Communication processing method and device, equipment and readable storage medium

Abstract

The invention discloses a communication processing method and device, equipment and a readable storage medium. The method comprises the steps that a far-end terminal receives a first discovery message sent by a last-hop relay terminal; the remote terminal determines a service cell of the remote terminal according to the first discovery message; wherein the serving cell of the remote terminal comprises a serving cell of a first relay terminal or a serving cell of a second relay terminal, the first relay terminal is a relay terminal directly connected with a base station, and the second relay terminal is a farthest reachable relay terminal connected with the remote terminal PC5; under the condition that the serving cell of the first relay terminal or the serving cell of the second relay terminal is located outside the RNA of the far-end terminal, the far-end terminal executes an RNA updating process; or under the condition that the serving cell of the first relay terminal or the serving cell of the second relay terminal is located outside the TA of the far-end terminal, the far-end terminal executes the TA updating process.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a communication processing method, device, equipment and readable storage medium. Background Art

[0002] At present, the New Radio (NR) only supports single-hop terminal to network (UE-to-Network, U2N) relay, with only one relay terminal (Relay UE), and the relevant technology stipulates that the serving cell of the remote terminal (Remote UE) follows the serving cell of the Relay UE connected to its PC5, so the Remote UE can simply use the serving cell change of this Relay UE to determine whether it has moved out of its RNA (Radio Notification Area) / TA (Tracking Area) configuration. However, in multi-hop U2N relay, there are two or more RelayUEs, and how the Remote UE performs the RNA update (RNAU) and TA update (TAU) processes is an urgent problem to be solved. Summary of the invention

[0003] 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 processes in a multi-hop U2N relay scenario.

[0004] In a first aspect, a communication processing method is provided, comprising:

[0005] The remote terminal receives a first discovery message sent by the previous-hop relay terminal;

[0006] The remote terminal determines, according to the first discovery message, a serving cell of the remote terminal;

[0007] 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;

[0008] 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.

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

[0010] A third relay terminal receives a second discovery message sent by a previous-hop relay terminal;

[0011] The third relay terminal sends a third discovery message to a next-hop relay terminal, or the third relay terminal sends a first discovery message to a remote terminal;

[0012] Wherein, at least one of the second discovery message and the third discovery message includes first serving cell access information of a first relay terminal, the first discovery message is used for determining a serving cell of the remote terminal, the serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of a second relay terminal, the first relay terminal is a relay terminal directly connected to a base station, and the second relay terminal is the relay terminal that can reach the farthest through PC5 connection of the remote terminal.

[0013] In a third aspect, a communication processing method is provided, including:

[0014] A first relay terminal sends a fourth discovery message to a next-hop relay terminal, the fourth discovery message includes serving cell access information of the first relay terminal, and the serving cell access information includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC. The first relay terminal is a relay terminal directly connected to a base station.

[0015] In a fourth aspect, a communication processing apparatus is provided, which is applied to a remote terminal and includes:

[0016] A first receiving module, configured to receive a first discovery message sent by a previous-hop relay terminal;

[0017] A first determining module, configured to determine a serving cell of the remote terminal according to the first discovery message;

[0018] Wherein, the serving cell of the remote terminal includes the serving cell of a first relay terminal or the serving cell of a second relay terminal, the first relay terminal is a relay terminal directly connected to a base station, and the second relay terminal is the relay terminal that can reach the farthest through PC5 connection of the remote terminal;

[0019] A first processing module, configured to execute an RNA update process when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the RNA of the remote terminal; or execute a TA update process when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the TA of the remote terminal.

[0020] Fifth aspect, there is provided a communication processing apparatus, which is applied to a third relay terminal and includes:

[0021] A second receiving module, configured to receive a second discovery message sent by a previous-hop relay terminal;

[0022] 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;

[0023] Wherein, at least one of the second discovery message and the third discovery message includes first serving cell access information of a first relay terminal, the first discovery message is used for determining a serving cell of the remote terminal, the serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of a second relay terminal, the first relay terminal is a relay terminal directly connected to a base station, and the second relay terminal is the relay terminal that can reach the farthest distance through PC5 connection with the remote terminal.

[0024] Sixth aspect, there is provided a communication processing apparatus, which is applied to a first relay terminal and includes:

[0025] A second sending module, configured to send a fourth discovery message to a next-hop relay terminal, the fourth discovery message includes serving cell access information of the first relay terminal, and the serving cell access information includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC. The first relay terminal is a relay terminal directly connected to a base station.

[0026] Seventh aspect, there is provided a terminal, including: a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method described in the first aspect or the second aspect or the third aspect are implemented.

[0027] Eighth aspect, there is provided a communication system, including a remote terminal, a first relay terminal, and a third relay terminal;

[0028] Wherein, the remote terminal is configured to execute the method described in the first aspect, the first relay terminal is configured to execute the method described in the third aspect, and the third relay terminal is configured to execute the method described in the second aspect.

[0029] Ninth aspect, there is provided a readable storage medium, 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 or the second aspect or the third aspect are implemented.

[0030] In a tenth aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to run a program or instructions to implement the steps of the method described in the first aspect, the second aspect, or the third aspect.

[0031] In an eleventh aspect, a computer program / program product is provided. The computer program / program product is stored in a non-transitory storage medium. The program / program product 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.

[0032] In an embodiment of the present application, the remote terminal may determine the serving cell of the first relay terminal or the serving cell of the second relay terminal as the serving cell of the remote terminal. When the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the RNA of the remote terminal, the remote terminal executes an RNA update process. Or, when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the TA of the remote terminal, the remote terminal executes a TA update process. The first relay terminal is a relay terminal directly connected to the base station, and the second relay terminal is the relay terminal with the farthest reachable PC5 connection from the remote terminal. By clarifying the serving cell of the remote terminal in a multi-hop U2N relay scenario, it is possible to trigger the remote terminal to execute an RNA update or a TA update process in a 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of UE-to-Network relay;

[0034] Figure 2 Schematic diagram of the RNAU / TAU process of the Remote UE in a single-hop scenario;

[0035] Figure 3a 、 Figure 3b Schematic diagram of the definition of terms in a multi-hop L2 U2N relay network;

[0036] Figure 4 Schematic diagram of the architecture of the wireless communication system according to an embodiment of the present application;

[0037] Figure 5 One of the flowcharts of the communication processing method provided by an embodiment of the present application;

[0038] Figure 6 Another flowchart of the communication processing method provided by an embodiment of the present application;

[0039] Figure 7It is the third flowchart of the communication processing method provided by the embodiments of the present application;

[0040] Figure 8 It is the first flowchart of the communication processing method provided by the embodiments of the present application;

[0041] Figure 9 It is the second flowchart of the communication processing method provided by the embodiments of the present application;

[0042] Figure 10 It is the third flowchart of the communication processing method provided by the embodiments of the present application;

[0043] Figure 11 It is the fourth flowchart of the communication processing method provided by the embodiments of the present application;

[0044] Figure 12 It is the first schematic diagram of the communication processing device provided by the embodiments of the present application;

[0045] Figure 13 It is the second schematic diagram of the communication processing device provided by the embodiments of the present application;

[0046] Figure 14 It is the third schematic diagram of the communication processing device provided by the embodiments of the present application;

[0047] Figure 15 It is the first schematic diagram of the terminal provided by the embodiments of the present application;

[0048] Figure 16 It is the second schematic diagram of the terminal provided by the embodiments of the present application. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0050] The terms "first", "second", etc. in this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of this 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 the number of objects is not limited. For example, the first object can be one or more. In addition, "or" in this application means at least one of the connected objects. For example, "A or B" covers three scenarios, namely, Scenario 1: including A and not including B; Scenario 2: including B and not including A; Scenario 3: including both A and B. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should be noted that the technology described in the embodiments of this application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, and 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 described technology can be used in the systems and radio technologies mentioned above, as well as in other systems and radio technologies. The following description describes the New Radio (NR) system for example purposes, and the NR term is used in most of the following descriptions, but these technologies can also be applied to systems other than NR system applications, such as the 6th Generation (6G) communication system. th Generation, 6G) communication system.

[0052] I. Regarding the Sidelink (SL) Relay mechanism.

[0053] The relay technology in a wireless communication system adds one or more relays between the base station and the terminal (for example, User Equipment (UE)), which are responsible for forwarding the wireless signal one or more times, that is, the wireless signal sent by the base station has to go through multiple hops to reach the UE.

[0054] The wireless relay technology can not only be used to expand cell coverage and make up for the blind spots in cell coverage, but also improve the cell capacity through spatial resource reuse. For indoor coverage, the Relay technology can also play a role in overcoming penetration loss and improving the indoor coverage quality.

[0055] Taking the single-hop relay mechanism as an example, the wireless relay can split a base station-UE link into two links: base station-relay station and relay station-UE, thus having the opportunity to replace a link with poor quality with two links with better quality to obtain higher link capacity and better coverage.

[0056] The new radio (NR) currently supports the UE-to-network relay (U2N relay) mechanism based on the sidelink, that is, one end of the Relay is connected to the UE and the other end of the Relay is connected to the network side. The UE that undertakes the wireless relay function is called the relay UE. The UE that relies on the Relay UE to connect to the network side is called the remote UE (Remote UE). A typical scenario is as Figure 1 shown.

[0057] Figure 1 This is a typical U2N relay scenario. The Remote UE needs to transmit data to the network side. However, due to poor coverage, it can be relayed by the Relay UE. The interface between the Relay UE and the base station is the Uu interface, and the interface between the Relay UE and the Remote UE is the Sidelink PC5 interface.

[0058] Generally speaking, the Relay UE is open and can serve more than one Remote UE. However, currently NR only supports single-hop U2N relay, that is, there is only one Relay UE. To further solve the deep coverage hole and better support public safety services, NR will study how to support the multi-hop U2N relay mechanism. Simply put, multi-hop U2N relay is a scenario where the Remote UE and the network side communicate with each other through two or more Relay UEs for data relaying.

[0059] II. In the single-hop scenario: The RAN-based Notification Area Update (RNAU) or Tracking Area Update (TAU) process of the Remote UE.

[0060] See Figure 2, the specific steps are as follows:

[0061] Step 0: Establish a PC5 connection between the Remote UE and the Relay UE.

[0062] Step 1: The Relay UE sends a discovery message to the Remote UE, and the discovery message includes the access information of the Relay UE serving cell.

[0063] Step 2: The Remote UE determines whether the Relay UE serving cell has been removed from the RAN or TA configuration of the Remote UE.

[0064] Step 3: In the case where the Relay UE serving cell has been removed from the RAN or TA configuration of the Remote UE, perform the RNAU or TAU process.

[0065] TA configuration: A list composed of at least one Tracking Area Identity (TAI), where one TAI includes a Tracking Area Code (TAC) + a Public Land Mobile Network (PLMN) identity.

[0066] RNA configuration: There are two methods to configure RNA:

[0067] Method 1: A list composed of at least one Cell identity;

[0068] Method 2: A list composed of at least one Radio Access Network area ID (RAN area ID); where one RAN area ID = PLMN + TAC, or one RAN area ID = PLMN + TAC + a Radio Access Network Notification Area Code (RNAC).

[0069] Among them, the area size of the RNA configuration is a subset of the TA configuration, and its maximum area is equal to the TA configuration.

[0070] III. Terminology definitions for multi-hop relay networks:

[0071] For the sake of easy understanding and description, in this embodiment, the multi-hop Layer 2 (L2) U2N relay network is simply referred to as the multi-hop relay network. Relative to Figure 3a and Figure 3b the remote UE in, the relays therein are classified and defined as follows:

[0072] (1) Donor Relay UE: A relay UE that establishes a Uu connection with the serving base station or can establish a Uu connection with the 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;

[0073] Optionally, the donor relay UE may include, but is not limited to, one of the following: 1) A Relay UE that undertakes PC5 hop + Uu hop; 2) A Relay UE directly connected to the base station; 3) In an N-hop U2N relay network (N is a positive integer greater than 1), the Nth-hop Relay UE in the uplink transmission; 4) In an N-hop U2N relay network (N is a positive integer greater than 1), the first-hop Relay UE in the downlink transmission.

[0074] (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, and is the access relay UE for that Remote UE.

[0075] (3) Intermediate Relay UE: A relay UE located between the access relay UE and the donor relay UE, which helps the Remote UE complete the forwarding of data and signaling between the access relay UE and the donor relay UE. In a multi-hop relay network, there can be 0, 1, or multiple intermediate relay UEs between the access relay UE and the donor relay UE of a Remote Relay UE. It should be noted that the intermediate relay UE may also include the access relay UE, that is, all relay UEs between the donor relay UE and the Remote UE are understood as intermediate relay UEs, as Figure 3b shown.

[0076] 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 the Remote UE; 3) Any Relay UE other than the Relay UE directly connected to the base station; 4) In an N-hop U2N relay network (N is a positive integer greater than 1), the Kth-hop Relay UE (K is any positive integer greater than or equal to 1 and less than N) in the uplink or downlink transmission.

[0077] (4) Downstream UE: All UEs that access the network through a relay UE become the downstream UEs of that relay UE.

[0078] For example, the Remote UE is the downstream UE of the access relay UE, the Remote UE and the access relay UE are the downstream UEs of the intermediate relay UE, and the Remote UE, the access relay UE, and the intermediate relay UE are the downstream UEs of the donor relay UE.

[0079] (5) Upstream UE: A relay UE that forwards uplink and downlink data and signaling for a UE is the upstream UE of that UE.

[0080] For example, in the uplink direction, an access relay UE, an intermediate relay UE, or a host relay UE is the upstream UE of a remote UE, and a host relay UE and an intermediate relay UE are the upstream UEs of an access relay UE.

[0081] In the downlink direction, an intermediate relay UE or an intermediate relay UE is the upstream UE of a host relay UE.

[0082] (6) Sub-UE and parent UE: When relay UE a establishes a PC5 connection with upstream relay UE b to access the network, relay UE b is the parent UE of UE a, and relay UE a is the sub-UE of UE b.

[0083] For example, a host relay UE is the parent UE of an intermediate relay UE, an intermediate relay UE is the sub-UE of a host relay UE, an intermediate relay UE is the parent UE of an access relay UE, an access relay UE is the sub-UE of an intermediate relay, an access relay UE is the parent UE of a remote UE, and a remote UE is the sub-UE of an access relay UE.

[0084] Relatively speaking, an access relay UE also has the identity of a remote UE with respect to an intermediate relay UE; and an intermediate relay UE has the identity of a remote UE with respect to a host relay UE, and so on. This will not be elaborated further in the subsequent embodiments of this application.

[0085] Figure 4 The block diagram of a wireless communication system to which the embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 41 and a network-side device 42.

[0086] Among them, the terminal 41 can be a mobile phone, a tablet personal computer, a laptop computer, a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a flight vehicle, a vehicle user equipment (VUE), a shipborne device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (PC), a teller machine or a self-service machine, etc., which are terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart earphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart ankle chains, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle user equipment can also be referred to as a vehicle terminal, a vehicle controller, a vehicle module, a vehicle component, a vehicle chip or a vehicle unit, etc. In addition to the above terminal devices, the terminal involved in this application can also be a chip inside 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.

[0087] The network-side device 42 may include an access network device or a core network device. Among them, 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 (AP), or a wireless fidelity (WiFi) node, etc. The base station may be referred to as Node B (NB), evolved Node B (eNB), next generation Node B (gNB), New Radio Node B (NR Node B), access point, relay base station (RBS), serving base station (SBS), base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), home Node B (HNB), home evolved Node B, transmission reception point (TRP), or some other suitable term in the art. As long as the same technical effect is achieved, the base station is not limited to a specific technical term. It should be noted that in the embodiments of this application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0088] The core network device 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 (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (L-NEF), Binding Support Function (BSF), Application Function (AF), etc. It should be noted that in the embodiments of this application, only the core network devices in the NR system are taken as examples for introduction, and the specific types of core network devices are not limited.

[0089] The communication processing method, device, communication equipment, and readable storage medium provided by the embodiments of this application will be described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0090] See Figure 5 , the embodiments of this application provide a communication processing method, which is applied to a Remote UE, and the specific steps include: Step 501, Step 502, and Step 503.

[0091] Step 501: The remote terminal receives a first discovery message sent by the previous-hop relay terminal;

[0092] Take Figure 3aFor example, the previous-hop relay terminal of the remote terminal can be an access relay UE.

[0093] Step 502: The remote terminal determines the serving cell of the remote terminal according to the first discovery message.

[0094] Among them, 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 relay terminal that the PC5 connection of the remote terminal can reach at the farthest distance.

[0095] Take Figure 3a as an example, the first relay terminal is a host relay UE.

[0096] In this embodiment, the "relay terminal that the PC5 connection of the remote terminal can reach at the farthest distance" refers to the relay terminal that the remote terminal can establish the farthest connection (which can be understood as the most number of hops hop) through the PC5 interface. Here, "the farthest" does not mean the farthest physical distance between the relay terminal and the remote terminal. This "the farthest" can be understood as the PC5 hop number between this relay terminal and the remote terminal is greater than the PC5 hop number between other relay terminals and the remote terminal.

[0097] Take Figure 3a as an example. Suppose 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 relay UE that the remote UE's PC5 connection can reach at the farthest distance is the intermediate relay UE.

[0098] Determining the serving cell of the second relay terminal as the serving cell of the remote terminal in this embodiment can better meet the power-saving requirements of the relay terminal. Specifically, when the Remote UE has no traffic transmission and stays in the Radio Resource Control Idle state (RRC_IDLE) or the Radio Resource Control Inactive state (RRC_INACTIVE), it can be allowed that the PC5 RRC connections of some Relay UEs serving the Remote UE are not established temporarily, or the established PC5 RRC connections are released (for example Figure 11There is no PC5 RRC connection between Relay UE2 and Relay UE3, and no PC5 RRC connection between Relay UE3 and Relay UE 4), which is beneficial to the energy saving of these Relay UEs. Until the Remote UE meets the conditions for executing the RANU or TAU process, the PC5 RRC connection of the aforementioned Relay UE is established or re-established, so as to establish a multi-hop relay forwarding link, so that the Remote UE can continue to execute the RANU or TAU process.

[0099] Step 503: When the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the RNA of the remote terminal, the remote terminal executes the RNA update process; or, when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the TA of the remote terminal, the remote terminal executes the TA update process.

[0100] In an embodiment of the present application, the first discovery message includes the first serving cell access information of the first relay terminal, and the first serving cell access information includes at least one of the public land mobile network identifier to which the serving cell belongs, the cell identifier, the TAC, and the RNAC.

[0101] For Figure 3a example, the first discovery message includes the serving cell access information of the host relay UE.

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

[0103] For Figure 3a example, the first discovery message includes the serving cell access information of the access relay UE and the serving cell access information of the host relay UE.

[0104] In an embodiment of the present application, the first discovery message includes a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal, and the serving 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 serving cell access information or the serving cell access information of other relay terminals includes at least one of the public land mobile network identifier to which the serving cell belongs, the cell identifier, the TAC, and the RNAC.

[0105] 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: a host relay UE, an intermediate relay UE, and an 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).

[0106] In an embodiment of the present application, the remote terminal determines the service cell of the remote terminal according to the first discovery message, including:

[0107] The remote terminal determines, according to the service cell access information list in the first discovery message, that the relay terminal with the farthest reachable PC5 connection of the remote terminal is the second relay terminal;

[0108] The remote terminal determines the service cell of the remote terminal as the service cell of the second relay terminal.

[0109] In an 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 other relay terminals in the service cell access information list is set according to the relay forwarding order of the first relay terminal and other relay terminals. For example, the relay forwarding order may be the order of forwarding the discovery message.

[0110] Taking Figure 3a as an example, the relay forwarding order of the host relay UE and other relay UEs: host relay UE - intermediate relay UE - access relay UE. Therefore, the service cell access information list included in the first discovery message sequentially 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.

[0111] In the embodiments of the present application, by clarifying the service cell of the remote terminal in the multi-hop U2N relay scenario, the remote terminal can perform the RNA update or TA update process in the multi-hop U2N relay scenario, avoiding the problem that the remote terminal cannot be reached by the network downlink due to being in a deep coverage hole.

[0112] Referring to Figure 6 , the embodiments of the present application provide a communication processing method applied to a third relay terminal. The specific steps include: step 601 and step 602.

[0113] Step 601: The third relay terminal receives the second discovery message sent by the previous-hop relay terminal;

[0114] 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;

[0115] Wherein, at least one of the second discovery message and the third discovery message includes the access information of the first service cell of the first relay terminal, the first discovery message is used for determining the service cell of the remote terminal, and 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 relay terminal that can reach the farthest distance through the PC5 connection of the remote terminal.

[0116] For Figure 3a example, the third relay terminal may be an intermediate relay UE, the next-hop relay terminal of the third relay terminal may be an access relay UE, the previous-hop relay terminal of the third relay terminal is a host relay terminal, or the third relay terminal may be an access relay UE, and the previous-hop relay terminal of the third relay terminal is an intermediate relay UE.

[0117] In an embodiment of the present application, the third relay terminal sending the first discovery message to the remote terminal includes:

[0118] If the measurement result of the measurement quantity corresponding to the first discovery message is greater than or equal to the first preset value, the third relay terminal sends the first discovery message to the remote terminal.

[0119] Optionally, the measurement quantity includes but is not limited to the reference signal receiving power of the sidelink discovery signal (Sidelink Discovery Signal - Reference Signal Receiving Power, SD-RSRP).

[0120] It can be understood that the first preset value is not specifically limited in this embodiment.

[0121] In an embodiment of the present application, the first discovery message including the access information of the first service cell of the first relay terminal includes:

[0122] The first discovery message includes the access information of the first service cell of the first relay terminal and the access information of the fourth service cell of the third relay terminal. The access information of the first service cell or the access information of the fourth service cell includes at least one of the public land mobile network identifier, cell identifier, TAC, and RNAC to which the service cell belongs.

[0123] ForFigure 3a For example, the first discovery message includes the service cell access information of the host relay UE and the service cell access information of the access relay UE.

[0124] In an embodiment of the present application, the first discovery message including the first service cell access information of the first relay terminal includes:

[0125] 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 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 to which the service cell belongs, the cell identifier, the TAC, and the RNAC.

[0126] For Figure 3a example, all the relay terminals on the relay forwarding link between the first relay terminal and the previous-hop relay terminal of the remote terminal include: the host relay UE, the intermediate relay UE, and the 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.

[0127] In an embodiment of the present application, the third relay terminal sends a third discovery message to the next-hop relay terminal, including:

[0128] If the measurement result of the measurement quantity corresponding to the third discovery message is greater than or equal to a second preset value, then the third relay terminal sends a third discovery message to the next-hop relay terminal.

[0129] It can be understood that the second preset value is not specifically limited in this embodiment.

[0130] In an embodiment of the present application, the third discovery message including the first service cell access information of the first relay terminal includes:

[0131] 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 to which the service cell belongs, the cell identifier, the TAC, and the RNAC.

[0132] For Figure 3aFor 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.

[0133] In an embodiment of the present application, the first serving cell access information of the first relay terminal included in the third discovery message includes:

[0134] The third discovery message includes a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal and the serving 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 serving cell access information or the serving cell access information of other relay terminals includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0135] For Figure 3a 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.

[0136] In an 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.

[0137] For Figure 3a example, the serving cell access information list included in the first discovery message sequentially includes the serving cell access information of the host relay UE, the serving cell access information of the intermediate relay UE, and the serving cell access information of the access relay UE, that is, the serving cell access information in the serving cell access information list is set according to the relay forwarding order of the relay terminals on the relay forwarding link.

[0138] In an 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 other relay terminal except the first relay terminal.

[0139] In an embodiment of the present application, by clarifying that in a multi-hop U2N relay scenario, a remote terminal can determine the serving cell of the first relay terminal or the serving cell of the second relay terminal as the serving cell of the remote terminal, the remote terminal can then perform an RNA update or a 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.

[0140] SeeFigure 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.

[0141] Step 701: The first relay terminal sends a fourth discovery message to the next-hop relay terminal. The fourth discovery message includes the 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 to which the service cell belongs, a cell identifier, a TAC, and an RNAC. The first relay terminal is a relay terminal directly connected to the base station.

[0142] Take Figure 3a 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.

[0143] It can be understood that if Figure 6 in the illustrated embodiment, the third relay terminal is the next-hop relay terminal of the first relay terminal, then 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 (i.e., the second discovery message) to the third relay terminal.

[0144] In an embodiment of the present application, the service cell access information of the first relay terminal in the fourth discovery message is used to determine the service cell of the remote terminal.

[0145] In the embodiment of the present application, by clarifying that in a multi-hop U2N relay scenario, the remote terminal can determine the service cell of the remote terminal based on the service cell of the first relay terminal or the service cell of the second relay terminal, the remote terminal can then perform an RNA update or a 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.

[0146] The implementation manner of the present application will be introduced below in conjunction with the embodiments.

[0147] Embodiment 1: It is stipulated that the service cell of the Remote UE follows the host Relay UE (Donor Relay UE).

[0148] Discovery method 1: The content included in the Discovery message is all set to the service cell access information of the Donor Relay UE.

[0149] In Discovery method 1, the Remote UE is the remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0150] As Figure 8 shown, the specific steps are as follows:

[0151] Step 800 (Premise): The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4.

[0152] Step 801: Relay UE-4 (i.e., the Donor Relay UE) broadcasts a Discovery message, and the Discovery message includes the serving cell access information of Relay UE-4, where the serving cell access information includes at least the PLMN ID, Cell ID, TAC, and RNAC to which the serving cell of Relay UE-4 belongs.

[0153] 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 broadcast Discovery message is the fourth discovery message.

[0154] Step 802: Relay UE-3 receives the Discovery message of Relay UE-4 (i.e., the Donor Relay UE) and forwards the Discovery message.

[0155] For example, in Step 802, Relay UE-3 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.

[0156] In Step 802, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: Measure the SD-RSRP corresponding to the Discovery message. If the SD-RSRP measurement result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0157] Step 803: Relay UE-2 receives the Discovery message of Relay UE-3 and forwards the Discovery message.

[0158] For example, in step 803, Relay UE-2 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 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0159] In step 803, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0160] Step 804: Relay UE-1 receives the Discovery message from Relay UE-2 and forwards the Discovery message.

[0161] For example, in step 804, Relay UE-1 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.

[0162] In step 804, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0163] Step 805: 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 Remote UE according to the serving cell access information of Relay UE-4 included in the Discovery message. If so, the RNAU or TAU process is performed.

[0164] For example, the Discovery message received by Remote UE is the first discovery message.

[0165] Discovery Method 2: The Discovery message contains content that sets 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 the current Relay UE itself. It can be understood that in the related art, the current Relay UE sends the serving cell access information of the current Relay UE itself to the next-hop Relay UE through the Discovery message. However, in this embodiment, the Discovery message contains content that sets two serving cell access information. In this way, the Discovery message in this embodiment can be compatible with the Discovery message in the related art, and the content that the Discovery message in this embodiment contains two serving cell access information can enable the next-hop Relay UE to determine the network topology structure.

[0166] In Discovery Method 2, the Remote UE is the remote terminal, the Relay UE-1 is the previous-hop relay terminal of the remote terminal, and the Relay UE-4 is the first relay terminal.

[0167] As Figure 9 shown, the specific steps are as follows:

[0168] Step 900 (premise): The Remote UE establishes a PC5 RRC connection with the Relay UE-1, the Relay UE-1 establishes a PC5 RRC connection with the Relay UE-2, the Relay UE-2 establishes a PC5 RRC connection with the Relay UE-3, and the Relay UE-3 establishes a PC5 RRC connection with the Relay UE-4.

[0169] Step 901: The Relay UE-4 (i.e., the Donor Relay UE) broadcasts a Discovery message, and the Discovery message includes the serving cell access information of the Relay UE-4, where the serving cell access information at least includes the PLMN ID, Cell ID, TAC, and RNAC to which the serving cell of the Relay UE-4 belongs.

[0170] For example, in Step 901, the Relay UE-4 is the first relay terminal, the Relay UE-3 is the next-hop relay terminal of the first relay terminal, and the broadcast Discovery message is the fourth discovery message.

[0171] Step 902: Relay UE-3 receives the Discovery message from Relay UE-4 (i.e., the Donor Relay UE), sets the content of the Discovery message to the access information of two serving cells, one specified as the access information of the serving cell of the Donor Relay UE and the other specified as the access information of the serving cell of Relay UE-3 (i.e., including the access information of Relay UE-4 and Relay UE-3), and forwards the Discovery message.

[0172] For example, in step 902, Relay UE-3 is the third relay terminal, and Relay UE-4 is the previous-hop relay terminal of the third relay terminal. This Discovery message is the second discovery message.

[0173] In step 902, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: Measure the SD-RSRP corresponding to this Discovery message. If the SD-RSRP measurement result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0174] Step 903: Relay UE-2 receives the Discovery message from Relay UE-3, sets the content of the Discovery message to the access information of two serving cells, one specified as the access information of the serving cell of the Donor Relay UE and the other specified as the access information of the serving cell of Relay UE-2 (i.e., including the access information of Relay UE-4 and Relay UE-2), and forwards the Discovery message.

[0175] For example, in step 903, Relay UE-2 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.

[0176] In step 903, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: Measure the SD-RSRP result corresponding to this Discovery message. If this SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0177] Step 904: Relay UE-1 receives the Discovery message from Relay UE-2, sets the content of the Discovery message as the access information of two serving cells, one is specified as the access information of the serving cell of the Donor Relay UE, and the other is specified as the access information of the serving cell of Relay UE-1 (i.e., Relay UE-4, Relay UE-1), and forwards the Discovery message.

[0178] For example, in step 904, Relay UE-1 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.

[0179] In step 904, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0180] Step 905: 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 according to the access information of the serving cell of Relay UE-4 in the Discovery message. If so, the RNAU or TAU process is executed.

[0181] For example, the Discovery message received by Remote UE is the first discovery message.

[0182] Discovery method 3: The content included in the Discovery message sets a list of serving cell access information, and each serving cell access information in the list is set according to the order of Relay UEs through which the discovery message is forwarded.

[0183] In Discovery method 3, Remote UE is the remote terminal, Relay UE-1 is the previous-hop relay terminal of the remote terminal, and Relay UE-4 is the first relay terminal.

[0184] As Figure 10 shown, the specific steps are as follows:

[0185] Step 1000 (Premise): The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4.

[0186] Step 1001: Relay UE-4 (i.e., the Donor Relay UE) broadcasts a Discovery message, and the content of the Discovery message includes the access information of the serving cell of Relay UE-4, where the access information of the serving cell includes at least the PLMN ID, Cell ID, TAC, and RNAC to which the serving cell of this Relay UE-4 belongs.

[0187] For example, in Step 1001, Relay UE-4 is the first relay terminal, Relay UE-3 is the next-hop relay terminal of the first relay terminal, and the broadcast Discovery message is the fourth discovery message.

[0188] Step 1002: Relay UE-3 receives the Discovery message of Relay UE-4 (i.e., the Donor Relay UE), sets a list of access information of the serving cell for the content of the Discovery message, and each access information of the serving cell in the list is set in the order of the Relay UE through which the discovery message is forwarded. The list of access information of the serving cell (i.e., Relay UE-4, Relay UE-3), and forwards the Discovery message.

[0189] For example, in Step 1002, Relay UE-3 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.

[0190] In Step 1002, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: Measure the SD-RSRP corresponding to the Discovery message. If the SD-RSRP measurement result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0191] Step 1003: Relay UE-2 receives the Discovery message from Relay UE-3, sets a serving cell access information list in the content of the Discovery message, and each serving cell access information in the list is set according to the order of Relay UEs through which the discovery message is forwarded. The serving cell access information list (i.e., including the serving cell access information of Relay UE-4, Relay UE-3, and Relay UE-2 in sequence), and forwards the Discovery message.

[0192] For example, in step 1003, Relay UE-2 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 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0193] In step 1003, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0194] Step 1004: Relay UE-1 receives the Discovery message from Relay UE-2, sets a serving cell access information list in the content of the Discovery message, and each serving cell access information in the list is set according to the order of Relay UEs through which the discovery message is forwarded. The serving cell access information list (i.e., including 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.

[0195] For example, in step 1004, Relay UE-1 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.

[0196] In step 1004, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0197] Step 1005: The Remote UE receives the Discovery message of the Relay UE-1. According to the serving cell access information of the Relay UE-4 included in the content of the Discovery message, determine whether the serving cell of the Relay UE-4 is outside the RNA or TA configuration of the Remote UE. If so, perform the RNAU or TAU process.

[0198] For example, the Discovery message received by the Remote UE is the first discovery message.

[0199] Embodiment 2: It is stipulated that the serving cell of the Remote UE is the serving cell of the Intermediate Relay UE that is the farthest reachable by the PC5 connection.

[0200] Taking the number N of Relay UEs as 4 as an example, as Figure 11 shown. The Intermediate Relay UE includes Relay UE 1, Relay UE 2, Relay UE 3, and the Intermediate Relay UE that is the farthest reachable by the PC5 connection is Relay UE 2.

[0201] Discovery method 4: The content of the Discovery message sets a list of serving cell access information, and each serving cell access information in the list is set in the order of the Relay UEs through which the discovery message is forwarded.

[0202] In Discovery method 4, the Remote UE is the remote terminal, the Relay UE-1 is the previous-hop relay terminal of the remote terminal, and the Relay UE-4 is the first relay terminal.

[0203] See Figure 11 , and the specific steps are as follows:

[0204] Step 1100 (premise): The Remote UE establishes a PC5 RRC connection with the Relay UE-1, and the Relay UE-1 establishes a PC5 RRC connection with the Relay UE-2.

[0205] According to step 1100, it can be obtained that the IntermediateRelay UE farthest reachable by the PC5 connection of the Remote UE is Relay UE 2.

[0206] Step 1101: Relay UE-4 (i.e., the Donor Relay UE) broadcasts a Discovery message, and the content of the Discovery message includes the service cell access information of the Donor Relay UE, where the service cell access information at least includes the PLMN ID, Cell ID, TAC, and RNAC to which the service cell belongs.

[0207] 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 broadcast Discovery message is the fourth discovery message.

[0208] Step 1102: Relay UE-3 receives the Discovery message of Relay UE-4 (i.e., the Donor Relay UE), sets a service cell access information list for the content of the Discovery message, and each service cell access information in the list is set in the order of the Relay UE through which the discovery message is forwarded. The service cell access information list (i.e., Relay UE-4, Relay UE-3), and forwards the Discovery message.

[0209] For example, in step 1102, Relay UE-3 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.

[0210] In step 1102, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: Measure the SD-RSRP corresponding to the Discovery message. If the SD-RSRP measurement result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0211] Step 1103: Relay UE-2 receives the Discovery message from Relay UE-3, sets a service cell access information list in the content of the Discovery message, and each service cell access information in the list is set in the order of Relay UEs through which the discovery message is forwarded. The service cell access information list (i.e., successively including the service cell access information of Relay UE-4, Relay UE-3, and Relay UE-2), and forwards the Discovery message.

[0212] For example, in Step 1103, Relay UE-2 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 is the second discovery message, and the Discovery message forwarded by Relay UE-2 is the third discovery message.

[0213] In Step 1103, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0214] Step 1104: Relay UE-1 receives the Discovery message from Relay UE-2, sets a service cell access information list in the content of the Discovery message, and each service cell access information in the list is set in the order of Relay UEs through which the discovery message is forwarded. The service cell access information list (i.e., successively including the service cell access information of Relay UE-4, Relay UE-3, Relay UE-2, and Relay UE-1), and forwards the Discovery message.

[0215] For example, in Step 1104, Relay UE-1 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.

[0216] In step 1104, optionally, forwarding the Discovery message is performed on the premise of meeting the PC5 threshold condition. The method for determining whether the PC5 threshold condition is met is as follows: measure the SD-RSRP result corresponding to the Discovery message. If the SD-RSRP result is greater than the preset SD-RSRP threshold value, it is determined that the condition is met.

[0217] Step 1105: The Remote UE receives the Discovery message from the Relay UE-1, and based on the service cell access information of the Intermediate Relay UE (i.e., Relay UE-2) that is the farthest reachable by the PC5 connection of the Remote UE included in the content of the Discovery message, determines whether the service cell of Relay UE-2 is outside the RNA or TA configuration of the Remote UE. If so, the RNAU or TAU process is executed.

[0218] For example, the Discovery message received by the Remote UE is the first discovery message.

[0219] See Figure 12 This embodiment of the present application provides a communication processing device applied to a remote terminal (Remote UE). The device includes:

[0220] A first receiving module 1201, configured to receive a first discovery message sent by the previous-hop relay terminal;

[0221] A first determining module 1202, configured to determine the service cell of the remote terminal according to the first discovery message;

[0222] Wherein, 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 relay terminal that is the farthest reachable by the PC5 connection of the remote terminal;

[0223] A first processing module 1203, configured to execute an RNA update process for the remote terminal when the service cell of the first relay terminal or the service cell of the second relay terminal is outside the RNA of the remote terminal; or execute a TA update process for the remote terminal when the service cell of the first relay terminal or the service cell of the second relay terminal is outside the TA of the remote terminal.

[0224] In an implementation manner of the present application, the first discovery message includes the 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 to which the serving cell belongs, a cell identifier, a tracking area code (TAC), and a radio access network notification area code (RNAC).

[0225] In an implementation manner of the present application, the first discovery message includes the second serving cell access information of the previous-hop relay terminal of the remote terminal and the first serving cell access information of the first relay terminal, and the first serving cell access information or the second serving cell access information includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0226] In an implementation manner of the present application, the first discovery message includes a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal and the serving 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. The first serving cell access information or the serving cell access information of other relay terminals includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0227] In an implementation manner of the present application, the first determination module 1202 is further configured to: determine, according to the serving cell access information list in the first discovery message, that the relay terminal that the remote terminal PC5 can reach farthest through connection is the second relay terminal; and determine that the serving cell of the remote terminal is the serving cell of the second relay terminal.

[0228] In an implementation manner 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 other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and other relay terminals.

[0229] The device provided by the embodiments of the present application can implement Figure 5 the various processes implemented by the method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein again.

[0230] See Figure 13 , the embodiments of the present application provide a communication processing device, which is applied to a third relay terminal. The device 1300 includes:

[0231] A second receiving module 1301, configured to receive a second discovery message sent by a previous-hop relay terminal;

[0232] A first sending module 1302, configured to send a third discovery message to a next-hop relay terminal or send a first discovery message to a remote terminal;

[0233] Wherein, at least one of the second discovery message and the third discovery message includes first serving cell access information of a first relay terminal, the first discovery message is used for determining a serving cell of the remote terminal, and the serving cell of the remote terminal includes the serving cell of the first relay terminal or the serving cell of a second relay terminal. The first relay terminal is a relay terminal directly connected to a base station, and the second relay terminal is the relay terminal with the farthest reachable PC5 connection of the remote terminal.

[0234] In an embodiment of the present application, the first sending module 1302 is further configured to: when a measurement result of a measurement quantity corresponding to the first discovery message is greater than or equal to a first preset value, send the first discovery message to the remote terminal.

[0235] In an embodiment of the present application, the first discovery message including the first serving cell access information of the first relay terminal includes:

[0236] The first discovery message includes the first serving cell access information of the first relay terminal and the fourth serving cell access information of a third relay terminal. The first serving cell access information or the fourth serving cell access information includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

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

[0238] The first discovery message includes a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal and the serving cell access information of other relay terminals except the first relay terminal on a relay forwarding link between the first relay terminal and the third relay terminal. The first serving cell access information or the serving cell access information of other relay terminals includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0239] In an embodiment of the present application, the first sending module 1302 is further configured to: when a measurement result of a measurement quantity corresponding to the third discovery message is greater than or equal to a second preset value, send the third discovery message to the next-hop relay terminal.

[0240] In an embodiment of the present application, the third discovery message includes the first serving cell access information of the first relay terminal, including:

[0241] The third discovery message includes the first serving cell access information of the first relay terminal and the fourth serving cell access information of the third relay terminal. The first serving cell access information or the fourth serving cell access information includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0242] In an 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 a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal and the serving 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 serving cell access information or the serving cell access information of other relay terminals includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

[0244] In an 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 other relay terminals in the serving cell access information list is set according to the relay forwarding order of the first relay terminal and other relay terminals.

[0245] In an 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 other relay terminal except the first relay terminal.

[0246] The device provided by the embodiment of the present application can implement Figure 6 each process implemented by the method embodiment, and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0247] See Figure 14 , an embodiment of the present application provides a communication processing device, which is applied to a first relay terminal. The device 1400 includes:

[0248] A second sending module 1401, configured to send a fourth discovery message to a next-hop relay terminal, where the fourth discovery message includes service cell access information of the first relay terminal, and the service cell access information includes at least one of a public land mobile network identifier to which the service cell belongs, a cell identifier, a TAC, and an RNAC, and the first relay terminal is a relay terminal directly connected to a base station.

[0249] In an implementation manner of this application, the service cell access information of the first relay terminal in the fourth discovery message is used to determine a service cell of a remote terminal.

[0250] The device provided in the embodiments of this application can implement Figure 7 each process implemented by the method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein again.

[0251] Figure 15 A schematic diagram of a hardware structure of a terminal according to an embodiment of this application is shown. The terminal 1500 includes, but is not limited to, at least some components such as 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.

[0252] Those skilled in the art can understand that the terminal 1500 may further include a power supply (such as a battery) for supplying power to each component. The power supply may be logically connected to the processor 1510 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. Figure 15 The terminal structure shown in

[0253] It should be understood that in the embodiments of the present application, the input unit 1504 may include a Graphics Processing Unit (GPU) 15041 and a microphone 15042. The graphics processor 15041 processes the image data of static pictures or videos obtained by an image capturing 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, for example, a liquid crystal display, an organic light emitting diode, etc. The user input unit 1507 includes at least one of a touch panel 15071 and other input devices 15072. The touch panel 15071 is also referred to as a touch screen. The touch panel 15071 may include two parts: a touch detection device and a touch controller. The 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, a joystick, which will not be elaborated herein.

[0254] In the embodiments of the present application, after receiving downlink data from a network-side device, the radio frequency unit 1501 may transmit it to the processor 1510 for processing; in addition, the radio frequency unit 1501 may send uplink data to the network-side device. Generally, 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, etc.

[0255] 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. Among them, the first storage area may store an operating system, application programs or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 1509 may include a volatile memory or a non-volatile memory, or alternatively, the memory 1509 may include a non-transitory memory. Among them, the non-volatile memory or the non-transitory 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. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synch link dynamic random access memory (SLDRAM), and a direct rambus random access memory (DRRAM). The memory 1509 in the embodiments of the present application includes but is not limited to these and any other suitable types of memories.

[0256] The processor 1510 may include one or more processing units; optionally, the processor 1510 integrates an application processor and a modem processor. Among them, the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above modem processor may not be integrated into the processor 1510 either.

[0257] The terminal provided by the embodiments of the present application can implement Figure 5 or Figure 6 or Figure 7 the various processes implemented by the method embodiments and achieve the same technical effects. To avoid repetition, they will not be described in detail here.

[0258] Such as Figure 16As shown in the figure, an embodiment of the present application further provides a terminal 1600, including a processor 1601 and a memory 1602. A program or instruction that can run on the processor 1601 is stored on the memory 1602. When the program or instruction is executed by the processor 1601, it implements the above Figure 5 or Figure 6 or Figure 7 each step of the method embodiment and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0259] An embodiment of the present application further provides a readable storage medium. A program or instruction is stored on the readable storage medium. When the program or instruction is executed by a processor, it implements Figure 5 or Figure 6 or Figure 7 the method and each process of the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0260] Among them, the processor is the processor in the terminal or network-side device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks, or optical discs, etc. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0261] Another embodiment of the present application provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run a program or instruction to implement the figure Figure 5 or Figure 6 or Figure 7 shown and each process of the above method embodiments and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0262] It should be understood that the chip mentioned in the embodiment of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0263] Another embodiment of the present application provides a computer program / program product. The computer program / program product is stored in a storage medium. The computer program / program product is executed by at least one processor to implement Figure 5 or Figure 6 or Figure 7 shown and each process of the above method embodiments and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0264] An embodiment of the present application further provides a communication system, including a remote terminal, a first relay terminal, and a third relay terminal;

[0265] Among them, the remote terminal is used to execute asFigure 5 The method described above, where the first relay terminal is used to execute as Figure 7 The method described above, where the third relay terminal is used to execute as Figure 6 the method described above.

[0266] The communication system includes a terminal and a network-side device, where the terminal is used to execute as Figure 5 or Figure 6 or Figure 7 each process of each of the above method embodiments, and can achieve the same technical effects. To avoid repetition, they will not be elaborated here.

[0267] It should be noted that in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out 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 a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0268] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, they can also be implemented by hardware. This computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disc, etc.) and includes several instructions for causing a terminal or a network-side device to execute the methods described in various embodiments of the present application.

[0269] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms of embodiments without departing from the purpose of the present application and the scope protected by the claims. These embodiments are all within the protection scope of the present application.

Claims

1. A communication processing method, characterized in that, it includes: The remote terminal receives a first discovery message sent by the previous-hop relay terminal; The remote terminal determines the serving cell of the remote terminal according to the first discovery message; Wherein, 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 relay terminal that the PC5 connection of the remote terminal can reach at the farthest; In the case that 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 the case that the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the tracking area TA of the remote terminal, the remote terminal executes the TA update process.

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

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

4. The method according to claim 1, characterized in that, The first discovery message includes a serving cell access information list, and the serving cell access information list includes the first serving cell access information of the first relay terminal and the serving 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. The first serving cell access information or the serving cell access information of other relay terminals includes at least one of the public land mobile network identifier to which the serving cell belongs, the cell identifier, the TAC, and the RNAC.

5. The method according to claim 4, characterized in that, The remote terminal determines the serving cell of the remote terminal according to the first discovery message, including: The remote terminal determines the relay terminal that the PC5 connection of the remote terminal can reach at the farthest as the second relay terminal according to the serving cell access information list in the first discovery message; The remote terminal determines the serving cell of the remote terminal as the serving cell of the second relay terminal.

6. The method according to claim 4, characterized in that, 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, characterized in that, it includes: The third relay terminal receives a 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; Wherein, at least one of the second discovery message and the third discovery message includes the first serving cell access information of the first relay terminal, the first discovery message is used for determining the serving cell of the remote terminal, 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 relay terminal with the farthest reachable PC5 connection of the remote terminal.

8. The method according to claim 7, characterized in that, When the third relay terminal sends a first discovery message to the remote terminal, it includes: If the measurement result of the measurement quantity corresponding to the first discovery message is greater than or equal to a first preset value, then the third relay terminal sends a first discovery message to the remote terminal.

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

10. The method according to claim 7, characterized in that, The first discovery message including the first serving cell access information of the first relay terminal includes: The first discovery message includes a serving cell access information list, the serving cell access information list includes the first serving cell access information of the first relay terminal, and the serving 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, and the first serving cell access information or the serving 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 serving cell belongs.

11. The method according to claim 7, characterized in that, When the third relay terminal sends a third discovery message to the next-hop relay terminal, it includes: If the measurement result of the measurement quantity corresponding to the third discovery message is greater than or equal to a second preset value, then the third relay terminal sends a third discovery message to the next-hop relay terminal.

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

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

14. The method according to claim 10 or 13, wherein, the order of the access information of the first serving cell of the first relay terminal and the 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, it includes: The first relay terminal sends a fourth discovery message to the next-hop relay terminal, the fourth discovery message includes the access information of the serving cell of the first relay terminal, the access information of the serving cell includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC, and the first relay terminal is a relay terminal directly connected to the base station.

17. The method according to claim 16, wherein, the access information of the serving cell 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, it includes: a first receiving module, configured to receive a first discovery message sent by a previous-hop relay terminal; a first determining module, configured to determine the serving cell of the remote terminal according to the first discovery message; wherein, 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 relay terminal that the PC5 connection of the remote terminal can reach at the farthest. The first processing module is configured to execute an RNA update process when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the RNA of the remote terminal; or execute a TA update process when the serving cell of the first relay terminal or the serving cell of the second relay terminal is outside the TA of the remote terminal.

19. The apparatus according to claim 18, wherein, 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 to which the serving cell belongs, a cell identifier, a tracking area code TAC, and a radio access network notification area code RNAC.

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

21. The apparatus according to claim 18, wherein, the first discovery message includes a serving cell access information list, the serving cell access information list includes first serving cell access information of the first relay terminal, and serving 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 serving cell access information or the serving cell access information of other relay terminals includes at least one of a public land mobile network identifier to which the serving cell belongs, a cell identifier, a TAC, and an RNAC.

22. A communication processing apparatus is applied to a third relay terminal, wherein, it includes: a second receiving module, configured to receive a second discovery message sent by a previous-hop relay terminal; 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; wherein, at least one of the second discovery message and the third discovery message includes first serving cell access information of the first relay terminal, the first discovery message is used for determining the serving cell of the remote terminal, 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 a base station, and the second relay terminal is the relay terminal that the PC5 connection of the remote terminal can reach at the farthest.

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

24. The apparatus 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 serving cell access information list, the serving cell access information list includes the first serving cell access information of the first relay terminal, and the serving 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, and at least one of the first serving cell access information and the serving cell access information of other relay terminals includes a public land mobile network identifier, a cell identifier, a TAC, and an RNAC to which the serving cell belongs.

25. A communication processing apparatus, applied to a first relay terminal, wherein, it includes: a second sending module, configured to send a fourth discovery message to a next-hop relay terminal, the fourth discovery message includes the serving cell access information of the first relay terminal, the 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, and the first relay terminal is a relay terminal directly connected to a base station.

26. A terminal, wherein, it includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor, and when the program or instruction is executed by the processor, it implements the steps of the method according to any one of claims 1 to 17.

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

28. A readable storage medium, wherein, a program or instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor of a terminal, it implements the steps of the method according to any one of claims 1 to 17.

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