Communication processing method and apparatus, device, and readable storage medium

Abstract

The present application discloses a communication processing method and apparatus, a device, and a readable storage medium. The method comprises: a first relay terminal receives first information from a remote terminal or from a previous-hop relay terminal of a first relay terminal, wherein the first information is used for requesting a system message, and the first information comprises at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal, wherein the second relay terminal is a relay terminal directly connected to a base station, and the first relay terminal is a relay terminal other than the second relay terminal.

Description

Communication processing method, device, equipment and readable storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 1, 2023, with application number 202311643566.1 and invention name “Communication processing method, device, equipment and readable storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a communication processing method, apparatus, device and readable storage medium. Background Art

[0004] Currently, the New Radio (NR) only supports single-hop UE-to-Network (U2N) relay, which has only one relay terminal (Relay UE). This application considers a multi-hop U2N relay scenario, where there are two or more Relay UEs. In this scenario, the system complexity increases dramatically. In this scenario, how to obtain system information for the Remote UE is an urgent problem to be solved. Summary of the Invention

[0005] The embodiments of the present application provide a communication processing method, apparatus, device, and readable storage medium to solve the problem of how a remote UE obtains system messages in a multi-hop U2N relay scenario.

[0006] In a first aspect, a communication processing method is provided, comprising:

[0007] The first relay terminal receives first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal;

[0008] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0009] In a second aspect, a communication processing method is provided, comprising:

[0010] The remote terminal sends first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal, a terminal identifier of the second relay terminal; and / or,

[0011] The remote terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal;

[0012] The second relay terminal is a relay terminal directly connected to the base station.

[0013] According to a third aspect, a communication processing method is provided, comprising:

[0014] The second relay terminal receives first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; or

[0015] The second relay terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal;

[0016] The second relay terminal is a relay terminal directly connected to the base station.

[0017] A fourth aspect provides a communication processing method, comprising:

[0018] The first relay terminal receives second information from the previous-hop relay terminal of the first relay terminal, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal;

[0019] The first relay terminal sends the second information to the remote terminal or a next-hop relay terminal of the first relay terminal;

[0020] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0021] In a fifth aspect, a communication processing method is provided, comprising:

[0022] A third relay terminal receives first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0023] In a sixth aspect, a communication processing method is provided, comprising:

[0024] The fourth relay terminal sends the first system information to the third relay terminal or the remote terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0025] In a seventh aspect, a communication processing device is provided, applied to a first relay terminal, including:

[0026] A first receiving module is configured to receive first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal;

[0027] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0028] In an eighth aspect, a communication processing device is provided, applied to a remote terminal, comprising:

[0029] A second sending module is configured to send first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal; or

[0030] A second receiving module is configured to receive second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal;

[0031] The second relay terminal is a relay terminal directly connected to the base station.

[0032] In a ninth aspect, a communication processing device is provided, applied to a second relay terminal, including:

[0033] a third receiving module, configured to receive first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; or

[0034] a fourth receiving module, configured to receive second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal;

[0035] The second relay terminal is a relay terminal directly connected to the base station.

[0036] According to a tenth aspect, a communication processing device is provided, which is applied with a first relay terminal, including:

[0037] a fifth receiving module, configured to receive second information from a previous-hop relay terminal of the first relay terminal, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal;

[0038] A third sending module is configured to send the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0039] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0040] In an eleventh aspect, a communication processing device is provided, applied to a third relay terminal, including:

[0041] The sixth receiving module is configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0042] According to a twelfth aspect, a communication processing device is provided, applied to a fourth relay terminal, including:

[0043] The fifth sending module is configured to send the first system information to a third relay terminal or a remote terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0044] In a thirteenth aspect, a communication system is provided, the communication system comprising a remote terminal, a first relay terminal, and a second relay terminal;

[0045] The remote terminal is used to execute the method according to the first aspect or the fourth aspect, the second relay terminal is used to execute the method according to the second aspect, and the first relay terminal is used to execute the steps of the method according to the fourth aspect; or

[0046] The communication system includes a third relay terminal and a fourth relay terminal, the third relay terminal is used to execute the steps of the method described in the fifth aspect, and the fourth relay terminal is used to execute the steps of the method described in the sixth aspect.

[0047] In the fourteenth aspect, a terminal is provided, comprising: a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, or the sixth aspect.

[0048] In the fifteenth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor of a terminal, the steps of the method described in the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, or the sixth aspect are implemented.

[0049] In the sixteenth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0050] In the seventeenth aspect, a computer program / program product is provided, which is stored in a non-volatile storage medium, and the program / program product is executed by at least one processor to implement the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0051] In the eighteenth aspect, a communication system is provided, which includes a terminal and a network side device, and the terminal is used to execute the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0052] In an embodiment of the present application, a first relay terminal receives first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal, a terminal identifier of the second relay terminal; wherein the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal, so as to enable the remote terminal to obtain the system message in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic diagram of UE-to-Network relay;

[0054] FIG2 is a schematic diagram of request-based system message transmission in a single-hop scenario;

[0055] Figure 3 is a schematic diagram of a system message actively pushed in a single-hop scenario;

[0056] Figures 4a and 4b are diagrams showing the definition of multi-hop L2 U2N relay network terms;

[0057] FIG5 is a schematic diagram of the architecture of a wireless communication system according to an embodiment of the present application;

[0058] FIG6 is a flow chart of a communication processing method according to an embodiment of the present application;

[0059] FIG7 is a second flowchart of the communication processing method provided in an embodiment of the present application;

[0060] FIG8 is a third flowchart of the communication processing method provided in an embodiment of the present application;

[0061] FIG9 is a fourth flowchart of the communication processing method provided in an embodiment of the present application;

[0062] FIG10 is a flowchart of a fifth communication processing method provided in an embodiment of the present application;

[0063] FIG11 is a sixth flowchart of the communication processing method provided in an embodiment of the present application;

[0064] FIG12 is a flowchart of a seventh communication processing method provided in an embodiment of the present application;

[0065] FIG13 is a schematic diagram of a network topology in a multi-hop scenario;

[0066] FIG14 is a flowchart of an eighth embodiment of the communication processing method provided in the present application;

[0067] FIG15 is a schematic diagram of a communication processing device according to an embodiment of the present application;

[0068] FIG16 is a second schematic diagram of a communication processing device provided in an embodiment of the present application;

[0069] FIG17 is a third schematic diagram of a communication processing device provided in an embodiment of the present application;

[0070] FIG18 is a fourth schematic diagram of a communication processing device provided in an embodiment of the present application;

[0071] FIG19 is a fifth schematic diagram of a communication processing device provided in an embodiment of the present application;

[0072] FIG20 is a sixth schematic diagram of a communication processing device provided in an embodiment of the present application;

[0073] FIG21 is a schematic diagram of a terminal according to an embodiment of the present application;

[0074] FIG22 is a second schematic diagram of a terminal provided in an embodiment of the present application;

[0075] Figures 23a and 23b are schematic diagrams of transmitting first information according to an embodiment of the present application;

[0076] Figures 24a and 24b are schematic diagrams of transmitting the second information provided in an embodiment of the present application. DETAILED DESCRIPTION

[0077] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0078] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0079] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in this application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR system applications, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0080] 1. About the Sidelink (SL) Relay Mechanism.

[0081] Relay technology in wireless communication systems adds one or more relays between a base station and a terminal (e.g., user equipment (UE)). These relays are responsible for forwarding wireless signals one or more times. That is, the wireless signal sent by the base station must go through multiple hops before reaching the UE.

[0082] Wireless relay technology not only expands cell coverage and fills blind spots, but also increases cell capacity through spatial resource reuse. For indoor coverage, relay technology can also overcome penetration loss and improve indoor coverage quality.

[0083] Taking the single-hop relay mechanism as an example, a wireless relay can split a base station-UE link into two links: base station-relay station and relay station-UE. This provides the opportunity to replace one poor-quality link with two high-quality links, thereby achieving higher link capacity and better coverage.

[0084] New Radio (NR) currently supports a UE-to-Network relay (U2N relay) mechanism based on a secondary link. This mechanism involves connecting a relay to the UE on one end and the network on the other. The UE that performs the wireless relay function is called a relay UE. The UE that relies on the relay UE to connect to the network is called a remote UE. Figure 1 shows a typical scenario.

[0085] Figure 1 shows a typical U2N relay scenario. The Remote UE needs to transmit data to the network side, but due to poor coverage, the data can be relayed through the Relay UE. The Uu interface is between the Relay UE and the base station, and the Sidelink PC5 interface is between the Relay UE and the Remote UE.

[0086] Generally speaking, a relay UE is open and can serve more than one remote UE. However, NR currently only supports single-hop U2N relay, meaning only one relay UE. To further address deep coverage holes and better support public safety services, NR will research how to support multi-hop U2N relay mechanisms. Simply put, multi-hop U2N relay is a scenario in which the remote UE and the network communicate with each other through two or more relay UEs for data transfer.

[0087] 2. Single-hop scenario: Remote UE obtains system information.

[0088] Mechanism 1: Request-based delivery mechanism.

[0089] Referring to Figure 2, the specific steps are as follows:

[0090] Step 0: The Remote UE establishes a PC5 Radio Resource Control (RRC) connection with the Relay UE.

[0091] Step 1: The Remote UE meets at least one of the following conditions:

[0092] (1) The Remote UE has system message request information to be sent;

[0093] (2) The system message request information of the Remote UE changes;

[0094] Sending a system message request message to the Relay UE, where the system message request message is sent via a PC5-RRC message and includes at least one SIB type;

[0095] Step 2: The Relay UE receives the PC5-RRC (eg, RemoteUEInformationSidelink) message sent by the Remote UE.

[0096] If the Relay UE determines that it does not store a valid version of the at least one System Information Block (SIB) type, it executes a system message acquisition procedure (i.e., an on-demand system information acquisition procedure (Uu on demand SI procedure)) based on the at least one SIB type to obtain a valid version of the at least one SIB type from the serving base station of the Relay UE.

[0097] If the Relay UE determines that it has stored a valid version of the at least one SIB type, step 3 is executed.

[0098] Step 3: The Relay UE sends system message forwarding information to the Remote UE, where the system message forwarding information is sent via a PC5-RRC message and includes a valid version of the at least one SIB type.

[0099] Step 4: If the Relay UE determines that the valid version of the at least one SIB type has changed, it sends system message forwarding information to the Remote UE again, where the system message forwarding information is sent via a PC5-RRC( message and includes the updated valid version of the at least one SIB type.

[0100] It can be understood that mechanism 1 is applicable to any SIB type (eg, SIB1, 2, 3, ..., etc.).

[0101] Mechanism 2: Unsolicited forwarding mechanism.

[0102] Referring to Figure 3, the specific steps are as follows:

[0103] Step 0: Discover and establish a connection with PC5.

[0104] Step 1: Transmit SIB1 via PC5-RRC message.

[0105] Step 2: Determine whether SIB1 is updated.

[0106] Step 3: Transmit SIB1 via PC5-RRC message.

[0107] It can be understood that mechanism 2 is mainly applicable to SIB1.

[0108] 3. Definition of terms regarding multi-hop relay networks:

[0109] For ease of understanding and description, the multi-hop Layer 2 (L2) U2N relay network is referred to as a multi-hop relay network in the application. With respect to the remote UE in FIG4a and FIG4b , the relay classification is defined as follows:

[0110] (1) Donor Relay UE: A relay UE that establishes a Uu connection with a serving base station or can establish a Uu connection with a serving base station, and helps downstream UEs forward data and signaling to the base station and forward data and signaling from the base station to downstream UEs;

[0111] Optionally, the host relay UE may include but is not limited to one of the following: 1) a Relay UE that undertakes PC5 hops + Uu hops; 2) a Relay UE directly connected to a base station; 3) an N-hop U2N relay network (N is a positive integer greater than 1), the N-hop Relay UE in uplink transmission; 4) an N-hop U2N relay network (N is a positive integer greater than 1), the first-hop Relay UE in downlink transmission.

[0112] (2) Access relay UE: A relay UE that establishes a PC5 connection with a remote UE and helps the remote UE forward uplink and downlink data and signaling is the access relay UE of the remote UE.

[0113] (3) Intermediate Relay UE: A relay UE located between an access relay UE and a host relay UE, helping remote UEs to forward data and signaling between the access relay UE and the host relay UE. In a multi-hop relay network, there can be zero, one, or multiple intermediate relay UEs between an access relay UE and a host relay UE of a remote relay UE. It should be noted that intermediate relay UEs can also include access relay UEs, that is, all relay UEs between the host relay UE and the remote UE are considered intermediate relay UEs, as shown in Figure 4b.

[0114] Optionally, the intermediate relay UE may include but is not limited to one of the following: 1) a Relay UE that undertakes multiple PC5 hops; 2) a Relay UE directly connected to a Remote UE; 3) any Relay UE other than a Relay UE directly connected to a base station; 4) the K-th hop Relay UE (K is any positive integer greater than or equal to 1 and less than N) in an N-hop U2N relay network (N is a positive integer greater than 1) in uplink or downlink transmission.

[0115] (4) Downstream UE: All UEs that access the network through a relay UE become downstream UEs of the relay UE.

[0116] For example, the remote UE is a downstream UE of the access relay UE, the remote UE and the access relay UE are downstream UEs of the intermediate relay UE, and the remote UE, the access relay UE, and the intermediate relay UE are downstream UEs of the host relay UE.

[0117] (5) Upstream UE: A relay UE that forwards uplink and downlink data and signaling for a UE is the upstream UE of the UE.

[0118] For example, in the uplink direction, the access relay UE, the intermediate relay UE or the donor relay UE is an upstream UE of the remote UE, and the donor relay UE and the intermediate relay UE are upstream UEs of the access relay UE.

[0119] In the downlink direction, the intermediate relay UE or the intermediate relay UE is the upstream UE of the donor relay UE.

[0120] (6) Child UE and parent UE: Relay UE a establishes a PC5 connection with the upstream relay UE b to access the network. Relay UE b is the parent UE of UE a, and relay UE a is the child UE of UE b.

[0121] For example, the host relay UE is the parent UE of the intermediate relay UE, the intermediate relay UE is the child UE of the host relay UE, the intermediate relay UE is the parent UE of the access relay UE, the access relay UE is the child UE of the intermediate relay, the access relay UE is the parent UE of the remote UE, and the remote UE is the child UE of the access relay UE.

[0122] The access relay UE also has the identity of a remote UE relative to the intermediate relay UE; and the intermediate relay UE has the identity of a remote UE relative to the host relay UE, and so on. This embodiment will not be described in detail later.

[0123] FIG5 shows a block diagram of a wireless communication system applicable to embodiments of the present application. The wireless communication system includes a terminal 51 and a network-side device 52 .

[0124] The terminal 51 may be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipborne equipment, pedestrian user equipment (PUE), smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM or self-service machine, etc. Wearable devices include smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. The vehicle-mounted device may also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit. In addition to the above-mentioned terminal devices, the terminal involved in this application may also be a chip within the terminal, such as a modem chip or a system-on-chip (SoC). It should be noted that the specific type of the terminal 51 is not limited in this embodiment of the application.

[0125] The network-side device 52 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network device, a radio access network (RAN), a radio access network function, or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS), or a wireless fidelity (WiFi) node. A base station may be referred to as a Node B (NB), an evolved Node B (eNB), the next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP), or other appropriate terms in the art. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0126] The core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access and mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data storage (UDR), home user server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), application function ( It should be noted that in the embodiments of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0127] The communication processing method, apparatus, communication device, and readable storage medium provided in the embodiments of the present application are described in detail below with reference to some embodiments and their application scenarios in conjunction with the accompanying drawings.

[0128] 6 , an embodiment of the present application provides a communication processing method, which is executed by a first relay terminal, and the specific steps include: step 601 .

[0129] Step 601: A first relay terminal receives first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message and includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal.

[0130] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0131] Taking FIG. 4 a as an example, the access relay terminal receives the first information from the remote terminal, or the intermediate relay terminal receives the first information from the access relay terminal, that is, the first relay terminal can be the access relay terminal or the intermediate relay terminal.

[0132] In one embodiment of the present application, the entire content of the first information may be carried by a PC5 RRC message, for example, by extending an existing PC5 RRC message with a new information element (IE) or a new PC5 RRC message, as shown in FIG23a.

[0133] In another embodiment of the present application, part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer (Sidelink Relay Adaption layer, SRAP) subheader, as shown in Figure 23b. For example, at least one SIB type is carried by a PC5 RRC message, and the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal are carried by a PC5 adaptation layer subheader. These two signaling design methods have their own advantages and disadvantages. The signaling scalability of the method shown in Figure 23a is strong, but the complexity of the processing required by the relay terminal is high. The method shown in Figure 23b uses transparent forwarding on the data plane, and the processing of the relay terminal is simple, but because the format is fixed, the content scalability is low.

[0134] In one embodiment of the present application, the terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the local identifier has a mapping relationship with the layer 2 identifier or the local identifier has a mapping relationship with the user information identifier.

[0135] Optionally, the Layer 2 ID includes at least one of the following: a Source Layer 2 ID and a Destination Layer 2 ID. It can be used at the access layer (AS layer) or the upper layer to identify terminals participating in different communication processes, such as unicast communication, groupcast communication, and broadcast communication.

[0136] Optionally, the user information identifier (User info ID) can be a 48-bit string that can be used in the access layer (AS layer) or the protocol layer (upper layer) above the AS layer to identify different terminal identities or roles, such as the announcer (announcer), discoverer (discoverer), and discoveree (discoveree) in the discovery process; the source terminal (Source UE) and target terminal (Target UE) in the unicast link establishment (PC5 unicast link establishment) process.

[0137] In one embodiment of the present application, the method further includes:

[0138] The first relay terminal sends the first information to a next-hop relay terminal of the first relay terminal.

[0139] In one embodiment of the present application, the first relay terminal sending the first information to a next-hop relay terminal of the first relay terminal includes:

[0140] If the first condition is met, the first relay terminal sends the first information to the next-hop relay terminal of the first relay terminal;

[0141] The first condition includes at least one of the following:

[0142] (1) The first relay terminal is in an Out-Of-Coverage (OOC) state;

[0143] (2) The value of the measurement quantity of the serving cell of the first relay terminal is less than or equal to a first preset threshold;

[0144] Optionally, the measurement quantity includes but is not limited to Reference Signal Received Power (RSRP).

[0145] It can be understood that, in this embodiment, no specific limitation is imposed on the first preset threshold.

[0146] (3) The serving cell of the first relay terminal is different from the serving cell of the second relay terminal;

[0147] (4) The first relay terminal does not have the capability of receiving or forwarding system information.

[0148] In one embodiment of the present application, the first relay terminal sending the first information to a next-hop relay terminal of the first relay terminal includes:

[0149] The first relay terminal determines a next-hop relay terminal of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the first information to the next-hop relay terminal.

[0150] Taking FIG4a as an example, the first relay terminal is an access relay terminal, and the next-hop relay terminal of the first relay terminal is an intermediate access terminal; the first relay terminal is an intermediate relay terminal, and the next-hop relay terminal of the first relay terminal is a host relay terminal.

[0151] In one embodiment of the present application, the method further includes:

[0152] If the second condition is met, the first relay terminal stops forwarding the first information;

[0153] The second condition includes at least one of the following:

[0154] (1) The first relay terminal is in the network coverage (IC) state;

[0155] (2) The value of the measurement quantity of the serving cell of the first relay terminal is greater than or equal to a second preset threshold;

[0156] Optionally, the measurement quantity includes but is not limited to RSRP.

[0157] It can be understood that the second preset threshold is not specifically limited in this embodiment.

[0158] (3) The serving cell of the first relay terminal is the same as the serving cell of the second relay terminal;

[0159] (4) The first relay terminal has the capability of receiving or forwarding system information;

[0160] (5) The first relay terminal has stored a valid version of the at least one SIB type.

[0161] In one embodiment of the present application, the method further includes:

[0162] The second condition does not include that the first relay terminal has stored a valid version of the at least one SIB type, and if the first relay terminal does not store a valid version of the at least one SIB type, the first relay terminal obtains the valid version of the at least one SIB type.

[0163] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0164] 7 , an embodiment of the present application provides a communication processing method, which is applied to a remote terminal, and the specific steps include: Step 701 .

[0165] Step 701: A remote terminal sends first information, where the first information is used to request a system message and includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal; or the remote terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal.

[0166] The second relay terminal is a relay terminal directly connected to the base station.

[0167] Taking FIG. 4a and FIG. 4b as examples, the second relay terminal is a host relay terminal.

[0168] In one embodiment of the present application, the entire content of the second information may be carried by a PC5 RRC message, for example, by extending a new IE based on an existing PC5 RRC message or by sending a new PC5 RRC message, as shown in FIG24a.

[0169] In another embodiment of the present application, part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer (Sidelink Relay Adaption layer, SRAP) subheader, as shown in Figure 24b. For example, the valid version of the at least one SIB type is carried by a PC5 RRC message, and the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal are carried by a PC5 adaptation layer subheader. These two signaling design methods have their own advantages and disadvantages. The signaling scalability of the method shown in Figure 24a is strong, but the complexity of the processing required by the relay terminal is high. The method shown in Figure 24b uses transparent forwarding on the data plane, and the processing of the relay terminal is simple, but because the format is fixed, the content scalability is low.

[0170] In one embodiment of the present application, the terminal identifier is at least one of a Local identifier, a Layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the Layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0171] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier and a target layer 2 identifier, which can be used by protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0172] Optionally, the user information identifier can be a 48-bit string that can be used in the access layer or protocol layers above the AS layer to identify different terminal identities or roles, such as the broadcaster, discoverer, and discoveree in the discovery process; the source terminal and target terminal in the unicast connection establishment process.

[0173] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0174] 8 , an embodiment of the present application provides a communication processing method, which is applied to a second relay terminal. The specific steps include: step 801 or step 802 .

[0175] Step 801: A second relay terminal receives first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal;

[0176] Step 802: The second relay terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal.

[0177] The second relay terminal is a relay terminal directly connected to the base station.

[0178] Taking Figures 4a and 4b as an example, the second relay terminal is a host relay terminal. The host relay terminal receives the first information from the intermediate relay terminal, and the host relay terminal receives the second information from the service mechanism.

[0179] In one embodiment of the present application, the terminal identifier is at least one of a Local identifier, a Layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the Layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0180] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier and a target layer 2 identifier, which can be used by protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0181] Optionally, the user information identifier can be a 48-bit string that can be used in the access layer or protocol layers above the AS layer to identify different terminal identities or roles, such as the broadcaster, discoverer, and discoveree in the discovery process; the source terminal and target terminal in the unicast connection establishment process.

[0182] In one embodiment of the present application, all of the first information is carried by a PC5 RRC message, or part of the first information is carried by a PC5 RRC message, and the remaining part of the first information is carried by a PC5 adaptation layer subheader.

[0183] In one embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer subheader.

[0184] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0185] 9 , an embodiment of the present application provides a communication processing method, which is applied to a first relay terminal. The specific steps include: step 901 and step 902 .

[0186] Step 901: A first relay terminal receives second information from a previous-hop relay terminal of the first relay terminal, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal;

[0187] Step 902: The first relay terminal sends the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0188] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0189] Taking Figure 4a as an example, the first relay terminal is the access relay terminal, the access relay terminal receives the second information from the intermediate relay terminal, and the access relay terminal sends the second information to the remote terminal, or the first relay terminal is the intermediate relay terminal, the intermediate relay terminal receives the first information from the host relay terminal, and the intermediate relay terminal sends the second information to the access relay terminal.

[0190] In one embodiment of the present application, the terminal identifier is at least one of a Local identifier, a Layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the Layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0191] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier and a target layer 2 identifier, which can be used by protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0192] Optionally, the user information identifier can be a 48-bit string that can be used in the access layer or protocol layers above the AS layer to identify different terminal identities or roles, such as the broadcaster, discoverer, and discoveree in the discovery process; the source terminal and target terminal in the unicast connection establishment process.

[0193] In one embodiment of the present application, the first relay terminal sending the second information to the remote terminal or the next-hop relay terminal of the first relay terminal includes:

[0194] The first relay terminal determines the remote terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the second information to the remote terminal;

[0195] or,

[0196] The first relay terminal determines a next-hop relay terminal of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the second information to the next-hop relay terminal of the first relay terminal.

[0197] In one embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer subheader.

[0198] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0199] Referring to FIG10 , an embodiment of the present application provides a communication processing method, which is applied to a third relay terminal. The specific steps include:

[0200] Step 1001: A third relay terminal receives first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0201] Taking FIG4a as an example, the third relay terminal is an intermediate relay terminal, which receives the first system information from the host relay terminal and forwards the first system information to the access relay terminal.

[0202] Taking Figure 4a as an example, the third relay terminal is an access relay terminal. The access relay terminal receives the first system information from the intermediate relay terminal and forwards the first system information to the remote terminal. For example, when the remote terminal completes establishment of the PC5 RRC connection or after the PC5 RRC connection is established, the access relay terminal proactively forwards the first system information to the remote terminal.

[0203] Optionally, the first system information includes but is not limited to SIB1.

[0204] In one embodiment of the present application, the method further includes:

[0205] The third relay terminal receives the second system information sent by the fourth relay terminal;

[0206] The third relay terminal sends the second system information to a target terminal, where the target terminal is a downstream terminal of the third relay terminal.

[0207] Taking FIG4a as an example, the third relay terminal is an intermediate relay terminal, which receives the second system information from the host relay terminal and sends the second system information to the access relay terminal (downstream terminal of the intermediate relay terminal).

[0208] Taking FIG4a as an example, the third relay terminal is an access relay terminal, which receives the second system information from the intermediate relay terminal and sends the second system information to the remote terminal (a downstream terminal of the intermediate relay terminal).

[0209] Optionally, the second system information includes at least one of the following: SIB2, SIB3, ... and other SIBs except SIB1.

[0210] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0211] 11 , an embodiment of the present application provides a communication processing method, which is applied to a fourth relay terminal, and the specific steps include step 1101 .

[0212] Step 1101: a fourth relay terminal sends first system information to a third relay terminal or a remote terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0213] Taking FIG4a as an example, the fourth relay terminal is an intermediate relay terminal, and the intermediate relay terminal actively sends the first system information to the access relay terminal.

[0214] Taking FIG. 4 a as an example, the fourth relay terminal is an access relay terminal, and the access relay terminal actively sends the first system information to the remote terminal.

[0215] In one embodiment of the present application, the fourth relay terminal sending the first system information to the remote terminal includes:

[0216] When the PC5 RRC connection between the remote terminal and the fourth relay terminal is established or after the PC5 RRC connection is established, the fourth relay terminal sends the first system information to the remote terminal.

[0217] In this embodiment, the remote terminal obtains system information in a multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot communicate with the network side.

[0218] Several optional embodiments of the present application are introduced below in conjunction with specific implementation methods.

[0219] In implementation mode 1 and implementation mode 2, the remote terminal is Remote UE, the second relay terminal is Relay UE-4, the first relay terminal is Relay UE-1, Relay UE-2 or Relay UE-3, and the first information is system message request information.

[0220] Implementation method 1: Donor Relay UE obtains and forwards system messages.

[0221] For example, the number of relay UEs N=4, as shown in Figure 12. The Donor Relay UE is Relay UE 4:

[0222] Step 0: The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4.

[0223] Step 1: The Remote UE meets at least one of the following conditions:

[0224] (1) The Remote UE has system message request information to be sent;

[0225] (2) The system message request information of the Remote UE changes;

[0226] Send a system message request message to Relay UE-1, where the system message request message includes at least one of the following:

[0227] (1) At least one SIB type;

[0228] (2) UE ID of the Remote UE. Optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0229] (3) UE ID of Relay UE-4 (ie, Donor Relay UE). Optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0230] Step 2: Relay UE-1 receives the system message request information sent by Remote UE and performs one of the following actions:

[0231] Action 1: Determine, based on the UE ID information included in the system message request message, that the system message request message be forwarded to the next hop relay UE-2;

[0232] Action 2: forward the system message request information to the next hop relay UE-2;

[0233] The difference between Behavior 1 and Behavior 2 is the complexity of the network topology. Behavior 1 is applicable to relatively complex topologies (such as the topology shown in FIG13 ), where the previous hop or next hop of each Relay UE may be multiple different Relay UEs; Behavior 2 is applicable to deterministic topologies, where the previous hop or next hop of each Relay UE is a certain Relay UE.

[0234] Step 3: Relay UE-2 receives the system message request message sent by Relay UE-1 and performs one of the following actions:

[0235] Action 1: Determine, based on the UE ID information included in the system message request message, that the system message request message be forwarded to the next hop relay UE-3;

[0236] Action 2: forward the system message request information to the next hop relay UE-3;

[0237] Step 4: Relay UE-3 receives the system message request message sent by Relay UE-2 and performs one of the following actions:

[0238] (1) Determine, based on the UE ID information included in the system message request information, whether to forward the system message request information to the next hop relay UE-4;

[0239] (2) Forwarding the system message request information to the next hop relay UE-4;

[0240] Step 5: Relay UE-4 receives the system message request information sent by Relay UE-3 and further determines the following based on at least one SIB type information included in the system message request information:

[0241] (1) If Relay UE-4 determines that it does not store a valid version of the at least one SIB type, it executes a system message acquisition procedure (i.e., a Uu on-demand SI procedure) based on the at least one SIB type to obtain a valid version of the at least one SIB type from the Relay UE's serving base station. Then, execute step 6.

[0242] (2) If Relay UE-4 determines that it has stored a valid version of the at least one SIB type, it directly executes step 6.

[0243] Step 6: Relay UE-4 sends system message forwarding information to Relay UE-3. The system message forwarding information includes at least one of the following:

[0244] (1) A valid version of the at least one SIB type.

[0245] (2) UE ID of the Remote UE; optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0246] (3) UE ID of Relay UE-4 (ie, Donor Relay UE); optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0247] Step 7: Relay UE-3 receives the system message forwarding information sent by Relay UE-4 and performs one of the following actions:

[0248] (1) Determine, based on the UE ID information included in the system message forwarding information, whether to forward the system message forwarding information to the next hop relay UE-2;

[0249] (2) Forwarding the system message forwarding information to the next hop relay UE-2;

[0250] Step 8: Relay UE-2 receives the system message forwarding information sent by Relay UE-3 and performs one of the following actions:

[0251] (1) Determine, based on the UE ID information included in the system message forwarding information, whether to forward the system message forwarding information to the next hop relay UE-1;

[0252] (2) Forwarding the system message forwarding information to the next hop relay UE-1;

[0253] Step 9: Relay UE-1 receives the system message forwarding information sent by Relay UE-2 and performs one of the following actions:

[0254] Action 1: Determine, based on the UE ID information included in the system message forwarding information, whether to forward the system message forwarding information to the Remote UE;

[0255] Action 2: forward the system message forwarding information to the Remote UE;

[0256] Step 10: If Relay UE-4 determines that the valid version of the at least one SIB type has changed, the condition for resending the system message forwarding information is met, and the system message forwarding information includes the updated valid version of the at least one SIB type.

[0257] If the conditions in step 10 are met, steps 11-14 are executed. The process is the same as steps 6-9 and will not be repeated here.

[0258] It should be noted that the purpose of the L2 ID carried in the system message request information in step 1 is to determine the next-hop Relay UE, taking FIG. 13 as an example.

[0259] In the sending direction (taking Relay UE-2 as an example), when the system message request information received by Relay UE-2 contains the L2 ID of Remote UE-1 or the L2 ID of Relay UE-4, the next hop is determined to be Relay UE-3; if it contains the L2 ID of Remote UE-2 or the L2 ID of Relay UE-7, the next hop is determined to be Relay UE-6.

[0260] In the receiving direction (taking Relay UE-2 as an example), if the system message forwarding information received by Relay UE-2 contains the L2 ID of Remote UE-1 or the L2 ID of Relay UE-4, the next hop is determined to be Relay UE-1; if it contains the L2 ID of Remote UE-2 or the L2 ID of Relay UE-7, the next hop is determined to be Relay UE-5.

[0261] Implementation method 2: a certain Intermediate Relay UE obtains and forwards the execution system message.

[0262] Take the number of relay UEs N=4 as an example, as shown in Figure 14. Intermediate Relay UEs include Relay UE 1, Relay UE 2, and Relay UE 3, and the Intermediate Relay UE that performs system message forwarding is Relay UE 2:

[0263] Step 0: The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3 (optional), and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4 (optional).

[0264] Step 1: The Remote UE meets at least one of the following conditions:

[0265] (1) The Remote UE has system message request information to be sent;

[0266] (2) The system message request information of the Remote UE changes;

[0267] Send a system message request message to Relay UE-1, where the system message request message includes at least one of the following:

[0268] (1) At least one SIB type;

[0269] (2) UE ID of the Remote UE; optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0270] (3) UE ID of Relay UE-4 (ie, Donor Relay UE); optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0271] Step 2: Relay UE-1 receives the system message request information sent by the Remote UE. Before performing one of the following actions, it first determines whether Relay UE-1 meets the conditions for receiving and / or forwarding system messages. The conditions for receiving and / or forwarding system messages include at least one of the following:

[0272] Condition 1) Your own network coverage status:

[0273] The state of being in network coverage (in-coverage, IC) is considered to meet condition 1; the state of being out of network coverage (out-of-coverage, OOC) is considered to not meet condition 1.

[0274] Condition 2) The value of the measurement quantity of the Uu serving cell of Relay UE-1:

[0275] If the RSRP value of the measurement quantity of the Uu serving cell is higher than the preset threshold TH, it is considered that condition 2 is met; if the RSRP value of the measurement quantity of the Uu serving cell is lower than or equal to the preset threshold (Threshold, TH), it is considered that condition 2 is not met.

[0276] Condition 3) Whether the Uu serving cell of Relay UE-1 and the Uu serving cell of Donor Relay UE are the same: if they are the same cell, condition 3 is satisfied; if they are different cells, condition 3 is not satisfied.

[0277] Condition 4) Does Relay UE-1 have the willingness (volunteer) or ability to receive and / or forward system messages? If it has the willingness or ability, condition 4 is satisfied; if it has no willingness or ability, condition 4 is not satisfied.

[0278] Step 3: If the Relay UE-1 determines that it does not meet the conditions for receiving and / or forwarding system messages, it performs one of the following actions:

[0279] Action 1: Determine, based on the UE ID information included in the system message request message, that the system message request message be forwarded to the next hop relay UE-2;

[0280] Action 2: forward the system message request information to the next hop relay UE-2;

[0281] It should be noted that the difference between Behavior 1 and Behavior 2 lies in the complexity of the network topology. Behavior 1 is applicable to relatively complex topologies (such as the topology shown in Figure 13), where each Relay UE's previous hop or next hop may have multiple different Relay UEs. Behavior 2 is applicable to deterministic topologies, where each Relay UE's previous hop or next hop is a specific Relay UE.

[0282] Step 4: Relay UE-2 receives the system message request message sent by Relay UE-1. Before performing one of the following actions, it first determines whether Relay UE-2 meets the conditions for receiving and / or forwarding system messages. The conditions for receiving and / or forwarding system messages include:

[0283] Condition 1) Network coverage status of Relay UE-2: A state in which the UE is in network coverage (in-coverage, IC) is considered to satisfy condition 1, and a state out of network coverage (out-of-coverage, OOC) is considered to not satisfy condition 1.

[0284] Condition 2) The value of the measurement quantity of the Uu serving cell of Relay UE-2: The value of the measurement quantity RSRP of the Uu serving cell is higher than the preset threshold TH, which is considered to meet the condition; the value of the measurement quantity RSRP of the Uu serving cell is lower than or equal to the preset threshold TH, which is considered to not meet the condition.

[0285] Condition 3) Whether the Uu serving cell of Relay UE-2 and the Uu serving cell of Donor Relay UE are the same: if they are the same cell, the condition is satisfied; if they are different cells, the condition is not satisfied.

[0286] Condition 4) Whether Relay UE-2 has the willingness (volunteer) or ability to receive and / or forward system messages: If it has the willingness or ability, the condition is satisfied; if it has no willingness or ability, the condition is not satisfied.

[0287] If at least one condition is met during reception and / or forwarding of the system message, the forwarding of the system message request information is stopped.

[0288] Step 5: Further determine the following based on at least one SIB type information included in the system message request information:

[0289] (1) If Relay UE-2 determines that it does not store a valid version of the at least one SIB type, it executes a system message acquisition procedure (i.e., a Uu on demand SI procedure) based on the at least one SIB type to obtain a valid version of the at least one SIB type from the serving base station of the Relay UE. Then, it executes step 6.

[0290] (2) If Relay UE-2 determines that it has stored a valid version of the at least one SIB type, it directly executes step 6.

[0291] Step 6: Relay UE-2 sends system message forwarding information to Relay UE-1. The system message forwarding information includes at least one of the following:

[0292] (1) A valid version of the at least one SIB type.

[0293] (2) UE ID of the Remote UE; optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0294] (3) UE ID of Relay UE-4 (ie, Donor Relay UE); optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0295] Step 7: Relay UE-1 receives the system message forwarding information sent by Relay UE-2 and performs one of the following actions:

[0296] Action 1: Determine, based on the UE ID information included in the system message forwarding information, whether to forward the system message forwarding information to the Remote UE;

[0297] Action 2: forward the system message forwarding information to the next hop Remote UE;

[0298] Step 8: If Relay UE-2 determines that the valid version of the at least one SIB type has changed, the condition for resending the system message forwarding information is met, and the system message forwarding information includes the updated valid version of the at least one SIB type.

[0299] If the conditions in step 8 are met, execute steps 9-10. The process is the same as steps 6-7 and will not be repeated here.

[0300] Implementation method three: Active multi-hop forwarding of system messages

[0301] Any relay terminal proactively forwards a system message, where the forwarding includes at least one of the following:

[0302] (1) The relay terminal proactively forwards the SIB1 of the serving cell received from the parent relay terminal;

[0303] (2) When a new remote UE accesses through the parent relay terminal (e.g., when the PC5 RRC connection is established or after the PC5 RRC connection is established), the parent relay terminal proactively sends SIB1 to the new remote UE;

[0304] (3) Include some system information received from the parent relay terminal's PC5-RRC message in its own PC5-RRC message and send it to the downstream UE, including, for example, SIB2, 3, 4, ..., SIBx, ...

[0305] 15 , an embodiment of the present application provides a communication processing device, which is applied to a first relay terminal. The device 1500 includes:

[0306] A first receiving module 1501 is configured to receive first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal;

[0307] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0308] In one embodiment of the present application, the terminal identifier is at least one of a Local identifier, a Layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the Layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0309] In one embodiment of the present application, the device further comprises:

[0310] The first sending module is configured to send the first information to a next-hop relay terminal of the first relay terminal.

[0311] In one embodiment of the present application, the first sending module is further configured to: if a first condition is met, send the first information to a next-hop relay terminal of the first relay terminal;

[0312] The first condition includes at least one of the following:

[0313] The first relay terminal is out of network coverage;

[0314] A value of the measurement quantity of the serving cell of the first relay terminal is less than or equal to a first preset threshold;

[0315] A serving cell of the first relay terminal is different from a serving cell of the second relay terminal;

[0316] The first relay terminal does not have the capability of receiving or forwarding system information.

[0317] In one embodiment of the present application, the first sending module is further used to: determine the next-hop relay terminal of the first relay terminal based on at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and send the first information to the next-hop relay terminal.

[0318] In one embodiment of the present application, the device further comprises:

[0319] A first processing module, configured to stop forwarding the first information if a second condition is met;

[0320] The second condition includes at least one of the following:

[0321] The first relay terminal is in a state of being within network coverage;

[0322] A value of the measurement quantity of the serving cell of the first relay terminal is greater than or equal to a second preset threshold;

[0323] The serving cell of the first relay terminal is the same as the serving cell of the second relay terminal;

[0324] The first relay terminal has a capability of receiving or forwarding system information;

[0325] The first relay terminal has stored a valid version of the at least one SIB type.

[0326] In one embodiment of the present application, the device further comprises:

[0327] The first acquisition module is configured to acquire the valid version of the at least one SIB type when the second condition does not include that the first relay terminal has stored a valid version of the at least one SIB type, and when the first relay terminal does not store a valid version of the at least one SIB type.

[0328] In one embodiment of the present application, all of the first information is carried by a PC5 RRC message, or part of the first information is carried by a PC5 RRC message, and the remaining part of the first information is carried by a PC5 adaptation layer subheader.

[0329] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 6 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0330] 16 , an embodiment of the present application provides a communication processing device, which is applied to a remote terminal. The device 1600 includes:

[0331] The second sending module 1601 is configured to send first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal; or

[0332] The second receiving module 1602 is configured to receive second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal;

[0333] The second relay terminal is a relay terminal directly connected to the base station.

[0334] In one embodiment of the present application, the terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the local identifier has a mapping relationship with the layer 2 identifier or the local identifier has a mapping relationship with the user information identifier.

[0335] In one embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer subheader.

[0336] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 7 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0337] 17 , an embodiment of the present application provides a communication processing device, which is applied to a second relay terminal. The device 1700 includes:

[0338] The third receiving module 1701 is configured to receive first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; or

[0339] The fourth receiving module 1702 is configured to receive second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal;

[0340] The second relay terminal is a relay terminal directly connected to the base station.

[0341] In one embodiment of the present application, the terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the local identifier has a mapping relationship with the layer 2 identifier or the local identifier has a mapping relationship with the user information identifier.

[0342] In one embodiment of the present application, all of the first information is carried by a PC5 RRC message, or part of the first information is carried by a PC5 RRC message, and the remaining part of the first information is carried by a PC5 adaptation layer subheader.

[0343] In one embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer subheader.

[0344] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 8 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0345] 18 , an embodiment of the present application provides a communication processing device, which is applied with a first relay terminal. The device 1800 includes:

[0346] A fifth receiving module 1801 is configured to receive second information from a previous-hop relay terminal of the first relay terminal, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal;

[0347] A third sending module 1802 is configured to send the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0348] The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0349] In one embodiment of the present application, the terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the local identifier has a mapping relationship with the layer 2 identifier or the local identifier has a mapping relationship with the user information identifier.

[0350] In one embodiment of the present application, the third sending module 1802 is further configured to:

[0351] determining the remote terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sending the second information to the remote terminal;

[0352] or,

[0353] At least one of the next-hop relay terminals of the first relay terminal is determined according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and the second information is sent to the next-hop relay terminal of the first relay terminal.

[0354] In one embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer subheader.

[0355] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 9 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0356] 19 , an embodiment of the present application provides a communication processing method, which is applied to a third relay terminal. The apparatus 1900 includes:

[0357] The sixth receiving module 1901 is configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0358] In one embodiment of the present application, the device further comprises:

[0359] a seventh receiving module, configured to receive the second system information sent by the fourth relay terminal;

[0360] The fourth sending module is configured to send the second system information to a target terminal, where the target terminal is a downstream terminal of the third relay terminal.

[0361] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 10 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0362] 20 , an embodiment of the present application provides a communication processing method, which is applied to a fourth relay terminal. The apparatus 1900 includes:

[0363] The fifth sending module 2001 is configured to send first system information to a third relay terminal or a remote terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0364] In one embodiment of the present application, the fifth sending module 2001 is further configured to:

[0365] When the PC5 RRC connection between the remote terminal and the fourth relay terminal is established or after the PC5 RRC connection is established, the fourth relay terminal sends the first system information to the remote terminal.

[0366] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 11 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0367] FIG21 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application. The terminal 2100 includes, but is not limited to, at least some of the components including a radio frequency unit 2101, a network module 2102, an audio output unit 2103, an input unit 2104, a sensor 2105, a display unit 2106, a user input unit 2107, an interface unit 2108, a memory 2109, and a processor 2110.

[0368] Those skilled in the art will appreciate that the terminal 2100 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 2110 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG21 does not limit the terminal. The terminal may include more or fewer components than shown, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0369] It should be understood that in an embodiment of the present application, the input unit 2104 may include a graphics processing unit (GPU) 21041 and a microphone 21042, and the graphics processor 21041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 2106 may include a display panel 21061, and the display panel 21061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 2107 includes a touch panel 21071 and at least one of other input devices 21072. The touch panel 21071 is also called a touch screen. The touch panel 21071 may include two parts: a touch detection device and a touch controller. Other input devices 21072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0370] In the embodiment of the present application, after receiving downlink data from the network-side device, the RF unit 2101 can transmit the data to the processor 2110 for processing. In addition, the RF unit 2101 can send uplink data to the network-side device. Generally, the RF unit 2101 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0371] The memory 2109 can be used to store software programs or instructions and various data. The memory 2109 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 2109 may include a volatile memory or a non-volatile memory, or the memory 2109 may include a non-transient memory. Among them, the non-volatile memory or non-transient memory may 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. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 2109 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0372] Processor 2110 may include one or more processing units. Optionally, processor 2110 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 2110.

[0373] The terminal provided in the embodiment of the present application can implement the various processes implemented by the method embodiment of Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11, and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0374] As shown in Figure 22, an embodiment of the present application also provides a terminal 2200, including a processor 2201 and a memory 2202, and the memory 2202 stores a program or instruction that can be run on the processor 2201. When the program or instruction is executed by the processor 2201, it implements the various steps of the method embodiments of Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 above and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0375] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the method of Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 and the various processes of the above-mentioned embodiments are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0376] The processor is the processor in the terminal or network-side device described in the above embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0377] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes shown in Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 and the various method embodiments mentioned above, and can achieve the same technical effect. To avoid repetition, they will not be repeated here.

[0378] 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.

[0379] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium and is executed by at least one processor to implement the various processes shown in Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 and the various method embodiments described above, and can achieve the same technical effects. To avoid repetition, they are not described here.

[0380] An embodiment of the present application also provides a communication system, which includes a remote terminal, a first relay terminal, and a second relay terminal; wherein the remote terminal is used to execute the various processes of the method embodiment as shown in Figure 7, and can achieve the same technical effect, the second relay terminal is used to execute the various processes of the method embodiment as shown in Figure 8, and can achieve the same technical effect, and the first relay terminal is used to execute the various processes of the method embodiment as shown in Figure 6 or Figure 9, and can achieve the same technical effect.

[0381] An embodiment of the present application also provides a communication system, which includes a third relay terminal and a fourth relay terminal. The third relay terminal is used to execute the various processes of the method embodiment as shown in Figure 10 and can achieve the same technical effect. The fourth relay terminal is used to execute the various processes of the method embodiment as shown in Figure 11 and can achieve the same technical effect.

[0382] The communication system includes a terminal and a network side device, and the terminal is used to execute the various processes as shown in Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 or Figure 12 and the various method embodiments mentioned above, and can achieve the same technical effect. In order to avoid repetition, it will not be repeated here.

[0383] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0384] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0385] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A communication processing method, wherein: include: The first relay terminal receives first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal; The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

2. The method according to claim 1, wherein: The terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

3. The method according to claim 1, wherein: The method further comprises: The first relay terminal sends the first information to a next-hop relay terminal of the first relay terminal.

4. The method according to claim 3, wherein: The first relay terminal sending the first information to a next-hop relay terminal of the first relay terminal includes: If the first condition is met, the first relay terminal sends the first information to the next-hop relay terminal of the first relay terminal; The first condition includes at least one of the following: The first relay terminal is out of network coverage; A value of the measurement amount of the serving cell of the first relay terminal is less than or equal to a first preset threshold; A serving cell of the first relay terminal is different from a serving cell of the second relay terminal; The first relay terminal does not have the capability of receiving or forwarding system information.

5. The method according to claim 3 or 4, wherein: The first relay terminal sending the first information to a next-hop relay terminal of the first relay terminal includes: The first relay terminal determines a next-hop relay terminal of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the first information to the next-hop relay terminal.

6. The method according to claim 3, wherein: The method further comprises: If the second condition is met, the first relay terminal stops forwarding the first information; The second condition includes at least one of the following: The first relay terminal is in a state of being within network coverage; A value of the measurement amount of the serving cell of the first relay terminal is greater than or equal to a second preset threshold; The serving cell of the first relay terminal is the same as the serving cell of the second relay terminal; The first relay terminal has a capability of receiving system information or forwarding system information; The first relay terminal has stored a valid version of the at least one SIB type.

7. The method according to claim 6, wherein: The method further comprises: The second condition does not include that the first relay terminal has stored a valid version of the at least one SIB type, and in a case where the first relay terminal does not store a valid version of the at least one SIB type, the first relay terminal obtains the valid version of the at least one SIB type.

8. The method according to claim 1, wherein: The entire content of the first information is carried by a PC5 RRC message, or part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer subheader.

9. A communication processing method, wherein: include: The remote terminal sends first information, where the first information is used to request a system message, and the first information includes at least one system information block SIB type and at least one of the following: a terminal identifier of the remote terminal, a terminal identifier of the second relay terminal; and / or, The remote terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal; The second relay terminal is a relay terminal directly connected to the base station.

10. The method according to claim 9, wherein: The terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

11. The method according to claim 9, wherein: The entire content of the first information is carried by a PC5 RRC message, or part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer subheader.

12. The method according to claim 9, wherein: The entire content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining part of the content of the second information is carried by a PC5 adaptation layer subheader.

13. A communication processing method, wherein: include: The second relay terminal receives first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; or, The second relay terminal receives second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; The second relay terminal is a relay terminal directly connected to the base station.

14. The method according to claim 13, wherein: The terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

15. The method according to claim 13, wherein: The entire content of the first information is carried by a PC5 RRC message, or part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer subheader.

16. The method according to claim 13, wherein: The entire content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining part of the content of the second information is carried by a PC5 adaptation layer subheader.

17. A communication processing method, wherein: include: The first relay terminal receives second information from a previous-hop relay terminal of the first relay terminal, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal; The first relay terminal sends the second information to the remote terminal or a next-hop relay terminal of the first relay terminal; The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

18. The method according to claim 17, wherein: The terminal identifier is at least one of a local identifier, a layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

19. The method according to claim 17, wherein: The first relay terminal sending the second information to the remote terminal or a next-hop relay terminal of the first relay terminal includes: The first relay terminal determines the remote terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the second information to the remote terminal; or, The first relay terminal determines at least one of the next-hop relay terminals of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the second information to the next-hop relay terminal of the first relay terminal.

20. The method according to claim 17, wherein: The entire content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining part of the content of the second information is carried by a PC5 adaptation layer subheader.

21. A communication processing method, wherein: include: The third relay terminal receives first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

22. The method according to claim 21, wherein: The method further comprises: The third relay terminal receives the second system information sent by the fourth relay terminal; The third relay terminal sends the second system information to a target terminal, where the target terminal is a downstream terminal of the third relay terminal.

23. A communication processing method, wherein: include: The fourth relay terminal sends the first system information to the third relay terminal or the remote terminal, and the fourth relay terminal is a parent relay terminal of the third relay terminal.

24. The method according to claim 23, wherein: The fourth relay terminal sends the first system information to the remote terminal, including: When the PC5 radio resource control RRC connection between the remote terminal and the fourth relay terminal is established or after the PC5 radio resource control RRC connection between the remote terminal and the fourth relay terminal is established, the fourth relay terminal sends the first system information to the remote terminal.

25. A communication processing device, applied to a first relay terminal, wherein: include: A first receiving module, configured to receive first information from a remote terminal or from a previous-hop relay terminal of the first relay terminal, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal; The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

26. The device according to claim 25, wherein The terminal identifier is at least one of a Local identifier, a layer 2 identifier, and a user information identifier; wherein the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

27. A communication processing device, applied to a remote terminal, wherein: include: a second sending module, configured to send first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal; or A second receiving module is configured to receive second information, where the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal and a terminal identifier of the second relay terminal; The second relay terminal is a relay terminal directly connected to the base station.

28. A communication processing device, applied to a second relay terminal, wherein: include: a third receiving module, configured to receive first information, where the first information is used to request a system message, and the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; or a fourth receiving module, configured to receive second information, wherein the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of the second relay terminal; The second relay terminal is a relay terminal directly connected to the base station.

29. A communication processing device, using a first relay terminal, wherein: include: a fifth receiving module, configured to receive second information from a previous-hop relay terminal of the first relay terminal, wherein the second information includes a valid version of at least one SIB type and at least one of the following: a terminal identifier of a remote terminal and a terminal identifier of a second relay terminal; A third sending module, configured to send the second information to the remote terminal or a next-hop relay terminal of the first relay terminal; The second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

30. A communication processing device, applied to a third relay terminal, wherein: include: The sixth receiving module is configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

31. A communication processing device, applied to a fourth relay terminal, wherein: include: The fifth sending module is used to send the first system information to a third relay terminal or a remote terminal, and the fourth relay terminal is a parent relay terminal of the third relay terminal.

32. A communication system, wherein: The communication system includes a remote terminal, a first relay terminal and a second relay terminal; The remote terminal is used to perform the method according to any one of claims 9 to 12, the second relay terminal is used to perform the steps of the method according to any one of claims 13 to 16, and the first relay terminal is used to perform the steps of the method according to any one of claims 1 to 8, or the steps of the method according to any one of claims 17 to 20; or, The communication system includes a third relay terminal and a fourth relay terminal, the third relay terminal is used to execute the method according to claim 21 or 22, and the fourth relay terminal is used to execute the method according to claim 23 or 24.

33. A terminal, wherein: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction implements the steps of the method according to any one of claims 1 to 24 when executed by the processor.

34. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor of the terminal, the steps of the method according to any one of claims 1 to 24 are implemented.

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