Communication processing method and device, equipment and readable storage medium

Abstract

The invention discloses a communication processing method, device and equipment and a readable storage medium, and the method comprises the steps that a first relay terminal receives first information from a far-end terminal or a last-hop relay terminal of the first relay terminal, and the first information is used for requesting a system message; the first information comprises at least one SIB type and at least one of the following items: a terminal identifier of the remote terminal and a terminal identifier of a second relay terminal; wherein the second relay terminal is a relay terminal directly connected with a base station, and the first relay terminal is a relay terminal except the second relay terminal.

Description

Technical Field

[0001] This application belongs to the field of communication technologies, and particularly relates to a communication processing method, apparatus, device, and readable storage medium. Background Art

[0002] Currently, New Radio (NR) only supports single-hop UE-to-Network (U2N) relay, with only one relay UE. This application considers a multi-hop U2N relay scenario, that is, there are two or more Relay UEs. In this case, the system complexity increases sharply. In this scenario, how the Remote UE obtains system messages is an urgent problem to be solved. Summary of the Invention

[0003] Embodiments of this application provide a communication processing method, apparatus, device, and readable storage medium, to solve the problem of how a Remote UE obtains system messages in a multi-hop U2N relay scenario.

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

[0005] A first relay terminal receives first information from a remote terminal or from the previous-hop relay terminal of the first relay terminal, where the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of a second relay terminal;

[0006] Wherein, the second relay terminal is a relay terminal directly connected to a base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0007] In a second aspect, a communication processing method is provided, including:

[0008] A remote terminal sends first information, where the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of a second relay terminal; and / or,

[0009] The remote terminal receives second information, where the second information includes valid versions of at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of a second relay terminal;

[0010] Wherein, the second relay terminal is a relay terminal directly connected to a base station.

[0011] In a third aspect, a communication processing method is provided, including:

[0012] The second relay terminal receives first information for requesting system information, where the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or,

[0013] The second relay terminal receives second information, where the second information includes valid versions of at least one SIB type and also includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0014] Wherein, the second relay terminal is a relay terminal directly connected to the base station.

[0015] Fourthly, a communication processing method is provided, which is characterized by including:

[0016] The first relay terminal receives second information from the previous-hop relay terminal of the first relay terminal, where the second information includes valid versions of at least one SIB type and also includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0017] The first relay terminal sends the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0018] Wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is other relay terminals except the second relay terminal.

[0019] Fifthly, a communication processing method is provided, including:

[0020] The third relay terminal receives first system information of the serving cell from the fourth relay terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0021] Sixthly, a communication processing method is provided, including:

[0022] The fourth relay terminal sends the first system information to the third relay terminal or the remote terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0023] Seventhly, a communication processing device is provided, which is applied to the first relay terminal and includes:

[0024] A first receiving module, configured to receive first information from the remote terminal or from the previous-hop relay terminal of the first relay terminal, where the first information is for requesting system information, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0025] Among them, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0026] In an eighth aspect, there is provided a communication processing apparatus, which is applied to a remote terminal and includes:

[0027] A second sending module, configured to send first information, where the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or,

[0028] A second receiving module, configured to receive second information, where the second information includes valid versions of at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0029] Among them, the second relay terminal is a relay terminal directly connected to the base station.

[0030] In a ninth aspect, there is provided a communication processing apparatus, which is applied to a second relay terminal and includes:

[0031] A third receiving module, configured to receive first information, where the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or,

[0032] A fourth receiving module, configured to receive second information, where the second information includes valid versions of at least one SIB type and further includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0033] Among them, the second relay terminal is a relay terminal directly connected to the base station.

[0034] In a tenth aspect, there is provided a communication processing apparatus, which is applied to a first relay terminal and includes:

[0035] A fifth receiving module, configured to receive second information from the previous-hop relay terminal of the first relay terminal, where the second information includes valid versions of at least one SIB type and further includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0036] A third sending module, configured to send the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0037] Among them, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is other relay terminals except the second relay terminal.

[0038] In a tenth aspect, a communication processing device is provided, which is applied to a third relay terminal and includes:

[0039] A sixth receiving module, configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0040] In an eleventh aspect, a communication processing device is provided, which is applied to a fourth relay terminal and includes:

[0041] A fifth sending module, configured to send the first system information to a third relay terminal or a remote terminal, where the fourth relay terminal is a parent relay terminal of the third relay terminal.

[0042] In a twelfth aspect, a communication system is provided. The communication system includes a remote terminal, a first relay terminal, and a second relay terminal;

[0043] wherein, the remote terminal is configured to execute the method described in the first aspect or the fourth aspect, the second relay terminal is configured to execute the method described in the second aspect, and the first relay terminal is configured to execute the steps of the method described in the fourth aspect; or,

[0044] The communication system includes a third relay terminal and a fourth relay terminal. The third relay terminal is configured to execute the steps of the method described in the fifth aspect, and the fourth relay terminal is configured to execute the steps of the method described in the sixth aspect.

[0045] In a thirteenth aspect, a terminal is provided, 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 or the fourth aspect or the fifth aspect or the sixth aspect are implemented.

[0046] In a fourteenth aspect, a readable storage medium is provided. A program or instruction is stored on the readable storage medium. 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 or the fourth aspect or the fifth aspect or the sixth aspect are implemented.

[0047] In a fifteenth 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 instruction to implement the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0048] In a seventeenth aspect, a computer program / program product is provided. The computer program / program product is stored in a non-transitory storage medium and is executed by at least one processor to implement the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0049] In an eighteenth aspect, a communication system is provided. The communication system includes a terminal and a network-side device. The terminal is configured to execute the steps of the method described in the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect.

[0050] In an embodiment of the present application, a first relay terminal receives first information from a remote terminal or from the previous-hop relay terminal of the first relay terminal. The first information is used to request system information, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of a second relay terminal; wherein the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal. This can enable a remote terminal to obtain system information in a multi-hop U2N relay scenario, and avoid the problem that the remote terminal cannot communicate with the network side due to being in a deep coverage hole. Description of the Drawings

[0051] Figure 1 Schematic diagram of UE-to-Network relay;

[0052] Figure 2 Schematic diagram of request-based system information transmission in a single-hop scenario;

[0053] Figure 3 Schematic diagram of proactively pushed system information in a single-hop scenario;

[0054] Figure 4a 、 Figure 4b Schematic diagram of multi-hop L2 U2N relay network term definitions;

[0055] Figure 5 Schematic diagram of the architecture of the wireless communication system according to the embodiment of the present application;

[0056] Figure 6 One of the flowcharts of the communication processing method provided by the embodiment of the present application;

[0057] Figure 7 Another flowchart of the communication processing method provided by the embodiment of the present application;

[0058] Figure 8 Another flowchart of the communication processing method provided by the embodiment of the present application;

[0059] Figure 9 It is the fourth flowchart of the communication processing method provided by the embodiments of the present application;

[0060] Figure 10 It is the fifth flowchart of the communication processing method provided by the embodiments of the present application;

[0061] Figure 11 It is the sixth flowchart of the communication processing method provided by the embodiments of the present application;

[0062] Figure 12 It is the seventh flowchart of the communication processing method provided by the embodiments of the present application;

[0063] Figure 13 It is a schematic diagram of the network topology in a multi-hop scenario;

[0064] Figure 14 It is the eighth flowchart of the communication processing method provided by the embodiments of the present application;

[0065] Figure 15 It is one of the schematic diagrams of the communication processing device provided by the embodiments of the present application;

[0066] Figure 16 It is another schematic diagram of the communication processing device provided by the embodiments of the present application;

[0067] Figure 17 It is yet another schematic diagram of the communication processing device provided by the embodiments of the present application;

[0068] Figure 18 It is the fourth schematic diagram of the communication processing device provided by the embodiments of the present application;

[0069] Figure 19 It is the fifth schematic diagram of the communication processing device provided by the embodiments of the present application;

[0070] Figure 20 It is the sixth schematic diagram of the communication processing device provided by the embodiments of the present application;

[0071] Figure 21 It is one of the schematic diagrams of the terminal provided by the embodiments of the present application;

[0072] Figure 22 It is another schematic diagram of the terminal provided by the embodiments of the present application;

[0073] Figures 23a - 23b It is a schematic diagram of transmitting the first information provided by the embodiments of the present application;

[0074] Figures 24a - 24b It is a schematic diagram of transmitting the second information provided by the embodiments of the present application. Detailed implementation manners

[0075] 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 of 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 of protection of the present application.

[0076] The terms "first", "second", etc. in the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "or" in the present 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 an "or" relationship between the associated objects before and after.

[0077] It is worth pointing out that the technology described in the embodiments of the present 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 the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, 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.

[0078] I. Regarding the Sidelink (SL) Relay mechanism.

[0079] In the relay technology of a wireless communication system, one or more relays are added between the base station and the terminal (e.g., User Equipment (UE)), which are responsible for forwarding the wireless signal once or multiple times. That is, the wireless signal sent by the base station needs to go through multiple hops to reach the UE.

[0080] The wireless relay technology can not only be used to expand the 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 the penetration loss and improving the indoor coverage quality.

[0081] Taking the single-hop relay mechanism as an example, a wireless relay can split a base station-UE link into two links: base station-relay station and relay station-UE, so as to have the opportunity to replace a link with poor quality with two links with better quality to obtain higher link capacity and better coverage.

[0082] 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. A typical scenario is as Figure 1 shown.

[0083] Figure 1 The figure shows 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.

[0084] 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 the Public Safety service, 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.

[0085] II. In the single-hop scenario: System message acquisition of the Remote UE.

[0086] Mechanism 1: Request-based delivery mechanism.

[0087] See Figure 2 , and the specific steps are as follows:

[0088] Step 0: The Remote UE establishes a PC5 radio resource control (RRC) connection with the Relay UE.

[0089] Step 1: When the Remote UE meets at least one of the following conditions:

[0090] (1) The Remote UE has system message request information to be sent;

[0091] (2) The system message request information of the Remote UE changes;

[0092] The Remote UE sends the system message request information to the Relay UE. The system message request information is sent through a PC5-RRC message, and the system message request information includes at least one SIB type;

[0093] Step 2: The Relay UE receives the PC5-RRC (e.g., RemoteUEInformationSidelink) message sent by the Remote UE.

[0094] If the Relay UE determines that it does not store a valid version of the at least one system information block (SIB) type, it executes a system message acquisition process (i.e., the Uu on demand SI procedure) based on the at least one SIB type to obtain a valid version of the at least one SIB type from the serving base station of the Relay UE.

[0095] If the Relay UE determines that it has stored a valid version of the at least one SIB type, it executes Step 3.

[0096] Step 3: The Relay UE sends system message forwarding information to the Remote UE. The system message forwarding information is sent through a PC5-RRC message, and the system message forwarding information includes the valid version of the at least one SIB type.

[0097] Step 4: If the Relay UE determines that the valid version of the at least one SIB type has changed, it sends the system message forwarding information to the Remote UE again. The system message forwarding information is sent through PC5-RRC (message), and the system message forwarding information includes the updated valid version of the at least one SIB type.

[0098] It can be understood that Mechanism 1 is applicable to any SIB type (such as SIB1, 2, 3,... etc.).

[0099] Mechanism 2: Unsolicited forwarding mechanism.

[0100] See Figure 3 , and the specific steps are as follows:

[0101] Step 0: Discover and establish a PC5 connection.

[0102] Step 1: Transmit SIB1 through a PC5-RRC message.

[0103] Step 2: Determine whether SIB1 has an update.

[0104] Step 3: Transmit SIB1 through a PC5-RRC message.

[0105] It can be understood that Mechanism 2 is mainly applicable to SIB1.

[0106] III. Terminology definitions for multi-hop relay networks:

[0107] For ease of understanding and description, in the application, the multi-hop layer 2 (Layer 2, L2) U2N relay network is simply referred to as the multi-hop relay network. Relative to Figure 4a and Figure 4b the remote UE in

[0108] (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;

[0109] Optionally, the donor relay UE may include, but is not limited to, one of the following: 1) A Relay UE that undertakes a 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.

[0110] (2) Access Relay UE: A relay UE that establishes a PC5 connection with a remote UE and helps the remote UE forward uplink and downlink data and signaling is the access relay UE for that remote UE.

[0111] (3) Intermediate Relay UE: A relay UE located between the access relay UE and the host relay UE that helps the remote UE complete the forwarding of data and signaling between the access relay UE and the host 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 host relay UE of a remote relay UE. It should be noted that the intermediate relay UE can also include the access relay UE, that is, all relay UEs between the host relay UE and the remote UE are understood as intermediate relay UEs, as Figure 4b shown.

[0112] Optionally, the intermediate relay UE can 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.

[0113] (4) Downstream UE: All UEs that access the network through a relay UE become the downstream UEs of that relay UE.

[0114] 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 host relay UE.

[0115] (5) Upstream UE: A relay UE that forwards uplink and downlink data and signaling for a UE is the upstream UE of that UE.

[0116] For example, in the uplink direction, the access relay UE, the intermediate relay UE, or the host relay UE is the upstream UE of the remote UE, and the host relay UE and the intermediate relay UE are the upstream UEs of the access relay UE.

[0117] In the downlink direction, the intermediate relay UE or the intermediate relay UE is the upstream UE of the host relay UE.

[0118] (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.

[0119] For example, the host relay UE is the parent UE of the intermediate relay UE, the intermediate relay UE is the child UE of the host relay UE, the intermediate relay UE is the parent UE of the access relay UE, the access relay UE is the child UE of the intermediate relay, the access relay UE is the parent UE of the remote UE, and the remote UE is the child UE of the access relay UE.

[0120] The access relay UE also has the identity of the remote UE relative to the intermediate relay UE; and the intermediate relay UE has the identity of the remote UE relative to the host relay UE, and so on. This will not be elaborated further in the following embodiments of the present application.

[0121] Figure 5 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 51 and a network side device 52.

[0122] Among them, the terminal 51 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, TVs, 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 (such as 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 51 is not limited in the embodiments of this application.

[0123] The network-side device 52 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 specific technical terms. 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.

[0124] 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.

[0125] 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.

[0126] See Figure 6 , the embodiments of this application provide a communication processing method, which is executed by a first relay terminal, and the specific steps include: Step 601.

[0127] Step 601: The first relay terminal receives first information from a remote terminal or from the previous-hop relay terminal of the first relay terminal. The first information is used to request system information and includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0128] Wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0129] For Figure 4a example, the access relay terminal receives the first information from the remote terminal, or the intermediate relay terminal receives the first information from the access relay terminal. That is, the first relay terminal can be an access relay terminal or an intermediate relay terminal.

[0130] In an embodiment of the present application, all the content of the first information can be carried by a PC5 RRC message. For example, a new information element (IE) is extended based on an existing PC5 RRC message (message) or a new PC5 RRC message, as Figure 23a shown.

[0131] In another embodiment of the present application, part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer (Sidelink Relay Adaption layer, SRAP) sub-header, as Figure 23b shown. For example, at least one SIB type is carried by a PC5 RRC message, and the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal are carried by the PC5 adaptation layer sub-header. These two signaling design methods each have their advantages and disadvantages. Figure 23a The signaling of the method shown has strong signaling scalability, but the complexity that the relay terminal needs to handle is high. Figure 23b The method shown uses data plane transparent forwarding, and the processing of the relay terminal is simple. However, due to the fixed format, the content scalability is low.

[0132] In an embodiment of the present application, the terminal identifier is at least one of a local (Local) identifier, a layer 2 (Layer 2) identifier, and a user information identifier; wherein, the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0133] Optionally, the Layer 2 identifier includes at least one of the following: Source Layer-2 ID, Destination Layer-2 ID. It can be used by the access stratum (AS layer) or protocol layers above the AS layer (upper layer) to identify terminals participating in different communication processes, such as unicast communication, groupcast communication, and broadcast communication.

[0134] Optionally, the User info ID can be a 48-bit string, which can be used by the access stratum (AS layer) or protocol layers above the AS layer (upper layer) to identify different terminal identities or roles, such as the announcer, discoverer, and discoveree in the Discovery process; the Source UE and Target UE in the PC5 unicast link establishment process.

[0135] In an embodiment of the present application, the method further includes:

[0136] The first relay terminal sends the first information to the next-hop relay terminal of the first relay terminal.

[0137] In an embodiment of the present application, the first relay terminal sending the first information to the next-hop relay terminal of the first relay terminal includes:

[0138] If a first condition is satisfied, the first relay terminal sends the first information to the next-hop relay terminal of the first relay terminal;

[0139] Wherein, the first condition includes at least one of the following:

[0140] (1) The first relay terminal is in a state of Out-Of-Coverage (OOC);

[0141] (2) The value of the measurement of the serving cell of the first relay terminal is less than or equal to a first preset threshold;

[0142] Optionally, the measurement includes but is not limited to Reference Signal Received Power (RSRP).

[0143] It is understandable that no specific limitation is imposed on the first preset threshold in this embodiment.

[0144] (3) The serving cell of the first relay terminal is different from the serving cell of the second relay terminal;

[0145] (4) The first relay terminal does not have the ability to receive system information or forward system information.

[0146] In an implementation manner of the present application, the first relay terminal sending the first information to the next-hop relay terminal of the first relay terminal includes:

[0147] The first relay terminal determines the next-hop relay terminal of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the first information to the next-hop relay terminal.

[0148] For Figure 4a example, the first relay terminal is an access relay terminal, and the next-hop relay terminal of the first relay terminal is an intermediate access terminal; the first relay terminal is an intermediate relay terminal, and the next-hop relay terminal of the first relay terminal is a host relay terminal.

[0149] In an implementation manner of the present application, the method further includes:

[0150] If a second condition is satisfied, the first relay terminal stops forwarding the first information;

[0151] Among them, the second condition includes at least one of the following:

[0152] (1) The first relay terminal is in a state of being within network coverage (In-Coverage, IC);

[0153] (2) The value of the measurement quantity of the serving cell of the first relay terminal is greater than or equal to a second preset threshold;

[0154] Optionally, the measurement quantity includes but is not limited to RSRP.

[0155] It is understandable that no specific limitation is imposed on the second preset threshold in this embodiment.

[0156] (3) The serving cell of the first relay terminal is the same as the serving cell of the second relay terminal;

[0157] (4) The first relay terminal has the ability to receive system information or forward system information;

[0158] (5) The first relay terminal has stored a valid version of the at least one SIB type.

[0159] In an implementation manner of the present application, the method further includes:

[0160] The second condition does not include that the first relay terminal has stored a valid version of the at least one SIB type, and when the first relay terminal has not stored the valid version of the at least one SIB type, the first relay terminal obtains the valid version of the at least one SIB type.

[0161] In this embodiment, it is realized that a remote terminal obtains system information in a multi-hop U2N relay scenario, avoiding the problem that the remote terminal cannot communicate with the network side due to being in a deep coverage vulnerability.

[0162] See Figure 7 , an embodiment of the present application provides a communication processing method, which is applied to a remote terminal, and the specific steps include: Step 701.

[0163] Step 701: The remote terminal sends a first message, the first message is used to request system information, and the first message includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or the remote terminal receives a second message, the second message includes a valid version of the at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0164] Wherein, the second relay terminal is a relay terminal directly connected to the base station.

[0165] Taking Figure 4a , Figure 4b as an example, the second relay terminal is the host relay terminal.

[0166] In an implementation manner of the present application, all the content of the second message can be carried by a PC5 RRC message, for example, by making a new IE extension based on an existing PC5 RRC message or a new PC5 RRC message, as Figure 24a shown.

[0167] In another implementation manner of the present application, part of the content of the second message is carried by a PC5 RRC message, and the remaining content of the second message is carried by a PC5 adaptation layer (Sidelink Relay Adaption layer, SRAP) sub-header, as Figure 24b shown. For example, the valid version of the at least one SIB type is carried by a PC5 RRC message, and the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal are carried by the PC5 adaptation layer sub-header. These two signaling design methods each have their own advantages and disadvantages. Figure 24aThe signaling of the shown method has strong scalability, but the complexity that the relay terminal needs to handle is high. Figure 24b The shown method uses transparent forwarding on the data plane, and the processing of the relay terminal is simple. However, due to the fixed format, the content scalability is low.

[0168] In an implementation manner of the present application, the terminal identifier is at least one of a Local identifier, a layer 2 identifier, and a user information identifier; wherein, the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0169] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier, a destination layer 2 identifier. It can be used for protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0170] Optionally, the user information identifier can be a 48-bit string, which can be used for protocol layers above the access layer or the AS layer to identify different terminal identities or roles, such as a broadcaster, a discoverer, and a discovered device in the discovery process; a source terminal and a destination terminal in the unicast connection establishment process.

[0171] In this embodiment, it realizes the acquisition of system messages by the remote terminal in a multi-hop U2N relay scenario, and avoids the problem that the remote terminal cannot communicate with the network side due to being in a deep coverage hole.

[0172] See Figure 8 , the embodiment of the present application provides a communication processing method, which is applied to a second relay terminal, and the specific steps include: step 801 or step 802.

[0173] Step 801: The second relay terminal receives the first information, the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0174] Step 802: The second relay terminal receives the second information, the second information includes valid versions of at least one SIB type and further includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0175] Wherein, the second relay terminal is a relay terminal directly connected to the base station.

[0176] Take Figure 4a 、 Figure 4b as an example, the second relay terminal is a host relay terminal. The host relay terminal receives the first information from the intermediate relay terminal, and the host relay terminal receives the second information from the service mechanism.

[0177] In an implementation manner of the present application, the terminal identifier is at least one of a Local identifier, a layer 2 identifier, and a user information identifier; wherein, there is a mapping relationship between the Local identifier and the layer 2 identifier or there is a mapping relationship between the Local identifier and the user information identifier.

[0178] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier, a destination layer 2 identifier. It can be used for protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0179] Optionally, the user information identifier can be a 48-bit string, which can be used for protocol layers above the access layer or the AS layer to identify different terminal identities or roles, such as a broadcaster, a discoverer, and a discovered device during the discovery process; a source terminal and a destination terminal during the unicast connection establishment process.

[0180] In an implementation manner of the present application, all the content of the first information is carried by a PC5 RRC message, or, a part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer sub-header.

[0181] In an implementation manner of the present application, all the content of the second information is carried by a PC5 RRC message, or, a part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer sub-header.

[0182] In this embodiment, it realizes that a remote terminal obtains system information in a multi-hop U2N relay scenario, avoiding the problem that the remote terminal cannot communicate with the network side due to being in a deep coverage vulnerability.

[0183] See Figure 9 , 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 901 and step 902.

[0184] Step 901: The first relay terminal receives second information from the previous-hop relay terminal of the first relay terminal, and the second information includes at least one valid version of the SIB type and further includes at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of a second relay terminal;

[0185] Step 902: The first relay terminal sends the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0186] Wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is other relay terminals except the second relay terminal.

[0187] Taking Figure 4a as an example, the first relay terminal is an access relay terminal. The access relay terminal receives the second information from the intermediate relay terminal and sends the second information to the remote terminal. Alternatively, the first relay terminal is an intermediate relay terminal. The intermediate relay terminal receives the first information from the host relay terminal and sends the second information to the access relay terminal.

[0188] In an embodiment of the present application, the terminal identifier is at least one of a Local identifier, a layer 2 identifier, and a user information identifier; wherein, there is a mapping relationship between the Local identifier and the layer 2 identifier or there is a mapping relationship between the Local identifier and the user information identifier.

[0189] Optionally, the layer 2 identifier includes at least one of the following: a source layer 2 identifier, a destination layer 2 identifier. It can be used for protocol layers above the access layer or the AS layer to identify terminals participating in different communication processes, such as unicast communication, multicast communication, and broadcast communication.

[0190] Optionally, the user information identifier can be a 48-bit string, which can be used for protocol layers above the access layer or the AS layer to identify different terminal identities or roles, such as a broadcaster, a discoverer, and a discovered device during the discovery process; a source terminal and a destination terminal during the unicast connection establishment process.

[0191] In an embodiment of the present application, the first relay terminal sending the second information to the remote terminal or the next-hop relay terminal of the first relay terminal includes:

[0192] The first relay terminal determines the remote terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and sends the second information to the remote terminal;

[0193] Or,

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

[0195] In an embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer sub-header.

[0196] In this embodiment, it is realized that the remote terminal obtains system information in a multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage vulnerability and cannot communicate with the network side.

[0197] See Figure 10 , this embodiment of the present application provides a communication processing method, which is applied to a third relay terminal, and the specific steps include:

[0198] Step 1001: The third relay terminal receives the first system information of the serving cell from the fourth relay terminal, and the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0199] Taking Figure 4a as an example, the third relay terminal is an intermediate relay terminal. The intermediate relay terminal receives the first system information from the host relay terminal, and the intermediate relay terminal forwards the first system information to the access relay terminal.

[0200] Taking Figure 4a as an example, the third relay terminal is an access relay terminal. The access relay terminal receives the first system information from the intermediate relay terminal, and the access relay terminal forwards the first system information to the remote terminal. For example, when the remote terminal completes establishing a PC5 RRC connection or after establishing a PC5 RRC connection, the access relay terminal actively forwards the first system information to the remote terminal.

[0201] Optionally, the first system information includes but is not limited to SIB1.

[0202] In an implementation manner of the present application, the method further includes:

[0203] The third relay terminal receives the second system information sent by the fourth relay terminal;

[0204] The third relay terminal sends the second system information to the target terminal, and the target terminal is the downstream terminal of the third relay terminal.

[0205] Taking Figure 4a as an example, the third relay terminal is an intermediate relay terminal. The intermediate relay terminal receives the second system information from the host relay terminal, and the intermediate relay terminal sends the second system information to the access relay terminal (the downstream terminal of the intermediate relay terminal).

[0206] Taking Figure 4a as an example, the third relay terminal is an access relay terminal. The access relay terminal receives the second system information from the intermediate relay terminal, and the access relay terminal sends the second system information to the remote terminal (the downstream terminal of the intermediate relay terminal).

[0207] Optionally, the second system information includes at least one of the following: other SIBs such as SIB2, SIB3,... except SIB1.

[0208] In this embodiment, it is realized that the remote terminal obtains system information in a multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage vulnerability and cannot communicate with the network side.

[0209] See Figure 11 , an embodiment of the present application provides a communication processing method, which is applied to a fourth relay terminal, and the specific steps include step 1101.

[0210] Step 1101: The fourth relay terminal sends the first system information to the third relay terminal or the remote terminal, and the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0211] Taking Figure 4a as an example, the fourth relay terminal is an intermediate relay terminal, and the intermediate relay terminal actively sends the first system information to the access relay terminal.

[0212] Taking Figure 4a as an example, the fourth relay terminal is an access relay terminal, and the access relay terminal actively sends the first system information to the remote terminal.

[0213] In an embodiment of the present application, the fourth relay terminal sending the first system information to the remote terminal includes:

[0214] When the PC5 RRC connection between the remote terminal and the fourth relay terminal is established or after it is established, the fourth relay terminal sends the first system information to the remote terminal.

[0215] In this embodiment, it is realized that the remote terminal obtains system information in a multi-hop U2N relay scenario, avoiding the problem that the remote terminal is in a deep coverage vulnerability and cannot communicate with the network side.

[0216] The following introduces several alternative embodiments of the present application in combination with specific implementation manners.

[0217] In Embodiment 1 and Embodiment 2, the remote terminal is Remote UE, the second relay terminal is RelayUE-4, the first relay terminal is Relay UE-1, Relay UE-2 or Relay UE-3, and the first information is system message request information.

[0218] Embodiment 1: The Donor Relay UE (host Relay UE) obtains and forwards the system message.

[0219] Taking the number N of relay UEs as 4 as an example, as Figure 12 shown. The Donor Relay UE is Relay UE 4:

[0220] Step 0: The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3, and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4.

[0221] Step 1: When the Remote UE meets at least one of the following conditions:

[0222] (1) The Remote UE has system message request information to be sent;

[0223] (2) The system message request information of the Remote UE changes;

[0224] It sends the system message request information to Relay UE-1. The system message request information includes at least one of the following:

[0225] (1) At least one SIB type;

[0226] (2) The UE ID of the Remote UE. Optionally, the UE ID is identified by the local ID value or the L2 ID value.

[0227] (3) The UE ID of Relay UE-4 (i.e., the Donor Relay UE). Optionally, the UE ID is identified by the local ID value or the L2 ID value.

[0228] Step 2: After receiving the system message request information sent by the Remote UE, Relay UE-1 performs one of the following actions:

[0229] Action 1: Determine to forward the system message request information to the next-hop Relay UE-2 according to the UE ID information included in the system message request information;

[0230] Action 2: Forward the system message request information to the next-hop Relay UE-2;

[0231] The difference between the above Action 1 and Action 2 lies in the complexity of the network topology. Among them, Action 1 is applicable to a relatively complex topology structure (such as Figure 13 the topology structure shown), and there may be multiple different Relay UEs for the previous-hop or next-hop of each Relay UE; Action 2 is applicable to a deterministic topology structure, and the previous-hop or next-hop of each Relay UE is a determined Relay UE.

[0232] Step 3: Relay UE-2 receives the system message request information sent by Relay UE-1 and performs one of the following actions:

[0233] Action 1: Determine to forward the system message request information to the next-hop Relay UE-3 according to the UE ID information included in the system message request information;

[0234] Action 2: Forward the system message request information to the next-hop Relay UE-3;

[0235] Step 4: Relay UE-3 receives the system message request information sent by Relay UE-2 and performs one of the following actions:

[0236] (1) Determine to forward the system message request information to the next-hop Relay UE-4 according to the UE ID information included in the system message request information;

[0237] (2) Forward the system message request information to the next-hop Relay UE-4;

[0238] Step 5: Relay UE-4 receives the system message request information sent by Relay UE-3 and further makes the following judgments according to at least one SIB type information included in the system message request information:

[0239] (1) If Relay UE-4 determines that it does not store a valid version of the at least one SIB type, based on the at least one SIB type, perform a system message acquisition process (i.e., Uu on demand SI procedure) to obtain a valid version of the at least one SIB type from the serving base station of the Relay UE. Then perform Step 6.

[0240] (2) If Relay UE-4 determines that it has stored a valid version of the at least one SIB type, directly perform Step 6.

[0241] Step 6: Relay UE-4 sends system message forwarding information to Relay UE-3, and the system message forwarding information includes at least one of the following contents:

[0242] (1) A valid version of the at least one SIB type.

[0243] (2) The UE ID of the Remote UE; optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0244] (4) The UE ID of Relay UE-4 (i.e., the Donor Relay UE); optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0245] Step 7: Relay UE-3 receives the system message forwarding information sent by Relay UE-4 and performs one of the following actions:

[0246] (1) Determine to forward the system message forwarding information to the next-hop Relay UE-2 according to the UE ID information included in the system message forwarding information;

[0247] (2) Forward the system message forwarding information to the next-hop Relay UE-2;

[0248] Step 8: Relay UE-2 receives the system message forwarding information sent by Relay UE-3 and performs one of the following actions:

[0249] (1) Determine to forward the system message forwarding information to the next-hop Relay UE-1 according to the UE ID information included in the system message forwarding information;

[0250] (2) Forward the system message forwarding information to the next-hop Relay UE-1;

[0251] Step 9: Relay UE-1 receives the system message forwarding information sent by Relay UE-2 and performs one of the following actions:

[0252] Action 1: Determine to forward the system message forwarding information to the Remote UE according to the UE ID information included in the system message forwarding information;

[0253] Action 2: Forward the system message forwarding information to the Remote UE;

[0254] Step 10: If Relay UE-4 determines that the valid version of the at least one SIB type has changed, the condition for resending the system message forwarding information is satisfied, and the system message forwarding information includes the updated valid version of the at least one SIB type.

[0255] When the condition in Step 10 is satisfied, Steps 11-14 are executed. The process is the same as Steps 6-9 and will not be elaborated here.

[0256] It should be noted that the role of carrying the L2 ID in the system message request information in Step 1 is to determine the next-hop Relay UE. For example, Figure 13 For example.

[0257] Transmission direction (taking Relay UE-2 as an example), when the system message request information received by Relay UE-2 contains the L2 ID of Remote UE-1 or the L2 ID of Relay UE-4, then determine that the next hop is Relay UE-3; if it contains the L2 ID of Remote UE-2 or the L2 ID of Relay UE-7, then determine that the next hop is Relay UE-6.

[0258] Receiving direction (taking Relay UE-2 as an example), when the system message forwarding information received by Relay UE-2 contains the L2 ID of Remote UE-1 or the L2 ID of Relay UE-4, then determine that the next hop is Relay UE-1; if it contains the L2 ID of Remote UE-2 or the L2 ID of Relay UE-7, then determine that the next hop is Relay UE-5.

[0259] Embodiment 2: An Intermediate Relay UE (Intermediate Relay UE) is used to obtain and forward the execution system message.

[0260] Taking the number N of relay UEs as 4 as an example, as Figure 14 shown. The Intermediate Relay UE includes Relay UE1, Relay UE 2, Relay UE3, and the Intermediate Relay UE that executes system message forwarding is Relay UE 2:

[0261] Step 0: The Remote UE establishes a PC5 RRC connection with Relay UE-1, Relay UE-1 establishes a PC5 RRC connection with Relay UE-2, Relay UE-2 establishes a PC5 RRC connection with Relay UE-3 (optional), and Relay UE-3 establishes a PC5 RRC connection with Relay UE-4 (optional).

[0262] Step 1: When the Remote UE meets at least one of the following conditions:

[0263] (1) The Remote UE has system message request information to be sent;

[0264] (2) The system message request information of the Remote UE changes;

[0265] Send the system message request information to Relay UE-1, and the system message request information includes at least one of the following contents:

[0266] (1) At least one SIB type;

[0267] (2) The UE ID of the Remote UE; Optionally, the UE ID is identified by the local ID value or the L2 ID value.

[0268] (3) The UE ID of the Relay UE-4 (i.e., the Donor Relay UE); Optionally, the UE ID is identified by the local ID value or the L2 ID value.

[0269] Step 2: After receiving the system message request information sent by the Remote UE, before performing one of the following actions, Relay UE-1 first determines whether Relay UE-1 meets the conditions for undertaking system message reception and / or forwarding. The conditions for undertaking system message reception and / or forwarding include at least one of the following:

[0270] Condition 1) Its own network coverage status:

[0271] The state of being within network coverage (in-coverage, IC) is regarded as meeting Condition 1; the state of being outside network coverage (out-of-coverage, OOC) is regarded as not meeting Condition 1.

[0272] Condition 2) The value of the measurement of the Uu serving cell of Relay UE-1:

[0273] The value of the measurement of the Uu serving cell, RSRP, being higher than the preset threshold TH is regarded as meeting Condition 2; the value of the measurement of the Uu serving cell, RSRP, being lower than or equal to the preset threshold (Threshold, TH) is regarded as not meeting Condition 2.

[0274] Condition 3) Whether the Uu serving cell of Relay UE-1 and the Uu serving cell of the Donor Relay UE are the same: The same cell is regarded as meeting Condition 3; different cells are regarded as not meeting Condition 3.

[0275] Condition 4) Whether Relay UE-1 has the willingness (volunteer) or ability to undertake system message reception and / or forwarding: Having the willingness or ability is regarded as meeting Condition 4; having no willingness or ability is regarded as not meeting Condition 4.

[0276] Step 3: If Relay UE-1 determines that it does not meet the conditions for undertaking system message reception and / or forwarding, it performs one of the following actions:

[0277] Action 1: Determine to forward the system message request information to the next-hop Relay UE-2 according to the UE ID information included in the system message request information;

[0278] Action 2: Forward the system message request information to the next-hop Relay UE-2;

[0279] It should be noted that the difference between the above Action 1 and Action 2 lies in the different complexities of the network topology. Action 1 is applicable to relatively complex topology structures (such as Figure 13 the topology structure shown), and there may be multiple different Relay UEs for the previous-hop or next-hop of each Relay UE; Action 2 is applicable to deterministic topology structures, and the previous-hop or next-hop of each Relay UE is a determined Relay UE.

[0280] Step 4: Relay UE-2 receives the system message request information sent by Relay UE-1. Before performing one of the following actions, first determine whether Relay UE-2 meets the conditions for undertaking system message reception and / or forwarding. The conditions for undertaking system message reception and / or forwarding include:

[0281] Condition 1) The network coverage status of Relay UE-2: The state of being within network coverage (in-coverage, IC) is regarded as meeting Condition 1, and the state of being outside network coverage (out-of-coverage, OOC) is regarded as not meeting Condition 1.

[0282] Condition 2) The value of the measurement quantity of the Uu serving cell of Relay UE-2: The value of the measurement quantity of the Uu serving cell, RSRP, higher than the preset threshold TH is regarded as meeting the condition; the value of the measurement quantity of the Uu serving cell, RSRP, lower than or equal to the preset threshold TH is regarded as not meeting the condition.

[0283] Condition 3) Whether the Uu serving cell of Relay UE-2 and the Uu serving cell of the Donor Relay UE are the same: The same cell is regarded as meeting the condition; different cells are regarded as not meeting the condition.

[0284] Condition 4) Whether Relay UE-2 has the willingness (volunteer) or ability to undertake system message reception and / or forwarding: Having the willingness or ability is regarded as meeting the condition; having no willingness or ability is regarded as not meeting the condition.

[0285] If at least one condition is met during system message reception and / or forwarding, then stop forwarding the system message request information.

[0286] Step 5: Further judge as follows according to at least one SIB type information included in the system message request information:

[0287] (1) If Relay UE-2 determines that it does not store a valid version of the at least one SIB type, based on the at least one SIB type, execute a system message acquisition process (i.e., Uu on demand SI procedure) to obtain a valid version of the at least one SIB type from the serving base station of the Relay UE. Then execute Step 6;

[0288] (2) If Relay UE-2 determines that it has stored a valid version of the at least one SIB type, directly execute Step 6.

[0289] Step 6: Relay UE-2 sends system message forwarding information to Relay UE-1, and the system message forwarding information includes at least one of the following:

[0290] (1) A valid version of the at least one SIB type.

[0291] (2) The UE ID of the Remote UE; optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0292] (3) The UE ID of Relay UE-4 (i.e., the Donor Relay UE); optionally, the UE ID is identified by a local ID value or an L2 ID value.

[0293] Step 7: After Relay UE-1 receives the system message forwarding information sent by Relay UE-2, perform one of the following actions:

[0294] Action 1: Determine to forward the system message forwarding information to the Remote UE according to the UE ID information included in the system message forwarding information;

[0295] Action 2: Forward the system message forwarding information to the next-hop Remote UE;

[0296] Step 8: If Relay UE-2 determines that a valid version of the at least one SIB type has changed, the condition for re-sending the system message forwarding information is met, and the system message forwarding information includes the updated valid version of the at least one SIB type.

[0297] When the condition in Step 8 is met, execute Steps 9-10, and the process is the same as Steps 6-7 and will not be elaborated here.

[0298] Embodiment 3: Active multi-hop forwarding of system messages

[0299] Any relay terminal actively forwards system messages, and the forwarding includes at least one of the following:

[0300] (1) The relay terminal actively forwards the SIB1 of the serving cell received from the parent relay terminal;

[0301] (2) When a new remote UE accesses through the parent relay terminal (for example, when establishing a PC5 RRC connection or after establishing a PC5 RRC connection), the parent relay terminal actively sends SIB1 to the new remote UE;

[0302] (3) Part of the system messages received from the PC5-RRC messages of the parent relay terminal are included in its own PC5-RRC messages and sent to the downstream UE. For example, it includes: SIB2, 3, 4,... SIBx,....

[0303] See Figure 15 , an embodiment of the present application provides a communication processing device, which is applied to the first relay terminal. The device 1500 includes:

[0304] A first receiving module 1501, configured to receive first information from a remote terminal or from the previous-hop relay terminal of the first relay terminal, where the first information is used to request system messages, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0305] Wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

[0306] In an embodiment of the present application, the terminal identifier is at least one of a Local identifier, a layer 2 identifier, and a user information identifier; wherein, the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0307] In an embodiment of the present application, the device further includes:

[0308] A first sending module, configured to send the first information to the next-hop relay terminal of the first relay terminal.

[0309] In an embodiment of the present application, the first sending module is further configured to: if a first condition is satisfied, send the first information to the next-hop relay terminal of the first relay terminal;

[0310] Wherein, the first condition includes at least one of the following:

[0311] The first relay terminal is in a state outside the network coverage;

[0312] The value of the measurement quantity of the serving cell of the first relay terminal is less than or equal to a first preset threshold;

[0313] The serving cell of the first relay terminal is different from the serving cell of the second relay terminal;

[0314] The first relay terminal does not have the ability to receive system information or forward system information.

[0315] In an embodiment of the present application, the first sending module is further configured to: determine the next-hop relay terminal of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and send the first information to the next-hop relay terminal.

[0316] In an embodiment of the present application, the device further includes:

[0317] A first processing module, configured to stop forwarding the first information if a second condition is satisfied;

[0318] Wherein, the second condition includes at least one of the following:

[0319] The first relay terminal is in a state within the network coverage;

[0320] The value of the measurement quantity of the serving cell of the first relay terminal is greater than or equal to a second preset threshold;

[0321] The serving cell of the first relay terminal is the same as the serving cell of the second relay terminal;

[0322] The first relay terminal has the ability to receive system information or forward system information;

[0323] The first relay terminal has stored a valid version of the at least one SIB type.

[0324] In an embodiment of the present application, the device further includes:

[0325] A first obtaining module, configured to, when the second condition does not include that the first relay terminal has stored a valid version of the at least one SIB type, and when the first relay terminal has not stored a valid version of the at least one SIB type, obtain a valid version of the at least one SIB type.

[0326] In an embodiment of the present application, all the content of the first information is carried by a PC5 RRC message, or, part of the content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer sub-header.

[0327] 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 elaborated here.

[0328] See Figure 16 , the embodiment of the present application provides a communication processing device, which is applied to a remote terminal. The device 1600 includes:

[0329] A second sending module 1601, configured to send first information, where the first information is used to request system information, and the first information includes at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or,

[0330] A second receiving module 1602, configured to receive second information, where the second information includes at least one valid version of the SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal;

[0331] Wherein, the second relay terminal is a relay terminal directly connected to the base station.

[0332] In an embodiment of the present application, the terminal identifier is at least one of a local Local identifier, a layer 2 identifier, and a user information identifier; wherein, the Local identifier has a mapping relationship with the layer 2 identifier or the Local identifier has a mapping relationship with the user information identifier.

[0333] In an embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or, part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer sub-header.

[0334] The device provided by the embodiment of the present application can implement Figure 7 each process implemented by the method embodiment and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0335] See Figure 17 , the embodiment of the present application provides a communication processing device, which is applied to a second relay terminal. The device 1700 includes:

[0336] A third receiving module 1701, configured to receive first information for requesting system messages, where the first information includes at least one SIB type and at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of the second relay terminal; or,

[0337] A fourth receiving module 1702, configured to receive second information, where the second information includes valid versions of at least one SIB type and further includes at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of the second relay terminal;

[0338] Wherein, the second relay terminal is a relay terminal directly connected to the base station.

[0339] In an embodiment of the present application, the terminal identifier is at least one of a local Local identifier, a layer 2 identifier, and a user information identifier; wherein, there is a mapping relationship between the Local identifier and the layer 2 identifier or there is a mapping relationship between the Local identifier and the user information identifier.

[0340] In an embodiment of the present application, all content of the first information is carried by a PC5 RRC message, or, partial content of the first information is carried by a PC5 RRC message, and the remaining content of the first information is carried by a PC5 adaptation layer sub-header.

[0341] In an embodiment of the present application, all content of the second information is carried by a PC5 RRC message, or, partial content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer sub-header.

[0342] The device provided by the embodiment of the present application can implement Figure 8 each process implemented by the method embodiment and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0343] See Figure 18 , the embodiment of the present application provides a communication processing device applied with a first relay terminal. The device 1800 includes:

[0344] A fifth receiving module 1801, configured to receive second information from the previous-hop relay terminal of the first relay terminal, where the second information includes valid versions of at least one SIB type and further includes at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of a second relay terminal;

[0345] A third sending module 1802, configured to send the second information to the remote terminal or the next-hop relay terminal of the first relay terminal;

[0346] Among them, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is other relay terminals except the second relay terminal.

[0347] In an embodiment of the present application, the terminal identifier is at least one of a local Local identifier, a layer 2 identifier, and a user information identifier; wherein, there is a mapping relationship between the Local identifier and the layer 2 identifier or there is a mapping relationship between the Local identifier and the user information identifier.

[0348] In an embodiment of the present application, the third sending module 1802 is further configured to:

[0349] Determine the remote terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and send the second information to the remote terminal;

[0350] Or,

[0351] Determine at least one of the next-hop relay terminals of the first relay terminal according to at least one of the terminal identifier of the remote terminal and the terminal identifier of the second relay terminal, and send the second information to the next-hop relay terminal of the first relay terminal.

[0352] In an embodiment of the present application, all the content of the second information is carried by a PC5 RRC message, or, part of the content of the second information is carried by a PC5 RRC message, and the remaining content of the second information is carried by a PC5 adaptation layer sub-header.

[0353] The device provided by the embodiments of the present application can implement Figure 9 the various processes implemented by the method embodiments and achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0354] See Figure 19 , the embodiments of the present application provide a communication processing method, which is applied to a third relay terminal. The device 1900 includes:

[0355] A sixth receiving module 1901, configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0356] In an embodiment of the present application, the device further includes:

[0357] A seventh receiving module, configured to receive second system information sent by the fourth relay terminal;

[0358] A fourth sending module, configured to send the second system information to a target terminal, where the target terminal is a downstream terminal of the third relay terminal.

[0359] The device provided by the embodiment of the present application can implement Figure 10 each process implemented by the method embodiment, and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0360] See Figure 20 , the embodiment of the present application provides a communication processing method, which is applied to a fourth relay terminal. The device 1900 includes:

[0361] A fifth sending module 2001, configured to send first system information to a third relay terminal or a remote terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

[0362] In an implementation manner of the present application, the fifth sending module 2001 is further configured to:

[0363] When the PC5 RRC connection between the remote terminal and the fourth relay terminal is established or after it is established, the fourth relay terminal sends the first system information to the remote terminal.

[0364] The device provided by the embodiment of the present application can implement Figure 11 each process implemented by the method embodiment, and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0365] Figure 21 It is a schematic diagram of the hardware structure of a terminal according to an embodiment of the present application. The terminal 2100 includes but is not limited to at least some components such as a radio frequency unit 2101, a network module 2102, an audio output unit 2103, an input unit 2104, a sensor 2105, a display unit 2106, a user input unit 2107, an interface unit 2108, a memory 2109, and a processor 2110.

[0366] Those skilled in the art can understand that the terminal 2100 may further include a power supply (such as a battery) for supplying power to each component. The power supply can be logically connected to the processor 2110 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 21 The terminal structure shown in

[0367] It should be understood that in the embodiments of the present application, the input unit 2104 may include a Graphics Processing Unit (GPU) 21041 and a microphone 21042. The graphics processor 21041 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 2106 may include a display panel 21061, and the display panel 21061 may be configured in the form of, for example, a liquid crystal display, an organic light emitting diode, etc. The user input unit 2107 includes at least one of a touch panel 21071 and other input devices 21072. The touch panel 21071 is also referred to as a touch screen. The touch panel 21071 may include two parts: a touch detection device and a touch controller. The other input devices 21072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, which will not be elaborated herein.

[0368] In the embodiments of the present application, after receiving downlink data from a network-side device, the radio frequency unit 2101 may transmit it to the processor 2110 for processing; in addition, the radio frequency unit 2101 may send uplink data to the network-side device. Generally, the radio frequency unit 2101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0369] The memory 2109 can be used to store software programs or instructions and various data. The memory 2109 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data. 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 2109 may include a volatile memory or a non-volatile memory, or alternatively, the memory 2109 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 synchronous link dynamic random access memory (SLDRAM), and a direct rambus random access memory (DRRAM). The memory 2109 in the embodiments of the present application includes but is not limited to these and any other suitable types of memories.

[0370] The processor 2110 may include one or more processing units; optionally, the processor 2110 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-mentioned modem processor may not be integrated into the processor 2110 either.

[0371] The terminal provided by the embodiments of the present application can implement Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 each process implemented by the method embodiments and achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0372] As Figure 22 shown, an embodiment of the present application further provides a terminal 2200, including a processor 2201 and a memory 2202. A program or instruction that can run on the processor 2201 is stored on the memory 2202. When the program or instruction is executed by the processor 2201, it implements the above Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 steps of each method embodiment and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0373] 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 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 the method and each process of each of the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0374] Among them, the processor is the processor in the terminal or network-side device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk, or an optical disc, etc. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0375] 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 Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 shown and each process of each of the above method embodiments and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0376] 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, a system chip, a chip system, or a system-on-chip, etc.

[0377] 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 6 or Figure 7 or Figure 8 orFigure 9 or Figure 10 or Figure 11 as shown and each process of the above-mentioned various method embodiments, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0378] The embodiment of the present application further provides a communication system, which includes a remote terminal, a first relay terminal, and a second relay terminal; wherein, the remote terminal is used to execute as Figure 7 each process of the method embodiment described above, and can achieve the same technical effects, the second relay terminal is used to execute as Figure 8 each process of the method embodiment described above, and can achieve the same technical effects, the first relay terminal is used to execute as Figure 6 or Figure 9 each process of the method embodiment described above, and can achieve the same technical effects.

[0379] The embodiment of the present application further provides a communication system, which includes a third relay terminal and a fourth relay terminal. The third relay terminal is used to execute as Figure 10 each process of the method embodiment described above, and can achieve the same technical effects, the fourth relay terminal is used to execute as Figure 11 each process of the method embodiment described above, and can achieve the same technical effects.

[0380] The communication system includes a terminal and a network-side device. The terminal is used to execute as Figure 6 or Figure 7 or Figure 8 or Figure 9 or Figure 10 or Figure 11 or Figure 12 and each process of the above-mentioned various method embodiments, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0381] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not explicitly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising 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 the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0382] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus the necessary general hardware platforms, and of course, can also be implemented by hardware. The computer software products are stored in storage media (such as ROM, RAM, magnetic disks, optical disks, etc.) and include several instructions for causing a terminal or a network-side device to execute the methods described in various embodiments of the present application.

[0383] 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. All these embodiments fall within the protection scope of the present application.

Claims

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

2. The method according to claim 1, characterized in that, the terminal identifier is at least one of a local Local identifier, a layer 2 identifier, and a user information identifier; wherein, there is a mapping relationship between the Local identifier and the layer 2 identifier or there is a mapping relationship between the Local identifier and the user information identifier.

3. The method according to claim 1, characterized in that, the method further includes: the first relay terminal sends the first information to a next-hop relay terminal of the first relay terminal.

4. The method according to claim 3, characterized in that, the first relay terminal sending the first information to a next-hop relay terminal of the first relay terminal includes: if a first condition is satisfied, the first relay terminal sends the first information to a next-hop relay terminal of the first relay terminal; wherein, the first condition includes at least one of the following: the first relay terminal is in a state outside network coverage; a measurement value of the serving cell of the first relay terminal is less than or equal to a first preset threshold; the serving cell of the first relay terminal is different from the serving cell of the second relay terminal; the first relay terminal does not have the ability to receive or forward system information.

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

6. The method according to claim 3, characterized in that, the method further includes: if a second condition is satisfied, the first relay terminal stops forwarding the first information; wherein, the second condition includes at least one of the following: the first relay terminal is in a state within network coverage; a measurement value of the serving cell of the first relay terminal is greater than or equal to a second preset threshold; the serving cell of the first relay terminal is the same as the serving cell of the second relay terminal; the first relay terminal has the ability to receive or forward system information; the first relay terminal has stored a valid version of the at least one SIB type.

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

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

9. A communication processing method, wherein, comprising: a remote terminal sending first information for requesting system information, the first information including at least one system information block SIB type and at least one of the following: a terminal identifier of the remote terminal, a terminal identifier of a second relay terminal; and / or, the remote terminal receiving second information, the second information including a valid version of at least one SIB type and at least one of the following: a terminal identifier of the remote terminal, a terminal identifier of the second relay terminal; wherein, the second relay terminal is a relay terminal directly connected to a base station.

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

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

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

13. A communication processing method, wherein, comprising: a second relay terminal receiving first information for requesting system information, the first information including at least one SIB type and at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of the second relay terminal; or, the second relay terminal receiving second information, the second information including a valid version of at least one SIB type and further including at least one of the following: a terminal identifier of a remote terminal, a terminal identifier of the second relay terminal; wherein, the second relay terminal is a relay terminal directly connected to a base station.

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

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

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

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

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

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

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

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

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

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

24. The method according to claim 23, wherein, the fourth relay terminal sending the first system information to the remote terminal comprises: when or after the establishment of the PC5 radio resource control (RRC) connection between the remote terminal and the fourth relay terminal is completed, the fourth relay terminal sends the first system information to the remote terminal.

25. A communication processing apparatus, applied to a first relay terminal, wherein, it comprises: a first receiving module, configured to receive first information from a remote terminal or from the previous-hop relay terminal of the first relay terminal, the first information being used to request system messages, the first information including at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is a relay terminal other than the second relay terminal.

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

27. A communication processing apparatus, applied to a remote terminal, wherein, it comprises: a second sending module, configured to send first information, the first information being used to request system messages, the first information including at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or, a second receiving module, configured to receive second information, the second information including at least one valid version of the SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; wherein, the second relay terminal is a relay terminal directly connected to the base station.

28. A communication processing apparatus, applied to a second relay terminal, wherein, it comprises: a third receiving module, configured to receive first information, the first information being used to request system messages, the first information including at least one SIB type and at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; or, a fourth receiving module, configured to receive second information, the second information including at least one valid version of the SIB type and further including at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; Wherein, the second relay terminal is a relay terminal directly connected to the base station.

29. A communication processing device that applies a first relay terminal, Characterized in that, It includes: A fifth receiving module, configured to receive second information from the previous-hop relay terminal of the first relay terminal, where the second information includes at least one valid version of the SIB type and further includes at least one of the following: the terminal identifier of the remote terminal, the terminal identifier of the second relay terminal; A third sending module, configured to send the second information to the remote terminal or the next-hop relay terminal of the first relay terminal; Wherein, the second relay terminal is a relay terminal directly connected to the base station, and the first relay terminal is other relay terminals except the second relay terminal.

30. A communication processing device applied to a third relay terminal, Characterized in that, It includes: A sixth receiving module, configured to receive first system information of a serving cell from a fourth relay terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

31. A communication processing device applied to a fourth relay terminal, Characterized in that, It includes: A fifth sending module, configured to send the first system information to the third relay terminal or the remote terminal, where the fourth relay terminal is the parent relay terminal of the third relay terminal.

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

33. A terminal, Characterized in that, It includes 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 according to any one of claims 1 to 24 are implemented.

34. A readable storage medium, Characterized in that, A program or instruction is stored on the readable storage medium. When the program or instruction is executed by the processor of the terminal, the steps of the method according to any one of claims 1 to 24 are implemented.

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