KR20220133733A - Method and apparatus for granting sidelink resource for sidelink relay discovery message in wireless communication system - Google Patents

Abstract

A method for a terminal to transmit a sidelink relay discovery message in a wireless communication system according to an embodiment of the present disclosure may include the steps of: determining a transmission condition for the sidelink relay discovery message; in response to the satisfaction of the transmission condition, checking settings of a base station related to the allocation of transmission resources for transmission of the sidelink relay discovery message; based on the setting of the base station, receiving the transmission resource from the base station or selecting a transmission resource from a preset resource pool; and transmitting a sidelink relay discovery message by using an allocated transmission resource or the selected transmission resource. The present disclosure relates to a communication technique and system that converges, with IoT technology, a 5^th generation (5G) or pre-5G communication system for supporting a higher data rate beyond a 4^th generation (4G) communication system, such as long term evolution (LTE). The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. According to various embodiments of the present disclosure, a method and apparatus for supporting sidelink relay discovery in a wireless communication system may be provided. The service coverage can be extended.<quillbot-extension-portal></quillbot-extension-portal>

Description

Method and apparatus for supporting transmission resource allocation of sidelink relay discovery message in wireless communication system

This disclosure relates to a wireless communication system. More specifically, it relates to a method and an apparatus for discovering a relay terminal capable of supporting direct communication when a terminal and a terminal perform direct communication based on a sidelink in a wireless communication system.

Efforts are being made to develop an improved ^5th generation ( ^5G ) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G (4th generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network beyond (beyond 4G Network) communication system or a long term evolution (LTE) system after the (post LTE) system.

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 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, full dimensional MIMO, FD-MIMO ), 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 reception interference cancellation (interference cancellation) Technology development is underway.

In addition, in the 5G system, hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC), which are advanced coding modulation (ACM) methods, and filter bank multi carrier (FBMC), which are advanced access technologies, are ), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are being developed.

The 5G system is considering support for various services compared to the existing 4G system. For example, the most representative services are enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication, mMTC), and an evolved multimedia broadcast/multicast service (eMBMS). In addition, a system providing a URLLC service may be referred to as a URLLC system, and a system providing an eMBB service may be referred to as an eMBB system. Also, the terms service and system may be used interchangeably.

Among them, the URLLC service is a service that is newly considered in the 5G system, unlike the existing 4G system, and has ultra-high reliability (eg, an error rate of about 10 ^-5 or less) and low latency (eg, less than about 10 -5) compared to other services. , delay time of less than about 0.5 msec) requirement to be satisfied. In order to satisfy these strict requirements, the URLLC service may need to apply a shorter transmission time interval (TTI) than the eMBB service, and various operating methods are being considered using this.

On the other hand, the Internet is evolving from a human-centered connection network where humans generate and consume information, to an Internet of things (IoT) network in which information is exchanged and processed between distributed components such as objects. Internet of everything (IoE) technology, in which big data processing technology through connection with cloud servers, etc., is combined with IoT technology, is also emerging. In order to implement the IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, and machine to machine communication (machine to machine) are required. , M2M), and MTC (machine type communication) are being studied.

In the IoT environment, an intelligent Internet technology (IT) 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 a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

In addition, direct communication between terminals using a 5G communication system, for example, sidelink communication, is being studied, and direct communication between terminals is, for example, vehicle-to-everything (V2X), a public safety network. ), it is expected to be able to provide various services to users.

In direct communication between terminals using sidelink communication, a method of using a sidelink relay capable of supporting service coverage extension, data transmission reliability increase, and terminal power consumption reduction is required. The present disclosure is to provide a method and apparatus for allocating resources for transmitting a relay discovery message used in a sidelink relay discovery procedure to support a terminal performing sidelink-based data transmission and reception in a wireless communication system. .

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be able

A method for a terminal to transmit a sidelink relay discovery message in a wireless communication system according to an embodiment of the present disclosure includes: determining a transmission condition for the sidelink relay discovery message; Checking the configuration of the base station related to the allocation of the transmission resource for transmission of the sidelink relay discovery message; based on the configuration of the base station, the transmission resource is allocated from the base station or the transmission resource from a preset resource pool and transmitting a sidelink relay discovery message using the allocated transmission resource or the selected transmission resource.

According to an embodiment of the present disclosure, there is provided a method in which a terminal is allocated a transmission resource for a sidelink relay discovery message in a wireless communication system, the method comprising: determining, by the terminal, a sidelink discovery message; determining a transmission resource set for a sidelink discovery message transmission purpose; selecting a transmission resource configured to transmit a sidelink discovery message; receiving an allocation of a transmission resource set for the purpose of transmitting a sidelink discovery message; The method may include at least one of the step of transmitting the sidelink discovery message by the terminal using the allocated transmission resource.

According to an embodiment of the present disclosure, a service may be effectively provided to a user in a wireless communication system, and service coverage may be extended.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1A is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
1B is a diagram illustrating a wireless communication system according to another embodiment of the present disclosure.
2 is a block diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
3 is a block diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
4 is a block diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
5 is a block diagram illustrating a structure of a time-frequency resource of a wireless communication system according to an embodiment of the present disclosure.
6A is a diagram illustrating a sidelink relay discovery procedure according to an embodiment of the present disclosure.
6B is a diagram illustrating a sidelink relay discovery procedure according to another embodiment of the present disclosure.
7 is a diagram illustrating a protocol structure of a sidelink relay discovery message according to an embodiment of the present disclosure.
8A is a flowchart illustrating a resource allocation processing operation for transmitting a sidelink relay discovery message according to an embodiment of the present disclosure.
8B is a flowchart illustrating a resource allocation processing operation for transmitting a sidelink relay discovery message according to another embodiment of the present disclosure.
9 is a flowchart illustrating a resource allocation processing operation for transmitting a sidelink message according to an embodiment of the present disclosure.
10 is a flowchart illustrating an operation of setting a sidelink relay discovery message transmission and reception setting according to an embodiment of the present disclosure.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. At this time, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present disclosure may be omitted.

In describing embodiments in the present specification, descriptions of technical content that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure may 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 may be exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size, and each component is not limited to the illustrated bar. In each figure, the same or corresponding elements are assigned the same reference numerals.

Advantages and features of the present disclosure, and methods 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 and may be implemented in various different forms. The present embodiments may be provided so that the present disclosure is complete, and to completely inform those of ordinary skill in the art to which the present disclosure pertains the scope of the disclosure. The present disclosure may be defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In various embodiments, it will be appreciated that each block of the flowchart figures and combinations of the flowchart figures may be executed 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, and the instructions executed by the processor of the computer or programmable data processing equipment may perform the functions described in the flowchart block(s). You can create a means to do it. It may also be possible for these computer program instructions to be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner. Instructions stored in a computer usable or computer readable memory may 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 embodied on a computer or other programmable data processing equipment. A series of operational steps performed on a computer or programmable data processing equipment to create a computer-executed process, the instructions for performing the computer or programmable data processing equipment include steps for performing the functions described in the flowchart block(s). may provide.

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 the blocks to occur out of order. For example, it is possible that two blocks shown in succession are actually performed substantially simultaneously, or that the blocks are sometimes performed in the reverse order according to the 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. '~unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' denotes 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.

In describing the embodiments of the present disclosure in detail, the radio access network New RAN (NR) and the core network packet core (5G system, 5G core network, or NG on the 5G mobile communication standard specified by 3GPP, a mobile communication standard standardization organization) Core (next generation core) can be the main target. The main subject matter of the present disclosure is applicable to other communication systems having a similar technical background with slight modifications within a range that does not significantly depart from the scope of the present disclosure, which can be achieved by those of skill in the technical field of the present disclosure. It will be possible by judgment.

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 from a 5G network, may be defined. The NWDAF can collect/store/analyze information from the 5G network and provide the results to an unspecified network function (NF), and the analysis results can be used independently by each NF.

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

Hereinafter, the present disclosure provides resource allocation for transmitting a sidelink relay discovery message in a case in which data transmission/reception is performed directly between a terminal and a terminal or data transmission/reception between a terminal and a base station using a sidelink relay terminal in a wireless communication system It relates to a method and apparatus for processing

Specifically, the present disclosure provides a method for a sidelink relay terminal (relay UE) or a sidelink remote terminal (remote UE) to process allocation information of a sidelink transmission resource for transmitting a sidelink relay discovery message. The above method may be applied when the relay terminal or the remote terminal receives an assignment from the base station, or when the relay terminal or the remote terminal directly selects. The operation of receiving a sidelink transmission resource for transmitting a sidelink relay discovery message from the base station includes an operation of a relay terminal or a remote terminal transmitting a sidelink transmission resource allocation request to the base station and an operation of receiving a sidelink transmission resource allocation from the base station may include The operation of receiving a sidelink transmission resource for transmitting a sidelink relay discovery message from a base station is an operation in which a relay terminal or a remote terminal is allocated a periodic transmission resource or a semi-persistence transmission resource from the base station. may include

Data or signaling transmitted using the sidelink separately from the sidelink relay discovery message according to an embodiment of the present disclosure is PC5-S signaling transmitted in a sidelink common control channel (SCCH) introduced to support the NR-V2X function ( Yes, Direct Link Establishment Request, Direct Link Establishment Accept, Direct Security Mode Command, Direct Security Mode Complete, Direct Link Release Request, Direct Link Release Accept), PC5-RRC Message (e.g. RRC Reconfiguration Sidelink, RRC Reconfiguration Complete Sidelink, UE Capability Inquiry Sidelinke, UE Capability Information Sidelink), and may include at least one of PC5 user packet (user traffic information). The sidelink relay discovery message may be transmitted through a separate sidelink signaling bearer, a separate logical channel, or a separate logical channel group, unlike other sidelink data or other sidelink signaling. The sidelink relay discovery message may be transmitted through a resource selected from a separate sidelink resource pool, unlike other sidelink data or other sidelink signaling. The sidelink relay discovery message may be indicated in separate sidelink control indication information (SCI) differently from other sidelink data or other sidelink signaling. According to embodiments of the present disclosure, by allowing the terminal to search for a sidelink relay, service coverage can be extended, data transmission/reception reliability can be increased, and battery usage of the terminal can be reduced.

Also, specifically, according to an embodiment of the present disclosure, a method of processing configuration information for a terminal to transmit or receive a sidelink relay discovery message in a wireless communication system includes a gap in which the terminal transmits a sidelink relay discovery message. ) obtaining setting information; obtaining, by the terminal, interval configuration information for receiving a sidelink relay discovery message; Obtaining configuration information for a sidelink configured grant for the terminal to receive a transmission resource for transmitting a sidelink relay discovery message in a periodic or semi-persistent manner; can

Terms that refer to signals, terms that refer to channels, terms that refer to control information, terms that refer to network entities, and terms that refer to components of devices used in the following description are for convenience of description. it is exemplified 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.

Hereinafter, the base station is a subject performing resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. However, this is only an example, and the base station and the terminal are not limited to these examples. In the present disclosure, eNB may be used interchangeably with gNB for convenience of description. That is, a base station described as an eNB may represent a gNB. In the present disclosure, the term terminal may refer to various wireless communication devices as well as mobile phones, NB-IoT devices, and sensors.

In the following description, a physical channel and a signal may be used interchangeably with data or a control signal. For example, a physical downlink shared channel (PDSCH) is a term referring to a physical channel through which data is transmitted, but the PDSCH may also be used to refer to data. That is, in the present disclosure, an expression 'transmitting a physical channel' may be interpreted equivalently to an expression 'transmitting data or a signal through a physical channel'.

Hereinafter, in the present disclosure, higher signaling refers to a signal transmission method in which a base station is transmitted to a terminal using a downlink data channel of a physical layer, or from a terminal to a base station using an uplink data channel of a physical layer. Upper signaling may be understood as radio resource control (RRC) signaling or media access control (MAC) control element (CE).

In addition, in the present disclosure, in order to determine whether a specific condition is satisfied (satisfied) or satisfied (fulfilled), an expression of more than or less than is used, but this is only a description for expressing an example. It's not about exclusion. Conditions described as 'more than' may be replaced with 'more than', conditions described as 'less than', and conditions described as 'more than and less than' may be replaced with 'more than and less than'.

In addition, although the present disclosure describes exemplary embodiments using terms used in some communication standards (eg, 3rd generation partnership project (3GPP)), this is only an example for description. Embodiments of the present disclosure may be easily modified and applied in other communication systems.

1A is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.

1A shows a base station 110, terminals 130 and 140, and a sidelink relay 120 capable of relaying data transmission/reception between the base station and the terminal as a part of nodes using a wireless channel in a wireless communication system. exemplify Here, the sidelink relay corresponds to a UE to network (U2N) relay. 1A shows only one base station, other base stations that are the same as or similar to the base station 110 may further exist.

The base station 110 is a network infrastructure that provides wireless access to the terminals 130 and 140 and the relay 120 . The base station 110 has coverage defined as a certain geographic area based on a distance capable of transmitting a signal. In addition to the base station (base station), the base station 110 includes an 'access point (AP)', an 'eNodeB (eNodeB)', a '5G node (5th generation node)', a 'next generation nodeB' , gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms having an equivalent technical meaning.

The relay 120 is a device used by a user or network infrastructure, and may communicate with the base station 110 through a wireless channel. A link from the base station 110 to the relay 120 may be referred to as a downlink (DL), and a link from the relay 120 to the base station 110 may be referred to as an uplink (UL). The base station 110 and the relay 120 may be connected through a Uu interface. Uplink (UL) means a radio link in which the relay 120 transmits data or control signals to the base station 110 , and downlink (DL) is the base station 110 sending data to the relay 120 . Or it means a radio link for transmitting a control signal.

The relay 120 may communicate with the first terminal 130 and the second terminal 140 through a wireless channel. In this case, the link between the relay 120 and the first terminal 130 and the link between the relay 120 and the second terminal 140 are referred to as a sidelink, and the sidelink may also be referred to as a PC5 interface.

Each of the terminals 130 and 140 is a device used by a user, and may communicate with the base station 110 through a wireless channel or may communicate with a network through the relay 120 and a wireless channel. . In the present disclosure, a case in which each of the first terminal 130 and the second terminal 140 performs communication through a wireless channel with the relay 120 may be considered. At least one of the first terminal 130 and the second terminal 140 may be operated without the user's involvement. That is, at least one of the first terminal 130 and the second terminal 140 is a device that performs machine type communication (MTC) and may not be carried by the user. Each of the first terminal 130 and the second terminal 140 is a terminal other than 'user equipment (UE)', 'mobile station', 'subscriber station', 'remote It may be referred to as 'remote terminal', 'wireless terminal', 'user device', or other terms having an equivalent technical meaning.

1B is a diagram illustrating a wireless communication system according to another embodiment of the present disclosure.

FIG. 1B shows wireless communication including terminals 150 and 170 and a sidelink relay 160 capable of relaying data transmission/reception between terminals as a part of nodes using a wireless channel in a wireless communication system. shows the system. Here, the sidelink relay 160 corresponds to a U2U (UE to UE) relay.

The relay 160 may communicate with the third terminal 150 and the fourth terminal 170 through a wireless channel. In this case, the link between the relay 160 and the third terminal 150 and the link between the relay 160 and the fourth terminal 170 are referred to as a sidelink, and the sidelink may also be referred to as a PC5 interface.

Each of the third terminal 150 and the fourth terminal 170 is a device used by a user, and can communicate directly through a wireless channel or communicate with a counterpart terminal through a relay 160 and a wireless channel. can do. In this case, the link between the third terminal 150 and the fourth terminal 170, the link between the third terminal 150 and the relay 160, and the link between the fourth terminal 170 and the relay 160 are referred to as sidelinks. and the sidelink may be referred to as a PC5 interface.

At least one of the third terminal 150 and the fourth terminal 170 may be operated without user's involvement. That is, at least one of the third terminal 150 and the fourth terminal 170 is a device that performs machine type communication (MTC) and may not be carried by the user. Each of the third terminal 150 and the fourth terminal 170 is a terminal other than 'user equipment (UE)', 'mobile station', 'subscriber station', 'remote It may be referred to as a 'remote terminal', 'wireless terminal', or 'user device' or other terms having an equivalent technical meaning.

In the following description, uplink or downlink and Uu interface, sidelink and PC5 may be used interchangeably.

The base station 110, the relays 120, 160, and the terminals 130, 140, 150, and 170 shown in FIGS. 1A to 1B are in millimeter wave (mmWave) bands (eg, 28 GHz, 30 GHz, 38 GHz, 60 GHz). ) can transmit and receive wireless signals. In this case, in order to improve the channel gain, the base station 110 , the relays 120 and 160 , and the terminals 130 , 140 , 150 and 170 may perform beamforming. Here, the beamforming may include transmit beamforming and receive beamforming. That is, the base station 110 , the relays 120 , 160 , and the terminals 130 , 140 , 150 , and 170 may impart directivity to a transmission signal or a reception signal. To this end, the base station 110, the relays 120, 160, and the terminals 130, 140, 150, and 170 serve beams through a beam search or beam management procedure. (112, 113, 121, 131, 141, 151, 161, 171) can be selected. After the serving beams (112, 113, 121, 131, 141, 151, 161, 171) are selected, communication is performed with the resource and QCL from which the serving beams (112, 113, 121, 131, 141, 151, 161, 171) are transmitted. (quasi co-located) can be performed through resources in a relationship.

If the large-scale characteristics of the channel carrying the symbol on the first antenna port can be inferred from the channel carrying the symbol on the second antenna port, then the first antenna port and the second antenna port are said to be in a QCL relationship. can be evaluated. For example, the wide range of characteristics may include delay spread, Doppler spread, Doppler shift, average gain, average delay, or spatial receiver parameters. parameter) may be included.

The first terminal 130 , the second terminal 140 , the third terminal 150 , and the fourth terminal 170 illustrated in FIGS. 1A and 1B may support vehicle communication. In the case of vehicle communication, standardization work for V2X (vehicle to everything) technology was completed in 3GPP Release 14 and Release 15 based on the device-to-device (D2D) structure in the LTE system, and based on 5G NR Standardization work for V2X technology was completed in 3GPP Release 16. In NR V2X, unicast communication, groupcast (or multicast) communication, and broadcast communication between the UE and the UE may be supported. In addition, NR V2X is different from LTE V2X, which aims to transmit and receive basic safety information necessary for vehicle road driving, group driving, advanced driving, extended sensor, remote driving, etc. We aim to provide more advanced services together. V2X service can be divided into basic safety service and advanced service. Basic safety services include vehicle notification (cooperative awareness messages) or basic safety message (BSM) service, left turn notification service, front-vehicle collision warning service, emergency vehicle approach notification service, forward obstacle warning service, and intersection signal information. It may include detailed services such as services. In addition, in the basic safety service, V2X information may be transmitted/received using a broadcast, unicast, or groupcast transmission method. In an advanced service, a quality of service (QoS) requirement may be strengthened than a basic safety service. In advanced services, a method that can transmit and receive V2X information using unicast and groupcast transmission methods other than broadcast to transmit and receive V2X information within a specific vehicle group or V2X information between two vehicles may be required. have. The advanced service may include detailed services such as platooning service, autonomous driving service, remote driving service, and extended sensor-based V2X service. In addition, NR V2X can provide a public safety service by supporting a direct communication service between a terminal and a terminal in an area where there is no network infrastructure.

Hereinafter, a sidelink (SL) refers to a transmission/reception path for a signal between a terminal and a terminal or a transmission/reception path for a signal between a terminal and a relay, which may be used interchangeably with the PC5 interface. Hereinafter, a base station is a subject that allocates resources for a terminal and a relay, and may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication. That is, the base station may mean an NR base station (eg, gNB), an LTE base station (eg, eNB), or a road site unit (RSU). A terminal is a vehicle supporting vehicle-to-vehicular (V2V) communication as well as general user equipment and mobile station, and communication between vehicles and pedestrians (vehicular-to-pedestrian, V2P). ) supporting vehicle or pedestrian handset (e.g. smartphone), vehicle-to-network (V2N) communication (vehicular-to-infrastructure) , V2I) may include an RSU equipped with a vehicle and terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function.

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 (eg: smartphone), a vehicle supporting vehicle-to-network communication (vehicular-to-network, V2N), or a vehicle supporting vehicle-to-infrastructure communication (vehicular-to-infrastructure, V2I). . The terminal may mean a user device that supports communication between devices of the public safety net.

In addition, in the present disclosure, a terminal may mean 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 a base station function and a part of a terminal function.

In the present disclosure, the relay may mean a user device that supports communication between devices of a vehicle or public safety net supporting V2X communication. Also, in the present disclosure, a relay may refer to a device equipped with a terminal function, a device equipped with a base station function, or a device equipped with a part of a terminal function and a part of a base station function.

2 is a block diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.

The configuration shown in FIG. 2 may be understood as a configuration of the base station 110 . Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.

Referring to FIG. 2 , the base station 110 may include a wireless communication unit 210 , a backhaul communication unit 220 , a storage unit 230 , and a control unit 240 . However, the components of the base station 110 are not limited to the above-described example. For example, the base station may include more or fewer components than the above-described components. In addition, the wireless communication unit 210 , the backhaul communication unit 220 , the storage unit 230 , and the control unit 240 may be implemented in the form of a single chip. Also, the controller 240 may include one or more processors.

The wireless communication unit 210 may perform functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 may perform a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 may generate complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the wireless communication unit 210 may restore the received bit stream by demodulating and decoding the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits it through the antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. Also, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. can be composed of The digital unit may be implemented by at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used in the meaning of including processing as described above by the wireless communication unit 210 .

The backhaul communication unit 220 may provide an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station 110 to another node, for example, another access node, another base station, an upper node, a core network, etc. into a physical signal, and is received from another node. A physical signal can be converted into a bit string.

The storage unit 230 may store data such as a basic program, an application program, and setting information for the operation of the base station 110 . The storage unit 230 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 230 may provide stored data according to the request of the control unit 240 .

The controller 240 may control overall operations of the base station 110 . For example, the control unit 240 may transmit and receive a signal through the wireless communication unit 210 or through the backhaul communication unit 220 . In addition, the control unit 240 writes and reads data in the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by the communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the controller 240 may include at least one processor. According to embodiments, the controller 240 may control the base station 110 to perform operations according to embodiments to be described later.

3 is a block diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.

The configuration shown in FIG. 3 may be understood as a configuration of the terminal 120 . Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.

Referring to FIG. 3 , the terminal 120 may include a communication unit 310 , a storage unit 320 , and a control unit 330 . However, the components of the terminal 120 are not limited to the above-described example. For example, the terminal 120 may include more or fewer components than the aforementioned components. In addition, the communication unit 310 , the storage unit 320 , and the control unit 330 may be implemented in the form of a single chip. Also, the controller 330 may include one or more processors.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 may perform a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating the transmitted bit stream. Also, when receiving data, the communication unit 310 may restore a received bit stream by demodulating and decoding the baseband signal. Also, the communication unit 310 may up-convert the baseband signal into an RF band signal, transmit it through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array including a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented as one package. Also, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.

The communication unit 310 may transmit and receive signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel may be used to mean that the above-described processing is performed by the communication unit 310 .

The storage 320 may store data such as a basic program, an application program, and setting information for the operation of the terminal 120 . The storage unit 320 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 320 provides the stored data according to the request of the control unit 330 .

The controller 330 controls overall operations of the terminal 120 . For example, the control unit 330 may transmit and receive signals through the communication unit 310 . In addition, the control unit 330 writes and reads data in the storage unit 320 . And, the control unit 330 may perform the functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to embodiments, the controller 330 may control the terminal 120 to perform operations according to embodiments to be described later.

4 is a block diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.

4 shows an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 shows components for performing beamforming as a part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 .

Referring to FIG. 4 , the wireless communication unit 210 or the communication unit 310 includes an encoding and modulating unit 402 , a digital beamforming unit 404 , a plurality of transmission paths 406-1 to 406-N, and analog It may include a beamforming unit 408 .

The encoder and modulator 402 may perform channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoder and modulator 402 generates modulation symbols by performing constellation mapping.

The digital beamformer 404 may perform beamforming on a digital signal (eg, modulation symbols). To this end, the digital beamformer 404 may multiply the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of a signal, and may be referred to as a 'precoding matrix', a 'precoder', or the like. The digital beamformer 404 may output digital beamformed modulation symbols to the plurality of transmission paths 406 - 1 to 406 -N. In this case, according to a multiple input multiple output (MIMO) transmission technique, modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 to 406-N.

The plurality of transmission paths 406 - 1 to 406 -N may convert digital beamformed digital signals into analog signals. To this end, each of the plurality of transmission paths 406 - 1 to 406 -N may include an inverse fast fourier transform (IFFT) calculator, a cyclic prefix (CP) inserter, a DAC, and an up converter. The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) scheme, and may be excluded when another physical layer scheme (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406 - 1 to 406 -N may provide an independent signal processing process for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406 - 1 to 406 -N may be used in common.

The analog beamformer 408 may perform beamforming on an analog signal. To this end, the digital beamformer 404 may multiply the analog signals by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of the signal. Specifically, the analog beamformer 440 may be variously configured according to a connection structure between the plurality of transmission paths 406 - 1 to 406 -N and antennas. For example, each of the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, the plurality of transmission paths 406 - 1 to 406 -N may be adaptively connected to one antenna array or connected to two or more antenna arrays.

5 is a block diagram illustrating a structure of a time-frequency resource of a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 5 , in the radio resource domain, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol or a DFT-S-OFDM symbol (discrete fourier transform spread OFDM symbol), in which N _symb OFDM symbols or DFT-S-OFDM symbols 530 are one. may be included in the slot 505 of Unlike the slot, the length of the subframe in the NR system may be defined as 1.0 ms, and the length of the radio frame 500 may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may include a total of N _BW subcarriers 525 . Specific numerical values such as N _symb and N _BW may be variably applied depending on the system.

The basic unit of the time-frequency resource region is a resource element (RE) 510 , which may be represented by an OFDM symbol index or a DFT-S-OFDM symbol index and a subcarrier index. A resource block (RB) 515 may be defined as N _RB consecutive subcarriers 520 in the frequency domain. In general, the minimum transmission unit of data is an RB unit, and in general, N _symb = 14 and N _RB = 12 in an NR system.

The structure of the time-frequency resource as shown in FIG. 5 may be applied to the Uu interface. In addition, the time-frequency resource structure shown in FIG. 5 may be similarly applied to the sidelink.

The sidelink relay may be authenticated to be used in at least one of a specific service, a specific terminal, a specific sidelink flow, a specific sidelink bearer, a specific unicast link, a specific source identifier, and a specific destination identifier. The sidelink relay may establish a direct connection with an authenticated terminal at the time of installation. In an embodiment, the sidelink relay may transmit a sidelink relay discovery message and perform a sidelink direct connection establishment procedure with an authenticated terminal. In another embodiment, the sidelink relay may receive a sidelink relay discovery message from an authenticated terminal, transmit a sidelink relay discovery message to the authenticated terminal, and perform a sidelink direct connection establishment procedure with the terminal. In various embodiments, the sidelink relay discovery message may be understood as a message transmitted to each other to initiate a sidelink relay discovery procedure between the side relay and the terminal, and includes a message for discovery or a message for a discovery request. You may. Configuration information necessary for the sidelink relay terminal and the sidelink remote terminal to transmit or receive the sidelink relay discovery message may be obtained from the base station or preset.

Next, a sidelink relay discovery procedure will be described with reference to FIGS. 6A to 6B . The sidelink relay discovery procedure of FIGS. 6A to 6B may be applied to a UE-to-network (UE2NW) relay discovery procedure or a UE-to-UE (UE2UE) relay discovery procedure.

6A is a diagram illustrating a sidelink relay discovery procedure according to an embodiment of the present disclosure.

Referring to FIG. 6A , UE1 600 shows a relay UE functioning as a sidelink relay, and UE2 630 performs data transmission/reception with a base station or other terminal through support of sidelink relay. It shows a remote terminal (remote UE) that does. The UE1 600 may acquire authentication information or service information required for the relay role. Authentication information or service information required for the relay role may be acquired through a core network or an operations, administration and management (OAM) method. The UE1 600 may transmit a sidelink relay discovery message, for example, a first message in step 601 . According to the embodiment of FIG. 6A , the sidelink relay discovery message (first message) transmitted by the UE1 600 may include, for example, a discovery message. In various embodiments, the first message may include information indicating the existence of a sidelink relay or information on a service message that can be relayed. The UE1 600 may acquire configuration information necessary for transmitting the sidelink relay discovery message. The configuration information required to transmit the sidelink relay discovery message is transmission resource configuration (eg, frequency, bandwidth part, resource pool), configuration necessary to select transmission resources (eg, scheduling resource of the base station or when UE1 directly selects a resource) parameter applied to), power control for sidelink relay discovery message transmission, transmission parameter, retransmission parameter, MCS (modulation and coding scheme) information, target service of sidelink relay discovery message, target group, target destination, target PQI ( It may include at least one of a PC5 5QI (5G QoS Identifier) list and a target QoS parameter set list. In an embodiment of the present disclosure, the sidelink relay discovery message may be configured to be transmitted periodically. In an embodiment of the present disclosure, the sidelink relay discovery message may be configured to be transmitted in one shot or according to a predetermined period when a condition set to the UE1 600 is satisfied. Of course, the relay discovery message may be transmitted aperiodically.

6B is a diagram illustrating a sidelink relay discovery procedure according to another embodiment of the present disclosure.

UE3 (650) shows a relay terminal (relay UE) functioning as a sidelink relay, UE4 (680) shows a remote terminal (remote UE) that performs data transmission and reception with a base station or another terminal through the support of sidelink relay. do.

The UE3 650 may obtain authentication information or service information required to perform sidelink relay-based communication as a relay terminal. The authentication information or service information may be obtained from a core network or an OAM method. The UE4 680 may obtain authentication information or service information required to perform sidelink relay-based communication as a remote terminal. The authentication information or service information may be obtained from a core network or an OAM method.

The UE4 680 may transmit a sidelink relay discovery message, for example, a second message in step 651 . In step 651, the sidelink relay discovery message (second message) transmitted by the UE4 680 may include a discovery solicitation message. When it is determined that the transmission condition of the second message is satisfied, the UE4 680 may configure the second message and transmit the second message in step 651 . In various embodiments, the second message may be transmitted for the purpose of discovering a relay terminal capable of relaying a service message desired by the remote terminal.

When it is determined that the second message has been received from the UE4 680 , the UE3 650 may process the received second message. UE3 650 may transmit a sidelink relay discovery message, eg, a third message, in response to the second message. The sidelink relay discovery message (third message) may include a discovery message. In various embodiments, the third message may be used for the purpose of notifying the existence of a relay terminal capable of relaying a service message desired by the remote terminal when the relay terminal receives the second message from the remote terminal. In an embodiment, when the condition for transmitting the third message is satisfied, the UE3 650 may configure the third message and transmit the third message to the UE4 680 in step 653 . UE4 680 may process the third message when the third message transmitted from UE3 650 is received.

UE3 650 and UE4 680 transmit and receive configuration information necessary for transmitting and receiving sidelink relay discovery messages, for example, configuration information necessary for transmitting and receiving a first message, a second message, or a third message. can be obtained The configuration information necessary for receiving the sidelink relay discovery message includes reception resource configuration (eg, frequency, bandwidth part, resource pool), target service of the sidelink relay discovery message, target group, target destination, target PQI list, target QoS parameter set It may include at least one of list, sidelink relay discovery message monitoring condition setting, and sidelink relay discovery message reception time interval setting information. The configuration information required for transmitting a sidelink relay discovery message is a transmission resource configuration (eg, frequency, bandwidth part, resource pool), a configuration necessary to select a transmission resource (eg, a scheduling resource of a base station or UE3 or UE4 directly selects a resource) ), power control for sidelink relay discovery message transmission, transmission parameter, retransmission parameter, MCS information, target service of sidelink relay discovery message, target group, target destination, target PQI list, target QoS parameter It may include at least one of the set lists.

In an embodiment of the present disclosure, the sidelink relay discovery message may be configured to be transmitted periodically. In an embodiment of the present disclosure, the sidelink relay discovery message may be configured to be transmitted as a one-shot transmission when a condition set to the UE3 650 and UE4 680 is satisfied or to be transmitted according to a predetermined period. .

According to an embodiment of the present disclosure, the relay discovery message (the first message, the second message, or the third message) used by the relay terminal and the remote terminal in the sidelink relay discovery procedure in FIGS. 6A to 6B is configured as follows. can The relay discovery message may include at least one of the listed information with reference to [Table 1] below.

(information that may be included in the first message or the third message)
- the services that Relay UE can relay. (service ID, SL flow ID, SRC ID, DST ID, unicast link ID, PQI, SLRB ID, cast type)
- the groups that Relay UE belongs to
- the possible DNNs/S-NSSAIs for the service relayed by Relay UE
- the serving PLMN for Relay UE
- the relay UE pre-configured in the remote UE
- QoS parameter set of the service that Relay can support

(information that may be included in the second message)
- the service that remote UE request to relay (service ID, SL flow ID, SRC ID, DST ID, unicast link ID, PQI, SLRB ID, group ID, cast type)
- QoS parameter set of the service that remote UE request to relay
- the serving PLMN for remote UE
- the groups that Remote UE belongs to

In an embodiment, the second message may include resource pool information (eg, frequency, BWP, resource pool) through which the remote terminal can receive the third message of the relay terminal.

In one embodiment, the first message or the third message is configuration information for the remote terminal to perform sidelink relay terminal discovery (eg, relay discovery condition), the remote terminal performs sidelink relay terminal discovery and selects the relay terminal It can include configuration information (eg relay selection conditions).

In an embodiment, the first message or the third message is configuration information, resource information (eg, frequency, BWP, resource pool) used by the remote terminal to transmit a message requesting establishment of a direct connection with the sidelink relay terminal. may include at least one of

7 is a diagram illustrating a protocol structure of a sidelink relay discovery message according to an embodiment of the present disclosure.

Referring to FIG. 7 , the protocol structure of the sidelink relay discovery message may be composed of PHY 700 , MAC 710 , RLC 720 , PDCP 730 , and SL relay discovery 740 layers. The SL relay discovery 740 layer may configure information of a sidelink relay discovery message, for example, the first message, the second message, or the third message of FIGS. 6A and 6B .

According to an embodiment of the present disclosure, a sidelink transmission resource pool for a relay terminal or a remote terminal to transmit a sidelink relay discovery message or a sidelink reception resource pool for receiving a sidelink relay discovery message is general sidelink data or sidelink It may be set in the same resource pool as the transmission resource pool or the reception resource pool for transmitting and receiving signaling. Or according to another embodiment, the sidelink transmission resource pool for the relay terminal or the remote terminal to transmit the sidelink relay discovery message or the sidelink reception resource pool for receiving the sidelink relay discovery message is general sidelink data or sidelink It may be set in a resource pool separate from a transmission resource pool or a reception resource pool for transmitting and receiving signaling. The resource for transmitting the sidelink relay discovery message may be allocated from the base station to the relay terminal or the remote terminal from the sidelink transmission resource pool, or may be directly selected and allocated by the relay terminal or the remote terminal.

According to various embodiments of the present disclosure, an operation in which a relay terminal or a remote terminal is allocated a transmission resource for transmission of a sidelink relay discovery message from a base station may include the following.

(1) An operation in which the terminal transmits a signaling requesting a transmission resource for transmission of a sidelink relay discovery message to the base station (eg, a sidelink buffer status report) and an operation in which a transmission resource is allocated from the base station

(2) The base station is configured to the terminal to periodically or semi-persistently allocate the transmission resource for transmission of the sidelink relay discovery message (eg, sidelink configured grant type 1 configuration or sidelink configured grant type 2 configuration) operation of allocating transmission resources to the terminal based on the setting

According to various embodiments of the present disclosure, an operation in which a relay terminal or a remote terminal directly selects and receives a transmission resource for transmission of a sidelink relay discovery message may include the following.

(1) An operation in which the terminal senses a resource pool set for the purpose of transmitting a sidelink relay discovery message and selects and allocates a resource

(2) operation of the terminal selecting and allocating a random resource from the resource pool set for the purpose of transmitting the sidelink relay discovery message

According to an embodiment, the terminal may obtain an SL discovery resource configuration that can be used to transmit a sidelink relay discovery message from signaling of the base station or preset information. The SL discovery resource configuration may include at least one of the parameters listed in the following [Table 2], and the SL discovery resource configuration may be described with reference to the contents of [Table 2].

SL discovery resource pool (TX, RX) //사이드링크 릴레이 탐색 메시지 전송 자원 풀, 사이드링크 릴레이 탐색 메시지 수신 자원 풀

SL discovery specific resource pool (TX, RX) //사이드링크 릴레이 탐색 용도로 별도로 정의된 송신, 수신 자원 풀

SL discovery and SL data common resource pool (TX, RX) // 사이드링크 릴레이 탐색 및 일반적인 사이드링크 메시지 용도로 정의된 송신, 수신 자원 풀

SL discovery period //사이드링크 릴레이 탐색 주기. 이 주기는 사이드링크 릴레이 탐색 메시지를 모니터링(수신)하는 주기, 사이드링크 릴레이 탐색 메시지를 전송하는 주기를 지시하는 데 사용될 수 있다.

If discoveryRXPool is configured, from the next SL discovery period, UE use the resources indicated by discovery RX pool for SL relay discovery monitoring //사이드링크 릴레이 탐색 메시지 수신 풀이 설정되어 있다고 판단되면, 단말은 다음 SL discovery period부터 사이드링크 릴레이 탐색 메시지를 모니터링하기 위해 사이드링크 릴레이 탐색 메시지 용도로 설정된 수신 자원 풀의 자원을 모니터링할 수 있다.

If discoveryTXPool is configured, from the next discovery period, UE use the resources indicated by discovery TX pool for SL relay discovery transmission //사이드링크 릴레이 탐색 메시지 전송 풀이 설정되어 있다고 판단되면, 단말은 다음 SL discovery period부터 사이드링크 릴레이 탐색 메시지를 전송하기 위해 사이드링크 릴레이 탐색 메시지 용도로 설정된 송신 자원 풀의 자원을 사용할 수 있다.

If release indicated, from the next discovery period, UE release the resources allocated for SL relay discovery transmission which is previously configured //사이드링크 릴레이 탐색 메시지 전송 풀이 해제되어 있다고 판단되면, 단말은 다음 SL discovery period부터 사이드링크 릴레이 탐색 메시지 전송 용도로 설정되어 있는 자원을 해제하기로 판단할 수 있다.

Discovery gap //단말이 사이드링크 릴레이 탐색 메시지 전송 또는 수신과 기지국과의 Uu 통신을 동시에 수행하지 못한다고 판단되는 경우를 위해 단말에게 discovery gap (송신 갭, 수신 갭 중 적어도 하나)을 설정해 줄 수 있다.

If discoveryGapRX is configured, from the next gap period, UE use the gaps indicated by the configuration for SL relay discovery monitoring //수신갭이 설정되었다고 판단되면 단말은 다음 gap period부터 사이드링크 릴레이 탐색 메시지를 모니터링하도록 설정된 discovery gap의 동작을 수행할 수 있다. 단말은 discovery gap구간에서 사이드링크 릴레이 탐색 메시지를 모니터링할 수 있다.

If discoveryGapTX is configured, from the next gap period, UE use the gaps indicated by the configuration for SL relay discovery transmission //송신갭이 설정되었다고 판단되면, 단말은 다음 gap period부터 사이드링크 릴레이 탐색 메시지를 전송하도록 설정된 discovery gap의 동작을 수행할 수 있다. 단말은 discovery gap 구간에서 사이드링크 릴레이 탐색 메시지를 송신할 수 있다.

TX parameter configuration for discovery message //전송 단말은 사이드링크 릴레이 탐색 메시지를 전송할 때 설정되어 있는 TX parameter를 적용하여 메시지를 전송할 수 있다. TX parameter는 TX power, HARQ 재전송 여부 및 횟수, MCS 정보 중 적어도 하나를 포함할 수 있다.

TX power, HARQ retransmission, MCS

Synchronization configuration for discovery message //사이드링크 릴레이 탐색 메시지 전송, 수신에서 단말이 적용할 동기화 설정 정보를 포함한다. 동기화 설정 정보를 기반으로 사이드링크 릴레이 탐색 메시지 전송, 수신에서 단말이 GNSS, gNB, eNB, other UE 중 적어도 하나에 대해 동기화를 처리할 수 있다.

SL discovery resource pool (TX, RX) //sidelink relay discovery message transmission resource pool, sidelink relay discovery message reception resource pool

SL discovery specific resource pool (TX, RX) // Transmit and receive resource pools defined separately for sidelink relay discovery

SL discovery and SL data common resource pool (TX, RX) // Transmit and receive resource pool defined for sidelink relay discovery and general sidelink message purposes

SL discovery period //sidelink relay discovery period. This period may be used to indicate a period for monitoring (receiving) a sidelink relay discovery message and a period for transmitting a sidelink relay discovery message.

If discoveryRXPool is configured, from the next SL discovery period, UE use the resources indicated by discovery RX pool for SL relay discovery monitoring In order to monitor the relay discovery message, it is possible to monitor the resources of the reception resource pool set for the sidelink relay discovery message purpose.

If discoveryTXPool is configured, from the next discovery period, UE use the resources indicated by discovery TX pool for SL relay discovery transmission In order to transmit the discovery message, the resource of the transmission resource pool set for the purpose of the sidelink relay discovery message may be used.

If release indicated, from the next discovery period, UE release the resources allocated for SL relay discovery transmission which is previously configured It may be determined to release the resource set for the message transmission purpose.

Discovery gap // A discovery gap (at least one of a transmission gap and a reception gap) may be set for the terminal in case it is determined that the terminal cannot simultaneously transmit or receive a sidelink relay discovery message and perform Uu communication with the base station.

If discoveryGapRX is configured, from the next gap period, UE use the gaps indicated by the configuration for SL relay discovery monitoring operation can be performed. The UE may monitor the sidelink relay discovery message in the discovery gap period.

If discoveryGapTX is configured, from the next gap period, UE use the gaps indicated by the configuration for SL relay discovery transmission The operation of gap can be performed. The UE may transmit a sidelink relay discovery message in the discovery gap period.

TX parameter configuration for discovery message // The transmitting terminal may transmit the message by applying the TX parameter set when transmitting the sidelink relay discovery message. The TX parameter may include at least one of TX power, whether or not to retransmit HARQ, and MCS information.

TX power, HARQ retransmission, MCS

Synchronization configuration for discovery message //Includes synchronization configuration information to be applied by the UE in transmission and reception of the sidelink relay discovery message. In transmission and reception of a sidelink relay discovery message based on synchronization configuration information, the UE may process synchronization with respect to at least one of GNSS, gNB, eNB, and other UEs.

Next, an operation of a terminal (relay terminal, remote terminal) transmitting a sidelink relay discovery message will be described with reference to FIGS. 8A to 8B . The sidelink relay discovery message may include at least one of the messages transmitted in FIGS. 6A to 6B .

8A is a flowchart illustrating a transmission resource allocation processing operation for transmitting a sidelink relay discovery message according to an embodiment of the present disclosure.

Referring to FIG. 8A , in step 801 , the terminal may determine whether the transmission condition of the sidelink relay discovery message is satisfied. In step 803, the terminal may determine whether a mode in which the base station allocates a sidelink transmission resource for transmitting a sidelink relay discovery message is set. According to the determination in step 803, if the mode assigned by the base station is set, the terminal may proceed to step 805 . In step 805, the terminal may determine whether a configured grant transmission resource for transmission of the sidelink relay discovery message is configured from the base station to the terminal. Here, the UE may determine whether a configured grant transmission resource is configured for a logical channel corresponding to the sidelink relay discovery message. The configured grant (configured grant) transmission resource is configured grant type 1 (time information or frequency information of actual sidelink resource allocation for the logical channel in addition to indication information on which configured grant resource configuration to use for the logical channel) The type indicated by the RRC message) or configured grant type 2 (indicating information on which configured grant resource configuration to use for the logical channel is indicated by the RRC message, and the actual sidelink resource allocation for the logical channel The time information or frequency information of may include a type indicated by PDCCH). In step 807, the UE may determine whether a configured grant transmission resource is configured for a logical channel for the sidelink relay discovery message. If it is determined that the configured grant transmission resource for the logical channel for the sidelink relay discovery message is configured, use the corresponding configured grant transmission resource in step 809 to transmit the sidelink relay discovery message. can be judged as

The configured grant transmission resource configuration information required for transmission of the sidelink relay discovery message set by the base station to the terminal may include the parameters listed in [Table 3] and [Table 4], and the configured grant (configured grant) ) The following [Table 3] and [Table 4] can be referred to for the description of the transmission resource setting information.

SL-DiscoveryConfiguredGrantConfigList ::= SEQUENCE {
sl-DiscoveryConfiguredGrantConfigToReleaseList SEQUENCE (SIZE (1..maxNrofDiscoveryCG-SL)) OF SL-DiscoveryConfigIndexCG OPTIONAL, -- Need N
sl-DiscoveryConfiguredGrantConfigToAddModList SEQUENCE (SIZE (1..maxNrofDiscoveryCG-SL)) OF SL-DiscoveryConfiguredGrantConfig OPTIONAL -- Need N
}
The base station may provide the terminal with a configuration including at least one of adding, modifying, and releasing a configured grant configuration to be used for the sidelink relay discovery message. Detailed information of the configured grant configuration provided by the base station to the terminal may include SL-DiscoveryConfiguredGrantConfig. The SL-DiscoveryConfiguredGrantConfig may include at least one of a configured grant type 1 method resource allocation setting or a configured grant type 2 method resource allocation setting to be used in sidelink relay discovery message transmission.

SL-DiscoveryConfiguredGrantConfig ::= SEQUENCE {
sl-DiscoveryConfigIndexCG SL-DiscoveryConfigIndexCG, // indicates the index of the configured grant type 1 or configured grant type 2
sl-CGPeriod SL-CGPeriod OPTIONAL, -- Need M // Indicate the configured grant type 1 or configured grant type 2 resource allocation period (configured grant period).
When the base station sets the configured grant period value, it may be set based on the SL-discoveryPeriod value of the sidelink relay discovery message transmission resource pool, and may be set as a value separate from the SL-discoveryPeriod. When the sl-CGPeriod value is set based on the SL-discoveryPeriod value of the sidelink relay discovery message transmission resource pool, the base station may include index information of the corresponding sidelink relay discovery message transmission resource pool in the configuration information. SL-discoveryPeriod may include the SL discovery period of [Table 2].

sl-NrOfHARQ-Processes INTEGER (1..16) OPTIONAL, -- Need M //Number of HARQ processes to be applied to sidelink relay discovery message transmission
sl-HARQ-ProcID-offset INTEGER (1..16) OPTIONAL, -- Need M //HARQ process offset to apply to sidelink relay discovery message transmission
sl-CG-MaxTransNumList SL-CG-MaxTransNumList OPTIONAL, -- Need M //Maximum number of transmissions to apply to sidelink relay discovery message transmission
rrc-ConfiguredSidelinkGrant SEQUENCE {
sl-TimeResourceCG-Type1 INTEGER (0..496) OPTIONAL, -- Need M
sl-StartSubchannelCG-Type1 INTEGER (0..26) OPTIONAL, -- Need M
sl-FreqResourceCG-Type1 INTEGER (0..6929) OPTIONAL, -- Need M
sl-TimeOffsetCG-Type1 INTEGER (0..7999) OPTIONAL, -- Need R
sl-ResourcePoolID SL-ResourcePoolID OPTIONAL, -- Need M // Indication information on the sidelink transmission resource pool to which the configured grant to transmit the sidelink relay discovery message is applied
sl-TimeReferenceSFN-Type1 ENUMERATED {sfn512} OPTIONAL -- Need S
} OPTIONAL, -- Need M // Fields marked with Type1 correspond to actual resource allocation information of grant type 1 configured for sidelink relay discovery message transmission.
...
}
When the base station sets the maximum transmission number of sidelink relay discovery message transmission to the terminal, the base station may set to use the value of numRetx of the sidelink relay discovery message transmission resource pool as the maximum transmission number of sidelink relay discovery message transmission. . The base station may set a separate field as follows instead of instructing the terminal to numRetx of the sidelink relay discovery message transmission resource pool.

SL-CG-MaxTransNumList ::= SEQUENCE (SIZE (1..8)) OF SL-CG-MaxTransNum
SL-CG-MaxTransNum ::= SEQUENCE {
sl-Priority INTEGER (1..8) OPTIONAL, // When fixed priority is set for the sidelink relay discovery message, the base station does not need to set this field to the terminal.
sl-MaxTransNum INTEGER (1..32)
}

Here, an example of setting the parameters listed in [Table 3] will be described in detail.

sl-CGPeriod값 즉, SL CG period for CG Type 1와 SL CG period for CG Type 2는 사이드링크 릴레이 탐색 메시지 전송 용도로 설정된 사이드링크 전송 자원 풀의 SL discovery period와 어라인(align)되도록 설정될 수 있다. 즉, SL CG period for CG Type 1와 SL CG period for CG Type 2는 SL discovery period와 동일한 값이거나 SL discovery period의 정수 배 값으로 설정될 수 있다. SL discovery period는 [표 2]의 SL discovery period를 포함할 수 있다.

The sl-CGPeriod value, that is, the SL CG period for CG Type 1 and the SL CG period for CG Type 2 may be set to align with the SL discovery period of the sidelink transmission resource pool set for the purpose of transmitting the sidelink relay discovery message. have. That is, the SL CG period for CG Type 1 and the SL CG period for CG Type 2 may be set to the same value as the SL discovery period or an integer multiple of the SL discovery period. The SL discovery period may include the SL discovery period of [Table 2].

sl-CGPeriod값 즉, SL CG period for CG Type 1와 SL CG period for CG Type 2는 사이드링크 릴레이 탐색 메시지의 SL discovery TX gap pattern과 어라인(align)되도록 설정될 수 있다. SL discovery TX gap pattern이 단말에게 설정되어 있는 경우 기지국은 해당 단말의 SL discovery TX gap pattern 즉 SL discovery TX를 전송할 수 있는 시점을 판단하여 sl-CGPeriod값을 설정할 수 있다. 기지국은 해당 단말에게 sl-CGPeriod값을 SL discovery TX gap pattern의 gap period와 동일한 값 또는 gap period의 정수 배 값으로 설정해 줄 수 있다. Gap period는 [표 2]의 gap period를 포함할 수 있다.

The sl-CGPeriod values, that is, SL CG period for CG Type 1 and SL CG period for CG Type 2 may be set to align with the SL discovery TX gap pattern of the sidelink relay discovery message. When the SL discovery TX gap pattern is set for the terminal, the base station may determine the SL discovery TX gap pattern of the corresponding terminal, that is, a time point at which SL discovery TX can be transmitted, and set the sl-CGPeriod value. The base station may set the sl-CGPeriod value to the corresponding terminal as the same value as the gap period of the SL discovery TX gap pattern or an integer multiple of the gap period. The gap period may include the gap period of [Table 2].

기지국이 SL-CGPeriod, SL discovery TX gap pattern의 gap period, SL discovery period 중 적어도 하나에 대해 주기(period) 정보를 결정하기 위해 단말로부터 도움 정보를 제공받을 수 있다. 단말의 도움 정보는 SidelinkUEInformation 메시지 또는 UEAssistanceInformation 메시지 중 적어도 하나를 이용하여 기지국으로 전송될 수 있다. 사이드링크 릴레이 단말 또는 사이드링크 리모트 단말로서 인증된 단말은 사이드링크 릴레이 탐색 메시지 전송에 필요한 SL-CGPeriod, SL discovery TX gap pattern, SL discovery period에 필요한 도움 정보를 전송할 수 있도록 설정된 경우, 도움 정보를 기지국에게 전송할 수 있다. 사이드링크 릴레이 단말, 사이드링크 리모트 단말은 사이드링크 릴레이 탐색 메시지를 전송하는 조건이 만족된다고 판단되면 도움 정보를 기지국에게 전송할 수 있다. 이 도움 정보는 단말이 기지국에게 사이드링크 릴레이 탐색 메시지의 전송 자원 할당, 사이드링크 릴레이 탐색 메시지의 gap 설정을 요청하는 용도로 사용될 수 있다. 기지국은 단말의 도움 정보를 참고하여 단말의 사이드링크 릴레이 탐색 메시지 전송 자원 할당, 사이드링크 릴레이 탐색 메시지의 TX gap 설정 또는 RX gap 설정을 결정하고 단말에게 제공할 수 있다.

In order for the base station to determine period information for at least one of SL-CGPeriod, a gap period of an SL discovery TX gap pattern, and an SL discovery period, help information may be provided from the terminal. The assistance information of the terminal may be transmitted to the base station using at least one of a SidelinkUEInformation message or a UEAssistanceInformation message. If the terminal authenticated as a sidelink relay terminal or a sidelink remote terminal is configured to transmit assistance information necessary for SL-CGPeriod, SL discovery TX gap pattern, and SL discovery period necessary for transmitting a sidelink relay discovery message, the assistance information is transmitted to the base station can be sent to The sidelink relay terminal and the sidelink remote terminal may transmit help information to the base station when it is determined that the condition for transmitting the sidelink relay discovery message is satisfied. This help information may be used for the purpose of the terminal requesting the base station to allocate a transmission resource of the sidelink relay discovery message and set the gap of the sidelink relay discovery message. The base station may determine the terminal's sidelink relay discovery message transmission resource allocation, the TX gap configuration or the RX gap configuration of the sidelink relay discovery message with reference to the terminal's help information, and provide it to the terminal.

단말이 전송하는 사이드링크 릴레이 탐색 메시지를 위한 도움 정보는 다음 중 적어도 하나 또는 조합을 포함할 수 있다. carrier frequency (단말의 사이드링크 릴레이 탐색을 지원하는 주파수 정보), gap pattern 정보 (단말이 선호하는 gap pattern 정보이며 gap period list, gap offset, gap bitmap 중 적어도 하나로 구성될 수 있다. Gap period list는 gap 주기 정보를 나타내며 gap bitmap이 포함되는 경우 gap bitmap의 반복 주기를 나타낼 수 있다. Gap offset은 첫번째 gap period가 시작되는 오프셋을 나타내며 SFN 0으로부터의 오프셋으로 표기될 수 있다. Gap bitmap은 사이드링크 릴레이 탐색 메시지를 전송할 수 있는 시간자원(예, 서브프레임, 슬랏, 심볼 중 적어도 하나로 구성)을 나타낼 수 있다), discovery period에서 전송할 사이드링크 릴레이 탐색 메시지 개수, discovery period에서 전송할 사이드링크 릴레이 탐색 메시지 크기 (예를 들어, 사이드링크 릴레이 탐색 메시지 크기는 가변적일 수 있으므로 평균 값을 제공하거나 최대 값을 제공할 수 있다)

The help information for the sidelink relay discovery message transmitted by the terminal may include at least one or a combination of the following. carrier frequency (frequency information supporting the terminal's sidelink relay discovery), gap pattern information (gap pattern information preferred by the terminal and may consist of at least one of a gap period list, a gap offset, and a gap bitmap. The gap period list is a gap It indicates period information and may indicate the repetition period of the gap bitmap if the gap bitmap is included. Gap offset indicates the offset at which the first gap period starts and may be expressed as an offset from SFN 0. The gap bitmap is a sidelink relay search. It may indicate a time resource (eg, composed of at least one of a subframe, a slot, and a symbol) capable of transmitting a message), the number of sidelink relay discovery messages to be transmitted in the discovery period, and the size of a sidelink relay discovery message to be transmitted in the discovery period (eg, the number of sidelink relay discovery messages to be transmitted in the discovery period) For example, the sidelink relay discovery message size can be variable, giving an average value or a maximum value)

기지국은 단말에게 사이드링크 릴레이 탐색 메시지 전송 용도의 configured grant를 설정할 때 SL-CGPeriod를 다음 중 적어도 하나의 방법으로 설정해 줄 수 있다. SL-CGPeriod는 SL discovery period를 활용하여 설정될 수 있다. 기지국은 SL discovery period에 해당되는 SL discovery period index와 SL-CGPeriod의 매핑 정보를 단말에게 제공할 수 있다. 상기 SL-CGPeriod정보는 한 개 이상을 포함할 수 있다. SL-CGPeriod는 SL discovery period와 별도로 설정될 수 있다. 기지국은 SL-CGPeriod 값을 설정하여 단말에게 제공할 수 있다. 상기 SL-CGPeriod정보는 한 개 이상을 포함할 수 있다. 기지국은 사이드링크 릴레이 탐색 모델 A(도 6a), 사이드링크 릴레이 탐색 모델 B(도 6b)에서 사용되는 사이드링크 릴레이 탐색 메시지의 논리채널에 대해 동일한 configured grant 설정을 해줄 수 있고, 탐색 모델에서 사용되는 사이드링크 릴레이 탐색 메시지의 논리채널별로 다른 configured grant 설정을 해줄 수 있다. 기지국은 단말에게 사이드링크 릴레이 탐색 메시지의 논리채널과 이에 대해 매핑되는 configured grant 설정을 제공할 수 있다.

The base station may set the SL-CGPeriod by at least one of the following methods when setting a configured grant for transmitting a sidelink relay discovery message to the terminal. SL-CGPeriod may be set using the SL discovery period. The base station may provide the terminal with mapping information of the SL discovery period index and SL-CGPeriod corresponding to the SL discovery period. The SL-CGPeriod information may include one or more. SL-CGPeriod may be set separately from the SL discovery period. The base station may set the SL-CGPeriod value and provide it to the terminal. The SL-CGPeriod information may include one or more. The base station can set the same configured grant for the logical channel of the sidelink relay discovery message used in the sidelink relay discovery model A (FIG. 6a) and the sidelink relay discovery model B (FIG. 6b), and is used in the discovery model It is possible to set a different configured grant for each logical channel of the sidelink relay discovery message. The base station may provide the terminal with the logical channel of the sidelink relay discovery message and the configured grant configuration mapped thereto.

단말은 기지국으로부터 사이드링크 릴레이 탐색 메시지의 논리채널에 대응되는 configured grant 설정 정보를 획득하면, 단말이 전송하기로 판단한 사이드링크 릴레이 탐색 메시지의 논리채널에 매핑되는 configured grant 설정 정보에 따라 사이드링크 전송 자원을 획득하여 사이드링크 릴레이 탐색 메시지를 전송할 수 있다.

When the terminal acquires the configured grant configuration information corresponding to the logical channel of the sidelink relay discovery message from the base station, the sidelink transmission resource according to the configured grant configuration information mapped to the logical channel of the sidelink relay discovery message determined by the terminal to be transmitted can be obtained to transmit a sidelink relay discovery message.

The base station may designate a configured grant setting mapped to a logical channel corresponding to the sidelink relay discovery message. Here, the sidelink relay discovery message may include one or more. The base station may designate a configured grant setting mapped to a logical channel corresponding to a sidelink relay discovery message corresponding to the sidelink relay discovery models ( FIGS. 6A and 6B ). For example, the base station may designate to use the grant configuration configured for the logical channel corresponding to the sidelink relay discovery message used in FIG. 6A. The terminal acquires the configured grant setting mapped to the logical channel corresponding to the sidelink relay discovery message from the base station, and can use the configured grant when transmitting the sidelink relay discovery message corresponding to the logical channel indicated by the configured grant configuration information. Here, the logical channel may include one or more. Here, the configured grant may include one or more. The configured grant setting mapped to the logical channel corresponding to the sidelink relay discovery message set by the base station to the terminal may include the parameters listed in [Table 4], and may be described based on the contents of [Table 4].

The base station may configure at least one information of configured grant type 1 or configured grant type 2 to be used in the logical channel corresponding to the sidelink relay discovery message to the terminal. Information of configured grant type 1 or configured grant type 2 configured for the logical channel may be indicated by SL-DiscoveryConfigIndexCG. SL-DiscoveryConfigIndexCG corresponds to the index of the corresponding DiscoveryConfiguredGrantConfig in [Table 3].

SL-DiscoveryLogicalChannelConfig ::= SEQUENCE {
sl-DiscoveryLCH ENUMERATED {SCCH-A, SCCH-B, SCCH-A_SCCH-B} OPTIONAL, -- Need R // Information indicating a logical channel corresponding to the sidelink relay discovery message. Here, a case in which there are two logical channels corresponding to the sidelink relay discovery message (SCCH-A and SCCH-B) is considered. When SCCH-A is set, it indicates that the grant setting configured for the SCCH-A logical channel is applied, when SCCH-B is set, it indicates that the grant setting configured for the SCCH-B logical channel is applied, when SCCH-A_SCCH-B is set It indicates that the grant configuration configured for the SCCH-A logical channel and the SCCH-B logical channel is applied. Of course, the number of logical channels corresponding to the sidelink relay discovery message may be less than two or more than two, and this parameter may be extended to information indicating one logical channel or several logical channels.
sl-DiscoveryConfiguredGrantType1Allowed ENUMERATED {true} OPTIONAL, -- Need R // If this field value is true, it indicates that the configured grant type 1 resource can be used for the logical channel corresponding to the sidelink relay discovery message.
sl-DiscoveryConfiguredGrantType2Allowed ENUMERATED {true} OPTIONAL, -- Need R // If this field value is true, it indicates that the configured grant type 2 resource can be used for the logical channel corresponding to the sidelink relay discovery message.
sl-AllowedDiscoveryCG-List SEQUENCE (SIZE (0..maxNrofDiscoveryCG-SL-1)) OF SL-DiscoveryConfigIndexCG OPTIONAL, -- Need R //Used for the logical channel corresponding to the sidelink relay discovery message (the indicated logical channel) Index for setting possible configured grant methods (at least one of type 1 and type 2)
...
}

Here, an example of setting the parameters of [Table 4] will be described in detail.

sl-DiscoveryLCH 파라미터는 사이드링크 릴레이 탐색 메시지들에 대해 하나보다 많은 sidelink logical channel(SL LCH)를 설정하는 경우, 예를 들어, model A절차에서 사용되는 사이드링크 릴레이 탐색 메시지에 설정되는 SL LCH (SCCH-A)와 model B 절차에서 사용되는 사이드링크 릴레이 탐색 메시지에 설정되는 SL LCH (SCCH-B)가 다르게 설정되는 경우에서 각 SL LCH에 대해 설정하는 configured grant를 구분하는 용도로 사용될 수 있다. SL-DiscoveryLCH 파라미터는 사이드링크 릴레이 탐색 메시지들에 대해 1개의 sidelink logical channel을 설정하는 경우, 예를 들어, model A절차와 model B 절차에서 사용되는 사이드링크 릴레이 탐색 메시지에 설정되는 SL LCH가 동일하게 설정 (SCCH-A) 되는 경우에서는 포함되지 않아도 된다.

When setting more than one sidelink logical channel (SL LCH) for sidelink relay discovery messages, the sl-DiscoveryLCH parameter is, for example, an SL LCH (SCCH) set in a sidelink relay discovery message used in the model A procedure. -A) and in the case where the SL LCH (SCCH-B) configured in the sidelink relay discovery message used in the model B procedure is configured differently, it can be used to distinguish the configured grant configured for each SL LCH. When the SL-DiscoveryLCH parameter configures one sidelink logical channel for sidelink relay discovery messages, for example, the SL LCH set in the sidelink relay discovery message used in the model A procedure and the model B procedure is the same. In the case of being set (SCCH-A), it does not need to be included.

sl-DiscoveryConfiguredGrantType1Allowed 파라미터는 사이드링크 릴레이 탐색 메시지에 설정된 SL LCH에 대해 SL CG type 1 사용하도록 설정하는 것을 의미할 수 있다.

The sl-DiscoveryConfiguredGrantType1Allowed parameter may mean setting to use SL CG type 1 for the SL LCH configured in the sidelink relay discovery message.

사이드링크 릴레이 탐색 메시지들에 대해 한 개 이상의 LCH를 설정하는 경우, 단말은 전송할 사이드링크 릴레이 탐색 메시지에 해당되는 LCH에게 SL CG type 1을 사용하도록 설정되어 있는지 확인한 후, SL CG type 1 사용을 판단할 수 있다.

When one or more LCHs are configured for sidelink relay discovery messages, the UE determines whether SL CG type 1 is set for the LCH corresponding to the sidelink relay discovery message to be transmitted, and then determines to use SL CG type 1 can do.

sl-DiscoveryConfiguredGrantType2Allowed 파라미터는 사이드링크 릴레이 탐색 메시지에 설정된 SL LCH에 대해 SL CG type 2 사용하도록 설정하는 것을 의미할 수 있다.

The sl-DiscoveryConfiguredGrantType2Allowed parameter may mean setting to use SL CG type 2 for the SL LCH configured in the sidelink relay discovery message.

사이드링크 릴레이 탐색 메시지들에 대해 한 개 이상의 LCH를 설정하는 경우, 단말은 전송할 사이드링크 릴레이 탐색 메시지에 해당되는 LCH에게 SL CG type 2를 사용하도록 설정되어 있는지 확인한 후, SL CG type 2 사용을 판단할 수 있다.

When one or more LCHs are configured for sidelink relay discovery messages, the UE determines whether SL CG type 2 is set to be used for the LCH corresponding to the sidelink relay discovery message to be transmitted, and then determines the use of SL CG type 2 can do.

Sl-DiscoveryConfiguredCG-List 파라미터는 사이드링크 릴레이 탐색 메시지에 설정된 SL LCH에 대해 사용할 SL CG를 알려주는 정보를 나타낼 수 있다. 단말은 SL CG index와 매핑된 SL CG 설정을 확인할 수 있다.

The Sl-DiscoveryConfiguredCG-List parameter may indicate information indicating the SL CG to be used for the SL LCH configured in the sidelink relay discovery message. The UE may check the SL CG index and the mapped SL CG setting.

사이드링크 릴레이 탐색 메시지들에 대해 한 개 이상의 LCH를 설정하는 경우, 단말은 전송할 사이드링크 릴레이 탐색 메시지에 해당되는 LCH에게 설정된 SL CG 정보를 확인할 수 있고, 해당 LCH의 사이드링크 릴레이 탐색 메시지 전송 시에 사용하도록 허용된 경우에 이 SL CG를 사용할 수 있다.

When one or more LCHs are configured for sidelink relay discovery messages, the UE can check SL CG information configured for the LCH corresponding to the sidelink relay discovery message to be transmitted, and when transmitting the sidelink relay discovery message of the corresponding LCH You may use this SL CG if you are permitted to use it.

If the terminal determines that the grant transmission resource configured for the logical channel for the sidelink relay discovery message is not set in step 807, it can be determined to use the dynamic grant transmission resource in step 811 for transmitting the sidelink relay discovery message. have. In step 811, the terminal determines that the terminal uses the dynamic grant transmission resource, and may perform an operation according to the presence or absence of the transmission resource allocated by the base station in the dynamic grant method as follows. For example, if it is determined that there is a transmission resource allocated by the base station in the dynamic grant method, the terminal may transmit a sidelink relay discovery message using the resource. For another example, if it is determined that there is no transmission resource allocated by the base station in the dynamic grant method, the terminal may perform a transmission resource request procedure for transmitting a sidelink relay discovery message (in this case, the terminal assigns SL-BSR to the base station) and can be allocated sidelink transmission resources from the base station)

If the terminal determines that the mode is not allocated by the base station according to the determination in step 803, the terminal may use the terminal direct allocation mode in step 813. In step 813, the terminal may determine whether the base station is configured to use the terminal direct allocation mode or may determine whether to use the terminal direct allocation mode without an instruction from the base station. When the base station instructs the terminal in the RRC_CONNECTED state to the terminal direct allocation mode, or when the terminal is located in one of the RRC_IDLE state / RRC_INACTIVE state / OUT OF COVERAGE state without an instruction from the base station to determine the terminal direct allocation mode, the terminal directs the terminal Allocation mode is available. Thereafter, the terminal proceeds to step 815 and may perform an operation of selecting a transmission resource from a resource pool set for transmission of a sidelink relay discovery message. An example of an operation in which the terminal selects a transmission resource from a resource pool configured for transmission of a sidelink relay discovery message is as follows. The UE may select an available resource by sensing the resource pool for transmitting the sidelink relay discovery message. Alternatively, the UE may select an arbitrary resource from the resource pool for transmitting the sidelink relay discovery message. If the SL discovery period is set in the resource pool set for the sidelink relay discovery message transmission, the UE uses the resource set for the sidelink relay discovery message transmission for the MAC PDU including the sidelink relay discovery message to be transmitted in the SL discovery period. A sidelink transmission resource may be allocated by sensing the pool. When the SL discovery period is set in the resource pool set for the sidelink relay discovery message transmission, the resource set for the sidelink relay discovery message transmission for the MAC PDU including the sidelink relay discovery message to be transmitted from the SL discovery period, which is the terminal. A sidelink transmission resource can be arbitrarily selected and allocated from the pool.

8B is a flowchart illustrating a resource allocation processing operation for transmitting a sidelink relay discovery message according to another embodiment of the present disclosure.

Referring to FIG. 8B , the terminal may determine in step 851 that the base station is set to a mode for allocating a sidelink relay discovery message transmission resource to the terminal. The base station may transmit information for setting permit or non-permit transmission of a configured grant for a logical channel corresponding to the sidelink relay discovery message to a terminal (relay UE or remote UE) capable of transmitting a sidelink relay discovery message. When multiple logical channels are configured for each sidelink relay discovery message, the base station transmits information for setting grant or non-permission configured for each logical channel to a terminal capable of transmitting a sidelink relay discovery message (relay UE or remote UE) ) can be sent to The configured grant setting for the logical channel corresponding to the sidelink relay discovery message may include indication information indicating that the configured grant type 1 and/or the configured grant type 2 is permitted or not. The configured grant configuration for the logical channel corresponding to the sidelink relay discovery message may include information on the allowed configured grant type 1 index list and/or the configured grant type 2 index list.

The terminal may determine that it is set to use the configured grant transmission resource for the sidelink relay discovery message in step 853. The setting information of step 853 may include information described in [Table 3] to [Table 4]. In step 855, the UE may determine whether the configured grant resource is set to use the logical channel corresponding to the sidelink relay discovery message that the UE intends to transmit. According to the determination of step 855, if the use of the configured grant resource is set for the logical channel corresponding to the sidelink relay discovery message (or if the configured grant resource is allowed), the terminal transmits the configured grant for the logical channel in step 857 It can be determined that the MAC PDU including the sidelink relay discovery message can be transmitted using the resource. According to the determination of step 855, if the use of the configured grant resource for the logical channel corresponding to the sidelink relay discovery message is not set (or the configured grant resource is not allowed), the terminal is configured for the logical channel in step 859 It can be determined that the grant transmission resource cannot be used and that the MAC PDU including the sidelink relay discovery message can be transmitted using the dynamic grant transmission resource. The terminal determined to use the dynamic grant transmission resource may perform an operation according to the presence or absence of the transmission resource allocated by the base station in the dynamic grant method as follows. For example, if there is a transmission resource allocated by the base station in the dynamic grant method, the terminal may transmit a sidelink relay discovery message using the resource. For another example, if there is no transmission resource allocated by the base station in the dynamic grant method, the terminal may perform a transmission resource request procedure for transmitting a sidelink relay discovery message (the terminal transmits an SL-BSR to the base station and It can receive transmission resource allocation from the base station)

Next, referring to FIG. 9 , the terminal (sidelink relay terminal, sidelink remote terminal) transmits at least one of a general sidelink message (PC5-S signaling, PC5-RRC message, PC5 user packet, and PC5 MAC CE) in addition to the sidelink relay discovery message. 1), an operation of processing resource allocation for transmission will be described.

9 is a flowchart illustrating a resource allocation processing operation for transmitting a sidelink message according to an embodiment of the present disclosure.

Referring to FIG. 9 , the terminal may determine that a sidelink message to be transmitted has occurred in step 901 . The terminal may determine whether a mode in which the base station allocates transmission resources to the terminal is set in step 903 . According to the determination of step 903, if the mode in which the base station allocates the transmission resource to the terminal is set, the terminal can determine in step 905 that the base station has set the grant transmission resource configured for the purpose of transmitting a sidelink message to the terminal. In step 907, the terminal may determine whether the configured grant transmission resource is set to use the logical channel corresponding to the sidelink message. According to the determination in step 907, if it is determined that the configured grant transmission resource is set to use the logical channel corresponding to the sidelink message, the terminal uses the allocated resource indicated by the configured grant transmission resource in step 909 to transmit a sidelink message. If the terminal determines that the configured grant transmission resource set in step 905 is not set to be used for the logical channel corresponding to the sidelink message, the terminal can transmit a sidelink message using the transmission resource allocated in the dynamic grant method. It can be judged that there is The terminal determined to use the dynamic grant transmission resource may perform an operation according to the presence or absence of the transmission resource allocated by the base station in the dynamic grant method as follows. For example, if there is a transmission resource allocated by the base station in the dynamic grant method, the terminal may transmit a sidelink message using the resource. For another example, if there is no transmission resource allocated by the base station in the dynamic grant method, the terminal may perform a transmission resource request procedure for transmitting a sidelink message (the terminal transmits an SL-BSR to the base station and receives the transmission resources can be allocated)

If it is determined in step 903 that the mode in which the base station allocates transmission resources to the terminal is not set, the terminal may proceed to step 913 and use the terminal direct allocation mode. In step 913, the terminal may determine whether the base station sets the mode for directly selecting the transmission resource to the terminal, or the terminal may determine whether to use the terminal direct allocation mode without an instruction from the base station. When the base station instructs the terminal in the RRC_CONNECTED state to the terminal direct allocation mode, or when the terminal is located in one of the RRC_IDLE state / RRC_INACTIVE state / OUT OF COVERAGE state without an instruction from the base station to determine the terminal direct allocation mode, the terminal directs the terminal Allocation mode is available. Thereafter, the terminal proceeds to step 915 and may perform an operation of selecting a transmission resource from a resource pool set for a sidelink message transmission purpose. An embodiment of an operation in which the terminal selects a transmission resource from a resource pool configured for sidelink message transmission is as follows. The UE may select an available resource by sensing the resource pool for sidelink message transmission. Alternatively, the UE may select an arbitrary resource from the resource pool for sidelink message transmission.

According to various embodiments of the present disclosure, general sidelink message transmission (PC5-RRC, PC5-S signaling, PC5 user packet, PC5 MAC CE) separately from CG type 1 or CG type2 resource allocation for transmitting a sidelink relay discovery message CG type 1 or CG type 2 resource may be allocated for the purpose (including at least one). The base station transmits at least one resource allocation configuration of CG type 1 or CG type 2 to the terminal for the purpose of transmitting a general sidelink message, and transmits the transmission resource to the terminal in at least one of CG type 1 or CG type 2 according to the configuration. can be assigned

The terminal (Remote UE or Relay UE) determines to transmit a sidelink relay discovery message or a general sidelink message, and allocates a CG type 1 or CG type 2 resource corresponding to a sidelink relay discovery message or a general sidelink message set by the base station settings can be determined.

A terminal transmitting a general sidelink message may transmit a general sidelink message using a CG type 1 or CG type 2 resource configured for a general sidelink message transmission purpose.

According to an embodiment of the present disclosure, when the priorities of sidelink MAC PDUs that can use the sidelink relay discovery message transmission resource are different, that is, the terminal has different priorities of the sidelink MAC PDU A and the sidelink MAC PDU B, and the SL If it is necessary to determine which MAC PDU to be transmitted preferentially among sidelink MAC PDU A and sidelink MAC PDU B in the discovery period, the UE may apply a preemption procedure to sidelink MAC PDU A and sidelink MAC PDU B. The preemption procedure may be applied even when the MAC PDU corresponding to the sidelink relay discovery message and the MAC PDU corresponding to the general sidelink message are allocated resources of the same transmission resource pool. The preemption procedure is performed when a transmission resource is reserved for a certain sidelink MAC PDU (sidelink relay discovery message or general sidelink message) and the corresponding transmission resource is available for another sidelink MAC PDU (sidelink relay discovery message or general sidelink message). sidelink message) or which sidelink MAC PDU is to be transmitted.

10 is a flowchart illustrating an operation of setting a sidelink relay discovery message transmission and reception setting according to an embodiment of the present disclosure.

Referring to FIG. 10 , in step 1001 , the terminal may determine whether a function of transmitting and/or receiving a sidelink relay discovery message is set. If the terminal determines that the sidelink relay discovery message transmission function is set, in step 1003, the terminal transmits the sidelink relay discovery message gap help information or/and the sidelink relay discovery message reception gap help information or/and the sidelink relay discovery message Transmission assistance information may be transmitted to the base station. The sidelink relay discovery message transmission help information transmitted by the terminal to the base station may be used as a sidelink relay discovery message transmission resource as help information for the base station to set the configured grant type 1 or / and configured grant type 2 to the terminal. At least one of the sidelink relay discovery message transmission gap help information, the sidelink relay discovery message reception gap help information, and the sidelink relay discovery message transmission help information transmitted from the terminal to the base station is transmitted through the same message or transmitted through a different message can be If the terminal determines that the sidelink relay discovery message reception function is set, in step 1005, the terminal may transmit sidelink relay discovery message reception gap help information to the base station. In step 1007, the terminal may obtain at least one of a sidelink relay discovery message transmission gap setting, a sidelink relay discovery message reception gap setting, and a configured grant setting that can be used for transmitting a sidelink relay discovery message from the base station in step 1007. The terminal receives at least one of sidelink relay discovery message transmission gap information, sidelink relay discovery message reception gap information, and configured grant settings that can be used for sidelink relay discovery message transmission from the base station through the same message or through a different message can do.

According to an embodiment of the present disclosure, a UE not in an RRC connection state performs an RRC connection establishment procedure to receive resource allocation and/or transmission and reception configuration information for transmitting and/or receiving a sidelink relay discovery message from a base station. can be done In this case, the terminal may determine whether it is authorized to operate as a sidelink relay terminal or to operate as a sidelink remote terminal. The terminal may determine whether a condition to operate as a sidelink relay terminal is satisfied or a condition to operate as a sidelink remote terminal is satisfied. The UE is camped on a frequency capable of transmitting the sidelink relay discovery message, but may determine whether the camped-on cell does not provide a sidelink relay discovery message transmission resource pool. When at least one of the above conditions is satisfied, the UE may start the RRC connection establishment procedure as shown in Table 5 below.

For NR sidelink relay, an RRC connection is initiated in the following case:
If configured by upper layers to transmit NR SL relay discovery message:
If the UE is acting as SL relay UE and if the SL relay UE threshold conditions are met; or
If the UE is selecting a SL relay UE / has a selected SL relay UE and if the SL remote UE threshold conditions are met:
If the frequency on which the UE is configured to transmit NR SL relay discovery message concerns the camped frequency and SIB_SL relay of the cell on which the UE camps does not include SL discovery TX pool

For NR sidelink relay, an RRC connection is initiated in the following case:
If configured by upper layers to transmit NR SL relay discovery message:
if the UE is acting as SL relay UE and if the SL relay UE threshold conditions are met; or
If the UE is selecting a SL relay UE / has a selected SL relay UE and if the SL remote UE threshold conditions are met:
If the frequency on which the UE is configured to transmit NR SL relay discovery message concerns the camped frequency and SIB_SL relay of the cell on which the UE camps does not include SL discovery TX pool

According to various embodiments, with respect to the NR sidelink relay, RRC connection is started in the following case.

When configured by upper layers to transmit the NR sidelink relay discovery message: When the UE operates as a sidelink relay UE and the sidelink relay UE threshold conditions are satisfied, or

If the UE is selecting a sidelink relay UE/with a sidelink relay UE selected, and the sidelink remote UE threshold conditions are satisfied:

The frequency set for the UE to transmit the NR sidelink relay discovery message is a camped frequency, and the SIB_SL relay (system information block message for sidelink relay purpose) of the cell in which the UE camps is a sidelink discovery message transmission pool. if not included

According to an embodiment of the present disclosure, when the terminal is a sidelink relay terminal or a sidelink remote terminal, the terminal provides configuration information (sidelink relay discovery message transmission resource configuration, sidelink) necessary for performing a sidelink relay discovery operation to the base station. In order to receive at least one of relay discovery message reception resource configuration, sidelink relay discovery message transmission gap configuration, and sidelink relay discovery message reception gap configuration), the terminal may transmit assistance information to the base station. The assistance information transmitted by the terminal to the base station may include at least one of the information listed in [Table 6] based on the following [Table 6].

SL relay UE or SL remote UE

To indicate SL relay discovery transmission resource request
To indicate it no longer requires SL relay discovery transmission resource
To indicate its interest in SL relay discovery reception
To indicate it no longer interested in SL relay discovery reception
To request gaps to monitor SL relay discovery
To request gaps to transmit SL relay discovery
To indicate it no longer requires SL discovery gaps (TX gap or RX gap)
Include ue-Type as relay UE or remote UE

To indicate SL relay discovery transmission resource request
Include SL discovery TX type set to true

To indicate its interest in SL relay discovery reception
Include SL discovery RX type set to true

SL relay UE or SL remote UE

To indicate SL relay discovery transmission resource request
To indicate it no longer requires SL relay discovery transmission resource
To indicate its interest in SL relay discovery reception
To indicate it no longer interested in SL relay discovery reception
To request gaps to monitor SL relay discovery
To request gaps to transmit SL relay discovery
To indicate it no longer requires SL discovery gaps (TX gap or RX gap)
Include ue-Type as relay UE or remote UE

To indicate SL relay discovery transmission resource request
Include SL discovery TX type set to true

To indicate its interest in SL relay discovery reception
Include SL discovery RX type set to true

According to various embodiments, in the sidelink relay UE or the sidelink remote UE, in order to indicate the sidelink relay discovery transmission resource request, to indicate that the sidelink relay discovery transmission resource is no longer needed, the sidelink relay To indicate interest in receiving discovery, to indicate that you are no longer interested in receiving sidelink relay discovery, to request gaps to monitor sidelink relay discovery, to request gaps for sending sidelink relay discovery To request, or to indicate that sidelink discovery gaps (transmission gap or reception gap) are no longer needed, the assistance information may include the UE type as relay UE or remote UE.

According to various embodiments, in a sidelink relay UE or a sidelink remote UE, in order to indicate a sidelink relay discovery transmission resource request, the help information may include a sidelink discovery transmission type set to true. According to various embodiments, in the sidelink relay UE or the sidelink remote UE, in order to indicate interest in sidelink relay discovery reception, the help information may include a sidelink discovery reception type set to true.

When the terminal is configured to provide the base station with help information for transmitting the sidelink relay discovery message, an embodiment of the operation of the terminal transmitting the help information for transmitting the sidelink relay discovery message to the base station is as follows [ Table 7].

If configured by upper layer to transmit NR SL relay discovery:
If the UE did not transmit a SUI (SidelinkUEInformation) since entering RRC_CONNECTED or
If since the last time the UE transmitted a SUI (SidelinkUEInformation) the UE connected to a Pcell not broadcasting SIB_SL relay (system information block for sidelink relay operation) or
If the last transmission of SUI (SidelinkUEInformation) did not include TX resource request for SL relay or if the information carried for SL relay TX resource request has changed since the last transmission of the SUI (SidelinkUEInformation) If the UE is acting as SL relay UE or If the UE is selecting a SL Relay UE / has a selected SL Relay UE and if the SL remote UE threshold conditions are met
Initiate transmission of SUI (SidelinkUEInformation) to indicate the SL relay discovery transmission resource request

Else
If the last transmission of the SUI (SidelinkUEInformation) included TX resource request for SL relay
Initiate transmission of SUI (SidelinkUEInformation) to indicate it no longer requires SL relay discovery transmission resource

다음은 단말이 릴레이 단말 또는 리모트 단말로서 동작할 수 있도록 인증된 경우, 서빙 셀에서 타겟 셀로의 핸드오버(handover)를 수행한 단말이 타겟 셀 기지국에게 사이드링크 릴레이 탐색 메시지 전송/수신을 위한 도움 정보를 전송할 수 있는 조건에 해당된다.

If SIB_SL relay (system information block for sidelink relay operation) is broadcast by the target Pcell and the UE transmitted a SUI (SidelinkUEInformation) indicating a change of NR SL relay discovery related parameters relevant in target Pcell (i.e., change of sidelink relay discovery RX interest, sidelink relay discovery TX resource request, sidelink relay discovery RX gap request, sidelink relay discovery TX gap request if gapRequestsAllowed is set to true (either dedicated or common)) during the last 1 sec preceding reception of RRCReconfiguration including mobility with synch

If configured by upper layer to transmit NR SL relay discovery:
If the UE did not transmit a SUI (SidelinkUEInformation) since entering RRC_CONNECTED or
If since the last time the UE transmitted a SUI (SidelinkUEInformation) the UE connected to a Pcell not broadcasting SIB_SL relay (system information block for sidelink relay operation) or
If the last transmission of SUI (SidelinkUEInformation) did not include TX resource request for SL relay or if the information carried for SL relay TX resource request has changed since the last transmission of the SUI (SidelinkUEInformation) If the UE is acting as SL relay UE or If the UE is selecting a SL Relay UE / has a selected SL Relay UE and if the SL remote UE threshold conditions are met
Initiate transmission of SUI (SidelinkUEInformation) to indicate the SL relay discovery transmission resource request

Else
If the last transmission of the SUI (SidelinkUEInformation) included TX resource request for SL relay
Initiate transmission of SUI (SidelinkUEInformation) to indicate it no longer requires SL relay discovery transmission resource

The following is help information for the terminal performing handover from the serving cell to the target cell to transmit/receive a sidelink relay discovery message to the target cell base station when the terminal is authenticated to operate as a relay terminal or a remote terminal It meets the conditions for transmission.

If SIB_SL relay (system information block for sidelink relay operation) is broadcast by the target Pcell and the UE transmitted a SUI (SidelinkUEInformation) indicating a change of NR SL relay discovery related parameters relevant in target Pcell (ie, change of sidelink relay discovery RX interest, sidelink relay discovery TX resource request, sidelink relay discovery RX gap request, sidelink relay discovery TX gap request if gapRequestsAllowed is set to true (either dedicated or common)) during the last 1 sec preceding reception of RRCReconfiguration including mobility with synch

In various embodiments, when configured to transmit NR sidelink relay discovery by an upper layer:

After the UE enters RRC_CONNECTED, SUI (SidelinkUEInformation) has not been transmitted, or the UE has not broadcast SIB_SL relay (system information block for sidelink relay operation) since the UE last transmitted SUI (SidelinkUEInformation). Either connected to the PCell, or the last transmission of SUI (SidelinkUEInformation) did not include a transmission resource request for sidelink relay, or the information delivered for a sidelink relay transmission resource request since the last transmission of SUI (SidelinkUEInformation) has changed, or , if the UE operates as a sidelink relay UE, or if the UE is a selected sidelink relay UE and the sidelink remote UE threshold condition is satisfied, the transmission of a SidelinkUEInformation (SUI) is initiated to indicate a sidelink relay discovery transmission resource request. .

if not:

If the last transmission of SUI (SidelinkUEInformation) includes a transmission resource request for sidelink relay, to indicate that the sidelink relay discovery transmission resource is no longer required, transmission of SUI (SidelinkUEInformation) starts.

If the SIB_SL relay (system information block for sidelink relay operation) is broadcast by the target Pcell, and during the last 1 second before reception of RRCReconfiguration including a handover indication to the target PCell, the UE is supported in the target Pcell. If it is determined that the SUI message including the change of the NR sidelink relay discovery information has started to be transmitted (when the UE starts transmitting the SUI message including the changed information while staying in the serving PCell), the UE transmits the SUI from the target Pcell base station. can start That is, the UE may have transmitted an SUI message to deliver sidelink relay discovery related information to the target Pcell base station through the serving Pcell base station before handover to the target Pcell base station. Change of sidelink relay discovery-related information near the time when gapRequestsAllowed is set to true (only or in common) of sidelink relay discovery receive interest, sidelink relay discovery transmission resource request, and sidelink relay discovery transmission gap request change) and starts to transmit “SidelinkUEInformation (SUI)” including the changed information, the corresponding information may not be transmitted from the serving Pcell base station to the target Pcell base station as sidelink relay discovery related information of the terminal. Accordingly, in order to deliver the latest information related to the sidelink relay discovery of the terminal to the target Pcell base station, the terminal may start transmitting the SUI message from the target Pcell base station when the above condition is satisfied.

Hereinafter, settings of transmission resource information and reception resource information of a sidelink relay discovery message according to an embodiment of the present disclosure will be described. In an embodiment, the transmission resource and the reception resource of the sidelink relay discovery message may be configured in the same transmission resource pool or the same reception resource pool as the transmission resource and reception resource defined for the purpose of a general sidelink message. In an embodiment, setting or releasing a transmission resource and/or a reception resource of the sidelink relay discovery message may mean setting up or releasing sl-PDSCH-Config. In one embodiment, the sl-PDSCH-Config may be as follows.

sl-PDSCH-Config is the period of the resource set in the sidelink relay discovery message in the corresponding transmission resource pool or the corresponding reception resource pool (that is, the number of slots in which the sidelink relay discovery message is transmitted in the corresponding transmission resource pool or the corresponding reception resource pool ( sl-Discovery-Period)), the number of PRBs set in the sidelink relay discovery message in the corresponding transmission resource pool or the corresponding reception resource pool (sl-RBResourcePDSCH), and a TX parameter to be applied to the sidelink relay discovery message (transmission power control) , modulation and coding scheme control). The transmission resource configuration information and reception resource configuration information (ie, sl-PDSCH-Config) of the sidelink relay discovery message may include configuration information of PSCCH and PSSCH corresponding to the sidelink relay discovery message. The configuration information of the PSCCH corresponding to the sidelink relay discovery message may be, for example, the same as or different from the configuration information of the PSCCH configured for the purpose of a general sidelink message. The configuration information of the PSSCH corresponding to the sidelink relay discovery message may be the same as or different from, for example, the configuration information of the PSSCH configured for the use of a general sidelink message.

According to an embodiment of the present disclosure, a TX parameter (transmission power control, MCS control) in sl-PSDCH-Config indicating transmission resource configuration and reception resource configuration of a sidelink relay discovery message, transmission of a sidelink relay discovery message and / or time resource (eg, number of slots, sl-Discovery-Period) for reception purpose, frequency resource (eg, number of PRBs, sl-RBResourcePDSCH) for transmission and / or reception of sidelink relay discovery message is set, and the rest Some may not be set. In this case, the terminal transmitting or receiving the sidelink relay discovery message may apply information applied to the PSCCH configuration or PSSCH configuration of the resource pool equally to the PSCCH or PSSCH corresponding to the transmission and/or reception of the sidelink relay discovery message. It can be judged that there is

If it is configured to measure RSRP for the sidelink relay discovery message, the terminal receiving the sidelink relay discovery message measures RSRP using the transmission and reception resource configuration information (sl-PDSCH-Config) of the sidelink relay discovery message can do. The UE uses the configuration information to select at least one of location information of a resource from which a sidelink relay discovery message is received, SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message, and PSSCH corresponding to a sidelink relay discovery message. information can be obtained. The UE performs RSRP measurement on at least one of SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message configured to measure the RSRP based on the acquired information and PSSCH corresponding to a sidelink relay discovery message. can do. According to an embodiment, the SCI (PSCCH, PSSCH) corresponding to the sidelink relay discovery message may include indication information indicating transmission of the sidelink relay discovery message so as to be distinguished from the general sidelink message transmission. According to another embodiment, the SCI (PSCCH, PSSCH) corresponding to the sidelink relay discovery message may not include indication information indicating transmission of the sidelink relay discovery message.

According to another embodiment of the present disclosure, the transmission resource and/or reception resource of the sidelink relay discovery message is in the same transmission resource pool or the same reception resource pool as the transmission resource and/or reception resource defined for the purpose of the general sidelink message. can be set. In this case, the configuration of the transmission resource and/or the reception resource of the sidelink relay discovery message may be defined by the sl-PSDCH-Config. In this case, a method in which a transmission resource and/or a reception resource of the sidelink relay discovery message is configured through sl-PDSCH-Config setup and/or release may be applied. The terminal may be configured to measure RSRP for the sidelink relay discovery message. In this case, the UE may determine whether a sidelink relay discovery message is present by using at least one of a source identifier, a destination identifier, and a sidelink logical channel identifier of a sidelink MAC PDU received from a resource of sl-PSDCH-Config. In an embodiment, when it is determined as a sidelink relay discovery message, the terminal determines at least one of SCI (PSCCH, PSSCH) corresponding to the sidelink relay discovery message and PSSCH corresponding to the sidelink relay discovery message can do. The UE may perform RSRP measurement on at least one of SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message configured to measure the RSRP and PSSCH corresponding to a sidelink relay discovery message.

According to another embodiment of the present disclosure, the transmission resource and/or reception resource of the sidelink relay discovery message is set in the same transmission resource pool or reception resource pool as the transmission resource and/or reception resource defined for the purpose of the general sidelink message. can be In this case, the configuration of the transmission resource and/or the reception resource of the sidelink relay discovery message may not be separately defined by the sl-PSDCH-Config. In this case, the transmission resource and/or reception resource of the sidelink relay discovery message is configured through at least one setup and/or release of the corresponding sl-PSCCH-Config and sl-PSSCH-Config. can be applied. The UE determines whether at least one of sl-PSCCH-Config and sl-PSSCH-Config corresponds to the transmission resource and/or reception resource of the sidelink relay discovery message, or whether it corresponds to the transmission resource and/or reception resource of the general sidelink message. It is necessary to distinguish This is to support a case in which the terminal is configured to measure RSRP for a sidelink relay discovery message. For example, sl-PSCCH-Config and sl-PSSCH-Config may be configured to include indication information of a transmission resource and/or a reception resource of a sidelink relay discovery message. For example, the transmitting terminal may transmit the sidelink relay discovery message by using the resources of sl-PSCCH-Config and sl-PSSCH-Config. In this case, sl-PSCCH-Config and sl-PSSCH-Config may include indication information indicating transmission of a sidelink relay discovery message so that the transmission of the sidelink relay discovery message can be distinguished from transmission of the general sidelink message. As an embodiment, the terminal receiving the sidelink relay discovery message performs RSRP based on the indication information of the sidelink relay discovery message transmission resource and/or reception resource configuration information (sl-PSCCH-Config, sl-PSSCH-Config). can be measured Based on the indication information, the UE receives at least one information of location information of a resource from which a sidelink relay discovery message is received, SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message, and PSSCH corresponding to a sidelink relay discovery message can be obtained. Based on the obtained information, the UE measures RSRP for at least one of SCI (PSCCH, PSSCH) corresponding to the sidelink relay discovery message configured to measure the RSRP and PSSCH corresponding to the sidelink relay discovery message. can be done

According to another embodiment, the configuration of the transmission resource and/or reception resource of the sidelink relay discovery message is not separately defined by the sl-PSDCH-Config, and the transmission resource and/or reception resource of the sidelink relay discovery message is the corresponding A method configured through setup and/or release of at least one of sl-PSCCH-Config and sl-PSSCH-Config may be applied. In this case, the transmitting terminal may transmit the sidelink relay discovery message by using the resources of sl-PSCCH-Config and sl-PSSCH-Config. Also, in this case, the SCI (PSCCH, PSSCH) may include indication information indicating transmission of the sidelink relay discovery message so that the transmission of the sidelink relay discovery message can be distinguished from transmission of the general sidelink message. The terminal receiving the sidelink relay discovery message is an SCI corresponding to the sidelink relay discovery message transmitted in the transmission resource and/or reception resource configuration information (sl-PSCCH-Config, sl-PSSCH-Config) of the sidelink relay discovery message. It can be determined from (PSCCH, PSSCH) that it is a sidelink relay discovery message. The UE may perform RSRP measurement on at least one of SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message configured to measure the RSRP and PSSCH corresponding to a sidelink relay discovery message.

According to another embodiment of the present disclosure, the transmission resource and/or reception resource of the sidelink relay discovery message is in the same transmission resource pool or the same reception resource pool as the transmission resource and/or reception resource defined for the purpose of the general sidelink message. can be set. In this case, the configuration of the transmission resource and/or the reception resource of the sidelink relay discovery message may not be separately defined by the sl-PSDCH-Config. In this case, the transmission resource and/or reception resource of the sidelink relay discovery message is configured through at least one setup and/or release of the corresponding sl-PSCCH-Config and sl-PSSCH-Config. can be applied. In one embodiment, the terminal may be configured to measure the RSRP for the sidelink relay discovery message. In this case, the terminal uses at least one of a source identifier, a destination identifier, and a sidelink logical channel identifier of a sidelink MAC PDU received from the resources of sl-PSCCH-Config and sl-PSSCH-Config to determine whether a sidelink relay discovery message can be judged In an embodiment, when it is determined as a sidelink relay discovery message, the terminal determines at least one of SCI (PSCCH, PSSCH) corresponding to the sidelink relay discovery message and PSSCH corresponding to the sidelink relay discovery message can do. The UE may perform RSRP measurement on at least one of SCI (PSCCH, PSSCH) corresponding to a sidelink relay discovery message configured to measure the RSRP and PSSCH corresponding to a sidelink relay discovery message.

The resource pool for transmitting the sidelink relay discovery message may be set to be the same as the transmission resource pool configured to transmit a general sidelink message (that is, set as a shared resource pool) or a transmission configured to transmit a general sidelink message It can be configured separately from the resource pool (ie set as a dedicated resource pool). With respect to the shared resource pool and/or the dedicated resource pool, a method for selecting a transmission resource pool is needed when the base station schedules the sidelink relay discovery message transmission resource and when the terminal directly selects the transmission resource.

As an embodiment, if a shared resource pool and a separate dedicated resource pool that are set to be the same as a transmission resource pool configured to transmit a general sidelink message in a resource pool for transmitting a sidelink relay discovery message are both set, the base station and the terminal are shared Regardless of the resource pool setting, the separately set resource pool (ie, dedicated resource pool) may be selected for transmitting the sidelink relay discovery message, and a transmission resource may be selected from the selected pool. When there is more than one dedicated resource pool set separately, the congestion level of each dedicated resource pool (eg, the congestion level according to CBR or channel busy ratio) is compared to select the pool with the least congestion degree or an arbitrary pool can be selected. .

As another embodiment, if both a shared resource pool and a separate dedicated resource pool, in which the resource pool for transmitting the sidelink relay discovery message is set to be the same as the transmission resource pool configured to transmit the general sidelink message, is set, the base station performs the sidelink relay When scheduling the discovery message transmission resource, the base station may randomly select one of the shared resource pool or the dedicated resource pool and allocate the transmission resource from the selected pool. Alternatively, the base station may select the pool with the smallest degree of congestion by comparing the congestion levels for the shared resource pool and the dedicated resource pool.

As another embodiment, if both a shared resource pool and a separate dedicated resource pool, in which the resource pool for transmitting the sidelink relay discovery message is set to be the same as the transmission resource pool configured to transmit the general sidelink message, is set, the UE directly sidelinks the When selecting a relay discovery message transmission resource, regardless of the shared resource pool setting, a dedicated resource pool may be selected for sidelink relay discovery message transmission and a transmission resource may be selected from the pool. If there is more than one dedicated resource pool, the pool with the least congestion level may be selected or an arbitrary pool may be selected by comparing the congestion level of each dedicated resource pool (ie, the level of congestion according to CBR or channel busy ratio).

As another embodiment, when the terminal directly selects the sidelink relay discovery message transmission resource, the congestion degree (ie, the congestion degree according to CBR or channel busy ratio) for the dedicated resource pool when the dedicated resource pool and the shared resource pool are set together If it is not greater than the threshold (eg, the congestion threshold) (it is assumed that there is no congestion in the case where the threshold is not greater than the threshold), the UE may select a dedicated resource pool and select a transmission resource from the pool. If it is determined that the congestion level for the dedicated resource pool is greater than the threshold, the UE may select a shared resource pool and select a transmission resource from the pool. In this case, if there is more than one dedicated resource pool, the terminal may compare the threshold with the dedicated resource pool having the smallest congestion value. This is to ensure that the dedicated resource pool is used in preference to the shared resource pool for the purpose of transmitting the sidelink relay discovery message. Alternatively, if the congestion degree is not greater than the threshold for the shared resource pool, the terminal may select the shared resource pool and select a transmission resource from the pool. If it is determined that the congestion level for the shared resource pool is greater than the threshold, the UE may select a dedicated resource pool and select a transmission resource from the pool. In this case, when there is more than one shared resource pool, the UE may compare the congestion level of the shared resource pool with the smallest congestion value with the threshold. This is to ensure that the shared resource pool is used in preference to the dedicated resource pool for the purpose of transmitting the sidelink relay discovery message. The threshold value for selecting the dedicated resource pool and the shared resource pool may be set in the terminal by the base station, or may be preset in the terminal.

As another embodiment, when the UE directly selects the sidelink relay discovery message transmission resource, when the dedicated resource pool and the shared resource pool are set together, the UE can compare the congestion level for the dedicated resource pool and the congestion level for the shared resource pool. have. As a result of the comparison, the UE may select a pool in which the congestion value is not large (it is assumed that the congestion value is not large as the congestion value is not large), and may select a resource from the pool. At this time, when there is more than one dedicated resource pool, the UE may select a pool having the smallest congestion value among the dedicated resource pools (assuming that the smaller the congestion value is, the less congested pool). When there is more than one shared resource pool, the UE may select a pool having the smallest congestion value among the shared resource pools (assuming that the smaller the congestion value is, the less congested pool).

As another embodiment, when the terminal directly selects the sidelink relay discovery message transmission resource, when the dedicated resource pool and the shared resource pool are set together, the terminal selects an arbitrary pool among the dedicated resource pool and the shared resource pool and selects a A transmission resource can be selected.

The base station may set mode 1 (ie, a mode in which the base station schedules transmission resources) or mode 2 (ie, a mode in which the terminal directly selects transmission resources) as the sidelink transmission resource allocation mode of the relay terminal. When set to mode 1, the base station relay terminal is a dynamic grant method, configured grant type 1 method (transmission resource scheduling information is transmitted by RRC signaling), configured grant type 2 method (transmission resource scheduling information is RRC signaling and DCI) transmission method) can be set to use at least one or a combination of them. The base station may set mode2 (the mode in which the terminal directly selects the transmission resource) or mode1 (the mode in which the base station schedules the transmission resource) as the sidelink transmission resource allocation mode of the remote terminal. When set to mode1, the base station can be configured to use the grant type 1 method configured by the remote terminal (a method in which transmission resource scheduling information is transmitted by RRC signaling). That is, the base station does not set the remote terminal to use the dynamic grant method or the configured grant type 2 method, which requires the operation of monitoring and decoding the DCI of the base station, and the remote terminal is relayed through the relay terminal. RRC signaling of the base station Through, it can be set to use the configured grant type 1 method that can obtain the scheduling information of the base station.

Methods according to the embodiments described in the claims or specifications of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.

Such programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: electrically erasable programmable read only memory), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs), or other types of It may be stored in an optical storage device, a magnetic cassette, or a memory composed of some or all of them. In addition, a plurality of each configuration memory may be included.

In addition, the program accesses through a communication network composed of a communication network such as the Internet, intranet, local area network (LAN), wide LAN (WLAN), or storage area network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is appropriately selected for the context presented for convenience of description, and the present disclosure is not limited to the singular or plural component, and even if the component is expressed in plural, it is composed of a singular or singular. Even an expressed component may be composed of a plurality of components.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

Claims (1)

A method for a terminal to transmit a sidelink relay discovery message in a wireless communication system, the method comprising:
determining a transmission condition for the sidelink relay discovery message;
checking the configuration of the base station related to the allocation of transmission resources for transmission of the sidelink relay discovery message in response to the satisfaction of the transmission condition;
receiving the transmission resource from the base station or selecting the transmission resource from a preset resource pool based on the setting of the base station; and
Transmitting a sidelink relay discovery message by using the allocated transmission resource or the selected transmission resource.

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