Resource Allocation Method in Sidelink Communication

Abstract

Disclose a resource allocation method in sidelink communication. An operating method of a terminal includes the following steps: receiving a first message from a base station, the first message including mobility conditions for selecting a resource allocation mode for sidelink communication from the base station; selecting a resource allocation scheme applied to the terminal based on a result of comparing the mobility of the terminal and the mobility conditions; determining a resource pool based on the selected resource allocation mode; and performing sidelink communication by using the determined resource pool. Therefore, the performance of the communication system can be improved.

Description

Technical Field

[0001] The present disclosure relates to a sidelink communication technology, and more particularly to a technology for allocating sidelink resources based on the terminal speed. Background Art

[0002] The fifth generation (5G) communication system (e.g., the New Radio (NR) communication system) has been considered for handling wireless data, and the 5G communication system uses a higher frequency band than the fourth generation (4G) communication system (e.g., the Long Term Evolution (LTE) communication system or the LTE-Advanced (LTE-A) communication system) and the frequency band of the 4G communication system. The 5G communication system can support enhanced mobile broadband (eMBB) communication, ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), etc.

[0003] The 4G communication system and the 5G communication system can support vehicle-to-everything (V2X) communication. The V2X communication supported in a cellular communication system such as the 4G communication system, the 5G communication system, etc. can be referred to as "cellular-V2X (C-V2X) communication". The V2X communication (e.g., the C-V2X communication) can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc.

[0004] In a cellular communication system, the V2X communication (e.g., the C-V2X communication) can be performed based on a sidelink communication technology (e.g., the proximity service (ProSe) communication technology, the device-to-device (D2D) communication technology, etc.). For example, a sidelink channel can be established for a vehicle participating in V2V communication, and the sidelink channel can be used to perform communication between vehicles.

[0005] Meanwhile, zones can be configured, and sidelink resources (e.g., resource pools) can be configured for each of the zones. Here, the zone can be a geographical area. A terminal located in a specific zone can use the resources mapped to the specific zone to perform sidelink communication. Information about the resources mapped to a specific zone can be sent from a base station to the terminal. When the terminal moves at a high speed, the zone to which the terminal belongs may change. For example, the zone to which the terminal belongs can 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, a terminal located in zone #2 can use the resources mapped to the previous zone (i.e., zone #1) to perform sidelink communication. In this case, the performance of the sidelink communication may deteriorate, and a method for solving this problem may be required. Summary of the Invention

[0006] An object of the present disclosure for solving the above problems is to provide a method for allocating resources in sidelink communication by considering the terminal speed.

[0007] According to a first exemplary embodiment of the present disclosure, an operation method of a terminal for achieving this purpose may include: receiving a first message from a base station, the first message including mobility conditions for selecting a resource allocation scheme for sidelink communication; selecting a resource allocation scheme applied to the terminal based on a result of comparing the mobility of the terminal with the mobility conditions; determining a resource pool based on the selected resource allocation scheme; and performing sidelink communication using the determined resource pool, where the resource allocation scheme is divided into a type 1-resource allocation scheme and a type 2-resource allocation scheme, and where in the type 1-resource allocation scheme, the resource pool is configured based on a region including a plurality of zones, and in the type 2-resource allocation scheme, the resource pool is configured based on a zone.

[0008] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility conditions for applying the type 1-resource allocation scheme in the mobility conditions, the selected resource allocation scheme may be the type 1-resource allocation scheme; and when the speed of the terminal satisfies the mobility conditions for applying the type 2-resource allocation scheme in the mobility conditions, the selected resource allocation scheme may be the type 2-resource allocation scheme.

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

[0010] The first message may further include a list of one or more zones belonging to each region and a speed threshold.

[0011] The operation method may further include receiving a second message from the base station, the second message including first mapping information between a region and a resource pool and second mapping information between a zone and a resource pool, where the resource pool for sidelink communication is determined based on the first mapping information or the second mapping information.

[0012] The operation 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 region to which the terminal belongs, the determined resource pool, or a combination thereof.

[0013] According to a second exemplary embodiment of the present disclosure, an operation method of a base station for achieving this purpose may include: sending a first message to a terminal, the first message including mobility conditions for selecting a resource allocation scheme for sidelink communication; and sending a second message to the terminal, the second message including first mapping information between a region and a resource pool and second mapping information between a zone and a resource pool, each of the regions including a plurality of 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, a resource pool is configured based on a region including a plurality of zones, and in the type 2 - resource allocation scheme, a resource pool is configured based on a zone.

[0014] The operation 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 conditions.

[0015] The mobility of the terminal may be speed; when the speed of the terminal satisfies the mobility conditions for applying the type 1 - resource allocation scheme among the mobility conditions, the selected resource allocation scheme may be the type 1 - resource allocation scheme; and when the speed of the terminal satisfies the mobility conditions for applying the type 2 - resource allocation scheme among the mobility conditions, the selected resource allocation scheme may be the type 2 - resource allocation scheme.

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

[0017] According to a third exemplary embodiment of the present disclosure, an operation method of a terminal for achieving this purpose may include: sending a first message including mobility information of the terminal to the 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 conditions; determining a resource pool for sidelink communication based on the resource allocation scheme; and performing sidelink communication using the 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, a resource pool is configured based on a region including a plurality of zones, and in the type 2 - resource allocation scheme, a resource pool is configured based on a zone.

[0018] The mobility of the terminal can be speed; when the speed of the terminal meets the mobility condition for the application type 1 - resource allocation scheme in the mobility conditions, the resource allocation scheme selected by the base station can be the type 1 - resource allocation scheme; and when the speed of the terminal meets the mobility condition for the application type 2 - resource allocation scheme in the mobility conditions, the resource allocation scheme selected by the base station can be the type 2 - resource allocation scheme.

[0019] The mobility of the terminal can be speed change; when the speed change of the terminal meets the mobility condition for the application type 1 - resource allocation scheme in the mobility conditions, the resource allocation scheme selected by the base station can be the type 1 - resource allocation scheme; and when the speed change of the terminal meets the mobility condition for the application type 2 - resource allocation scheme in the mobility conditions, the resource allocation scheme selected by the base station can be the type 2 - resource allocation scheme.

[0020] The operation method may further include receiving, from the base station, first mapping information between a region and a resource pool and second mapping information between a district and a resource pool, wherein a resource pool for sidelink communication is determined based on the first mapping information or the second mapping information.

[0021] The first message may further include location information of the terminal, the first mapping information may include information about the resource pool mapped to the region corresponding to the location information, and the second mapping information may include information about the resource pool mapped to the district corresponding to the location information.

[0022] According to a fourth exemplary embodiment of the present disclosure, an operation method of a base station for achieving this purpose may include: receiving, from a terminal, a first message including mobility information of the terminal; selecting a resource allocation scheme for sidelink communication based on a result of comparing the mobility information and mobility conditions; and sending a second message including information indicating the resource allocation scheme to the terminal, 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, a resource pool is configured based on a region including a plurality of districts, and in the type 2 - resource allocation scheme, a resource pool is configured based on a district.

[0023] The mobility of the terminal can be speed; when the speed of the terminal meets the mobility condition for the application type 1 - resource allocation scheme in the mobility conditions, the selected resource allocation scheme can be the type 1 - resource allocation scheme; and when the speed of the terminal meets the mobility condition for the application type 2 - resource allocation scheme in the mobility conditions, the selected resource allocation scheme can be the type 2 - resource allocation scheme.

[0024] The mobility of the terminal can be a speed change; when the speed change of the terminal satisfies the mobility condition for the application type 1 - resource allocation scheme in the mobility conditions, the selected resource allocation scheme can be the type 1 - resource allocation scheme; and when the speed change of the terminal satisfies the mobility condition for the application type 2 - resource allocation scheme in the mobility conditions, the selected resource allocation scheme can be the type 2 - resource allocation scheme.

[0025] The operation method can further include sending first mapping information between a region and a resource pool and second mapping information between a district and a resource pool to the terminal, wherein the resource pool for sidelink communication is determined based on the first mapping information or the second mapping information.

[0026] The first message can further include the location information of the terminal, the first mapping information can include information about the resource pool mapped to the region corresponding to the location information, and the second mapping information can include information about the resource pool mapped to the district corresponding to the location information.

[0027] According to the present disclosure, a resource allocation scheme for sidelink communication can be determined based on the mobility information of the terminal (e.g., speed, speed change). In the type 1 - resource allocation scheme, sidelink resources (e.g., resource pools) of each region can be configured, while in the type 2 - resource allocation scheme, sidelink resources of each district can be configured. When the speed of the terminal is equal to or greater than a 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 district to which the terminal belongs changes within the same region, the terminal can use the same resource pool (e.g., the resource pool mapped to the region) to perform sidelink communication. Therefore, the problem of conflict between sidelink resources can be solved, and the performance of the communication system can be improved. Description of the Drawings

[0028] Figure 1 is a conceptual diagram showing a V2X communication scenario.

[0029] Figure 2 is a conceptual diagram showing an exemplary embodiment of a cellular communication system.

[0030] Figure 3 is a conceptual diagram showing an exemplary embodiment of a communication node constituting a cellular communication system.

[0031] Figure 4 is a block diagram showing an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communication.

[0032] Figure 5 is a block diagram showing a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0033] Figure 6 is a block diagram showing a second exemplary embodiment of a control plane protocol stack of a UE that performs sidelink communication.

[0034] Figure 7 is a conceptual diagram showing a first exemplary embodiment of a cell in a cellular communication system.

[0035] Figure 8 is a flowchart showing a first exemplary embodiment of a sidelink communication method according to terminal speed.

[0036] Figure 9 is a flowchart showing a second exemplary embodiment of a sidelink communication method according to terminal speed. Detailed Description

[0037] Although the present disclosure is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and are described in detail herein. However, it should be understood that the description is not intended to limit the present disclosure to the particular embodiments, but on the contrary, the present disclosure covers all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.

[0038] Although the terms "first", "second", etc. may be used herein with reference to various elements, these elements should not be construed as being limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and the second element may be referred to as the first element. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] 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.

[0040] 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 the stated features, integers, steps, operations, elements, parts and / or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or combinations thereof.

[0041] 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 so defined herein.

[0042] Hereinafter, preferred exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure, for the sake of overall understanding, throughout the description of the drawings, the same reference numerals refer to the same elements, and their repeated description will be omitted.

[0043] Figure 1 is a conceptual diagram showing a V2X communication scenario.

[0044] As Figure 1 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 the 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.

[0045] 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. V2V communication supported in the cellular communication system 140 may be performed based on "sidelink" communication technologies (e.g., ProSe and D2D communication technologies, etc.). In this case, the communication between vehicle 100 and vehicle 110 may be performed using at least one sidelink channel established between vehicle 100 and vehicle 110.

[0046] V2I communication may include communication between a first vehicle 100 (e.g., a communication node located in vehicle 100) and infrastructure located by the roadside (e.g., a roadside unit (RSU)) 120. The infrastructure 120 may also include traffic lights or street lights located by the roadside. For example, when performing V2I communication, communication may be performed between a communication node located in the first vehicle 100 and a 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. V2I communication supported in the cellular communication system 140 may also be performed based on sidelink communication technologies (e.g., ProSe and D2D communication technologies, etc.). In this case, the communication between vehicle 100 and the infrastructure 120 may be performed using at least one sidelink channel established between vehicle 100 and the infrastructure 120.

[0047] V2P communication may include communication between a first vehicle 100 (e.g., a communication node located in vehicle 100) and a person 130 (e.g., a communication node carried by person 130). The driving information of the first vehicle 100 and the 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. A communication node located in the vehicle 100 or a communication node carried by the person 130 may generate an alarm indicating danger by judging a dangerous situation based on the obtained driving information and movement information. V2P communication supported in the cellular communication system 140 may be performed based on sidelink communication technologies (e.g., ProSe and D2D communication technologies, etc.). In this case, the communication between a communication node located in the vehicle 100 and a communication node carried by the person 130 may be performed using at least one sidelink channel established between the communication nodes.

[0048] V2N communication may be communication between a first vehicle 100 (e.g., a communication node located in vehicle 100) and a server connected via a cellular communication system 140. The V2N communication may be performed based on 4G communication technologies (e.g., LTE or LTE-A) or 5G communication technologies (e.g., NR). In addition, the V2N communication may be performed based on wireless access in vehicle environment (WAVE) communication technologies or wireless local area network (WLAN) communication technologies defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11 or wireless personal area network (WPAN) communication technologies defined in IEEE 802.15.

[0049] Meanwhile, the cellular communication system 140 that supports V2X communication may be configured as follows.

[0050] Figure 2 is a conceptual diagram showing an exemplary embodiment of a cellular communication system.

[0051] As Figure 2 shown, the cellular communication system may include an access network, a core network, etc. The access network may include base stations 210, repeaters 220, user equipments (UEs) 231 to 236, etc. The UEs 231 to 236 may include communication nodes located in Figure 1 vehicles 100 and 110, communication nodes located in Figure 1 infrastructure 120, communication nodes carried by Figure 1 person 130, etc. When the cellular communication system supports 4G communication technologies, 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, etc.

[0052] When the cellular communication system supports 5G communication technologies, 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 S-GW 250, P-GW 260, and MME 270 may support both 5G communication technologies and 4G communication technologies, and the core network composed of UPF 250, SMF 260, and AMF 270 may support both 4G communication technologies and 5G communication technologies.

[0053] In addition, when the cellular communication system supports network slicing technology, the core network may be divided into multiple logical network slices. For example, network slices that support V2X communication (e.g., V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.) may be configured, and V2X communication may be supported through the V2X network slices configured in the core network.

[0054] Communication nodes (such as base stations, repeaters, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) included in a cellular communication system can perform communication by using at least one communication technology among code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiplexing (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 multicarrier (FBMC) technology, universal filtered multicarrier (UFMC) technology, and space division multiple access (SDMA) technology.

[0055] Communication nodes (such as base stations, repeaters, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) included in a cellular communication system can be configured as follows.

[0056] Figure 3 It is a conceptual diagram showing an exemplary embodiment of a communication node constituting a cellular communication system.

[0057] As Figure 3 As shown, the communication node 300 can 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 can 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.

[0058] However, each of the components included in the communication node 300 can 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 can 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.

[0059] The processor 310 can execute at least one instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 can refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor that executes the method according to the embodiments of the present disclosure. Each of the memory 320 and the storage device 360 can include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 can include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0060] Refer back to Figure 2, in a communication system, a base station 210 may form a macro cell or a small cell and may be connected to a core network via an ideal backhaul or a non-ideal backhaul. The base station 210 may send signals received from the core network to UEs 231 to 236 and a repeater 220, and may send signals received from UEs 231 to 236 and the repeater 220 to the core network. UEs 231, 232, 234, 235, and 236 may belong to the cell coverage area of the base station 210. UEs 231, 232, 234, 235, and 236 may be connected to the base station 210 by performing a connection establishment process with the base station 210. UEs 231, 232, 234, 235, and 236 may communicate with the base station 210 after being connected to the base station 210.

[0061] The repeater 220 may be connected to the base station 210 and may relay communication between the base station 210 and UEs 233 and 234. That is, the repeater 220 may send signals received from the base station 210 to UEs 233 and 234, and may send signals received from UEs 233 and 234 to the base station 210. UE 234 may belong to the cell coverage area of the base station 210 and the cell coverage area of the repeater 220, and UE 233 may belong to the cell coverage area of the repeater 220. That is, UE 233 may be located outside the cell coverage area of the base station 210. UEs 233 and 234 may be connected to the repeater 220 by performing a connection establishment process with the repeater 220. UEs 233 and 234 may communicate with the repeater 220 after being connected to the repeater 220.

[0062] The base station 210 and the repeater 220 may support multiple-input multiple-output (MIMO) technologies (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multi-point (CoMP) communication technologies, carrier aggregation (CA) communication technologies, unlicensed band communication technologies (e.g., licensed-assisted access (LAA), enhanced LAA (eLAA), etc.), sidelink communication technologies (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 repeater 220 and operations supported by the repeater 220.

[0063] 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 Transmission and Reception Point (TRP), a Radio Unit (RU), a Road Side Unit (RSU), a radio transceiver, an access point, an access node, etc. The repeater 220 may be referred to as a small base station, a relay node, etc. Each of 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 On-Board Unit (OBU), etc.

[0064] Meanwhile, the communication between UE235 and UE236 can be performed based on sidelink communication technology. The sidelink communication can be performed based on a one-to-one scheme or a one-to-many scheme. When performing V2V communication using the sidelink communication technology, UE235 can be a communication node in the first vehicle 100 located at Figure 1 and UE236 can be a communication node in the second vehicle 110 located at Figure 1 . When performing V2I communication using the sidelink communication technology, UE235 can be a communication node in the first vehicle 100 located at Figure 1 and UE236 can be a communication node in the infrastructure 120 located at Figure 1 . When performing V2P communication using the sidelink communication technology, UE235 can be a communication node in the first vehicle 100 located at Figure 1 and UE236 can be a communication node carried by the person 130 located at Figure 1 .

[0065] According to the locations of the UEs (e.g., UE235 and 236) participating in the sidelink communication, the scenarios to which the sidelink communication is applied can be classified as shown in Table 1 below. For example, Figure 2 the scenario of the sidelink communication between UE235 and UE236 shown can be the sidelink communication scenario C.

[0066] [Table 1]

[0067]

[0068] Meanwhile, the user plane protocol stack of the UEs (e.g., UE235 and 236) performing the sidelink communication can be configured as follows.

[0069] Figure 4 is a block diagram showing an exemplary embodiment of the user plane protocol stack of the UE performing the sidelink communication.

[0070] As Figure 4 shown, the left UE can be Figure 2 the UE235 shown and the right UE can be Figure 2The UE 236 shown. The scenario of sidelink communication between UE 235 and UE 236 can 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 can include a Physical (PHY) layer, a Media Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer.

[0071] The sidelink communication between UE 235 and UE 236 can be performed using a PC5 interface (e.g., PC5-U interface). Layer-2 identifiers (IDs) (e.g., source layer-2 ID, destination layer-2 ID) can be used for sidelink communication, and the layer 2-ID can be an ID configured for V2X communication (e.g., V2X service). In addition, in sidelink communication, hybrid automatic repeat request (HARQ) feedback operations can be supported, and RLC acknowledged mode (RLC AM) or RLC unacknowledged mode (RLC UM) can be supported.

[0072] Meanwhile, the control plane protocol stack of the UEs (e.g., UE 235 and 236) performing sidelink communication can be configured as follows.

[0073] Figure 5 is a block diagram showing a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication, Figure 6 is a block diagram showing a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0074] As Figure 5 and Figure 6 shown, the left UE can be Figure 2 the UE 235 shown, and the right UE can be Figure 2 the UE 236 shown. The scenario of sidelink communication between UE 235 and UE 236 can be one of the sidelink communication scenarios A to D in Table 1. Figure 5 The control plane protocol stack shown can be a control plane protocol stack for sending and receiving broadcast information (e.g., Physical Sidelink Broadcast Channel (PSBCH)).

[0075] Figure 5 The control plane protocol stack shown can include a PHY layer, a MAC layer, an RLC layer, and a Radio Resource Control (RRC) layer. The sidelink communication between UE 235 and UE 236 can be performed using a PC5 interface (e.g., PC5-C interface). Figure 6 The control plane protocol stack shown can be a control plane protocol stack for one-to-one sidelink communication. Figure 6 The control plane protocol stack shown can include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0076] Meanwhile, the channels used in the sidelink communication between UE235 and UE236 may include the Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Control Channel (PSCCH), Physical Sidelink Discovery Channel (PSDCH), and Physical Sidelink Broadcast Channel (PSBCH). The PSSCH can be used to transmit and receive sidelink data and can be configured in the UE (e.g., UE235 or 236) through higher layer signaling. The PSCCH can be used to transmit and receive sidelink control information (SCI) and can also be configured in the UE (e.g., UE235 or 236) through higher layer signaling.

[0077] The PSDCH can be used for the discovery process. For example, discovery signals can be transmitted through the PSDCH. The PSBCH can be used to transmit and receive broadcast information (e.g., system information). In addition, demodulation reference signals (DM-RS), synchronization signals, etc. can be used for the sidelink communication between UE235 and UE236. The synchronization signals can include the Primary Sidelink Synchronization Signal (PSSS) and the Secondary Sidelink Synchronization Signal (SSSS).

[0078] Meanwhile, as shown in Table 2 below, the sidelink transmission mode (TM) can be divided into sidelink TM1 to 4.

[0079] [Table 2]

[0080] Sidelink TM Description 1 Transmission using resources scheduled by the base station 2 UE autonomous transmission without base station scheduling 3 Transmission using resources scheduled by the base station in V2X communication 4 UE autonomous transmission without base station scheduling in V2X communication

[0081] When sidelink TM3 or 4 is supported, each of UE235 and 236 can use a resource pool configured by the base station 210 to perform sidelink communication. A resource pool can be configured for each of the sidelink control information and sidelink data.

[0082] The resource pool for the sidelink control information can be configured based on the RRC signaling procedure (e.g., dedicated RRC signaling procedure, broadcast RRC signaling procedure). The resource pool for receiving the sidelink control information can be configured through the broadcast RRC signaling procedure. When sidelink TM3 is supported, the resource pool for transmitting the sidelink control information can be configured through the dedicated RRC signaling procedure. In this case, the sidelink control information can be transmitted through the resources scheduled within the resource pool configured by the dedicated RRC signaling procedure by the base station 210. When sidelink TM4 is supported, the resource pool for transmitting the sidelink control information can be configured through the dedicated RRC signaling procedure or the broadcast RRC signaling procedure. In this case, the sidelink control information can be transmitted through the resources autonomously selected by the UE (e.g., UE235 or 236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0083] When side - link TM3 is supported, the resource pool for sending and receiving side - link data may not be configured. In this case, the side - link data can be sent and received through the resources scheduled by the base station 210. When side - link TM4 is supported, the resource pool for sending and receiving side - link data can be configured by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, the side - link data can be sent and received through the resources autonomously selected by the UE (e.g., UE235 or 236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0084] In the following, a side - link groupcast communication method will be described. Even when describing a method to be performed at a first communication node among communication nodes (e.g., transmission or reception of a signal), the corresponding second communication node may perform a method corresponding to the method performed at the first communication node (e.g., reception or transmission of 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 embodiments described below, the operation of a vehicle may be the operation of a communication node located in the vehicle.

[0085] Side - link signals can be synchronization signals and reference signals for side - link communication. For example, the synchronization signal can be a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Side - link Synchronization Signal (SLSS), a Primary Side - link Synchronization Signal (PSSS), a Secondary Side - link Synchronization Signal (SSSS), etc. The reference signal can be a Channel State Information Reference Signal (CSI - RS), a DM - RS, a Phase Tracking Reference Signal (PT - RS), a Cell - specific Reference Signal (CRS), a Sounding Reference Signal (SRS), a Discovery Reference Signal (DRS), etc.

[0086] Side - link channels can be a PSSCH, a PSCCH, a PSDCH, a PSBCH, a Physical Side - link Feedback Channel (PSFCH), etc. In addition, a side - link channel can refer to a side - link channel including side - link signals mapped to specific resources in the corresponding side - link channel. Side - link communication can support broadcast services, multicast services, groupcast services, and unicast services.

[0087] Meanwhile, areas for side - link communication can be configured. The area can be a geographical area. Side - link resources (e.g., resource pools) can be configured for each area. That is, the mapping relationship between the area and the side - link resources can be configured. The base station can configure the area and can configure the side - link resources mapped to each area. Alternatively, these areas can be predefined in the technical specifications. These areas can be configured as follows.

[0088] Figure 7 It is a conceptual diagram showing a first exemplary embodiment of a cell in a cellular communication system.

[0089] As Figure 7 shown, multiple cells can be configured, and a single unique reference point in the world can be configured for the multiple cells. This 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 cell can be represented based on the reference point. An area can consist of one or more cells. For example, Area #1 can include Cells #10 to #15, and Area #2 can include Cells #20 to #25. Different resources (e.g., different resource pools) can be mapped between adjacent cells. Each of Area #1 and Area #2 can be a tracking area (TA) or a valid area. Similarly, the same system information can be used within one area. The cell can have a length and a width. The cell identifier (ID) can be determined based on the length of the cell, the width of the cell, the number of cells, the reference point, the geographical coordinates of the terminal, etc. The number of cells can include the number of cells located in the first direction (e.g., the longitudinal direction) and the number of cells located in the second direction (e.g., the width direction). A modulo operation can be performed to determine the cell ID.

[0090] When a terminal is within the coverage area of a base station, the base station can send the configuration information of the cell to the terminal. The configuration information of the cell can include the length of the cell, the width of the cell, the number of cells, etc. A terminal located outside the coverage area of the base station can use the predefined configuration information of the cell (e.g., the length of the cell, the width of the cell, the number of cells, etc.) predefined in the technical specification.

[0091] Meanwhile, the base station can send the configuration information (e.g., reporting period) for reporting the geographical location information (e.g., geographical coordinates) of the terminal to the terminal. A terminal (e.g., a terminal operating in the RRC connected state within the coverage area of the base station) can receive the configuration information for geographical location information reporting from the base station, and based on this configuration information, can report its current geographical location information to the base station. The geographical location information of the terminal can be sent according to a preset period.

[0092] The base station can receive the geographical location information from the terminal, and can identify the cell to which the terminal belongs based on this geographical location information. The base station can send system information (e.g., System Information Block (SIB) 21), which includes information about the resources (e.g., resource pool) mapped to the cell to which the terminal belongs. The terminal can receive the system information from the base station, and can identify the information about the resources mapped to the cell to which the terminal belongs based on the system information. The terminal can use the resources (e.g., resource pool) indicated by the system information to perform sidelink communication.

[0093] A terminal located outside the coverage area of a base station can identify resources (e.g., resource pools) mapped to the area to which the terminal belongs based on the mapping relationship between areas and resources defined in the technical specification. The terminal can use the identified resources to perform sidelink communication.

[0094] Meanwhile, when the terminal is moving at high speed, the terminal may not know the information about the resources mapped to the area to which it belongs when performing sidelink communication. For example, a terminal located in area #14 can perform sidelink communication based on the information about resources (e.g., the resource pool mapped to area #14) received from the base station, and then, can move to area #12. Since the geographical location information of the terminal is reported to the base station periodically, even if the terminal is located in area #12, it may not be able to report its geographical location information (i.e., the changed geographical location information) to the base station before the next reporting period. In this case, since the terminal cannot obtain the information about the resources mapped to area #12 from the base station, the terminal can use the resources mapped to the previous area (i.e., area #14) to perform sidelink communication in area #12. For this reason, conflicts between sidelink resources may occur, and the performance of sidelink communication may deteriorate.

[0095] To solve such problems, the resource allocation scheme can vary according to the speed of the terminal. The resource allocation scheme can be divided into a type 1 - resource allocation scheme and a type 2 - resource allocation scheme.

[0096] The type 1 - resource allocation scheme can be a scheme for allocating sidelink resources (e.g., resource pools) based on regions. A region can include multiple areas. For example, Figure 7 the shown region #1 can include areas #10 to #15, Figure 7 the shown region #2 can include areas #20 to #25. When using the type 1 - resource allocation scheme, different sidelink resources can be configured for each region, and the same sidelink resources can be configured for the areas belonging to the same region. The terminal can use the sidelink resources mapped to the region where the terminal is located. In Figure 7 the shown exemplary embodiment, even when the area where the terminal is located changes from area #14 to area #12, since the region to which the terminal belongs does not change from region #1, the terminal can use the same sidelink resources despite the area change.

[0097] The type 2 - resource allocation scheme can be a scheme for allocating sidelink resources (e.g., resource pools) based on areas. When using the type 2 - resource allocation scheme, different sidelink resources can be configured for each area. The terminal can use the sidelink resources mapped to the area where the terminal is located. The sidelink communication based on the type 1 - resource allocation scheme or the type 2 - resource allocation scheme can be performed as follows.

[0098] Figure 8It is a flowchart showing a first exemplary embodiment of a sidelink communication method according to terminal speed.

[0099] As Figure 8 shown, the communication system may include a base station and a terminal. The base station may be Figure 2 the base station 210 shown, and the terminal may be Figure 2 the UE235 or UE236 shown. The base station and the terminal may be configured the same as or similar to the Figure 3 communication node 300 shown. The terminal may support the Figures 4 to 6 protocol stack shown. The terminal may be connected to the base station and may perform sidelink communication based on the scheduling of the base station. Alternatively, the terminal may be outside the coverage area of the base station and may perform sidelink communication without base station scheduling.

[0100] The base station may generate system information (e.g., SIB1, SIB21, or SIB26), and the system information includes 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 mobility conditions (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) to be applied to the terminal. The mobility conditions 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".

[0101] [Table 3]

[0102]

[0103] The mobility state (i.e., speed) of the terminal may 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, type 1 - mobility state may be high speed, and type 2 - mobility state may be low speed. In this case, a speed threshold may be configured, and a speed equal to or greater than the speed threshold may be determined as high speed, and a speed less than the speed threshold may be determined as low speed. In addition, type 1 - mobility state change may be "low speed → high speed", and type 2 - mobility state change may be "high speed → low speed".

[0104] When the mobility state is divided into three states, the type 1 - mobility state can be high speed, and the type 2 - mobility state can be medium speed and 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. Additionally, the type 1 - mobility state change can be "low speed → high speed" or "medium speed → high speed", and the 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 (e.g., two measurement points) pre - configured by the base station. Information about the pre - configured measurement period (e.g., two measurement points) can be included in the system information sent in step S801.

[0105] Alternatively, when the mobility state is divided into three states, the type 1 - mobility state can be high speed and medium speed, and the type 2 - mobility state 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. Additionally, the type 1 - mobility state change can be "low speed → medium speed", "low speed → high speed", or "medium speed → high speed", and the type 2 - mobility state change can be "high speed → low speed" or "medium speed → low speed".

[0106] System information (e.g., SI - SchedulingInfo in the system information) including one or more information elements described in Table 3 can be configured as shown in Tables 4 to 6 below. In Table 4, ListofZoneIDsAssociatedwithAreaID (list of zone IDs associated with the area ID) may be a list of zone IDs, AreaApplyState (area application state) may be the type 1 - mobility state, ZoneApplyState (zone application state) may be the type 2 - mobility state, AreaApplyStateTransition (area application state transition) may be the type 1 - mobility state change, ZoneApplyStateTransition (zone application state transition) may be the type 2 - mobility state change, and SpeedThreshold may be the speed threshold.

[0107] [Table 4]

[0108]

[0109] [Table 5]

[0110]

[0111]

[0112] [Table 6]

[0113]

[0114] The terminal can receive system information from the base station and can identify the information elements included in the system information (e.g., the information elements listed in Table 3). For example, the terminal can determine its mobility state (e.g., high speed, medium speed, or low speed), and can select a resource allocation scheme to be used (e.g., type 1 - resource allocation scheme or type 2 - resource allocation scheme) based on the mobility state (S802). When the mobility state of the terminal is type 1 - mobility state, the terminal can 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 can determine that the type 2 - resource allocation scheme will be used for sidelink communication.

[0115] Alternatively, the terminal can 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 can select a resource allocation scheme (e.g., type 1 - resource allocation scheme or type 2 - resource allocation scheme) based on the change in mobility state (S802). When the change in the mobility state of the terminal is type 1 - change in mobility state, the terminal can determine that the type 1 - resource allocation scheme will be used for sidelink communication. When the change in the mobility state of the terminal is type 2 - change in mobility state, the terminal can determine that the type 2 - resource allocation scheme will be used for sidelink communication.

[0116] Meanwhile, the base station can configure sidelink resources (e.g., a resource pool) for each area and configure sidelink resources (e.g., a resource pool) for each region. In the type 1 - resource allocation scheme, the sidelink resources of each region can be configured differently, the sidelink resources of the areas belonging to the same region can be the same, and the sidelink resources of the areas belonging to different regions can be different. In the type 2 - resource allocation scheme, the sidelink resources of each area can be configured differently.

[0117] The base station can send system information (e.g., SIB1, SIB21, SIB26) including "mapping information between zones and sidelink resources" and / or "mapping information between regions and sidelink resources" to the terminal (S803). The mapping information between zones and sidelink resources can include the ID of the zone (e.g., zone ID), information about the sidelink resources mapped to the zone, etc. The mapping information between regions and sidelink resources can include the ID of the region (e.g., region ID), a list of zones belonging to the region, information about the sidelink resources mapped to the region, etc. The terminal can identify the mapping information between zones and sidelink resources and / or the mapping information between regions and sidelink resources by receiving the system information from the base station.

[0118] In step S801, the mapping information between zones and sidelink resources and / or the mapping information between regions and sidelink resources can be sent. In this case, the terminal can perform step S802 after identifying the mapping information between zones and sidelink resources and / or the mapping information between regions and sidelink resources included in the system information.

[0119] When the 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 the type 2 - resource allocation scheme is selected in step S802, the terminal can identify the zone to which the terminal belongs, and identify the sidelink resources (e.g., resource pool) mapped to the zone to which the terminal belongs based on the system information (S804).

[0120] In addition, the terminal can generate a message including one or more information elements shown in Table 7 below, and can send the generated message to the base station (S805). Step S805 can be selectively executed. The message sent in step S805 can be sidelink UE information or UE assistance information. The base station can identify one or more information elements listed in Table 7 below by receiving the message from the terminal.

[0121] [Table 7]

[0122]

[0123] The terminal can perform sidelink communication using the sidelink resources (e.g., resource pool) mapped to the region or zone to which the terminal belongs (S806). When performing sidelink communication, the terminal can notify its geographical location information to the base station according to a preset period.

[0124] Figure 9 It is a flowchart showing a second exemplary embodiment of the sidelink communication method according to the terminal speed.

[0125] As Figure 9As shown, the communication system may include a base station and a terminal. The base station may be Figure 2 the base station 210 shown, and the terminal may be Figure 2 the UE235 or UE236 shown. The base station and the terminal may be configured the same as or similarly to Figure 3 the communication node 300 shown. The terminal may support Figures 4 to 6 the protocol stack shown. The terminal may be connected to the base station and may perform sidelink communication based on the scheduling of the base station. Alternatively, the terminal may be outside the coverage area of the base station and may perform sidelink communication without scheduling the base station.

[0126] The base station may send system information (e.g., SIB1, SIB21, SIB26) to the terminal, and the system information includes mapping information between a zone and sidelink resources and / or mapping information between a region and sidelink resources (S901). The mapping information between the zone and sidelink resources and / or the mapping information between the region and sidelink resources may be sent via an RRC connection reconfiguration message instead of system information. Alternatively, the mapping information between the zone and sidelink resources and / or the mapping information between the region and sidelink resources may be sent in step S904.

[0127] The mapping information between the zone and sidelink resources may include an identifier of the zone (e.g., zone ID), information about the sidelink resources mapped to the zone, etc. The mapping information between the region and sidelink resources may include an identifier of the region (e.g., region ID), a list of zones belonging to the region, information about the sidelink resources mapped to the region, etc. The terminal may identify the mapping information between the zone and sidelink resources and / or the mapping information between the region and sidelink resources by receiving system information from the base station.

[0128] 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 further include the location information of the terminal. The location information of the terminal may include at least one of a geographical location, a movement path, a movement direction, or a combination thereof. The measurement report message may be sent according to a preset period. The measurement report message may be sidelink UE information or UE assistance information.

[0129] 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 speed, medium speed, or low speed. When the speed of the terminal is divided into two speeds (e.g., high speed or low speed), the mobility state information may indicate high speed or low speed. When the speed of the terminal is divided into three speeds (e.g., high speed, medium speed, or low speed), the mobility state information may indicate high speed, medium speed, or low speed.

[0130] A mobility state change can be a change in the speed of a terminal. When a speed threshold and a measurement period (e.g., a measurement point) are pre-configured by a base station, the terminal can 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 can 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 can 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".

[0131] The measurement report message can include one or more information elements listed in Tables 8 to 11 below. MobilityState in Table 9 can be mobility state information, and MobilityStateTransition in Table 9 can be mobility state change information.

[0132] [Table 8]

[0133]

[0134]

[0135] [Table 9]

[0136]

[0137]

[0138] [Table 10]

[0139]

[0140] [Table 11]

[0141]

[0142]

[0143] The base station can receive a measurement report message from the terminal, and based on the mobility status information or mobility status change information included in the measurement report message, it can select a resource allocation scheme to be applied to the terminal (e.g., a type 1 - resource allocation scheme or a type 2 - resource allocation scheme). 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 can 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 can determine that the type 2 - resource allocation scheme will be applied to the terminal.

[0144] The base station can generate an RRC message including information indicating the resource allocation scheme to be applied to the terminal, and can send the RRC message to the terminal (S904). The RRC message can be an RRC connection reconfiguration message. The RRC message can also include mapping information between zones and sidelink resources and / or mapping information between regions and sidelink resources. The base station knowing the location information of the terminal (e.g., geographical location, moving direction) can estimate the zone or region to which the terminal belongs. Therefore, the RRC message sent in step S904 can include information about the sidelink resources mapped to the zone to which the terminal belongs, or information about the sidelink resources mapped to the region to which the terminal belongs.

[0145] In a 4G communication system (e.g., an LTE communication system), the RRC message can 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 can include one or more information elements listed in Tables 14 and 15 below. V2X - AppliedAreaConfig in Tables 13 and 15 can indicate the resource allocation scheme to be applied to the terminal. V2X - AppliedAreaConfig set to "ValidityArea" can indicate that the type 1 - resource allocation scheme will be used, and V2X - AppliedAreaConfig set to "Zone" can indicate that the type 2 - resource allocation scheme will be used.

[0146] [Table 12]

[0147]

[0148]

[0149] [Table 13]

[0150]

[0151] [Table 14]

[0152]

[0153]

[0154] [Table 15]

[0155]

[0156] The terminal can receive RRC messages from the base station, and based on the information elements included in the RRC messages (e.g., V2X-AppliedAreaConfig), can identify the resource allocation scheme applied to itself (e.g., type 1-resource allocation scheme or type 2-resource allocation scheme). When the type 1-resource allocation scheme will be used, the terminal can identify the area to which the terminal belongs based on the current location (or, the current location and the moving direction), and can identify the sidelink resources (e.g., resource pool) mapped to the area where the terminal is located (e.g., area ID) based on the mapping information between the area and the sidelink resources (S905). When the type 2-resource allocation scheme will be used, the terminal can identify the zone to which the terminal belongs based on the current location (or, the current location and the moving direction), and can identify the sidelink resources (e.g., resource pool) mapped to the zone where the terminal is located (e.g., zone ID) based on the mapping information between the zone and the sidelink resources (S905).

[0157] Alternatively, when the base station knows the zone or area to which the terminal belongs, in step S904, it can receive information about the sidelink resources mapped to the zone or area to which the terminal belongs. In this case, the terminal can use the sidelink resources (e.g., resource pool) indicated by the RRC message received in step S904.

[0158] The terminal can perform sidelink communication using the sidelink resources (e.g., resource pool) mapped to the area or zone to which the terminal belongs (S906). When performing sidelink communication, the terminal can send at least one of its mobility status information, mobility status change information, location information, or a combination thereof to the base station according to a preset period.

[0159] Exemplary embodiments of the present disclosure can be implemented as program instructions executable by various computers and recorded on a computer-readable medium. The computer-readable medium can include program instructions, data files, data structures, or a combination thereof. The program instructions recorded on the computer-readable medium can be designed and configured specifically for the present disclosure, or can be known and available to those skilled in the art of computer software.

[0160] Examples of computer-readable media can 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 foregoing exemplary hardware devices can be configured to operate as at least one software module to execute embodiments of the present disclosure, and vice versa.

[0161] Although embodiments of the present disclosure and their 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 present disclosure.

Claims

1. An operating method for a terminal in a communication system, the operating method comprising: Receiving a first message from a base station, the first message including a speed threshold for selecting a resource allocation scheme for sidelink communication; Selecting a resource allocation scheme based on a result of comparing the speed of the terminal with the speed threshold; Determining sidelink resources based on the selected resource allocation scheme; And Performing the sidelink communication using the determined sidelink resources, Wherein the resource allocation scheme is divided into a type 1 - resource allocation scheme and a type 2 - resource allocation scheme, Wherein a first sidelink resource determined based on the type 1 - resource allocation scheme is different from a second sidelink resource determined based on the type 2 - resource allocation scheme, and Wherein, when the speed of the terminal is higher than the speed threshold, the selected resource allocation scheme is the type 1 - resource allocation scheme, and when the speed of the terminal is lower than the speed threshold, the selected resource allocation scheme is the type 2 - resource allocation scheme.

2. The operating method according to claim 1, further comprising sending a third message to the base station, the third message including information indicating the selected resource allocation scheme.

3. An operating method for a base station in a communication system, the operating method comprising: Sending a first message to a terminal, the first message including a speed threshold for selecting a resource allocation scheme for sidelink communication; And Sending a second message of a resource allocation scheme according to the speed threshold to the terminal, Wherein the resource allocation scheme is divided into a type 1 - resource allocation scheme and a type 2 - resource allocation scheme, wherein a first sidelink resource determined based on the type 1 - resource allocation scheme is different from a second sidelink resource determined based on the type 2 - resource allocation scheme, and Wherein, when the speed of the terminal is greater than the speed threshold, the terminal selects the type 1 - resource allocation scheme, and when the speed of the terminal is less than the speed threshold, the terminal selects the type 2 - resource allocation scheme.

4. The operating method according to claim 3, further comprising receiving a third message from the terminal, the third message including information indicating the type 1 - resource allocation scheme or the type 2 - resource allocation scheme selected by the terminal based on a result of comparing the speed of the terminal with the speed threshold.

5. An operating method for a terminal in a communication system, the operating method comprising: Sending a first message including the speed 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 speed of the terminal with the speed threshold; Determining sidelink resources for sidelink communication based on the resource allocation scheme; And Performing the sidelink communication using the sidelink resources, Wherein the resource allocation scheme is divided into a type 1 - resource allocation scheme and a type 2 - resource allocation scheme, wherein a first sidelink resource determined based on the type 1 - resource allocation scheme is different from a second sidelink resource determined based on the type 2 - resource allocation scheme; and Among them, when the speed of the terminal is higher than the speed threshold, the selected resource allocation scheme is a type 1-resource allocation scheme, and when the speed of the terminal is lower than the speed threshold, the selected resource allocation scheme is a type 2-resource allocation scheme.

6. The operating method according to claim 5, wherein the first message further includes location information of the terminal.

7. An operating method of a base station in a communication system, the operating method comprising: Receiving a first message including the speed of the terminal from the terminal; Selecting a resource allocation scheme for sidelink communication based on a result of comparing the speed of the terminal with a speed threshold; And Sending a second message including information indicating the resource allocation scheme to the terminal, wherein the resource allocation scheme is divided into a type 1-resource allocation scheme and a type 2-resource allocation scheme, wherein a first sidelink resource determined based on the type 1-resource allocation scheme is different from a second sidelink resource determined based on the type 2-resource allocation scheme; and wherein when the speed of the terminal is higher than the speed threshold, the selected resource allocation scheme is a type 1-resource allocation scheme, and when the speed of the terminal is lower than the speed threshold, the selected resource allocation scheme is a type 2-resource allocation scheme.

8. The operating method according to claim 7, wherein the first message further includes location information of the terminal.

Images