KR20210153976A - A method and an apparatus for resource allocation by inter-ue coordination in vehicle-to-everything system - Google Patents

Abstract

The present disclosure relates to a communication technique for converging a 5G communication system to support a higher data rate than a 4G system with IoT technology, and a system thereof. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security- and safety-related services, etc.) based on 5G communication technology and IoT-related technology. The present disclosure relates to a method and apparatus for selecting a vehicle-to-everything (V2X) transmission resource by inter-UE coordination in a V2X system. A method for processing a control signal in a wireless communication system includes the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing, to the base station.

Description

Resource allocation method and apparatus through cooperation between terminals in V2X system

The present invention relates to a wireless mobile communication system, and in particular, in a process in which a vehicle terminal supporting vehicle-to-everything (V2X) transmits and receives information using a sidelink with another vehicle terminal and a pedestrian portable terminal. It relates to a method and apparatus for performing resource allocation through Inter-UE coordination.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or the LTE system after (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway. In addition, in the 5G system, FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), which are advanced coding modulation (Advanced Coding Modulation: ACM) methods, and FBMC (Filter Bank Multi Carrier), NOMA, which are advanced access technologies, (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. will be. The application of cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology.

On the other hand, V2X, which can be supported in 5G communication system, is a technology that can improve the information environment of vehicles and roads, and the stability and convenience of driving, and research for its implementation is continuing.

The present invention relates to a wireless communication system, in a method and apparatus for selecting a transmission resource through cooperation between terminals in a process in which a vehicle terminal supporting V2X exchanges information with another vehicle terminal and a pedestrian portable terminal using a sidelink. it's about Specifically, it relates to a method of exchanging information for inter-UE coordination, a method of allocating sidelink transmission resources through the method, and operations of a base station and a terminal therefor.

The present invention provides a control signal processing method in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

The present invention is to propose a method for inter-UE coordination in sidelink communication and a procedure through which the UE performs resource selection. Through the proposed method, the performance of resource allocation can be improved. In addition, it can be effectively used to minimize the power consumption of the terminal.

1 is a view showing a V2X system according to an embodiment of the present disclosure.
2 is a diagram illustrating a V2X communication method performed through a sidelink according to an embodiment of the present disclosure.
3 is a diagram illustrating a resource pool used for sidelink transmission and reception according to an embodiment of the present disclosure.
4 is a diagram illustrating a method for a base station to allocate transmission resources in a sidelink according to an embodiment of the present disclosure.
5 is a diagram illustrating a method in which a terminal directly allocates a transmission resource of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure.
6 is a diagram illustrating a mapping structure of physical channels mapped to one slot in a sidelink according to an embodiment of the present disclosure.
7 is a diagram illustrating a scenario of performing Inter-UE coordination according to an embodiment of the present disclosure.
8 is a diagram illustrating an operation of a terminal performing cooperation between terminals according to various embodiments of the present disclosure.
9 is a block diagram schematically illustrating a structure of a terminal according to an embodiment of the present disclosure.
10 is a block diagram schematically illustrating a structure of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.

Advantages and features of the present disclosure, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the present disclosure to be complete, and those of ordinary skill in the art to which the present disclosure pertains. It is provided to fully understand the scope of the present disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory which may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible that the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may be performed substantially simultaneously, or the blocks may sometimes be performed in the reverse order according to a corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA or ASIC, and '~ unit' performs certain roles. However, '-part' is not limited to software or hardware. '~' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Accordingly, as an example, '~' indicates components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

In describing the embodiments of the present disclosure in detail, the wireless access network New RAN (NR) on the 5G mobile communication standard initiated by the 3rd generation partnership project long term evolution (3GPP), a mobile communication standard standardization organization, and the packet core as the core network ( 5G System, or 5G Core Network, or NG Core: next generation core) is the main target, but the main gist of the present disclosure is in other communication systems having a similar technical background in a range that does not significantly deviate from the scope of the present disclosure It can be applied with some modifications, and this will be possible by the judgment of a person skilled in the art of the present disclosure.

In the 5G system, in order to support network automation, a network data collection and analysis function (NWDAF), which is a network function that provides a function to analyze and provide data collected in the 5G network, may be defined. NWDAF can collect/store/analyze information from the 5G network and provide the result to an unspecified network function (NF), and the analysis result can be used independently in each NF.

For convenience of description below, some terms and names defined in the 3GPP standard (standards of 5G, NR, LTE, or similar systems) may be used. However, the present disclosure is not limited by terms and names, and may be equally applied to systems conforming to other standards.

In addition, a term for identifying an access node used in the following description, a term for a network entity (network entity), a term for messages, a term for an interface between network entities, various identification information Terms and the like referring to them are exemplified for convenience of description. Therefore, it is not limited to the terms used in the present disclosure, and other terms referring to objects having equivalent technical meanings may be used.

Efforts are being made to develop an improved 5G communication system (NR, New Radio) to meet the increasing demand for wireless data traffic after the commercialization of the 4G communication system. In order to achieve high data rates, the 5G communication system is designed to enable resources in the very high frequency (mmWave) band (eg, the 28 GHz frequency band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, unlike LTE, the 5G communication system supports various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, including 15 kHz, and the Physical Control Channel uses Polar Coding. The data channel (Physical Data Channel) uses LDPC (Low Density Parity Check). In addition, CP-OFDM as well as DFT-S-OFDM are used as a waveform for uplink transmission. In LTE, HARQ (Hybrid ARQ) retransmission in units of TB (Transport Block) is resourced, whereas 5G may additionally support CBG (Code Block Group)-based HARQ retransmission in which a plurality of CBs (Code Blocks) are bundled.

In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, vehicle communication network (V2X (Vehicle to Everything) network), cooperative communication, Coordinated Multi-Points (CoMP), and reception Techniques such as interference cancellation are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. . The application of cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology. As described above, a plurality of services can be provided to a user in a communication system, and in order to provide such a plurality of services to a user, a method and an apparatus using the same are required to provide each service within the same time period according to characteristics. . Various services provided in the 5G communication system are being studied, and one of them is a service that satisfies the requirements for low latency and high reliability.

In the case of vehicle communication, in the NR V2X system, unicast communication, groupcast (or multicast) communication, and broadcast communication between the terminal and the terminal are supported. In addition, NR V2X is different from LTE V2X, which aims to transmit and receive basic safety information necessary for vehicle road driving. Together, we aim to provide more advanced services. In addition, the NR V2X system supports a method in which the terminal directly senses and allocates sidelink transmission resources in consideration of both periodic and aperiodic traffic. In addition, in the NR V2X system, already selected resources may be reselected through a re-evaluation process. In addition, when pre-emption is activated, even for resources that have already been reserved to ensure successful transmission of high-priority traffic or a terminal transmitting the same, resources according to the priority of the terminal and the RSRP (Reference Signal Received Power) measurement result. An operation of reselecting .

In particular, inter-UE coordination in the sidelink may be considered. Here, the cooperation between terminals may mean providing a more improved sidelink service by sharing information that can be helpful between terminals. In the present invention, information shared for cooperation between terminals is not limited to specific information. As such information, resource allocation information may be included. In general, the terminal performing transmission in the sidelink allocates resources through direct sensing and resource selection procedure (Mode2), or when the terminal performing transmission is within the coverage of the base station, the resource may be allocated from the base station (Mode1) ). However, a method in which the UE receives resource allocation and resource allocation related information from another UE through Inter-UE coordination may be additionally considered.

A method of receiving resource allocation and resource allocation related information from another terminal through cooperation between terminals may have the following advantages. First, there are cases in which it is more advantageous to be allocated resources from other terminals. For example, when considering a groupcast scenario, it is better for the leader terminal of the group to directly control the resource allocation of other terminals belonging to the group to provide resource allocation and resource allocation related information to other terminals belonging to the group. It can be advantageous for groupcast operation. In addition, when a terminal performing transmission is located outside the coverage of the base station and the terminal receiving it is located within the coverage of the base station, it is assumed that the base station can better allocate resources to the sidelink terminal by receiving information related to resource allocation from the terminals. , a method in which a terminal within coverage of a base station receives resource allocation information from a base station and transmits it to a terminal outside the coverage of the base station may be considered. In addition, rather than a method in which a terminal performing transmission allocates a resource through a direct sensing and resource selection procedure, a receiving terminal directs the resource allocation location to be received from the transmitting terminal through a direct sensing and resource selection procedure to the transmitting terminal. The method may provide improved resource allocation performance.

The second reason that it is more advantageous to receive resource allocation from another terminal is that if the terminal performing transmission is a terminal requiring low power consumption, such as a mobile terminal, power consumption of the terminal when another terminal performs resource allocation instead can be minimized. Note that a lot of power may be consumed for the UE to perform sensing to select a sidelink transmission resource. Therefore, in consideration of these advantages, UE and base station operations for sharing resource allocation related information by performing Inter-UE coordination should be defined. Therefore, the present disclosure proposes a method of what kind of information is required to perform inter-terminal cooperation and how such information can be indicated. In particular, a method for indicating resource allocation related information is provided.

Various embodiments of the present disclosure are proposed to support the above-described scenario, and in particular, a method for performing Inter-UE coordination in a sidelink, and a method and apparatus for providing resource allocation related information through this method and apparatus aims to provide

1 is a view showing a V2X system according to an embodiment of the present disclosure.

Referring to FIG. 1, (a) of FIG. 1 shows an example of a case (In-Coverage, IC) in which all V2X terminals (UE-1 and UE-2) are located within the coverage of the base station. All V2X terminals may receive data and control information from the base station through downlink (DL) or transmit data and control information through uplink (UL) to the base station. In this case, the data and control information may be data and control information for V2X communication. The data and control information may be data and control information for general cellular communication. In addition, V2X terminals may transmit/receive data and control information for V2X communication through a sidelink (SL).

Figure 1 (b) shows an example of a case in which the UE-1 is located within the coverage of the base station among V2X terminals and the UE-2 is located outside the coverage of the base station. That is, Figure 1 (b) shows an example of partial coverage (partial coverage, PC) in which some V2X terminals (UE-2) are located outside the coverage of the base station. A V2X terminal (UE-1) located within the coverage of the base station may receive data and control information from the base station through downlink or transmit data and control information through uplink to the base station. The V2X terminal (UE-2) located outside the coverage of the base station cannot receive data and control information through the downlink from the base station, and cannot transmit data and control information through the uplink to the base station. The V2X terminal UE-2 may transmit/receive data and control information for V2X communication through a sidelink with the V2X terminal UE-1.

Figure 1 (c) shows an example of a case where all V2X terminals are located outside the coverage of the base station (out-of coverage, OOC). Therefore, the V2X terminals (UE-1, UE-2) cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station. V2X terminals (UE-1, UE-2) may transmit/receive data and control information for V2X communication through a sidelink.

Figure 1 (d) shows an example of a scenario of performing V2X communication between V2X terminals (UE-1, UE-2) located in different cells. Specifically, (d) of FIG. 1 shows a case in which V2X terminals (UE-1, UE-2) are connected to different base stations (RRC connection state) or camping (RRC connection release state, that is, RRC idle state). show At this time, the V2X terminal (UE-1) may be a V2X transmitting terminal and the V2X terminal (UE-2) may be a V2X receiving terminal. Alternatively, the V2X terminal (UE-1) may be a V2X receiving terminal, and the V2X terminal (UE-2) may be a V2X transmitting terminal. The V2X terminal (UE-1) may receive a system information block (SIB) from the base station to which it is connected (or to which it is camping), and the V2X terminal (UE-2) is connected to (or by itself) It can receive SIB from another base station (which is camping). In this case, as the SIB, an existing SIB or a SIB defined separately for V2X may be used. In addition, the information of the SIB received by the V2X terminal (UE-1) and the information of the SIB received by the V2X terminal (UE-2) may be different from each other. Therefore, in order to perform V2X communication between terminals (UE-1, UE-2) located in different cells, information is unified or information about this is signaled and a method of interpreting SIB information transmitted from different cells is additionally required. may be

1 illustrates a V2X system composed of V2X terminals (UE-1, UE-2) for convenience of description, but communication between more V2X terminals is not limited thereto. In addition, the interface (uplink and downlink) between the base station and the V2X terminals may be named a Uu interface, and the sidelink between the V2X terminals may be named a PC5 interface. Therefore, in the present disclosure, these may be used interchangeably. Meanwhile, in the present disclosure, the terminal supports vehicle-to-vehicle communication (vehicular-to-vehicular, V2V), vehicle-to-pedestrian communication (vehicular-to-pedestrian, V2P) supporting vehicle or pedestrian handset (for example, , smartphones), vehicles supporting vehicle-to-network communication (vehicular-to-network, V2N), or vehicles supporting vehicle-to-infrastructure communication (vehicular-to-infrastructure, V2I). have. In addition, in the present disclosure, the terminal may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of the base station function and a part of the terminal function.

Further, according to an embodiment of the present disclosure, the base station may be a base station supporting both V2X communication and general cellular communication, or may be a base station supporting only V2X communication. In this case, the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Accordingly, in this specification, the base station may be referred to as an RSU.

2 is a diagram illustrating a V2X communication method performed through a sidelink according to an embodiment of the present disclosure.

Referring to (a) of Figure 2, UE-1 (201, for example, TX terminal) and UE-2 (202, for example, RX terminal) may perform one-to-one communication, which It can be called cast (unicast) communication.

Referring to (b) of FIG. 2 , the TX terminal and the RX terminal may perform one-to-many communication, and this may be referred to as a groupcast or multicast. In (b) of FIG. 2 , UE-1 211 , UE-2 212 , and UE-3 213 form one group (Group A) to perform groupcast communication. and UE-4 214, UE-5 215, UE-6 216, and UE-7 217 form another group (Group B) for groupcast communication can be performed. Each terminal performs groupcast communication only within a group to which it belongs, and communication between different groups may be performed through unicast, groupcast, or broadcast communication. Although it is illustrated that two groups (Group A, Group B) are formed in (b) of FIG. 2 , the present invention is not limited thereto.

Meanwhile, although not shown in FIG. 2 , V2X terminals may perform broadcast communication. Broadcast communication means a case in which all V2X terminals receive data and control information transmitted by a V2X transmitting terminal through a sidelink. As an example, when it is assumed that UE-1 211 in FIG. 2B is a transmitting terminal for broadcast, all terminals (UE-2 212 , UE-3 213 , UE -4 214 , UE-5 215 , UE-6 216 , and UE-7 217 ) may receive data and control information transmitted by UE-1 211 .

In NR V2X, support of a form in which a vehicle terminal transmits data to only one specific node through unicast and a form in which data is transmitted to a specific number of nodes through a groupcast can be considered, unlike in LTE V2X. For example, these unicast and group cast technologies can be usefully used in service scenarios such as platooning, which is a technology that connects two or more vehicles in a single network and moves them in a cluster. Specifically, unicast communication may be required for the purpose of controlling one specific node by the leader node of a group connected by group driving, and group cast communication may be required for the purpose of simultaneously controlling a group consisting of a number of specific nodes. have.

3 is a diagram illustrating a resource pool defined as a set (set) of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure.

In the resource pool, a resource granularity of the time axis may be a slot. In addition, the resource allocation unit on the frequency axis may be a sub-channel composed of one or more physical resource blocks (PRBs).

When the resource pool is allocated on time and frequency ( 310 ), the colored area indicates the area set as the resource pool on time and frequency. In this disclosure, an example of a case in which the resource pool is non-contiguously allocated in time is described, but the resource pool may be continuously allocated in time. In addition, although the present disclosure describes an example of a case in which the resource pool is continuously allocated on a frequency, a method in which the resource pool is non-contiguously allocated on a frequency is not excluded.

Referring to FIG. 3 , a case 320 in which a resource pool is non-contiguously allocated in time is illustrated. Referring to FIG. 3 , a case is shown in which the granularity of resource allocation in time consists of slots. Specifically, one slot composed of a plurality of OFDM symbols may be a basic unit of resource allocation on the time axis. In this case, all OFDM symbols constituting the slot may be used for sidelink transmission, and some OFDM symbols constituting the slot may be used for sidelink transmission. For example, a part of the slot may be used as a downlink/uplink used as a Uu interface between base station terminals. Referring to FIG. 3 , a colored slot indicates a slot included in a resource pool in time, and a slot allocated to the resource pool may be (pre-)configured by resource pool information in time. For example, the temporal resource pool information may be indicated by a bitmap through the SIB.

Referring to FIG. 3 , a physical slot 320 belonging to a resource pool that is non-contiguous in time may be mapped to a logical slot 321 . In general, a set (set) of slots belonging to a physical sidelink shared channel (PSSCH) resource pool may be represented by (t0, t1, ..., ti, ..., tTmax).

Referring to FIG. 3 , a case 330 in which a resource pool is continuously allocated on a frequency is illustrated.

Resource allocation on the frequency axis may be performed in units of sub-channels 331 . The subchannel 331 may be defined as a resource allocation unit on a frequency composed of one or more RBs. That is, the subchannel 331 may be defined as an integer multiple of RB. Referring to FIG. 3 , the subchannel 331 may be composed of five consecutive PRBs, and the subchannel size (sizeSubchannel) may be the size of five consecutive PRBs. However, the content shown in the drawings is only an example of the present disclosure, and the size of a subchannel may be set differently, and although it is common that one subchannel is configured as a continuous PRB, it is not necessarily configured as a continuous PRB. The subchannel 331 may be a basic unit of resource allocation for the PSSCH.

The startRB-Subchannel 332 may indicate the start position of the subchannel 331 on a frequency in the resource pool. When resource allocation is performed in units of subchannels 331 on the frequency axis, the RB index (startRB-Subchannel, 332) from which the subchannel 331 starts, information on how many RBs the subchannel 331 consists of (sizeSubchannel) , and through configuration information on the total number of subchannels 331 (numSubchannel), and the like, a resource on a frequency may be allocated. In this case, information on startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configured by frequency resource pool information. For example, the frequency resource pool information may be set and indicated through the SIB.

4 is a diagram illustrating a method for a base station to allocate transmission resources in a sidelink according to an embodiment of the present disclosure.

A method for the base station to allocate transmission resources in the sidelink will be referred to as Mode 1 hereinafter. Mode 1 may be a scheduled resource allocation method. Mode 1 may indicate a method in which the base station allocates resources used for sidelink transmission to RRC-connected terminals in a dedicated scheduling method. The method of Mode 1 can be effective for interference management and resource pool management because the base station can manage sidelink resources.

Referring to FIG. 4 , the transmitting terminal 401 and the receiving terminal 402 that are camping on 405 may receive a sidelink system information block (SL-SIB) from the base station 403 ( 410 ). Here, the receiving terminal 402 represents a terminal receiving data transmitted by the transmitting terminal 401 . The SL-SIB information includes sidelink resource pool information for sidelink transmission/reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carrier information for sidelink transmission/reception operating at different frequencies. can

When data traffic for V2X is generated in the transmitting terminal 401, the transmitting terminal 401 may be RRC-connected to the base station 403 (420). Here, the RRC connection between the terminal and the base station may be referred to as Uu-RRC. The Uu-RRC connection process 420 may be performed before data traffic generation of the transmitting terminal 401 . Also, in Mode 1, in a state in which the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is performed, the transmitting terminal may transmit to the receiving terminal through a sidelink. Contrary to this, in Mode 1, even when the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is not performed, the transmitting terminal can transmit to the receiving terminal through the sidelink.

The transmitting terminal 401 may request a transmission resource capable of performing V2X communication with the receiving terminal 402 from the base station (430). In this case, the transmitting terminal 401 may request a sidelink transmission resource from the base station 403 by using an uplink physical uplink control channel (PUCCH), an RRC message, or a MAC CE. On the other hand, the MAC CE may be a buffer status report (BSR) MAC CE of a new format (at least an indicator indicating that it is a buffer status report for V2X communication and information on the size of data buffered for D2D communication). have. Also, the transmitting terminal 401 may request a sidelink resource through a scheduling request (SR) bit transmitted through an uplink physical control channel.

Next, the base station 403 may allocate a V2X transmission resource to the transmission terminal 401 . In this case, the base station may allocate transmission resources in a dynamic grant or configured grant method.

First, in the case of the dynamic grant method, the base station may allocate resources for transport block (TB) transmission through downlink control information (DCI). The sidelink scheduling information included in DCI may include parameters related to transmission time and frequency allocation location information fields of initial transmission and retransmission. DCI for the dynamic grant scheme may be CRC scrambled with SL-V-RNTI to indicate that it is a dynamic grant scheme.

Next, in the case of the configured grant method, the base station may periodically allocate resources for TB transmission by setting a semi-persistent scheduling (SPS) interval through Uu-RRC. In this case, the base station may allocate resources for one TB through DCI. The sidelink scheduling information for one TB included in DCI may include parameters related to transmission time and frequency allocation location information of initial transmission and retransmission resources. When resources are allocated in the configured grant method, the transmission time (occasion) and frequency allocation location of the initial transmission and retransmission for one TB may be determined by the DCI, and the resource for the next TB may be repeated at SPS interval intervals. have. DCI for the configured grant method may be CRC scrambled with SL-SPS-V-RNTI to indicate that it is a configured grant method. In addition, the configured grant (CG) method can be divided into type1 CG and type2 CG. In the case of Type2 CG, it is possible to activate / deactivation a resource set as a grant configured through DCI.

Accordingly, in the case of Mode 1, the base station 403 may instruct the transmitting terminal 401 to schedule for sidelink communication with the receiving terminal 402 through DCI transmission through the PDCCH (440).

Specifically, DCI format 3_0 or DCI format 3_1 may be used as downlink control information (DCI) used by the base station 403 for sidelink communication with the transmitting terminal 401 . DCI format 3_0 may be defined as a DCI for scheduling an NR sidelink in one cell, and DCI format 3_1 may be defined as a DCI for scheduling an LTE sidelink in one cell.

More specifically, DCI format 3_0 includes at least one of the information described below so that the base station 403 may indicate to the transmitting terminal 401 . The terminal may receive the DCI format 3_0 from the base station to determine scheduling information for sidelink transmission.

* Resource pool index

비트 정보가 포함될 수 있다. 여기서 I 는 상위 레이어로 설정된 전송 자원 풀의 수를 나타내며, 하나의 자원 풀만 설정될 경우에는 0 bit로 설정될 수 있다. 만약 다수의 자원 풀이 설정되는 경우에 자원 풀에 따라 가장 많은 정보량이 필요한 자원 풀을 기준으로 나머지 자원 풀에 대해서는 아래 padding bits를 제외한 나머지 필드를 구성한 뒤에 zero 비트가 패딩 될 수 있다.: When multiple resource pools are configured, the base station may indicate the selected pool.

Bit information may be included. Here, I represents the number of transmission resource pools configured as a higher layer, and may be set to 0 bit when only one resource pool is configured. If multiple resource pools are configured, zero bits may be padded after configuring the remaining fields except for the padding bits below for the remaining resource pools based on the resource pool requiring the largest amount of information according to the resource pool.

* time gap

: It may indicate a time interval for receiving DCI and performing sidelink transmission. It may consist of 3-bit information, and a corresponding value may be set to a higher layer.

* HARQ process ID

비트 정보가 포함될 수 있다. 여기서

는 HARQ process 수를 나타낸다.: Can indicate HARQ process ID.

Bit information may be included. here

represents the number of HARQ processes.

* new data indicator

: Whether it is a new TB (Transport Block) may be indicated. It may be composed of 1-bit information.

* Lowest index of the subchannel allocation to the initial transmission

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 서브채널의 수를 나타낸다.: May indicate a resource allocation position (lowest subchannel index) for initial transmission.

Bit information may be included. here

indicates the number of subchannels configured in the resource pool.

* Sidelink Control Information (SCI) format 1-A fields of frequency and time resource assignment

: Frequency and time resource allocation information indicated by SCI format 1-A may be indicated. Whether the maximum number of transmission reservation resources set in the upper layer (resource pool) is 2 or 3 may be set, and accordingly, the number of bits used for frequency and time resources may be determined. For details, refer to frequency and time resource allocation information indicated by SCI format 1-A below.

* PSFCH-to-HARQ feedback timing indicator

비트 정보가 포함될 수 있다. 여기서

는 상위 레이어로 설정된 entry의 수를 나타내며, 하나의 entry만 설정될 경우에는 0 bit로 설정될 수 있다. : The UE may indicate a time interval for receiving the PSFCH and reporting the HARQ feedback to the base station.

Bit information may be included. here

indicates the number of entries set to the upper layer, and may be set to 0 bit when only one entry is set.

* PUCCH resource indicator

: The UE may indicate a PUCCH resource that receives the PSFCH and reports HARQ feedback to the base station. It may be composed of 3-bit information.

* Configuration index

: A configuration index may be indicated for CG (Configured Grant) type2. It may be composed of 3-bit information.

* Counter sidelink assignment index

: The terminal may indicate a codebook for receiving the PSFCH and reporting HARQ feedback to the base station. Type1/Type2 sidelink HARQ-ACK codebook may be supported and may consist of 2-bit information.

* Padding bits, if required

: Zero bits can be padded to match other DCI formats and sizes.

In the present disclosure, information that can be included in DCI format 3_0 is not limited to the information presented above.

In the case of broadcast transmission, the transmitting terminal 401 may perform transmission without the RRC setting 415 for the sidelink. Contrary to this, in the case of unicast or groupcast transmission, the transmitting terminal 401 may perform RRC connection with another terminal on a one-to-one basis. Here, the RRC connection between terminals may be referred to as a PC5-RRC 415 to be distinguished from the Uu-RRC. In the case of groupcast, the PC5-RRC 415 may be individually connected between the terminals in the group and the terminals. Referring to FIG. 4 , although the connection of the PC5-RRC 415 is shown as an operation after the transmission 410 of the SL-SIB, it may be performed at any time before the transmission 410 of the SL-SIB or before the transmission of the SCI.

^{Next, the transmitting terminal 401 may transmit a 1st} stage (SCI) to the receiving terminal 402 through the PSCCH ( 460 ). It may also send a transmission terminal 401 SCI (2 ^nd stage) to the receiving terminal 402 through a PSSCH (470). The 1 ^st stage, the SCI, the information related to the resource allocation and the 2 ^nd stage SCI may include control information other than that. Also, the transmitting terminal 401 may transmit data to the receiving terminal 402 through the PSSCH (480). In this case, 1 ^st stage (SCI), 2 ^nd stage (SCI), and PSSCH may be transmitted together in the same slot.

5 is a diagram illustrating a method in which a terminal directly allocates a transmission resource of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure. Hereinafter, a method in which the terminal directly allocates the transmission resource of the sidelink through sensing in the sidelink will be referred to as Mode 2. In the case of Mode 2, it may also be referred to as UE autonomous resource selection. In Mode 2, the base station 503 may provide a sidelink transmission/reception resource pool for V2X as system information, and the transmission terminal 501 may select a transmission resource according to a predetermined rule. Unlike Mode 1 in which the base station directly participates in resource allocation, there is a difference in that the transmitting terminal 501 autonomously selects resources and transmits data based on a resource pool previously received through system information in FIG. 5 .

Referring to FIG. 5 , a transmitting terminal 501 and a receiving terminal 502 that are camping on 505 may receive an SL-SIB from a base station 503 ( 510 ). Here, the receiving terminal 502 represents a terminal receiving data transmitted by the transmitting terminal 501 . The SL-SIB information includes sidelink resource pool information for sidelink transmission/reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carrier information for sidelink transmission/reception operating at different frequencies. can

The difference between FIG. 4 and FIG. 5 is that in FIG. 4, the base station 403 and the terminal 401 operate in an RRC connected state, whereas in FIG. 5, the terminal operates in an idle mode 520 (not RRC connected). state) can also work. In addition, even in the RRC connected state 520 , the base station 503 may allow the transmitting terminal 501 to autonomously select a transmission resource without directly participating in resource allocation. Here, the RRC connection between the terminal 501 and the base station 503 may be referred to as a Uu-RRC 520 . When data traffic for V2X is generated in the transmitting terminal 501, the transmitting terminal 501 sets a resource pool through the system information received from the base station 503, and the transmitting terminal 501 senses within the set resource pool. It is possible to directly select a resource in the time/frequency domain through (530).

In the case of broadcast transmission, the transmitting terminal 501 may perform transmission without the RRC setting 515 for the sidelink. Contrary to this, in the case of unicast or groupcast transmission, the transmitting terminal 501 may perform RRC connection with another terminal on a one-to-one basis. Here, the RRC connection between terminals may be referred to as a PC5-RRC 515 to be distinguished from the Uu-RRC. In the case of groupcast, the PC5-RRC 515 may be individually connected between the terminals in the group and the terminals. Referring to FIG. 5 , although the connection of the PC5-RRC 515 is shown as an operation after the transmission 510 of the SL-SIB, it may be performed at any time before the transmission 510 of the SL-SIB or before the transmission of the SCI.

^{Next, the transmitting terminal 501 may transmit a 1st} stage (SCI) to the receiving terminal 502 through the PSCCH ( 550 ). It may also send a transmission terminal 401 SCI (2 ^nd stage) to the receiving terminal 402 through a PSSCH (560). The 1 ^st stage, the SCI, the information related to the resource allocation and the 2 ^nd stage SCI may include control information other than that. Also, the transmitting terminal 501 may transmit data to the receiving terminal 502 through the PSSCH ( 570 ). In this case, 1 ^st stage (SCI), 2 ^nd stage (SCI), and PSSCH may be transmitted together in the same slot.

Specifically, the SCI used by the transmitting terminals 401 and 501 for sidelink communication to the receiving terminals 402 and 502 may be SCI format 1-A as ^{1 st stage (SCI).} There may also be a ^{SCI (2 nd stage) SCI format} 2-A or 2-B SCI format. ^{SCI (2 nd stage) SCI format} 2-A in the can be used includes the information for decoding PSSCH if when the HARQ feedback is used that is not used or is used and HARQ feedback includes both the ACK or NACK information. In contrast, SCI format 2-B may include information for PSSCH decoding when HARQ feedback is not used or when HARQ feedback is used and only NACK information is included. For example, SCI format 2-B may be limitedly used for groupcast transmission.

More specifically, SCI format 1-A may include at least one of the information described below so that the transmitting terminals 401 and 501 may indicate to the receiving terminals 402 and 502 .

* Priority

: As information indicating priority, it may be composed of 3-bit information.

* Frequency resource assignment

비트 정보가 포함될 수 있다. 상위 레이어(자원 풀)로 설정된 최대 전송 예약 자원의 수가 3인 경우에,

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 서브채널의 수를 나타낸다.: When the number of maximum transmission reservation resources set to the upper layer (resource pool) as information for indicating the frequency resource allocation location is 2,

Bit information may be included. When the number of maximum transmission reservation resources set to the upper layer (resource pool) is 3,

Bit information may be included. here

indicates the number of subchannels configured in the resource pool.

* Time resource assignment

: When the number of maximum transmission reservation resources set to a higher layer (resource pool) as information for indicating a resource allocation position in time is 2, 5-bit information may be included. 9-bit information may be included when the maximum number of transmission reservation resources set to a higher layer (resource pool) is 3.

* Resource reservation period

비트 정보가 포함될 수 있다. 여기서

는 상위 레이어(자원 풀)에 설정된 주기 값의 수를 나타낸다. 만약 상위 레이어(자원 풀)에 해당 값이 설정되지 않은 경우에는 주기적인 자원 예약을 하지 않는 것으로 판단하며 0 bit로 설정될 수 있다.: Information to indicate periodic resource reservation

Bit information may be included. here

indicates the number of period values set in the upper layer (resource pool). If the corresponding value is not set in the upper layer (resource pool), it is determined that periodic resource reservation is not performed and may be set to 0 bit.

* DMRS pattern

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 DMRS 패턴의 수를 나타낸다. 만약 하나의 패턴이 설정된 경우에 0 bit로 설정될 수 있다.: It can indicate which DMRS pattern is transmitted among the DMRS patterns set in the upper layer (resource pool).

Bit information may be included. here

indicates the number of DMRS patterns set in the resource pool. If one pattern is set, it may be set to 0 bit.

* 2nd-stage SCI format

Cognitive 2 ^nd -stage SCI format the SCI format 2-A 2-B can be that the SCI format line directed. 2-bit information may be included, and bits reserved in consideration of the introduction of another 2nd-stage SCI format in the future may be included.

* Beta_offset indicator

: It may be indicated to determine the RE mapping the 2 ^nd -stage SCI. Two bits of information may be included.

* Number of DMRS port

: Whether the number of DMRS ports is 1 or 2 may be indicated. 1-bit information may be included.

* Modulation and coding scheme

: MCS can be instructed. 5 bits of information may be included.

* Additional MCS table indicators

: When a plurality of MCS tables are configured in a higher layer, which MCS table is used may be indicated. When only one MCS table is configured in the upper layer, it may be set to 0 bit.

* PSFCH overhead

: It may be indicated to determine the PSCCH TBS. When the PSFCH period is 2 or 4, 1-bit information may be included, and when the PSFCH period is 0 or 1, it may be set to 0 bit.

* Reserved bits

: Bits reserved for future use may be set, and the number of bits may be determined by a higher layer setting.

Next, SCI format 2-A may include at least one of the information described below so that the transmitting terminals 401 and 501 may indicate to the receiving terminals 402 and 502 .

* HARQ process ID

비트 정보가 포함될 수 있다. 여기서

는 HARQ process 수를 나타낸다.: Can indicate HARQ process ID.

Bit information may be included. here

represents the number of HARQ processes.

* new data indicator

: Whether it is a new TB (Transport Block) may be indicated. It may be composed of 1-bit information.

* Redundancy version

: It may indicate a redundancy version value, which is channel coding information, and may include 2-bit information.

* Source ID

: A unique Source ID of control information and data or an ID of a transmitting terminal may be indicated, and 8-bit information may be included.

* Destination ID

: A unique destination ID of control information and data or an ID of a receiving terminal may be indicated, and 16-bit information may be included.

* CSI request

: It may indicate a CSI report request and may consist of 1-bit information.

* HARQ feedback enabled/disabled

: HARQ feedback may indicate activation/deactivation and may consist of 1-bit information.

* Cast type indicator

: It can indicate whether the transmission type is broadcast, unicast, or groupcast, and can be composed of 2-bit information.

Next, SCI format 2-B includes at least one of the information described below so that the transmitting terminals 401 and 501 may indicate to the receiving terminals 402 and 502 .

* HARQ process ID

비트 정보가 포함될 수 있다. 여기서

는 HARQ process 수를 나타낸다.: Can indicate HARQ process ID.

Bit information may be included. here

represents the number of HARQ processes.

* new data indicator

: Whether it is a new TB (Transport Block) may be indicated. It may be composed of 1-bit information.

* Redundancy version

: It may indicate a redundancy version value, which is channel coding information, and may include 2-bit information.

* Source ID

: A unique Source ID of control information and data or an ID of a transmitting terminal may be indicated, and 8-bit information may be included.

* Destination ID

: A unique destination ID of control information and data or an ID of a receiving terminal may be indicated, and 16-bit information may be included.

* Zone ID

: The location information of the transmitting terminal may be indicated in the form of a zone and may include 12 bits of information.

* Communication range requirement

: Communication range information for determining whether to perform HARQ feedback may be included, and may include 4-bit information.

* HARQ feedback enabled/disabled

: HARQ feedback may indicate activation/deactivation and may consist of 1-bit information.

In various embodiments of the present disclosure, information that may be included in SCI format 1-A, SCI format 2-A, and SCI format 2-B is not limited to the information presented above.

6 is a diagram illustrating a mapping structure of physical channels mapped to one slot in a sidelink according to an embodiment of the present disclosure.

Specifically, the mapping for PSCCH/PSSCH/PSFCH physical channels is shown in FIG. 6 . PSCCH/PSSCH/PSFCH may be allocated to one or more subchannels in terms of frequency. For details on sub-channel allocation, refer to the description of FIG. 3 . Next, referring to FIG. 6 to describe the temporal mapping of PSCCH/PSSCH/PSFCH, one or more symbols before the transmitting terminal transmits PSCCH/PSSCH/PSFCH in the corresponding slot 601 are to the area 602 for AGC. can be used When the corresponding symbol(s) is used for AGC, a method of repeating and transmitting signals of other channels in the corresponding symbol region may be considered. In this case, a part of a PSCCH symbol or a PSSCH symbol may be considered as a repeated signal of another channel. Alternatively, the preamble may be transmitted in an automatic gain control (AGC) region. When the preamble signal is transmitted, there is an advantage in that the AGC execution time can be further shortened compared to the method of repeatedly transmitting signals of other channels. When a preamble signal is transmitted for AGC, a specific sequence may be used as the preamble signal 602, and in this case, a sequence such as PSSCH DMRS, PSCCH DMRS, CSI-RS may be used as the preamble. The sequence used as the preamble in the present disclosure is not limited to the above-described example.

Additionally, according to FIG. 6 , the PSCCH 603 including control information may be transmitted in the initial symbols of the slot, and data scheduled by the control information of the PSCCH 603 may be transmitted to the PSSCH 604 . A part (1st stage SCI) of sidelink control information (SCI), which is control information, may be mapped and transmitted to the PSCCH 603 . In the PSSCH 604, not only data information but also another part (2nd stage SCI) of SCI, which is control information, may be mapped and transmitted. In addition, FIG. 6 shows that a physical sidelink feedback channel (PSFCH 605), which is a physical channel for transmitting feedback information, is located in the last part of the slot. It is possible to secure a predetermined empty time gap between the PSSCH 604 and the PSFCH 605 so that a terminal that has transmitted and received the PSSCH 604 can prepare to transmit or receive the PSFCH 605 . . In addition, after transmission and reception of the PSFCH 605, an empty interval (Gap) may be secured for a predetermined time.

In various embodiments below, it is intended to propose a procedure in which a UE performs resource selection in a sidelink in consideration of Inter-UE coordination. First, in the first embodiment, an overall procedure for how and when cooperation between terminals can be performed in the sidelink will be described. The second embodiment proposes a method in which a base station indicates resource selection information for another terminal to a coordinator UE. The third embodiment proposes a method in which a coordinator UE indicates resource selection information to another UE. And in the fourth embodiment, the overall terminal operation will be described with reference to the drawings. In the present disclosure, the following embodiments may be used in combination with each other.

In the first embodiment, a specific scenario for inter-UE coordination in the sidelink is presented through drawings. And the overall procedure for how and when cooperation between terminals can be performed is described. Here, the terminal may be a vehicle terminal and a pedestrian terminal.

7 is a diagram illustrating a scenario of performing Inter-UE coordination according to the present embodiment. Here, cooperation between terminals may mean providing an improved sidelink service by sharing information that can be helpful between terminals. In the present disclosure, information shared for cooperation between terminals is not limited to specific information. As such information, resource allocation information may be included. In general, when a terminal performing transmission in the sidelink allocates a resource through a direct sensing and resource selection procedure (Mode2), or when a terminal performing transmission is within the coverage of a base station (BS), a resource from the base station Can be assigned (Mode1). However, a method in which the UE receives resource allocation and resource allocation related information from another UE through Inter-UE coordination may be additionally considered. It has been described above that a situation may arise in which cooperation between terminals is helpful.

Referring to FIG. 7 , a scenario in which Inter-UE coordination is performed in a sidelink is illustrated. In FIG. 7 , UE-A corresponds to a terminal that provides resource allocation related information to UE-B, and UE-B corresponds to a terminal that receives resource allocation related information from UE-A and performs sidelink transmission. In this case, UE-B may receive assistance in performing sidelink transmission by receiving resource allocation related information from UE-A. In more detail, the resource allocation related information may be provided as one or more resource set information. Here, the resource set information may mean a resource pool that is a time and frequency domain from which resources can be selected in the sidelink, or may be time-frequency resource allocation information selected for actual resource transmission in the resource pool. If actual resource allocation information is provided, prior information necessary for UE-A to provide such information to UE-B needs to be shared between UE-A and UE-B. Specifically, when UE-A provides resource allocation information for UE-B, UE-A transmits resource pool (TX pool) information used by UE-B, resource configuration information of UE-B, and UE-B. Information such as a CBR measurement result may be additionally provided. For example, assuming that the transmission resource pool (TX pool) used by UE-B is resource pool A, UE-A must provide the resource selected from resource pool A to UE-B. Also, note that when UE-B is provided with resource allocation related information from UE-A in FIG. 7 , UE-B may or may not use the resource allocation information provided from UE-A. Also, the terminals illustrated in FIG. 7 may be terminals providing resource allocation information, such as UE-A, or terminals receiving resource allocation information, such as UE-B. However, it is noted that it is not necessary for all UEs to be a UE providing resource allocation information such as UE-A or a UE providing resource allocation information such as UE-B.

Hereinafter, an overall procedure for when and how Inter-UE coordination can be performed in the sidelink according to the present disclosure will be described.

First, as described above, it is not necessary for all terminals performing transmission and reception in the sidelink to perform Inter-UE coordination. Therefore, whether or not cooperation between terminals is supported (enable/disable) may be determined. For this, whether or not cooperation between terminals is supported for each resource pool may be (pre-)configured in the resource pool. In this case, if the network enables the inter-terminal cooperation support to the upper layer or if the pre-configured value for inter-terminal cooperation support is enabled in the terminal, the inter-terminal cooperation is performed in the corresponding resource pool. can be In the present disclosure, the method for determining whether inter-terminal cooperation is supported is not limited thereto. For example, a method of signaling enable and disable through PC5-RRC, Sidelink MAC-CE, SCI, etc. may be considered. It may also be achieved by a combination of one or more of the above methods.

Next, the terminal may report the terminal capability of whether it can support Inter-UE coordination to a base station (BS) or another terminal. For example, additional terminal processing may be required in order for a terminal to provide resource allocation related information to another terminal through cooperation between terminals as described with reference to FIG. 7 . Therefore, the terminal may perform an operation of reporting the terminal capability of whether to support inter-terminal cooperation to the base station through Uu-RRC or to another terminal through PC5-RRC. Through this, the base station will be able to determine the possibility of cooperation between terminals by identifying the capability of the corresponding terminal. In addition, through this, the terminal may determine the capability of another terminal, determine whether cooperation between the terminal and the terminal is possible, and determine whether to request resource allocation related information.

Therefore, according to the proposed procedure, when one or more of the following conditions are satisfied, Inter-UE coordination may be possible in the sidelink. First, support for inter-terminal cooperation in the sidelink must be enabled. In addition, when the report on the terminal capability for cooperation between terminals is supported, the corresponding terminal capability should be able to support the cooperation between terminals.

A terminal that provides resource allocation related information to another terminal through cooperation between terminals when inter-UE coordination is possible in the sidelink is referred to as a coordinator UE in this specification. Note that the coordinator UE may be replaced with other terms representing the same meaning. For example, in the case of groupcast, a leader UE may be a coordinating terminal. Specifically, in FIG. 7 , UE-A is illustrated as a coordinating terminal. As described with reference to FIG. 7 , one or more terminals shown in FIG. 7 may have a qualification to perform the role of a coordinating terminal. However, it is not necessary for all terminals having the qualification to perform the role of the coordinating terminal to be the coordinating terminal. Accordingly, the coordinating terminal may be selected as needed. In other words, the role of the coordinating terminal may be performed without performing the role of the coordinating terminal, and conversely, the role of the coordinating terminal may not be performed while performing the role of the coordinating terminal. The selection of the coordinating terminal may be determined by a higher layer. However, the method of selecting a coordinating terminal in the present disclosure is not limited thereto.

In addition, when inter-UE coordination is possible in the sidelink and a coordinator UE is determined, information necessary for inter-UE coordination may be shared between the coordinating terminal and other terminals. Referring to the description related to FIG. 7, when the coordinating terminal provides resource allocation related information to another terminal, it is explained that transmission resource pool information needs to be shared between the coordinating terminal and the other terminal. did This is because the transmission resource pool (TX pool) set to the coordinating terminal and the transmission resource pool (TX pool) set to the other terminal may be different from each other. If, in order for the coordinating terminal to provide resource allocation information to another terminal, the other terminal needs to know if the transmission resource pool (TX pool) is the same as the transmission resource pool of the coordinating terminal, or otherwise, information about it. If a plurality of transmission pools are configured in other terminals, the coordinating terminal may provide a preferred transmission pool among the plurality of transmission pools to other terminals. In addition, the coordinating terminal may provide the time-frequency resource allocation information selected for actual resource transmission in the transmission resource pool of the other terminal to the other terminal. In this way, in order for the coordinating terminal to know the transmission resource pool information of other terminals and to perform inter-terminal cooperation, the coordinating terminal directs the transmission resource pool to be used by other terminals to other terminals, or the transmission resource pool to be used by other terminals. Information is directed to the coordinating terminal, or transmission resource pool information needs to be shared between the coordinating terminal and other terminals. And it may be assumed that cooperation between terminals is performed in the corresponding transmission resource pool.

When Inter-UE coordination is enabled and a coordinator UE is determined, information necessary for inter-terminal cooperation between the coordinating terminal and other terminals is not limited to the resource pool information presented above. For example, information such as resource configuration information of other terminals and CBR measurement results may be shared with each other. Such information exchange may be performed through PC5-RRC when a PC5-RRC connection between terminals is made. In the present disclosure, the method of exchanging information necessary for cooperation between terminals is not limited to PC5-RRC. For example, a method in which necessary information is signaled through Sidelink MAC-CE, SCI, etc. may be considered. It may also be achieved by a combination of one or more of the above methods. A method of indicating such information will be described in more detail below.

Next, when inter-UE coordination is possible in the sidelink, a coordinator UE is determined, and information necessary for inter-terminal cooperation is shared between the coordinating terminal and other terminals, the coordinating terminal The following method may be considered as a method for a terminal to provide resource allocation related information to another terminal through cooperation between terminals.

* Method 1: The base station may indicate resource allocation information of another terminal to the coordinating terminal, and the coordinating terminal may provide it to the other terminal.

* Method 2: The coordinating terminal may directly perform a sensing and resource selection (Mode2) procedure to select a resource for another terminal and provide it to another terminal.

* Method 3: When the coordinating terminal requests resource allocation to the base station, the base station may directly indicate resource allocation information to the sidelink terminal(s).

In the case of method 1, it may be possible when the coordinating terminal is within the base station coverage. Also, resource allocation related information shared by the coordinating terminal from other terminals may be reported to the base station through Uu-RRC. When the other terminal is out of the base station coverage, it requests resource allocation information from the coordinating terminal (which may be considered PC5-RRC, sidelink MAC CE, SCI, etc.), and the coordinating terminal asks the base station again for resource allocation information for other terminals may be requested (this may be considered Uu-RRC, Uu MAC CE, etc.). When the coordinating terminal receives resource allocation information for another terminal from the base station, it may provide this information to other terminals as it is, or the coordinating terminal may provide resource allocation information determined by referring to this information to the other terminal.

In contrast, in the case of method 2, the coordinating terminal directly performs sensing and resource selection (Mode2) procedure to select a resource for another terminal and provides it to another terminal, so the location of the coordinating terminal (within the base station coverage) It can be supported regardless of whether or not

In the case of method 3, it may be possible when the coordinating terminal is within the base station coverage. Also, resource allocation related information shared by the coordinating terminal from other terminals may be reported to the base station through Uu-RRC. When the other terminal is out of the base station coverage, it requests resource allocation information from the coordinating terminal (which may be considered PC5-RRC, sidelink MAC CE, SCI, etc.), and the coordinating terminal asks the base station again for resource allocation information for other terminals may be requested (this may be considered Uu-RRC, Uu MAC CE, etc.). In the case of method 3, compared to method 1, there is no need for the coordinating terminal to transmit resource allocation related information of another terminal received from the base station to another terminal. In other words, the base station may directly indicate resource allocation related information to the sidelink terminal(s). For a detailed instruction method for this, refer to the example below.

Hereinafter, a method of indicating related information when the methods 1 to 3 are supported will be described in more detail.

The present disclosure proposes a method of indicating information for performing cooperation between terminals. In particular, a method for indicating resource allocation related information is provided. Information exchange for inter-UE coordination of the sidelink between the coordinating terminal and the base station may be accomplished through the following signaling method.

Signaling method between base station terminals

* Method 1: Uu-RRC

* Method 2: Uu MAC-CE

* Method 3: DCI

* Combination of the above methods

In addition, information exchange for inter-UE coordination in the sidelink between the UE and the UE may be performed through the following signaling method.

Signaling method between terminals

* Method 1: PC5-RRC

* Method 2: Sidelink MAC-CE

* Method 3: SCI

* Combination of the above methods

However, in the present disclosure, the method of indicating information for performing cooperation between terminals is not limited thereto.

In the second embodiment, when the coordinator UE is within the base station coverage, information for supporting inter-UE coordination of the sidelink is directed from the base station to the coordinator terminal or another terminal. . Note that the present disclosure is not limited to the information provided below as the corresponding information. First, the following information may be considered as resource selection related information indicated by the base station for cooperation between terminals. It is also noted that one or more of the information below may be considered.

* Resource pool index 2

비트 정보가 포함될 수 있다. 여기서 I 는 상위 레이어로 설정된 전송 자원 풀의 수를 나타내며, 하나의 자원 풀만 설정될 경우에는 0 bit로 설정될 수 있다. 만약 다수의 자원 풀이 설정되는 경우에 자원 풀에 따라 가장 많은 정보량이 필요한 자원 풀을 기준으로 나머지 자원 풀에 대해서는 아래 padding bits를 제외한 나머지 필드를 구성한 뒤에 zero 비트가 패딩 될 수 있다.: The above information is similar to the resource pool index described in DCI format 3_0, but the base station is to indicate the resource pool information to be used by the coordinating terminal and another terminal performing cooperation between the terminal. Therefore, when a plurality of resource pools are configured, the base station may indicate the pool selected for the coordinating terminal and another terminal performing cooperation between the terminals. For example,

Bit information may be included. Here, I represents the number of transmission resource pools configured as a higher layer, and may be set to 0 bit when only one resource pool is configured. If multiple resource pools are configured, zero bits may be padded after configuring the remaining fields except for the padding bits below for the remaining resource pools based on the resource pool requiring the largest amount of information according to the resource pool.

* time gap

: It may indicate a time interval for receiving DCI and performing sidelink transmission. For example, it may be composed of 3-bit information and a corresponding value may be set as an upper layer.

이후의 첫 사이드링크 슬롯에서 사이드링크 전송을 수행할 수 있다. 여기서

는 DCI를 송수신하는 슬롯의 시작 시점을 나타낼 수 있다.

는 Time advance관련 값을 나타낼 수 있다.

는 상기 time gap에 해당되는 값을 나타낼 수 있다. 그리고

는 사이드링크 슬롯의 duration을 나타낼 수 있다.The coordinating terminal receives the information and

Sidelink transmission may be performed in a subsequent first sidelink slot. here

may indicate a start time of a slot for transmitting and receiving DCI.

may indicate a value related to time advance.

may represent a value corresponding to the time gap. and

may indicate the duration of the sidelink slot.

* Time gap2

: The information is to indicate a time interval during which the other terminal receives the SCI and performs sidelink transmission when the coordinating terminal indicates resource allocation related information to another terminal. The indication may be composed of X-bit information, and the corresponding value may be set to a higher layer.

이후의 첫 사이드링크 슬롯에서 사이드링크 전송을 수행할 수 있다. 여기서

는 조정 단말로부터 SCI를 송수신하는 슬롯의 시작 시점을 나타낼 수 있다.

는 상기 Time gap2에 해당되는 값을 나타낼 수 있다. 그리고

는 사이드링크 슬롯의 duration을 나타낼 수 있다.The terminal receiving the information from the coordinating terminal

Sidelink transmission may be performed in a subsequent first sidelink slot. here

may indicate a start time of a slot for transmitting and receiving SCI from the coordinating terminal.

may represent a value corresponding to the time gap2. and

may indicate the duration of the sidelink slot.

* Lowest index 2 of the sub-channel for initial transmission

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 서브채널의 수를 나타낸다.: The above information is similar to the lowest index of the sub-channel for initial transmission described in DCI format 3_0, but is intended to indicate the location information of the sub-channel used for transmission of the coordinating terminal and another terminal performing cooperation between the terminals. A resource allocation position (lowest subchannel index) for initial transmission may be indicated. For example,

Bit information may be included. here

indicates the number of subchannels configured in the resource pool.

* Frequency and time resource assignment

: The coordinating terminal may indicate frequency and time resource allocation information to another terminal. For example, whether the maximum number of transmission reservation resources set to the upper layer (resource pool) is 2 or 3 may be set, and accordingly, the number of bits used for frequency and time resources may be determined. For details, refer to Example 3 below.

* Resource reservation period

비트 정보가 포함될 수 있다. 여기서

는 상위 레이어(자원 풀)에 설정된 주기 값의 수를 나타낼 수 있다. 만약 상위 레이어(자원 풀)에 해당 값이 설정되지 않은 경우에는 주기적인 자원 예약을 하지 않는 것으로 판단하며 0 bit로 설정될 수 있다.: Information for the base station to indicate periodic resource reservation of another terminal to the coordinating terminal, for example,

Bit information may be included. here

may indicate the number of period values set in the upper layer (resource pool). If the corresponding value is not set in the upper layer (resource pool), it is determined that periodic resource reservation is not performed and may be set to 0 bit.

Note that, in addition to the above information, information useful for inter-terminal cooperation may be indicated from the base station to the coordinating terminal. In addition, the following information included in the DCI format 3_0 may be additionally considered.

* HARQ process ID

* new data indicator

* PSFCH-to-HARQ feedback timing indicator

* PUCCH resource indicator

* Counter sidelink assignment index

At this time, the information of the PSFCH-to-HARQ feedback timing indicator, PUCCH resource indicator, and Counter sidelink assignment index is that the coordinating terminal receives data transmitted by another terminal performing inter-terminal cooperation, and reports the HARQ-ACK feedback to the base station. It may be setting information for Therefore, it is noted that information included in DCI format 3_0 and a corresponding subject can be distinguished. As a method of indicating information presented for cooperation between terminals in the second embodiment, the signaling method between base station terminals in the first embodiment may be applied. If the coordinating terminal receives the resource allocation related information for another terminal from the base station through DCI as in Method 3 of the first embodiment, it needs to be indicated separately from DCI format 3_0. Specifically, it is necessary for the terminal to distinguish whether the DCI received from the base station is for scheduling sidelink transmission of the terminal that has received it, or is for scheduling sidelink transmission of another terminal from the terminal that has received the DCI. As a method for this, the following method may be considered. The present disclosure is not limited only to the following method.

* Method 1: DCI format 3_0 using different CRC scrambling (ex, SL-RNTI-2)

* Method 2: New DCI format (ex, DCI format 3_X)

According to the method 1, DCI format 3_0 is used and a new RNTI (eg, SL-RNTI-2) that is differentiated from the previously used RNTI is used for scheduling transmission of a terminal in which the DCI has received the DCI through CRC scrambling. Whether it is for the purpose or whether it is information for scheduling of another terminal may be distinguished. In this case, the coordinating terminal may identify DCI information and instruct the corresponding scheduling information (resource allocation related information) to another terminal. Method 2 is a method of indicating information (resource allocation related information) for scheduling of another terminal by introducing a new DCI format. In Method 1 and Method 2, a method of CRC scrambling with RNTI may be considered so that only a specific UE (UE specific) or designated UEs (Cell specific or group specific) can receive DCI transmitted by the base station. Alternatively, in the case of Method 2, a method in which CRC scrambling is not performed with RNTI may be considered so that a plurality of unspecified terminals can receive DCI transmitted by the base station. In addition, the following method may be considered as a method of configuring DCI contents when a sidelink transmission of another terminal is scheduled from a terminal that has received the DCI.

* Method 1: Configure DCI content only with information for scheduling sidelink transmission of another terminal from the terminal that has received the DCI

* Method 2: Configure DCI contents with information for scheduling sidelink transmission of the terminal that has received DCI as well as information for scheduling sidelink transmission of other terminals from the terminal that has received DCI

When the method 2 is considered, the DCI size may be increased by including both the information included in the DCI format 3_0 and the information presented in this embodiment.

When resource allocation related information for supporting inter-UE coordination of sidelink through the second embodiment is instructed from the base station to the coordinating terminal, the coordinating terminal instructs this information to another terminal This can be considered. At this time, the base station corresponds to one or more of one set of information (resource pool index 2, time gap, time gap2, lowest index 2 of the sub-channel for initial transmission, frequency and time resource assignment, resource reservation period information presented above) can be), the coordinating terminal may instruct it to another terminal as it is. However, when the base station indicates one or more sets of information, a method in which the coordinating terminal selects and indicates one or more sets of information to another terminal may be considered. For a method by which the coordinating terminal indicates information for supporting inter-terminal cooperation to other terminals, refer to the third embodiment below.

The third embodiment proposes a method in which a coordinator UE indicates information for supporting inter-UE coordination of a sidelink to another UE. Note that, in the present embodiment, the corresponding information is not limited to the information presented below. First, the following information may be considered as resource selection related information indicated by a coordinating terminal to another terminal. It is also noted that one or more of the information below may be considered.

* Resource pool index 2

비트 정보가 포함될 수 있다. 여기서 I 는 상위 레이어로 설정된 전송 자원 풀의 수를 나타내며, 하나의 자원 풀만 설정될 경우에는 0 bit로 설정될 수 있다.: The above information is for the coordinating terminal to indicate resource pool information to be used by other terminals performing inter-terminal cooperation. If the cooperation between terminals operates according to the method 1 of the first embodiment, the coordinating terminal may indicate the resource pool index 2 according to the second embodiment to another terminal. If the cooperation between terminals operates according to the method 2 of the first embodiment, a method in which the coordinating terminal directly selects a resource pool index and instructs other terminals may be considered when a plurality of resource pools are set. If that method is used and multiple resource pools are established, for example,

Bit information may be included. Here, I represents the number of transmission resource pools configured as a higher layer, and may be set to 0 bit when only one resource pool is configured.

* Time gap2

: The information is to indicate a time interval during which the other terminal receives the SCI and performs sidelink transmission when the coordinating terminal indicates resource allocation related information to another terminal. If the cooperation between terminals operates according to the method 1 of the first embodiment, the coordination terminal may indicate the time gap2 according to the second embodiment to another terminal. If the cooperation between terminals operates according to the method 2 of Embodiment 1, a method in which the coordinating terminal directly selects the time gap2 and instructs the other terminal may be considered. When the corresponding method is used, the corresponding indication may be composed of X-bit information, and the corresponding value may be set to a higher layer.

이후의 첫 사이드링크 슬롯에서 사이드링크 전송을 수행할 수 있다. 여기서

는 조정 단말로부터 SCI를 송수신하는 슬롯의 시작 시점을 나타낼 수 있다.

는 상기 Time gap2에 해당되는 값을 나타낼 수 있다. 그리고

는 사이드링크 슬롯의 duration을 나타낼 수 있다.The terminal receiving the information from the coordinating terminal

Sidelink transmission may be performed in a subsequent first sidelink slot. here

may indicate a start time of a slot for transmitting and receiving SCI from the coordinating terminal.

may represent a value corresponding to the time gap2. and

may indicate the duration of the sidelink slot.

* Lowest index 2 of the sub-channel for initial transmission

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 서브채널의 수를 나타낸다.: The above information is for the coordinating terminal to indicate location information of a subchannel used for transmission of other terminals performing inter-terminal cooperation. If the cooperation between terminals operates according to the method 1 of the first embodiment, the coordinating terminal may indicate the lowest index 2 of the sub-channel for initial transmission according to the second embodiment to another terminal. If the cooperation between terminals operates according to the method 2 of the first embodiment, a method in which the coordinating terminal directly selects the Lowest index 2 of the sub-channel for initial transmission and instructs the other terminal may be considered. If that method is used, for example,

Bit information may be included. here

indicates the number of subchannels configured in the resource pool.

* Frequency and time resource assignment

비트 정보가 포함될 수 있다. 상위 레이어(자원 풀)로 설정된 최대 전송 예약 자원의 수가 3인 경우에,

비트 정보가 포함될 수 있다. 여기서

는 자원풀에 설정된 서브채널의 수를 나타낸다.: The coordinating terminal may indicate frequency and time resource allocation information to another terminal. If the cooperation between terminals operates according to the method 1 of the first embodiment, the coordinating terminal may instruct the other terminal to perform frequency and time resource assignment according to the second embodiment. If the cooperation between terminals operates according to method 2 of the first embodiment, a method in which the coordinating terminal directly selects frequency and time resource assignment and instructs other terminals may be considered. When the method is used, for example, when the number of maximum transmission reservation resources set to the upper layer (resource pool) as information for indicating the frequency resource allocation position is 2,

Bit information may be included. When the number of maximum transmission reservation resources set to the upper layer (resource pool) is 3,

Bit information may be included. here

indicates the number of subchannels configured in the resource pool.

* Resource reservation interval

비트 정보가 포함될 수 있다. 여기서

는 상위 레이어(자원 풀)에 설정된 주기 값의 수를 나타낼 수 있다. 만약 상위 레이어(자원 풀)에 해당 값이 설정되지 않은 경우에는 주기적인 자원 예약을 하지 않는 것으로 판단하며 0 bit로 설정될 수 있다.: The coordinating terminal may indicate periodic resource reservation of another terminal. If the cooperation between terminals operates according to method 1 of the first embodiment, the coordinating terminal may indicate the resource reservation interval according to the second embodiment to another terminal. If the cooperation between terminals operates according to method 2 of the first embodiment, a method in which the coordinating terminal directly selects a resource reservation interval and instructs another terminal may be considered. If that method is used, for example,

Bit information may be included. here

may indicate the number of period values set in the upper layer (resource pool). If the corresponding value is not set in the upper layer (resource pool), it is determined that periodic resource reservation is not performed and may be set to 0 bit.

In addition to the above information, information useful for cooperation between terminals may be indicated from the base station to the coordinating terminal. Specifically, the following coordinating terminal information may be indicated to another terminal.

* CBR (Channel Busy Ratio)

* Speed

* Location

When two terminals communicate in the sidelink, the CBR measured by each terminal may be different. Currently, CBR information measured by each terminal is not shared, but congestion control can be performed more effectively when the corresponding information is shared. In addition, since the relative speed can be measured when speed information is shared between terminals in the sidelink, it can be effective in determining the transmission parameters (MCS, DMRS pattern, etc.) of the terminal. In addition, when the location information of the terminal is shared, it can be effectively used to perform sidelink beamforming in the future. Accordingly, the information may be very useful information for performing cooperation between terminals. In addition, the following information included in the SCI format 1-A may be additionally considered. For details on the information below, refer to SCI format 1-A.

* DMRS pattern

* 2nd-stage SCI format

* Beta_offset indicator

* Number of DMRS port

* Modulation and coding scheme

* Additional MCS table indicators

The terminal-to-terminal signaling method in the first embodiment may be applied as a method of indicating information presented for cooperation between terminals in the third embodiment. If the UE receives an indication of resource allocation related information from another UE through SCI as in Method 3 of the first embodiment, the following method may be considered. The present disclosure is not limited only to the following method.

* Method 1: New SCI format (ex, SCI format 1-X)

* Method 2: Reuse SCI format 1-A

* Method 3: by 2nd stage SCI (ex, SCI format 2-X)

The method 1 introduces a new 1st stage SCI format (ex, SCI format 1-X) to indicate whether scheduling information (resource allocation related information) used for transmission of the terminal is indicated or the terminal is used to indicate scheduling information of another terminal. A way to distinguish between cognition. When a 1st stage SCI format for a new UE to provide resource allocation related information to another UE is defined, this may be a UE-specific 1st stage SCI format for providing resource allocation information to one specific UE. In addition, it may be a group common 1st stage SCI format for providing resource allocation information to a plurality of terminals in consideration of a groupcast scenario such as platooning. The method 2 uses the existing SCI format (1st stage SCI) as it is and utilizes a reserved bit to determine whether the scheduling information (resource allocation related information) of the corresponding format is scheduling information used for transmission of the terminal, or the terminal determines the scheduling information of another terminal. It is a way to distinguish whether it is intended to indicate

When the method of transmitting the 1st stage SCI through the PSCCH like Method 1 and Method 2 is used, an additional transmission method may be considered. In the current NR sidelink, transmission of the PSCCH and the PSSCH is always performed together. However, only PSCCH transmission is supported (which may be referred to as a stand-alone PSCCH) or a method in which PSCCH and PSSCH transmission with the same limited frequency allocation size are supported may be considered. Specifically, this method is not for the purpose of PSSCH transmission, but for pre-occupying and reserving resources by transmitting the 1st stage SCI for scheduling resources. In this embodiment, since a method for the terminal to receive scheduling information from another terminal (or a method for the terminal to schedule another terminal, in other words, a method for the terminal to provide resource allocation information to another terminal), such a transmission method is effective Note that this can be a method.

In a method in which transmission of the same PSCCH and PSSCH is supported for the same limited frequency allocation size as described above, the limited frequency allocation size may be defined as an X subchannel. Here, X=1 may be the case. However, in the present disclosure, the limited frequency allocation size is not limited to a specific value. A method in which transmission of the same PSCCH and PSSCH of the same limited frequency allocation size is supported, and the main purpose is to occupy and reserve resources in advance by transmitting the 1st stage SCI for scheduling resources, but PSSCH transmission is also allowed. As such, a method in which only PSCCH transmission is supported or transmission of PSCCH and PSSCH of the same limited frequency allocation size is supported can be used when the UE provides resource allocation information to another UE, as well as when the UE provides its own resource allocation information Note that it can also be used when transmitting In other words, the UE may occupy and reserve the transmission resource in advance while indicating its resource allocation information through the 1st stage SCI.

In addition, when it is considered in a method for the UE to provide resource allocation information to other UEs as 1st stage SCI (PSCCH), the UE receiving the 1st stage SCI (PSCCH) includes scheduling information of the UE that transmitted it. can be distinguished. And when the corresponding 1st stage SCI (PSCCH) is not scheduling information of the terminal that transmitted it, the terminal receiving it may perform one of the following two operations. The first operation is a method of decoding the 1st stage SCI (PSCCH) and reflecting it in the sensing and resource selection operation. In contrast, the second operation is a method of decoding the 1st stage SCI (PSCCH) and not reflecting it in the sensing and resource selection operation. The first operation may be a method assuming that the terminal uses the resource allocation information when the terminal transmits the resource allocation information to another terminal, and reflects the resource to other terminals by reflecting the resource allocation information in sensing and resource selection operations You can avoid using this. In the case of the second operation, when the terminal transmits resource allocation information to another terminal, the corresponding terminal may not use the resource allocation information.

In addition, the method 3 is a method of indicating scheduling information (resource allocation related information) of another terminal through the 2nd SCI. For this, a new 2nd SCI format (eg, SCI format 2-X) may be defined. In this case, the 2nd-stage SCI format indicator included in the 1st SCI may indicate that the corresponding 2nd SCI format is used. In addition, in the case of method 1, the following method may be considered as a method of configuring SCI contents.

* Method 1: Configure SCI content only with information for scheduling sidelink transmission of other terminals

* Method 2: SCI contents are configured with information for scheduling sidelink transmission of other terminals as well as scheduling information of a terminal that transmits SCI

When the method 2 is considered, the SCI size may be increased by including both the information included in the SCI format 1-A and the information presented in this embodiment.

In addition, in the present disclosure, when the UE receives an indication of resource allocation related information from another UE through SCI as in Method 3 of the first embodiment in the present disclosure, the following UE operation may be considered.

* Terminal operation 1: The terminal may perform data reception from another terminal and may continuously perform SCI monitoring.

* Terminal operation 2: The terminal may perform only periodic SCI monitoring without performing data reception from other terminals.

In the case of the terminal operation 1, the case of the terminal in which power consumption is not a problem may be considered. The UE may continuously perform SCI monitoring and receive an indication of resource allocation related information from another UE through the SCI. In addition, sensing may be performed through SCI decoding and channel measurement. In addition, data may be received from another terminal through PSSCH reception. In the case of the terminal operation 2, it may be considered in the case of a terminal that needs to reduce power consumption. When the terminal operation 2 is considered, the SCI monitoring period is shared between terminals, and only in the period, the terminal performs SCI monitoring and can receive resource allocation related information from other terminals. The SCI monitoring period may be (pre-)configured in the resource pool, or may be configured through PC5-RRC. In UE operation 2, since the UE may not continuously perform SCI monitoring or receive PSSCH, it is a method capable of greatly reducing power consumption of the UE.

In the fourth embodiment, a method for the UE to indicate corresponding information in the process of performing Inter-UE coordination will be described with reference to the drawings.

8 is a diagram illustrating an overall terminal operation for performing cooperation between terminals according to various embodiments of the present disclosure. In FIG. 8 , the focus is on indicating resource allocation related information as information for cooperation between terminals, but information for cooperation between terminals is not limited to resource allocation related information. Note that in the present invention, the meanings of resource selection information and resource allocation information may be used interchangeably.

First, referring to FIG. 8(a), when the coordinating terminal is within the base station coverage, a method of receiving resource allocation information for another terminal from the base station and instructing it to the other terminal is illustrated. The coordinating terminal may receive resource allocation related information from the base station in step 801 . For a detailed signaling method for this, refer to the signaling method between base station terminals of the first embodiment. Note that broadcast, unicast, or groupcast between base station terminals may be applied according to the applied signaling method. Next, the coordinating terminal may determine resource allocation related information to be indicated to another terminal in step 802 . As described in the second embodiment, when a method of indicating information indicated by the base station to another terminal as it is is considered, step 802 may be omitted. Next, the coordinating terminal may transmit resource allocation related information to another terminal in step 803 . For a detailed signaling method for this, refer to the terminal-to-terminal signaling method of the first embodiment. Note that sidelink broadcast, unicast, or groupcast may be applied according to an applied signaling method.

Referring to FIG. 8( b ), a method is shown in which the coordinating terminal selects a transmission resource of another terminal through direct sensing and instructs the other terminal with resource allocation information for this. The coordination terminal may perform sensing for resource selection in step 811 . At this time, sensing may be defined as a process of performing SCI decoding and RSRP measurement. Next, the coordinating terminal may determine resource allocation related information to be indicated to another terminal by using the sensing result in step 811 in step 812 . When the terminal performs the sensing of step 811 and the resource selection process of step 812, the resource selection of another terminal and the resource selection for the transmission of the coordinating terminal may be simultaneously performed or performed separately at different times. Pay attention. Next, the coordinating terminal may transmit resource allocation related information to another terminal in step 813 . For a detailed signaling method for this, refer to the terminal-to-terminal signaling method of the first embodiment. Note that sidelink broadcast, unicast, or groupcast may be applied according to an applied signaling method. In addition, it is noted that the resource allocation information of another terminal and the resource allocation information of the coordinating terminal may be simultaneously indicated or may be indicated separately at different times.

Referring to FIG. 8( c ), a method is illustrated in which another terminal receives resource allocation related information transmitted by the coordinating terminal and performs cooperation between terminals through this. The terminal may receive resource allocation related information from the coordinating terminal in step 831 . Next, the terminal may determine whether to apply the resource allocation related information received in step 831 in step 832 . When a method of applying the information indicated by the coordinating terminal as it is is considered, step 832 may be omitted. If the terminal is a terminal that needs to minimize power consumption, the resource allocation information indicated by the coordinating terminal may be used as it is without performing a sensing and resource selection procedure. Alternatively, it may be determined which resource should be finally selected through the resource allocation related information indicated by the coordinating terminal in step 832 . For a terminal that needs to minimize power consumption, refer to the third embodiment for a method of indicating the corresponding information of the coordinating terminal. Contrary to this, in the case of a terminal that does not need to minimize power consumption, the sensing and resource selection procedure may be separately performed, and it may be determined whether or not to apply the resource allocation related information received from the coordinating terminal in step 832 . Finally, the terminal may determine the transmission resource according to the method determined in steps 833 to 832.

In order to carry out the above embodiments of the present disclosure, a transmitter, a receiver, and a processor of a terminal and a base station are illustrated in FIGS. 9 and 10 , respectively. In the above embodiments, a method for the terminal to perform sensing and resource selection in the sidelink is shown, and to perform this, the receiving unit, the processing unit, and the transmitting unit of the base station and the terminal must operate according to the embodiment, respectively.

Specifically, FIG. 9 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure. As shown in FIG. 9 , the terminal may include a terminal receiving unit 900 , a terminal transmitting unit 904 , and a terminal processing unit 902 . The terminal receiving unit 900 and the terminal may collectively refer to the transmitting unit 904 as a transceiver in an embodiment of the present disclosure. The transceiver may transmit/receive a signal to/from the base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through a wireless channel and output it to the terminal processing unit 902 , and transmit the signal output from the terminal processing unit 902 through a wireless channel. The terminal processing unit 902 may control a series of processes so that the terminal may operate according to various embodiments of the present disclosure.

10 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure. As shown in FIG. 10 , the base station may include a base station receiving unit 1001 , a base station transmitting unit 1005 , and a base station processing unit 1003 . The base station receiving unit 1001 and the base station transmitting unit 1005 may be collectively referred to as a transceiver in the embodiment of the present disclosure. The transceiver may transmit/receive a signal to/from the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through a wireless channel and output it to the base station processing unit 1003 , and transmit the signal output from the base station processing unit 1003 through the wireless channel. The base station processing unit 1003 may control a series of processes so that the base station can operate according to various embodiments of the present disclosure.

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications can be implemented based on the technical idea of the present invention. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, in all embodiments of the present invention, parts may be combined with each other to operate a base station and a terminal.

Claims (1)

A control signal processing method in a wireless communication system, comprising:
Receiving a first control signal transmitted from the base station;
processing the received first control signal; and
and transmitting a second control signal generated based on the processing to the base station.

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