Communication processing methods and apparatuses, and device and readable storage medium

Abstract

Disclosed in the present application are communication processing methods and apparatuses, and a device and a readable storage medium. A method comprises: a remote UE receiving a first discovery message sent by a previous-hop relay UE; the remote UE determining a serving cell of the remote UE on the basis of the first discovery message, wherein the serving cell of the remote UE comprises a serving cell of a first relay UE or a serving cell of a second relay UE, the first relay UE being a relay UE which is directly connected to a base station, and the second relay UE being the farthest relay UE which is reachable by the remote UE via a PC5 connection; and when the serving cell of the first relay UE or the serving cell of the second relay UE is located outside an RNA of the remote UE, the remote UE executing an RNA update process, or, when the serving cell of the first relay UE or the serving cell of the second relay UE is located outside a TA of the remote UE, the remote UE executing a TA update process.

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 202311643519.7 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, New Radio (NR) only supports single-hop UE-to-Network (U2N) relaying, with only one relay UE. Related technologies dictate that the remote UE's serving cell follows the serving cell of the relay UE connected to its PC5. Therefore, the remote UE can simply use changes in the relay UE's serving cell to determine whether it has moved out of its RNA (Radio Notification Area) / TA (Tracking Area) configuration. However, with multi-hop U2N relaying, where two or more relay UEs are involved, how the remote UE executes the RNA update (RNAU) and TA update (TAU) processes is a pressing issue. 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 performs RNAU and TAU procedures in a multi-hop U2N relay scenario.

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

[0007] The remote terminal receives a first discovery message sent by the previous-hop relay terminal;

[0008] The remote terminal determines, according to the first discovery message, a serving cell of the remote terminal;

[0009] The serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5;

[0010] In the case where the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal, the remote terminal executes the RNA update process; or, in the case where the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal, the remote terminal executes the TA update process.

[0011] In a second aspect, a communication processing method is provided, comprising:

[0012] The third relay terminal receives the second discovery message sent by the previous-hop relay terminal;

[0013] The third relay terminal sends a third discovery message to the next-hop relay terminal, or the third relay terminal sends a first discovery message to the remote terminal;

[0014] Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

[0015] According to a third aspect, a communication processing method is provided, comprising:

[0016] The first relay terminal sends a fourth discovery message to the next-hop relay terminal, where the fourth discovery message includes the service cell access information of the first relay terminal, where the service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs, and the first relay terminal is a relay terminal directly connected to the base station.

[0017] In a fourth aspect, a communication processing device is provided, applied to a remote terminal, comprising:

[0018] A first receiving module, configured to receive a first discovery message sent by a previous-hop relay terminal;

[0019] A first determining module, configured to determine a serving cell of the remote terminal according to the first discovery message;

[0020] The serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5;

[0021] The first processing module is used to execute the RNA update process when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal; or to execute the TA update process when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal.

[0022] In a fifth aspect, a communication processing device is provided, applied to a third relay terminal, including:

[0023] A second receiving module is used to receive a second discovery message sent by the previous hop relay terminal;

[0024] A first sending module, configured to send a third discovery message to a next-hop relay terminal, or send a first discovery message to a remote terminal;

[0025] Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

[0026] In a sixth aspect, a communication processing device is provided, applied to a first relay terminal, including:

[0027] The second sending module is used to send a fourth discovery message to the next-hop relay terminal, where the fourth discovery message includes the service cell access information of the first relay terminal, and the service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs. The first relay terminal is a relay terminal directly connected to the base station.

[0028] In the seventh 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, or the third aspect.

[0029] In an eighth aspect, a communication system is provided, comprising a remote terminal, a first relay terminal, and a third relay terminal;

[0030] The remote terminal is used to execute the method described in the first aspect, the first relay terminal is used to execute the method described in the third aspect, and the third relay terminal is used to execute the method described in the second aspect.

[0031] In the ninth 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, or the third aspect are implemented.

[0032] In the tenth 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, the second aspect, or the third aspect.

[0033] In the eleventh aspect, a computer program / program product is provided, which is stored in a non-volatile storage medium and is executed by at least one processor to implement the steps of the method described in the first aspect, the second aspect, or the third aspect.

[0034] In an embodiment of the present application, the remote terminal may determine the service cell of the first relay terminal or the service cell of the second relay terminal as the service cell of the remote terminal; when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal, the remote terminal executes the RNA update process; or, when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal, the remote terminal executes the TA update process, wherein the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5. By clarifying the service cell of the remote terminal in the multi-hop U2N relay scenario, it is possible to trigger the remote terminal to execute the RNA update or TA update process in the multi-hop U2N relay scenario, thereby avoiding the problem that the remote terminal is in a deep coverage hole and cannot be reached by the network downlink. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of UE-to-Network relay;

[0036] FIG2 is a schematic diagram of the RNAU / TAU process of the Remote UE in a single-hop scenario;

[0037] Figures 3a and 3b are diagrams showing the definition of multi-hop L2U2N relay network terms;

[0038] FIG4 is a schematic diagram of the architecture of a wireless communication system according to an embodiment of the present application;

[0039] FIG5 is a flow chart of a communication processing method according to an embodiment of the present application;

[0040] FIG6 is a second flowchart of the communication processing method provided in an embodiment of the present application;

[0041] FIG7 is a third flowchart of the communication processing method provided in an embodiment of the present application;

[0042] FIG8 is a flowchart of a communication processing method according to an embodiment of the present application;

[0043] FIG9 is a second flowchart of the communication processing method provided in an embodiment of the present application;

[0044] FIG10 is a flowchart of a third communication processing method provided in an embodiment of the present application;

[0045] FIG11 is a fourth flowchart of the communication processing method provided in an embodiment of the present application;

[0046] FIG12 is a schematic diagram of a communication processing device according to an embodiment of the present application;

[0047] FIG13 is a second schematic diagram of a communication processing device provided in an embodiment of the present application;

[0048] FIG14 is a third schematic diagram of a communication processing device provided in an embodiment of the present application;

[0049] FIG15 is a schematic diagram of a terminal according to an embodiment of the present application;

[0050] FIG16 is a second schematic diagram of the terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 1. About the Sidelink (SL) Relay Mechanism.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 2. Single-hop scenario: RAN-based Notification Area Update (RNAU) or Tracking Area Update (TAU) process of the Remote UE.

[0062] Referring to Figure 2, the specific steps are as follows:

[0063] Step 0: PC5 connection is established between Remote UE and Relay UE.

[0064] Step 1: The Relay UE sends a discovery message to the Remote UE. The discovery message includes the Relay UE serving cell access information.

[0065] Step 2: The Remote UE determines whether the Relay UE serving cell is moved out of the Remote UE's RAN or TA configuration.

[0066] Step 3: When the Relay UE serving cell is removed from the Remote UE's RAN or TA configuration, perform the RNAU or TAU procedure.

[0067] TA configuration: A list consisting of at least one Tracking Area Identity (TAI), where a TAI includes a Tracking Area Code (TAC) and a Public Land Mobile Network (PLMN) identity.

[0068] RNA configuration: There are two ways to configure RNA:

[0069] Method 1: A list consisting of at least one cell identity;

[0070] Method 2: A list consisting of at least one radio access network area identifier (RAN area ID); one RAN area ID = PLMN + TAC, or one RAN area ID = PLMN + TAC + radio access network notification area code (RAN Notification Area Code, RNAC).

[0071] Among them, the region size of the RNA configuration is a subset of the TA configuration, and its maximum region is equal to the TA configuration.

[0072] 3. Definition of terms regarding multi-hop relay networks:

[0073] For ease of understanding and description, in this embodiment, the multi-hop Layer 2 (L2) U2N relay network is referred to as a multi-hop relay network. With respect to the remote UE in FIG3a and FIG3b , the relay categories therein are defined as follows:

[0074] (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;

[0075] Optionally, the host relay UE may include but is not limited to one of the following: 1) a Relay UE that undertakes PC5hop+Uu hop; 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.

[0076] (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.

[0077] (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 the access relay UE and the 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 3b.

[0078] 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.

[0079] (4) Downstream UE: All UEs that access the network through a relay UE become downstream UEs of the relay UE.

[0080] 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.

[0081] (5) Upstream UE: A relay UE that forwards uplink and downlink data and signaling for a UE is the upstream UE of the UE.

[0082] 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.

[0083] In the downlink direction, the intermediate relay UE or the intermediate relay UE is the upstream UE of the donor relay UE.

[0084] (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.

[0085] 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.

[0086] 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.

[0087] FIG4 shows a block diagram of a wireless communication system applicable to embodiments of the present application. The wireless communication system includes a terminal 41 and a network-side device 42 .

[0088] The terminal 41 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. Among them, the vehicle-mounted device can also be called 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, etc. In addition to the above-mentioned terminal devices, the terminal involved in this application can 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 41 is not limited in the embodiments of this application.

[0089] The network-side device 42 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.

[0090] 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 ( Function, AF), etc. 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.

[0091] 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.

[0092] 5 , an embodiment of the present application provides a communication processing method, which is applied to a remote terminal (Remote UE), and the specific steps include: step 501 , step 502 and step 503 .

[0093] Step 501: The remote terminal receives a first discovery message sent by the previous-hop relay terminal;

[0094] Taking FIG. 3 a as an example, the previous-hop relay terminal of the remote terminal may be an access relay UE.

[0095] Step 502: The remote terminal determines a serving cell of the remote terminal according to the first discovery message;

[0096] The serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5;

[0097] Taking FIG. 3 a as an example, the first relay terminal is a host relay UE.

[0098] In this embodiment, the "relay terminal with the farthest reachable by the remote terminal PC5" refers to the relay terminal with which the remote terminal can establish the farthest connection (which can be understood as the relay terminal with the most hops) through the PC5 interface. The "farthest" does not mean that the physical distance between the relay terminal and the remote terminal is the farthest. The "farthest" can be understood as that the number of PC5 hops between the relay terminal and the remote terminal is greater than the number of PC5 hops between other relay terminals and the remote terminals.

[0099] Taking Figure 3a as an example, assuming that the remote UE establishes a PC5 connection with the access relay UE, the access relay UE establishes a PC5 connection with the intermediate relay UE, and the intermediate relay UE does not establish a PC5 connection with the host relay UE. The PC5 hop number between the access relay UE and the remote UE is 1, and the PC5 hop number between the intermediate relay UE and the remote UE is 2. Then the farthest relay UE that the remote UE PC5 connection can reach is the intermediate relay UE.

[0100] In this embodiment, determining the serving cell of the second relay terminal as the serving cell of the remote terminal can better meet the power saving requirements of the relay terminal. Specifically, when the Remote UE has no business transmission and is in the radio resource control idle state (RRC_IDLE) or the radio resource control inactive state (RRC_INACTIVE), the PC5RRC connection of some Relay UEs serving the Remote UE can be temporarily not established, or the established PC5RRC connection can be released (for example, there is no PC5RRC connection between Relay UE2 and Relay UE3 in Figure 11, and there is no PC5RRC connection between Relay UE3 and Relay UE 4), which is beneficial to energy saving of these Relay UEs. Until the Remote UE meets the conditions for executing the RANU or TAU process, the PC5RRC connection of the aforementioned Relay UE is established or re-established, thereby establishing a multi-hop relay forwarding link, so that the Remote UE can continue to execute the RANU or TAU process.

[0101] Step 503: When the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal, the remote terminal executes the RNA update process; or, when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal, the remote terminal executes the TA update process.

[0102] In one embodiment of the present application, the first discovery message includes first serving cell access information of the first relay terminal, and the first serving cell access information includes at least one of a public land mobile network identifier, a cell identifier, a TAC, and an RNAC to which the serving cell belongs.

[0103] Taking FIG. 3 a as an example, the first discovery message includes the serving cell access information of the host relay UE.

[0104] In one embodiment of the present application, the first discovery message includes the second service cell access information of the previous hop relay terminal of the remote terminal and the first service cell access information of the first relay terminal, and the first service cell access information or the second service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0105] Taking FIG. 3 a as an example, the first discovery message includes the serving cell access information of the access relay UE and the serving cell access information of the donor relay UE.

[0106] In one embodiment of the present application, the first discovery message includes a service cell access information list, the service cell access information list includes the first service cell access information of the first relay terminal, and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the previous hop relay terminal of the remote terminal, the first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0107] Taking Figure 3a as an example, all relay terminals on the relay forwarding link between the first relay terminal and the previous-hop relay terminal of the remote terminal include: host relay UE, intermediate relay UE, and access relay UE. The service cell access information list included in the first discovery message includes the first service cell access information of the first relay terminal (the service cell access information of the host relay UE), and the service cell access information of other relay terminals (the service cell access information of the intermediate relay UE, the service cell access information of the access relay UE).

[0108] In one embodiment of the present application, the remote terminal determining, according to the first discovery message, a serving cell of the remote terminal, includes:

[0109] The remote terminal determines, based on the serving cell access information list in the first discovery message, that the farthest reachable relay terminal to which the remote terminal PC5 is connected is the second relay terminal;

[0110] The remote terminal determines that the serving cell of the remote terminal is the serving cell of the second relay terminal.

[0111] In one embodiment of the present application, the order of the first service cell access information of the first relay terminal and the service cell access information of the other relay terminals in the service cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals. For example, the relay forwarding order can be the order of forwarding discovery messages.

[0112] Taking Figure 3a as an example, the relay forwarding order of the host relay UE and the other relay UEs is: host relay UE - intermediate relay UE - access relay UE. Therefore, the service cell access information list included in the first discovery message includes the service cell access information of the host relay UE, the service cell access information of the intermediate relay UE, and the service cell access information of the access relay UE in sequence.

[0113] In the embodiment of the present application, by clarifying the service cell of the remote terminal in the multi-hop U2N relay scenario, the remote terminal can execute the RNA update or TA update process in the multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage hole and cannot be reached by the network downlink.

[0114] 6 , an embodiment of the present application provides a communication processing method, which is applied to a third relay terminal. The specific steps include: step 601 and step 602 .

[0115] Step 601: The third relay terminal receives a second discovery message sent by the previous-hop relay terminal;

[0116] Step 602: The third relay terminal sends a third discovery message to the next-hop relay terminal, or the third relay terminal sends a first discovery message to the remote terminal;

[0117] Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

[0118] Taking Figure 3a as an example, the third relay terminal can be an intermediate relay UE, the next-hop relay terminal of the third relay terminal can be an access relay UE, and the previous-hop relay terminal of the third relay terminal is a host relay terminal, or the third relay terminal can be an access relay UE, and the previous-hop relay terminal of the third relay terminal is an intermediate relay UE.

[0119] In one embodiment of the present application, the third relay terminal sends the first discovery message to the remote terminal, including:

[0120] If the measurement result of the measurement amount corresponding to the first discovery message is greater than or equal to a first preset value, the third relay terminal sends the first discovery message to the remote terminal.

[0121] Optionally, the measurement quantity includes but is not limited to Sidelink Discovery Signal-Reference Signal Receiving Power (SD-RSRP).

[0122] It can be understood that, in this embodiment, the first preset value is not specifically limited.

[0123] In one embodiment of the present application, the first discovery message includes the first serving cell access information of the first relay terminal, including:

[0124] The first discovery message includes the first service cell access information of the first relay terminal and the fourth service cell access information of the third relay terminal. The first service cell access information or the fourth service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0125] Taking FIG. 3 a as an example, the first discovery message includes the serving cell access information of the host relay UE and the serving cell access information of the access relay UE.

[0126] In one embodiment of the present application, the first discovery message includes the first serving cell access information of the first relay terminal, including:

[0127] The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0128] Taking Figure 3a as an example, all relay terminals on the relay forwarding link between the first relay terminal and the previous hop relay terminal of the remote terminal include: host relay UE, intermediate relay UE, and access relay UE. The service cell access information list included in the first discovery message includes the service cell access information of the host relay UE, the service cell access information of the intermediate relay UE, and the service cell access information of the access relay UE.

[0129] In one embodiment of the present application, the third relay terminal sending the third discovery message to the next-hop relay terminal includes:

[0130] If the measurement result of the measurement amount corresponding to the third discovery message is greater than or equal to a second preset value, the third relay terminal sends the third discovery message to the next-hop relay terminal.

[0131] It can be understood that in this embodiment, the second preset value is not specifically limited.

[0132] In one embodiment of the present application, the third discovery message includes the first serving cell access information of the first relay terminal, including:

[0133] The third discovery message includes the first service cell access information of the first relay terminal and the fourth service cell access information of the third relay terminal. The first service cell access information or the fourth service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0134] Taking FIG. 3 a as an example, the third discovery message includes the serving cell access information of the host relay terminal and the serving cell access information of the intermediate relay UE.

[0135] In one embodiment of the present application, the third discovery message includes the first serving cell access information of the first relay terminal, including:

[0136] The third discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0137] Taking FIG. 3 a as an example, the third discovery message includes a serving cell access information list, and the serving cell access information list includes the serving cell access information of the host relay terminal and the serving cell access information of the intermediate relay UE.

[0138] In one embodiment of the present application, the order of the first serving cell access information of the first relay terminal and the serving cell access information of the other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals.

[0139] Taking Figure 3a as an example, the service cell access information list included in the first discovery message includes the service cell access information of the host relay UE, the service cell access information of the intermediate relay UE, and the service cell access information of the access relay UE in sequence, that is, the service cell access information in the service cell access information list is set according to the relay forwarding order of the relay terminal on the relay forwarding link.

[0140] In one embodiment of the present application, the previous-hop relay terminal of the third relay terminal is the first relay terminal, or the previous-hop relay terminal of the third relay terminal is any relay terminal other than the first relay terminal.

[0141] In an embodiment of the present application, by clarifying that the remote terminal in the multi-hop U2N relay scenario can determine the service cell of the first relay terminal or the service cell of the second relay terminal as the service cell of the remote terminal, the remote terminal can then execute the RNA update or TA update process in the multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage hole and cannot be reached by the network downlink.

[0142] 7 , an embodiment of the present application provides a communication processing method, which is applied to a first relay terminal, and the specific steps include: Step 701 .

[0143] Step 701: The first relay terminal sends a fourth discovery message to the next-hop relay terminal, where the fourth discovery message includes the service cell access information of the first relay terminal, where the service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs. The first relay terminal is a relay terminal directly connected to the base station.

[0144] Taking FIG3a as an example, the first relay terminal is a host relay UE, and the next-hop relay terminal of the first relay terminal is an intermediate relay terminal.

[0145] It can be understood that if the third relay terminal in the embodiment shown in Figure 6 is the next-hop relay terminal of the first relay terminal, the fourth discovery message and the second discovery message are the same discovery message, that is, the first relay terminal sends the fourth discovery message (that is, the second discovery message) to the third relay terminal.

[0146] In one embodiment of the present application, the serving cell access information of the first relay terminal in the fourth discovery message is used to determine the serving cell of the remote terminal.

[0147] In an embodiment of the present application, by clarifying that the remote terminal in the multi-hop U2N relay scenario can determine the service cell of the first relay terminal or the service cell of the second relay terminal as the service cell of the remote terminal, the remote terminal can then execute the RNA update or TA update process in the multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage hole and cannot be reached by the network downlink.

[0148] The implementation of this application is described below with reference to embodiments.

[0149] Implementation method 1: It is stipulated that the serving cell of the Remote UE follows the Donor Relay UE.

[0150] Discovery method 1: The content of the Discovery message is set to Donor Relay UE serving cell access information.

[0151] In discovery method 1, Remote UE is a remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0152] As shown in Figure 8, the specific steps are as follows:

[0153] Step 800 (prerequisite): Remote UE establishes a PC5RRC connection with Relay UE-1, Relay UE-1 establishes a PC5RRC connection with Relay UE-2, Relay UE-2 establishes a PC5RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5RRC connection with Relay UE-4.

[0154] Step 801: Relay UE-4 (i.e., Donor Relay UE) broadcasts a Discovery message, which includes the serving cell access information of Relay UE-4. The serving cell access information includes at least the PLMN ID, Cell ID, TAC, and RNAC of the serving cell of Relay UE-4.

[0155] For example, in step 801 , Relay UE- 4 is the first relay terminal, Relay UE- 3 is the next-hop relay terminal of the first relay terminal, and the broadcasted Discovery message is the fourth discovery message.

[0156] Step 802: Relay UE-3 receives a Discovery message from Relay UE-4 (ie, Donor Relay UE) and forwards the Discovery message.

[0157] For example, Relay UE-3 in step 802 is the third relay terminal, Relay UE-4 is the previous-hop relay terminal of the third relay terminal, and the Discovery message is the second discovery message.

[0158] In step 802, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP corresponding to the Discovery message, and if the SD-RSRP measurement result is greater than a preset SD-RSRP threshold value, then the condition is determined to be satisfied.

[0159] Step 803: Relay UE-2 receives the Discovery message from Relay UE-3 and forwards the Discovery message.

[0160] For example, Relay UE-2 in step 803 is the third relay terminal, Relay UE-3 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-2 from Relay UE-3 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0161] In step 803, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0162] Step 804: Relay UE-1 receives the Discovery message from Relay UE-2 and forwards the Discovery message.

[0163] For example, Relay UE-1 in step 804 is the third relay terminal, Relay UE-2 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-1 is the second discovery message, and the Discovery message forwarded by Relay UE-1 is the first discovery message.

[0164] In step 804, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0165] Step 805: The Remote UE receives the Discovery message from Relay UE-1. Based on the serving cell access information of Relay UE-4 contained in the Discovery message, the Remote UE determines whether the serving cell of Relay UE-4 is outside the RNA or TA configuration of the Remote UE. If so, the RNAU or TAU process is executed.

[0166] For example, the Discovery message received by the Remote UE is the first discovery message.

[0167] Discovery Method 2: The Discovery message contains content that sets two serving cell access information: one is defined as the Donor Relay UE's serving cell access information, and the other is defined as the current Relay UE's own serving cell access information. It is understood that in related art, the current Relay UE sends its own serving cell access information to the next-hop Relay UE via a Discovery message. However, in this embodiment, the Discovery message contains content that sets two serving cell access information. Thus, the Discovery message in this embodiment is compatible with the Discovery message in related art. Furthermore, the inclusion of two serving cell access information in the Discovery message in this embodiment enables the next-hop Relay UE to determine the network topology.

[0168] In discovery method 2, Remote UE is a remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0169] As shown in Figure 9, the specific steps are as follows:

[0170] Step 900 (prerequisite): Remote UE establishes a PC5RRC connection with Relay UE-1, Relay UE-1 establishes a PC5RRC connection with Relay UE-2, Relay UE-2 establishes a PC5RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5RRC connection with Relay UE-4.

[0171] Step 901: Relay UE-4 (i.e., Donor Relay UE) broadcasts a Discovery message, which includes the serving cell access information of Relay UE-4. The serving cell access information includes at least the PLMN ID, Cell ID, TAC, and RNAC of the serving cell of Relay UE-4.

[0172] For example, Relay UE-4 in step 901 is the first relay terminal, Relay UE-3 is the next-hop relay terminal of the first relay terminal, and the broadcasted Discovery message is the fourth discovery message.

[0173] Step 902: Relay UE-3 receives a Discovery message from Relay UE-4 (i.e., Donor Relay UE), sets the Discovery message content to two serving cell access information, one of which is the serving cell access information of the Donor Relay UE, and the other is the serving cell access information of Relay UE-3 (i.e., including the serving cell access information of Relay UE-4 and Relay UE-3), and forwards the Discovery message.

[0174] For example, Relay UE-3 in step 902 is the third relay terminal, Relay UE-4 is the previous-hop relay terminal of the third relay terminal, and the Discovery message is the second discovery message.

[0175] In step 902, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP corresponding to the Discovery message, and if the SD-RSRP measurement result is greater than a preset SD-RSRP threshold value, the condition is determined to be satisfied.

[0176] Step 903: Relay UE-2 receives the Discovery message from Relay UE-3, sets the content of the Discovery message to two serving cell access information, one of which is the serving cell access information of the Donor Relay UE, and the other is the serving cell access information of Relay UE-2 (i.e., including the serving cell access information of Relay UE-4 and Relay UE-2), and forwards the Discovery message.

[0177] For example, Relay UE-2 in step 903 is the third relay terminal, Relay UE-3 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-2 from Relay UE-3 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0178] In step 903, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0179] Step 904: Relay UE-1 receives the Discovery message from Relay UE-2, sets the Discovery message content to two serving cell access information, one specified as the serving cell access information of the Donor Relay UE, and the other specified as the serving cell access information of Relay UE-1 (i.e., Relay UE-4, Relay UE-1), and forwards the Discovery message.

[0180] For example, Relay UE-1 in step 904 is the third relay terminal, Relay UE-2 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-1 is the second discovery message, and the Discovery message forwarded by Relay UE-1 is the first discovery message.

[0181] In step 904, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0182] Step 905: The Remote UE receives the Discovery message from Relay UE-1 and determines whether the serving cell of Relay UE-4 is outside the RNA or TA configuration of the Remote UE based on the serving cell access information of Relay UE-4 in the Discovery message. If so, the RNAU or TAU process is executed.

[0183] For example, the Discovery message received by the Remote UE is the first discovery message.

[0184] Discovery method 3: The Discovery message contains content to set a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded.

[0185] In discovery method 3, Remote UE is a remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0186] As shown in Figure 10, the specific steps are as follows:

[0187] Step 1000 (prerequisite): Remote UE establishes a PC5RRC connection with Relay UE-1, Relay UE-1 establishes a PC5RRC connection with Relay UE-2, Relay UE-2 establishes a PC5RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5RRC connection with Relay UE-4.

[0188] Step 1001: Relay UE-4 (i.e., Donor Relay UE) broadcasts a Discovery message, wherein the Discovery message content includes the serving cell access information of Relay UE-4, wherein the serving cell access information at least includes the PLMN ID, Cell ID, TAC, and RNAC of the serving cell of the Relay UE-4.

[0189] For example, Relay UE-4 in step 1001 is the first relay terminal, Relay UE-3 is the next-hop relay terminal of the first relay terminal, and the broadcasted Discovery message is the fourth discovery message.

[0190] Step 1002: Relay UE-3 receives a Discovery message from Relay UE-4 (i.e., Donor Relay UE), sets the Discovery message content into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded (i.e., Relay UE-4, Relay UE-3), and forwards the Discovery message.

[0191] For example, Relay UE-3 in step 1002 is the third relay terminal, Relay UE-4 is the previous-hop relay terminal of the third relay terminal, and the Discovery message is the second discovery message.

[0192] In step 1002, forwarding the Discovery message is optionally performed on the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP corresponding to the Discovery message, and if the SD-RSRP measurement result is greater than a preset SD-RSRP threshold value, then the condition is determined to be satisfied.

[0193] Step 1003: Relay UE-2 receives the Discovery message from Relay UE-3, sets the content of the Discovery message into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded (i.e., the serving cell access information list includes the serving cell access information of Relay UE-4, Relay UE-3, and Relay UE-2 in sequence), and forwards the Discovery message.

[0194] For example, Relay UE-2 in step 1003 is the third relay terminal, Relay UE-3 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-2 from Relay UE-3 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0195] In step 1003, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0196] Step 1004: Relay UE-1 receives the Discovery message from Relay UE-2, sets the content of the Discovery message into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded (i.e., the serving cell access information list includes the serving cell access information of Relay UE-4, Relay UE-3, Relay UE-2, and Relay UE-1 in sequence), and forwards the Discovery message.

[0197] For example, Relay UE-1 in step 1004 is the third relay terminal, Relay UE-2 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-1 is the second discovery message, and the Discovery message forwarded by Relay UE-1 is the first discovery message.

[0198] In step 1004, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0199] Step 1005: The Remote UE receives the Discovery message from Relay UE-1. Based on the serving cell access information of Relay UE-4 contained in the Discovery message, the Remote UE determines whether the serving cell of Relay UE-4 is outside the RNA or TA configuration of the Remote UE. If so, the RNAU or TAU process is executed.

[0200] For example, the Discovery message received by the Remote UE is the first discovery message.

[0201] Implementation method 2: It is stipulated that the serving cell of the Remote UE is the serving cell of the intermediate Relay UE (Intermediate Relay UE) that is connected to the farthest reachable by PC5.

[0202] For example, the number of Relay UEs N=4, as shown in Figure 11. Intermediate Relay UEs include Relay UE 1, Relay UE 2, and Relay UE 3, and the farthest reachable Intermediate Relay UE connected to PC5 is Relay UE 2.

[0203] Discovery method 4: The Discovery message contains a content to set a serving cell access information list. The serving cell access information of each serving cell in the list is set in the order of the Relay UE through which the Discovery message is forwarded.

[0204] In discovery method 4, Remote UE is a remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0205] Referring to Figure 11, the specific steps are as follows:

[0206] Step 1100 (prerequisite): Remote UE establishes a PC5 RRC connection with Relay UE-1, and Relay UE-1 establishes a PC5 RRC connection with Relay UE-2.

[0207] According to step 1100 , it can be concluded that the longest reachable intermediate relay UE connected to PC5 of the remote UE is relay UE 2 .

[0208] Step 1101: Relay UE-4 (ie, Donor Relay UE) broadcasts a Discovery message, wherein the content of the Discovery message includes the serving cell access information of the Donor Relay UE, wherein the serving cell access information at least includes the PLMN ID, Cell ID, TAC, and RNAC to which the serving cell belongs.

[0209] For example, in step 1101 , Relay UE- 4 is the first relay terminal, Relay UE- 3 is the next-hop relay terminal of the first relay terminal, and the broadcasted Discovery message is the fourth discovery message.

[0210] Step 1102: Relay UE-3 receives the Discovery message from Relay UE-4 (i.e., Donor Relay UE), sets the content of the Discovery message into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded, and then forwards the Discovery message.

[0211] For example, Relay UE-3 in step 1102 is the third relay terminal, Relay UE-4 is the previous-hop relay terminal of the third relay terminal, and the Discovery message is the second discovery message.

[0212] In step 1102, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP corresponding to the Discovery message, and if the SD-RSRP measurement result is greater than a preset SD-RSRP threshold value, the condition is determined to be satisfied.

[0213] Step 1103: Relay UE-2 receives the Discovery message from Relay UE-3, sets the content of the Discovery message into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded (i.e., the serving cell access information list includes the serving cell access information of Relay UE-4, Relay UE-3, and Relay UE-2 in sequence), and forwards the Discovery message.

[0214] For example, Relay UE-2 in step 1103 is the third relay terminal, Relay UE-3 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-2 from Relay UE-3 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0215] In step 1103, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0216] Step 1104: Relay UE-1 receives the Discovery message from Relay UE-2, sets the content of the Discovery message into a serving cell access information list. Each serving cell access information in the list is set in the order of the Relay UEs through which the Discovery message is forwarded (i.e., the serving cell access information list includes the serving cell access information of Relay UE-4, Relay UE-3, Relay UE-2, and Relay UE-1 in sequence), and forwards the Discovery message.

[0217] For example, Relay UE-1 in step 1104 is the third relay terminal, Relay UE-2 is the previous-hop relay terminal of the third relay terminal, the Discovery message received by Relay UE-1 is the second discovery message, and the Discovery message forwarded by Relay UE-1 is the first discovery message.

[0218] In step 1104, forwarding the Discovery message is optionally performed under the premise that a PC5 threshold condition is satisfied. The method for determining whether the PC5 threshold condition is satisfied is to measure the SD-RSRP result corresponding to the Discovery message and determine that the condition is satisfied if the SD-RSRP result is greater than a preset SD-RSRP threshold value.

[0219] Step 1105: The Remote UE receives the Discovery message from Relay UE-1. Based on the serving cell access information of the longest reachable Intermediate Relay UE (i.e., Relay UE-2) connected to the Remote UE's PC5 contained in the Discovery message, the Remote UE determines whether the serving cell of Relay UE-2 is outside the Remote UE's RNA or TA configuration. If so, the RNAU or TAU process is executed.

[0220] For example, the Discovery message received by the Remote UE is the first discovery message.

[0221] Referring to FIG. 12 , an embodiment of the present application provides a communication processing device, applied to a remote terminal (Remote UE), including:

[0222] The first receiving module 1201 is configured to receive a first discovery message sent by a previous-hop relay terminal;

[0223] A first determining module 1202 is configured to determine a serving cell of the remote terminal according to the first discovery message;

[0224] The serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5;

[0225] The first processing module 1203 is used to, when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal, the remote terminal executes the RNA update process; or, when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal, the remote terminal executes the TA update process.

[0226] In one embodiment of the present application, the first discovery message includes the first service cell access information of the first relay terminal, and the first service cell access information includes at least one of the public land mobile network identifier, cell identifier, tracking area code (TAC), and radio access network notification area code (RNAC) to which the service cell belongs.

[0227] In one embodiment of the present application, the first discovery message includes the second service cell access information of the previous hop relay terminal of the remote terminal and the first service cell access information of the first relay terminal, and the first service cell access information or the second service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0228] In one embodiment of the present application, the first discovery message includes a service cell access information list, the service cell access information list includes the first service cell access information of the first relay terminal, and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the previous hop relay terminal of the remote terminal, the first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0229] In one embodiment of the present application, the first determination module 1202 is further used to: determine that the farthest reachable relay terminal connected to the remote terminal PC5 is the second relay terminal according to the service cell access information list in the first discovery message; and determine that the service cell of the remote terminal is the service cell of the second relay terminal.

[0230] In one embodiment of the present application, the order of the first serving cell access information of the first relay terminal and the serving cell access information of the other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals.

[0231] The device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 5 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0232] 13 , an embodiment of the present application provides a communication processing device, which is applied to a third relay terminal. The device 1300 includes:

[0233] The second receiving module 1301 is configured to receive a second discovery message sent by the previous hop relay terminal;

[0234] The first sending module 1302 is configured to send a third discovery message to a next-hop relay terminal, or send a first discovery message to a remote terminal;

[0235] Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

[0236] In one embodiment of the present application, the first sending module 1302 is further configured to: send the first discovery message to the remote terminal when the measurement result of the measurement quantity corresponding to the first discovery message is greater than or equal to a first preset value.

[0237] In one embodiment of the present application, the first discovery message includes the first serving cell access information of the first relay terminal, including:

[0238] The first discovery message includes the first service cell access information of the first relay terminal and the fourth service cell access information of the third relay terminal. The first service cell access information or the fourth service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0239] In one embodiment of the present application, the first discovery message includes the first serving cell access information of the first relay terminal, including:

[0240] The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0241] In one embodiment of the present application, the first sending module 1302 is further configured to: send the third discovery message to the next-hop relay terminal if the measurement result of the measurement amount corresponding to the third discovery message is greater than or equal to a second preset value.

[0242] In one embodiment of the present application, the third discovery message includes the first serving cell access information of the first relay terminal, including:

[0243] The third discovery message includes the first service cell access information of the first relay terminal and the fourth service cell access information of the third relay terminal. The first service cell access information or the fourth service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0244] In one embodiment of the present application, the third discovery message includes the first serving cell access information of the first relay terminal, including:

[0245] The third discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals other than the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0246] In one embodiment of the present application, the order of the first serving cell access information of the first relay terminal and the serving cell access information of the other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals.

[0247] In one embodiment of the present application, the previous-hop relay terminal of the third relay terminal is the first relay terminal, or the previous-hop relay terminal of the third relay terminal is any relay terminal other than the first relay terminal.

[0248] 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.

[0249] 14 , an embodiment of the present application provides a communication processing device, which is applied to a first relay terminal. The device 1400 includes:

[0250] The second sending module 1401 is used to send a fourth discovery message to the next-hop relay terminal, where the fourth discovery message includes the service cell access information of the first relay terminal, and the service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs. The first relay terminal is a relay terminal directly connected to the base station.

[0251] In one embodiment of the present application, the serving cell access information of the first relay terminal in the fourth discovery message is used to determine the serving cell of the remote terminal.

[0252] 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.

[0253] FIG15 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application. The terminal 1500 includes, but is not limited to, at least some of the components including a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, and a processor 1510.

[0254] Those skilled in the art will appreciate that the terminal 1500 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 1510 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG15 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0255] It should be understood that in an embodiment of the present application, the input unit 1504 may include a graphics processing unit (GPU) 15041 and a microphone 15042, and the graphics processor 15041 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 1506 may include a display panel 15061, and the display panel 15061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1507 includes a touch panel 15071 and at least one of other input devices 15072. The touch panel 15071 is also called a touch screen. The touch panel 15071 may include two parts: a touch detection device and a touch controller. Other input devices 15072 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 a joystick, which will not be repeated here.

[0256] In the embodiment of the present application, after receiving downlink data from a network-side device, the radio frequency unit 1501 may transmit the data to the processor 1510 for processing. Furthermore, the radio frequency unit 1501 may send uplink data to the network-side device. Typically, the radio frequency unit 1501 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0257] The memory 1509 can be used to store software programs or instructions and various data. The memory 1509 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.), etc. In addition, the memory 1509 may include a volatile memory or a non-volatile memory, or the memory 1509 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 1509 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0258] Processor 1510 may include one or more processing units. Optionally, processor 1510 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 1510.

[0259] The terminal provided in the embodiment of the present application can implement the various processes implemented in the method embodiment of Figure 5 or Figure 6 or Figure 7, and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0260] As shown in Figure 16, an embodiment of the present application also provides a terminal 1600, including a processor 1601 and a memory 1602, and the memory 1602 stores a program or instruction that can be run on the processor 1601. When the program or instruction is executed by the processor 1601, it implements the various steps of the method embodiments of Figure 5 or Figure 6 or Figure 7 above and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0261] 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 5 or Figure 6 or Figure 7 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.

[0262] 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.

[0263] 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 5 or Figure 6 or Figure 7 and the various method embodiments mentioned above, and can achieve the same technical effect. To avoid repetition, they will not be repeated here.

[0264] 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.

[0265] 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 5 or Figure 6 or Figure 7 and the various method embodiments described above, and can achieve the same technical effects. To avoid repetition, they are not described here.

[0266] The embodiment of the present application further provides a communication system, comprising a remote terminal, a first relay terminal, and a third relay terminal;

[0267] The remote terminal is used to execute the method shown in FIG. 5 , the first relay terminal is used to execute the method shown in FIG. 7 , and the third relay terminal is used to execute the method shown in FIG. 6 .

[0268] The communication system includes a terminal and a network side device. The terminal is used to execute the various processes shown in Figure 5 or Figure 6 or Figure 7 and the various method embodiments mentioned above, and can achieve the same technical effects. To avoid repetition, they will not be described here.

[0269] 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.

[0270] 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.

[0271] 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 remote terminal receives a first discovery message sent by the previous-hop relay terminal; The remote terminal determines, according to the first discovery message, a serving cell of the remote terminal; The service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5; In a case where the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the radio access network notification area RNA of the remote terminal, the remote terminal executes the RNA update process; or, In a case where the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the tracking area TA of the remote terminal, the remote terminal performs a TA update procedure.

2. The method according to claim 1, wherein: The first discovery message includes first service cell access information of the first relay terminal, and the first service cell access information includes at least one of a public land mobile network identifier, a cell identifier, a tracking area code TAC, and a radio access network notification area code RNAC to which the service cell belongs.

3. The method according to claim 1, wherein: The first discovery message includes the second service cell access information of the previous hop relay terminal of the remote terminal and the first service cell access information of the first relay terminal. The first service cell access information or the second service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

4. The method according to claim 1, wherein: The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals except the first relay terminal on the relay forwarding link between the first relay terminal and the previous-hop relay terminal of the remote terminal, and the first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

5. The method according to claim 4, wherein: The remote terminal determining, according to the first discovery message, a serving cell of the remote terminal, includes: The remote terminal determines, according to the serving cell access information list in the first discovery message, that the farthest reachable relay terminal to which the remote terminal PC5 is connected is the second relay terminal; The remote terminal determines that the serving cell of the remote terminal is the serving cell of the second relay terminal.

6. The method according to claim 4, wherein: The order of the first serving cell access information of the first relay terminal and the serving cell access information of the other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals.

7. A communication processing method, wherein: include: The third relay terminal receives the second discovery message sent by the previous-hop relay terminal; The third relay terminal sends a third discovery message to the next-hop relay terminal, or the third relay terminal sends a first discovery message to the remote terminal; Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

8. The method according to claim 7, wherein: The third relay terminal sends a first discovery message to the remote terminal, including: If the measurement result of the measurement amount corresponding to the first discovery message is greater than or equal to a first preset value, the third relay terminal sends the first discovery message to the remote terminal.

9. The method according to claim 7, wherein: The first discovery message includes the first serving cell access information of the first relay terminal, including: The first discovery message includes first service cell access information of the first relay terminal and fourth service cell access information of the third relay terminal, and the first service cell access information or the fourth service cell access information includes at least one of a public land mobile network identifier, a cell identifier, a TAC, and an RNAC to which the service cell belongs.

10. The method according to claim 7, wherein: The first discovery message includes the first serving cell access information of the first relay terminal, including: The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals except the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

11. The method according to claim 7, wherein: The third relay terminal sends a third discovery message to the next-hop relay terminal, including: If the measurement result of the measurement amount corresponding to the third discovery message is greater than or equal to the second preset value, the third relay terminal sends the third discovery message to the next-hop relay terminal.

12. The method according to claim 7, wherein: The third discovery message includes the first serving cell access information of the first relay terminal, including: The third discovery message includes the first service cell access information of the first relay terminal and the fourth service cell access information of the third relay terminal, and the first service cell access information or the fourth service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

13. The method according to claim 7, wherein: The third discovery message includes the first serving cell access information of the first relay terminal, including: The third discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals except the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

14. The method according to claim 10 or 13, wherein: The order of the first serving cell access information of the first relay terminal and the serving cell access information of the other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and the other relay terminals.

15. The method according to claim 7, wherein: The previous-hop relay terminal of the third relay terminal is the first relay terminal, or the previous-hop relay terminal of the third relay terminal is any other relay terminal except the first relay terminal.

16. A communication processing method, wherein: include: The first relay terminal sends a fourth discovery message to the next-hop relay terminal, and the fourth discovery message includes service cell access information of the first relay terminal. The service cell access information includes at least one of a public land mobile network identifier, a cell identifier, a TAC, and an RNAC to which the service cell belongs. The first relay terminal is a relay terminal directly connected to a base station.

17. The method according to claim 16, wherein: The serving cell access information of the first relay terminal in the fourth discovery message is used to determine the serving cell of the remote terminal.

18. A communication processing device, applied to a remote terminal, wherein: include: A first receiving module, used to receive a first discovery message sent by a previous-hop relay terminal; A first determining module, configured to determine a serving cell of the remote terminal according to the first discovery message; The service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal connected to the remote terminal PC5; The first processing module is used to execute the RNA update process when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the RNA of the remote terminal; or to execute the TA update process when the service cell of the first relay terminal or the service cell of the second relay terminal is located outside the TA of the remote terminal.

19. The device according to claim 18, wherein: The first discovery message includes first service cell access information of the first relay terminal, and the first service cell access information includes at least one of a public land mobile network identifier, a cell identifier, a tracking area code TAC, and a radio access network notification area code RNAC to which the service cell belongs.

20. The device according to claim 18, wherein The first discovery message includes the second service cell access information of the previous hop relay terminal of the remote terminal and the first service cell access information of the first relay terminal. The first service cell access information or the second service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

21. The device according to claim 18, wherein The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals except the first relay terminal on the relay forwarding link between the first relay terminal and the previous-hop relay terminal of the remote terminal, and the first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

22. A communication processing device, applied to a third relay terminal, wherein: include: A second receiving module, used to receive a second discovery message sent by the previous hop relay terminal; A first sending module, used to send a third discovery message to a next-hop relay terminal, or send a first discovery message to a remote terminal; Among them, at least one of the second discovery message and the third discovery message includes the first service cell access information of the first relay terminal, the first discovery message is used to determine the service cell of the remote terminal, the service cell of the remote terminal includes the service cell of the first relay terminal or the service cell of the second relay terminal, the first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the farthest reachable relay terminal for the remote terminal PC5 to connect.

23. The device according to claim 22, wherein: The first discovery message includes the first serving cell access information of the first relay terminal, including: The first discovery message includes first service cell access information of the first relay terminal and fourth service cell access information of the third relay terminal, and the first service cell access information or the fourth service cell access information includes at least one of a public land mobile network identifier, a cell identifier, a TAC, and an RNAC to which the service cell belongs.

24. The device according to claim 22, wherein: The first discovery message includes the first serving cell access information of the first relay terminal, including: The first discovery message includes a service cell access information list, which includes the first service cell access information of the first relay terminal and the service cell access information of other relay terminals except the first relay terminal on the relay forwarding link between the first relay terminal and the third relay terminal. The first service cell access information or the service cell access information of other relay terminals includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

25. A communication processing device, applied to a first relay terminal, wherein: include: The second sending module is used to send a fourth discovery message to the next-hop relay terminal, wherein the fourth discovery message includes the service cell access information of the first relay terminal, and the service cell access information includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs, and the first relay terminal is a relay terminal directly connected to the base station.

26. 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, when executed by the processor, implements the steps of the method according to any one of claims 1 to 17.

27. A communication system, wherein: comprising a remote terminal, a first relay terminal and a third relay terminal; The remote terminal is used to execute the method according to any one of claims 1 to 7, the first relay terminal is used to execute the method according to claim 16 or 17, and the third relay terminal is used to execute the method according to any one of claims 8 to 15.

28. 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 17 are implemented.

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