Resource allocation method in sidelink communication

Abstract

A user equipment and a base station are disclosed, the user equipment comprising at least one processor, where the at least one processor causes the user equipment to: receive resource pool information and area information for side chain communication from the base station; receiving, from the base station, speed threshold information for selecting a resource allocation scheme for side chain communication; selecting the resource allocation scheme based on a comparison result of the speed of the user equipment and a speed threshold; determining side chain resources based on the selected resource allocation scheme; and performing the side chain communication using the determined side chain resource. Therefore, the performance of the communication system can be improved.

Description

[0001] This application is a divisional application of the invention patent application with the application date of May 13, 2020, the entry date of the Chinese national phase on January 5, 2022, the application number 202080049398.1, and the invention name “Resource allocation method in side link communication”. Technical Field

[0002] The present disclosure relates to a sidelink communication technology, and more particularly to a technology for allocating sidelink resources based on terminal speed. Background Art

[0003] Fifth-generation (5G) communication systems (e.g., New Radio (NR) communication systems) are being considered for processing wireless data. Fifth-generation (5G) communication systems use higher frequency bands than fourth-generation (4G) communication systems (e.g., Long Term Evolution (LTE) communication systems or LTE-Advanced (LTE-A) communication systems) and 4G communication systems. 5G communication systems can support enhanced mobile broadband (eMBB) communication, ultra-reliable and low-latency communication (URLLC), massive machine-type communication (mMTC), and the like.

[0004] 4G and 5G communication systems can support vehicle-to-everything (V2X) communication. V2X communication supported in cellular communication systems such as 4G and 5G communication systems can be referred to as "cellular-V2X (C-V2X) communication." V2X communication (e.g., C-V2X communication) can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-network (V2N) communication.

[0005] In a cellular communication system, V2X communication (e.g., C-V2X communication) may be performed based on a sidelink communication technology (e.g., a proximity-based services (ProSe) communication technology, a device-to-device (D2D) communication technology, etc.). For example, a sidelink channel may be established for vehicles participating in V2V communication, and communication between the vehicles may be performed using the sidelink channel.

[0006] At the same time, zones can be configured, and side link resources (e.g., resource pools) can be configured for each zone. Here, a zone can be a geographical zone. A terminal located in a specific zone can use the resources mapped to that specific zone to perform side link communication. Information about the resources mapped to a specific zone can be sent from the base station to the terminal. When the terminal moves at high speed, the zone to which the terminal belongs may change. For example, the zone to which the terminal belongs may change from zone #1 to zone #2. In a state where information about the resources mapped to zone #2 is not obtained from the base station, the terminal located in zone #2 can use the resources mapped to the previous zone (i.e., zone #1) to perform side link communication. In this case, the performance of the side link communication may degrade, and a method for solving this problem may be needed. Summary of the Invention

[0007] An object of the present disclosure to solve the above-mentioned problem is to provide a method for allocating resources in sidelink communication by considering terminal speed.

[0008] According to a first exemplary embodiment of the present disclosure, an operating method of a terminal for achieving this purpose may include: receiving a first message from a base station, the first message including a mobility condition for selecting a resource allocation scheme for side link communication; selecting a resource allocation scheme applied to the terminal based on a result of comparing the mobility of the terminal and the mobility condition; determining a resource pool based on the selected resource allocation scheme; and performing side link communication using the determined resource pool, wherein the resource allocation scheme is divided into a type 1-resource allocation scheme and a type 2-resource allocation scheme, and wherein in the type 1-resource allocation scheme, the resource pool is configured based on an area including multiple zones, and in the type 2-resource allocation scheme, the resource pool is configured based on a zone.

[0009] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0010] The mobility of the terminal may be a speed change; when the speed change of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed change of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0011] The first message may also include one or more zone lists and speed thresholds belonging to each area.

[0012] The operating method may also include receiving a second message from the base station, the second message including first mapping information between the area and the resource pool and second mapping information between the area and the resource pool, wherein the resource pool for sidelink communication is determined based on the first mapping information or the second mapping information.

[0013] The operating method may further include sending a third message to the base station, the third message including at least one of information indicating the selected resource allocation scheme, an identifier of the zone to which the terminal belongs, an identifier of the area to which the terminal belongs, a determined resource pool, or a combination thereof.

[0014] According to a second exemplary embodiment of the present disclosure, an operating method of a base station for achieving this purpose may include: sending a first message to a terminal, the first message including a mobility condition for selecting a resource allocation scheme for side link communication; and sending a second message to the terminal, the second message including first mapping information between an area and a resource pool and second mapping information between a zone and a resource pool, each of the areas including multiple zones, wherein the resource allocation scheme is divided into a type 1-resource allocation scheme and a type 2-resource allocation scheme, and wherein in the type 1-resource allocation scheme, the resource pool is configured based on the area including multiple zones, and in the type 2-resource allocation scheme, the resource pool is configured based on the zone.

[0015] The operating method may further include receiving a third message from the base station, the third message including information indicating a resource allocation scheme selected by the terminal based on a result of comparing the mobility of the terminal and the mobility condition.

[0016] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0017] The mobility of the terminal may be a speed change; when the speed change of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed change of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0018] According to a third exemplary embodiment of the present disclosure, an operating method of a terminal for achieving this purpose may include: sending a first message including mobility information of the terminal to a base station; receiving a second message from the base station, the second message including information indicating a resource allocation scheme selected based on a result of comparing the mobility information and the mobility condition; determining a resource pool for side link communication based on the resource allocation scheme; and performing side link communication using the resource pool, wherein the resource allocation scheme is divided into type 1-resource allocation scheme and type 2-resource allocation scheme, and wherein in type 1-resource allocation scheme, the resource pool is configured based on an area including multiple zones, and in type 2-resource allocation scheme, the resource pool is configured based on a zone.

[0019] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the resource allocation scheme selected by the base station may be the type 1-resource allocation scheme; and when the speed of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the resource allocation scheme selected by the base station may be the type 2-resource allocation scheme.

[0020] The mobility of the terminal may be a speed change; when the speed change of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the resource allocation scheme selected by the base station may be the type 1-resource allocation scheme; and when the speed change of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the resource allocation scheme selected by the base station may be the type 2-resource allocation scheme.

[0021] The operating method may further include receiving first mapping information between the area and the resource pool and second mapping information between the area and the resource pool from the base station, wherein the resource pool for the sidelink communication is determined based on the first mapping information or the second mapping information.

[0022] The first message may further include location information of the terminal, the first mapping information may include information about a resource pool mapped to an area corresponding to the location information, and the second mapping information may include information about a resource pool mapped to an area corresponding to the location information.

[0023] According to a fourth exemplary embodiment of the present disclosure, an operating method of a base station for achieving this purpose may include: receiving a first message including mobility information of the terminal from a terminal; selecting a resource allocation scheme for side link communication based on a result of comparing the mobility information and the mobility condition; and sending a second message including information indicating the resource allocation scheme to the terminal, wherein the resource allocation scheme is divided into type 1-resource allocation scheme and type 2-resource allocation scheme, and wherein in the type 1-resource allocation scheme, the resource pool is configured based on an area including multiple areas, and in the type 2-resource allocation scheme, the resource pool is configured based on the area.

[0024] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0025] The mobility of the terminal may be a speed change; when the speed change of the terminal satisfies the mobility condition for applying the type 1-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed change of the terminal satisfies the mobility condition for applying the type 2-resource allocation scheme in the mobility condition, the selected resource allocation scheme may be the type 2-resource allocation scheme.

[0026] The operating method may further include sending first mapping information between the area and the resource pool and second mapping information between the area and the resource pool to the terminal, wherein the resource pool for the sidelink communication is determined based on the first mapping information or the second mapping information.

[0027] The first message may further include location information of the terminal, the first mapping information may include information about a resource pool mapped to an area corresponding to the location information, and the second mapping information may include information about a resource pool mapped to an area corresponding to the location information.

[0028] According to the present disclosure, the resource allocation scheme for side link communication can be determined based on the mobility information (e.g., speed, speed change) of the terminal. In the type 1-resource allocation scheme, the side link resources (e.g., resource pool) of each area can be configured, and in the type 2-resource allocation scheme, the side link resources of each area can be configured. When the speed of the terminal is equal to or greater than the threshold, the type 1-resource allocation scheme can be used, and when the speed of the terminal is less than the threshold, the type 2-resource allocation scheme can be used. Even when the type 1-resource allocation scheme is used and the area to which the terminal belongs changes within the same area, the terminal can also use the same resource pool (e.g., a resource pool mapped to the area) to perform side link communication. Therefore, the problem of conflict between side link resources can be solved, and the performance of the communication system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a conceptual diagram illustrating a V2X communication scenario.

[0030] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of a cellular communication system.

[0031] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0032] Figure 4 is a block diagram illustrating an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communication.

[0033] Figure 5 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0034] Figure 6 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0035] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of zones in a cellular communication system.

[0036] Figure 8 is a flowchart illustrating a first exemplary embodiment of a side link communication method according to terminal speed.

[0037] Figure 9 is a flowchart illustrating a second exemplary embodiment of a side link communication method according to terminal speed. DETAILED DESCRIPTION

[0038] Although the present disclosure is susceptible to various modifications and alternative forms, specific embodiments are shown and described in detail by way of example in the drawings. However, it should be understood that this description is not intended to limit the present disclosure to the specific embodiments, but on the contrary, the present disclosure covers all modifications, equivalents and alternatives that fall within the spirit and scope of the present disclosure.

[0039] Although the terms "first," "second," and the like may be used herein with reference to various elements, these elements should not be construed as being limited by these terms. These terms are merely used to distinguish one element from another. For example, a first element may be referred to as a second element, and a second element may be referred to as a first element, without departing from the scope of this disclosure. The term "and / or" includes any and all combinations of one or more of the related listed items.

[0040] It should be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements.

[0041] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the embodiments of the present disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, wholes, steps, operations, elements, parts, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts, and / or combinations thereof.

[0042] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should also be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0043] Hereinafter, preferred exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure, in order to facilitate overall understanding, the same reference numerals refer to the same elements throughout the description of the accompanying drawings, and their repeated description will be omitted.

[0044] Figure 1 is a conceptual diagram illustrating a V2X communication scenario.

[0045] like Figure 1 As shown, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication may be supported by a cellular communication system (e.g., cellular communication system 140), and V2X communication supported by the cellular communication system 140 may be referred to as "cellular-V2X (C-V2X) communication." Here, the cellular communication system 140 may include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0046] V2V communication may include communication between a first vehicle 100 (e.g., a communication node located in vehicle 100) and a second vehicle 110 (e.g., a communication node located in vehicle 110). Various driving information, such as speed, heading, time, location, etc., may be exchanged between vehicle 100 and vehicle 110 through V2V communication. For example, based on the driving information exchanged through V2V communication, autonomous driving (e.g., platooning) may be supported. The V2V communication supported in the cellular communication system 140 may be performed based on a "sidelink" communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between vehicle 100 and vehicle 110 may be performed using at least one sidelink channel established between vehicle 100 and vehicle 110.

[0047] V2I communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and infrastructure (e.g., a roadside unit (RSU)) 120 located on the roadside. The infrastructure 120 may also include traffic lights or streetlights located on the roadside. For example, when performing V2I communication, communication may be performed between the communication node located in the first vehicle 100 and the communication node located in the traffic light. Traffic information, driving information, etc. may be exchanged between the first vehicle 100 and the infrastructure 120 through V2I communication. The V2I communication supported in the cellular communication system 140 may also be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the vehicle 100 and the infrastructure 120 may be performed using at least one sidelink channel established between the vehicle 100 and the infrastructure 120.

[0048] V2P communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and the person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and movement information of the person 130, such as speed, heading, time, location, etc., may be exchanged between the vehicle 100 and the person 130 through V2P communication. The communication node located in the vehicle 100 or the communication node carried by the person 130 may generate an alert indicating danger by determining a dangerous situation based on the obtained driving information and movement information. The V2P communication supported in the cellular communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, the communication between the communication node located in the vehicle 100 and the communication node carried by the person 130 may be performed using at least one sidelink channel established between the communication nodes.

[0049] V2N communication may be communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and a server connected via the cellular communication system 140. V2N communication may be performed based on 4G communication technology (e.g., LTE or LTE-A) or 5G communication technology (e.g., NR). In addition, V2N communication may be performed based on Wireless Access in Vehicle Environments (WAVE) communication technology, wireless local area network (WLAN) communication technology defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11, or wireless personal area network (WPAN) communication technology defined in IEEE 802.15.

[0050] Meanwhile, the cellular communication system 140 supporting V2X communication may be configured as follows.

[0051] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of a cellular communication system.

[0052] like Figure 2 As shown, the cellular communication system may include an access network, a core network, etc. The access network may include a base station 210, a relay 220, user equipments (UEs) 231 to 236, etc. The UEs 231 to 236 may include Figure 1 The communication nodes in the vehicles 100 and 110 are located Figure 1 The communication nodes in the infrastructure 120 are Figure 1 When the cellular communication system supports 4G communication technology, the core network may include a serving gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, and the like.

[0053] When the cellular communication system supports 5G communication technology, the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, etc. Alternatively, when the cellular communication system operates in a non-standalone (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 may support 5G communication technology as well as 4G communication technology, and the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support 4G communication technology as well as 5G communication technology.

[0054] In addition, when the cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices supporting V2X communication (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.) can be configured, and V2X communication can be supported by the V2X network slices configured in the core network.

[0055] The communication nodes comprising a cellular communication system (e.g., base stations, repeaters, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) may perform communication by using at least one communication technology selected from code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiple access (OFDM) technology, filtered OFDM technology, orthogonal frequency division multiple access (OFDMA) technology, single carrier FDMA (SC-FDMA) technology, non-orthogonal multiple access (NOMA) technology, generalized frequency division multiplexing (GFDM) technology, filter bank multi-carrier (FBMC) technology, universal filtered multi-carrier (UFMC) technology, and spatial division multiple access (SDMA) technology.

[0056] The communication nodes (e.g., base stations, relays, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) comprising a cellular communication system may be configured as follows.

[0057] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0058] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network for performing communication. In addition, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can communicate with each other when connected through a bus 370.

[0059] However, each of the components included in the communication node 300 may be connected to the processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transceiver 330, the input interface device 340, the output interface device 350, and the storage device 360 via a dedicated interface.

[0060] The processor 310 may execute at least one instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 may be a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor that executes the method according to an embodiment of the present disclosure. Each of the memory 320 and the storage device 360 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0061] Reference again Figure 2 In the communication system, the base station 210 may form a macro cell or a small cell and may be connected to the core network via an ideal backhaul or a non-ideal backhaul. The base station 210 may transmit signals received from the core network to the UEs 231 to 236 and the relay 220, and may transmit signals received from the UEs 231 to 236 and the relay 220 to the core network. The UEs 231, 232, 234, 235, and 236 may belong to the cell coverage of the base station 210. The UEs 231, 232, 234, 235, and 236 may be connected to the base station 210 by performing a connection establishment procedure with the base station 210. The UEs 231, 232, 234, 235, and 236 may communicate with the base station 210 after being connected to the base station 210.

[0062] Relay 220 can be connected to base station 210 and can relay communications between base station 210 and UEs 233 and 234. That is, relay 220 can transmit signals received from base station 210 to UEs 233 and 234, and can transmit signals received from UEs 233 and 234 to base station 210. UE 234 can be within the cell coverage of base station 210 and the cell coverage of relay 220, and UE 233 can be within the cell coverage of relay 220. That is, UE 233 can be outside the cell coverage of base station 210. UEs 233 and 234 can connect to relay 220 by performing a connection establishment procedure with relay 220. After connecting to relay 220, UEs 233 and 234 can communicate with relay 220.

[0063] The base station 210 and the relay 220 may support multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multi-point (CoMP) communication technology, carrier aggregation (CA) communication technology, unlicensed band communication technology (e.g., licensed assisted access (LAA), enhanced LAA (eLAA)), sidelink communication technology (e.g., ProSe communication technology, D2D communication technology), etc. UEs 231, 232, 235, and 236 may perform operations corresponding to the base station 210 and operations supported by the base station 210. UEs 233 and 234 may perform operations corresponding to the relay 220 and operations supported by the relay 220.

[0064] Here, the base station 210 may be referred to as a Node B (NB), an evolved Node B (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmit receive point (TRP), a radio unit (RU), a roadside unit (RSU), a radio transceiver, an access point, an access node, etc. The relay 220 may be referred to as a small base station, a relay node, etc. Each of the UEs 231 to 236 may be referred to as a terminal, an access terminal, a mobile terminal, a station, a user station, a mobile station, a portable user station, a node, a device, an onboard unit (OBU), etc.

[0065] At the same time, the communication between UE235 and UE236 can be performed based on the side link communication technology. The side link communication can be performed based on a one-to-one scheme or a one-to-many scheme. When the V2V communication is performed using the side link communication technology, UE235 can be located at Figure 1 The communication node in the first vehicle 100, UE236 may be located Figure 1 When V2I communication is performed using the sidelink communication technology, the UE 235 may be a communication node located in the second vehicle 110. Figure 1 The communication node in the first vehicle 100, UE236 may be located Figure 1 When V2P communication is performed using the sidelink communication technology, the UE 235 may be a communication node located in the infrastructure 120. Figure 1 The communication node in the first vehicle 100, UE236 may be composed of Figure 1 The person 130 carries the communication node.

[0066] According to the locations of the UEs (eg, UE 235 and 236) participating in the side link communication, the scenarios in which the side link communication is applied can be classified as shown in Table 1 below. For example, Figure 2 The sidelink communication scenario between UE 235 and UE 236 shown may be sidelink communication scenario C.

[0067] [Table 1]

[0068]

[0069] Meanwhile, a user plane protocol stack of a UE (eg, UE 235 and 236 ) performing sidelink communication may be configured as follows.

[0070] Figure 4 is a block diagram illustrating an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communication.

[0071] like Figure 4 As shown, the left UE can be Figure 2 UE235 shown, the right UE can be Figure 2 The sidelink communication scenario between UE 235 and UE 236 may be one of the sidelink communication scenarios A to D in Table 1. The user plane protocol stack of each of UE 235 and 236 may include a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer.

[0072] Sidelink communication between UE 235 and UE 236 may be performed using a PC5 interface (e.g., a PC5-U interface). A layer-2 identifier (ID) (e.g., source layer-2 ID, destination layer-2 ID) may be used for sidelink communication, and the layer-2 ID may be an ID configured for V2X communication (e.g., V2X service). Furthermore, in sidelink communication, hybrid automatic repeat request (HARQ) feedback operation may be supported, and RLC acknowledged mode (RLC AM) or RLC unacknowledged mode (RLC UM) may be supported.

[0073] Meanwhile, a control plane protocol stack of a UE (eg, UE 235 and 236 ) performing sidelink communication may be configured as follows.

[0074] Figure 5 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication, Figure 6 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0075] like Figure 5 and Figure 6 As shown, the left UE can be Figure 2 UE235 shown, the right UE can be Figure 2 The sidelink communication scenario between UE 235 and UE 236 may be one of the sidelink communication scenarios A to D in Table 1. Figure 5The illustrated control plane protocol stack may be a control plane protocol stack for transmitting and receiving broadcast information (eg, a physical sidelink broadcast channel (PSBCH)).

[0076] Figure 5 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer.Sidelink communication between UE 235 and UE 236 may be performed using a PC5 interface (eg, a PC5-C interface). Figure 6 The control plane protocol stack shown may be a control plane protocol stack for one-to-one sidelink communication. Figure 6 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0077] Meanwhile, the channels used in the sidelink communication between UE 235 and UE 236 may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). The PSSCH may be used to transmit and receive sidelink data and may be configured in the UE (e.g., UE 235 or 236) through higher layer signaling. The PSCCH may be used to transmit and receive sidelink control information (SCI) and may also be configured in the UE (e.g., UE 235 or 236) through higher layer signaling.

[0078] The PSDCH can be used for discovery procedures. For example, a discovery signal can be sent via the PSDCH. The PSBCH can be used to send and receive broadcast information (e.g., system information). In addition, a demodulation reference signal (DM-RS), synchronization signals, etc. can be used for sidelink communications between UE 235 and UE 236. Synchronization signals can include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

[0079] Meanwhile, as shown in Table 2 below, sidelink transmission modes (TMs) may be divided into sidelink TM1 to 4.

[0080] [Table 2]

[0081] SidelinkTM describe 1 Use the resources scheduled by the base station for transmission 2 UE autonomous transmission without base station scheduling 3 Transmission using base station scheduled resources in V2X communications 4 UE autonomous transmission in V2X communication without base station scheduling

[0082] When supporting sidelink TM3 or 4, each of the UEs 235 and 236 may perform sidelink communication using a resource pool configured by the base station 210. A resource pool may be configured for each of the sidelink control information and the sidelink data.

[0083] The resource pool for sidelink control information can be configured based on an RRC signaling process (e.g., a dedicated RRC signaling process, a broadcast RRC signaling process). The resource pool for receiving sidelink control information can be configured through a broadcast RRC signaling process. When sidelink TM3 is supported, the resource pool for sending sidelink control information can be configured through a dedicated RRC signaling process. In this case, the sidelink control information can be sent through resources scheduled by the base station 210 within the resource pool configured by the dedicated RRC signaling process. When sidelink TM4 is supported, the resource pool for sending sidelink control information can be configured through a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the sidelink control information can be sent through resources autonomously selected by the UE (e.g., UE 235 or 236) within the resource pool configured by the dedicated RRC signaling process or the broadcast RRC signaling process.

[0084] When sidelink TM3 is supported, a resource pool for transmitting and receiving sidelink data may not be configured. In this case, sidelink data can be transmitted and received using resources scheduled by base station 210. When sidelink TM4 is supported, a resource pool for transmitting and receiving sidelink data can be configured using a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink data can be transmitted and received using resources autonomously selected by a UE (e.g., UE 235 or 236) within a resource pool configured using a dedicated RRC signaling procedure or a broadcast RRC signaling procedure.

[0085] Hereinafter, a side link multicast communication method will be described. Even when describing a method to be performed at a first communication node in a communication node (e.g., sending or receiving a signal), the corresponding second communication node may also perform a method corresponding to the method performed at the first communication node (e.g., receiving or sending a signal). That is, when describing the operation of UE#1 (e.g., vehicle #1), the corresponding UE#2 (e.g., vehicle #2) may perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 may perform an operation corresponding to the operation of UE#2. In the exemplary embodiment described below, the operation of the vehicle may be the operation of a communication node located in the vehicle.

[0086] Sidelink signals may be synchronization signals and reference signals used for sidelink communications. For example, synchronization signals may be synchronization signal / physical broadcast channel (SS / PBCH) blocks, sidelink synchronization signals (SLSS), primary sidelink synchronization signals (PSSS), secondary sidelink synchronization signals (SSSS), etc. Reference signals may be channel state information reference signals (CSI-RS), DM-RS, phase tracking reference signals (PT-RS), cell-specific reference signals (CRS), sounding reference signals (SRS), discovery reference signals (DRS), etc.

[0087] The sidelink channel may be a PSSCH, PSCCH, PSDCH, PSBCH, physical sidelink feedback channel (PSFCH), etc. In addition, a sidelink channel may refer to a sidelink channel including a sidelink signal mapped to specific resources in the corresponding sidelink channel. Sidelink communication may support broadcast services, multicast services, groupcast services, and unicast services.

[0088] At the same time, zones for sidelink communication can be configured. Zones can be geographic zones. Sidelink resources (e.g., resource pools) can be configured for each zone. That is, a mapping relationship between zones and sidelink resources can be configured. The base station can configure zones and can configure the sidelink resources mapped to each zone. Alternatively, these zones can be pre-defined in technical specifications. These zones can be configured as follows.

[0089] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of zones in a cellular communication system.

[0090] like Figure 7 As shown, multiple zones can be configured, and a unique single reference point in the world can be configured for multiple zones. The reference point can be a fixed point. The geographical coordinates of the reference point can be set to (0, 0). The geographical coordinates of each zone can be represented based on the reference point. An area can be composed of one or more zones. For example, area #1 can include zones #10 to #15, and area #2 can include zones #20 to #25. Different resources (e.g., different resource pools) can be mapped between adjacent zones. Each of areas #1 and #2 can be a tracking area (TA) or a valid area. Similarly, the same system information can be used within an area. The zone can have a length and a width. The zone identifier (ID) can be determined based on the length of the zone, the width of the zone, the number of zones, the reference point, the geographical coordinates of the terminal, etc. The number of zones can include the number of zones located in a first direction (e.g., a longitudinal direction) and the number of zones located in a second direction (e.g., a width direction). A modulo operation can be performed to determine the zone ID.

[0091] When a terminal is within the coverage of a base station, the base station may send zone configuration information to the terminal. The zone configuration information may include the zone length, zone width, number of zones, etc. Terminals outside the coverage of the base station may use the predefined zone configuration information (e.g., zone length, zone width, number of zones, etc.) predefined in the technical specifications.

[0092] At the same time, the base station may send configuration information (e.g., reporting period) for reporting the terminal's geographic location information (e.g., geographic coordinates) to the terminal. The terminal (e.g., a terminal operating in an RRC connected state within the coverage area of the base station) may receive the configuration information for geographic location information reporting from the base station and, based on the configuration information, may report its current geographic location information to the base station. The terminal's geographic location information may be sent according to a preset period.

[0093] The base station may receive geographic location information from the terminal and may identify the zone to which the terminal belongs based on the geographic location information. The base station may transmit system information (e.g., System Information Block (SIB) 21) including information about resources (e.g., resource pools) mapped to the zone to which the terminal belongs. The terminal may receive system information from the base station and, based on the system information, may identify information about resources mapped to the zone to which the terminal belongs. The terminal may perform sidelink communication using the resources (e.g., resource pools) indicated by the system information.

[0094] A terminal outside the coverage of a base station can identify resources (eg, a resource pool) mapped to the zone to which the terminal belongs based on the mapping relationship between zones and resources defined in the technical specifications. The terminal can use the identified resources to perform sidelink communication.

[0095] At the same time, when the terminal moves at high speed, the terminal may not know the information about the resources mapped to the zone to which it belongs when performing side link communication. For example, a terminal located in zone #14 can perform side link communication based on information about resources (e.g., a resource pool mapped to zone #14) received from the base station, and then can move to zone #12. Since the geographical location information of the terminal is periodically reported to the base station, even if the terminal is located in zone #12, it may not be able to report its geographical location information (i.e., changed geographical location information) to the base station before the next reporting period. In this case, since the terminal cannot obtain information about the resources mapped to zone #12 from the base station, the terminal can perform side link communication in zone #12 using resources mapped to the previous zone (i.e., zone #14). For this reason, conflicts between side link resources may occur, and the performance of side link communication may deteriorate.

[0096] To solve this problem, the resource allocation scheme can be changed according to the speed of the terminal. The resource allocation scheme can be divided into type 1 resource allocation scheme and type 2 resource allocation scheme.

[0097] Type 1 - Resource allocation scheme can be a scheme that allocates side link resources (e.g., resource pool) based on regions. A region can include multiple zones. For example, Figure 7 Region #1 shown may include zones #10 to #15, Figure 7 The area #2 shown may include areas #20 to #25. When using the type 1 resource allocation scheme, different side link resources may be configured for each area, and the same side link resources may be configured for areas belonging to the same area. The terminal may use the side link resources mapped to the area where the terminal is located. Figure 7 In the illustrated exemplary embodiment, even when the zone where the terminal is located changes from zone #14 to zone #12, since the area to which the terminal belongs does not change from zone #1, the terminal can use the same side link resources despite the zone change.

[0098] A Type 2 resource allocation scheme may allocate sidelink resources (e.g., a resource pool) based on a zone. When using a Type 2 resource allocation scheme, different sidelink resources may be configured for each zone. A terminal may use the sidelink resources mapped to the zone in which the terminal is located. Sidelink communication based on a Type 1 resource allocation scheme or a Type 2 resource allocation scheme may be performed as follows.

[0099] Figure 8 is a flowchart illustrating a first exemplary embodiment of a side link communication method according to terminal speed.

[0100] like Figure 8 As shown, the communication system may include a base station and a terminal. The base station may be Figure 2 The base station 210 shown, the terminal can be Figure 2 The base station and the terminal can communicate with UE235 or UE236. Figure 3 The communication nodes 300 shown are configured identically or similarly. Figures 4 to 6 The protocol stack shown. The terminal can be connected to the base station and can perform sidelink communication based on the scheduling of the base station. Alternatively, the terminal can be located outside the coverage of the base station and can perform sidelink communication without the scheduling of the base station.

[0101] The base station may generate system information (e.g., SIB1, SIB21, or SIB26), the system information including one or more information elements described in Table 3 below. The base station may send the system information to the terminal (S801). The system information may include a mobility condition (e.g., type 1-mobility state, type 2-mobility state, type 1-mobility state change, type 2-mobility state change) for selecting a resource allocation scheme (e.g., type 1-resource allocation scheme or type 2-resource allocation scheme) applied to the terminal. The mobility condition may include "type 1-mobility state and type 2-mobility state", "type 1-mobility state change and type 2-mobility state change", or "type 1-mobility state, type 2-mobility state, type 1-mobility state change, and type 2-mobility state change".

[0102] [Table 3]

[0103]

[0104] The mobility state (i.e., speed) of the terminal can be divided into two states (e.g., high speed, low speed) or three states (e.g., high speed, medium speed, low speed). When the mobility state is divided into two states, the type 1 mobility state can be high speed, and the type 2 mobility state can be low speed. In this case, a speed threshold can be configured, and a speed equal to or greater than the speed threshold can be determined as high speed, and a speed less than the speed threshold can be determined as low speed. In addition, the type 1 mobility state change can be "low speed → high speed", and the type 2 mobility state change can be "high speed → low speed".

[0105] When the mobility state is divided into three states, type 1-mobility state can be high speed, and type 2-mobility state can be medium speed and low speed. In this case, two speed thresholds can be configured, and a speed equal to or greater than speed threshold #1 can be determined as high speed, a speed less than speed threshold #1 and equal to or greater than speed threshold #2 can be determined as medium speed, and a speed less than speed threshold #2 can be determined as low speed. In addition, type 1-mobility state change can be "low speed→high speed" or "medium speed→high speed", and type 2-mobility state change can be "high speed→medium speed", "high speed→low speed", "medium speed→low speed" or "low speed→medium speed". The mobility state change can be a speed change measured in a measurement period pre-configured by the base station (e.g., two measurement points). Information about the pre-configured measurement period (e.g., two measurement points) can be included in the system information sent in step S801.

[0106] Alternatively, when mobility states are classified into three states, Type 1 mobility states can be high speed and medium speed, and Type 2 mobility states can be low speed. In this case, two speed thresholds can be configured: a speed equal to or greater than Speed Threshold #1 can be determined as high speed, a speed less than Speed Threshold #1 and equal to or greater than Speed Threshold #2 can be determined as medium speed, and a speed less than Speed Threshold #2 can be determined as low speed. Furthermore, Type 1 mobility state changes can be "low speed → medium speed," "low speed → high speed," or "medium speed → high speed," and Type 2 mobility state changes can be "high speed → low speed" or "medium speed → low speed."

[0107] System information (e.g., SI-SchedulingInfo in the system information) including one or more information elements described in Table 3 may be configured as shown in the following Tables 4 to 6. In Table 4, ListofZoneIDsAssociatedwithAreaID may be a list of area IDs, AreaApplyState may be a type 1 mobility state, ZoneApplyState may be a type 2 mobility state, AreaApplyStateTransition may be a type 1 mobility state change, ZoneApplyStateTransition may be a type 2 mobility state change, and SpeedThreshold may be a speed threshold.

[0108] [Table 4]

[0109]

[0110]

[0111] [Table 5]

[0112]

[0113] [Table 6]

[0114]

[0115]

[0116] The terminal may receive system information from the base station and may identify information elements included in the system information (e.g., information elements listed in Table 3). For example, the terminal may determine its mobility state (e.g., high speed, medium speed, or low speed) and may select a resource allocation scheme to be used based on the mobility state (e.g., type 1-resource allocation scheme or type 2-resource allocation scheme) (S802). When the mobility state of the terminal is type 1-mobility state, the terminal may determine that the type 1-resource allocation scheme will be used for sidelink communication. When the mobility state of the terminal is type 2-mobility state, the terminal may determine that the type 2-resource allocation scheme will be used for sidelink communication.

[0117] Alternatively, the terminal may determine a change in its mobility state (e.g., "low speed → medium speed," "low speed → high speed," "medium speed → high speed," "medium speed → low speed," "high speed → medium speed," or "high speed → low speed"), and may select a resource allocation scheme (e.g., type 1-resource allocation scheme or type 2-resource allocation scheme) based on the mobility state change (S802). When the mobility state change of the terminal is type 1-mobility state change, the terminal may determine that the type 1-resource allocation scheme will be used for sidelink communication. When the mobility state change of the terminal is type 2-mobility state change, the terminal may determine that the type 2-resource allocation scheme will be used for sidelink communication.

[0118] At the same time, the base station can configure side link resources (e.g., resource pools) for each zone, and configure side link resources (e.g., resource pools) for each area. In the type 1 resource allocation scheme, the side link resources of each area can be configured differently, the side link resources of the areas belonging to the same area can be the same, and the side link resources of the areas belonging to different areas can be different. In the type 2 resource allocation scheme, the side link resources of each area can be configured differently.

[0119] The base station may send system information (e.g., SIB1, SIB21, SIB26) including "mapping information between zones and side link resources" and / or "mapping information between areas and side link resources" to the terminal (S803). The mapping information between zones and side link resources may include the ID of the zone (e.g., zone ID), information about the side link resources mapped to the zone, etc. The mapping information between zones and side link resources may include the ID of the zone (e.g., zone ID), a list of zones belonging to the zone, information about the side link resources mapped to the zone, etc. The terminal may identify the mapping information between zones and side link resources and / or the mapping information between zones and side link resources by receiving system information from the base station.

[0120] In step S801, mapping information between the zone and the side link resource and / or mapping information between the area and the side link resource may be transmitted. In this case, the terminal may perform step S802 after identifying the mapping information between the zone and the side link resource and / or mapping information between the area and the side link resource included in the system information.

[0121] When Type 1 - Resource Allocation Scheme is selected in step S802, the terminal can identify the region to which the terminal belongs and identify the sidelink resources (e.g., resource pool) mapped to the region to which the terminal belongs based on the system information (S804). When Type 2 - Resource Allocation Scheme is selected in step S802, the terminal can identify the region to which the terminal belongs and identify the sidelink resources (e.g., resource pool) mapped to the region to which the terminal belongs based on the system information (S804).

[0122] In addition, the terminal may generate a message including one or more information elements shown in Table 7 below, and may send the generated message to the base station (S805). Step S805 may be performed selectively. The message sent in step S805 may be sidelink UE information or UE assistance information. The base station may identify one or more information elements listed in Table 7 below by receiving the message from the terminal.

[0123] [Table 7]

[0124]

[0125] The terminal may perform sidelink communication using sidelink resources (eg, a resource pool) mapped to the area or zone to which the terminal belongs (S806). When performing sidelink communication, the terminal may notify the base station of its geographic location information according to a preset period.

[0126] Figure 9 is a flowchart illustrating a second exemplary embodiment of a side link communication method according to terminal speed.

[0127] like Figure 9 As shown, the communication system may include a base station and a terminal. The base station may be Figure 2 The base station 210 shown, the terminal can be Figure 2 The base station and the terminal can communicate with UE235 or UE236. Figure 3 The communication nodes 300 shown are configured identically or similarly. Figures 4 to 6 The protocol stack shown. The terminal can be connected to the base station and can perform sidelink communication based on the scheduling of the base station. Alternatively, the terminal can be located outside the coverage of the base station and can perform sidelink communication without scheduling the base station.

[0128] The base station may send system information (e.g., SIB1, SIB21, SIB26) to the terminal, where the system information includes mapping information between the zone and the side link resource and / or mapping information between the zone and the side link resource (S901). The mapping information between the zone and the side link resource and / or mapping information between the zone and the side link resource may be sent via an RRC connection reconfiguration message instead of the system information. Alternatively, the mapping information between the zone and the side link resource and / or mapping information between the zone and the side link resource may be sent in step S904.

[0129] The mapping information between the zone and the side link resource may include an identifier of the zone (e.g., zone ID), information about the side link resource mapped to the zone, etc. The mapping information between the zone and the side link resource may include an identifier of the zone (e.g., zone ID), a list of zones belonging to the zone, information about the side link resource mapped to the zone, etc. The terminal may identify the mapping information between the zone and the side link resource and / or the mapping information between the zone and the side link resource by receiving system information from the base station.

[0130] The terminal may send a measurement report message including mobility state information or mobility state change information to the base station (S902). In addition, the measurement report message may also include the terminal's location information. The terminal's location information may include at least one of a geographic location, a moving path, a moving direction, or a combination thereof. The measurement report message may be sent according to a preset period. The measurement report message may include sidelink UE information or UE assistance information.

[0131] The mobility state information may be the speed of the terminal. When a speed threshold is preconfigured by the base station, the terminal may determine its own speed as high, medium, or low. When the speed of the terminal is divided into two speeds (e.g., high or low), the mobility state information may indicate high or low. When the speed of the terminal is divided into three speeds (e.g., high, medium, or low), the mobility state information may indicate high, medium, or low.

[0132] The mobility state change may be a speed change of the terminal. When the speed threshold and the measurement period (e.g., measurement point) are pre-configured by the base station, the terminal may determine its speed change as "low speed → medium speed", "low speed → high speed", "medium speed → high speed", "medium speed → low speed", "high speed → medium speed" or "high speed → low speed". When the speed of the terminal is classified into two speeds (e.g., high speed or low speed), the mobility state change information may indicate "low speed → high speed" or "high speed → low speed". When the speed of the terminal is classified into three speeds (e.g., high speed, medium speed or low speed), the mobility state change information may indicate "low speed → medium speed", "low speed → high speed", "medium speed → high speed", "medium speed → low speed", "high speed → medium speed" or "high speed → low speed".

[0133] The measurement report message may include one or more information elements listed in the following Tables 8 to 11. MobilityState in Table 9 may be mobility state information, and MobilityStateTransition in Table 9 may be mobility state change information.

[0134] [Table 8]

[0135]

[0136] [Table 9]

[0137]

[0138] [Table 10]

[0139]

[0140]

[0141] [Table 11]

[0142]

[0143]

[0144] The base station may receive a measurement report message from the terminal and, based on the mobility state information or mobility state change information included in the measurement report message, may select a resource allocation scheme (e.g., a type 1 resource allocation scheme or a type 2 resource allocation scheme) to be applied to the terminal. For example, when the speed of the terminal is high, or when the speed change of the terminal is "medium speed → high speed" or "low speed → high speed", the base station may determine that the type 1 resource allocation scheme will be applied to the terminal. When the speed of the terminal is medium or low, or when the speed change of the terminal is "high speed → medium speed", "high speed → low speed", "medium speed → low speed" or "low speed → medium speed", the base station may determine that the type 2 resource allocation scheme will be applied to the terminal.

[0145] The base station may generate an RRC message including information indicating a resource allocation scheme to be applied to the terminal, and may send the RRC message to the terminal (S904). The RRC message may be an RRC connection reconfiguration message. The RRC message may also include mapping information between the zone and the side link resources and / or mapping information between the zone and the side link resources. The base station knowing the location information of the terminal (e.g., geographic location, moving direction) may estimate the zone or region to which the terminal belongs. Therefore, the RRC message sent in step S904 may include information about the side link resources mapped to the zone to which the terminal belongs, or information about the side link resources mapped to the region to which the terminal belongs.

[0146] In a 4G communication system (e.g., an LTE communication system), the RRC message may include one or more information elements listed in Tables 12 and 13 below, and in a 5G communication system (e.g., an NR communication system), the RRC message may include one or more information elements listed in Tables 14 and 15 below. The V2X-AppliedAreaConfig in Tables 13 and 15 may indicate a resource allocation scheme to be applied to the terminal. A V2X-AppliedAreaConfig set to "ValidityArea" may indicate that a Type 1 resource allocation scheme will be used, and a V2X-AppliedAreaConfig set to "Zone" may indicate that a Type 2 resource allocation scheme will be used.

[0147] [Table 12]

[0148]

[0149]

[0150] [Table 13]

[0151]

[0152]

[0153] [Table 14]

[0154]

[0155] [Table 15]

[0156]

[0157]

[0158] The terminal can receive an RRC message from a base station and, based on an information element (e.g., V2X-AppliedAreaConfig) included in the RRC message, can identify a resource allocation scheme (e.g., type 1-resource allocation scheme or type 2-resource allocation scheme) applied to itself. When the type 1-resource allocation scheme is to be used, the terminal can identify the area to which the terminal belongs based on the current position (or, the current position and the moving direction), and can identify the side link resources (e.g., resource pool) mapped to the area (e.g., area ID) where the terminal is located based on the mapping information between the area and the side link resources (S905). When the type 2-resource allocation scheme is to be used, the terminal can identify the area to which the terminal belongs based on the current position (or, the current position and the moving direction), and can identify the side link resources (e.g., resource pool) mapped to the area (e.g., area ID) where the terminal is located based on the mapping information between the area and the side link resources (S905).

[0159] Alternatively, when the base station knows the zone or region to which the terminal belongs, in step S904, information about the side link resources mapped to the zone or region to which the terminal belongs can be received. In this case, the terminal can use the side link resources (e.g., resource pool) indicated by the RRC message received in step S904.

[0160] The terminal may perform sidelink communication (S906) using a sidelink resource (e.g., a resource pool) mapped to the area or zone to which the terminal belongs. When performing sidelink communication, the terminal may send at least one of its mobility state information, mobility state change information, location information, or a combination thereof to the base station according to a preset period.

[0161] The exemplary embodiments of the present disclosure may be implemented as program instructions that can be executed by various computers and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or a combination thereof. The program instructions recorded on the computer-readable medium may be designed and configured specifically for the present disclosure, or may be known and available to those skilled in the art of computer software.

[0162] Examples of computer-readable media may include hardware devices, such as ROM, RAM, and flash memory, which are specifically configured to store and execute program instructions. Examples of program instructions include machine code generated by, for example, a compiler, and high-level language code that can be executed by a computer using an interpreter. The above-mentioned exemplary hardware devices may be configured to operate as at least one software module to perform the embodiments of the present disclosure, and vice versa.

[0163] Although the embodiments of the present disclosure and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the disclosure.

Claims

1. A user equipment, comprising: at least one processor, The at least one processor causes the user equipment to: receiving resource pool information and region information for sidelink communication from a base station; receiving, from the base station, speed threshold information for selecting a resource allocation scheme for the sidelink communication; selecting the resource allocation scheme based on a comparison result of the speed of the user equipment and the speed threshold; Determining sidechain resources based on the selected resource allocation scheme; and The sidechain communication is performed using the determined sidechain resource.

2. The user equipment according to claim 1, wherein The resource allocation schemes are divided into type 1 resource allocation schemes and type 2 resource allocation schemes.

3. The user equipment according to claim 2, wherein: The first side chain resource determined based on the type 1 resource allocation scheme is different from the second side chain resource determined based on the type 2 resource allocation scheme.

4. The user equipment according to claim 2, wherein: When the speed of the user equipment is higher than the speed threshold, the resource allocation scheme is selected as a type 1 resource allocation scheme; when the speed of the user equipment is lower than the speed threshold, the resource allocation scheme is selected as a type 2 resource allocation scheme. The user equipment according to claim 1 , wherein: The at least one processor further causes the user equipment to: Information indicating the selected resource allocation scheme is sent to the base station. The user equipment according to claim 1 , wherein: The at least one processor further causes the user equipment to: Sending speed information of the user equipment to the base station.

7. A base station, comprising: at least one processor, The at least one processor causes the base station to: Send resource pool information and region information for side chain communication to the user equipment; Sending speed threshold information for selecting a sidelink communication resource allocation scheme to the user equipment; and Sending information about a resource allocation solution to the user equipment according to the speed threshold, The selection of the resource allocation scheme is based on a comparison result between the speed of the user equipment and the speed threshold. The base station according to claim 7 , wherein: The resource allocation schemes are divided into type 1 resource allocation schemes and type 2 resource allocation schemes.

9. The base station according to claim 8, wherein: The first sidelink resource determined based on the type 1 resource allocation scheme is different from the second sidelink resource determined based on the type 2 resource allocation scheme.

10. The base station according to claim 8, wherein: When the speed of the user equipment is higher than the speed threshold, the user equipment selects the resource allocation scheme as a type 1 resource allocation scheme; When the speed of the user equipment is lower than the speed threshold, the user equipment selects the resource allocation scheme as a type 2 resource allocation scheme.

11. The base station according to claim 8, wherein: The at least one processor further causes the base station to: Based on a comparison result of the speed of the user equipment and the speed threshold, information indicating a type 1 resource allocation scheme or a type 2 resource allocation scheme selected by the user equipment is received from the user equipment.

12. The base station according to claim 7, wherein: The at least one processor further causes the base station to: Speed information of the user equipment is received from the user equipment.

Images