Method and device for obtaining system messages, terminal equipment, and network equipment

Abstract

An embodiment of the present application provides a method and apparatus, terminal equipment, and network equipment for obtaining system messages, the method comprising: a remote terminal receives a first message sent by a relay terminal, the first message carries a system message of a service cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of mobile communication technology, and specifically to a method and apparatus for obtaining system messages, a terminal device, and a network device. Background Art

[0002] The remote terminal is connected to the wireless network node through one or more relay terminals. The relay terminal directly connected to the wireless network node communicates with the wireless network node through the Uu interface of the 3rd Generation Partnership Project (3GPP) system. For example, the relay terminal can receive system messages sent by the wireless network node through the Uu interface. However, the remote terminal also needs to obtain system messages, and it needs to be clarified how the remote terminal obtains system messages. Summary of the invention

[0003] The embodiments of the present application provide a method and apparatus for obtaining system messages, a terminal device, and a network device.

[0004] The method for obtaining system information provided by the embodiment of the present application includes:

[0005] The remote terminal receives a first message sent by the relay terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0006] The method for obtaining system information provided by the embodiment of the present application includes:

[0007] The relay terminal sends a first message to the remote terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0008] The device for obtaining system information provided in the embodiment of the present application is applied to a remote terminal, and the device includes:

[0009] The receiving unit is used to receive a first message sent by a relay terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message or a discovery announcement message or a first unicast message.

[0010] The device for obtaining system information provided in the embodiment of the present application is applied to a relay terminal, and the device includes:

[0011] The sending unit is used to send a first message to a remote terminal, where the first message carries a system message of a service cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0012] The terminal device provided in the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned method for obtaining system messages.

[0013] The network device provided in the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned method for obtaining system messages.

[0014] The chip provided in the embodiment of the present application is used to implement the above-mentioned method for obtaining system messages.

[0015] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned method for obtaining system messages.

[0016] The computer-readable storage medium provided in the embodiment of the present application is used to store a computer program, which enables a computer to execute the above-mentioned method for obtaining system messages.

[0017] The computer program product provided in the embodiment of the present application includes computer program instructions, which enable a computer to execute the above-mentioned method for obtaining system messages.

[0018] The computer program provided in the embodiment of the present application, when executed on a computer, enables the computer to execute the above-mentioned method for obtaining system messages.

[0019] Through the above technical solution, the relay terminal sends the system message of the service cell of the relay terminal to the remote terminal through a discovery response message, a discovery announcement message or a first unicast message, so that the remote terminal can obtain the system message of the service cell of the relay terminal and meet the business needs of the remote terminal in the service cell of the relay terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

[0022] Figure 2 It is a flowchart of a method for obtaining system messages provided in an embodiment of the present application;

[0023] Figure 3The structure of the device for obtaining system information provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0024] Figure 4 The structure of the device for obtaining system information provided in the embodiment of the present application is shown in FIG. Figure 2 ;

[0025] Figure 5 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a chip according to an embodiment of the present application;

[0027] Figure 7 It is a schematic block diagram of a communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, 5G communication system or future communication system, etc.

[0030] For example, the communication system 100 used in the embodiment of the present application is as follows: Figure 1 As shown. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal 120 (or referred to as a communication terminal, terminal). The network device 110 may provide communication coverage for a specific geographical area, and may communicate with terminals located within the coverage area. Optionally, the network device 110 may be an evolved base station (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future communication system, etc.

[0031] The communication system 100 also includes at least one terminal 120 located within the coverage of the network device 110. As used herein, "terminal" includes but is not limited to connecting via a wired line, such as via a Public Switched Telephone Networks (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as, for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or another terminal configured to receive / send communication signals; and / or an Internet of Things (IoT) device. A terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications System (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communications capabilities; PDAs that may include radiotelephones, pagers, Internet / Intranet access, Web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A terminal may refer to an access terminal, User Equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a 5G network, or a terminal in a future evolved PLMN, etc.

[0032] Optionally, the terminals 120 may perform device-to-device (D2D) communication with each other.

[0033] Optionally, the 5G communication system or 5G network may also be referred to as a New Radio (NR) system or NR network.

[0034] Figure 1 One network device and two terminals are shown exemplarily. Optionally, the communication system 100 may include multiple network devices and each network device may include another number of terminals within its coverage area, which is not limited in the embodiments of the present application.

[0035] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0036] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be referred to as a communication device. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal 120 with communication functions. The network device 110 and the terminal 120 may be the specific devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0037] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the embodiments of the present application are described below.

[0039] The remote terminal is connected to the wireless network node through one or more relay terminals. The remote terminal and the relay terminal or the relay terminal and the relay terminal are connected and communicated through the PC5 interface of the 3GPP system, and the relay terminal directly connected to the wireless network node is connected and communicated with the wireless network node through the Uu interface of the 3GPP system.

[0040] The remote terminal discovers and selects the relay terminal through mode A or mode B. In mode A, the relay terminal will periodically broadcast a discovery announcement message, which contains information related to the discovery process (referred to as discovery process related information), such as the user ID of the relay terminal at the application layer, the application service ID, etc.; in addition, the discovery announcement message also contains the sending period information of the discovery announcement message. In mode B, the remote terminal will send a discovery request message, which contains information related to the discovery process, such as the user ID of the remote terminal at the application layer, the application service ID, etc.; if the relay terminal is authorized to respond to the remote terminal, it will send a discovery response message to the remote terminal.

[0041] It should be noted that the remote terminal in the embodiment of the present application may also be referred to as a "remote UE", and the relay terminal in the embodiment of the present application may also be referred to as a "relay UE".

[0042] Figure 2 is a flow chart of a method for obtaining system messages provided in an embodiment of the present application, such as Figure 2 As shown, the method for obtaining system messages includes the following steps:

[0043] Step 201: A remote terminal receives a first message sent by a relay terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0044] In the embodiment of the present application, the relay terminal sends a first message to the remote terminal, and correspondingly, the remote terminal receives the first message sent by the relay terminal. Here, the first message carries the system information of the serving cell of the relay terminal.

[0045] In one example, the relay terminal receives a system message sent by a serving cell through a Uu interface; the relay terminal sends a first message to the relay terminal through a PC5 interface, where the first message carries the system message.

[0046] In an optional manner, the system message includes at least one of the following: system information block (SIB) 1, SIB12, SIB13, SIB14.

[0047] In the embodiment of the present application, the first message is a discovery response message or a discovery announcement message or a first unicast message. The technical solution of the embodiment of the present application is described in detail below in combination with different implementations of the first message.

[0048] ●The first message is a discovery response message, the discovery response message carries a first container, and the first container is used to carry the system message.

[0049] Specifically, 1. The remote terminal sends a discovery request message to the relay terminal, and correspondingly, the relay terminal receives the discovery request message sent by the remote terminal, the discovery request message carries information related to the discovery process of the remote terminal, and the information related to the discovery process of the remote terminal includes at least one of the following: the user identifier of the remote terminal at the application layer, and the application service identifier of the remote terminal. 2. The remote terminal receives a discovery response message sent by the relay terminal, the discovery response message carries a first container, and the first container is used to carry the system message.

[0050] ●The first message is a discovery announcement message, the discovery announcement message carries a second container, and the second container is used to carry the system message.

[0051] Specifically, the remote terminal receives a discovery announcement message periodically sent by the relay terminal, where the discovery announcement message carries a second container, and the second container is used to carry the system message.

[0052] In an optional manner, the discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

[0053] In an optional manner, the discovery announcement message also carries a sending period of the discovery announcement message.

[0054] In an embodiment of the present application, the discovery announcement message is carried on a physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH), and the physical sidelink control channel (Physical Sidelink Control Channel, PSCCH) associated with the PSSCH carries sidelink control information (Sidelink Control Information, SCI). Optionally, the SCI includes at least one of the following identifiers:

[0055] A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message;

[0056] A target identifier, wherein the target identifier is associated with at least one application service;

[0057] An update flag is used to indicate whether the content in the discovery announcement message is updated.

[0058] In the embodiment of the present application, the discovery announcement message includes discovery process related information and system messages, and the update identifier is used to indicate whether the discovery process related information and / or system messages in the discovery announcement message are updated.

[0059] In an optional manner, the discovery process related information and the system information in the discovery announcement message share an update flag. In this case, the update flag is used to indicate whether at least one of the system information and the discovery process related information in the discovery announcement message is updated.

[0060] In another optional manner, the discovery process related information and the system message in the discovery announcement message each have an independent update identifier. In this case, the update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system message in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

[0061] A) In an optional manner, when the remote terminal receives the discovery announcement message for the first time, the remote terminal decodes the discovery announcement message carried on the PSSCH.

[0062] B) In an optional manner, when the remote terminal does not receive the discovery announcement message for the first time, if the remote terminal determines according to the SCI that the source identifier and the target identifier have not changed, the remote terminal determines whether the content in the discovery announcement message is updated according to the update identifier in the SCI;

[0063] If it is determined that the content in the discovery announcement message is not updated, the remote terminal does not decode the PSSCH carrying the discovery announcement message; or,

[0064] If it is determined that the content in the discovery announcement message is updated, the remote terminal decodes the PSSCH carrying the discovery announcement message and obtains the updated content in the discovery announcement message.

[0065] C) In an optional manner, when the remote terminal does not receive the discovery announcement message for the first time, if the remote terminal determines that the source identifier and / or the target identifier has changed based on the SCI, the remote terminal decodes the PSSCH carrying the discovery announcement message and obtains an updated discovery announcement message.

[0066] In one example, the discovery announcement message is sent from the relay terminal to the remote terminal via the PSSCH on the PC5 interface. The physical layer control channel accompanying the PSSCH is the PSCCH. Among them, the SCI contained in the PSCCH indicates how to correctly receive the relevant control information of the PSSCH, such as the time-frequency domain resource information of the PSSCH. In addition, the SCI also includes a source identifier, a target identifier and an update identifier, wherein the source identifier is used to indicate the terminal identifier that sends the discovery announcement message, the target identifier has an association relationship with the application service, and the update identifier is used to indicate whether the content in the discovery announcement message carried in the PSSCH is updated. When at least one of the discovery process related information and the system message contained in the discovery announcement message is updated, the update identifier in the SCI will also change. Among them, the discovery process related information and the system message can share an update identifier or each has an independent update identifier. The update identifier can be a relative marking method, that is, each time the content in the discovery announcement message is updated, the update identifier will flip, such as flipping from 0 to 1 or from 1 to 0. The update identifier can also be identified by an absolute value, for example, the update identifier is the serial number of the content. When the remote terminal receives the discovery announcement message:

[0067] 1. If the remote terminal is authorized to receive the discovery announcement message, and it is determined through the SCI that it is the first time to receive the discovery announcement message containing the target identifier, the remote terminal will attempt to receive and decode the PSSCH associated with the SCI and obtain the discovery announcement message from the PSSCH.

[0068] 2. If the remote terminal is interested in the application service indicated by the discovery announcement message and the measured radio signaling quality of the PSSCH is greater than a specific threshold, the remote terminal will select the relay terminal that sent the discovery announcement message.

[0069] 3. After selecting the relay terminal, the remote terminal will decide whether to periodically receive the discovery announcement message based on the source identifier, target identifier and update identifier contained in the SCI.

[0070] 4. Under the premise that the source identifier and the target identifier included in the SCI remain unchanged, if the update identifier does not change, the remote terminal will not decode the PSSCH. It should be noted that the remote terminal may measure the wireless signal strength of the PSSCH.

[0071] 5. Under the premise that the source identifier and the target identifier contained in the SCI remain unchanged, if the update identifier changes, the remote terminal will receive and decode the PSSCH and obtain the updated discovery announcement message from the PSSCH.

[0072] 6. When at least one of the source identifier and the target identifier included in the SCI changes, the remote terminal receives and decodes the PSSCH and obtains an updated discovery announcement message from the PSSCH.

[0073] ●The first message is a first unicast message, the first unicast message carries a third container, and the third container is used to carry the system message.

[0074] Specifically, the relay terminal receives the system message sent by the serving cell through the Uu interface; the relay terminal and the remote terminal establish a PC5 link, and sends a first unicast message to the remote terminal through the PC5 interface corresponding to the PC5 link, wherein the first unicast message carries the system message.

[0075] In an optional manner, the relay terminal receives the updated system message sent by the serving cell through the Uu interface, and sends a second unicast message to the remote terminal through the PC5 interface corresponding to the PC5 link, wherein the second unicast message carries the updated system message. Optionally, the second unicast message carries a fourth container, and the fourth container is used to carry the updated system message.

[0076] In another optional manner, the relay terminal receives the updated system message sent by the serving cell through the Uu interface; the relay terminal and the remote terminal establish a temporary PC5 link, and send a second unicast message to the remote terminal through the PC5 interface corresponding to the temporary PC5 link, wherein the second unicast message carries the updated system message. Optionally, the second unicast message carries a fourth container, and the fourth container is used to carry the updated system message.

[0077] The following is an example of the technical solution of the embodiment of the present application, which is illustrated in conjunction with a specific application example. The following application example is an example of a system message SIB1, but is not limited to this. The system message can also be other SIBs, such as SIB12, SIB13, SIB14, etc. related to PC5 interface communication.

[0078] Application example 1: Discovery mode B, the relay terminal sends a system message via a discovery response message.

[0079] 1. The relay terminal resides in a cell (i.e., the serving cell) and obtains the SIB1 of the serving cell through the Uu interface.

[0080] 2. The upper layer of the remote terminal triggers the discovery relay process, so the remote terminal sends a discovery request message, which includes the user identifier and application service identifier of the remote terminal at the application layer.

[0081] 3. After checking the discovery request message, if the relay terminal is authorized to respond to the discovery request message, it sends a discovery response message to the remote terminal, wherein the discovery response message includes SIB1.

[0082] Here, SIB1 is carried in the discovery response message as a container in the form of a byte stream that has been encoded by the Uu interface.

[0083] 4. The remote terminal receives the discovery response message and obtains SIB1 from the discovery response message.

[0084] Here, the remote terminal can determine whether to allow initiating a call in the serving cell of the relay terminal according to SIB1.

[0085] Application example 2: Discovery mode A, the relay terminal sends a system message through a discovery announcement message.

[0086] 1. The relay terminal resides in a cell (i.e., the serving cell) and obtains the SIB1 of the serving cell through the Uu interface.

[0087] 2. The high layer of the relay terminal triggers the discovery relay process, so the relay terminal starts to periodically send a discovery announcement message, which contains SIB1.

[0088] Here, SIB1 is carried in the discovery announcement message as a container in the form of a byte stream that has been encoded on the Uu interface.

[0089] Furthermore, the discovery announcement message also includes the sending period of the discovery announcement message. The discovery announcement message is sent via PSSCH, wherein the PSCCH associated with the PSSCH carries SCI, and the SCI includes a source identifier, a target identifier, and an update identifier, wherein the update identifier is used to indicate whether the system message is updated (for example, the update identifier is 0).

[0090] 3. The upper layer of the remote terminal triggers the discovery relay process, and then starts to receive the discovery announcement message sent by the surrounding relay terminals. After receiving the SCI, the remote terminal finds that it is the first time to receive the discovery announcement message based on the SCI, so it starts to decode the discovery announcement message carried on the PSSCH and save its content.

[0091] Application example three: Discovery mode A, the relay terminal updates the system message through the discovery announcement message.

[0092] 1. The relay terminal resides in a cell (i.e., the serving cell) and obtains the SIB1 of the serving cell through the Uu interface.

[0093] 2. The high layer of the relay terminal triggers the discovery relay process, so the relay terminal starts to periodically send a discovery announcement message, which contains SIB1.

[0094] Here, SIB1 is carried in the discovery announcement message as a container in the form of a byte stream that has been encoded on the Uu interface.

[0095] Furthermore, the discovery announcement message also includes the sending period of the discovery announcement message. The discovery announcement message is sent via PSSCH, wherein the PSCCH associated with the PSSCH carries SCI, and the SCI includes a source identifier, a target identifier, and an update identifier, wherein the update identifier is used to indicate whether the system message is updated (for example, the update identifier is 0).

[0096] 3. When the remote terminal receives the discovery announcement message again after a sending cycle, and the target identifier, source identifier and update identifier in the SCI associated with the discovery announcement message have not changed, the remote terminal chooses to ignore the discovery announcement message.

[0097] 4. After a period of time, the relay terminal updates the SIB1 of the Uu interface. Therefore, the relay terminal includes the updated SIB1 in the discovery announcement message broadcast periodically, and modifies the update flag on the SCI (for example, to 1).

[0098] 5. After the remote terminal receives the updated SCI of the discovery announcement message, the remote terminal learns that the update flag in the SCI is changed to 1, and then starts decoding the discovery announcement message carried on the PSSCH channel, and saves the updated SIB1 in the discovery announcement message.

[0099] Application example 4: Discovery mode A, the relay terminal sends information related to the discovery process through a discovery announcement message.

[0100] 1. The high layer of the relay terminal triggers the discovery relay process, so the relay terminal starts to periodically send a discovery announcement message, which contains the user identifier and application service identifier of the relay terminal at the application layer.

[0101] Furthermore, the discovery announcement message also includes the sending period of the discovery announcement message. The discovery announcement message is sent via PSSCH, wherein the PSCCH associated with the PSSCH carries SCI, and the SCI includes a source identifier, a target identifier, and an update identifier, wherein the update identifier is used to indicate whether the information related to the discovery process is updated (for example, the update identifier is 2).

[0102] 2. The upper layer of the remote terminal triggers the discovery relay process, and then starts to receive the discovery announcement message sent by the surrounding relay terminals. After receiving the SCI, the remote terminal finds that it is the first time to receive the discovery announcement message based on the SCI, so it starts to decode the discovery announcement message carried on the PSSCH and selects the relay terminal as its own relay.

[0103] Application Example 5: Discovery Mode A, the relay terminal updates the information related to the discovery process through the discovery announcement message.

[0104] 1. The high layer of the relay terminal triggers the discovery relay process, so the relay terminal starts to periodically send a discovery announcement message, which contains the user identifier and application service identifier of the relay terminal at the application layer.

[0105] Furthermore, the discovery announcement message also includes the sending period of the discovery announcement message. The discovery announcement message is sent via PSSCH, wherein the PSCCH associated with the PSSCH carries SCI, and the SCI includes a source identifier, a target identifier, and an update identifier, wherein the update identifier is used to indicate whether the information related to the discovery process is updated (for example, the update identifier is 2).

[0106] 2. After a period of time, the relay terminal updates the application service identifier after contacting the network, and thus modifies the update identifier in the SCI (for example, to 3).

[0107] 3. After the remote terminal receives the SCI of the updated discovery announcement message, the remote terminal learns that the update flag in the SCI is changed to 3, and then starts decoding the discovery announcement message carried on the PSSCH channel and saves the updated content in the discovery announcement message.

[0108] Application example six: The relay terminal sends system messages and updates system messages through unicast messages.

[0109] 1. The relay terminal resides in a cell (i.e., the serving cell) and obtains the SIB1 of the serving cell through the Uu interface.

[0110] 2. The relay terminal sends SIB1 to the remote terminal via the PC5 interface in a unicast message.

[0111] Here, SIB1 is carried in a unicast message as a container in the form of a byte stream that has been encoded on the Uu interface.

[0112] Here, when the relay terminal establishes a PC5 link with the remote terminal for the first time, the relay terminal sends a unicast message carrying SIB1 to the remote terminal through the PC5 interface corresponding to the PC5 link.

[0113] 3. When the SIB1 of the Uu interface is updated, the relay terminal sends a unicast message carrying the updated SIB1 to the remote terminal through the PC5 interface corresponding to the previously established PC5 link. Alternatively, when the SIB1 of the Uu interface is updated, the relay terminal establishes a temporary PC5 link with the remote terminal, and sends a unicast message carrying the updated SIB1 to the remote terminal through the PC5 interface corresponding to the temporary PC5 link.

[0114] The technical solution of the embodiment of the present application includes the system message of the Uu interface in the discovery announcement message or the discovery response message or the unicast message, which can save the sending of broadcast messages, save wireless resources and terminal power consumption. On the other hand, the update mechanism of the discovery announcement message can allow the remote terminal to avoid receiving and decoding redundant PSSCH as much as possible, thereby achieving the purpose of power saving.

[0115] Figure 3 The structure of the device for obtaining system information provided in the embodiment of the present application is shown in FIG. Figure 1 , applied to remote terminals, such as Figure 3 As shown, the device for obtaining system information includes:

[0116] The receiving unit 301 is configured to receive a first message sent by a relay terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0117] In an optional manner, the first message is a discovery response message,

[0118] The discovery response message carries a first container, where the first container is used to carry the system message.

[0119] In an optional manner, the device further includes:

[0120] The sending unit 302 is used to send a discovery request message to the relay terminal, and the discovery request message carries information related to the discovery process of the remote terminal. The information related to the discovery process of the remote terminal includes at least one of the following: the user identifier of the remote terminal at the application layer, and the application service identifier of the remote terminal.

[0121] In an optional manner, the first message is a discovery announcement message, the discovery announcement message carries a second container, and the second container is used to carry the system message.

[0122] In an optional manner, the discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

[0123] In an optional manner, the discovery announcement message also carries a sending period of the discovery announcement message.

[0124] In an optional manner, the discovery announcement message is carried on the PSSCH, and the PSCCH associated with the PSSCH carries the SCI, and the SCI includes at least one of the following identifiers:

[0125] A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message;

[0126] A target identifier, wherein the target identifier is associated with at least one application service;

[0127] An update flag is used to indicate whether the content in the discovery announcement message is updated.

[0128] In an optional manner, the update flag is used to indicate whether at least one of the system message and the discovery process related information in the discovery announcement message is updated; or,

[0129] The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

[0130] In an optional manner, the device further includes:

[0131] The processing unit 303 is configured to decode the discovery announcement message carried on the PSSCH when the discovery announcement message is received for the first time.

[0132] In an optional manner, the device further includes:

[0133] The processing unit 303 is used to determine whether the content of the discovery announcement message is updated according to the update identifier in the SCI when it is not the first time that the discovery announcement message is received. If it is determined that the source identifier and the target identifier have not changed according to the SCI, if the discovery announcement message is not received for the first time, then the processing unit 303 is used to determine whether the content of the discovery announcement message is updated according to the update identifier in the SCI; if it is determined that the content of the discovery announcement message is not updated, then the PSSCH carrying the discovery announcement message is not decoded; or, if it is determined that the content of the discovery announcement message is updated, then the PSSCH carrying the discovery announcement message is decoded and the updated content in the discovery announcement message is obtained.

[0134] In an optional manner, the device further includes:

[0135] The processing unit 303 is configured to decode the PSSCH carrying the discovery announcement message and obtain an updated discovery announcement message if it is determined according to the SCI that the source identifier and / or the target identifier has changed.

[0136] In an optional manner, the first message is a first unicast message.

[0137] The first unicast message carries a third container, and the third container is used to carry the system message.

[0138] In an optional manner, the system message includes at least one of the following: SIB1, SIB12, SIB13, SIB14.

[0139] Those skilled in the art should understand that the relevant description of the above-mentioned device for obtaining system messages in the embodiment of the present application can be understood by referring to the relevant description of the method for obtaining system messages in the embodiment of the present application.

[0140] Figure 4 The structure of the device for obtaining system information provided in the embodiment of the present application is shown in FIG. Figure 2 , applied to relay terminals, such as Figure 4 As shown, the device for obtaining system information includes:

[0141] The sending unit 401 is configured to send a first message to a remote terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery response message, a discovery announcement message, or a first unicast message.

[0142] In an optional manner, when the first message is a discovery response message,

[0143] The discovery response message carries a first container, where the first container is used to carry the system message.

[0144] In an optional manner, the device further includes:

[0145] The receiving unit 402 is used to receive a discovery request message sent by the remote terminal, wherein the discovery request message carries information related to the discovery process of the remote terminal, and the information related to the discovery process of the remote terminal includes at least one of the following: the user identifier of the remote terminal at the application layer, and the application service identifier of the remote terminal.

[0146] In an optional manner, the first message is a discovery announcement message, the discovery announcement message carries a second container, and the second container is used to carry the system message.

[0147] In an optional manner, the discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

[0148] In an optional manner, the discovery announcement message also carries a sending period of the discovery announcement message.

[0149] In an optional manner, the discovery announcement message is carried on the PSSCH, and the PSCCH associated with the PSSCH carries the SCI, and the SCI includes at least one of the following identifiers:

[0150] A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message;

[0151] A target identifier, wherein the target identifier is associated with at least one application service;

[0152] An update flag is used to indicate whether the content in the discovery announcement message is updated.

[0153] In an optional manner, the update flag is used to indicate whether the system message and / or the discovery process related information in the discovery announcement message are updated; or,

[0154] The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

[0155] In an optional manner, the first message is a first unicast message.

[0156] The first unicast message carries a third container, and the third container is used to carry the system message.

[0157] In an optional manner, the device further includes:

[0158] A receiving unit 402, configured to receive a system message sent by the serving cell through a Uu interface;

[0159] An establishing unit (not shown in the figure), used to establish a PC5 link with the remote terminal;

[0160] The sending unit 401 is configured to send a first unicast message to the remote terminal through the PC5 interface corresponding to the PC5 link, where the first unicast message carries the system message.

[0161] In an optional manner, the receiving unit 402 is further configured to receive an updated system message sent by the serving cell through the Uu interface;

[0162] The sending unit 401 is further configured to send a second unicast message to the remote terminal through the PC5 interface corresponding to the PC5 link, where the second unicast message carries the updated system message.

[0163] In an optional manner, the receiving unit 402 is further configured to receive an updated system message sent by the serving cell through a Uu interface;

[0164] The establishing unit is further used to establish a temporary PC5 link with the remote terminal;

[0165] The sending unit 401 is further configured to send a second unicast message to the remote terminal through the PC5 interface corresponding to the temporary PC5 link, where the second unicast message carries the updated system message.

[0166] In an optional manner, the second unicast message carries a fourth container, and the fourth container is used to carry the updated system message.

[0167] In an optional manner, the system message includes at least one of the following: SIB1, SIB12, SIB13, SIB14.

[0168] Those skilled in the art should understand that the relevant description of the above-mentioned device for obtaining system messages in the embodiment of the present application can be understood by referring to the relevant description of the method for obtaining system messages in the embodiment of the present application.

[0169] Figure 5 is a schematic structural diagram of a communication device 500 provided in an embodiment of the present application. The communication device may be a terminal device or a network device. Figure 5 The communication device 500 shown includes a processor 510, and the processor 510 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0170] Alternatively, if Figure 5 As shown, the communication device 500 may further include a memory 520. The processor 510 may call and run a computer program from the memory 520 to implement the method in the embodiment of the present application.

[0171] The memory 520 may be a separate device independent of the processor 510 , or may be integrated into the processor 510 .

[0172] Alternatively, if Figure 5As shown, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0173] The transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include an antenna, and the number of the antennas may be one or more.

[0174] Optionally, the communication device 500 may specifically be a network device in an embodiment of the present application, and the communication device 500 may implement corresponding processes implemented by the network device in each method in the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0175] Optionally, the communication device 500 may specifically be a mobile terminal / terminal device of an embodiment of the present application, and the communication device 500 may implement the corresponding processes implemented by the mobile terminal / terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0176] Figure 6 It is a schematic structural diagram of the chip of an embodiment of the present application. Figure 6 The chip 600 shown includes a processor 610, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0177] Alternatively, if Figure 6 As shown, the chip 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

[0178] The memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .

[0179] Optionally, the chip 600 may further include an input interface 630. The processor 610 may control the input interface 630 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0180] Optionally, the chip 600 may further include an output interface 640. The processor 610 may control the output interface 640 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0181] Optionally, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0182] Optionally, the chip can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0183] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0184] Figure 7 is a schematic block diagram of a communication system 700 provided in an embodiment of the present application. Figure 7 As shown, the communication system 700 includes a terminal device 710 and a network device 720 .

[0185] Among them, the terminal device 710 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 720 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, they are not repeated here.

[0186] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0187] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used 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 dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0188] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0189] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0190] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0191] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0192] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0193] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0194] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments 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 various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0195] The embodiment of the present application also provides a computer program.

[0196] Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods in the embodiments of the present application. For the sake of brevity, they are not described here.

[0197] Optionally, the computer program can be applied to the mobile terminal / terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0198] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0199] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0200] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0201] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0202] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0203] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0204] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for obtaining system information, the method comprising: The remote terminal receives a first message sent by the relay terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery announcement message. The discovery announcement message carries a second container, the second container is used to carry the system message, and the discovery announcement message is carried on a physical sidelink shared channel PSSCH.

2. The method according to claim 1, wherein: The discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

3. The method according to claim 2, wherein: The discovery announcement message also carries a sending period of the discovery announcement message.

4. The method according to claim 2 or 3, wherein: The physical sidelink control channel PSCCH associated with the PSSCH carries sidelink control information SCI, where the SCI includes at least one of the following identifiers: A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message; A target identifier, wherein the target identifier is associated with at least one application service; An update flag is used to indicate whether the content in the discovery announcement message is updated.

5. The method according to claim 4, wherein: The update flag is used to indicate whether at least one of the system information and the discovery process related information in the discovery announcement message is updated; or, The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

6. The method according to claim 4, wherein: The method further comprises: When the remote terminal receives the discovery announcement message for the first time, the remote terminal decodes the discovery announcement message carried on the PSSCH.

7. The method according to claim 4, wherein: The method further comprises: When the remote terminal receives the discovery announcement message not for the first time, if the remote terminal determines according to the SCI that the source identifier and the target identifier have not changed, the remote terminal determines whether the content in the discovery announcement message is updated according to the update identifier in the SCI; If it is determined that the content in the discovery announcement message is not updated, the remote terminal does not decode the PSSCH carrying the discovery announcement message; or, If it is determined that the content in the discovery announcement message is updated, the remote terminal decodes the PSSCH carrying the discovery announcement message and obtains the updated content in the discovery announcement message.

8. The method according to claim 4, wherein: The method further comprises: If the remote terminal determines, according to the SCI, that the source identifier and / or the target identifier has changed, the remote terminal decodes the PSSCH carrying the discovery announcement message and obtains an updated discovery announcement message.

9. The method according to claim 1, wherein: The system message includes at least one of the following: system information blocks SIB1, SIB12, SIB13, SIB14.

10. A method for obtaining system information, the method comprising: The relay terminal sends a first message to the remote terminal, where the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery announcement message. The discovery announcement message carries a second container, the second container is used to carry the system message, and the discovery announcement message is carried on a physical sidelink shared channel PSSCH.

11. The method according to claim 10, wherein: The discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

12. The method according to claim 11, wherein: The discovery announcement message also carries a sending period of the discovery announcement message.

13. The method according to claim 11 or 12, wherein: The physical sidelink control channel PSCCH associated with the PSSCH carries sidelink control information SCI, where the SCI includes at least one of the following identifiers: A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message; A target identifier, wherein the target identifier is associated with at least one application service; An update flag is used to indicate whether the content in the discovery announcement message is updated.

14. The method according to claim 13, wherein: The update flag is used to indicate whether the system information and / or the discovery process related information in the discovery announcement message are updated; or, The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

15. The method according to claim 10, wherein: The system message includes at least one of the following: system information blocks SIB1, SIB12, SIB13, SIB14.

16. A device for obtaining system information, applied to a remote terminal, the device comprising: a receiving unit, configured to receive a first message sent by a relay terminal, wherein the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery announcement message, The discovery announcement message carries a second container, the second container is used to carry the system message, and the discovery announcement message is carried on a physical sidelink shared channel PSSCH.

17. The device according to claim 16, wherein: The discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

18. The device according to claim 17, wherein: The discovery announcement message also carries a sending period of the discovery announcement message.

19. The device according to claim 17 or 18, wherein: The physical sidelink control channel PSCCH associated with the PSSCH carries sidelink control information SCI, where the SCI includes at least one of the following identifiers: A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message; A target identifier, wherein the target identifier is associated with at least one application service; An update flag is used to indicate whether the content in the discovery announcement message is updated.

20. The device according to claim 19, wherein The update flag is used to indicate whether at least one of the system information and the discovery process related information in the discovery announcement message is updated; or, The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

21. The device according to claim 19, wherein The device also includes: The processing unit is configured to decode the discovery announcement message carried on the PSSCH when the discovery announcement message is received for the first time.

22. The device according to claim 19, wherein The device also includes: A processing unit is used to determine whether the content of the discovery announcement message is updated according to the update identifier in the SCI if it is not the first time that the discovery announcement message is received. If it is determined that the source identifier and the target identifier have not changed according to the SCI, if the discovery announcement message is not received for the first time, then the PSSCH carrying the discovery announcement message is not decoded; or if it is determined that the content of the discovery announcement message is updated, then the PSSCH carrying the discovery announcement message is decoded and the updated content in the discovery announcement message is obtained.

23. The device according to claim 19, wherein: The device also includes: A processing unit is configured to decode the PSSCH carrying the discovery announcement message and obtain an updated discovery announcement message if it is determined according to the SCI that the source identifier and / or the target identifier has changed.

24. The device according to claim 16, wherein: The system message includes at least one of the following: system information blocks SIB1, SIB12, SIB13, SIB14.

25. A device for obtaining system information, applied to a relay terminal, the device comprising: a sending unit, configured to send a first message to a remote terminal, wherein the first message carries a system message of a serving cell of the relay terminal, wherein the first message is a discovery announcement message, The discovery announcement message carries a second container, the second container is used to carry the system message, and the discovery announcement message is carried on a physical sidelink shared channel PSSCH.

26. The device according to claim 25, wherein The discovery announcement message also carries information related to the discovery process of the relay terminal, and the information related to the discovery process of the relay terminal includes at least one of the following: a user identifier of the relay terminal at the application layer, and an application service identifier of the relay terminal.

27. The device according to claim 26, wherein: The discovery announcement message also carries a sending period of the discovery announcement message.

28. The device according to claim 26 or 27, wherein The physical sidelink control channel PSCCH associated with the PSSCH carries sidelink control information SCI, where the SCI includes at least one of the following identifiers: A source identifier, where the source identifier is used to indicate an identifier of a terminal that sends the discovery announcement message; A target identifier, wherein the target identifier is associated with at least one application service; An update flag is used to indicate whether the content in the discovery announcement message is updated.

29. The device according to claim 28, wherein The update flag is used to indicate whether the system information and / or the discovery process related information in the discovery announcement message are updated; or, The update identifier includes a first sub-identifier and a second sub-identifier, the first sub-identifier is used to indicate whether the system information in the discovery announcement message is updated, and the second sub-identifier is used to indicate whether the discovery process related information in the discovery announcement message is updated.

30. The device according to claim 25, wherein: The system message includes at least one of the following: system information blocks SIB1, SIB12, SIB13, SIB14.

31. A terminal device, comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 9.

32. A network device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method according to any one of claims 10 to 15.

33. A chip, comprising: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 9.

34. A chip, comprising: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 10 to 15.

35. A computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 9.

36. A computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 10 to 15.

37. A computer program product comprising computer program instructions, the computer program instructions causing a computer to execute the method as claimed in any one of claims 1 to 9.

38. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 10 to 15.

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