System information request method and device, terminal and storage medium

Abstract

The embodiment of the present application discloses a system information request method and device, a terminal and a storage medium; the method comprises: the terminal monitors whether at least one relay device broadcasts the required target system information within a first time period; if the target system information is not monitored within the first time period, the terminal sends a first information to a target relay device in at least one relay device, the first information is used to request the target relay device to forward the target system information; the target relay device obtains the first information from the terminal. It can be seen that the embodiment of the present application considers avoiding sending and receiving unnecessary system information requests by first monitoring and then requesting before the terminal needs to request the target relay device in at least one relay device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a system information request method and device, a terminal and a storage medium. Background Art

[0002] The service and system aspects (SA) group of the 3rd Generation Partnership Project (3GPP) started research on Proximity-based Services (ProSe) communications in Release 12.

[0003] Since there are coverage blind spots in actual network deployment, terminals in the coverage blind spots cannot communicate with network devices. Therefore, the SA group of 3GPP introduced the communication architecture of relay devices (UE-to-network relay) when studying Prose communication, and forwarded data services through relay devices to improve network coverage and solve the problem of coverage blind spots.

[0004] At present, the standard protocols specified by 3GPP support relay devices to forward system information (SI) to terminals connected to them through broadcast, multicast or proprietary signaling. However, with the continuous evolution and subdivision of communication scenarios, the content of the standard protocols specified by 3GPP regarding the terminal requesting the relay device to forward the system information it needs needs further study. Summary of the invention

[0005] The embodiments of the present application provide a system information request method and device, a terminal and a storage medium, so as to avoid sending and receiving unnecessary system information requests by first listening and then requesting before the terminal needs to request the relay device to forward the required system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0006] In a first aspect, an embodiment of the present application provides a system information request method, including:

[0007] The terminal monitors whether at least one relay device broadcasts the required target system information within a first time period;

[0008] In a case where the target system information is not monitored within the first time period, the terminal sends first information to a target relay device among the at least one relay device, where the first information is used to request the target relay device to forward the target system information.

[0009] In a second aspect, an embodiment of the present application provides a system information request method, including:

[0010] The target relay device obtains first information from the terminal, the first information is used to request the target relay device to forward the target system information required by the terminal, and the first information is sent by the terminal to the target relay device in the at least one relay device when the terminal does not listen to at least one relay device broadcasting the target system information within a first time period. In a third aspect, an embodiment of the present application provides a system information request device, the device comprising a processing unit and a communication unit, the processing unit being used to:

[0011] monitoring whether at least one relay device broadcasts required target system information within a first time period;

[0012] When the target system information is not monitored within the first time period, first information is sent to a target relay device in the at least one relay device through the communication unit, where the first information is used to request the target relay device to forward the target system information.

[0013] In a fourth aspect, an embodiment of the present application provides a system information request device, the device comprising a processing unit and a communication unit, the processing unit being configured to:

[0014] The communication unit obtains first information from the terminal, the first information being used to request forwarding of target system information required by the terminal, and the first information being sent by the terminal because it does not monitor at least one relay device broadcasting the target system information within a first time period. In a fifth aspect, an embodiment of the present application provides a terminal, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the one or more programs include instructions for executing the steps in the first aspect of the embodiment of the present application.

[0015] In the sixth aspect, an embodiment of the present application provides a relay device, which is a target relay device, and the target relay device includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the processor, and the one or more programs include instructions for executing the steps in the second aspect of the embodiment of the present application.

[0016] In the seventh aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps described in the first aspect or the second aspect of the embodiment of the present application.

[0017] In an eighth aspect, an embodiment of the present application provides a computer program, wherein the computer program is operable to cause a computer to execute some or all of the steps described in the first aspect or the second aspect of the embodiment of the present application. The computer program may be a software installation package.

[0018] It can be seen that in an embodiment of the present application, first, the terminal monitors whether at least one relay device broadcasts the required target system information within a first time period. Then, if the target system information is not monitored within the first time period, the terminal sends the first information to the target relay device in at least one relay device. Finally, the target relay device obtains the first information from the terminal. Since the first information is used to request the target relay device to forward the target system information, the present application avoids sending and receiving unnecessary system information requests by first listening and then requesting before the terminal needs to request the target relay device in at least one relay device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the architecture of another wireless communication system provided in an embodiment of the present application;

[0022] Figure 3 It is a flowchart of a system information request method provided in an embodiment of the present application;

[0023] Figure 4 It is a block diagram of the functional units of a system information request device provided in an embodiment of the present application;

[0024] Figure 5 It is a block diagram of functional units of another system information request device provided in an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0026] Figure 7It is a structural diagram of a relay device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. For the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] It should be noted that the "connection" in the embodiments of the present application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and no limitation is made to this. The "network" and "system" in the embodiments of the present application express the same concept, and the communication system is the communication network.

[0029] The technical solutions of the embodiments of the present application can be applied to various wireless communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE-based Access to Unlicensed Spectrum (LTE-U) system, NR-based Access to Unlicensed Spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Network (WLAN) system. Networks, WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), 6th-Generation (6G) systems or other communication systems, etc.

[0030] It should be noted that the number of connections supported by traditional wireless communication systems is limited and easy to implement. However, with the development of communication technology, wireless communication systems can not only support traditional wireless communication systems, but also support device to device (D2D) communication, machine to machine (M2M) communication, machine type communication (MTC), vehicle to vehicle (V2V) communication, vehicle to everything (V2X) communication, narrow band internet of things (NB-IoT) communication, etc. Therefore, the technical solution of the embodiment of the present application can also be applied to the above wireless communication system.

[0031] Optionally, the wireless communication system of the embodiment of the present application can be applied to beamforming (beamforming), carrier aggregation (CA), dual connectivity (DC) or standalone (SA) deployment scenarios, etc.

[0032] Optionally, the wireless communication system of the embodiment of the present application may be applied to an unlicensed spectrum, wherein the unlicensed spectrum may also be considered as a shared spectrum. Alternatively, the wireless communication system of the embodiment may also be applied to an authorized spectrum, wherein the authorized spectrum may also be considered as an unshared spectrum.

[0033] Since the embodiments of the present application describe various embodiments in combination with terminals, relay devices and network devices, the terminals, relay devices and network devices involved will be described in detail below.

[0034] Specifically, the terminal may be a user equipment (UE), a remote terminal (remote UE), a relay UE, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a mobile device, a user terminal, an intelligent terminal, a wireless communication device, a user agent or a user device. It should be noted that a relay device is a terminal that can provide relay forwarding services for other terminals (including remote terminals). In addition, the terminal may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a next-generation communication system (such as an NR communication system) or a terminal in a future-evolved public land mobile communication network (PLMN), etc., without specific limitation.

[0035] Furthermore, the terminal can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can be deployed on the water surface (such as ships); it can also be deployed in the air (such as airplanes, balloons and satellites).

[0036] Furthermore, the terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in unmanned autonomous driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0037] Specifically, the network device may be a device used to communicate with the terminal, which is responsible for wireless resource management, quality of service (QoS) management, data compression and encryption, data transmission and reception, etc. on the air interface side. The network device may be a base station (BS) in a communication system or a device deployed in a radio access network (RAN) to provide wireless communication functions. For example, a base transceiver station (BTS) in a GSM or CDMA communication system, a node B (NB) in a WCDMA communication system, an evolved node B (eNB or eNodeB) in an LTE communication system, a next generation evolved node B (ng-eNB) in an NR communication system, and a next generation node B (gNB) in an NR communication system. In addition, the network equipment can be other equipment in the core network (CN), such as access and mobility management function (AMF), user plan function (UPF), etc.; it can also be an access point (AP) in a wireless local area network (WLAN), a relay station, a communication device in a future evolved PLMN network, or a communication device in an NTN network, etc.

[0038] It should be noted that in some network deployments, the network device can be an independent node to implement all the functions of the above-mentioned base station, which may include a centralized unit (CU) and a distributed unit (DU), such as gNB-CU and gNB-DU, and may also include an active antenna unit (AAU). Among them, the CU can implement some functions of the network device, and the DU can implement some functions of the network device. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, and the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer. In addition, the AAU implements some physical layer processing functions, RF processing, and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this network deployment, high-level signaling (such as RRC layer signaling) can be considered to be sent by the DU, or by the DU and the AAU. It can be understood that the network device may include at least one of the CU, DU, and AAU. In addition, the CU can be classified as a network device in the access network (radio access network, RAN), and the CU can also be classified as a network device in the core network, without specific limitation.

[0039] Furthermore, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earthorbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water.

[0040] Furthermore, the network device can provide services for the cell, and the terminal in the cell can communicate with the network device through transmission resources (such as spectrum resources). The cell may include a macro cell, a small cell, a metro cell, a micro cell, a pico cell, and a femto cell.

[0041] For example, the wireless communication system of the present application embodiment can be found in Figure 1 . The wireless communication system 10 may include a terminal 110, a relay device 120 and a network device 130. Since the terminal 110 (or remote UE) is outside the coverage of the network device 130, the terminal 110 may forward system information, signaling or data, etc. through the relay device 120 (or UE-to-network relay) within the coverage of the network device 130. Among them, the relay device 120 is a terminal capable of providing relay service capabilities, and the relay device 120 may be a relay device (i.e., a target relay device) determined by the terminal 110 through a relay discovery process, or the relay device 120 may be a relay device (i.e., a target relay device) where the terminal 110 resides.

[0042] It should be noted that communication can be established between the relay device 120 and the network device 130 through the Uu interface. When the terminal 110 is in the RRC connection state (RRC_CONNECTED), a communication connection is established between the terminal 110 and the relay device 120 through the PC5 interface, and the cell corresponding to the network device 130 is the service cell of the terminal 110. At this time, the relay device 120 and the network device 130 can adopt the existing communication mechanism between the terminal and the service cell, and the relay device 120 and the terminal 110 can send system information, signaling or data through a direct communication mechanism. For downlink, the relay device 120 can forward the system information, signaling or data sent by the network device 130 to the terminal 110; for uplink, the relay device 120 can forward the signaling or data sent by the terminal 110 to the network device 130 to the network device 130.

[0043] In addition, when the terminal 110 is in the RRC idle state (RRC_IDLE) or the RRC inactive state (RRC_INACTIVE), the terminal 110 resides under the relay device 120. At this time, although there is no communication connection between the terminal 110 and the relay device 120, the terminal 110 can also forward system information or signaling through the relay device 120.

[0044] Optionally, the wireless communication system 10 may further include multiple network devices, and the coverage area of ​​each network device may include a certain number of terminals and / or a certain number of relay devices, which is not specifically limited here.

[0045] Optionally, the wireless communication system 10 may also include other network entities such as a network controller and a mobility management entity, which are not specifically limited here.

[0046] Before introducing in detail the system information request method provided in the embodiment of the present application, the relevant contents involved in the embodiment of the present application are introduced.

[0047] 1. Proximity-based services (ProSe) communications

[0048] The 3rd Generation Partnership Project (3GPP) Service and System Aspects (SA) group started the research on ProSe communication in Release 12. In ProSe communication, terminals can communicate directly with each other through the PC5 interface, which is a direct interface between terminals, and the communication interface between the terminal and the network device is called the Uu interface.

[0049] Since there are coverage blind spots in actual network deployment, terminals in the coverage blind spots cannot communicate with network devices. Therefore, the SA group of 3GPP introduced the communication architecture of relay devices (UE-to-network relay) when studying Prose communication, and improved network coverage by forwarding data services through relay devices to solve the problem of coverage blind spots. The relay device can be within the coverage range of the network device or outside the coverage range.

[0050] For example, see Figure 2 . Since the terminal 210A is outside the coverage of the network device 220, the terminal 210A can access the network through the terminal 220B in the coverage of the network device 220. Among them, the terminal 220B is a relay device (or UE-to-network relay) capable of providing relay service capabilities. In addition, the terminal 210C and the terminal 210D can communicate directly through the PC5 interface, and the terminal 210E and the terminal 210G can communicate through the terminal 210F. Among them, the terminal 220F is a relay device (or UE-to-UE relay) capable of providing relay service capabilities.

[0051] 2. System information (SI) in NR Uu interface

[0052] The NR communication system classifies the system information of the NR Uu interface more clearly based on the LTE communication system, thereby ensuring that the terminal can normally reside in the cell that provides services for it, providing the necessary common channel information for it to access the network and ensuring its mobility in a non-connected state.

[0053] According to the importance of system information content and the different dissemination methods, system information can be divided into a master information block (MIB) and a series of system information blocks (SIBs).

[0054] In order to arrange the utilization of network resources more reasonably, the propagation mode of system messages can be divided into periodic broadcast and on-demand request-based transmission mode. Among them, in the periodic broadcast mode, the network device can always send the SI within the system information time window (SI-window) corresponding to the SI calculated by it. In the on-demand request-based transmission mode, if the terminal does not request to send SI, the network device does not send the SI to the terminal; if the terminal requests to send SI, the network device will send the SI to the terminal at a certain time within the system information time window corresponding to the calculated SI.

[0055] In addition, system information can be divided into MIB and a series of SIBs, and can also be divided into minimum system information (MinimumSI) and other system information (Other SI). Among them, Minimum SI can include MIB and SIB1, which are transmitted through broadcast channel (BCH) and downlink shared channel (DL-SCH) respectively, and their propagation mode is periodic broadcast. Other SIBs are collectively referred to as Other SI, and their propagation mode can be periodic broadcast or based on terminal on-demand request. At the same time, the terminal can only normally reside or access the current cell when it reads the MinimumSI of the current cell. If the network device does not broadcast the complete Minimum SI, the current cell is not allowed to reside.

[0056] For MIB, MIB contains information related to the cell barring status and multiple physical layer parameters required to obtain SIB1 for the current cell. Among them, the transmission period of MIB is fixed at 80ms, and the same information can be repeatedly transmitted within 80ms. If the terminal receives MIB, it stores MIB and performs the following judgment process according to its content: when the terminal is in idle state, inactive state or connected state, if the current cell is barred, it judges whether to allow cell reselection for other cells at the same frequency point according to the intraFreqReselection information; if the current cell allows access, it obtains the time-frequency parameters of the control channel indicating the reception of SIB1, etc.

[0057] For SIB1, SIB1 contains some special system setting information for the current cell, such as the parameters required for initial access, the current cell common configuration, and the scheduling information of each SIB in Other SI. Among them, the scheduling information of each SIB in Other SI includes Other SI scheduling and usage rule parameters, status indication information of whether each SIB is currently transmitting, system information area identifier (ID), and configuration status of SIBs that need to be broadcast on request.

[0058] In addition, the transmission period of SIB1 is 160ms, and the same information can be repeatedly sent within 160ms, while the default repetition period is 20ms. If the terminal receives SIB1, it stores SIB1 and performs the following processes according to its content: storing cell access related information (including plmn-IdentityList, trackingAreaCode and cellIdentity, etc.); applying the common configuration parameters of the serving cell; and checking the validity of each SIB in Other SI. If the terminal has saved a valid version, it uses this version; otherwise, the terminal decides whether to directly read the system information or initiate a request to the network device based on the scheduling information of each SIB in Other SI in SIB1 and the broadcast of the currently required SIBs.

[0059] For Other SI, one Other SI may include one or more SIBs (such as SIB2 / SIB3, etc.). The transmission of each SIB in the Other SI is carried out through dynamic scheduling within a periodic system information time window (SI-window). Among them, SIBs with the same period in Other SI can be sent in the same SI, and each SI corresponds to an SI-window, and the SI-window lengths of different SIs are consistent, but they are not allowed to overlap with each other.

[0060] If the terminal wants to obtain Other SI, it needs to first determine the order value of each SIB according to the scheduling information of each SIB in Other SI in SIB1, and then calculate the SI-window position corresponding to each SIB. The network device can send the corresponding SIB multiple times in one SI-window, and if the terminal fails to obtain it successfully in the SI-window, it can continue to obtain it in the subsequent SI-window corresponding to the SIB.

[0061] The terminal needs to store the MIB, SIB1 or other SIBs obtained from the current resident or serving cell. At the same time, each system information version is valid for a maximum of 3 hours after its validity is confirmed, and will be deleted by the terminal after this time.

[0062] Both MIB and SIB1 are cell-level specific messages, that is, after the terminal accesses or resides in the current cell, it must ensure the correctness and validity of the MIB and SIB1 of the current cell.

[0063] Each SIB in Other SI can be configured as cell-level or regional-level system information. Among them, cell-level system information is only used in a certain cell and becomes invalid after the terminal leaves the cell; regional-level system information is universal in the set SI area, and an SI area can contain one or more cells.

[0064] For a terminal in an idle or inactive state, the terminal can listen to the system information update indication in the designated paging opportunity in each non-continuous reception cycle. For a terminal in a connected state, if a common search space for listening to paging is configured, the terminal will listen to the system information update indication at least once in each system information modification cycle. Among them, the system information modification cycle is configured in the SI, the SI within the modification cycle cannot change, and the SI modification can only start from the start time of the next modification cycle. In other words, when the terminal learns that the SI needs to be updated in the current modification cycle, the terminal listens to the new SI at the start time of the next modification cycle. At the same time, the system information update can be indicated by scheduling and sent repeatedly multiple times within the modification cycle. In addition, the terminal can always apply the old SI configuration before receiving the new SI.

[0065] In summary, currently, the standard protocols specified by 3GPP support relay devices forwarding system information to terminals connected to it (i.e., remote UE) through broadcast, multicast or proprietary signaling. Since a terminal can request a relay device to forward the system information it needs, if all relay devices within the communication range of the terminal in the network forward the system information by broadcast, and some or some of the relay devices within the communication range may broadcast the system information it needs, then the terminal requests the relay device to forward the system information, which will increase unnecessary signaling overhead and cause a waste of system resources.

[0066] In combination with the above description, the present application embodiment provides a flow chart of a system information request method, please refer to Figure 3 , the method comprising:

[0067] S310. The terminal monitors whether at least one relay device broadcasts required target system information within a first time period.

[0068] The communication interface between the terminal and the target relay device may be a PC5 interface.

[0069] It should be noted that, first, the at least one relay device may include all relay devices within the communication range of the terminal, and each relay device in the at least one relay device and the terminal may be in the same cell (i.e., the current cell). Therefore, the terminal can monitor the system information or signaling of the current cell forwarded by each relay device in the at least one relay device through broadcast.

[0070] Secondly, the terminal can forward the required system information or signaling of the current cell through the target relay device in the at least one relay device. It is worth noting that in the embodiment of the present application, a communication connection may be established between the terminal and the target relay device, such as when the terminal is in an RRC connected state, or a communication connection may not be established, such as when the terminal is in an RRC idle state or an RRC inactive state. At the same time, the terminal may also establish a communication connection with the target relay device in the RRC connected state, and then the communication connection between the terminal and the target relay device is disconnected due to switching from the RRC connected state to the RRC idle state or the RRC inactive state.

[0071] Again, the target relay device in the embodiment of the present application can be a relay device determined by the terminal from the at least one relay device through the relay discovery process, such as selecting the relay device with the best signal quality from the at least one relay device, selecting the relay device with the best device status (most power, strong processing capability, strong relay service capability, etc.) from the at least one relay device, etc.; it can be a relay device in the at least one relay device where the terminal resides, such as the terminal resides under a certain relay device in the at least one relay device through cell reselection; it can also be that the terminal establishes a communication connection with one of the at least one relay device in the RRC connected state, and then continues to reside under the relay device due to switching from the RRC connected state to the RRC idle state or the RRC inactive state. At this time, the relay device is called the target relay device.

[0072] Finally, since the propagation mode of system information can be divided into periodic broadcast and on-demand request transmission based on the terminal, the embodiment of the present application considers that the terminal requests the target relay device to forward the target system information it needs. However, since there may be a situation where part or a certain relay device in the at least one relay device within the communication range of the terminal broadcasts the target system information required by the terminal (such as a certain relay device mainly broadcasts the target system information to other terminals, but the terminal can also monitor the target system information), in order to avoid increasing unnecessary signaling overhead and causing waste of system resources, the embodiment of the present application considers that before the terminal requests the target relay device to forward the target system information it needs, it first determines whether the at least one relay device within its communication range broadcasts the target system information by adding a mechanism of monitoring for a period of time (first time period), thereby avoiding sending unnecessary system information requests through this mechanism, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0073] The target system information will be specifically described in the following embodiments of the present application.

[0074] Specifically, the target system information may include other system information except the necessary system information that the target relay device actively forwards to the terminal.

[0075] It should be noted that in the system information design of the NR Uu interface (communication interface between the terminal and the network device, communication interface between the relay device and the network device, etc.), the system information can be divided into minimum system information (MinimumSI) and other system information (Other SI). Among them, Minimum SI can include MIB and SIB1, and its propagation mode is periodic broadcast; Other SI can include one or more SIBs (such as SIB2 / SIB3, etc.). For details, please refer to the description in the above "System Information in NR Uu Interface".

[0076] At present, in the Release 17 stage of 3GPP, the NR communication system also introduced the communication architecture of the relay device (UE-to-network relay). In this communication architecture, in addition to forwarding data services for the terminal (remote UE), the relay device can also forward the system information of the current cell for the terminal, so as to provide the terminal with the necessary common channel information and other network configuration information required to access or reside in the current cell. However, since the embodiment of the present application mainly analyzes the situation where the communication interface between the terminal and the relay device is the PC5 interface, the above-mentioned "NR Uu interface system information design" may not be suitable for the PC5 interface, and thus further research is needed on the system information design of the PC5 interface.

[0077] Based on this, first of all, since the communication interface between the terminal and the target relay device in the embodiment of the present application is a PC5 interface, the target system information that the terminal requests the target relay device to forward mainly includes other system information except the necessary system information (essentialSIBs) that the target relay device actively forwards to the terminal. Among them, the necessary system information can be understood as the system information required for the terminal to normally reside or access the current cell, and its propagation method is periodic broadcast. In other words, the network device will periodically broadcast the necessary system information, which will then be actively forwarded to the terminal by the target relay device, so that the terminal can normally reside or access the current cell.

[0078] Secondly, since the communication interface between the terminal and the target relay device is a PC5 interface, the embodiment of the present application considers that the necessary system information may include a master information block (such as a MIB indicating a system frame number SFN), a system information block type 1 (such as SIB1 indicating a public land mobile network PLMN and cell information), a system information block type 2 (such as SIB2 indicating cell access prohibition information), and direct communication system information block related information. Among them, the direct communication system information block related information may include LTE device to device further enhancements (further enhancements to LTE device to device, FeD2D) system information block related information (such as SIB18 / SIB19). The target system information may include other system information of the current cell except the necessary system information, such as SIB10 / SIB11 / SIB12 / SIB13 / SIB14 / SIB15, etc., and the target system information required by different terminals is also different.

[0079] Finally, the target system information mainly depends on the on-demand request of the terminal, that is, when the terminal needs it, the terminal requests the target relay device to forward it. In addition, the target relay device can use broadcast, multicast or proprietary signaling when forwarding the target system information to the terminal. Among them, the dedicated signaling can be PC5-RRC signaling or signaling newly specified by the standard protocol.

[0080] Specifically, the granularity of the target system information requested by the terminal may be based on system information SI or system information block SIB.

[0081] It is understandable that the target system information granularity requested by the terminal to the target relay device can be based on SI or SIB. That is, the terminal can request the corresponding required SIBs of the current cell, or request the SI containing the corresponding required SIBs of the current cell, thereby facilitating the improvement of the flexibility and efficiency of the network configuration of system information during the system information request process.

[0082] Specifically, each SIB in the target system information may be configured as cell-level or area-level system information.

[0083] It should be noted that the cell-level SIBs are only used in the current cell and become invalid after the terminal leaves the current cell; the area-level SIBs are universal in a set system information area, and a system information area may include one or more cells.

[0084] The following embodiment of the present application will specifically describe the first time period.

[0085] Specifically, the first time period may satisfy one of the following conditions: the first time period is a period of time within a preset time, the first time period is configured by the network, the first time period is pre-configured by the system, the first time period is specified by a standard protocol, the first time period is determined by the timeout duration of a preset timer, and the preset time is configured by the network, specified by a standard protocol, or pre-configured by the system.

[0086] It should be noted that the first time period of the embodiment of the present application can be configured by the network device to the terminal, can be pre-configured by the system, can be specified by the standard protocol specified by 3GPP, can be determined by the timeout duration of the preset timer, or can be a period of time within the preset time. Among them, for the preset timer, it can be understood that when the terminal needs to request the target relay device to forward the target system information, the terminal can first start the preset timer, and before the preset timer times out, listen to whether there is a relay device broadcasting the target system information within its communication range, and the preset timer can be a network configuration or a system pre-configuration. For the preset time, it can be understood that when the terminal needs to request the target relay device to forward the target system information, the terminal can first randomly listen for a period of time t (i.e., the first time period), t∈(0,X], X represents the preset time. It can be seen that the first time period can be configured in a variety of ways, which is conducive to achieving diversity in system configuration during the system information request process.

[0087] S320: When no target system information is monitored within a first time period, the terminal sends first information to a target relay device among at least one relay device.

[0088] The first information may be used to request the target relay device to forward the target system information.

[0089] It should be noted that the embodiment of the present application considers that before the terminal requests the target relay device to forward the target system information it needs, it first monitors for a period of time (i.e., the first time period) to determine whether at least one relay device within its communication range has broadcast the target system information. Then, if the target system information is not monitored within the first time period, the terminal requests the target relay device to forward the target system information, thereby avoiding sending unnecessary system information requests by first monitoring and then requesting before the terminal requests the required system information, which is beneficial to reducing system signaling overhead and improving system resource utilization.

[0090] The following embodiments of the present application will specifically describe the RRC state in which the terminal needs to request the required target system information from the target relay device.

[0091] Specifically, the terminal may be in an RRC idle state (RRC_IDLE), an RRC inactive state (RRC_INACTIVE), or an RRC connected state (RRC_CONNECTED).

[0092] It is understandable that for all RRC states (idle / inactive / connected), the terminal (remote UE) supports on-demand request to send system information. That is, when the terminal needs to request the required target system information from the target relay device, the terminal can be in RRC idle state, RRC inactive state or RRC connected state.

[0093] In addition, it should be noted that, in combination with the above description, it can be seen that the different RRC states of the terminal will result in different communication connection states (i.e., connected or not connected) between it and the target relay device and the determination of the target relay device (i.e., relay discovery process determination, the relay device where the terminal resides, etc.). It can be seen that the terminal that requests system information on demand in the embodiment of the present application can be in all RRC states, which is conducive to improving the flexibility of system configuration during the system information request process.

[0094] Further, if the terminal is in an RRC connected state, the first information may be carried by PC5-RRC signaling; or, the first information may be carried by signaling specified by a standard protocol.

[0095] The signaling specified by the standard protocol may include signaling for interaction between a terminal and a relay device (or between terminals) newly specified by the standard protocol.

[0096] It can be understood that if the terminal in the RRC connection state does not monitor the target system information within the first time period, the terminal can request the target relay device to forward the target system information through PC5-RRC signaling or signaling specified by the standard protocol, thereby facilitating the interaction of signaling between the terminal and the relay device during the system information request process.

[0097] Further, if the terminal is in an RRC idle state or an RRC inactive state, the first information is carried by signaling specified by the standard protocol.

[0098] The signaling specified by the standard protocol may include signaling for interaction between a terminal and a relay device (or between terminals) newly specified by the standard protocol.

[0099] It can be understood that if a terminal in an RRC idle state or an RRC inactive state does not monitor the target system information within the first time period, the terminal can request the target relay device to forward the target system information through the signaling specified by the standard protocol, thereby facilitating the signaling interaction between the terminal and the relay device during the system information request process.

[0100] The following embodiments of the present application further Figure 3 The method shown also includes the steps described.

[0101] In a possible example, after S310, the method further includes: when the target system information is monitored within the first time period, the terminal cancels sending the first information to the target relay device.

[0102] It can be understood that if the terminal monitors the target system information within the first time period, it means that the terminal can receive the target system information without requesting the target relay device to forward the target system information, which is beneficial to avoid sending unnecessary system information requests, reduce system signaling overhead, and improve system resource utilization.

[0103] In a possible example, the target system information is received by the terminal within a system information time window corresponding to the target system information after the terminal sends the first information.

[0104] It should be noted that the transmission of each SIB in the target system information can be carried out through dynamic scheduling within a periodic system information time window (SI-window). Among them, SIBs with the same period in the target system information can be sent in the same SI, and each SI corresponds to a system information time window. In other words, each SIB in the target system information corresponds to a system information time window. At the same time, the lengths of the system information time windows of different SIs are consistent, but overlap is not allowed. If the terminal wants to obtain the target system information, it is necessary to first determine the position of the system information time window corresponding to each SIB in the target system information. The network device can send the SIB required by the terminal multiple times within a system information time window, and if the terminal fails to obtain it successfully within the system information time window, it can continue to obtain it in the subsequent time window corresponding to the SIB, thereby ensuring that the terminal successfully receives the required target system information through the system information time window.

[0105] Specifically, after S320, the method also includes: if the terminal does not receive the target system information within the system information time window corresponding to the target system information after sending the first information, the terminal again monitors whether at least one relay device broadcasts the target system information within the first time period; if the target system information is not monitored within the first time period, the terminal resends the first information to the target relay device.

[0106] It is understandable that if the terminal does not receive the target system information within the system information time window corresponding to the target system information after sending the first information, it is necessary to monitor again for a period of time (i.e., the first time period) to determine whether at least one relay device within its communication range has broadcast the target system information. Then, if the target system information is not monitored within the first time period, the terminal needs to request the target relay device to forward the target system information again, so as to avoid sending unnecessary system information requests by monitoring again and then re-requesting when the terminal failed to request the required system information last time, thereby reducing system signaling overhead and improving system resource utilization.

[0107] Furthermore, after monitoring again within the first time period whether at least one relay device broadcasts the target system information, the method further includes: if the target system information is monitored within the first time period, the terminal cancels resending the first information to the target relay device.

[0108] It can be understood that if the terminal monitors the target system information again within the first time period, it means that the terminal can receive the target system information without having to re-request forwarding the target system information to the target relay device, thereby helping to avoid sending unnecessary system information requests, reduce system signaling overhead, and improve system resource utilization.

[0109] S330: The target relay device obtains first information from the terminal.

[0110] In a possible example, the target system information is sent by the target relay device within a system information time window corresponding to the target system information after the target relay device obtains the first information. It can be seen that the system information time window is used to ensure that the terminal successfully receives the required target system information.

[0111] It can be seen that in an embodiment of the present application, first, the terminal monitors whether at least one relay device broadcasts the required target system information within a first time period. Then, if the target system information is not monitored within the first time period, the terminal sends the first information to the target relay device in at least one relay device. Finally, the target relay device obtains the first information from the terminal. Since the first information is used to request the target relay device to forward the target system information, the present application avoids sending and receiving unnecessary system information requests by first listening and then requesting before the terminal needs to request the target relay device in at least one relay device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0112] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the method side. It is understandable that in order to realize the above functions, the terminal or network device includes a hardware structure and / or software module corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0113] The embodiment of the present application can divide the terminal or network device into functional units according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of a software program module. It should be noted that the division of units in the embodiment of the present application is schematic, which is only a logical function division, and there may be other division methods in actual implementation.

[0114] In the case of an integrated unit, Figure 4 A functional unit block diagram of a system information request device is provided. The system information request device 400 includes: a processing unit 402 and a communication unit 403. The processing unit 402 is used to control and manage the actions of the terminal. For example, the processing unit 402 is used to support the terminal to execute Figure 3 The steps in and other processes of the technical solution described in this application. The communication unit 403 is used to support communication between the terminal and other devices in the wireless communication system. The system information request device 400 may also include a storage unit 401, which is used to store the program code executed by the system information request device 400 and the transmitted data.

[0115] It should be noted that the system information requesting device 400 may be a chip or a chip module.

[0116] Among them, the processing unit 402 can be a processor or a controller, for example, it can be a central processing unit (CPU), a general processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic boxes, modules and circuits described in combination with the contents disclosed in this application. The processing unit 402 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, and so on. The communication unit 403 can be a communication interface, a transceiver, a transceiver circuit, etc., and the storage unit 401 can be a memory. When the processing unit 402 is a processor, the communication unit 403 is a communication interface, and the storage unit 401 is a memory, the system information request device 400 involved in the embodiment of the present application can be Figure 5 Terminal shown.

[0117] In specific implementation, the processing unit 402 is used to execute any step executed by the terminal in the above method embodiment, and when performing data transmission such as sending, the communication unit 403 can be selectively called to complete the corresponding operation.

[0118] The processing unit 402 is used to: monitor whether at least one relay device broadcasts the required target system information within a first time period; if no target system information is monitored within the first time period, send first information to a target relay device in at least one relay device, and the first information is used to request the target relay device to forward the target system information.

[0119] It should be noted that Figure 4 The specific implementation of each operation in the embodiment can be seen in detail above Figure 3 The description in the method embodiment shown will not be repeated in detail here.

[0120] It can be seen that in the embodiment of the present application, first, the system information request device monitors whether at least one relay device broadcasts the required target system information within a first time period. Then, if the target system information is not monitored within the first time period, the system information request device sends the first information to the target relay device in at least one relay device. Finally, since the first information is used to request the target relay device to forward the target system information, the present application avoids sending unnecessary system information requests by first monitoring and then requesting before the system information request device needs to request the target relay device in at least one relay device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0121] In a possible example, the target system information includes other system information except the necessary system information that the target relay device actively forwards to the terminal.

[0122] In a possible example, the necessary system information includes at least one of the following: a master information block, a system information block type 1, a system information block type 2, and direct communication system information block related information.

[0123] In a possible example, the granularity of the target system information requested by the system information requesting device is based on system information SI or system information block SIB.

[0124] In one possible example, the first time period satisfies one of the following: the first time period is a period of time within a preset time, the first time period is configured by the network, the first time period is pre-configured by the system, the first time period is specified by a standard protocol, the first time period is determined by the timeout duration of a preset timer, and the preset time is configured by the network, specified by a standard protocol, or pre-configured by the system.

[0125] In a possible example, the system information requesting device is in a radio resource control RRC idle state, an RRC inactive state or an RRC connected state.

[0126] In a possible example, after monitoring whether at least one relay device broadcasts the required target system information within the first time period, the processing unit 402 is further used to: cancel sending the first information to the target relay device if the target system information is monitored within the first time period.

[0127] In a possible example, the target system information is received within a system information time window corresponding to the target system information after the system information requesting device sends the first information.

[0128] In one possible example, after sending the first information to the target relay device in at least one relay device, the processing unit 402 is also used to: if the target system information is not received within the system information time window corresponding to the target system information after sending the first information, then monitor at least one relay device again within the first time period whether it broadcasts the target system information; if the target system information is not monitored within the first time period, resend the first information to the target relay device.

[0129] In the case of an integrated unit, Figure 5 A functional unit block diagram of another system information request device is provided. The system information request device 500 is applied to a target relay device, and specifically includes: a processing unit 502 and a communication unit 503. The processing unit 502 is used to control and manage the actions of the target relay device. For example, the processing unit 502 is used to support the target relay device to execute Figure 3 The steps in and other processes of the technical solution described in this application. The communication unit 503 is used to support communication between the target relay device and other devices in the wireless communication system. The system information request device 500 may also include a storage unit 501 for storing the program code executed by the target relay device and the transmitted data.

[0130] Among them, the processing unit 502 can be a processor or a controller, for example, it can be a CPU, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component or any combination thereof. It can implement or execute various exemplary logic boxes, modules and circuits described in combination with the contents disclosed in this application. The processing unit 502 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, and so on. The communication unit 503 can be a communication interface, a transceiver, a transceiver circuit, etc., and the storage unit 501 can be a memory. When the processing unit 502 is a processor, the communication unit 503 is a communication interface, and the storage unit 501 is a memory, the system information request device 500 involved in the embodiment of the present application can be Figure 7 The relay device shown.

[0131] In specific implementation, the processing unit 502 is used to execute any step executed by the target relay device in the above method embodiment, and when performing data transmission such as sending, the communication unit 503 can be selectively called to complete the corresponding operation.

[0132] The processing unit 502 is used to obtain first information from the terminal, where the first information is used to request forwarding of target system information required by the terminal, and the first information is sent by the terminal when it fails to monitor at least one relay device broadcasting target system information within a first time period.

[0133] It should be noted that Figure 5 The specific implementation of each operation in the embodiment can be seen in detail above Figure 3 The description in the method embodiment shown will not be repeated in detail here.

[0134] It can be seen that in the embodiment of the present application, the system information requesting device obtains the first information from the terminal. Since the first information is used to request the forwarding of the target system information required by the terminal, and the first information is sent by the terminal because it does not monitor the broadcast of the target system information by at least one relay device within the first time period, the present application avoids sending and receiving unnecessary system information requests by first monitoring and then requesting before the terminal needs to request the system information requesting device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0135] In a possible example, the target system information includes other system information except the necessary system information that the target relay device actively forwards to the terminal.

[0136] In a possible example, the necessary system information includes at least one of the following: a master information block, a system information block type 1, a system information block type 2, and direct communication system information block related information.

[0137] In a possible example, the granularity of the target system information requested by the terminal is based on system information SI or system information block SIB.

[0138] In one possible example, the first time period satisfies one of the following: the first time period is a period of time within a preset time, the first time period is configured by the network, the first time period is pre-configured by the system, the first time period is specified by a standard protocol, the first time period is determined by the timeout duration of a preset timer, and the preset time is configured by the network, specified by a standard protocol, or pre-configured by the system.

[0139] In a possible example, the terminal is in a radio resource control RRC idle state, an RRC inactive state, or an RRC connected state.

[0140] In a possible example, the target system information is sent within a system information time window corresponding to the target system information after the target relay device acquires the first information.

[0141] See also Figure 6 , Figure 6 6 is a schematic diagram of a terminal structure provided by an embodiment of the present application. The terminal 600 includes a processor 610, a memory 620, a communication interface 630, and a communication bus for connecting the processor 610, the memory 620, and the communication interface 630.

[0142] The memory 620 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or portable read-only memory (CD-ROM), and is used to store program codes executed by the terminal 600 and data transmitted.

[0143] The communication interface 630 is used to receive and send data.

[0144] The processor 610 may be one or more CPUs. When the processor 610 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0145] The processor 610 in the terminal 600 is used to read one or more programs 621 stored in the memory 620, and perform the following operations: monitor whether at least one relay device broadcasts the required target system information within a first time period; if no target system information is monitored within the first time period, send first information to a target relay device in at least one relay device, and the first information is used to request the target relay device to forward the target system information.

[0146] It should be noted that the specific implementation of each operation can be achieved by using the above Figure 3 The corresponding description of the method embodiment shown in the figure shows that the terminal 600 can be used to execute the terminal side method of the above method embodiment of the present application, which will not be described in detail here.

[0147] It can be seen that the terminal monitors whether at least one relay device broadcasts the target system information within the first time period. Then, if the target system information is not monitored within the first time period, the terminal sends the first information to the target relay device in at least one relay device. Finally, since the first information is used to request the target relay device to forward the target system information, the present application avoids sending unnecessary system information requests by first monitoring and then requesting before the terminal needs to request the target relay device in at least one relay device to forward the required target system information, thereby helping to reduce system signaling overhead and improve system resource utilization.

[0148] See also Figure 7 , Figure 77 is a schematic diagram of a relay device provided in an embodiment of the present application. The relay device 700 includes a processor 710 , a memory 720 , a communication interface 730 , and a communication bus for connecting the processor 710 , the memory 720 , and the communication interface 730 .

[0149] The memory 720 includes but is not limited to RAM, ROM, EPROM or CD-ROM, and is used to store relevant instructions and data.

[0150] The communication interface 730 is used to receive and send data.

[0151] The processor 710 may be one or more CPUs. When the processor 710 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0152] The processor 710 in the relay device 700 is used to read one or more programs 721 stored in the memory 720 to perform the following operations: obtain first information from the terminal, the first information is used to request the target system information required by the forwarding terminal, and the first information is sent by the terminal because it does not monitor at least one relay device broadcasting the target system information within a first time period.

[0153] It should be noted that the specific implementation of each operation can be achieved by using the above Figure 3 The corresponding description of the method embodiment shown, the relay device 700 can be used to execute the method on the target relay device side of the above method embodiment of the present application, which will not be described in detail here. The embodiment of the present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables the computer to execute some or all of the steps described by the terminal or management device in the above method embodiment.

[0154] The present application also provides a computer program product, wherein the computer program product includes a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described by the terminal or management device in the above method embodiment. The computer program product can be a software installation package.

[0155] The steps of the method or algorithm described in the embodiments of the present application can be implemented in a hardware manner, or can be implemented by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (erasable programmable ROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disks, mobile hard disks, read-only compact disks (CD-ROMs) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a terminal or a management device. Of course, the processor and the storage medium can also be present in a terminal or a management device as discrete components.

[0156] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiments of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0157] The modules / units included in the devices and products described in the above embodiments may be software modules / units or hardware modules / units, or may be partially software modules / units and partially hardware modules / units. For example, for the devices and products applied to or integrated in the chip, the modules / units included therein may all be implemented in the form of hardware such as circuits, or at least some of the modules / units may be implemented in the form of software programs, which run on the processor integrated inside the chip, and the remaining (if any) modules / units may be implemented in the form of hardware such as circuits; for the devices and products applied to or integrated in the chip module, the modules / units included therein may all be implemented in the form of hardware such as circuits, and different modules / units may be located in the same component (such as a chip, circuit module, etc.) or different components of the chip module, or at least some of the modules / units may be implemented in the form of hardware such as circuits. The element can be implemented in the form of a software program, which runs on a processor integrated inside the chip module, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits; for various devices and products applied to or integrated in the terminal, the various modules / units contained therein can be implemented in the form of hardware such as circuits, and different modules / units can be located in the same component (for example, chip, circuit module, etc.) or in different components in the terminal, or, at least some modules / units can be implemented in the form of a software program, which runs on a processor integrated inside the terminal, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits.

[0158] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above description is only the specific implementation method of the embodiments of the present application and is not intended to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A system information request method, characterized in that: include: Before the terminal requests a target relay device in at least one relay device to forward the target system information required by the terminal, the terminal monitors whether the at least one relay device broadcasts the target system information within a first time period; In a case where the target system information is not monitored within the first time period, the terminal sends first information to the target relay device, where the first information is used to request the target relay device to forward the target system information.

2. The method according to claim 1, characterized in that The target system information includes other system information except the necessary system information that the target relay device actively forwards to the terminal.

3. The method according to claim 2, characterized in that The necessary system information includes at least one of the following: a master information block, a system information block type 1, a system information block type 2, and direct communication system information block related information.

4. The method according to claim 1, characterized in that: The granularity of the target system information requested by the terminal is based on system information SI or system information block SIB.

5. The method according to claim 1, characterized in that: The first time period satisfies one of the following conditions: the first time period is a period of time within a preset time, the first time period is configured by the network, the first time period is pre-configured by the system, the first time period is specified by a standard protocol, the first time period is determined by the timeout duration of a preset timer, and the preset time is configured by the network, specified by a standard protocol, or pre-configured by the system.

6. The method according to claim 1, characterized in that The terminal is in a radio resource control RRC idle state, an RRC inactive state or an RRC connected state.

7. The method according to any one of claims 1 to 6, characterized in that: After the terminal monitors whether at least one relay device broadcasts required target system information within the first time period, the method further includes: In a case where the target system information is monitored within the first time period, the terminal cancels sending the first information to the target relay device.

8. The method according to any one of claims 1 to 6, characterized in that: The target system information is received within a system information time window corresponding to the target system information after the terminal sends the first information.

9. The method according to claim 8, characterized in that After sending the first information to the target relay device among the at least one relay device, the method further includes: If the terminal does not receive the target system information within the system information time window corresponding to the target system information after sending the first information, the terminal again monitors whether the at least one relay device broadcasts the target system information within the first time period; In the case where the target system information is not monitored within the first time period, the terminal resends the first information to the target relay device.

10. A system information request method, characterized in that: include: The target relay device obtains first information from the terminal, where the first information is used to request the target relay device to forward the target system information required by the terminal, and the first information is sent to the target relay device by the terminal when the terminal does not monitor at least one relay device broadcasting the target system information within a first time period before requesting the target relay device to forward the target system information.

11. The method according to claim 10, characterized in that The target system information includes other system information except the necessary system information that the target relay device actively forwards to the terminal.

12. The method according to claim 11, characterized in that The necessary system information includes at least one of the following: a master information block, a system information block type 1, a system information block type 2, and direct communication system information block related information.

13. The method according to claim 10, characterized in that The granularity of the target system information requested by the terminal is based on system information SI or system information block SIB.

14. The method according to claim 10, characterized in that The first time period satisfies one of the following conditions: the first time period is a period of time within a preset time, the first time period is configured by the network, the first time period is pre-configured by the system, the first time period is specified by a standard protocol, the first time period is determined by the timeout duration of a preset timer, and the preset time is configured by the network, specified by a standard protocol, or pre-configured by the system.

15. The method according to claim 10, characterized in that The terminal is in a radio resource control RRC idle state, an RRC inactive state or an RRC connected state.

16. The method according to any one of claims 10 to 15, characterized in that: The target system information is sent within a system information time window corresponding to the target system information after the target relay device acquires the first information.

17. A system information request device, characterized in that: The device comprises a processing unit and a communication unit, wherein the processing unit is configured to: Before the terminal requests a target relay device in at least one relay device to forward the target system information it needs, monitoring whether at least one relay device broadcasts the target system information within a first time period; When the target system information is not monitored within the first time period, first information is sent to a target relay device in the at least one relay device through the communication unit, where the first information is used to request the target relay device to forward the target system information.

18. A system information request device, characterized in that: The device comprises a processing unit and a communication unit, wherein the processing unit is configured to: The communication unit obtains first information from the terminal, where the first information is used to request forwarding of target system information required by the terminal, and the first information is sent by the terminal when at least one relay device broadcasting the target system information is not heard within a first time period before the terminal requests the target relay device to forward the target system information.

19. A terminal, characterized in that: The method comprises a processor, a memory, a communication interface and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the one or more programs include instructions for executing the steps in the method according to any one of claims 1 to 9.

20. A relay device, characterized in that: The relay device is a target relay device, which includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the one or more programs include instructions for executing the steps in the method described in any one of claims 10-16.

21. A computer-readable storage medium, characterized in that: It stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute the method as claimed in any one of claims 1-9 or 10-16.

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