KR20210023711A - Method for configuring sidelink resources in communication system - Google Patents

Abstract

A method for configuring sidelink resources in a communication system is disclosed. An operation method of a first terminal includes the steps of: generating SCI including a time aggregation level indicating n time intervals, time resource allocation information indicating time resources used for transmission of data within the n time intervals, and frequency resource allocation information; transmitting the SCI to a second terminal; and transmitting, to the second terminal, the data in a PSSCH consisting of the time resources and frequency resources indicated by the frequency resource allocation information. Therefore, the performance of the communication system can be improved.

Description

How to set sidelink resources in communication system {METHOD FOR CONFIGURING SIDELINK RESOURCES IN COMMUNICATION SYSTEM}

The present invention relates to a sidelink communication technology, and more particularly, to a technology for setting sidelink resources in a communication system.

4G (4th Generation) communication system (e.g., LTE (Long Term Evolution) communication system, LTE-A (Advanced) communication system) to process the rapidly increasing radio data after the commercialization of the frequency band of the 4G communication system ( For example, 5G (5th Generation) communication systems (e.g., NR (New Radio) communication system) is being considered. The 5G communication system may support enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and Massive Machine Type Communication (mMTC).

The 4G communication system and the 5G communication system may support vehicle to everything (V2X) communication (eg, sidelink communication). V2X communication supported in a cellular communication system such as a 4G communication system and a 5G communication system may be referred to as “Cellular-Vehicle to Everything (C-V2X) communication”. V2X communication (e.g., C-V2X communication) may include V2V (Vehicle to Vehicle) communication, V2I (Vehicle to Infrastructure) communication, V2P (Vehicle to Pedestrian) communication, V2N (Vehicle to Network) communication, etc. .

In a cellular communication system, V2X communication (e.g., C-V2X communication) is based on a sidelink communication technology (e.g., ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology). Can be done. For example, a sidelink channel for vehicles participating in V2V communication (eg, sidelink communication) may be established, and communication between vehicles may be performed using a sidelink channel. Sidelink communication may be performed using CG (configured grant) resources. CG resources may be set periodically, and periodic data (eg, periodic sidelink data) may be transmitted using CG resources.

Meanwhile, sidelink data may be transmitted periodically or aperiodically. Sidelink data may be transmitted in a unicast method, a multicast method, a groupcast method, or a broadcast method. The size of the sidelink data may vary according to the characteristics of the communication service. There is a need for a method of allocating sidelink resources (eg, a setting method) for efficiently transmitting the above-described sidelink data.

An object of the present invention to solve the above problems is to provide a method of setting sidelink resources for data transmission in a communication system.

The operation method of the first terminal according to the first embodiment of the present invention for achieving the above object includes a time aggregation level indicating n time intervals, a time used for transmission of data within the n time intervals. Generating an SCI including time resource allocation information indicating resources and frequency resource allocation information, transmitting the SCI to a second terminal, and a frequency indicated by the time resources and the frequency resource allocation information And transmitting the data to the second terminal in a PSSCH composed of resources, wherein n is a natural number of 1 or more.

Here, a plurality of temporal aggregation levels may be set by higher layer signaling, and the temporal aggregation level included in the SCI may be one of the plurality of temporal aggregation levels.

Here, the time resource allocation information may include at least one of an index of a start symbol of the time resources and information indicating the length of the time resources.

Here, the frequency resource allocation information may include one or more of an index of a starting RB of the frequency resources and information indicating the number of RBs constituting the frequency resources.

Here, a time offset may exist between the n time intervals in the time domain, and the time offset may be set by higher layer signaling.

Here, the SCI may further include a frequency aggregation level indicating p frequency bands, the frequency resources may be located within the p frequency bands, and p may be a natural number of 1 or more.

Here, a plurality of frequency aggregation levels may be set by higher layer signaling, and the frequency aggregation level included in the SCI may be one of the plurality of frequency aggregation levels.

Here, a frequency offset may exist between the p frequency bands in the frequency domain, and the frequency offset may be set by higher layer signaling.

Here, each of the n time intervals may be one slot, and the frequency resources may be an RB set.

Here, the SCI may further include information indicating a retransmission method of the data, and the retransmission method may be a chase combining method or an IR method.

In order to achieve the above object, a method of operating a first terminal according to a second embodiment of the present invention includes time resource allocation information, a frequency aggregation level indicating p frequency bands, and data within the p frequency bands. Generating an SCI including frequency resource allocation information indicating frequency resources used for transmission, transmitting the SCI to a second terminal, and a time indicated by the frequency resources and the time resource allocation information And transmitting the data to the second terminal in a PSSCH composed of resources, wherein p is a natural number of 1 or more.

Here, a plurality of frequency aggregation levels may be set by higher layer signaling, and the frequency aggregation level included in the SCI may be one of the plurality of frequency aggregation levels.

Here, a frequency offset may exist between the p frequency bands in the frequency domain, and the frequency offset may be set by higher layer signaling.

Here, the frequency resource allocation information may include one or more of an index of a starting RB of the frequency resources and information indicating the number of RBs constituting the frequency resources.

In order to achieve the above object, a method of operating a first terminal according to a third embodiment of the present invention includes receiving a higher layer message including a time aggregation level indicating n time intervals from a base station, the time aggregation level Generating an SCI including time resource allocation information and frequency resource allocation information indicating time resources used for data transmission within the n time intervals indicated by, and transmitting the SCI to a second terminal And transmitting the data to the second terminal in a PSSCH composed of the time resources and frequency resources indicated by the frequency resource allocation information, wherein n is a natural number of 1 or more.

Here, the higher layer message may further include a frequency aggregation level indicating p frequency bands, the frequency resources may be located in the p frequency bands, and p may be a natural number of 1 or more.

Here, the time aggregation level and the frequency aggregation level may be set for each resource pool, and configuration information of the resource pool may be included in the higher layer message.

Here, the upper layer message may further include at least one of an index of a start symbol of the time resources, information indicating the length of the time resources, and a time offset between the n time periods.

Here, the upper layer message may include at least one of an index of a start RB of the frequency resources, information indicating the number of RBs constituting the frequency resources, and a frequency offset between the p frequency bands.

Here, the upper layer message may further include information indicating a retransmission method of the data, and the retransmission method may be a chase combining method or an IR method.

According to the present invention, one control information is an information element indicating a plurality of time periods (eg, aggregated time periods) and/or a plurality of frequency bands (eg, aggregated frequency bands). (S) may be included. Data may be transmitted using sidelink resources indicated by one piece of control information. That is, since a plurality of time intervals and/or a plurality of frequency bands may be used according to the size of data to be transmitted, the efficiency of using sidelink resources may be improved, and performance of sidelink communication may be improved.

1 is a conceptual diagram illustrating scenarios of V2X communication.
2 is a conceptual diagram showing a first embodiment of a cellular communication system.
3 is a block diagram showing a first embodiment of a communication node constituting a cellular communication system.
4 is a block diagram showing a first embodiment of a user plane protocol stack of a UE performing sidelink communication.
5 is a block diagram showing a first embodiment of a control plane protocol stack of a UE performing sidelink communication.
6 is a block diagram showing a second embodiment of a control plane protocol stack of a UE performing sidelink communication.
7 is a conceptual diagram illustrating a first embodiment of a method for allocating a sidelink resource when the time aggregation level is 1 in a communication system.
8 is a conceptual diagram illustrating a first embodiment of a method for allocating a sidelink resource when the time aggregation level is 2 in a communication system.
9 is a conceptual diagram illustrating a first embodiment of a method for allocating a sidelink resource when the time aggregation level is 3 in a communication system.
10 is a conceptual diagram illustrating a first embodiment of a method of allocating a sidelink resource when the frequency aggregation level is 1 in a communication system.
11 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the frequency aggregation level is 2 in a communication system.
12 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the frequency aggregation level is 3 in a communication system.
13 is a conceptual diagram illustrating a first embodiment of a sidelink resource allocation method when the time aggregation level is 3 and the frequency aggregation level is 2 in a communication system.
14 is a flowchart illustrating a first embodiment of a method of setting sidelink resources in a communication system.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term “and/or” includes a combination of a plurality of related stated items or any of a plurality of related stated items.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate an overall understanding, the same reference numerals are used for the same elements in the drawings, and duplicate descriptions for the same elements are omitted.

1 is a conceptual diagram showing scenarios of V2X (Vehicle to Everything) communication.

Referring to FIG. 1, V2X communication may include vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) communication, and vehicle to network (V2N) communication. V2X communication may be supported by a cellular communication system (eg, a cellular communication network) 140, and V2X communication supported by the cellular communication system 140 is "C-V2X (Cellular-Vehicle to Everything) communication May be referred to as ". The cellular communication system 140 includes a 4G (4th Generation) communication system (e.g., a Long Term Evolution (LTE) communication system, an LTE-A (Advanced) communication system), a 5G (5th Generation) communication system (e.g., NR (New Radio) communication system), and the like.

V2V communication is communication between vehicle #1 (100) (for example, a communication node located in vehicle #1 (100)) and vehicle #2 (110) (for example, a communication node located in vehicle #1 (100)). Can mean Driving information (eg, velocity, heading, time, position, etc.) may be exchanged between the vehicles 100 and 110 through V2V communication. Autonomous driving (eg, platooning) may be supported based on driving information exchanged through V2V communication. V2V communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, Proximity based Services (ProSe) communication technology, Device to Device (D2D) communication technology). . In this case, communication between the vehicles 100 and 110 may be performed using a sidelink channel.

V2I communication may mean communication between vehicle #1 100 and an infrastructure (eg, road side unit (RSU)) 120 located on the roadside. The infrastructure 120 may be a traffic light or a street light located on a roadside. For example, when V2I communication is performed, communication may be performed between a communication node located at the vehicle #1 100 and a communication node located at a traffic light. Driving information, traffic information, and the like may be exchanged between the vehicle #1 100 and the infrastructure 120 through V2I communication. V2I communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, ProSe communication technology, D2D communication technology). In this case, communication between the vehicle #1 100 and the infrastructure 120 may be performed using a sidelink channel.

V2P communication means communication between vehicle #1 (100) (for example, a communication node located in vehicle #1 (100)) and a person 130 (for example, a communication node possessed by the person 130). I can. Exchanging driving information of vehicle #1 (100) and movement information of person 130 (for example, speed, direction, time, location, etc.) between vehicle #1 (100) and person (130) through V2P communication The communication node located in the vehicle #1 100 or the communication node possessed by the person 130 may generate an alarm indicating a danger by determining a danger situation based on the acquired driving information and movement information. . V2P communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, ProSe communication technology, D2D communication technology). In this case, communication between a communication node located in the vehicle #1 100 or a communication node possessed by the person 130 may be performed using a sidelink channel.

V2N communication may mean communication between vehicle #1 (100) (eg, a communication node located in vehicle #1 (100)) and a cellular communication system (eg, a cellular communication network) 140. V2N communication can be performed based on 4G communication technology (e.g., LTE communication technology and LTE-A communication technology specified in 3GPP standard), 5G communication technology (e.g., NR communication technology specified in 3GPP standard), etc. have. In addition, V2N communication is a communication technology specified in the IEEE (Institute of Electrical and Electronics Engineers) 702.11 standard (e.g., WAVE (Wireless Access in Vehicular Environments) communication technology, WLAN (Wireless Local Area Network) communication technology, etc.), IEEE It can be performed based on the communication technology (eg, WPAN (Wireless Personal Area Network), etc.) specified in the 702.15 standard.

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

2 is a conceptual diagram showing a first embodiment of a cellular communication system.

Referring to FIG. 2, the cellular communication system may include an access network, a core network, and the like. The access network may include a base station 210, a relay 220, a user equipment (UE) 231 to 236, and the like. The UEs 231 to 236 may be a communication node located in the vehicles 100 and 110 of FIG. 1, a communication node located in the infrastructure 120 of FIG. 1, a communication node possessed by the person 130 of FIG. 1, and the like. When the cellular communication system supports 4G communication technology, the core network is a serving-gateway (S-GW) 250, a packet data network (PDN)-gateway (P-GW) 260, and a mobility management entity (MME). (270) and the like.

When the cellular communication system supports 5G communication technology, the core network includes a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, and the like. I can. Alternatively, when NSA (Non-StandAlone) is supported in a cellular communication system, the core network composed of S-GW 250, P-GW 260, MME 270, etc. is not only 4G communication technology but also 5G communication technology. Also, the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support not only 5G communication technology but also 4G communication technology.

In addition, when the cellular communication system supports a network slicing technique, the core network may be divided into a plurality of logical network slices. For example, a network slice supporting V2X communication (e.g., V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.) can be set, and V2X communication is performed on the V2X network slice set in the core network. Can be supported by

Communication nodes constituting a cellular communication system (e.g., base stations, relays, UEs, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) are CDMA (code division multiple access) technology, WCDMA (wideband) 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 (SC) technology -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 space division multiple access (SDMA) ) Communication may be performed using at least one communication technology among the technologies.

Communication nodes (eg, base station, relay, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) constituting the cellular communication system may be configured as follows.

3 is a block diagram showing a first embodiment of a communication node constituting a cellular communication system.

Referring to FIG. 3, the communication node 300 may include at least one processor 310, a memory 320, and a transmission/reception device 330 connected to a network to perform communication. In addition, the communication node 300 may further include an input interface device 340, an output interface device 350, and a storage device 360. Each of the components included in the communication node 300 may be connected by a bus 370 to communicate with each other.

However, each of the components included in the communication node 300 may be connected through an individual interface or an individual bus based on the processor 310 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 through a dedicated interface. .

The processor 310 may execute a program command stored in at least one of the memory 320 and the storage device 360. The processor 310 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which methods according to embodiments of the present invention are performed. Each of the memory 320 and the storage device 360 may be configured with at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 320 may be composed of at least one of read only memory (ROM) and random access memory (RAM).

Referring back to FIG. 2, in the communication system, the base station 210 may form a macro cell or a small cell, and may be connected to a core network through 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. . UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) may belong to the cell coverage of the base station 210 (cell coverage). UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) can be connected to the base station 210 by performing a connection establishment procedure with the base station 210 . UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) may perform communication with the base station 210 after being connected to the base station 210.

The relay 220 may be connected to the base station 210 and may relay communication between the base station 210 and the UEs #3 and #4 233 and 234. The relay 220 may transmit a signal received from the base station 210 to the UE #3 and #4 (233, 234), and the signal received from the UE #3 and #4 (233, 234) is transmitted to the base station 210 Can be transferred to. UE #4 234 may belong to the cell coverage of the base station 210 and the cell coverage of the relay 220, and the UE #3 233 may belong to the cell coverage of the relay 220. That is, UE #3 233 may be located outside the cell coverage of the base station 210. UE #3 and #4 (233, 234) may be connected to the relay 220 by performing a connection establishment procedure with the relay 220. UEs #3 and #4 233 and 234 may communicate with the relay 220 after being connected to the relay 220.

The base station 210 and the relay 220 are MIMO (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.) communication technology, coordinated multipoint (CoMP) communication technology, CA (Carrier Aggregation) 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. UE #1, #2, #5, and #6 (231, 232, 235, 236) may perform an operation corresponding to the base station 210, an operation supported by the base station 210, and the like. UE #3 and #4 (233, 234) may perform an operation corresponding to the relay 220, an operation supported by the relay 220, and the like.

Here, the base station 210 is a NodeB (NodeB), an advanced NodeB (evolved NodeB), a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), and an RSU ( road side unit), a radio transceiver, an access point, an access node, and the like. The relay 220 may be referred to as a small base station, a relay node, or the like. The UEs 231 to 236 include a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, and a portable subscriber station. It may be referred to as a subscriber station, a node, a device, an on-broad unit (OBU), and the like.

On the other hand, communication between UE #5 235 and UE #6 236 may be performed based on a cycle link communication technology (eg, ProSe communication technology, D2D communication technology). Sidelink communication may be performed based on a one-to-one method or a one-to-many method. When V2V communication is performed using a cycle link communication technology, UE #5 235 may indicate a communication node located in vehicle #1 100 of FIG. 1, and UE #6 236 of FIG. It is possible to indicate a communication node located in vehicle #2 (110). When V2I communication is performed using a cycle link communication technology, UE #5 235 may indicate a communication node located in vehicle #1 100 of FIG. 1, and UE #6 236 of FIG. A communication node located in the infrastructure 120 may be indicated. When V2P communication is performed using a cycle link communication technology, UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) of FIG. The communication node possessed by the person 130 may be indicated.

Scenarios to which sidelink communication is applied may be classified as shown in Table 1 below according to the location of UEs (eg, UE #5 235, UE #6 236) participating in the sidelink communication. For example, a scenario for sidelink communication between UE #5 235 and UE #6 236 shown in FIG. 2 may be sidelink communication scenario #C.

Meanwhile, a user plane protocol stack of UEs (eg, UE #5 235, UE #6 236) performing sidelink communication may be configured as follows.

4 is a block diagram showing a first embodiment of a user plane protocol stack of a UE performing sidelink communication.

Referring to FIG. 4, UE #5 235 may be UE #5 235 shown in FIG. 2, and UE #6 236 may be UE #6 236 shown in FIG. 2. A scenario for sidelink communication between UE #5 235 and UE #6 236 may be one of sidelink communication scenarios #A to #D in Table 1. UE #5 (235) and UE #6 (236) each of the user plane protocol stack is PHY (Physical) layer, MAC (Medium Access Control) layer, RLC (Radio Link Control) layer, PDCP (Packet Data Convergence Protocol) layer And the like.

Sidelink communication between UE #5 235 and UE #6 236 may be performed using a PC5 interface (eg, a PC5-U interface). Layer 2-ID (identifier) (e.g., source layer 2-ID, destination layer 2-ID) may be used for sidelink communication, and layer 2-ID is set for V2X communication. It can be an ID. In addition, in sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation may be supported, and an RLC Acknowledged Mode (AM) or an Unacknowledged Mode (RLC UM) may be supported.

Meanwhile, a control plane protocol stack of UEs (eg, UE #5 235, UE #6 236) performing sidelink communication may be configured as follows.

FIG. 5 is a block diagram showing a first embodiment of a control plane protocol stack of a UE performing sidelink communication, and FIG. 6 is a block diagram showing a second embodiment of a control plane protocol stack of a UE performing sidelink communication. It is a block diagram.

5 and 6, UE #5 235 may be UE #5 235 shown in FIG. 2, and UE #6 236 may be UE #6 236 shown in FIG. I can. A scenario for sidelink communication between UE #5 235 and UE #6 236 may be one of sidelink communication scenarios #A to #D in Table 1. The control plane protocol stack illustrated in FIG. 5 may be a control plane protocol stack for transmission and reception of broadcast information (eg, Physical Sidelink Broadcast Channel (PSBCH)).

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

Meanwhile, the channels used in sidelink communication between UE #5 (235) and UE #6 (236) are PSSCH (Physical Sidelink Shared Channel), PSCCH (Physical Sidelink Control Channel), PSDCH (Physical Sidelink Discovery Channel), and PSBCH ( Physical Sidelink Broadcast Channel). The PSSCH may be used for transmission and reception of sidelink data, and may be configured in the UE (eg, UE #5 235, UE #6 236) by higher layer signaling. The PSCCH may be used for transmission and reception of sidelink control information (SCI), and may be configured in a UE (e.g., UE #5 235, UE #6 236) by higher layer signaling. have.

PSDCH can be used for discovery procedures. For example, the discovery signal may be transmitted through PSDCH. PSBCH may be used for transmission and reception of broadcast information (eg, system information). In addition, in sidelink communication between UE #5 235 and UE #6 236, a demodulation-reference signal (DM-RS), a synchronization signal, and the like may be used. The synchronization signal may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

Meanwhile, the sidelink transmission mode (TM) may be classified into sidelink TM #1 to #4 as shown in Table 2 below.

When sidelink TM #3 or #4 is supported, each of UE #5 (235) and UE #6 (236) performs sidelink communication using a resource pool set by the base station 210 I can. The resource pool may be set for each sidelink control information or sidelink data.

The resource pool for sidelink control information may be set based on an RRC signaling procedure (eg, a dedicated RRC signaling procedure, a broadcast RRC signaling procedure). The resource pool used for reception of sidelink control information may be set by a broadcast RRC signaling procedure. When sidelink TM #3 is supported, a resource pool used for transmission of sidelink control information may be set by a dedicated RRC signaling procedure. In this case, the sidelink control information may be transmitted through a resource scheduled by the base station 210 within a resource pool set by a dedicated RRC signaling procedure. When sidelink TM #4 is supported, a resource pool used for transmission of sidelink control information may be set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, the sidelink control information is autonomously selected by the UE (e.g., UE #5 (235), UE #6 (236)) within a resource pool set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. Can be transmitted through resources.

When sidelink TM #3 is supported, a resource pool for transmission and reception of sidelink data may not be set. In this case, sidelink data may be transmitted/received through resources scheduled by the base station 210. When sidelink TM #4 is supported, a resource pool for transmission and reception of sidelink data may be set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, the sidelink data is a resource autonomously selected by the UE (eg, UE #5 (235), UE #6 (236)) within the resource pool set by the RRC signaling procedure or the broadcast RRC signaling procedure. It can be transmitted and received through.

Next, methods of setting sidelink resources will be described. Even when a method performed in the first communication node (for example, transmission or reception of a signal) among communication nodes is described, the second communication node corresponding thereto is a method corresponding to the method performed in the first communication node (e.g. For example, signal reception or transmission) may be performed. That is, when the operation of UE #1 (e.g., vehicle #1) is described, the corresponding UE #2 (e.g., vehicle #2) may perform an operation corresponding to the operation of UE #1. have. Conversely, when the operation of UE #2 is described, UE #1 corresponding thereto may perform an operation corresponding to the operation of UE #2. In the embodiments described below, the operation of the vehicle may be an operation of a communication node located in the vehicle.

In embodiments, signaling may be one or a combination of two or more of higher layer signaling, MAC signaling, and physical (PHY) signaling. A message used for higher layer signaling may be referred to as a "higher layer message" or a "higher layer signaling message". A message used for MAC signaling may be referred to as a “MAC message” or a “MAC signaling message”. A message used for PHY signaling may be referred to as a “PHY message” or a “PHY signaling message”. Higher layer signaling may mean a transmission/reception operation of system information (eg, a master information block (MIB), a system information block (SIB)) and/or an RRC message. MAC signaling may refer to a transmission/reception operation of a MAC control element (CE). PHY signaling may mean a transmission/reception operation of control information (eg, downlink control information (DCI), uplink control information (UCI), SCI).

The sidelink signal may be a synchronization signal and a reference signal used for sidelink communication. For example, the synchronization signal may be a synchronization signal/physical broadcast channel (SS/PBCH) block, a sidelink synchronization signal (SLSS), a primary sidelink synchronization signal (PSSS), a secondary sidelink synchronization signal (SSSS), and the like. The reference signal is 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), and a discovery reference signal (DRS). ), etc.

The sidelink channel may be PSSCH, PSCCH, PSDCH, PSBCH, physical sidelink feedback channel (PSFCH), or the like. In addition, the sidelink channel may mean a sidelink channel including a sidelink signal mapped to specific resources in the corresponding sidelink channel. Sidelink communication may support a broadcast service, a multicast service, a groupcast service, and a unicast service.

In embodiments, methods of sidelink communication between a transmitting terminal and a receiving terminal will be described. The transmitting terminal may refer to a terminal that transmits data (eg, sidelink data), and the receiving terminal may refer to a terminal that receives data.

Sidelink communication may be performed based on a single SCI scheme or a multi SCI scheme. When a single SCI scheme is used, data transmission (eg, sidelink data transmission, SL-SCH (sidelink-shared channel) transmission) is performed based on one SCI (eg, 1st-stage SCI). I can. When the multiple SCI scheme is used, data transmission may be performed using two SCIs (eg, 1st-stage SCI and 2nd-stage SCI). SCI may be transmitted through PSCCH and/or PSSCH. When a single SCI scheme is used, SCI (eg, 1st-stage SCI) may be transmitted on the PSCCH. When the multiple SCI scheme is used, 1st-stage SCI may be transmitted on PSCCH, and 2nd-stage SCI may be transmitted on PSCCH or PSSCH. 1st-stage SCI may be referred to as “first stage SCI”, and 1st-stage SCI may be referred to as “second stage SCI”.

The first step SCI includes priority information, frequency resource assignment information, time resource allocation information, resource reservation period information, DMRS pattern information, second step SCI format information, beta_ It may include one or more information elements from among the offset indicator (beta_offset indicator), the number of DMRS ports, and modulation and coding scheme (MCS) information. The second step SCI includes HARQ processor identifier (ID), redundancy version (RV), source ID, destination ID, CSI request information, zone ID, and communication range requirements. range requirements).

In the time domain, the scheduling unit (eg, resource allocation unit) may be a symbol unit, a slot unit, or a subframe unit. One time duration allocated by one control information (eg, time resource assignment included in DCI and/or SCI) in the time domain is symbol(s), slot(s) ), or subframe(s). One or more time intervals may be set by one piece of control information. The number of time intervals set by one piece of control information may vary according to the size of data to be transmitted. When the size of data to be transmitted is large, one control information may be used to set a plurality of time intervals.

The number of time intervals set by one piece of control information may be indicated by a time aggregation level. When the time aggregation level is 1, the number of time intervals set by one piece of control information may be 1. When the time aggregation level is 2, the number of time intervals set by one piece of control information may be 2. That is, the two aggregated time intervals may be used for data transmission. When the time aggregation level is 3, the number of time intervals set by one piece of control information may be 3. That is, the aggregated three time intervals may be used for data transmission.

7 is a conceptual diagram illustrating a first embodiment of a method for allocating a sidelink resource when the time aggregation level is 1 in a communication system.

Referring to FIG. 7, when the time aggregation level is 1, one control information (eg, SCI) may be used to set one time interval. When the size of data to be transmitted from the first terminal to the second terminal is large, a plurality of time intervals (eg, a plurality of slots) may be required for data transmission. In this case, a plurality of time periods may be set, and since the time aggregation level is 1, each of the plurality of time periods may be set by different SCIs. Here, the size of time resources required for data transmission may be larger than the size of time resources constituting one PSSCH. Time resources (eg, PSSCH) through which data is transmitted in each time interval (eg, each slot) may be limited to some time resources.

When data is transmitted in two time intervals, the first terminal includes scheduling information (e.g., resource allocation information) of data through PSCCH #n in time interval #n (e.g., slot #n) SCI #n may be transmitted to the second terminal, and data may be transmitted to the second terminal through PSSCH #n indicated by SCI #n in time interval #n. The second terminal may acquire SCI #n by performing a monitoring operation (eg, blind decoding operation) in PSCCH #n within time interval #n, and by SCI #n in time interval #n. Data may be received from the first terminal through the indicated PSSCH #n.

In addition, the first terminal transmits SCI #m including data scheduling information (eg, resource allocation information) through PSCCH #m in time interval #m (eg, slot #m) to the second terminal. In the time period #m, data may be transmitted to the second terminal through PSSCH #m indicated by SCI #m. The second terminal can acquire SCI #m by performing a monitoring operation in PSCCH #m within time interval #m, and transmits data from the first terminal through PSSCH #m indicated by SCI #m in time interval #m. You can receive it.

Here, each of n and m may be a natural number, and m may be greater than n. Each of PSCCH #n and PSSCH #n may be a PSCCH and PSSCH set in a time period #n, and SCI #n may be an SCI transmitted in PSCCH #n. Each of PSCCH #m and PSSCH #m may be a PSCCH and PSSCH set in a time period #m, and SCI #m may be an SCI transmitted in PSCCH #m. The time interval #n and the time interval #m may be continuous time intervals or discontinuous time intervals. When the time interval #n and the time interval #m are discontinuous time intervals, the offset (e.g., interval) between the time interval #n and the time interval #m is one or two of higher layer signaling, MAC signaling, and PHY signaling. It can be indicated by a combination of the above.

8 is a conceptual diagram illustrating a first embodiment of a method for allocating a sidelink resource when the time aggregation level is 2 in a communication system.

Referring to FIG. 8, when the size of data to be transmitted from a first terminal to a second terminal is large, a plurality of time intervals (eg, a plurality of slots) may be required for data transmission. When the time aggregation level is 2, one control information (eg, SCI) may be used to set two time intervals. Time resources (eg, PSSCH) through which data is transmitted in each time interval (eg, each slot) may be limited to some time resources.

When data is transmitted in two time intervals, the first terminal includes scheduling information (e.g., resource allocation information) of data through PSCCH #n in time interval #n (e.g., slot #n) SCI #n can be transmitted to the second terminal, and data can be transmitted to the second terminal through PSSCH #n indicated by SCI #n in time interval #n, and by SCI #n in time interval #m Data can be transmitted to the second terminal through the indicated PSSCH #m. The second terminal can acquire SCI #n by performing a monitoring operation in PSCCH #n within time interval #n, and transmits data from the first terminal through PSSCH #n indicated by SCI #n in time interval #n. It can be received, and data can be received from the first terminal through PSSCH #m indicated by SCI #n in time interval #m.

The same data may be repeatedly transmitted in PSSCH #n and #m. In this case, the time aggregation level can be interpreted as indicating the number of times of repetitive data transmission. The MCS level (eg, coding scheme) applied to data transmitted in PSSCH #n may be different from the MCS level (eg, coding scheme) applied to data transmitted in PSSCH #m. In this case, SCI #n may include information element(s) for allocation of PSSCH #n and information element(s) for allocation of PSSCH #m. The information element(s) for allocation of PSSCH #n may be set independently from the information element(s) for allocation of PSSCH #m. The second terminal may perform a data reception operation (eg, a decoding operation) in PSCCH #n based on the information element(s) for allocation of PSSCH #n included in SCI #n, and SCI #n On the basis of the information element(s) for allocation of PSSCH #m included in the PSCCH #m, a data reception operation (eg, a decoding operation) may be performed.

When the same data is received in PSSCH #n and #m, the second terminal may combine data received in PSSCH #n and data received in PSSCH #m using a chase combining method. Alternatively, data in PSSCH #n and #m may be transmitted based on an incremental redundancy (IR) scheme. In this case, the second terminal may combine data received from PSSCH #n and data received from PSSCH #m using an IR scheme.

Here, each of n and m may be a natural number, and m may be greater than n. Each of PSCCH #n and PSSCH #n may be a PSCCH and PSSCH set in a time period #n, and SCI #n may be an SCI transmitted in PSCCH #n. PSSCH #m may be a PSSCH set in time interval #m. The time interval #n and the time interval #m may be continuous time intervals or discontinuous time intervals. When the time interval #n and the time interval #m are discontinuous time intervals, the offset (e.g., interval) between the time interval #n and the time interval #m is one or two of higher layer signaling, MAC signaling, and PHY signaling. It can be indicated by a combination of the above.

9 is a conceptual diagram illustrating a first embodiment of a method of allocating a sidelink resource when the time aggregation level is 3 in a communication system.

Referring to FIG. 9, when the size of data to be transmitted from a first terminal to a second terminal is large, a plurality of time intervals (eg, a plurality of slots) may be required for data transmission. When the time aggregation level is 3, one control information (eg, SCI) may be used to set three time intervals. Time resources (eg, PSSCH) through which data is transmitted in each time interval (eg, each slot) may be limited to some time resources.

When data is transmitted in three time intervals, the first terminal includes scheduling information (e.g., resource allocation information) of data through PSCCH #n in time interval #n (e.g., slot #n) SCI #n can be transmitted to the second terminal, and data can be transmitted to the second terminal through PSSCH #n indicated by SCI #n in time interval #n, and by SCI #n in time interval #m Data may be transmitted to the second terminal through the indicated PSSCH #m, and data may be transmitted to the second terminal through the PSSCH #k indicated by the SCI #n in the time period #k. The second terminal can acquire SCI #n by performing a monitoring operation in PSCCH #n within time interval #n, and transmits data from the first terminal through PSSCH #n indicated by SCI #n in time interval #n. Can be received, and data can be received from the first terminal through PSSCH #m indicated by SCI #n in time period #m, and through PSSCH #k indicated by SCI #n in time period #k Data can be received from the first terminal.

The same data may be repeatedly transmitted in PSSCH #n, #m, and #k. In this case, the time aggregation level can be interpreted as indicating the number of times of repetitive data transmission. The MCS levels (eg, coding schemes) applied to data transmitted in each of PSSCH #n, #m, and #k may be different. In this case, SCI #n may include information element(s) for allocation of PSSCH #n, information element(s) for allocation of PSSCH #m, and information element(s) for allocation of PSSCH #k. have. The information element(s) for allocation of PSSCH #n, the information element(s) for allocation of PSSCH #m, and the information element(s) for allocation of PSSCH #k may be set independently of each other.

The second terminal may perform a data reception operation (eg, a decoding operation) in PSCCH #n based on the information element(s) for allocation of PSSCH #n included in SCI #n, and SCI #n On the basis of the information element(s) for allocation of PSSCH #m included in the PSCCH #m, data reception operation (eg, decoding operation) may be performed, and the PSSCH #k included in SCI #n may be A reception operation (eg, a decoding operation) of data in PSSCH #k may be performed on the basis of the information element(s) for allocation.

When the same data is received in PSSCH #n, #m, and #k, the second terminal uses the chase combining method to receive data from PSSCH #n, data received from PSSCH #m, and PSSCH #k. You can combine the received data. Alternatively, data in PSSCH #n, #m, and #k may be transmitted based on the IR scheme. In this case, the second terminal may combine data received from PSSCH #n, data received from PSSCH #m, and data received from PSSCH #k using an IR scheme.

Here, each of n, m, and k may be a natural number, m may be greater than n, and k may be greater than m. Each of PSCCH #n and PSSCH #n may be a PSCCH and PSSCH set in a time period #n, and SCI #n may be an SCI transmitted in PSCCH #n. PSSCH #m may be a PSCCH configured in time interval #m, and PSSCH #k may be a PSSCH configured in time interval #k. The time intervals #n, #m, and #k may be continuous time intervals or discontinuous time intervals. When time intervals #n, #m, and #k are discontinuous time intervals, an offset (e.g., interval) between time intervals #n, #m, and #k is higher layer signaling, MAC signaling, and PHY signaling. It may be indicated by one or a combination of two or more of them.

Meanwhile, in the frequency domain, the scheduling unit may be a subcarrier unit, a resource block (RB) unit, a subchannel unit, or an RB set unit. In embodiments, the RB may be a physical resource block (PRB) or a common resource block (CRB). Each of one sub-channel and one RB set may include one or more RBs. A plurality of RBs included in each of one sub-channel and one RB set may be continuous RBs or discontinuous RBs. One frequency band allocated by one control information (eg, frequency resource assignment included in DCI and/or SCI) in the frequency domain is subcarrier(s), RB(s), and sub It may include channel(s), or RB set(s).

The number of frequency bands (eg, sub-channels or RB sets) set by one piece of control information may vary according to the size of data to be transmitted. When the size of data to be transmitted is large, a plurality of frequency bands may be set by one piece of control information. The number of frequency bands set by one piece of control information may be indicated by a frequency aggregation level. When the frequency aggregation level is 1, the number of frequency bands set by one piece of control information may be 1. When the frequency aggregation level is 2, the number of frequency bands set by one piece of control information may be 2. That is, the aggregated two frequency bands may be used for data transmission. When the frequency aggregation level is 3, the number of frequency bands set by one piece of control information may be 3. That is, the aggregated three frequency bands may be used for data transmission.

10 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the frequency aggregation level is 1 in a communication system.

Referring to FIG. 10, when the frequency aggregation level is 1, one control information (eg, SCI) may be used to set one frequency band (eg, a subchannel or an RB set). The first terminal can transmit SCI #i including data scheduling information (eg, resource allocation information) to the second terminal through PSCCH #i in frequency band #i (eg, RB set #i). In addition, data may be transmitted to the second terminal through PSSCH #i indicated by SCI #i in frequency band #i. The second terminal can acquire SCI #i by performing a monitoring operation on PSCCH #i in frequency band #i, and transmits data from the first terminal through PSSCH #i indicated by SCI #i in frequency band #i. You can receive it.

Here, i may be a natural number, each of PSCCH #i and PSSCH #i may be a PSCCH and PSSCH set in frequency band #i, and SCI #i may be SCI transmitted from PSCCH #i.

11 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the frequency aggregation level is 2 in a communication system.

Referring to FIG. 11, when the size of data to be transmitted from a first terminal to a second terminal is large, a plurality of frequency bands (eg, subchannels or RB sets) may be required for data transmission. Here, the size of the frequency resources required for data transmission may be larger than the size of the frequency resources constituting one PSSCH. When the frequency aggregation level is 2, one control information (eg, SCI) may be used to set two frequency bands.

The first terminal can transmit SCI #i including data scheduling information (eg, resource allocation information) to the second terminal through PSCCH #i in frequency band #i (eg, RB set #i). And, in frequency band #i, data may be transmitted to a second terminal through PSSCH #i indicated by SCI #i, and data may be transmitted to a second terminal through PSSCH #o indicated by SCI #i in frequency band #o. Can be transmitted to the terminal. The second terminal can acquire SCI #i by performing a monitoring operation on PSCCH #i in frequency band #i, and transmits data from the first terminal through PSSCH #i indicated by SCI #i in frequency band #i. And receive data from the first terminal through PSSCH #o indicated by SCI #i in frequency band #o.

The aggregated frequency bands may be recognized as one PSSCH, and data may be mapped to one PSSCH (eg, aggregated frequency bands). The same data may be repeatedly transmitted in PSSCH #i and PSSCH #o. In this case, the second terminal may combine data received from PSSCH #i and data received from PSSCH #o based on the chase combining method. Alternatively, data in PSSCH #i and PSSCH #o may be transmitted in an IR method. In this case, the second terminal may combine data received on PSCCH #i and data received on PSCCH #o based on the IR scheme. Here, the frequency aggregation level may be interpreted as the number of repetitive transmissions of data.

Here, each of i and o may be a natural number, and i may be greater than o. Each of PSCCH #i and PSSCH #i may be a PSCCH and PSSCH configured in frequency band #i, and SCI #i may be an SCI transmitted in PSCCH #i. PSSCH #o may be a PSSCH configured in frequency band #o. The frequency band #i and the frequency band #o may be continuous frequency bands or discontinuous frequency bands. When frequency band #i and frequency band #o are discontinuous frequency bands, an offset (e.g., an interval) between frequency band #i and frequency band #o is one or two of higher layer signaling, MAC signaling, and PHY signaling. It can be indicated by a combination of the above.

12 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the frequency aggregation level is 3 in a communication system.

Referring to FIG. 12, when the size of data to be transmitted from a first terminal to a second terminal is large, a plurality of frequency bands (eg, subchannels or RB sets) may be required for data transmission. Here, the size of the frequency resources required for data transmission may be larger than the size of the frequency resources constituting one PSSCH. When the frequency aggregation level is 3, one control information (eg, SCI) may be used to set three frequency bands.

The first terminal can transmit SCI #i including data scheduling information (eg, resource allocation information) to the second terminal through PSCCH #i in frequency band #i (eg, RB set #i). And, in frequency band #i, data may be transmitted to a second terminal through PSSCH #i indicated by SCI #i, and data may be transmitted to a second terminal through PSSCH #o indicated by SCI #i in frequency band #o. It can be transmitted to the terminal, and data can be transmitted to the second terminal through PSSCH #p indicated by SCI #i in frequency band #p. The second terminal can acquire SCI #i by performing a monitoring operation on PSCCH #i in frequency band #i, and transmits data from the first terminal through PSSCH #i indicated by SCI #i in frequency band #i. Data can be received from the first terminal through PSSCH #o indicated by SCI #i in frequency band #o, and through PSSCH #p indicated by SCI #i in frequency band #p Data can be received from the first terminal.

The aggregated frequency bands may be recognized as one PSSCH, and data may be mapped to one PSSCH (eg, aggregated frequency bands). The same data may be repeatedly transmitted in PSSCH #i, PSSCH #o, and PSSCH #p. In this case, the second terminal may combine data received from PSSCH #i, data received from PSSCH #o, and data received from PSSCH #p based on the chase combining scheme. Alternatively, data in PSSCH #i, PSSCH #o, and PSSCH #p may be transmitted in an IR scheme. In this case, the second terminal may combine data received on PSCCH #i, data received on PSCCH #o, and data received on PSCCH #p based on the IR scheme. Here, the frequency aggregation level may be interpreted as the number of repetitive transmissions of data.

Here, each of i, o, and p may be a natural number, o may be greater than p, and i may be greater than o. Each of PSCCH #i and PSSCH #i may be a PSCCH and PSSCH configured in frequency band #i, and SCI #i may be an SCI transmitted in PSCCH #i. PSSCH #o may be a PSSCH set in frequency band #o, and PSSCH #p may be a PSSCH set in frequency band #p. The frequency band #i, the frequency band #o, and the frequency band #p may be continuous frequency bands or discontinuous frequency bands. If the frequency band #i, the frequency band #o, and the frequency band #p are discontinuous frequency bands, the offset (e.g., the interval) between the frequency band #i, the frequency band #o, and the frequency band #p is the upper layer. It may be indicated by one or a combination of two or more of signaling, MAC signaling, and PHY signaling.

13 is a conceptual diagram illustrating a first embodiment of a method for allocating sidelink resources when the time aggregation level is 3 and the frequency aggregation level is 2 in a communication system.

Referring to FIG. 13, an aggregation operation in a time interval and an aggregation operation in a frequency band may be used together. When the time aggregation level is 3, three time intervals may be aggregated. When the frequency aggregation level is 2, two frequency bands may be aggregated. In this case, one control information (eg, SCI) may be used to set six resource regions. Resource region A may be composed of time interval #n and frequency band #i, resource region B may be composed of time interval #m and frequency band #i, and resource region C may be composed of time interval #k and frequency band #i. It can be composed of i. Resource region D may be composed of time interval #n and frequency band #o, resource region E may be composed of time interval #m and frequency band #o, and resource region F may be composed of time interval #k and frequency band #o. It can be composed of o.

The first terminal can transmit the SCI including scheduling information (eg, resource allocation information) of data through the PSCCH in the resource region A to the second terminal, and the resource regions A, B, C, D, E, and In each F, data may be transmitted to the second terminal through the PSSCH indicated by the SCI. The second terminal can acquire SCI by performing a monitoring operation on the PSCCH in the resource region A, and transmits data through the PSSCH indicated by the SCI in each of the resource regions A, B, C, D, E, and F. It can be received from the terminal.

14 is a flowchart illustrating a first embodiment of a method of setting sidelink resources in a communication system.

Referring to FIG. 14, the communication system may include a base station, a first terminal, and a second terminal. The base station may be the base station 210 illustrated in FIG. 2, the first terminal may be UE #5 235 illustrated in FIG. 2, and the second terminal may be UE #6 236 illustrated in FIG. 2 I can. The first terminal and/or the second terminal may be located within the coverage of the base station. Alternatively, the first terminal and/or the second terminal may be located outside the coverage of the base station. Each of the base station, the first terminal, and the second terminal may be configured in the same or similar to the communication node 300 illustrated in FIG. 3. The first terminal and/or the second terminal may support the protocol stack shown in FIGS. 4 to 6.

The base station may generate sidelink configuration information (S1401). The sidelink configuration information may include time domain allocation information, frequency domain allocation information, and/or retransmission method information. The time domain allocation information may indicate time resources (eg, time resources of PSSCH) used for transmission and reception of data. The frequency domain allocation information may indicate frequency resources (eg, frequency resources of PSSCH) used for transmission and reception of data. The retransmission method information may indicate a data retransmission method. For example, the retransmission method information may indicate a chase combining method and/or an IR method. Alternatively, the retransmission method information may indicate that the chase combining method and the IR method are not used.

The time domain allocation information may include one or more information elements among the information elements defined in Table 3 below. The time domain allocation information may be configured by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and sidelink (SL)-specific signaling.

The temporal aggregation level may be set to one or more values. For example, the time aggregation level may be set to one or more values among {1, 2, 3, 4}. When the time aggregation level is set to one value, one value indicated by the time aggregation level may be used in sidelink communication between terminals. In "when the time aggregation level is set to 2 and the scheduling unit is one slot", two slots may be allocated according to one control information. Two slots allocated by one control information may be consecutive slots or discontinuous slots. A time offset indicating an interval between a plurality of slots allocated by one piece of control information may be included in Table 3.

When the time aggregation level is set to a plurality of values, one of the plurality of values may be used in sidelink communication between terminals. The plurality of values may mean candidate temporal aggregation levels. Here, one value of the time aggregation level may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling. For example, the temporal aggregation level (eg, candidate temporal aggregation levels) may be set to {2, 3}, and one of {2, 3} may be used for higher layer signaling, MAC signaling, and PHY. It may be indicated by one or a combination of two or more of signaling.

The start symbol information may indicate the index of the start symbol within a time interval (eg, a slot). For example, when some time resources are used for transmission and reception of data in a slot, the start symbol information may indicate the index of the start symbol of some time resources. Alternatively, the start symbol information is a specific symbol (e.g., a start symbol or an end symbol) in the time resource(s) through which control information is transmitted and received, and a specific symbol (e.g., For example, a symbol offset between a start symbol or an end symbol) may be indicated.

The start symbol information may indicate one or more start symbol indexes or one or more symbol offsets. When the start symbol information indicates one start symbol index or one symbol offset, one start symbol index or one symbol offset indicated by the start symbol information may be used in sidelink communication between terminals. When the start symbol information indicates a plurality of start symbol indices or a plurality of symbol offsets, "one start symbol index among a plurality of start symbol indexes" or "one symbol offset among a plurality of symbol offsets" is the terminal It can be used in sidelink communication between. Here, one start symbol index or one symbol offset may be indicated by one or a combination of two or more of other upper layer signaling, MAC signaling, and PHY signaling. The plurality of start symbol indices may mean candidate start symbol indices, and the plurality of symbol offsets may mean candidate symbol offsets.

When some time resources are used for transmission and reception of data within a time period (eg, a slot), the length information may indicate the length of some time resources. Length information may be set in units of symbols. The length information may indicate one or more lengths. When the length information indicates one length, one length indicated by the length information may be used in sidelink communication between terminals. When the length information indicates a plurality of lengths (eg, candidate lengths), one of the plurality of lengths may be used in sidelink communication between terminals. Here, one length may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling.

When some time resources are used for transmission and reception of data within a time interval (eg, a slot), SLIV may indicate a start symbol and length of some time resources. SLIV can be set to one or more values. When SLIV indicates one value, one value indicated by SLIV may be used in sidelink communication between terminals. When SLIV indicates a plurality of values, one of the plurality of values may be used in sidelink communication between terminals. A plurality of values of SLIV may mean candidate SLIVs. Here, one value of SLIV may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling.

Meanwhile, the time domain allocation information may be set for each resource pool (eg, sidelink (SL) resource pool). For example, when aggregated time intervals are used for sidelink communication, time domain allocation information may be set as shown in Table 4 below. In addition, Table 4 may further include retransmission method information.

In each resource pool, the time aggregation level may be set to a plurality of values. In this case, one temporal aggregation level used for sidelink communication may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling. The start symbol index may indicate a relative position based on a specific slot or a specific symbol. When a plurality of start symbols are configured in each resource pool, one start symbol used for sidelink communication may be indicated by one or a combination of two or more of other upper layer signaling, MAC signaling, and PHY signaling.

All symbols within a time interval (eg, a slot) can be used for data transmission. Alternatively, some symbols within the time interval may be used for data transmission. In this case, some symbols may be indicated by one or a combination of two or more of a start symbol, a length, and SLIV.

Alternatively, the time domain allocation information may be set for each time aggregation pattern. For example, when aggregated time intervals are used for sidelink communication, time domain allocation information may be set as shown in Table 5 below. In addition, Table 5 may further include retransmission method information.

The setting information of the time aggregation pattern may be included in the sidelink setting information. The time aggregation pattern may be indicated by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and SL-specific signaling. For example, time aggregation patterns #1 to #4 may be set by higher layer signaling, and information elements included in SCI (for example, an indicator having a size of 2 bits) are time aggregation patterns #1 to # One of 4 time aggregation patterns may be indicated. The time aggregation pattern used for sidelink communication may be indicated by an explicit manner, an implicit manner, or a "combination of an explicit manner and an implicit manner". The configuration information defined in Tables 3 to 5 may be indicated or changed by higher layer signaling, MAC signaling, and/or PHY signaling.

Meanwhile, the frequency domain allocation information may include one or more information elements among the information elements defined in Table 6 below. In Table 6, a combination of start frequency information and size information may indicate a PSSCH transmission possible region. The frequency domain allocation information may be configured by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and SL-specific signaling.

The frequency aggregation level may be set to one or more values. For example, the frequency aggregation level may be set to one or more of {1, 2, 3, 4}. When the frequency aggregation level is set to one value, one value indicated by the frequency aggregation level may be used in sidelink communication between terminals. If "the frequency aggregation level is set to 2 and the scheduling unit is one RB set", two RB sets may be allocated according to one control information. Two RB sets allocated by one control information may be contiguous RB sets or discontinuous RB sets. A frequency offset indicating an interval between a plurality of RE sets allocated by one piece of control information may be included in Table 6.

When the frequency aggregation level is set to a plurality of values, one of the plurality of values may be used in sidelink communication between terminals. The plurality of values may mean candidate frequency aggregation levels. Here, one value of the frequency aggregation level may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling. For example, the frequency aggregation level may be set to {2, 3}, and one of {2, 3} may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling. I can.

The start frequency information may indicate an index of a start frequency within a frequency band (eg, RB set). For example, when some frequency resources in the RB set are used for transmission and reception of data, the start frequency information is a start subcarrier index or a start RB index (for example, a start PRB index or a start CRB index) of some frequency resources. Can be ordered. Alternatively, the start frequency information is a specific frequency resource through which control information is transmitted and received (e.g., a start subcarrier, an end subcarrier, a start RB, or an end RB) and a specific frequency resource through which data scheduled by the corresponding control information is transmitted and received ( For example, a frequency offset between a start subcarrier, an end subcarrier, a start RB, or an end RB) may be indicated. Alternatively, the start frequency information may indicate a frequency offset between the reference point and a specific frequency resource through which data is transmitted and received (eg, a start subcarrier, an end subcarrier, a start RB, or an end RB).

The start frequency information may indicate one or more start subcarrier indexes, start RB indexes, or frequency offsets. When the start frequency information indicates one start subcarrier index, one start RB index, or one frequency offset, one start subcarrier index indicated by the start frequency information in sidelink communication between terminals, one The starting RB index, or one frequency offset can be used. The start frequency information includes a plurality of start subcarrier indexes (eg, candidate start subcarrier indexes), a plurality of start RB indexes (eg, candidate start RB indexes), or a plurality of frequency offsets (eg, candidate start subcarrier indexes). For example, when indicating candidate frequency offsets), “one starting subcarrier index among a plurality of starting subcarrier indices”, “one starting RB index among a plurality of starting RB indices”, or “a plurality of frequencies One of the offsets may be used in sidelink communication between terminals. Here, one start subcarrier index, one start RB index, or one frequency offset may be indicated by one or a combination of two or more of other upper layer signaling, MAC signaling, and PHY signaling.

When some frequency resources in a frequency band (eg, an RB set) are used for transmission and reception of data, the size information may indicate the size of some frequency resources or the number of RBs constituting some frequency resources. The size information may indicate one or more sizes or the number of RBs. When the size information indicates one size or the number of RBs, one size indicated by the size information or the number of RBs may be used in sidelink communication between terminals. When the size information indicates a plurality of sizes (eg, candidate sizes) or a plurality of RB numbers (eg, the number of candidate RBs), “one size among a plurality of sizes” or “multiple sizes” Among the number of RBs of "one RB number" may be used in sidelink communication between terminals. Here, one size or the number of one RB may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling.

Meanwhile, the frequency domain allocation information may be set for each resource pool (eg, SL resource pool). For example, when aggregated frequency bands are used for sidelink communication, frequency domain allocation information may be set as shown in Table 7 below. In addition, Table 7 may further include retransmission method information.

The frequency aggregation level in each resource pool may be set to a plurality of values. In this case, one frequency aggregation level used for sidelink communication may be indicated by one or a combination of two or more of other higher layer signaling, MAC signaling, and PHY signaling. The start frequency index may indicate a relative position based on a specific subcarrier or a specific RB. When a plurality of start frequencies are set in each resource pool, one start frequency used for sidelink communication may be indicated by one or a combination of two or more of other upper layer signaling, MAC signaling, and PHY signaling.

The combination of the start frequency information and the size information may indicate a PSSCH transmission possible region. A PSSCH transmittable region A for resource pool #1 may be configured, a PSSCH transmittable region B may be configured for resource pool #2, and a PSSCH transmittable region C may be configured for resource pool #3, and , PSSCH transmission available region D for resource pool #4 may be configured. One or more PSSCH transmission possible regions may be configured for each frequency aggregation level. Information elements can be mapped one-to-one. The signaling operation of the frequency aggregation level may be performed independently from the signaling operation of "start frequency information and size information". When the PSSCH transmission possible region is set in the entire frequency band, the combination of the start frequency information and the size information may indicate the entire frequency band.

Alternatively, the frequency domain allocation information may be set for each frequency aggregation pattern. For example, when aggregated frequency bands are used for sidelink communication, frequency domain allocation information may be set as shown in Table 8 below. In addition, Table 8 may further include retransmission method information.

The configuration information of the frequency aggregation pattern may be included in the sidelink configuration information. The frequency aggregation pattern may be indicated by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and SL-specific signaling. For example, frequency aggregation patterns #1 to #4 may be set by higher layer signaling, and information elements (eg, an indicator having a size of 2 bits) included in SCI are frequency aggregation patterns #1 to # One of the 4 frequency aggregation patterns may be indicated. The frequency aggregation pattern used for sidelink communication may be indicated by an explicit method, an implicit method, or a "combination of an explicit method and an implicit method". The configuration information defined in Tables 6 to 8 may be indicated or changed by higher layer signaling, MAC signaling, and/or PHY signaling.

Meanwhile, aggregated time intervals and aggregated frequency bands may be used for sidelink communication. In this case, time domain allocation information and frequency domain allocation information may be set for each resource pool (eg, SL resource pool). Time domain allocation information and frequency domain allocation information may be set as shown in Table 9 below. In addition, Table 9 may further include retransmission method information.

A plurality of temporal aggregation levels and a plurality of frequency aggregation levels for each resource pool may be set. In this case, one time aggregation level and one frequency aggregation level used for sidelink communication may be indicated by SCI. The start symbol information may indicate a relative position based on a specific slot or a specific symbol. A plurality of start symbols may be set in each resource pool, and one start symbol used for sidelink communication may be indicated by SCI. The combination of the start symbol information and the length information may indicate some resources or all resources of a time interval.

The combination of the start frequency information and the size information may indicate a PSSCH transmission possible region in the frequency domain. The PSSCH transmission possible region may be set for each resource pool. A PSSCH transmittable region A may be configured for resource pool #1, a PSSCH transmittable region B may be configured for resource pool #2, and a PSSCH transmittable region C may be configured for resource pool #3, and , PSSCH transmission available region D may be configured for resource pool #4. The start frequency information may indicate a relative position based on a specific frequency resource (eg, subcarrier, PRB, CRB, reference point).

One or more PSSCH transmission possible regions may be configured for each frequency aggregation level. Information elements can be mapped one-to-one. The signaling operation of the frequency aggregation level may be performed independently from the signaling operation of "start frequency information and size information". When the PSSCH transmission possible region is set in the entire frequency band, the combination of the start frequency information and the size information may indicate the entire frequency band.

The configuration information (eg, one or more information elements) of Table 9 may be indicated or changed by higher layer signaling, MAC signaling, and/or PHY signaling. The configuration information (eg, one or more information elements) of Table 9 may be indicated by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and SL-specific signaling. .

Alternatively, the time domain allocation information and the frequency domain allocation information may be set for each time/frequency aggregation pattern. Time domain allocation information and frequency domain allocation information may be set as shown in Table 10 below. In addition, Table 10 may further include retransmission method information.

The time/frequency aggregation pattern may be indicated by one or a combination of two or more of cell-specific signaling, UE-specific signaling, resource pool-specific signaling, and SL-specific signaling. The configuration information (eg, one or more information elements) of Table 10 may be indicated or changed by higher layer signaling, MAC signaling, and/or PHY signaling. When the time/frequency aggregation patterns #1 to #8 are set by higher layer signaling, one time/frequency aggregation pattern used for sidelink communication is an information element included in the SCI (e.g., the size of 3 bits. Can be indicated by an indicator). One time/frequency aggregation pattern may be indicated by an explicit manner, an implicit manner, or a “combination of an explicit manner and an implicit manner”.

Meanwhile, the base station may transmit a higher layer message including the sidelink configuration information generated in step S1401 (S1402). Alternatively, the sidelink configuration information may be transmitted by one or a combination of two or more of higher layer signaling, MAC signaling, and PHY signaling. The terminal(s) (eg, the first terminal and/or the second terminal) may receive an upper layer message from the base station and check sidelink configuration information included in the higher layer message. Alternatively, the terminal(s) may obtain sidelink configuration information by receiving a higher layer message, a MAC message, and/or a PHY message. The terminal(s) may acquire time domain allocation information, frequency domain allocation information, and/or retransmission method information included in the sidelink configuration information.

The time domain allocation information may include one or more information elements defined in Table 3. Time domain allocation information (or "time domain allocation information and retransmission method information") may be set for each resource pool as shown in Table 4. Alternatively, time domain allocation information (or "time domain allocation information and retransmission method information") may be set for each time aggregation pattern as shown in Table 5. The frequency domain allocation information may include one or more information elements defined in Table 6. Frequency domain allocation information (or "frequency domain allocation information and retransmission method information") may be set for each resource pool as shown in Table 7. Alternatively, frequency domain allocation information (or "frequency domain allocation information and retransmission method information") may be set for each frequency aggregation pattern as shown in Table 8. Time domain allocation information, frequency domain allocation information, and retransmission method information may be set for each resource pool as shown in Table 9. Alternatively, time domain assignment information, frequency domain assignment information, and retransmission method information may be set for each time/frequency aggregation pattern as shown in Table 10.

When data to be transmitted from the first terminal to the second terminal exists, the first terminal may generate an SCI including scheduling information of the data (S1403). The SCI generated in step S1403 may include “first step SCI” or “first step SCI and second step SCI”. The SCI (eg, the first step SCI and/or the second step SCI) may include one or more information elements described in Table 11 below.

In Table 11, the time aggregation level and/or the time aggregation pattern may be included in the time resource allocation information, and the frequency aggregation level and/or the frequency aggregation pattern may be included in the frequency resource allocation information. One or more information elements from among the time aggregation level, frequency aggregation level, retransmission method information, resource pool information, time aggregation pattern, frequency aggregation pattern, and time/frequency aggregation pattern described in Table 11 are the second step SCI instead of the first step SCI. Can be included in

The frequency resource allocation information may include information indicating start frequency information and/or size information described in Table 6. The time resource allocation information may include start symbol information, length information, and/or information indicating SLIV described in Table 3. When the aggregated time interval(s) are used for sidelink communication, the time aggregation level may indicate the number of time intervals allocated by SCI. The temporal aggregation level included in the SCI may indicate one temporal aggregation level from among the temporal aggregation levels set by higher layer signaling. When higher layer signaling indicates one temporal aggregation level, the SCI may not include the temporal aggregation level. In this case, the sidelink communication between the first terminal and the second terminal may be performed based on the time aggregation level set by higher layer signaling.

When the aggregated frequency interval(s) is used for sidelink communication, the frequency aggregation level may indicate the number of frequency bands allocated by SCI. The frequency aggregation level included in the SCI may indicate one frequency aggregation level from among the frequency aggregation levels set by higher layer signaling. When higher layer signaling indicates one frequency aggregation level, the SCI may not include the frequency aggregation level. In this case, the sidelink communication between the first terminal and the second terminal may be performed based on the frequency aggregation level set by higher layer signaling. When both the aggregated time interval(s) and the aggregated frequency interval(s) are used for sidelink communication, one time aggregation level and one frequency aggregation level may be indicated based on the above-described method.

Retransmission method information included in SCI may indicate N/A, chase combining, or IR. When the retransmission method information is indicated by higher layer signaling, the SCI may not include the retransmission method information. The resource pool information included in the SCI indicates one resource pool among the resource pools defined in Table 4, one resource pool among the resource pools defined in Table 7, or one resource pool among the resource pools defined in Table 9. I can. The resource pools defined in Table 4, the resource pools defined in Table 7, and/or the resource pools defined in Table 9 may be configured by higher layer signaling. When one resource pool is indicated by higher layer signaling, SCI may not include resource pool information.

The temporal aggregation pattern included in the SCI may indicate one temporal aggregation pattern among the temporal aggregation patterns defined in Table 5. The temporal aggregation patterns defined in Table 5 may be set by higher layer signaling. When one temporal aggregation pattern is indicated by higher layer signaling, the SCI may not include the temporal aggregation pattern. The frequency aggregation pattern included in the SCI may indicate one frequency aggregation pattern among the frequency aggregation patterns defined in Table 8. The frequency aggregation patterns defined in Table 8 may be set by higher layer signaling. When one frequency aggregation pattern is indicated by higher layer signaling, the SCI may not include the frequency aggregation pattern. The time/frequency aggregation pattern included in the SCI may indicate one time/frequency aggregation pattern among the time/frequency aggregation patterns defined in Table 10. The time/frequency aggregation patterns defined in Table 10 may be set by higher layer signaling. When one time/frequency aggregation pattern is indicated by higher layer signaling, the SCI may not include the time/frequency aggregation pattern.

The first terminal may transmit the SCI to the second terminal in a sidelink channel (eg, PSCCH and/or PSSCH) (S1404). The second terminal may receive SCI from the first terminal by performing a monitoring operation (eg, blind decoding operation) in a sidelink channel (eg, PSCCH and/or PSSCH), and information elements included in the SCI (S) (for example, information element(s) defined in Table 11) can be identified.

The first terminal may transmit data to the second terminal from sidelink resources (eg, PSSCH) indicated by the SCI (S1405). Sidelink resources may be indicated by sidelink configuration information received in step S1402 and/or SCI received in step S1404. When the time aggregation level is 2, the first terminal can transmit data to the second terminal in the PSSCH within the time intervals #n and #m indicated by the SCI in the embodiment shown in FIG. Data may be received from the first terminal in the PSSCH in intervals #n and #m. When the frequency aggregation level is 3, the first terminal can transmit data to the second terminal in the PSSCH in the frequency bands #i, #o, and #p indicated by the SCI in the embodiment shown in FIG. 2 The terminal may receive data from the first terminal in the PSSCH in frequency bands #i, #o, and #p.

"When the time aggregation level is 3 and the frequency aggregation level is 2", the first terminal can transmit data from the PSSCH in the resource regions A to F indicated by the SCI to the second terminal in the embodiment shown in FIG. And, the second terminal may receive data from the first terminal in the PSSCH in the resource regions A to F. The same data may be retransmitted in the above-described data transmission procedure. In this case, the second terminal may perform a data combining operation based on a retransmission method (eg, a chase combining method) indicated by higher layer signaling, MAC signaling, and/or PHY signaling. In addition, when data is transmitted in the IR method in the above-described data transmission procedure, the second terminal is based on a retransmission method (e.g., IR method) indicated by higher layer signaling, MAC signaling, and/or PHY signaling. Thus, a data combining operation can be performed.

The methods according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the computer-readable medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software.

Examples of computer-readable media include hardware devices specially configured to store and execute program instructions, such as rom, ram, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The above-described hardware device may be configured to operate as at least one software module to perform the operation of the present invention, and vice versa.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention described in the following claims. I will be able to.

Claims (20)

As a method of operating a first terminal in a communication system,
SCI including a time aggregation level indicating n time intervals, time resource allocation information indicating time resources used for data transmission within the n time intervals, and frequency resource allocation information generating (sidelink control information);
Transmitting the SCI to a second terminal; And
Transmitting the data to the second terminal in a physical sidelink shared channel (PSSCH) consisting of the time resources and frequency resources indicated by the frequency resource allocation information,
Wherein n is a natural number of 1 or more, the operating method of the first terminal. The method according to claim 1,
A method of operating a first terminal, wherein a plurality of temporal aggregation levels are set by higher layer signaling, and the temporal aggregation level included in the SCI is one of the plurality of temporal aggregation levels. The method according to claim 1,
The time resource allocation information includes at least one of an index of a start symbol of the time resources and information indicating a length of the time resources. The method according to claim 1,
The frequency resource allocation information includes at least one of an index of a starting resource (RB) of the frequency resources and information indicating the number of RBs constituting the frequency resources. The method according to claim 1,
A time offset exists between the n time intervals in a time domain, and the time offset is set by higher layer signaling. The method according to claim 1,
The SCI further includes a frequency aggregation level indicating p frequency bands, the frequency resources are located within the p frequency bands, and p is a natural number of 1 or more. The method of claim 6,
A method of operating a first terminal, wherein a plurality of frequency aggregation levels are set by higher layer signaling, and the frequency aggregation level included in the SCI is one of the plurality of frequency aggregation levels. The method of claim 6,
In a frequency domain, a frequency offset exists between the p frequency bands, and the frequency offset is set by higher layer signaling. The method according to claim 1,
Each of the n time intervals is one slot, and the frequency resources are a resource block (RB) set. The method according to claim 1,
The SCI further includes information indicating a retransmission method of the data, and the retransmission method is a chase combining method or an incremental redundancy (IR) method. As a method of operating a first terminal in a communication system,
SCI including time resource allocation information, a frequency aggregation level indicating p frequency bands, and frequency resource allocation information indicating frequency resources used for data transmission within the p frequency bands generating (sidelink control information);
Transmitting the SCI to a second terminal; And
Transmitting the data to the second terminal in a physical sidelink shared channel (PSSCH) consisting of the frequency resources and time resources indicated by the time resource allocation information,
Wherein p is a natural number of 1 or more, the operating method of the first terminal. The method of claim 11,
A method of operating a first terminal, wherein a plurality of frequency aggregation levels are set by higher layer signaling, and the frequency aggregation level included in the SCI is one of the plurality of frequency aggregation levels. The method of claim 11,
In a frequency domain, a frequency offset exists between the p frequency bands, and the frequency offset is set by higher layer signaling. The method of claim 11,
The frequency resource allocation information includes at least one of an index of a starting resource (RB) of the frequency resources and information indicating the number of RBs constituting the frequency resources. As a method of operating a first terminal in a communication system,
receiving a higher layer message including a time aggregation level indicating n time intervals from a base station;
Generating sidelink control information (SCI) including time resource allocation information and frequency resource allocation information indicating time resources used for data transmission within the n time intervals indicated by the time aggregation level ;
Transmitting the SCI to a second terminal; And
Transmitting the data to the second terminal in a physical sidelink shared channel (PSSCH) consisting of the time resources and frequency resources indicated by the frequency resource allocation information,
Wherein n is a natural number of 1 or more, the operating method of the first terminal. The method of claim 15,
The higher layer message further includes a frequency aggregation level indicating p frequency bands, the frequency resources are located in the p frequency bands, and p is a natural number of 1 or more. The method of claim 16,
The time aggregation level and the frequency aggregation level are set for each resource pool, and configuration information of the resource pool is included in the higher layer message. The method of claim 15,
The upper layer message further includes at least one of an index of a start symbol of the time resources, information indicating a length of the time resources, and a time offset between the n time periods. The method of claim 16,
The upper layer message includes at least one of an index of a start RB (resource) of the frequency resources, information indicating the number of RBs constituting the frequency resources, and a frequency offset between the p frequency bands. How the terminal operates. The method of claim 15,
The upper layer message further includes information indicating a retransmission method of the data, and the retransmission method is a chase combining method or an incremental redundancy (IR) method.

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