

in the case that the specific information of the communication device does not allow relaying data for devices of different PLMNs in the second system information and the discovery message, not selecting the first device as a relay of the access network;

in case the discovery message does not include PLMN information, a relay of the access network is selected according to the second system information.

selecting the first device as a relay of an access network under the condition that the PLMN information in the discovery message is in a PLMN network list of the communication device, which allows the relay;

selecting the first device as a relay of the access network in case specific information in the discovery message is in a list of specific information of the communication device that allows relaying data for devices of different PLMNs;

Optionally, in this embodiment of the present application, the receiving unit 1301 is further configured to receive a relay authorization indication.

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

The communication device 1300 of the embodiment of the present application can implement the corresponding functions of the second device, for example, the remote terminal in the foregoing method embodiments. For the corresponding processes, functions, implementation manners, and beneficial effects of each module (sub-module, unit, or component, etc.) in the communication device 1300, reference may be made to the corresponding description in the foregoing method embodiment, and details are not repeated here. It should be noted that the functions described in relation to the respective modules (sub-modules, units, or components, etc.) in the communication device 1300 of the embodiment may be implemented by different modules (sub-modules, units, or components, etc.), or may be implemented by the same module (sub-modules, units, or components, etc.).

Fig. 14 is a schematic configuration diagram of a communication apparatus 600 according to an embodiment of the present application. The communication device 600 shown in fig. 14 includes a processor 610, and the processor 610 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. 14, the communication device 600 may further include a memory 620. From the memory 620, the processor 610 may call and run a computer program to implement the method in the embodiment of the present application.

The memory 620 may be a separate device from the processor 610, or may be integrated into the processor 610.

Optionally, as shown in fig. 14, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 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 630 may include a transmitter and a receiver, among others. The transceiver 630 may further include one or more antennas.

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

Fig. 15 is a schematic structural diagram of a chip 700 according to an embodiment of the present application. The chip 700 shown in fig. 15 includes a processor 710, and the processor 710 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. 15, the chip 700 may further include a memory 720. From the memory 720, the processor 710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 720 may be a separate device from the processor 710, or may be integrated into the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

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

Optionally, the chip may be applied to the first device, the second device, or the third device in this embodiment, and the chip may implement a corresponding process implemented by a network device in each method in this embodiment, which is not described herein again for brevity.

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, etc.

The processors referred to above may be general purpose processors, digital Signal Processors (DSPs), field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. The general-purpose processor mentioned above may be a microprocessor, or any conventional processor, etc.

The above-mentioned memories may be either volatile or nonvolatile memories, or may include both volatile and nonvolatile memories. 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. Volatile memory can be Random Access Memory (RAM).

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced 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.

Fig. 16 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. As shown in fig. 16, the communication system 800 includes a first device 810 and a second device 820. A first device 810 for transmitting relay selection information for instructing a second device to select a relay based on public land mobile network, PLMN, information. A second device 810 for receiving relay selection information for instructing the second device to select a relay according to public land mobile network PLMN information; and selecting a relay according to the PLMN information.

Wherein the first device 810 may be configured to implement the corresponding functions implemented by the first device, e.g., the relay device, in the above-described method, and the second device 820 may be configured to implement the corresponding functions implemented by the second device, e.g., the remote device, in the above-described method. For brevity, further description is omitted herein.

Optionally, the communication system may further include: a third device 830 configured to send a relay authorization indication. For example, the third device sends a relay authorization indication to the first device and/or the second device. The third device 830 may be configured to implement the corresponding functionality implemented by the third device, e.g., PCF, in the above-described method. For brevity, no further description is provided herein.

Optionally, the communication system may further include: a fourth device (not shown in the figure) for sending the first system information to the first device. The fourth device may be adapted to implement the corresponding functionality implemented by the fourth device, e.g. the base station, in the above-described method. For brevity, no further description is provided herein.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, including one or more integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply any order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments 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.

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

A relay method, comprising:

the first device sends relay selection information for instructing the second device to select a relay based on Public Land Mobile Network (PLMN) information.
The method of claim 1, wherein the method further comprises:

the first device receives a relay authorization indication from a third device.
The method of claim 2, wherein the third device is a policy control network element PCF.
The method of claim 3, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The method of claim 4, wherein the different PLMNs comprise at least one of:

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.
The method of any of claims 2 to 5, wherein the method further comprises:

the first device receives first system information from a fourth device.
The method of claim 6, wherein the fourth device is a base station.
The method of claim 6 or 7, wherein the relay selection information comprises second system information forwarded by the first device, the second system information comprising at least one of:

all PLMN information in the first system information;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The method of any of claims 1-8, wherein the relay selection information comprises a discovery message transmitted by the first device.
The method of claim 9, wherein the discovery message comprises at least one of:

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

disallowing relaying of data specific information for devices of different PLMNs;

PLMN information of the first device.
The method of claim 10, wherein the PLMN information for the first device comprises at least one of serving PLMN information, registered public land mobile network, RPLMN, information, and HPLMN information for the first device.
The method according to claim 4, 8 or 10, wherein the specific information comprises a specific group and/or a specific service.
A relay method, comprising:

the third device sends a relay authorization indication.
The method of claim 13, wherein the third device is a policy control network element PCF, and wherein the third device sends a relay authorization indication, comprising at least one of:

the PCF sends a relay authorization indication to the first equipment;

the PCF sends a relay authorization indication to the second device.
The method of claim 13 or 14, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The method of claim 15, wherein the specific information comprises a specific group and/or a specific service.
A relay method, comprising:

the second equipment receives relay selection information, wherein the relay selection information is used for instructing the second equipment to select a relay according to PLMN information of a public land mobile network;

and the second equipment selects a relay according to the PLMN information.
The method of claim 17, wherein the relay selection information comprises second system information from the first device, the second system information comprising at least one of:

all PLMN information in a first system message received by a first device from a network device;

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The method of claim 18, wherein the specific information includes a specific group and/or a specific service.
The method of claim 18 or 19, wherein the different PLMNs comprise at least one of:

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.
The method of any of claims 18 to 20, wherein the manner in which the second device selects a relay comprises one of:

the second device selects the first device as a relay of an access network if the PLMN information of the second device is in the second system information;

the second device selects the first device as a relay of an access network under the condition that the PLMN information of the second device is in the PLMN information allowing the relay;

under the condition that the PLMN information of the second equipment is in the PLMN information which does not allow the relay, the second equipment does not select the first equipment as the relay of the access network;

in the event that the specific information for the second device is in specific information that allows relaying data for devices of different PLMNs, the second device selects the first device as a relay of an access network;

in a case that the specific information of the second device is in specific information that does not allow relaying data for devices of different PLMNs, the second device does not select the first device as a relay of the access network.
The method of claim 21, wherein the specific information of the second device in the case of specific information allowing relaying of data for devices of different PLMNs comprises:

the group in which the second device is located, the service to be initiated, or the group of services to be initiated is in specific information that allows relaying data for devices of different PLMNs.
The method of any of claims 18 to 20, wherein the relay selection information comprises a discovery message from a first device.
The method of claim 23, wherein the discovery message comprises at least one of:

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

disallowing relaying of data specific information for devices of different PLMNs;

PLMN information of the first device.
The method of claim 24, wherein the manner in which the second device selects a relay comprises at least one of:

selecting the first device as a relay of an access network under the condition that the PLMN information of the second device is in second system information and PLMN information allowing relay in the discovery message;

not selecting the first device as a relay of an access network if the PLMN information of the second device is in second system information and PLMN information in the discovery message that does not allow relaying;

in the case that the specific information of the second device allows relaying data for devices of different PLMNs in the second system information and the discovery message, the second device selects the first device as a relay of the access network;

in the case that the specific information of the second device does not allow relaying data for devices of different PLMNs in the second system information and the discovery message, the second device does not select the first device as a relay of the access network;

selecting a relay of an access network according to the second system information if the discovery message does not include PLMN information.
The method of claim 22, wherein the PLMN information for the first device comprises at least one of serving PLMN information, registered public land mobile network, RPLMN, information, and HPLMN information for the first device.
The method of claim 24, wherein the manner in which the second device selects a relay comprises at least one of:

selecting the first device as a relay of an access network if the PLMN information in the discovery message is in a PLMN network list of the second device that allows relaying;

selecting the first device as a relay of an access network in case specific information in the discovery message is in a list of specific information of the second device that allows relaying data for devices of different PLMNs;

selecting a relay of an access network according to the second system information if the discovery message does not include PLMN information.
The method of any of claims 25 to 27, wherein the method further comprises:

the second device receives a relay authorization indication.
The method of claim 28, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
A communication device, comprising:

a processing unit for sending relay selection information for instructing the second device to select a relay based on the public land mobile network, PLMN, information.
The communications device of claim 30, wherein the processing unit is further configured to receive a relay authorization indication from a third device.
The communications device of claim 31, wherein the third device is a policy control network element PCF.
The communication device of claim 32, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The communication device of claim 33, wherein the different PLMNs comprise at least one of:

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.
The communication device of any of claims 31-34, wherein the processing unit is further configured to receive first system information from a fourth device.
The communications device of claim 35, wherein the fourth device is a base station.
The communication device of claim 35 or 36, wherein the relay selection information comprises second system information comprising at least one of:

all PLMN information in the first system information;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The communication device of any of claims 30 to 37, wherein the relay selection information comprises a discovery message.
The communication device of claim 38, wherein the discovery message comprises at least one of:

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

not allowing specific information of relaying data for devices of different PLMNs;

PLMN information of the communication device.
The communication device of claim 39, wherein the PLMN information of the communication device comprises at least one of serving PLMN information, registered Public Land Mobile Network (RPLMN) information, and HPLMN information of the communication device.
The communication device of claim 33, 37 or 39, wherein the specific information comprises a specific group and/or a specific service.
A communication device, comprising:

a sending unit, configured to send a relay authorization indication.
The communications device of claim 42, wherein the communications device is a policy control network element PCF, and wherein the sending unit is further configured to perform at least one of:

transmitting a relay authorization indication to a first device;

and sending a relay authorization indication to the second device.
The communication device of claim 42 or 43, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The communication device of claim 44, wherein the specific information comprises a specific group and/or a specific service.
A communication device, comprising:

a receiving unit, configured to receive relay selection information, where the relay selection information is used to instruct a second device to select a relay according to PLMN information of a public land mobile network;

and the selecting unit is used for selecting the relay according to the PLMN information.
The communication device of claim 46, wherein the relay selection information comprises second system information from the first device, the second system information comprising at least one of:

all PLMN information in a first system message received by a first device from a network device;

PLMN information to allow relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
The communication device of claim 47, wherein the specific information comprises a specific group and/or a specific service.
The communication device of claim 47 or 48, wherein different PLMNs comprise at least one of:

different serving PLMNs;

different registered PLMNs;

a different HPLMN;

a different EHPLMN.
The communication device of any one of claims 47 to 49, wherein the manner in which the selection unit selects a relay comprises one of:

selecting the first device as a relay for accessing a network if the PLMN information of the communication device is in the second system information;

selecting the first device as a relay of an access network if the PLMN information of the communication device is among the PLMN information that allows relaying;

not selecting the first device as a relay of an access network if the PLMN information of the communication device is in PLMN information that does not allow relaying;

selecting the first device as a relay for accessing a network in case the specific information of the communication device is among specific information allowing relaying of data for devices of different PLMNs;

in the event that the specific information for the communication device is among specific information that does not allow relaying data for devices of different PLMNs, not selecting the first device as a relay of an access network.
The communication device of claim 50, wherein the specific information of the communication device in the case of specific information allowing relaying of data for devices of different PLMNs comprises:

the group in which the communication device is located, the service to be initiated or the group of services to be initiated is in specific information allowing relaying of data for devices of different PLMNs.
The communication device of any one of claims 47 to 49, wherein the relay selection information comprises a discovery message from a first device.
The communication device of claim 52, wherein the discovery message comprises at least one of:

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

disallowing relaying of data specific information for devices of different PLMNs;

PLMN information of the first device.
The communication device of claim 53, wherein the manner in which the communication device selects a relay comprises at least one of:

selecting the first device as a relay of an access network in case that the PLMN information of the communication device is in second system information and PLMN information allowing relaying in the discovery message;

in the case that the PLMN information of the communication device is in the second system information and PLMN information in which relaying is not allowed in the discovery message, not selecting the first device as a relay of the access network;

selecting the first device as a relay of an access network in case the specific information of the communication device allows relaying data for devices of different PLMNs in the second system information and the discovery message;

in the event that the specific information of the communication device does not allow relaying of data for devices of different PLMNs in the second system information and the discovery message, not selecting the first device as a relay of the access network;

and under the condition that the discovery message does not comprise PLMN information, selecting a relay of an access network according to the second system information.
The communications device of claim 51, wherein the PLMN information of the first device comprises at least one of serving PLMN information, registered Public Land Mobile Network (RPLMN) information, and high cost local network (HPLMN) information of the first device.
The communication device of claim 53, wherein the means for selecting a relay comprises at least one of:

selecting the first device as a relay of an access network if the PLMN information in the discovery message is in a PLMN network list of the communication device that allows relaying;

selecting the first device as a relay of an access network in case specific information in the discovery message is in a list of specific information of the communication device that allows relaying data for devices of different PLMNs;

and under the condition that the discovery message does not comprise PLMN information, selecting a relay of an access network according to the second system information.
The communication device of any of claims 54-56, wherein the receiving unit is further configured to receive a relay authorization indication.
The communication device of claim 57, wherein the relay authorization indication comprises at least one of:

whether to allow relaying of data for devices of different PLMNs;

PLMN information allowed for relaying;

PLMN information not allowed for relaying;

specific information allowing relaying of data for devices of different PLMNs;

no specific information is allowed to relay data for devices of different PLMNs.
A communication 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 12.
A communication 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 13 to 16.
A communication 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 17 to 29.
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 12.
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 13 to 16.
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 17 to 29.
A computer-readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 12.
A computer-readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 13 to 16.
A computer-readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 17 to 29.
A computer program product comprising computer program instructions to cause a computer to perform the method of any one of claims 1 to 12.
A computer program product comprising computer program instructions to cause a computer to perform the method of any one of claims 13 to 16.
A computer program product comprising computer program instructions to cause a computer to perform the method of any of claims 17 to 29.
A computer program for causing a computer to perform the method of any one of claims 1 to 12.
A computer program for causing a computer to perform the method of any one of claims 13 to 16.
A computer program for causing a computer to perform the method of any one of claims 17 to 29.