Information acquisition method, information transmission method, related device, and readable storage medium

Abstract

An information acquisition method, an information transmission method, an associated device, and a readable storage medium, the information acquisition method including a far-end terminal performing a first operation, the first operation including at least a first sub-operation when the far-end terminal and the relay terminal are in the same cell coverage, and the first operation being a second sub-operation when the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, or the first operation being determined based on whether the far-end terminal has searched for a target cell, the first operation being determined based on an indication of a minimum system information set, and the first operation being determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal, wherein the first sub-operation is acquiring system information via a first interface, the first interface being an air interface between the far-end terminal and the cell, and the second sub-operation is acquiring system information by the relay terminal.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from Chinese Patent Application No. 202110739145.3 filed in China on June 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application belongs to the field of communication technology, and specifically relates to an information acquisition method, an information transmission method, related devices, and readable storage media. [Background technology]

[0003] A communication system may use a terminal to provide a relay service between the terminal and the network (UE to Network, U2N), where the terminal providing the relay service is called a relay terminal (i.e., a relay UE), and the terminal to which the relay service is provided is called a far-end terminal (i.e., a remote UE). The far-end terminal establishes a Radio Resource Control (RRC) connection with a serving base station through the relay terminal to achieve wireless backhaul.

[0004] The system information is important information for the base station to define the terminal behavior. However, when the far-end terminal needs to establish a wireless backhaul channel with the serving base station through the relay terminal, no relevant solution has been proposed so far regarding how the far-end terminal obtains the system information from the base station. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide an information acquisition method, an information transmission method, related devices and readable storage medium that can solve the system information acquisition problem of a far-end terminal. [Means for solving the problem]

[0006] According to a first aspect, there is provided a method for obtaining information, the method comprising: and a far-end terminal performing a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0007] According to a second aspect, there is provided a method of transmitting information, the method comprising: transmitting at least a portion of system information from the relay terminal to the far-end terminal when a second condition is satisfied; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0008] According to a third aspect, there is provided a method of transmitting information, the method comprising: The network side device transmits configuration information, and the configuration information is used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and the relay terminal transmitting a fourth portion of the system information to the far-end terminal upon request of the far-end terminal.

[0009] According to a fourth aspect, there is provided an information acquisition device, the device comprising: a first execution module for executing a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0010] According to a fifth aspect, there is provided an information transmission apparatus, the apparatus comprising: a second execution module for transmitting at least some system information to the far-end terminal when a second condition is met; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0011] According to a sixth aspect, there is provided an information transmission apparatus, the apparatus comprising: a third execution module for transmitting configuration information, the configuration information being used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and the relay terminal transmitting a fourth portion of the system information to the far-end terminal upon request of the far-end terminal.

[0012] According to a seventh aspect, there is provided a terminal comprising a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of the first or second aspect.

[0013] According to an eighth aspect, there is provided a network side device, the network side device including a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method according to the third aspect.

[0014] According to a ninth aspect, there is provided a terminal including a processor and a communications interface, wherein: When the terminal is a far-end terminal, the communication interface is used to perform a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0015] When the terminal is a relay terminal, the communication interface used to transmit at least some system information to a far-end terminal when a second condition is met; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0016] According to a tenth aspect, there is provided a network side device including a processor and a communication interface, wherein the communication interface: used to transmit configuration information, the configuration information being used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and the relay terminal transmitting a fourth portion of the system information to the far-end terminal upon request of the far-end terminal.

[0017] According to an eleventh aspect, there is provided a readable storage medium having a program or instructions stored on the readable storage medium, the program or instructions realizing the steps of the method according to the first, second or third aspect when executed by a processor.

[0018] According to a twelfth aspect, there is provided a chip, the chip including a processor and a communication interface, the communication interface coupled to the processor, the processor running a program or instructions and adapted to implement a method according to the first, second or third aspect.

[0019] According to a thirteenth aspect, there is provided a computer program product stored on a non-volatile storage medium, the computer program product being executed by at least one processor to implement a method according to the first, second or third aspect.

[0020] According to a fourteenth aspect, there is provided a communications device, the communications device being configured to perform a method according to the first, second or third aspect. [Effects of the Invention]

[0021] The embodiments of the present application provide a different scenario in which the far-end terminal can acquire system information through a first interface and / or a relay terminal, and the first interface is the air interface between the far-end terminal and the cell, thereby improving the effectiveness of the far-end terminal in acquiring system information and further improving the service experience of the far-end terminal. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application; [Figure 2] FIG. 1 is a schematic diagram of a Layer 2 sidelink relay control plane protocol stack according to an embodiment of the present application. [Figure 3] FIG. 1 is a schematic diagram of a Layer 3 sidelink relay control plane protocol stack according to an embodiment of the present application. [Figure 4] 1 is a flowchart of an information acquisition method according to an embodiment of the present application. [Figure 5] 1 is a flowchart illustrating an information transmission method according to an embodiment of the present application. [Figure 6] 2 is a second flowchart of an information transmission method according to an embodiment of the present application. [Figure 7] 1 is a structural diagram of an information acquisition device according to an embodiment of the present application; [Figure 8] 1 is a structural diagram of an information transmitting device according to an embodiment of the present application; [Figure 9] 2 is a second structural diagram of an information transmitting device according to an embodiment of the present application. [Figure 10] 1 is a structural diagram of a communication device according to an embodiment of the present application; [Figure 11] FIG. 2 is a structural diagram of a terminal according to an embodiment of the present application; [Figure 12] FIG. 2 is a structural diagram of a network-side device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0023] The following clearly describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application fall within the scope of protection of the present application.

[0024] The terms "first," "second," etc. in the specification and claims of this application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It should be understood that terms used in this manner are interchangeable where appropriate, so that embodiments of this application may be performed in orders other than those illustrated or described herein, and that objects distinguished by "first" and "second" are generally of the same type and do not limit the number of objects; for example, a first object may be one or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the related objects.

[0025] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be applied to 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), and other systems. The terms "system" and "network" in the embodiments of the present application are always used interchangeably, and the described techniques may be used in the above-mentioned systems and radio technologies as well as other systems and radio technologies. Although the following description describes New Radio (NR) systems for illustrative purposes and uses NR terminology in most of the following description, these technologies may also be used in applications other than NR system applications, such as sixth generation (6G) systems. th This may be applied to 6G (6th Generation) communication systems.

[0026] For ease of understanding, the following describes some contents related to the embodiments of the present application.

[0027] 1. Overview of Sidelink.

[0028] A sidelink is a wireless link between terminals in a communication system (e.g., New Radio (NR) or Long Term Evolution (LTE)), and two terminals can realize direct data transmission between them via the sidelink. The wireless link between two terminals may be called a PC5 link and runs the PC5 protocol.

[0029] The communication protocol considers providing a relay service between a terminal and a network using a terminal. As shown in Fig. 1, the wireless communication system may include a remote terminal (UE) 11, a relay terminal (relay UE) 12, and a network side device 13. Here, the relay terminal 12 is a terminal that provides a relay service, the remote terminal 11 is a terminal to which the relay service is provided, the link between the relay terminal 12 and the remote terminal 11 is a PC5 link running a sidelink interface protocol, and the link between the relay terminal 12 and the network side device 13 is a Uu link running a Uu link protocol and used for downlink and uplink.

[0030] The sidelink radio interface control plane includes the PC5 Radio Resource Control (RRC) protocol, which runs on top of the Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) layers, and the Media Access Control (MAC) and physical layers at the bottom. The sidelink radio interface user plane includes, from top to bottom, the Service Data Adaptation Protocol (SDAP), PDCP, RLC, MAC, and physical layers.

[0031] In the embodiments of the present application, the terminal may be referred to as a terminal device or a user terminal (UE), and the terminal may be a terminal-side device such as a mobile phone, a tablet personal computer, a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), a wearable device, a vehicle user equipment (VUE), a pedestrian user equipment (PUE), etc., and the wearable device includes a smart watch, a bracelet, an earphone, glasses, etc. It should be noted that the embodiments of the present application are not limited to a specific type of terminal.

[0032] The network side equipment may be a base station or a core network, where the base station may be called a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a wireless local area network (WLAN) access point, a wireless fidelity (WiFi) node, a transmitting receiving point (TRP), or any other suitable term in the art, and as long as the same technical effect is achieved, the base station is not limited to a specific technical term. For illustrative purposes, the embodiments of this application only take base stations in an NR system as examples, but do not limit the specific type of base station.

[0033] 2. Overview of Layer (L) 2 sidelink relay and L3 sidelink relay.

[0034] 2 and 3 show the backhaul link control plane protocol stack based on Layer 2 relaying and the backhaul link control plane protocol stack based on Layer 3 sidelink relaying, respectively.

[0035] For a backhaul link based on Layer 2 sidelink relaying, the far-end UE has one PC5 RRC connection (only the Uu RRC protocol stack is shown in the figure) to control the sidelink connection, and one RRC connection with the base station to control the connection and service provision with the base station.

[0036] For a backhaul link based on Layer 3 sidelink relaying, the far-end UE has one PC5 RRC connection with the relay UE and no Uu RRC connection with the base station. The protocol stack for Layer 3 relaying is omitted.

[0037] 3. NR system information.

[0038] The NR system information may include a Master Information Block (MIB) and a series of System Information Blocks (SIBs).

[0039] Based on the content contained in the system information, it can be divided into minimum system information (Minimum SI) and other system information (Other SI).

[0040] Here, Minimum SI includes basic messages for initial access and obtaining other system information, mainly including MIB and SIB1.

[0041] The MIB message contains cell barring status information and physical layer information required to obtain further system information, such as the configuration of the Control Resource Set (CORESET) #0. The MIB message is carried on the Broadcast Channel (BCH) and is broadcast periodically.

[0042] The SIB1 message defines scheduling information for messages and other system information blocks, such as uplink and downlink bandwidth part (BWP) information, physical random access channel (PRACH) configuration information, time division duplex (TDD) configuration, etc. The SIB1 message is periodically broadcast by the base station or notified to the UE by dedicated signaling in the RRC_CONNECTED state.

[0043] Other SI covers all system information that is not broadcast in Minimum SI. These SIBs can be transmitted in several ways: periodically broadcasting them like minimum SI; when the base station is not broadcasting them, broadcasting and reception by the base station can be requested to UEs in RRC idle (RRC_IDLE) or RRC inactive (RRC_INACTIVE) state based on the system information scheduling information configuration in SIB1; and in RRC_CONNECTED state, transmitting them to UEs on the Downlink Shared Channel (DL-SCH) in a dedicated manner. Other SI mainly includes the following information:

[0044] SIB2: Indicates cell reselection information.

[0045] SIB3: Indicates the frequency message of the serving cell and the same-frequency neighboring cell information for cell reselection, and includes the frequency parameters for cell reselection.

[0046] SIB4: Indicates other NR inter-frequency neighbor cell information, including common frequency parameters for cell reselection and dedicated parameters for cell reselection.

[0047] SIB5: Indicates LTE System Frequency Information and Cell Messages and contains common frequency parameters for cell reselection.

[0048] SIB6 and SIB7: Contains notification and auxiliary information for the Earthquake and Tsunami Warning System (ETWS).

[0049] SIB8: Indicates a Commercial Mobile Alert System (CMAS) notification message.

[0050] SIB9: Indicates Global Positioning System (GPS) time and Coordinated Universal Time (UTC) information.

[0051] SIB10: Indicates the related configuration of the Non-Public Network (NPN).

[0052] SIB11: Indicates the measurement configuration of the UE in RRC_IDLE and RRC_INACTIVE states.

[0053] SIB12: Indicates NR sidelink configuration.

[0054] SIB13 and SIB14: Specifies the relevant configuration for LTE vehicle wireless communication technology (Vehicle to X, V2X).

[0055] In the following, the embodiments of the present application will be described in detail by means of several examples and their application scenarios in conjunction with the drawings.

[0056] Please refer to Figure 4, which is a flowchart of an information acquisition method according to an embodiment of the present application. The information acquisition method of Figure 4 may be performed by a far-end terminal.

[0057] As shown in FIG. 4, the information acquisition method may include the following steps.

[0058] In step 401, the far-end terminal performs a first operation.

[0059] In an embodiment of the present application, the first operation specifically includes: a first sub-operation, the first sub-operation being to obtain system information via a first interface, the first interface being an air interface between the far-end terminal and a cell, for example a Uu interface; and a second sub-operation which is to obtain system information by the relay terminal.

[0060] That is, in the embodiment of the present application, the far-end terminal can obtain system information through the first interface and / or the relay terminal, and the system information may include, but is not limited to, system information of a target cell, where the target cell is a serving cell covering the relay terminal.

[0061] It should be noted that when at least two pieces of system information are acquired by the relay terminal, the manner in which the far-end terminal acquires different pieces of system information through the relay terminal may be different, for example, system information a may be spontaneously transmitted by the relay terminal, system information b may be transmitted by the relay terminal based on the request of the far-end terminal, system information c may be directly broadcast by the relay terminal, and system information d may be forwarded by the relay terminal.

[0062] In the embodiment of the present application, the specific implementation form of the first operation may be determined based on at least one of, but not limited to, whether the far-end terminal has cell coverage, whether the far-end terminal and the relay terminal are in the same cell coverage, an indication of a minimum system information set, and whether a sidelink connection has been established between the far-end terminal and the relay terminal.

[0063] Optionally, the first operation comprises: 1) when the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; 2) When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell that covers the relay terminal; 3) the first operation is determined based on an indication of a minimum system information set; and 4) The first operation may satisfy at least one of the following conditions, but is not limited to this: 1) the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal;

[0064] In the embodiment of the present application, whether the far-end terminal and the relay terminal are in the same cell coverage may be determined by, but is not limited to, determining whether the identifier information of the first serving cell of the first interface is the same as the identifier information of the second serving cell of the relay terminal. In a specific implementation, if the identifier information of the first serving cell and the second serving cell are the same, it indicates that the far-end terminal and the relay terminal are in the same cell coverage; otherwise, it indicates that the far-end terminal and the relay terminal are not in the same cell coverage.

[0065] In 1), the first operation may include only the first sub-operation, or may include the first sub-operation and the second sub-operation, that is, the far-end terminal can obtain at least part of the system information through the first interface, and the other part of the system information may be obtained through the first interface or by the relay terminal, which may be determined according to actual circumstances, and the embodiments of the present application are not limited thereto.

[0066] In 2), in the first implementation, the far-end terminal may obtain all system information through a relay terminal. In the second implementation, the specific implementation form of the first operation may be determined based on whether the far-end terminal has searched for the target cell. In the second implementation, the far-end UE may first search for the target cell, and then determine whether to obtain system information through the first interface or through a relay terminal based on the search result.

[0067] In 3), the specific implementation form of the first operation may be determined based on the instruction of the minimum system information set. As can be understood, in this case, the far-end terminal acquires system information other than the minimum system information set based on the first operation. The far-end terminal may acquire the minimum system information set through the first interface or the far-end terminal.

[0068] In a specific implementation, the minimum system information set may include indication information for indicating a manner or path for the far-end terminal to acquire system information other than the minimum system information set. Optionally, the indication information may be an independent piece of system information in the minimum system information set, or may be carried in any one of the system information in the minimum system information set. Specifically, the indication information may be determined according to actual circumstances, and the embodiments of the present application are not limited thereto.

[0069] In this case, the manner in which the far-end terminal acquires system information may be consistent with the manner in which the far-end terminal acquires system information indicated by the minimum system information set. When the minimum system information set indicates that the system information is acquired by the relay terminal, the first operation is the second sub-operation; If the minimum system information set indicates that the system information is obtained through the first interface, the first operation is the first sub-operation; and When the minimum system information set instructs that the system information is acquired by the first interface and the relay terminal, the first operation may satisfy at least one of the following: the first sub-operation includes the first sub-operation and the second sub-operation.

[0070] Alternatively, when the minimum system information set indicates that the system information is to be acquired via the first interface and the relay terminal, the minimum system information set may further indicate which system information is to be acquired via the first interface and / or which system information is to be acquired via the relay terminal, thereby further improving the effectiveness of the far-end terminal in acquiring the corresponding system information.

[0071] In practical applications, the network side device may flexibly set the indication of the minimum system information set according to the actual situation.

[0072] In 4), the specific implementation form of the first operation may be determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal.

[0073] Optionally, the first operation comprises: When a side link connection is established between the far-end terminal and the relay terminal, the first operation is the second sub-operation; When a side link connection is not established between the far-end terminal and the relay terminal, the first operation may be the first sub-operation.

[0074] It should be noted that 4) may be used in at least one of the following situations: the far-end terminal and the relay terminal are in the same cell coverage; the far-end terminal and the relay terminal are not in the same cell coverage; and the far-end terminal does not have cell coverage.

[0075] The information acquisition method of the present application provides a different scenario in which the far-end terminal can acquire system information through a first interface and / or a relay terminal, and the first interface is the air interface between the far-end terminal and the cell, thereby improving the effectiveness of the far-end terminal in acquiring system information and further improving the service experience of the far-end terminal.

[0076] The following will specifically explain the above-mentioned 1).

[0077] Optionally, when the first operation includes at least a first sub-operation, the system information of a first portion of the system information is acquired by the first interface, and the system information of a second portion of the system information is acquired by at least one of the first interface and the relay terminal.

[0078] In a specific implementation, the system information specifically included in the first part of the system information and the second part of the system information may be predetermined, for example, may be determined by a protocol or configured by a network-side device, etc. Furthermore, the first part of the system information and the second part of the system information may be flexibly adjusted according to actual conditions, and may be specifically determined according to actual conditions, and the embodiments of the present application are not limited thereto.

[0079] Optionally, the first portion of system information comprises: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, System information broadcast by the target cell; system information that the relay terminal does not transfer; The information may include, but is not limited to, at least one of the following:

[0080] When specifically implemented, the system information that the relay terminal does not transmit may include at least one of system information that the relay terminal does not support transmission of and system information that the relay terminal does not transmit.

[0081] The system information requested by the far-end terminal may include, but is not limited to, at least one of system information related to sidelink and system information related to sidelink relay.

[0082] Optionally, the second portion of system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and At least a part of the updated system information may be included, but is not limited to this.

[0083] In the examples of the present application, at least a part may be understood as a part or all.

[0084] In a specific implementation, at least some of the system information that the relay terminal supports for transmission may be indicated by first information transmitted by the relay terminal, and the first information may be carried in a broadcast message, a groupcast message, or dedicated signaling. That is, the relay terminal may indicate the system information that it supports for transmission by a manner such as broadcast, groupcast, or unicast.

[0085] The system information that the target cell can provide may be indicated by SIB1, and the far-end terminal may obtain SIB1 via the first interface or the relay terminal.

[0086] Alternatively, the updated at least part of the system information may be indicated by at least one of, but not limited to, the minimum system information set, the sidelink discovery signal, the sidelink relay discovery signal, the broadcast message of the relay terminal, and the groupcast message of the relay terminal. That is, the updated system information may be indicated by the relay terminal, the system information in the minimum system information set, the sidelink discovery signal, or the sidelink relay discovery signal.

[0087] It should be noted that the information contained in the first part of the system information and the second part of the system information do not overlap, for example, the first part of the system information and the second part of the system information each contain different system information, or the first part of the system information and the second part of the system information each contain different parts of the same system information.

[0088] For example, when the first part of the system information includes a minimum system information set, the second part of the system information includes system information other than the minimum system information set, and when the second part of the system information includes a minimum system information set, the first part of the system information includes system information other than the minimum system information set. In an embodiment of the present application, the far-end terminal may obtain the minimum system information set via a first interface or a relay terminal.

[0089] In this alternative embodiment, the second part of the system information may be acquired by at least one of the first interface and the relay terminal. In a specific implementation, the specific acquisition manner of the second part of the system information may be determined by a protocol or configured by a network-side device, or may be determined according to actual circumstances, and the embodiments of the present application are not limited thereto.

[0090] Optionally, obtaining the second portion of system information comprises: a) the far-end terminal acquires the second part of system information through the first interface or the relay terminal; b) the far-end terminal acquires the second part of the system information through at least one of the first interface and the relay terminal in descending order of priority for acquiring the system information of the first interface and the relay terminal; c) when the far-end terminal fails to acquire the second part of the system information through the first interface, acquiring the second part of the system information through the relay terminal; d) if the far-end terminal fails to acquire the second part of the system information by the relay terminal, the far-end terminal acquires the second part of the system information by the first interface.

[0091] In a), all the system information in the second part of the system information is acquired by the first interface or the relay terminal, and the manner of acquiring the second part of the system information in a) may be determined by a protocol, but is not limited thereto.

[0092] In b), the priority level of each acquisition path may be agreed upon by a protocol or indicated by a network side device, and then, in descending order of priority level of each acquisition path, some or all of the system information in the second part of the system information is acquired preferentially through the acquisition path with the highest priority level.

[0093] In c) and d), it may be possible to determine in advance which acquisition route will be used to acquire the system information preferentially, and after failing to acquire the system information via this acquisition route, an attempt will be made to acquire the system information via any one of the other acquisition routes until the acquisition of the system information is successful.

[0094] The second realization method in 2) above will be specifically explained below.

[0095] Optionally, when the first operation is determined based on whether the far end terminal has searched for a target cell, the first operation is When a first condition is satisfied, the first operation includes at least the first sub-operation; and if a first condition is not satisfied, the first operation is the second sub-operation; Here, the first condition includes that the far-end terminal searches for the target cell and that the far-end terminal is within the coverage of the target cell.

[0096] In this alternative embodiment, when the far-end terminal searches for the target cell and the far-end terminal is within the coverage of the target cell, the implementation form of the first operation is the same as the implementation form of the first operation in 1), and for details, please refer to the above description, and no further description will be given here.

[0097] When the far-end terminal has not searched for the target cell, or when the far-end terminal has searched for the target cell but is not within the coverage of the target cell, the far-end terminal may obtain all system information through a relay terminal.

[0098] The following is a specific description of the situation in which the far-end terminal obtains system information through the relay terminal.

[0099] 1. The method for the far-end terminal to obtain system information via the relay terminal.

[0100] In an embodiment of the present application, the behavior of the relay terminal transmitting system information to the far-end terminal may include at least one of the relay terminal transmitting system information to the far-end terminal voluntarily, and the relay terminal transmitting system information to the far-end terminal based on a request from the far-end terminal, i.e., after the relay terminal receives a request from the far-end terminal, transmitting the system information to the far-end terminal in response to the request.

[0101] Furthermore, when the relay terminal transmits the system information to the far-end terminal autonomously, the relay terminal may transmit the system information by broadcast, groupcast or unicast.

[0102] In implementation, the behavior of the relay terminal transmitting system information to the far-end terminal may be stipulated by a protocol, configured by network side devices, or specifically determined according to actual conditions, and the embodiments of the present application are not limited thereto. The system information spontaneously transmitted by the relay terminal and the system information transmitted upon request may be stipulated by a protocol, configured by network side devices, or the like, and the system information spontaneously transmitted by the relay terminal and the system information transmitted upon request may at least partially overlap or not overlap. Specifically, the behavior may be determined according to actual conditions, and the embodiments of the present application are not limited thereto.

[0103] Optionally, when the first operation is the second sub-operation, at least a part of the system information is broadcast or groupcast by the relay terminal.

[0104] That is, when the far-end terminal acquires the system information through the relay terminal, the far-end terminal may broadcast or groupcast at least a part of the system information, and may further transmit or forward the other part of the system information through a PC5 message.

[0105] Alternatively, the broadcast or groupcast period of the at least some system information may be an integer multiple of the transmission period of the sidelink relay discovery signal. Furthermore, the broadcast or groupcast period of the at least some system information may be equal to the transmission period of the sidelink relay discovery signal, and the broadcast or groupcast offset of the at least some system information may be equal to the transmission period of the sidelink relay discovery signal.

[0106] In particular, the broadcasting or groupcasting of at least some of the system information may be implemented in various ways. Optionally, the broadcasting or groupcasting of at least some of the system information may be implemented in the following manner: the at least some system information is transmitted via a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool; and wherein the at least some system information is transmitted by a sidelink data communication resource pool.

[0107] In implementation, the specific manner in which the broadcast or groupcast of at least some of the system information is realized may be configured by the target cell, and may be agreed upon (predefined) or preconfigured by a protocol.

[0108] For example, it may be predefined to transmit using a sidelink relay discovery signal resource pool, a sidelink discovery signal resource pool, or a sidelink data communication resource pool.

[0109] The target cell is transmitting the at least part of the system information using a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool if the target cell has a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool configured; and, if a sidelink discovery signal resource pool is not configured in the target cell, transmitting at least some of the system information using a sidelink data communication resource pool.

[0110] 2. Regarding the system information obtained by the far-end terminal via the relay terminal.

[0111] Optionally, when the first operation includes the second sub-operation, the system information that the far-end terminal obtains through the relay terminal is: i) valid system information stored in the relay terminal; ii) first system information that the relay terminal requests from the target cell based on the system information request of the far-end terminal; iii) second system information that the far-end terminal requests from the target cell via the relay terminal, but is not limited to this.

[0112] In i), the valid system information may be understood as system information that has been updated to the latest version.

[0113] In ii), the first system information is transmitted non-transparently by a relay terminal, and after receiving a request for the first system information transmitted by the relay terminal, the target cell can transmit the first system information to a far-end terminal via a first interface, and the far-end terminal can receive the first system information via the first interface.

[0114] In iii), the first system information is transparently transmitted by a relay terminal. After receiving a request for the second system information forwarded by the relay terminal, the target cell can transmit the second system information to a far-end terminal by the target cell, and the far-end terminal can receive the second system information forwarded by the relay terminal.

[0115] The main differences between ii) and iii) are as follows: in ii), the far-end terminal knows the request content of the relay terminal, but in iii), the far-end terminal does not know the request content of the relay terminal; in ii), the first system information is transmitted directly between the target cell and the far-end terminal and does not need to be transferred by other devices; but in iii), the second system information is transferred by the relay terminal.

[0116] Alternatively, the valid system information in i) or the second system information in iii) may be carried by either a sidelink radio resource control (RRC) message sent by the relay terminal or a sidelink RRC container sent by the relay terminal.

[0117] That is, the relay terminal may transmit the valid system information or the second system information by a sidelink RRC message or a sidelink RRC message container. Of course, in other embodiments, the relay terminal may broadcast or groupcast the valid system information or the second system information.

[0118] Optionally, the far-end terminal performing a first operation when the system information includes the first system information: a far-end terminal sending a first request to the relay terminal to request first system information; The method may further include receiving the first system information by the far-end terminal via the first interface.

[0119] When specifically implemented, after receiving the first request, the relay terminal may send the first request to the target cell, so that the target cell sends the first system information to the far-end terminal via a first interface.

[0120] Optionally, the first system information is broadcast by the target cell or transmitted by the target cell via an RRC connection between the target cell and the far-end terminal, that is, the target cell may transmit the first system information to the far-end terminal or may broadcast the first system information via an RRC connection.

[0121] Optionally, the far-end terminal performing a first operation when the system information includes the second system information: a far-end terminal transmitting a second request to the target cell by the relay terminal to request second system information; and the far-end terminal receiving the second system information by the relay terminal.

[0122] When specifically implemented, after receiving the second request, the relay terminal may forward the second request to the target cell, and after receiving the second request, the target cell may send the second system information to the relay terminal, so that the relay terminal forwards the second system information to the far-end terminal.

[0123] In an embodiment of the present application, the specific information included in the minimum system information set may be predetermined, for example, stipulated by a protocol or configured by a network side device. Optionally, the minimum system information set may include: At least some of the information in the MIB; At least some of the information in SIB1; At least some information in System Information Block 12 SIB12; configuration information of a sidelink resource pool, including at least one of a sidelink data transmission resource pool, a sidelink relay discovery signal resource pool, and a sidelink discovery signal resource pool; and a system information block SIB relating to said configuration information; and Reference Signal Received Power (RSRP) threshold information of the far-end terminal, but is not limited thereto.

[0124] In an embodiment of the present application, optionally, the system information may include at least one of system information corresponding to N broadcast groups and system information corresponding to M groupcast groups, where N and M are both positive integers.

[0125] In a specific implementation, the system information corresponding to a broadcast group may be understood as the system information defined or configured in the broadcast group. The system information corresponding to a groupcast group is similar to this and will not be further described.

[0126] In this alternative embodiment, system information may be defined or organized into at least one broadcast group and / or at least one groupcast group. System information corresponding to a broadcast group may be transmitted by broadcast, and system information corresponding to a groupcast group may be transmitted by groupcast, thereby standardizing the transmission of system information.

[0127] Alternatively, the minimum system information set may be defined as one broadcast group, and other system information may be defined as at least one broadcast group, or the minimum system information set may be defined as one broadcast group, and other system information may be defined as at least one groupcast group. In specific implementation, when defining a groupcast group, system information corresponding to the groupcast group may be defined according to the needs of the terminal.

[0128] In an embodiment of the present application, optionally, when the system information includes updated system information, the far-end terminal performs the first operation: When the updated system information is broadcast by the relay terminal, a far-end terminal receives the updated system information by the relay terminal; if the updated system information is transmitted by the relay terminal via a dedicated sidelink RRC message, the far-end terminal receives the system information carried by the dedicated sidelink RRC message; The updated system information is broadcast by the target cell, and when the far-end terminal is within a coverage range of the target cell, the far-end terminal receives the updated system information through the first interface; When the relay terminal has not broadcast the updated system information and the far-end terminal is not within the coverage range of the target cell, the far-end terminal may request the updated system information from the target cell via the relay terminal, i.e., the updated system information may be transparently transmitted by the relay terminal.

[0129] As can be seen from this, in the embodiments of the present application, the updated system information may be broadcast, groupcast or unicast to the far-end terminal by the relay terminal, or may be broadcast to the far-end terminal by the target cell, thereby improving the flexibility of transmitting the updated system information.

[0130] Referring to Figure 5, Figure 5 is a flowchart of an information transmission method according to an embodiment of the present application. The information transmission method of Figure 5 is performed by a relay terminal. As shown in Figure 5, the information transmission method may include the following steps:

[0131] In step 501, if a second condition is met, the relay terminal transmits at least a part of the system information to the far-end terminal.

[0132] Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0133] The information transmission method of this embodiment provides a different application scenario in which the relay terminal provides system information to the far-end terminal, thereby improving the effectiveness of the far-end terminal in obtaining system information and further improving the service experience of the far-end terminal.

[0134] Optionally, the second condition is: The system information acquisition priority of the relay terminal is higher than the system information acquisition priority of a first interface, and the first interface is an air interface between the far-end terminal and a cell; the far-end terminal fails to acquire the second portion of the system information through the first interface.

[0135] Optionally, the at least some system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and At least some updated system information; and valid system information stored in the relay terminal; and second system information that the far-end terminal requests from the target cell via the relay terminal.

[0136] Optionally, at least some of the system information that the relay terminal supports forwarding is indicated by first information transmitted by the relay terminal, and the first information is carried in a broadcast message, a groupcast message or dedicated signaling.

[0137] Optionally, the updated at least part of the system information is indicated by at least one of the minimum system information set, a sidelink discovery signal, a sidelink relay discovery signal, a broadcast message of the relay terminal, and a groupcast message of the relay terminal; and Optionally, the valid system information or the second system information is carried by one of a sidelink radio resource control (RRC) message transmitted by the relay terminal or a sidelink RRC container transmitted by the relay terminal.

[0138] Optionally, when the at least part of the system information includes the second system information, the relay terminal transmitting at least part of the system information to the far-end terminal comprises: receiving, by the relay terminal, a second request for requesting second system information sent by the far-end terminal; the relay terminal forwarding the second request to the target cell; receiving, by the relay terminal, the second system information transmitted by the target cell; and the relay terminal transferring the second system information to the far-end terminal.

[0139] Optionally, the at least part of the system information is broadcast or groupcast by the relay terminal.

[0140] Optionally, the broadcast period or groupcast period of the at least part of the system information is an integer multiple of a transmission period of a sidelink relay discovery signal.

[0141] Optionally, the broadcast or groupcast of at least some of the system information includes: the at least some system information is transmitted via a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool; and wherein the at least some system information is transmitted by a sidelink data communication resource pool.

[0142] Optionally, the minimum system information set comprises: At least some of the information in the MIB; At least some of the information in SIB1; At least some information in System Information Block 12 SIB12; configuration information of a sidelink resource pool, including at least one of a sidelink data transmission resource pool, a sidelink relay discovery signal resource pool, and a sidelink discovery signal resource pool; and a system information block SIB relating to said configuration information; and the reference signal received power RSRP threshold information of the far-end terminal.

[0143] Optionally, the at least some system information includes at least one of system information corresponding to N broadcast groups and system information corresponding to M groupcast groups, where N and M are both positive integers.

[0144] It should be noted that this embodiment is an embodiment of a relay terminal corresponding to the embodiment of the method in Fig. 4, so you can refer to the related description in the embodiment of the method in Fig. 4, and can achieve the same beneficial effects. In order to avoid repetitive description, no further description will be given here.

[0145] Referring to Figure 6, Figure 6 is a second flowchart of an information transmission method according to an embodiment of the present application. The information transmission method of Figure 6 is performed by a network side device, and the network side device may be a network side device where a target cell is located. As shown in Figure 6, the information transmission method may include the following steps:

[0146] In step 601, a network side device sends configuration information, which is used to configure behavior information of a relay terminal.

[0147] Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and transmitting a fourth portion of the system information to the far-end terminal after the relay terminal receives the request of the far-end terminal.

[0148] In the information transmission method of this embodiment, the network side equipment can configure the behavior of the relay terminal to send system information to the far-end terminal, thereby improving the effectiveness of the far-end terminal in obtaining system information and further improving the service experience of the far-end terminal.

[0149] Optionally, the relay terminal actively transmitting the third part of the system information to the far-end terminal includes: The relay terminal may also broadcast or groupcast the third part of the system information to the far-end terminals.

[0150] Optionally, the broadcast period or groupcast period of the system information of the third part is an integer multiple of the transmission period of the sidelink relay signal.

[0151] Optionally, the third portion of system information comprises: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, System information broadcast by the target cell; system information that the relay terminal does not transfer; and system information required by the far-end terminal.

[0152] Optionally, the fourth portion of system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and and at least a portion of the updated system information.

[0153] It should be noted that this embodiment is an embodiment of a network-side device corresponding to the embodiment of the method in Fig. 4, so reference can be made to the relevant description in the embodiment of the method in Fig. 4, and the same beneficial effects can be achieved. In order to avoid repetitive description, no further description will be given here.

[0154] The various optional embodiments introduced in the examples of the present application may be realized in combination with each other or may be realized alone, and the examples of the present application are not limited thereto.

[0155] For ease of understanding, an example will be given below.

[0156] In the example below, the first interface is embodied as a Uu interface and the system information is called a system message.

[0157] Examples of the present application may include the following.

[0158] (1) When the far-end UE and the relay UE are in the same cell coverage, at least a minimum set of system messages is read through the Uu interface, and other system messages may be read through the Uu interface and / or by the relay UE. Specifically, A method that stipulates through a protocol that other system messages are read only through the Uu interface or only by the relay UE; A method of indicating which acquisition route is preferred, for example, preferentially reading via the Uu interface or preferentially reading via the relay UE, through network configuration; If the far-end UE fails to read and obtain other system messages through the Uu interface, it can try to read them through the relay UE; or if the far-end UE fails to read other system messages through the relay UE, it can try to read them through the Uu interface.

[0159] (2) When the far-end UE and the relay UE are not in the same cell coverage or the far-end UE does not have cell coverage, at least some system messages (e.g., a minimum system message set) are read by the relay UE, and the reading of other system messages is forwarded by the relay UE via transparent or non-transparent transmission.

[0160] (3) The far-end UE determines whether to request and / or read other system messages except the minimum system message set by the relay UE based on the instructions in the minimum system message set.

[0161] (4) When the far-end UE and the relay UE are not in the same cell coverage range, it decides to read the system message via the Uu interface or the relay UE based on whether a PC5 connection has already been established between it and the relay UE.

[0162] (5) Regarding the broadcast groupcast configuration of system messages, The definition of "minimum system message set" may include, in addition to MIB+SIB1, SIB12 and / or SIBX related to discovery configuration (here, SIBX may be the same as SIB12 or may be a newly introduced SIB).

[0163] Example 1: Reading system messages when relay UE and far-end UE are in the same cell coverage.

[0164] At this time, the far-end UE preferentially reads all or part of the system messages through the Uu interface.

[0165] The far-end UE has priority to read some system messages on the Uu interface. a) The far-end UE preferentially reads MIB and SIB1 messages via the Uu interface; b) the far-end UE preferentially reads other messages broadcast by the target cell via the Uu interface; c) if the target cell does not broadcast system messages related to sidelink or sidelink relay but provides system message transmission related to sidelink or sidelink relay upon request, the far-end UE preferentially requests and receives system messages related to sidelink or sidelink relay over the Uu interface; d) The situation includes at least one of the following: no PC5 connection is established between the far-end UE and the relay UE, and some or all of the system messages are preferentially obtained via the Uu interface.

[0166] Some system information that can be read by the far-end UE is: i. Some system messages other than the minimum message set, ii. The target cell does not broadcast this part of the system information; and iii. Indicating that the relay UE supports the transfer of this part of system information in a broadcast / groupcast message or dedicated signaling; iv. instructing the target cell to provide this partial system message in a SIB1 received by the far-end UE on the Uu interface; v. instructing the target cell to provide this partial system message in the SIB1 received by the far-end UE and forwarded by the relay UE; vi. After the far-end UE and the relay UE establish a sidelink relay, the system message is updated, and the far-end UE reads the modified system message from the relay UE; and vii. When sidelink relaying is not established, the minimum system message set indicates that the system messages have been updated, and when sidelink relaying is established, the relay UE indicates.

[0167] The above system messages read by the relay UE are: 1. The relay UE stores an enabled system message and sends it to the far-end UE through a PC5-RRC message or a PC5-RRC message container; 2. After the relay UE receives the target system message request from the far-end UE via PC5-RRC signaling, the relay UE initiates a request for the target system message from the target cell; and after the relay UE receives the target system message from the target cell, the relay UE sends the target system message to the far-end UE by a PC5-RRC message or a PC5-RRC message container; 3. The relay UE forwards the received target system message request from the far-end UE to the target cell, and the target cell sends the target system message to the far-end UE via an RRC connection between the target cell and the far-end UE, or the target cell broadcasts the target system message on the Uu interface, and the far-end UE reads it on the Uu interface. Optionally, when the far-end UE sends the system message request to the target cell through the relay UE, it may indicate whether it is within the coverage range of the target cell.

[0168] In one implementation, the relay UE not only transmits or broadcasts the minimum set of system messages to the far-end UE, but also the far-end UE should obtain other system messages according to the above 3.

[0169] The above minimum system message set is All or part of the information in the MIB, All or part of the information in SIB1; a sidelink resource pool configuration including at least one of a sidelink data transmission resource pool configuration, a sidelink relay discovery signal resource pool, and one or more associated configurations of a sidelink discovery signal resource pool; It includes at least one of the system information such as the RSRP threshold configuration for the far-end UE.

[0170] Example 2: Reading system messages when the far-end UE and the relay UE are not in the same cell coverage or do not have cell coverage.

[0171] At this time, the far-end UE may follow one of the following two processing methods:

[0172] 1. The far-end UE first searches for the cell where the relay UE is located (i.e., the target cell), and if the far-end UE and the relay UE are within the same cell coverage, the far-end UE may obtain the system message according to the method in embodiment 1.

[0173] 2. The far-end UE may directly obtain the system messages including the minimum system message set and other system messages from the relay UE.

[0174] For example, in Example 2, the relay UE may broadcast / groupcast at least some system messages, for example, a minimum system message set, and other system messages may be acquired based on the description of some system messages in Example 1.

[0175] The broadcast / groupcast period of the at least some system message sets may be an integer multiple of the relay discovery signal period, and in particular may be the same as the relay discovery signal period and an offset.

[0176] The broadcast / groupcast of at least a portion of the system message set may be predefined to be transmitted using a relay discovery signal resource pool or a sidelink data communication resource pool, or may be configured by the target base station to the relay UE.

[0177] If a relay discovery signal resource pool is configured in the base station, transmitting the at least some of the system message sets using the relay discovery signal resource pool; If the base station is not configured with a relay discovery signal resource pool, the base station transmits the at least some of the system message sets using a sidelink data communication resource pool.

[0178] In response, the far-end UE should receive the at least part of the system message set in the corresponding resource pool.

[0179] Example 3: Broadcast groupcast transmission of system messages.

[0180] In this embodiment, the following broadcast / groupcast are defined, and all system messages can be defined / configured as one broadcast / groupcast group and identified by the target L2 identity (ID), or system messages can be divided and configured as multiple broadcast / groupcast groups. The following is an example of grouping system messages for broadcast / groupcast:

[0181] Example 1: Define a minimum set of system messages as one broadcast group, and define other system messages as one or more broadcast groups; Example 2: Combined broadcast and groupcast transmission, where broadcast transmission is configured for a minimum system message set, but groupcast transmission may be configured for other system messages depending on the type of target UE.

[0182] Example 4: System message transmission / forwarding by relay UE.

[0183] In one possible implementation, the relay UE broadcasts some system messages, and other system messages are sent on demand. The periodic broadcasting of system messages is shown in the relevant part of Example 2.

[0184] The target of the system message it broadcasts is all far-end UEs. When a change occurs in the system message, the relay UE sends a broadcast message to the far-end UE to notify the change of the related system message. It has the following receiving methods:

[0185] When the modified system message is broadcast by the relay UE, the far-end UE may receive it by itself; The modified system message is broadcast by the target cell, and when the far-end UE is within the coverage range of the target cell, the far-end UE may receive the system message sent by the Uu interface by itself; If the relay UE is not broadcasting and the far-end UE has no cell coverage or is within the coverage range of a different cell than the relay UE, the far-end UE requests and receives this system message from the relay UE.

[0186] According to the embodiment of the present application, the far-end UE can obtain the system message of the target cell, and assist in establishing a wireless backhaul link, thereby improving the service experience of the far-end UE.

[0187] It should be noted that the execution body of the information acquisition method according to the embodiment of the present application may be an information acquisition device or a control module for executing the information acquisition method in the information acquisition device. In the embodiment of the present application, the information acquisition device according to the embodiment of the present application will be described taking the information acquisition device executing the information acquisition method as an example.

[0188] Please refer to FIG. 7, which is a structural diagram of an information acquisition device according to an embodiment of the present application.

[0189] As shown in FIG. 7, the information acquisition device 700 a first execution module 701 for executing a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0190] Optionally, when the first operation includes at least a first sub-operation, the system information of a first portion of the system information is acquired by the first interface, and the system information of a second portion of the system information is acquired by at least one of the first interface and the relay terminal.

[0191] Optionally, obtaining the second portion of system information comprises: The far-end terminal acquires the second part of the system information through the first interface or the relay terminal; the far-end terminal acquires the second part of the system information through at least one of the first interface and the relay terminal in descending order of priority for acquiring the system information of the first interface and the relay terminal; When the far-end terminal fails to acquire the second part of the system information through the first interface, acquiring the second part of the system information through the relay terminal; and if the far-end terminal fails to acquire the second part of the system information through the relay terminal, the far-end terminal acquires the second part of the system information through the first interface.

[0192] Optionally, the first portion of system information comprises: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, System information broadcast by the target cell; system information that the relay terminal does not transfer; and system information required by the far-end terminal.

[0193] Optionally, the second portion of system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and and at least a portion of the updated system information.

[0194] Optionally, the updated at least part of the system information is indicated by at least one of the minimum system information set, a sidelink discovery signal, a sidelink relay discovery signal, a broadcast message of the relay terminal, and a groupcast message of the relay terminal.

[0195] Optionally, when the first operation is determined based on whether the far end terminal has searched for a target cell, the first operation is When a first condition is satisfied, the first operation includes at least the first sub-operation; and if a first condition is not satisfied, the first operation is the second sub-operation; Here, the first condition includes that the far-end terminal searches for the target cell and that the far-end terminal is within the coverage of the target cell.

[0196] Optionally, when the first operation is the second sub-operation, at least a part of the system information is broadcast or groupcast by the relay terminal.

[0197] Optionally, the broadcast period or groupcast period of the at least part of the system information is an integer multiple of a transmission period of a sidelink relay discovery signal.

[0198] Optionally, the broadcast or groupcast of at least some of the system information includes: the at least some system information is transmitted via a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool; and wherein the at least some system information is transmitted by a sidelink data communication resource pool.

[0199] Optionally, when the first operation includes the second sub-operation, the system information that the far-end terminal obtains through the relay terminal is: valid system information stored in the relay terminal; First system information that the relay terminal requests from the target cell based on the system information request of the far-end terminal; and second system information that the far-end terminal requests from the target cell via the relay terminal.

[0200] Optionally, the valid system information or the second system information is carried by one of a sidelink radio resource control (RRC) message transmitted by the relay terminal or a sidelink RRC container transmitted by the relay terminal.

[0201] Optionally, when the system information includes the first system information, the first execution module 701 specifically: Sending a first request to the relay terminal to request first system information; It is used to receive the first system information via the first interface.

[0202] Optionally, the first system information is broadcast by the target cell or transmitted by the target cell via an RRC connection between the target cell and the far-end terminal.

[0203] Optionally, when the system information includes the second system information, the first execution module 701 specifically: sending, by the relay terminal, a second request to the target cell for requesting second system information; It is used by the relay terminal to receive the second system information.

[0204] Optionally, the minimum system information set comprises: At least some of the information in the MIB; At least some of the information in SIB1; At least some information in System Information Block 12 SIB12; configuration information of a sidelink resource pool, including at least one of a sidelink data transmission resource pool, a sidelink relay discovery signal resource pool, and a sidelink discovery signal resource pool; and a system information block SIB relating to said configuration information; and the reference signal received power RSRP threshold information of the far-end terminal.

[0205] Optionally, the system information includes at least one of system information corresponding to N broadcast groups and system information corresponding to M groupcast groups, where N and M are both positive integers.

[0206] Optionally, when the system information includes updated system information, the first execution module specifically: When the updated system information is broadcast by the relay terminal, receiving the updated system information by the relay terminal; if the updated system information is transmitted by the relay terminal via a dedicated sidelink RRC message, the far-end terminal receives the system information carried by the dedicated sidelink RRC message; receiving the updated system information via the first interface when the updated system information is broadcast by the target cell and a far-end terminal is within a coverage range of the target cell; and when the relay terminal has not broadcast the updated system information and the far-end terminal is not within the coverage range of the target cell, the relay terminal requests the updated system information from the target cell.

[0207] The information acquisition device in the embodiments of the present application may be a device, a device having an operating system, or an electronic device, or may be a component, integrated circuit, or chip in a terminal. The device or electronic device may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include, but is not limited to, the types of terminals listed above. The non-mobile terminal may be, for example, a server, a network-attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, a self-service machine, etc., and the embodiments of the present application are not specifically limited thereto.

[0208] The information acquisition device 700 according to the embodiment of the present application can implement each process implemented by the embodiment of the method of Figure 4 and achieve the same technical effect, and will not be further described here to avoid repetition of description.

[0209] It should be noted that the execution body of the information transmission method according to the embodiment of the present application may be an information transmission device or a control module for executing the information transmission method in the information transmission device. In the embodiment of the present application, the information transmission device according to the embodiment of the present application will be described by taking the information transmission device executing the information transmission method as an example.

[0210] Please refer to FIG. 8, which is a second structural diagram of an information transmitting device according to an embodiment of the present application.

[0211] As shown in FIG. 8, the information transmitting device 800 a second execution module 801 for sending at least some system information to the far-end terminal when a second condition is met; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0212] Optionally, the second condition is: The system information acquisition priority of the relay terminal is higher than the system information acquisition priority of a first interface, and the first interface is an air interface between the far-end terminal and a cell; the far-end terminal fails to acquire the second portion of the system information through the first interface.

[0213] Optionally, the at least some system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and At least some updated system information; and valid system information stored in the relay terminal; and second system information that the far-end terminal requests from the target cell via the relay terminal.

[0214] Optionally, at least some of the system information that the relay terminal supports forwarding is indicated by first information transmitted by the relay terminal, and the first information is carried in a broadcast message, a groupcast message or dedicated signaling.

[0215] Optionally, the updated at least part of the system information is indicated by at least one of the minimum system information set, a sidelink discovery signal, a sidelink relay discovery signal, a broadcast message of the relay terminal, and a groupcast message of the relay terminal; and Optionally, the valid system information or the second system information is carried by one of a sidelink radio resource control (RRC) message transmitted by the relay terminal or a sidelink RRC container transmitted by the relay terminal.

[0216] Optionally, when the at least some system information includes the second system information, the second execution module specifically: receiving a second request for requesting second system information sent by the far-end terminal; forwarding the second request to the target cell; receiving the second system information transmitted by the target cell; It is used to transfer the second system information to the far-end terminal.

[0217] Optionally, the at least part of the system information is broadcast or groupcast by the relay terminal.

[0218] Optionally, the broadcast period or groupcast period of the at least part of the system information is an integer multiple of a transmission period of a sidelink relay discovery signal.

[0219] Optionally, the broadcast or groupcast of at least some of the system information includes: the at least some system information is transmitted via a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool; and wherein the at least some system information is transmitted by a sidelink data communication resource pool.

[0220] Optionally, the minimum system information set comprises: At least some of the information in the MIB; At least some of the information in SIB1; At least some information in System Information Block 12 SIB12; configuration information of a sidelink resource pool, including at least one of a sidelink data transmission resource pool, a sidelink relay discovery signal resource pool, and a sidelink discovery signal resource pool; and a system information block SIB relating to said configuration information; and the reference signal received power RSRP threshold information of the far-end terminal.

[0221] Optionally, the at least some system information includes at least one of system information corresponding to N broadcast groups and system information corresponding to M groupcast groups, where N and M are both positive integers.

[0222] The information transmitting device 800 may be a device, a device having an operating system, or an electronic device, or may be a component, integrated circuit, or chip in a terminal. This device or electronic device may be a mobile terminal or a non-mobile terminal. Exemplarily, a mobile terminal may include, but is not limited to, the types of terminals listed above. A non-mobile terminal may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, a self-service machine, etc., and the embodiments of the present application are not specifically limited thereto.

[0223] The information transmission device 800 according to the embodiment of the present application can implement each process implemented by the embodiment of the method of Figure 5 and achieve the same technical effect, and will not be further described here to avoid repetition of description.

[0224] Please refer to FIG. 9, which is a second structural diagram of an information transmitting device according to an embodiment of the present application.

[0225] As shown in FIG. 9, the information transmitting device 900 a third execution module 901 for sending configuration information, the configuration information being used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and transmitting a fourth portion of the system information to the far-end terminal after the relay terminal receives the request of the far-end terminal.

[0226] Optionally, the relay terminal actively transmitting the third part of the system information to the far-end terminal includes: The relay terminal may also broadcast or groupcast the third part of the system information to the far-end terminals.

[0227] Optionally, the broadcast period or groupcast period of the system information of the third part is an integer multiple of the transmission period of the sidelink relay signal.

[0228] Optionally, the third portion of system information comprises: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, System information broadcast by the target cell; system information that the relay terminal does not transfer; and system information required by the far-end terminal.

[0229] Optionally, the fourth portion of system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and and at least a portion of the updated system information.

[0230] The information transmitting device in the embodiments of the present application may be a device, a device with an operating system, or an electronic device, or may be a component, integrated circuit, or chip in the network side device. The network side device may include, but is not limited to, the types of network side devices listed above, and the embodiments of the present application are not specifically limited thereto.

[0231] The information transmission device 900 according to the embodiment of the present application can implement each process implemented by the embodiment of the method of Figure 6 and achieve the same technical effect, and will not be further described here to avoid repetition of description.

[0232] Optionally, as shown in FIG. 10 , an embodiment of the present application further provides a communication device 1000, which includes a processor 1001, a memory 1002, and a program or instruction stored in the memory 1002 and operable on the processor 1001. For example, when the communication device 1000 is a far-end terminal, the program or instruction executed by the processor 1001 can realize the processes of the method embodiment of FIG. 4 and achieve the same technical effect. When the communication device 1000 is a relay terminal, the program or instruction executed by the processor 1001 can realize the processes of the method embodiment of FIG. 5 and achieve the same technical effect. When the communication device 1000 is a network-side device, the program or instruction executed by the processor 1001 can realize the processes of the method embodiment of FIG. 6 and achieve the same technical effect. To avoid repetition, further description will not be provided here.

[0233] An embodiment of the present application further provides a terminal, which includes a processor and a communication interface.

[0234] When the terminal is a far-end terminal, the communication interface is used to perform a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0235] This terminal embodiment corresponds to the method embodiment of FIG. 4, and each implementation process and realization manner of the method embodiment of FIG. 4 can be applied to this terminal embodiment and can achieve the same technical effects.

[0236] When the terminal is a relay terminal, the communication interface used to transmit at least some system information to a far-end terminal when a second condition is met; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0237] This terminal embodiment corresponds to the method embodiment of FIG. 5, and the implementation processes and realization methods of the above method embodiment can all be applied to this terminal embodiment and can achieve the same technical effects.

[0238] Specifically, FIG. 11 is a hardware structural schematic diagram of a terminal implementing an embodiment of the present application.

[0239] The terminal 1100 includes at least some components such as, but not limited to, a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, and a processor 1110.

[0240] As will be understood by those skilled in the art, the terminal 1100 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 1110 by a power management system, thereby realizing functions such as charge / discharge management and power consumption management. The terminal structure shown in Figure 11 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than those shown, or a combination of some components, or a different arrangement of components, which will not be further described here.

[0241] It should be understood that in the embodiment of the present application, the input unit 1104 may include a graphics processing unit (GPU) 11041 and a microphone 11042, and the graphics processor 11041 processes image data of still or video images captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 1106 may include a display panel 11061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. The user input unit 1107 includes a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 may include two parts: a touch detection device and a touch controller. The other input devices 11072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and a control lever, which will not be further described herein.

[0242] In the embodiment of the present application, the radio frequency unit 1101 receives downlink data from the network side device, and then processes the data in the processor 1110, and transmits uplink data to the network side device. Generally, the radio frequency unit 1101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0243] The memory 1109 may be used to store software programs or instructions and various data. The memory 1109 may primarily include a program or instruction storage area and a data storage area, where the program or instruction storage area can store an operating system, an application program or instructions required for at least one function (e.g., audio playback function, image playback function, etc.), etc. The memory 1109 may include high-speed random access memory or nonvolatile memory, where the nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, the memory 1109 may be at least one magnetic disk memory device, flash memory device, or other nonvolatile solid-state memory device.

[0244] The processor 1110 may include one or more processing units. Alternatively, the processor 1110 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, and application programs or instructions, and the modem processor mainly processes wireless communications, such as a baseband processor. As can be appreciated, the modem processor does not have to be integrated into the processor 1110.

[0245] Wherein, if the terminal is a far-end terminal, the radio frequency unit 1101: is used to perform a first operation, the first operation comprising: When the far-end terminal and the relay terminal are in the same cell coverage, the first operation includes at least a first sub-operation; When the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage, the first operation is a second sub-operation, or the first operation is determined based on whether the far-end terminal has searched for a target cell, and the target cell is a serving cell covering the relay terminal; the first operation is determined based on an indication of a minimum system information set; the first operation is determined based on whether a sidelink connection is established between the far-end terminal and the relay terminal; Here, the first sub-operation is to obtain system information through a first interface, which is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information through the relay terminal.

[0246] If the terminal is a relay terminal, the radio frequency unit 1101: used to transmit at least some system information to a far-end terminal when a second condition is met; Here, the second condition is: The far-end terminal and the relay terminal are in the same cell coverage, and the far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; and a sidelink connection is established between the relay terminal and the far-end terminal.

[0247] It should be noted that in this embodiment, the terminal 1100 can implement each process in the method embodiment of Figure 4 or Figure 5 in the embodiment of the present application and achieve the same beneficial effects, and in order to avoid repetition of the description, it will not be further described here.

[0248] An embodiment of the present application further provides a network side device, which includes a processor and a communication interface.

[0249] Here, the communication interface is used to transmit configuration information, the configuration information being used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and transmitting a fourth portion of the system information to the far-end terminal after the relay terminal receives the request of the far-end terminal.

[0250] This embodiment of the network-side equipment corresponds to the above-mentioned embodiment of the network-side equipment method, and the implementation processes and realization methods of the above-mentioned embodiment of the method can all be applied to this embodiment of the network-side equipment, and the same technical effects can be achieved.

[0251] Specifically, an embodiment of the present application further provides a network side device. As shown in Fig. 12, the network side device 1200 includes an antenna 121, a radio frequency device 122, and a baseband device 123. The antenna 121 and the radio frequency device 122 are connected to each other. In the uplink direction, the radio frequency device 122 receives information through the antenna 121 and transmits the received information to the baseband device 123 for processing. In the downlink direction, the baseband device 123 processes the information to be transmitted and transmits it to the radio frequency device 122, and the radio frequency device 122 processes the received information and then transmits it through the antenna 121.

[0252] The above frequency band processing device may be located in a baseband device 123, and the method performed by the network side equipment in the above embodiments may be implemented in the baseband device 123, which includes a processor 124 and a memory 125.

[0253] The baseband device 123 may include, for example, at least one baseband board, on which multiple chips are installed, and as shown in FIG. 12, one of the chips is, for example, a processor 124, which is connected to a memory 125, and calls the program in the memory 125 to perform the network equipment operations shown in the above method embodiments.

[0254] The baseband unit 123 may further include a network interface 126 for communicating with the radio frequency unit 122, which may be, for example, a common public radio interface (CPRI).

[0255] Specifically, the network side device of the embodiment of the present application further includes instructions or programs stored in memory 125 and capable of running on processor 124, and processor 124 can call the instructions or programs in memory 125 to perform each process in the method embodiment of FIG. 6 or the method performed by each module shown in FIG. 9, and achieve the same technical effect, which will not be further described here to avoid repetition.

[0256] The embodiments of the present application further provide a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it can realize each process of the embodiments of the information acquisition or information transmission method and achieve the same technical effects. In order to avoid repetition, no further description will be given here. Here, the computer-readable storage medium includes, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0257] The embodiments of the present application further provide a readable storage medium, which may be non-volatile or volatile, and stores a program or instruction on the readable storage medium, which, when executed by a processor, can realize each process of the method embodiments of Figure 4, Figure 5 or Figure 6 and achieve the same technical effects. In order to avoid repetition, no further description will be given here.

[0258] The processor may be the processor in the terminal described in the above embodiment. The readable storage medium may include a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0259] The embodiments of the present application further provide a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor running a program or instruction to implement each process of the method embodiments of Figure 4, Figure 5 or Figure 6, and can achieve the same technical effects. In order to avoid repetition, no further description will be given here.

[0260] It should be understood that the chips referred to in the embodiments of this application may be referred to as system level chips, system chips, chip systems, or system-on-chips.

[0261] An embodiment of the present application further provides a computer program product, wherein the computer program product is stored in a non-transitory readable storage medium, and the computer program product can be executed by at least one processor to realize each process in the method embodiments of Figure 4, Figure 5 or Figure 6 above, and achieve the same technical effects, which will not be further described here to avoid repetition.

[0262] It should be noted that, in this specification, the terms "comprise," "include," "includes," or any other variant thereof are intended to cover the non-exclusive "comprise," whereby a process, method, article, or apparatus comprising a set of elements not only includes those elements, but also other elements not expressly listed or inherent in such process, method, article, or apparatus. Absent further limitations, an element defined by the phrase "comprises one of" does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising that element. It should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions in an essentially simultaneous manner or in the reverse order based on the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

[0263] As will be apparent to those skilled in the art from the above description of the embodiments, the methods of the above embodiments can be realized in the form of software and a necessary general-purpose hardware platform. Of course, they can also be realized in hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical proposal of the present application, in substance or in part contributing to the prior art, may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes a number of instructions for causing a terminal (which may be a mobile phone, computer, server, air conditioner, network device, etc.) to execute the methods described in each embodiment of the present application.

[0264] Although the embodiments of the present application have been described above with reference to the accompanying drawings, the present application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not limiting. Those skilled in the art can take inspiration from the teachings of the present application and implement many variations without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present application.

Claims

1. An information acquisition method, comprising: the far-end terminal performing a first operation; The far end terminal determines, based on whether it has searched for a target cell, that the first operation includes at least a first sub-operation or that the first operation is a second sub-operation; Wherein, the target cell is a serving cell covering a relay terminal, the first sub-operation is to acquire system information through a first interface, the first interface is an air interface between the far-end terminal and a cell, and the second sub-operation is to acquire system information by the relay terminal; The far-end terminal performing the second sub-operation comprises: An information acquisition method, comprising: if the far-end terminal has not searched for the target cell, or if the far-end terminal has searched for the target cell but is not within the coverage of the target cell, the far-end terminal acquires all system information through the relay terminal.

2. 2. The method of claim 1, wherein, when the first operation includes at least a first sub-operation, the system information of a first portion of the system information is acquired by the first interface, and the system information of a second portion of the system information is acquired by at least one of the first interface and the relay terminal.

3. The second part of the system information is obtained by: The far-end terminal acquires the second part of the system information through the first interface or the relay terminal; the far-end terminal acquires the second part of the system information through at least one of the first interface and the relay terminal in descending order of priority for acquiring the system information of the first interface and the relay terminal; When the far-end terminal fails to acquire the second part of the system information through the first interface, acquiring the second part of the system information through the relay terminal; and if the far-end terminal fails to acquire the second part of the system information by the relay terminal, acquiring the second part of the system information by the first interface.

4. The first portion of system information comprises: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, System information broadcast by the target cell; system information that the relay terminal does not transfer; and system information required by the far-end terminal.

5. The second portion of system information comprises: A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and and at least one of updated system information; 3. The method of claim 2, wherein the updated at least some system information is indicated by at least one of the minimum system information set, a sidelink discovery signal, a sidelink relay discovery signal, a broadcast message of the relay terminal, and a groupcast message of the relay terminal.

6. When a first condition is satisfied, the first operation includes at least the first sub-operation, and when a first condition is not satisfied, the first operation is the second sub-operation; 2. The method of claim 1, wherein the first condition includes that the far-end terminal searches for the target cell and that the far-end terminal is within the coverage of the target cell.

7. When the first operation is the second sub-operation, at least a part of the system information is broadcast or group-cast by the relay terminal; a broadcast period or a groupcast period of the at least part of the system information is an integer multiple of a transmission period of a sidelink relay discovery signal; and / or The broadcast or groupcast of at least some of the system information includes: the at least some system information is transmitted via a sidelink relay discovery signal resource pool or a sidelink discovery signal resource pool; and wherein the at least some system information is transmitted by a sidelink data communication resource pool.

8. When the first operation includes the second sub-operation, the system information that the far-end terminal obtains through the relay terminal is: valid system information stored in the relay terminal; First system information that the relay terminal requests from the target cell based on the system information request of the far-end terminal; and second system information requested by the far-end terminal from the target cell by the relay terminal.

9. The far-end terminal performs a first operation when the system information includes the first system information, a far-end terminal sending a first request to the relay terminal to request first system information; the far-end terminal receiving the first system information via the first interface, the first system information being broadcast by the target cell or transmitted by the target cell via an RRC connection between the target cell and the far-end terminal; Or, The far-end terminal performs a first operation when the system information includes the second system information, a far-end terminal transmitting a second request to the target cell by the relay terminal to request second system information; and receiving the second system information by the relay terminal at the far-end terminal.

10. If the first operation is the first sub-operation, The far-end terminal and the relay terminal are within the same cell coverage; and a side link connection is not established between the far-end terminal and the relay terminal. If the first operation is the second sub-operation, The far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; The method of claim 1 , further satisfying at least one of the following: a sidelink connection is established between the far-end terminal and the relay terminal.

11. An information transmission method applied to a communication system including a relay terminal and a far-end terminal, and when a second condition is satisfied, the relay terminal transmits at least a part of system information to the far-end terminal; Here, the second condition is: the far-end terminal and the relay terminal are in the same cell coverage; The far-end terminal and the relay terminal are not in the same cell coverage or the far-end terminal does not have cell coverage; a minimum system information set indicating that the far-end terminal acquires system information through the relay terminal; a side link connection is established between the relay terminal and the far-end terminal; determining, based on whether the far-end terminal performs a first operation and searches for a target cell, whether the first operation includes at least a first sub-operation or the first operation is a second sub-operation, where the target cell is a serving cell covering the relay terminal, the first sub-operation is to obtain system information through a first interface, the first interface is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information by the relay terminal; The far-end terminal performing the second sub-operation comprises: An information transmission method, comprising: if the far-end terminal has not searched for the target cell, or if the far-end terminal has searched for the target cell but is not within the coverage of the target cell, the far-end terminal obtains all system information through the relay terminal.

12. The second condition is: The priority of acquiring system information of the relay terminal is higher than the priority of acquiring system information of the first interface; the far-end terminal fails to acquire a second portion of the system information through the first interface; and / or The at least some system information is A minimum system information set or at least some system information other than the minimum system information set; at least some system information that the target cell is not broadcasting; and At least some system information that the relay terminal supports forwarding; at least some system information provided by the target cell; and At least some updated system information; and valid system information stored in the relay terminal; and second system information requested by the far-end terminal from the target cell by the relay terminal.

13. An information transmission method applied to a communication system including a network side device, a relay terminal, and a far-end terminal, the network side device transmits configuration information, the configuration information being used to configure behavior information of the relay terminal; Here, the behavior information is the relay terminal actively transmitting a third portion of system information to the far-end terminal; and transmitting a fourth part of the system information to the far-end terminal after the relay terminal receives the request of the far-end terminal; determining, based on whether the far-end terminal performs a first operation and searches for a target cell, whether the first operation includes at least a first sub-operation or the first operation is a second sub-operation, where the target cell is a serving cell covering the relay terminal, the first sub-operation is to obtain system information through a first interface, the first interface is an air interface between the far-end terminal and a cell, and the second sub-operation is to obtain system information by the relay terminal; The far-end terminal performing the second sub-operation comprises: An information transmission method, comprising: if the far-end terminal has not searched for the target cell, or if the far-end terminal has searched for the target cell but is not within the coverage of the target cell, the far-end terminal obtains all system information through the relay terminal.

14. The relay terminal actively transmits the third part of the system information to the far-end terminal, the relay terminal actively broadcasting or groupcasting a third part of the system information to the far-end terminal; a broadcast period or groupcast period of the third part of the system information is an integer multiple of a transmission period of a sidelink relay signal; the third portion of system information: a minimum system information set; Master Information Block MIB and System Information Block 1 SIB1, system information broadcast by the target cell; and system information that the relay terminal does not transfer; and system information required by the far-end terminal.

15. A terminal including a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions implementing the steps of the information acquisition method according to any one of claims 1 to 10 when executed by the processor.

16. A communication system comprising a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions implementing the steps of the information transmission method according to claim 11 or 12 when executed by the processor.

17. A communications system comprising a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the information transmission method according to claim 13 or 14.

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