KR102493309B1 - Method and apparatus for configuration resource of synchronization signal and broadcast channel - Google Patents

Abstract

The present invention may provide a method for configuring a resource by a terminal in an NR V2X system. In this case, the resource configuration method may include receiving, by the terminal, resource configuration information for SL-SSB transmission from the base station, and transmitting the SL-SSB based on the received resource configuration information. In this case, resource configuration information for SL-SSB transmission may include frequency location information for SL-SBB and time location information for SL-SSB.

Description

Resource setting method and device for synchronization signal and broadcast channel for NR V2X system {METHOD AND APPARATUS FOR CONFIGURATION RESOURCE OF SYNCHRONIZATION SIGNAL AND BROADCAST CHANNEL}

The present invention relates to a method for configuring a sidelink-synchronization signal block (SL-SSB) transmission resource for a New Radio (NR) V2X (Vehicle To Everything) system.

The International Telecommunication Union (ITU) is developing IMT (International Mobile Telecommunication) frameworks and standards, and recently, discussions for 5G communication are underway through a program called "IMT for 2020 and beyond" .

In order to meet the requirements presented by "IMT for 2020 and beyond", the 3rd Generation Partnership Project (3GPP) NR (New Radio) system considers various scenarios, service requirements, potential system compatibility, etc. It is being discussed in the direction of supporting various numerologies on a resource unit basis.

In addition, V2X communication refers to a communication method that exchanges or shares information such as traffic conditions while communicating with road infrastructure and other vehicles while driving. V2X refers to V2V (vehicle-to-vehicle), which refers to LTE (Long Term Evolution)-based communication between vehicles, V2P (vehicle-to-pedestrian), which refers to LTE-based communication between a vehicle and a terminal carried by an individual, and vehicle and vehicle-to-infrastructure/network (V2I/N), which refers to LTE-based communication between roadside units/networks. Here, a roadside unit (RSU) may be a transportation infrastructure entity implemented by a base station or a fixed terminal. For example, it may be an entity that sends speed notifications to vehicles.

The present invention may provide a method for configuring SL-SSB transmission resources for the NR V2X system.

The present invention can provide a method for configuring SL-SSB transmission resources in terms of frequency domain.

The present invention can provide a method for configuring SL-SSB transmission resources in terms of time domain.

The present invention may provide a method of configuring SL-SSB transmission resources in consideration of a relationship with DL-SSB (Downlink-SSB).

The present invention may provide a method for configuring a resource by a terminal in an NR V2X system. In this case, the resource configuration method may include receiving, by the terminal, resource configuration information for SL-SSB transmission from the base station, and transmitting the SL-SSB based on the received resource configuration information. In this case, resource configuration information for SL-SSB transmission may include frequency location information for SL-SBB and time location information for SL-SSB.

According to the present disclosure, it is possible to provide a method for configuring SL-SSB transmission resources for the NR V2X system.

According to the present disclosure, it is possible to provide a method for configuring SL-SSB transmission resources from a frequency domain perspective.

According to the present disclosure, it is possible to provide a method for configuring SL-SSB transmission resources in terms of time domain.

According to the present disclosure, it is possible to provide a method for configuring SL-SSB transmission resources in consideration of a relationship with DL-SSB (Downlink-SSB).

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

1 is a diagram illustrating a frame structure for downlink/uplink transmission to which the present disclosure can be applied.
2 is a diagram showing resource grids and resource blocks to which the present disclosure can be applied.
3 is a diagram illustrating a synchronization signal transmission method according to an embodiment of the present invention.
4 is a diagram illustrating a system architecture according to an embodiment of the present invention.
5 is a diagram illustrating a scenario in which NR V2X sidelink communication is performed in a 3GPP network according to an embodiment of the present invention.
6 is a diagram illustrating BWP settings related to cell access of an NR Uu link according to an embodiment of the present invention.
7 is a diagram illustrating a relationship between a resource pool and a SLSS/PSBCH block according to an embodiment of the present invention.
8 is a diagram illustrating a method of indicating an NR side link resource pool and SL-SSB configuration using system information provided for each cell according to an embodiment of the present invention.
9 is a diagram illustrating an operation in an NR TDD band according to an embodiment of the present invention.
10 is a diagram illustrating a method of indicating a NR SL-SSB frequency position based on a start position of a transmission bandwidth according to an embodiment of the present invention.
11 is a diagram illustrating a method of indicating a NR SL-SSB frequency location based on an NR sidelink resource pool according to an embodiment of the present invention.
12 is a diagram illustrating a method of constructing and indicating an NR SL SSB burst set according to an embodiment of the present invention.
13 is a diagram illustrating a method of constructing and indicating an NR SL SSB burst set according to an embodiment of the present invention.
14 is a diagram illustrating a method of setting a start offset and an SL SSB burst window period based on a slot (or slot + OFDM symbol) unit according to an embodiment of the present invention.
15 is a diagram illustrating a method of setting a start offset and an SL SSB burst window period based on a slot (or slot + OFDM symbol) unit according to an embodiment of the present invention.
16 is a diagram illustrating an operation for additional signaling in consideration of TDD according to an embodiment of the present invention.
17 is a diagram illustrating operations for additional signaling in consideration of TDD according to an embodiment of the present invention.
18 is a diagram illustrating a case where an SL-SSB available in a “UL slot” or “UL slot + symbol” can be located according to an embodiment of the present invention.
19 is a diagram illustrating a floating sidelink SSB burst structure according to an embodiment of the present invention.
20 is a diagram illustrating a case in which a DL SSB burst window and a SL SSB burst window overlap according to an embodiment of the present invention.
21 is a flowchart illustrating a method of selecting SL-SSB resources according to an embodiment of the present invention.
22 is a diagram showing configurations of a base station device and a terminal device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily implement the present disclosure. However, this disclosure may be embodied in many different forms and is not limited to the embodiments set forth herein.

In describing the embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. And, in the drawings, parts irrelevant to the description of the present disclosure are omitted, and similar reference numerals are attached to similar parts.

In the present disclosure, when a component is said to be "connected", "coupled" or "connected" to another component, this is not only a direct connection relationship, but also an indirect connection relationship between which another component exists. may also be included. In addition, when a component "includes" or "has" another component, this means that it may further include another component without excluding other components unless otherwise stated. .

In the present disclosure, terms such as first and second are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements unless otherwise specified. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment. can also be called

In the present disclosure, components that are distinguished from each other are intended to clearly explain each characteristic, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form a single hardware or software unit, or a single component may be distributed to form a plurality of hardware or software units. Accordingly, even such integrated or distributed embodiments are included in the scope of the present disclosure, even if not mentioned separately.

In the present disclosure, components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment comprising a subset of elements described in one embodiment is also included in the scope of the present disclosure. In addition, embodiments including other components in addition to the components described in various embodiments are also included in the scope of the present disclosure.

In addition, this specification describes a wireless communication network, and the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that manages the wireless communication network, or Work can be done in a terminal coupled to the network.

That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. 'Base Station (BS)' may be replaced by terms such as a fixed station, Node B, eNode B (eNB), and access point (Access Point, AP). In addition, 'terminal' will be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), and non-AP STA. can

In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal through a corresponding channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

In the following description, the term NR system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from existing systems, but the scope of the present disclosure is not limited by this term. In addition, the term NR system in this specification is used as an example of a wireless communication system capable of supporting various subcarrier spacing (SCS), but the term NR system itself is used as a wireless communication system supporting a plurality of SCS. It is not limited.

1 is a diagram illustrating an NR frame structure and numerology according to an embodiment of the present invention.

일 수 있다. 이때,

이고,

일 수 있다. 또한,

는 NR 시간 단위와 LTE 시간 단위와의 배수 관계에 대한 상수일 수 있다. 참조 시간 단위로써 LTE에서는

,

및

가 정의될 수 있다.The basic unit of the time domain in NR is

can be At this time,

ego,

can be also,

May be a constant for a multiple relationship between the NR time unit and the LTE time unit. As a unit of reference time, in LTE

,

and

can be defined.

frame structure

를 가질 수 있다. 이때, 하나의 프레임은

시간에 해당하는 10개의 서브프레임으로 구성된다. 서브프레임마다 연속적인 OFDM 심볼의 수는

일 수 있다. 또한, 각 프레임은 2개의 하프 프레임(half frame)으로 나누어지며, 하프 프레임은 0~4 서브프레임과 5~9 서브프레임으로 구성될 수 있다. 이때, 하프 프레임 1 (half frame 1)은 0~4 서브 프레임으로 구성되고, 하프 프레임 2 (half frame 2)는 5~9 서브 프레임으로 구성될 수 있다.Referring to FIG. 1, the time structure of a frame for downlink and uplink (Downlink/Uplink, DL/UL) transmission is

can have At this time, one frame

It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols per subframe is

can be In addition, each frame is divided into two half frames, and the half frame may consist of 0 to 4 subframes and 5 to 9 subframes. In this case, half frame 1 may be composed of 0 to 4 subframes, and half frame 2 may be composed of 5 to 9 subframes.

At this time, the transmission timing of the uplink transmission frame i is determined based on Equation 1 below based on the downlink reception timing at the terminal.

은 듀플렉스 모드 (duplex mode) 차이 등으로 발생하는 TA 오프셋 (TA offset) 값일 수 있다. 기본적으로 FDD (Frequency Division Duplex)에서

은 0을 가지지만 TDD (Time Division Duplex)에서는 DL-UL 스위칭 시간에 대한 마진을 고려해서

고정된 값으로 정의될 수 있다.In Equation 1 below

may be a TA offset value generated by a duplex mode difference or the like. Basically in FDD (Frequency Division Duplex)

has 0, but in TDD (Time Division Duplex), considering the margin for DL-UL switching time

It can be defined as a fixed value.

[Equation 1]

2 is a diagram illustrating a resource grid and a resource block.

Referring to FIG. 2, resource elements in a resource grid may be indexed according to each subcarrier spacing. In this case, one resource grid may be generated for each antenna port and each subcarrier spacing. Uplink and downlink transmission and reception may be performed based on a corresponding resource grid.

)를 구성할 수 있다. 자원 블록에 대한 인덱스는 특정 주파수 대역 또는 시스템 대역폭 내에서 활용될 수 있다.One resource block is composed of 12 resource elements in the frequency domain, and an index for one resource block for every 12 resource elements as shown in Equation 2 below (

) can be configured. An index for a resource block may be utilized within a specific frequency band or system bandwidth.

[Equation 2]

Numerologies

Numerology can be configured in various ways to satisfy various services and requirements of the NR system. At this time, referring to Table 1 below, the numerology may be defined based on subcarrier spacing (SCS) used in an orthogonal frequency division multiplexing (OFDM) system, CP length, and the number of OFDM symbols per slot. . The above-described values may be provided to the UE through higher layer parameters DL-BWP-mu and DL-BWP-cp (DL) and UL-BWP-mu and UL-BWP-cp (UL).

가 2인 경우로서 서브캐리어 스페이싱이 60kHz인 경우에서 노말 CP 및 확장 CP(Extended CP)가 적용될 수 있으며, 다른 대역에서는 노말 CP만 적용될 수 있다.Also, as an example, in Table 1 below

When is 2 and subcarrier spacing is 60 kHz, normal CP and extended CP may be applied, and only normal CP may be applied in other bands.

[Table 1]

In this case, a normal slot may be defined as a basic time unit used to transmit basically one piece of data and control information in the NR system. The length of the normal slot may be basically composed of 14 OFDM symbols. In addition, unlike a slot, a subframe has an absolute time length corresponding to 1 ms in the NR system and can be used as a reference time for the length of another time interval. At this time, for coexistence or backward compatibility between LTE and NR systems, a time interval such as a subframe of LTE may be required in the NR standard.

For example, in LTE, data may be transmitted based on a transmission time interval (TTI), which is a unit time, and the TTI may be configured in units of one or more subframes. In this case, even in LTE, one subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).

Also, non-slots may be defined in NR. A non-slot may mean a slot having a number smaller than that of a normal slot by at least one symbol. For example, when low latency is provided, such as URLLC (Ultra-Reliable and Low Latency Communications) service, latency can be reduced through nonslots having a smaller number of symbols than normal slots. In this case, the number of OFDM symbols included in the nonslot may be determined in consideration of a frequency range. For example, in a frequency range of 6 GHz or higher, a nonslot having a length of 1 OFDM symbol may be considered. As another example, the number of OFDM symbols defining nonslots may include at least two OFDM symbols. In this case, the range of the number of OFDM symbols included in the nonslot may be configured as the length of the minislot up to the normal slot length -1. However, as a non-slot standard, the number of OFDM symbols may be limited to 2, 4, or 7 symbols, but is not limited to the above-described embodiment.

가 1 및 2에 해당하는 서브캐리어 스페이싱이 사용되고, 6GHz 초과의 비면허 대역에서는

가 3 및 4에 해당하는 서브캐리어 스페이싱이 사용될 수 있다. 이때, 일 예로,

가 4인 경우는 후술할 SSB(Synchronization Siganl Block) 전용으로만 사용될 수 있으며, 상술한 실시예로 한정되지 않는다.Also, for example, in an unlicensed band of 6 GHz or less

Subcarrier spacing corresponding to 1 and 2 is used, and in unlicensed bands above 6 GHz

A subcarrier spacing corresponding to 3 and 4 may be used. In this case, for example,

When is 4, it can be used exclusively for a synchronization signal block (SSB), which will be described later, and is not limited to the above-described embodiment.

슬롯 당 OFDM 심볼의 수

를 나타낸다. 표 2는 표 1에서 제공하는 바와 같이 각 서브캐리어 스페이싱 값에 따른 슬롯 당 OFDM 심볼의 수, 프레임 당 슬롯의 수 및 서브프레임 당 슬롯의 수를 나타낸다. 이때, 표 2에서는 14개의 OFDM 심볼을 갖는 노멀슬롯을 기준으로 상술한 값들을 나타낸다.In addition, Table 2 is for each subcarrier spacing setting in the case of a normal CP.

Number of OFDM symbols per slot

indicates Table 2 shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to each subcarrier spacing value as provided in Table 1. In this case, Table 2 shows the above-described values based on a normal slot having 14 OFDM symbols.

[Table 2]

가 2인 경우로서 서브캐리어 스페이싱이 60kHz일 때 확장 CP가 적용될 수 있다. 표 3은 확장 CP인 경우로서

슬랏 당 OFDM 심볼의 수

는 12인 노말슬롯을 기준으로 각각의 값을 나타낼 수 있다. 이때, 표 3을 참조하면, 60kHz 서브케리어 스페이싱을 따르는 확장 CP인 경우, 슬랏 당 심볼의 수, 프레임 당 슬롯의 수 및 서브프레임당 슬롯의 수를 나타낼 수 있다.Also, as mentioned above,

When is 2 and the subcarrier spacing is 60 kHz, the extended CP may be applied. Table 3 shows the case of an extended CP.

Number of OFDM symbols per slot

may represent each value based on 12 normal slots. In this case, referring to Table 3, in the case of an extended CP following 60 kHz subcarrier spacing, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe may be indicated.

[Table 3]

Next, the structure of SSB/PBCH (Physical Broadcast Channel) in the NR system and the initial cell access procedure in the NR system will be described.

In this case, the NR base station (i.e. gNB) may periodically transmit the signals and channels shown in Table 4 to the terminals in order to allow initial cell selection of the terminals (i.e. UEs) in the cell.

[Table 4]

For example, the SS/PBCH block may be the aforementioned SSB. At this time, even in the NR system, in order for the terminal to perform the initial wireless access, it may be necessary to receive a synchronization signal transmitted from the corresponding wireless access system and a broadcast channel carrying important system information. To this end, the terminal may check reception sensitivity of a synchronization signal in order to find an optimal cell in the best channel environment. The terminal may perform frequency/time synchronization and cell identification operations for initial access to an optimal channel among one or more channels within a specific frequency band operated based on the checked reception sensitivity. The terminal can check the boundary of OFDM symbol timing through the above-described operation, and then start PBCH decoding within the same SSB.

At this time, the terminal may perform PBCH decoding by receiving a PBCH Demodulation Reference Signal (DMRS). In addition, the UE can acquire 2 or 3 LSB bit information of SSB index information bits through PBCH DMRS. Thereafter, the UE may obtain information included in the PBCH payload by performing PBCH decoding. After that, the terminal may perform a decoding procedure of SIB 1 using information acquired through the PBCH.

For example, in an NR system, a UE may receive Remaining System Information (RMSI) as system information not transmitted on a PBCH through a broadcast signal or channel. In addition, the terminal may receive Other System Information (OSI) and Paging Channel as other additional system information through a broadcast signal or channel.

Thereafter, the terminal may perform access to the base station through a random access channel (RACH) procedure, and then perform mobility management.

Also, as an example, when the terminal receives the SSB, there is a need to set an SSB composition and an SS burst set composition.

NR V2X service

Regarding V2X services, existing V2X services (e.g. LTE Rel-14 V2X) could support a set of basic requirements for V2X services. At this time, the requirements were basically designed with sufficient consideration of the road safety service. Therefore, V2X User Equipment (UEs) can exchange self-state information through Sidelink, and can exchange the above-mentioned information with infrastructure nodes and/or pedestrians. have been able to

On the other hand, in a more advanced service (e.g. LTE Rel-15) as a V2X service, carrier aggregation in the sidelink, high order modulation, latency reduction, transmit diversity (Tx diversity and feasibility of sTTI, new features were introduced. Based on the above, coexistence (same resource pool) with V2X UEs was required, and the above-described services were provided based on LTE.

For example, technical characteristics can be classified based on four categories as shown in Table 5 below, considering use cases for supporting a new V2X service as SA (System Aspect) 1. In this case, in Table 5 below, vehicle platooning may be a technology in which a plurality of vehicles dynamically form a group and operate similarly. In addition, extended sensors may be technologies for collecting and exchanging data obtained from sensors or video images. In addition, advanced driving may be a technology in which a vehicle is driven based on full automation or semi-automation. In addition, remote driving may be a technology for providing a technology and an application for remote control of a vehicle, and more specific details of the above may be shown in Table 5 below.

[Table 5]

In addition, SA1 described above may be considered as both LTE and NR as an eV2X (enhanced V2X) support technology for supporting a new V2X service. For example, the NR V2X system may be a first V2X system. In addition, the LTE V2X system may be a second V2X system. That is, the NR V2X system and the LTE V2X system may be different V2X systems. In the following, related content will be described based on a method for satisfying low delay and high reliability required in the NR sidelink based on the NR V2X system. However, the same or similar configuration may be extended and applied to the LTE V2X system, and is not limited to the following embodiment. That is, it can be applied to the interoperable part in the LTE V2X system, and is not limited to the following embodiment. At this time, as an example, NR V2X capability may not necessarily be limited to support only V2X services, and which V2X RaT to use may be selected.

3 is a diagram illustrating a sidelink synchronization information transmission method.

Referring to FIG. 3 , sidelink synchronization information may be transmitted. At this time, as an example, FIG. 3 (a) may be a method of transmitting synchronization information of the first V2X system (or LTE V2X system). In addition, FIG. 3 (b) may be a method of transmitting synchronization information of the second V2X system (or NR V2X system).

Referring to FIG. 3(a), signaling for transmission of synchronization information of an LTE sidelink for V2X may consider a case of In Coverage (IC) or In Partial Coverage. In this case, the following will be described based on the case of IC, and the same can be applied to the case of partial in-coverage, and is not limited to the above-described embodiment.

In addition, signaling for transmission of synchronization information of the LTE sidelink may consider the case of Out of Coverage (OOC). At this time, as an example, in the case of IC, the terminal 301 may receive configuration information for synchronization signal transmission from the base station 302 (EUTRAN) through a System Information Block (SIB) 18 and/or SIB 21. Also, as an example, when the terminal 303 is in an RRC Connected state, configuration information for transmitting a synchronization signal may be transmitted through an RRC connection message. At this time, the terminal may transmit synchronization information to other terminals through SLSS & Master Information Block-SL and / or Master Information Block-SL-V2X based on the setting information. Through this, sidelink synchronization information can be transmitted.

On the other hand, in the case of OOC, the terminal 303 may provide synchronization information to another terminal 304 by including synchronization information in SLSS & Master Information Block-SL and / or Master Information Block-SL-V2X, It is not limited to the examples.

In addition, as an example, referring to FIG. 3 (b), in the case of IC, the terminal 305 as a second V2X system (NR V2X system) is a synchronization signal through OSI (Other System Information) from the base station 306 (NR) It is possible to obtain setting information for transmission. Also, as an example, when the terminal 305 is in an RRC connected state, configuration information for transmitting a synchronization signal may be transmitted through an RRC connected message. At this time, the terminal 305 may include synchronization information in the NR SLSS and/or NR V2X MIB through the sidelink and transmit it to other terminals.

Meanwhile, in the case of OOC, the terminal 307 may provide synchronization information to another terminal 308 by including the synchronization information in the NR SLSS and/or NR V2X MIB, and is not limited to the above-described embodiment.

In addition, as an example, in the case of IC similar to FIG. 3 (a) in the second V2X system (NR V2X system), the terminal 309 transmits the synchronization signal from the base station 310 (EUTRAN) through SIB 21. can receive Also, as an example, when the terminal 309 is in an RRC Connected state, configuration information for transmitting a synchronization signal may be transmitted through an RRC connection message. At this time, the terminal may transmit synchronization information to other terminals through the Master Information Block-SL-V2X based on the setting information. Through this, sidelink synchronization information can be transmitted.

On the other hand, in the case of OOC even in the second V2X system (NR V2X system), the terminal 311 may provide synchronization information to another terminal 312 by including synchronization information in the NR SLSS and / or NR V2X MIB, It is not limited to one embodiment.

That is, in the case of IC, the V2X terminal provides information for sidelink synchronization (SL synchronization) transmission from the network based on the LTE / NR Uu link (link between the eNB or gNB and the terminal) as described above in advance. Settings can be provided based on In this case, as described above, methods for transmitting synchronization information on the sidelink include network signaling-based transmission and terminal-based transmission. At this time, the terminal may perform NR SL-SSB transmission based on receiving system configuration information for transmitting a synchronization signal and V2X-MIB from the LTE and / or NR base station. At this time, if the terminal is connected to the LTE cell and / or NR cell in RRC connection mode, system configuration information is provided to the terminal through an RRC reconfiguration message, and the terminal can perform NR SL-SSB transmission based on the information .

Meanwhile, in the case of terminal-based transmission, in the case of IC, the terminal may be provided through a broadcasting signal (e.g: system information) of the base station. Alternatively, in the case of OOC, whether or not to transmit synchronization information may be determined based on a preset threshold value, and is not limited to the above-described embodiment.

Synchronization information transmitted by the terminal based on the above can be obtained based on the signal and information received from the base station by the IC. Also, as an example, synchronization information transmitted by a terminal may be obtained from another sidelink transmitting terminal. Also, as an example, the synchronization information transmitted by the terminal may be derived based on the signal and information received from the GNSS.

In the following, a terminal generating synchronization information by itself and transmitting the synchronization information is referred to as a synchronization reference terminal (ie, SyncRef UE). That is, the terminal can generate synchronization information on its own based on the acquired information and transmit it to other terminals, as described above. At this time, for example, in the case of OOC, NR-SSB transmission may be performed based on SLSS and MIB information provided from the synchronization reference terminal, which may be to provide prior information for transmitting synchronization information to the terminal.

In the following, a synchronization signal transmission method and synchronization procedure will be described based on the foregoing. At this time, as an example, the NR sidelink frequency may consider FR1, which is a frequency of 6 GHz or less, and FR2 (i.e. up to 52.6 GHz), which is a frequency exceeding 6 GHz. Also, as an example, NR sidelink frequencies may consider both unlicensed ITS bands and licensed bands. That is, as described above, a common design method for supporting each frequency band may be required. To this end, NR sidelink design considering the NR system may be required. As an example, even if it is an omni-directional Tx/Rx that is not actually beam-based, as in the NR standard design, an NR sidelink design that can basically support beam-based transmission and reception may be required, and is not limited to the above. . In addition, Table 6 below may be each term applied in the following invention, but is not limited to the above-described embodiment.

[Table 6]

NR side link design

The following describes an NR V2X sidelink design method that satisfies the requirements for the above-described advanced V2X (i.e. eV2X) services.

More specifically, a synchronization procedure and method required for forming a radio link for an NR sidelink will be described in detail. As an example, as described above, in the NR sidelink design, FR1 and FR2 (i.e. up to 52.6 GHz) and unlicensed ITS bands and licensed bands ITS as NR sidelink frequencies are frequency bands in which the NR system operates and ranges can all be considered. In addition, as an example, the availability of the LTE (NG-eNB) / NR Uu link, which is the 3GPP NG-RAN network of Table 6 described above, may be considered in the NR sidelink design.

In addition, as an example, a design for transmitting eV2X synchronization information and transmitting and receiving signals may be considered to satisfy higher requirements from the above-described advanced V2X services. At this time, the frequency for NR V2X sidelink communication may further consider at least one or more of the factors shown in Table 7 below based on technologies required in the new system to be different from the existing system (e.g. LTE). That is, as shown in Table 7 below, there is a need to satisfy new V2X service requirements by applying NR V2X side link based on NR radio access technology, particularly uplink transmission related technologies.

In addition, other factors may be considered in consideration of the new system as well as Table 7 below, and are not limited to the above-described embodiment.

[Table 7]

In addition, as an example, physical channels, signals, basic slot structures, and physical resources of NR V2X sidelinks may be shown in Table 8 below.

[Table 8]

NR Time Division Duplex (TDD) structure

For example, the UE may operate based on the NR TDD structure. At this time, when only "TDD UL-DL configurationCommon" is provided to the UE through the upper layer, the UE can check slot configuration information based on the following parameters in "TDD UL-DL configurationCommon".

More specifically, the "Reference subcarrier spacing" parameter in "TDD UL-DL configurationCommon" may be a reference SCS value for TDD UL-DL configuration. At this time, it may be set independently of the SCS value for actual data transmission. In addition, the reference SCS value may be set to be no larger than the SCS value of the BWP set in one serving cell. For example, if BWP1 = 30 kHz SCS and BWP2 = 60 kHz SCS among the BWPs configured for one serving cell, the reference SCS value may be at least 15 kHz SCS or 30 kHz SCS value. That is, as described above, the reference SCS value may be set to be no larger than the SCS value of the BWP set in one serving cell.

) msec" 파라미터는 하나의 슬롯 설정이 적용되는 시간 구간을 의미할 수 있다. 이때, 일 예로, DL/FL/UL 비율을 결정하는 파라미터들은 모두 P msec 내의 슬롯/심볼(slot/symbol)들 단위로 슬롯을 설정할 수 있다.In addition, as an example, "Slot configuration period (

) msec" parameter may mean a time interval to which one slot configuration is applied. In this case, as an example, parameters determining the DL/FL/UL ratio are all slot/symbol units within P msec slots can be set with

Also, as an example, the "A number of slots with only DL symbols" parameter in "TDD UL-DL configurationCommon" may indicate the number of slots having only DL symbols within a P msec time interval.

msec 시간 구간 내에 DL 심볼 수를 지시할 수 있다. Also, as an example, the "A number of DL symbols" parameter in "TDD UL-DL configurationCommon"

The number of DL symbols may be indicated within the msec time interval.

Also, as an example, the "A number of slots with only UL symbols" parameter in "TDD UL-DL configurationCommon" may indicate the number of slots having only UL symbols within a P msec time interval.

msec 시간 구간 내에 UL 심볼 수를 지시할 수 있다. Also, as an example, the "A number of UL symbols" parameter in "TDD UL-DL configurationCommon"

The number of UL symbols may be indicated within the msec time interval.

) 내에 DL/FL/UL의 비율을 설정할 수 있다. 또한, 일 예로,

는 2개 프레임마다 동일한 수를 가지고 존재할 수 있다. 또한, 일 예로, 상술한 TDD UL-DL 설정을 위한 참조 SCS는 하기의 SL-SSB를 위한 SCS 및 사이드링크 V2X 통신 채널을 위한 SCS보다는 작거나 동일할 수 있으며, 이에 대해서는 후술한다.At this time, the terminal configures a slot configuration period to which one TDD UL-DL configuration is applied through the above information.

), the ratio of DL/FL/UL can be set. Also, for example,

may exist with the same number every two frames. In addition, as an example, the reference SCS for the above-described TDD UL-DL configuration may be smaller than or equal to the SCS for the SL-SSB and the SCS for the sidelink V2X communication channel, which will be described later.

Also, as an example, FIG. 4 may be a basic network architecture configuration considering NR V2X sidelink.

As an example, referring to FIG. 4, 5GC (5G Core NW) nodes 410-1 and 410-2 and NG-RAN nodes 420-1, 420-2, 430-1 and 430-2 An NG interface may be established between them. Also, an Xn interface may be configured between the NG-RAN nodes 420-1, 420-2, 430-1, and 430-2. At this time, gNB (NR UP / CP protocol, 420-1, 420-2) and NG-eNB (E-UTRA UP / CP protocol, 430-1, 430-2) constituting NG-RAN in the above architecture Centrally, the corresponding nodes can be interconnected through the Xn interface. Also, as described above, it may be connected to 5GC through the NG interface. In this case, as an example, in the above-described architecture, both the LTE sidelink terminal and the NR sidelink terminal can be controlled by the NG-RAN (i.e. LTE Uu and NR Uu) based on the gNB and the NG-eNB. Therefore, when the NR sidelink terminal transmits synchronization information, it receives synchronization information from the LTE Uu or NR Uu link and transmits NR sidelink synchronization information (e.g. SL Synchronization Signal / SL Physical broadcast Channel) based on the information, It is not limited to the above-described embodiment. That is, the NR sidelink terminal can acquire synchronization information not only through the NR Uu link but also through the LTE Uu link.

Meanwhile, in relation to V2X side link communication, V2X side link terminals may perform V2X side link communication. However, in order for V2X sidelink terminals to start communication, certain conditions need to be satisfied, and the conditions for this may be as shown in Table 9 below. That is, the V2X sidelink terminal may perform V2X sidelink communication in an RRC idle state, inactive state, or connected mode. In addition, V2X sidelink terminals performing V2X sidelink communication need to be registered in a cell selected on a used frequency or belong to the same PLMN. In addition, when a V2X sidelink terminal is OOC on a frequency for V2X sidelink communication, V2X sidelink communication can be performed only when V2X sidelink communication can be performed based on pre-configuration information. .

[Table 9]

At this time, as described above, sidelink synchronization information may be required to start V2X sidelink communication. Therefore, the UE needs to transmit sidelink synchronization information. However, the transmitting terminal (Sidelink Tx UE) may receive configuration for sidelink synchronization information transmission before transmitting the corresponding synchronization information. At this time, as an example, the transmitting terminal may receive configuration for sidelink synchronization information transmission based on a system information message or an RRC reset message (in the case of an RRC CONNECTED UE) broadcast from the above-described NG-RAN nodes. Also, as an example, if the NR V2X sidelink terminal (hereinafter referred to as a terminal) does not exist in the NG-RAN network, sidelink synchronization information may be transmitted based on previously set information, as described above.

Also, based on the foregoing, the terminal may determine a source for synchronization reference. At this time, the terminal may first need to determine a resource corresponding to a slot or time domain in which a sidelink SSID (SLSSID) and a sidelink synchronization signal block (NR SL SSB) are transmitted. Also, as an example, the terminal may select a numerology (e.g. SCS) to be used. In this case, as an example, parameters of the above-described numerology may be set through control of the base station. In addition, as an example, one numerology may be arbitrarily determined in advance according to a frequency used by V2X sidelink communication, and is not limited to the above-described embodiment. Also, as an example, the terminal may determine other additional information before determining the source for synchronization reference, and is not limited to the above-described embodiment.

Meanwhile, FIG. 5 may be an example of a scenario in which NR V2X sidelink communication is performed in a 3GPP network based on the above. At this time, NR V2X sidelink communication may be performed on a 3GPP network (hereinafter referred to as NG-RAN), and additionally, the existence of a GNSS signal may be considered.

More specifically, referring to FIG. 5, each of the NR V2X sidelink terminals may be IC or OOC based on the NG-eNB 510. In addition, it may be IC or OOC based on gNB 520. Also, it may be IC or OOC based on GNSS 530. At this time, considering the above-described situation, NR V2X sidelink terminals may select a source of synchronization reference based on the location and capability of the terminal, which will be described later. Also, as an example, in addition to the scenario shown in FIG. 5, scenarios shown in Table 10 below may be considered, and are not limited to the above-described embodiment.

[Table 10]

Embodiment (NR SL-SSB physical resource location designation method)

As an NR SL-SSB physical resource location designation method, the NR SL-SSB resource location may be indicated from a frequency domain perspective. Also, as an example, the NR SL-SSB resource location may be indicated in the time domain as a method for specifying the location of the NR SL-SSB physical resource. As another example, the NR SL-SSB physical resource location may be indicated through additional signaling in addition to the above-described indication information in the frequency domain and time domain, and is not limited to the above-described embodiment.

Example 1 (from a frequency domain perspective)

Unlike the LTE sidelink, the NR sidelink can be operated in ultra-wideband. At this time, as an example, in the LTE sidelink, the SLSS/PSBCH could be transmitted in a plurality of physical resource blocks (PRBs) in the middle of an uplink carrier (UL carrier). However, as described above, SLSS/PSBCH may not be transmitted only in a specific frequency position of one frequency (or carrier) according to the characteristics of the ultra-wideband NR band. That is, within one uplink carrier (or frequency), one or more sidelink BWPs (Sidelink Bandwidth Part, hereinafter SL BWPs) may be configured in the form of a resource pool for NR sidelink communication. In this case, as an example, NR SL-SSB may be transmitted in response to one or a plurality of SL BWPs.

More specifically, FIG. 6 below is a diagram illustrating BWP settings related to cell access of an NR Uu link. Referring to FIG. 6, an NR carrier may have at least one cell-defining SSB (C-SSB). For example, SSB 1 and SSB3 in FIG. 6 may be C-SSB. In this case, each C-SSB may be associated with Remaining System Information (RMSI) (i.e. SIB1). The RMSI may include signals and information essential to be provided by the NR base station in configuring one cell. In addition, the C-SSB may always be located on a sync raster. Also, for example, in the RRC CONNECTED mode, additional SSBs may be configured based on the purpose of measurement. At this time, as an example, initial access terminals may select and receive an optimal C-SSB through synchronization raster search within a specific NR band. At this time, by decoding the RMSI associated with the received C-SSB, initial cell access may be performed starting with a random access procedure thereafter. For example, UE 1 (UE 1, 610) and UE 2 (UE 2, 620) receive SSB 1, decode RMSI associated with SSB 1, and perform initial cell access based on a random access procedure. Also, as an example, UE 3 (UE 3, 630) may receive SSB 2, decode RMSI associated with SSB 2, and perform initial cell access based on a random access procedure. That is, within one carrier, gNB cell configuration may be possible using the same or different Cell IDs. In addition, frequency utilization using BWP may be possible on one carrier.

Also, as an example, system information (e.g. SIB21 in case of LTE V2X) may be provided from a cell in performing NR V2X sidelink communication. At this time, in NR, system information may be provided through a sidelink-other system information (SL-OSI) channel. However, as an example, system information is not limited to the SL-OSI channel and may be delivered through NR PSBCH or RMSI according to a signaling method. In the following, for convenience of explanation, the description is based on S-OSI, but it may be obvious that the same can be applied to NR PSBCH or RMSI.

At this time, as an example, information on basic resource pool information settings for NR V2X communication and settings for transmission of synchronization information may be provided in the SL-OSI information. In addition, other setting information for NR V2X communication may be provided, and is not limited to the above-described embodiment.

At this time, as an example, configuration information for synchronization information transmission described below may be provided to all idle/inactive/connected mode terminals through SL-OSI provided in one cell. For example, terminals that have not been provided with corresponding system information may be provided with the above-described configuration information regarding transmission of synchronization information in pre-configuration information, and are not limited to the above-described embodiment.

Meanwhile, as an example, FIG. 7 is a diagram illustrating a relationship between a resource pool and a SLSS/PSBCH block. Referring to FIG. 7, a SLSS/PSBCH block may be associated with a resource pool. For example, one resource pool or resource pool list may be associated with an SLSS/PSBCH block providing one or more SLSSID values. For example, when one resource pool is associated with one SLSS/PSBCH block having an SLSSID value, the corresponding SLSS/PSBCH block may exist in the corresponding resource pool. As another example, one resource pool may be associated with a plurality of SLSS/PSBCH blocks having SLSSID values. In this case, a plurality of SLSS/PSBCH blocks may exist in a corresponding resource pool, and is not limited to the above-described embodiment.

In this case, as an example, FIG. 8 is a diagram illustrating a method of indicating an NR side link resource pool and SL-SSB setting using system information (e.g. SL-OSI) provided for each cell. In this case, FIG. 8 is a diagram showing a case where a SUL (Supplementary Uplink) band exists in NR FDD (Frequency Division Duplex). In this case, the SUL may mean a DL carrier capable of configuring one serving cell or an extra UL carrier capable of being additionally set to a DL/UL carrier.

For example, the base station may provide V2X synchronization information setting and resource pool setting in the corresponding cell through system information (e.g. RMSI or OSI). At this time, the terminal may receive the C-SSB on the DL carrier to obtain the above-described system information. The terminal may receive the configuration information for the above-described V2X communication from the selected serving cell through system information.

More specifically, referring to FIG. 8 , a first terminal (UE 1, 810) and a second terminal (UE 2, 820) are terminals camping on Cell ID=5 and receiving OSI information. can On the other hand, the third terminal (UE 3, 830) may be a terminal that receives other OSI information by camping on Cell ID=6. That is, the first terminal 810 / the second terminal 820 and the third terminal 830 can be regarded as camping in different cells, and can be regarded as the case of different cells. At this time, each cell is scrambled with SI-RNTI on “Type0 CORESET” in a different initial downlink BWP (initial DL BWP) and transmits SIB1 (i.e. RMSI) may be provided to UEs in each cell.

Terminals within the cell that have received the corresponding SIB1 can acquire “OSI CORESET” information and scheduling information for receiving OSI information, and can receive OSI based on the indicated OSI scheduling information.

At this time, in FIG. 8, terminals that have obtained independent OSI information for each cell may be provided with cell-specific RRC parameters for NR V2X communication. For example, in Cell ID=5, the OSI may provide resource pool information associated with the frequency location of the first SL-SSB 840 . Also, as an example, the OSI corresponding to Cell ID=6 may provide resource pool information related to the frequency location of the second SL-SSBs 850-1 and 850-2.

That is, in the above-described barcharim NR V2X sidelink communication, the location where the SL-SSB can be transmitted and received is not determined in advance and can be flexibly changed according to the resource pool setting associated with the frequency band. There is a need to provide information. That is, in NR V2X sidelink communication, the location where SL-SSB can be transmitted and received can be set differently according to the setting of the operator providing the V2X sidelink communication service, and thus the corresponding location information needs to be provided to terminals. Accordingly, the OSI information may provide at least one NR SL-SSB frequency location and resource pool list information associated with the corresponding NR SL-SSB as parameters for NR V2X communication.

Also, as an example, NR Time Division Duplex (TDD) may be considered. At this time, for example, in NR TDD, DL and UL may operate while having the same BWP index. That is, the same BWP setting can be applied to DL and UP. At this time, FIG. 9 is a diagram showing an operation in the NR TDD band in consideration of the above. Referring to FIG. 9, it may be similar to FIG. 8, but since the DL and UL operate with the same BWP index, SL-SSBs may correspond to one resource pool, and the operation of providing information is shown in FIG. 8 can be similar to

Example 1-1 (when NR base station provides location of NR SL-SSB physical resource to NR V2X terminal)

Based on the above, the NR base station may provide the location of the NR SL-SSB physical resource to the NR V2X terminal. In this case, as an example, the NR SL-SSB frequency information provided by the base station may be a carrier mainly corresponding to FDD or SUL. In this case, a detailed frequency location indicating method will be described below. As an example, the information on synchronization information transmission settings for NR SL-SSB transmission information may include transmission of one or a plurality of NR SL-SSBs within a UL carrier, and is not limited to the above-described embodiment.

Embodiment 1-1-1 (using NR base station signaling information)

For example, when the NR V2X terminal initially accesses the NR base station, the NR V2X terminal may receive system information from the NR base station. At this time, the system information may include setting information for synchronization. In the following, a specific method for indicating the frequency location of the NR SL-SSB will be described.

Embodiment 1-1-1-1 (NR SL-SSB frequency position indication through “ARFCN-ValueNR” or “GSCN”)

For example, the NR base station may indicate the NR SL-SSB frequency location through “ARFCN-ValueNR” or “GSCN”.

In this case, the “ARFCN-ValueNR” value may be a value corresponding to a channel raster within the entire band defined by NR. Accordingly, the location of a specific channel raster within a specific band can be indicated if the corresponding value is known. At this time, the position of the frequency indicated by the “ARFCN-ValueNR” value is determined by the smallest subcarrier index of the central PRB of the NR SL-SSB (e.g. subcarrier #0 of RB#10 of NR-SL SSB (NR-SL When the total number of SSB PRBs is 20)), it can be determined. Also, as an example, the frequency location may be determined as the lowest subcarrier index (Subcarrier#0 of the PRB#0) of the lowest PRB index (PRB#0 of NR SL SSB) to which the NR SL-SSB is allocated. As another example, another subcarrier index of another PRB to which the NR SL-SSB is allocated may be used, and is not limited to the above-described embodiment.

In addition, the NR base station may indicate the NR SL-SSB frequency location through a “Global Synchronization Channel Number (GSCN)” value. At this time, since the GSCN value instructed by the UE is assigned one-to-one to a specific sync raster position of a specific band, the NR SL-SSB frequency position can be indicated through the value. Like the “ARFCN” value, the indicated frequency location is the smallest subcarrier index of the center PRB of the NR SL-SSB (e.g. subcarrier #0 of RB#10 of NR-SL SSB (when the total number of PRBs in the NR-SL SSB is 20)) ) can be determined. Also, as an example, the frequency location may be determined as the lowest subcarrier index (Subcarrier#0 of the PRB#0) of the lowest PRB index (PRB#0 of NR SL SSB) to which the NR SL-SSB is allocated. As another example, another subcarrier index of another PRB to which the NR SL-SSB is allocated may be used, and is not limited to the above-described embodiment.

In addition, as an example, a frequency location suitable for a UL PRB boundary may be additionally indicated through additional NR-SL SSB subcarrier offset signaling to the above two signaling (“ARFCN-ValueNR” or “GSCN”) . In this case, the subcarrier offset value between the frequency location indicated by the “ARFCN” or “GSCN” value and the UL PRB may be provided to the UE through signaling. Through this, the terminal can check information on the UL PRB boundary and provide PRB information for V2X sidelink transmission and reception.

Embodiment 1-1-1-2 (NR SL-SSB frequency location indicated by providing offset value relative to Point A location for UL carrier indicated by absoluteFrequencyPointA value in FrequencyInfoUL)

As another example, by providing an offset value relative to the “Point A” position for the UL carrier provided by the base station, the smallest subcarrier index of the center PRB of the NR SL-SSB (e.g. subcarrier #0 of RB#10 of NR- The SL SSB (when the total number of PRBs in the NR-SL SSB is 20) may be indicated to the UE. In this case, “Point A” may be information on a starting position in the provided UL carrier. If an offset value is provided, the frequency location can be identified In addition, for example, the frequency location is determined by the lowest subcarrier index (Subcarrier#0) of the lowest PRB index (PRB#0 of NR SL SSB) to which the NR SL-SSB is allocated. of the PRB# 0) As another example, another subcarrier index of another PRB to which the NR SL-SSB is allocated may be used, and is not limited to the above-described embodiment.

As another example, the above-described offset value may be indicated using the number of PRBs derived based on a specific subcarrier spacing value for each frequency band.

More specifically, as FR1 that is 6 GHz or less, the number of PRBs is determined based on a reference SCS (Reference SCS), and may be indicated based on this. As an example, a case where the reference SCS is 15 kHz may be considered. In addition, the smallest value among SCSs supportable in the NR SL frequency band existing within the FR1 frequency range may be the reference SCS. For example, when the SCSs defined for each NR sidelink frequency band in FR1 are 30 kHz, 60 kHz, or (30 kHz and 60 kHz) SCSs, the smallest value of 30 kHz can be determined as the reference SCS. In this case, as described above, the offset may be indicated by considering the number of PRBs determined based on the reference SCS.

Also, for example, in FR2, which is a frequency exceeding 6 GHz, the reference SCS may be 60 kHz. In this case, the PRB may be determined based on the reference SCS, and the offset may be indicated by considering the number of PRBs determined based on the reference SCS, and is not limited to the above-described embodiment.

Embodiment 1-1-1-3 (Indication of NR SL-SSB frequency position through an offset value relative to the start of “Transmission BW” of UL carrier)

As another example, the NR SL-SSB frequency position may be indicated through a relative offset value with respect to the start position of the transmission bandwidth of the UL carrier.

10 is a diagram illustrating a method of indicating a NR SL-SSB frequency position based on a start position of a transmission bandwidth.

In more detail, referring to FIG. 10 , information on the start (offsetToCarrier), bandwidth (carrierBandwith) information, and SCS value of available frequency resources may be provided to the frequency information on the UL carrier. At this time, among the above-mentioned information, a UL frequency resource that is separated by “offsetToCarrier” from “Point A” can be used in actual data transmission. For example, CRB (Common Resource Block) for initial access can be transmitted from “Point A” to a frequency location that is separated by “offsetToCarrier”, and data transmission is performed from “Point A” to “offsetToCarrier” in both actual NR Uu/SL. It can be utilized starting from the location after the distant frequency location. Therefore, as a method for indicating the location of the NR SL-SSB, it may be induced and indicated based on the above-described information.

Specifically, the NR SL-SSB location may indicate the corresponding NR SL-SSB frequency location through additional offset values (offsetToSLSSB#1 and offsetToSLSSB#2) from the time the transmission bandwidth (transmission BW) of the UL carrier starts. That is, the frequency position of each SL-SSB block may be indicated by calculating the offset value for each SL-SSB block from the point at which the transmission BW of the UL carrier starts.

In addition, the additional offset “offsetToSLSSB” may be indicated with the number of PRBs. In this case, the SCS derived from the number of PRBs may be the SCS of the UL carrier or the SCS of the NR SL-SSB, and is not limited to the above-described embodiment.

Embodiment 1-1-1-4 (indicating NR SL-SSB frequency location through an offset value relative to the start of “Initial UL active BWP” defined for random access)

As another example, the NR base station may indicate the NR SL-SSB frequency location through an offset value relative to the start of “Initial UL active BWP” defined for random access. At this time, as an example, information included in the SL-OSI may be used when the terminal checks the NR SL-SSB frequency location. In this case, the RMSI (SIB1) may be transmitted before the SL-OSI, and the terminal may check the frequency location information more quickly when the NR SL-SSB frequency location is checked through the RMSI (SIB1). Considering the above, information on “initial UL active BWP” provided by RMSI (SIB1) can be used to indicate the location of the NR SL-SSB frequency. That is, based on the initial UL activation BW, the NR SL-SSB location can be indicated by providing a relative offset value at the frequency where the corresponding BWP starts, and through this, the frequency location of the NR SL-SSB can be quickly indicated to the UE. . Also, as an example, the frequency position of the NR SL-SSB may be indicated through a relative offset or an additional offset “offsetToSLSSB”. Meanwhile, as an example, the relative offset or additional offset “offsetToSLSSB” may be indicated based on the number of PRBs. In this case, the SCS based on the PRB number determination may be the SCS of the UL carrier or the Initial UL active BWP SCS (e.g. Msg.1 SCS or Msg.3 SCS), and is not limited to the above-described embodiment.

Embodiment 1-1-1-5 (NR SL-SSB frequency location indication through offset value relative to NR sidelink resource pool start (subcarrier#0 of PRB#0))

As another example, the base station may indicate the NR SL-SSB frequency position through a relative offset value at the start of the NR sidelink resource pool. 11 is a diagram illustrating a method of indicating a NR SL-SSB frequency position based on an NR sidelink resource pool.

More specifically, the NR base station may provide the terminal with information on the sidelink resource pool as well as configuration information for transmission of synchronization information through the NR SL OSI. At this time, configuration information for transmission of synchronization information for transmission of the NR SL-SSB associated with the resource pool list in the NR SL OSI may be provided. In this case, at least one resource pool may be associated with a specific SL-SSB, and the base station may provide synchronization information setting information associated with the resource pool to the terminal. Therefore, by providing an additional offset value to the UE at a specific frequency location (e.g. subcarrier#0 of PRB#0 for a NR SL resource pool/pool list) of each NR sidelink resource pool, the UE can obtain the NR SL associated with the resource pool SSB frequency location can be confirmed. For example, referring to FIG. 11 , an offset value may be indicated based on the start position of “SL resource pool#1”. For example, the starting position of “SL resource pool#1” may be determined based on “subcarrier#0 of PRB#0 for a NR SL resource pool 1”. In this case, the frequency location of SL-SSB#1 as an SL-SSB associated with “SL resource pool#1” may be indicated by an additional offset value (offsetToSLSSB#1). Similarly, the starting position of “SL resource pool#2” may be determined based on “subcarrier#0 of PRB#0 for a NR SL resource pool 2”. In this case, as the SL-SSB associated with “SL resource pool#2”, the frequency location of SL-SSB#2 may be indicated by an additional offset value (offsetToSLSSB#2). Meanwhile, similar to the above-described embodiments, a relative offset or an additional offset “offsetToSLSSB” may be indicated based on the number of PRBs. In this case, the SCS based on the number of PRBs may be determined based on the SCS set in the corresponding resource pool, and is not limited to the above-described embodiment.

Also, as an example, the above-described signaling may be indicated in units of the number of PRBs or a plurality of PRBs (e.g. subchannel). In this case, the subchannel may be a frequency resource that can be defined and used as a minimum data scheduling unit set for each resource pool.

Embodiment 1-1-2 (in case of RRC connection mode terminal)

As another example, a case in which the UE is in an RRC Connected mode may be considered. At this time, the terminal may be provided with information on the above-described embodiments 1-1-1-1 to 1-1-1-5 through an RRC reset message. That is, the terminal can obtain the above-described information through an RRC reconfiguration message. At this time, the RRC connected mode terminal may add the NR SL-SSB based on information received through the RRC resetting message in the location information on the NR SL-SSB frequency provided through the OSI. In addition, as an example, the RRC connected mode terminal resets (or overwrites, overwrites) to new NR SL-SSBs based on information received through an RRC reset message in location information on the NR SL-SSB frequency provided through OSI can do.

For example, the UE may receive one NR SL-SSB#1 through system information of the NG-RAN and operate in an IDLE/INACTIVE mode. Thereafter, when the terminal is switched to the RRC connection mode and operates, NR SL-SSB#2 is additionally configured in the terminal to improve reliability in detecting a synchronization information reference source and timing. Accordingly, a terminal provided with the corresponding setting may receive a plurality of SL-SSBs each having a plurality of SLSSID values. In this case, the UE may assume that the plurality of SL-SSBs provide the same synchronization source and timing value. In addition, as an example, if the terminal does not additionally receive QCL (Quasi Co-Located) related signaling, the terminal may assume that a plurality of SL-SSBs are located quasi-co with each other, and is not limited to the above-described embodiment. don't

At this time, as an example, when two or more SL-SSBs are configured in one terminal and related QCL settings are provided, the terminal sets the timing value and RSRP value through the SL-SSB based on the QCL type based on the provided QCL setting can be measured In this case, the QCL may mean that the UE assumes that the SLSS and/or PSBCH DMRSs in the plurality of SL-SSBs are quasi-co-located with each other in terms of Doppler shift, Doppler spread, average delay, delay spread, and spatial Rx parameter. .

Embodiment 1-1-3 (In case of OOC terminal (in case of Pre-configuration))

As another example, a case where the UE exists outside the coverage of the NG-RAN base station may be considered. That is, if a terminal existing in out-of-coverage has not received system information in advance, it can be provided based on previously set information. For example, the preset information may be provided to the terminal by including the signaling method for the above-described embodiments 1-1-1-1 to 1-1-1-5, and is limited to the above-described embodiments. It doesn't work.

Embodiment 1-2 (when ng-eNB (E-UTRA) base station provides location of NR SL-SSB physical resource to NR V2X terminal)

As another example, in the above-described embodiment 1-1, the case where the NR base station indicates the frequency position of the NR SL-SSB to the NR V2X terminal has been described. That is, the above-described embodiment may be in the form of providing configuration information for transmitting NR sidelink synchronization information to terminals in the form of system information from the NR base station.

In this case, as an example, a case where the UE is located within the coverage of the NG-eNB base station may be considered. At this time, the UE can check information for NR SL-SSB transmission only when it receives configuration for NR side synchronization information transmission included in system information transmitted on the NG-eNB DL carrier.

That is, the NR sidelink terminal can receive synchronization setting information for NR sidelink V2X communication within LTE coverage through LTE DL. Therefore, the NR sidelink terminal needs to be able to receive system information on LTE DL. At this time, the NR sidelink terminal may perform NR sidelink communication on the NR UL carrier through system information received through LTE DL.

At this time, as an example, among the above-described embodiments 1-1-1-1 to 1-1-1-5, the embodiment 1-1-1-4 considers the use of ultra-wideband in NR, and the initial UL activation BWP Since it is information about the start position of , it may not be included in system information received through LTE DL. However, other embodiments other than the above-described embodiment 1-1-1-4 may be provided to the NR sidelink terminal through system information on the LTE DL. That is, since embodiment 1-1-1-4 is an operation that can be considered in an NR DL carrier, it may be difficult to apply to LTE DL system information and may be applicable to other signaling methods.

Example 2 (time domain view)

Based on the above-described embodiment 1, the NR SL SSB frequency location may be indicated. At this time, it is necessary to additionally indicate the location of the time transmission resource for the NR SL SSB. As an example, a case in which an NR sidelink terminal performs NR sidelink V2X communication within 3GPP network coverage (i.e. LTE and NR base station) may be considered. At this time, the NR SL SSB transmission position needs to be determined in the time domain, and at this time, DL/FL/UL resource configuration on the LTE/NR Uu link needs to be considered.

In the following, a method for NR SL SSB transmission time resources independently of a method for configuring a resource pool for NR sidelink V2X communication is described. That is, it can be associated with the frequency location of the NR SL SSB like the above-described embodiment 1, but it can be indicated independently since it is a time resource, and is not limited to the above-described embodiment.

At this time, as an example, NR sidelink V2X communication is operated in a high frequency band area and may be performed based on a plurality of beams to cope with signal attenuation. Therefore, there is a need to consider this also in NR SL SSB transmission. However, as an example, it may be possible to operate based on a single beam according to terminal implementation or characteristics of an operated band, and is not limited to the above-described embodiment.

However, in consideration of the above-mentioned environment, unlike the LTE sidelink, the NR sidelink for NR V2X needs to transmit a synchronization signal (PSSS / SSSS) and a broadcast channel (e.g. PSBCH) in the form of one block. There is a need to transmit periodically in the time domain with a structure.

Also, for example, DL/FL/UL slots and symbols may be variably configured in both NR FDD/UL and TDD. However, considering the system operation of the NR system, there is a need to ensure DL SSB transmission and reception operations. That is, there is a need to ensure operation of DL SSB transmission and reception considering that information is necessarily provided as system information. For this purpose, the time and frequency domains in which the DL SSB is transmitted need to be always set to DL. In addition, the terminal may also perform a DL SSB reception operation based on the above-described setting. That is, the NR base station can set DL SSB indexes that transmit DL SSBs to always operate as DL symbols. For example, regardless of FDD/TDD/SUL, the ratio of DL/FL/UL symbols can be periodically adjusted for each slot through a Slot Format Indicator by DCI format 2_0 with SFI-RNTI (SFI) indicator. At this time, as an example, the DL SSB transmitted by the NR base station in the cell may indicate related signaling to DL so that it is always DL.

Also, as an example, in the TDD UL-DL configuration, a symbol through which a corresponding DL SSB is transmitted can always be a DL slot/symbol (slot/symbols). Based on the foregoing, the terminal may also perform a reception operation assuming that the symbol to which the DL SSB is always transmitted is DL.

At this time, it may be necessary to determine at what point the NR SL-SSB is transmitted in consideration of the above. That is, since DL-SSB transmission must be guaranteed, the SL-SSB needs to be transmitted avoiding at least the time when the DL-SSB is transmitted.

For example, in the case of TDD, since DL/UL cannot exist simultaneously, the SL-SSB can be transmitted avoiding the transmission time of the DL-SSB. In addition, as an example, even in the case of FDD, if a UE has only one transmit/receive RF chain, multiplexing of a signal transmitted on DL (e.g. DL SSB) and a signal transmitted or received on UL (e.g. SL-SSB) will be restricted. can

Also, as an example, setting the above-described FDD and TDD to have the same SL-SSB time transmission structure can simplify implementation, and is not limited to the above-described embodiment. Considering the foregoing, in the following, it may be considered that the locations of the time resources of the DL SSB and the SL SSB are determined using a Time Division Multiplexing (TDM) method. In the following, a more detailed SL-SSB burst set will be described.

More specifically, the position of the SL SSB burst in the time domain may be indicated. For example, NR-SL SSB transmission may configure one NR-SL SSB burst set in the time domain. At this time, like the NR system, the NR sidelink may also consider beam-based transmission in order to provide signal attenuation, coverage maintenance, and transmission efficiency on a high frequency band. Accordingly, one NR-SL SSB burst set may include one or more NR-SL SSBs.

)가 설정될 수 있다. 이때,

는 하나의 값으로 고정하여 사용될 수 있다. 또한, 일 예로,

는 [5, 10, 20, 40, 80, 160, 320, 640ms] 중에 어느 하나로 설정될 수 있다. 또한, 일 예로,

는 사전에 설정될 수 있으며, 상술한 실시예로 한정되지 않는다.At this time, for example, the period of the NR-SL SSB burst set (

) can be set. At this time,

can be used by fixing it to a single value. Also, for example,

may be set to any one of [5, 10, 20, 40, 80, 160, 320, 640 ms]. Also, for example,

may be set in advance, and is not limited to the above-described embodiment.

)이 설정될 수 있다. 이때,

길이는 복수 개의 값들 중 어느 하나가 선택되어 사용될 수 있다. 또한, 일 예로, NR-SL SSB 버스트 셋의 시작 지점(

)이 설정될 수 있으며,

을 지시하는 시그널링이 필요할 수 있다. 즉, NR-SL SSB 버스트 셋에 있어서 주기 정보인

, 시간 윈도우 정보인

및 시작 지점에 대한 정보인

이 필요할 수 있다.In addition, the time window period of the NR-SL SSB burst set (

) can be set. At this time,

As for the length, any one of a plurality of values may be selected and used. In addition, as an example, the starting point of the NR-SL SSB burst set (

) can be set,

Signaling indicating may be required. That is, period information in the NR-SL SSB burst set

, which is the time window information

and information about the starting point.

this may be needed

를 설정하는 방법일 수 있다. 또한, 하기 표 12는 NR-SL SSB 버스트 셋의 시작 지점에 대한 정보인

에 대한 정보일 수 있다.At this time, as an example, Table 11 below is the time window length of the NR-SL SSB burst set

It may be a way to set In addition, Table 12 below is information on the starting point of the NR-SL SSB burst set.

may be information about

More specifically, the time window length of the NR-SL SSB burst set may be indicated based on a unit of 5 ms, which is a unit of a half frame, as shown in option 1 of Table 11 below. At this time, as an example, up to K units of 5 ms may be set, and an instruction based thereon may be performed.

Also, as an example, the time window length of the NR-SL SSB burst set may be indicated in units of the number of slots, which is shown in option 2 of Table 11 below. At this time, for example, up to 320 slots may be set, and an instruction based thereon may be performed.

In addition, the time window length of the NR-SL SSB burst set may be indicated based on the set number of SSBs, which is shown in option 3 of Table 11 below. At this time, for example, the number of SSBs may be set up to L, and an instruction based on this may be performed.

In addition, the time window length of the NR-SL SSB burst set may be indicated by “msec” as a time unit, which is the same as option 4.

[Table 11]

Also, as an example, the start point of the NR-SL SSB burst set may be indicated based on Table 12 below. In this case, the start point of the NR-SL SSB burst set may be indicated based on the “NR SL-OffsetIndicatorSyn” parameter, and a specific indication method may be shown in Table 12 below.

More specifically, the start point of the NR-SL SSB burst set may be indicated in units of 5 ms. In this case, since each half frame in one frame is 5 ms, the starting point may be indicated through a value of 0 or 1, which is shown in option 1 of Table 12.

In addition, the starting point of the NR-SL SSB burst set may be indicated in units of slots, and the starting point may be indicated by indicating the slot location, as shown in option 2 of Table 12.

Also, the start point of the NR-SL SSB burst set may be indicated by the SSB index. At this time, the starting point may be indicated through the SSB index value, which is shown in option 3 of Table 12.

In addition, the start point of the NR-SL SSB burst set may be indicated in units of msec. For example, as the above-described “TDD UL-DL transmission periodicity”, the location of the starting point may be indicated based on P msec, which is shown in option 4 of Table 12.

[Table 12]

That is, as described above, time domain resource information for the NR-SL SSB burst set may be indicated. At this time, as an example, the terminal needs to determine actually usable SL SSBs within the indicated time domain resource. More specifically, there may be a case where the UE is unavailable even though time domain resource information for the NR-SL SSB burst set is indicated.

For example, in the case of FDD/SUL, all SL SSBs within the indicated SL-SSB burst window may be located on the UL. Accordingly, the UE can determine all SL SSBs within the SL-SSB burst window as available SSBs.

On the other hand, as another example, in the case of TDD, one bandwidth part/carrier (BWP/Carrier) may be separately set based on time as DL/FL/UL. At this time, in order for the terminal to transmit SL SSBs within the SL-SSB burst window, resources corresponding to “UL slots” or “UL slots + symbols” may be required. Accordingly, among SL SSBs, SL SSBs located in “UL slot” or “UL slot + symbol” may be determined as available SL SSBs.

Also, as an example, a case in which the SL SSB can exist only in a UL slot composed of only UL symbols may be considered. In this case, only UL slots within the SL SSB burst window may be considered as candidates for SL SSB transmission, and signaling based thereon may be performed. This will be described later.

As another example, a V2X terminal with SFI set may be considered. At this time, as an example, SFI may not be set to the NR V2X terminal in consideration of V2X implementation and operation. As another example, SFI may be configured for the V2X terminal in consideration of association with the NR Uu link. For example, when SFI is configured in the UE, the UE may recognize that SL SSBs exist only in the UL slot or the UL slot + symbol.

In the following, specific embodiments based on time domain resource information for the SL-SSB burst window indicated as described above and a method for determining available SL SSBs of the UE will be described.

Example 2-1 (start offset in 5 ms unit and SL SSB burst window interval in 5 ms unit)

12 and 13 are diagrams illustrating a method of constructing and indicating an NR SL SSB burst set. More specifically, as an example, the offset of the start point of the SL SSB burst set may be indicated in units of 5 ms. Also, as an example, the SL SSB burst window period may also be set in units of 5 ms.

At this time, the transmission position of the SL SSB burst set may be indicated by Equation 3. In this case, based on Equation 3, the start point (NR SL-OffsetIndicatorSync) of the SL SSB burst set may be indicated by a direct frame number (DFN) and a half frame as a mod function for the period of the SL SSB burst set. In this case, the half frame may be indicated as 0 or 1 as described above in units of 5 ms.

[Equation 3]

)는 하나의 값으로 고정하여 사용될 수 있다. 또한,

는 {5, 10, 20, 40, 80, 160, 320, 640msec} 중에서 어느 하나로 설정하거나 미리 설정된 값일 수 있으며, 이는 상술한 바와 같다.More specifically, in Equation 3, DFN may be a frame index for time domain reference of NR sidelink. Also, Hf is a half frame index, and a value of 0 may correspond to the first 5 ms of DFN. Also, a value of 1 (or 5) may correspond to 5 ms after DFN. In addition, as an example, NR-SL SSB burst set periodicity (

) can be used by fixing it to one value. also,

may be set to one of {5, 10, 20, 40, 80, 160, 320, 640 msec} or may be a preset value, as described above.

In this case, “NR SL-OffsetIndicatorSync” as the above parameter may indicate an actual NR-SL SSB burst set transmission period to the UE through system information transmitted from the NG-RAN base station or an RRC reset message. That is, the terminal can obtain information on “NR SL-OffsetIndicatorSync” and check the starting point based on Equation 3 described above. In addition, the indicated time interval may be used for NR SL-SSB transmission.

는 TDD UL-DL 설정이 적용되는 하나의 주기를 나타낼 수 있다. 이때,

은 {0.5, 0.625, 1, 1.25, 2, 2.5, 5, 10} 중 어느 하나의 값이 설정될 수 있다. 이때, TDD 동작은 상술한 바와 같이 설정된

값에 기초하여 수행될 수 있다. TDD인바 단말은 UL 자원을 확인하여 시간 도메인의 위치를 확인할 수 있다. 이때, 일 예로, TDD UL-DL 설정 지시자는 DL와 FL 및 UL 슬랏/심볼의 비율이

주기 내에 어떻게 구성되는지를 지시할 수 있으며, 이에 기초하여 동작할 수 있다.Also, for example,

may indicate one period to which TDD UL-DL configuration is applied. At this time,

may be set to any one of {0.5, 0.625, 1, 1.25, 2, 2.5, 5, 10}. At this time, the TDD operation is set as described above.

It can be done based on value. The TDD terminal can check the location of the time domain by checking the UL resource. At this time, as an example, the TDD UL-DL configuration indicator is the ratio of DL to FL and UL slots / symbols

It can indicate how it is configured within the cycle, and can operate based on it.

In this case, as an example, FIG. 12 may be a method of configuring and indicating an NR SL SSB burst set in FDD/SUL. Also, FIG. 13 may be a method of constructing and indicating an NR SL SSB burst set in TDD.

값이 320ms 인 경우, 해당 주기내에 가능한 5ms 단위의 오프셋 값 (NR SL-OffsetIndicatorSync)은 64개가 존재할 수 있다. 이때, 각각의 오프셋 값은 {0, 5, 10, 15, 20, …315msec}를 나타낼 수 있다. 다만, 상술한 바는 하나의 일 예일 뿐,

및 오프셋 시간 단위 값이 변경되어 설정될 수 있다.For example, referring to FIG. 12 , information on the start time of the SL-SSB burst time window may be indicated through the “NR SL-OffsetIndicatorSync” parameter based on a 5 ms time unit, as described above. That is, the start position of an SL-SSB burst within one SL SSB burst set period may be indicated through the above-described parameter in units of 5 ms. As a specific example, in Equation 3

When the value is 320 ms, there may be 64 possible offset values (NR SL-OffsetIndicatorSync) in units of 5 ms within the corresponding period. At this time, each offset value is {0, 5, 10, 15, 20, ... 315 msec}. However, the above is only an example,

And the offset time unit value may be changed and set.

In addition, as an example, the SL-SSB burst window time period (SL-SSB burst window) may be set based on a predetermined value (e.g. 5 msec) or a set value (e.g. configuration or preconfiguration information from an LTE / NR cell). At this time, based on each predefined SL-SSB time position within the window time interval, the terminal may select SL-SSBs and perform transmission. At this time, the SL-SSB time positions predetermined in FIG. 12 may correspond to “SL-SSB candidates”. At this time, as an example, “SL-SSB candidates” may exist at a predetermined position within a predetermined time window using at least two parameters (offset, window).

파라미터는 TDD UL-DL 설정 정보를 기반으로 “SL-SSB candidate”들이 위치할 수 있는 UL 시간 자원 영역을 확인하는데 이용될 수 있다. 즉, SL-SSB 버스트 윈도우 내에 UL 자원 영역을 확인할 수다. 다만, 일 예로, 기지국의 추가적인 설정이나 시그널링 또는 기설정(preconfiguration)에 따라서 플렉서블(Flexible) 심볼도 SL-SSB 전송을 위해 고려될 수 있다. 즉, 추가 설정에 기초하여 SL-SSB 전송이 수행될 수 있으며, 상술한 실시예로 한정되지 않는다.Also, as an example, FIG. 13 is a diagram illustrating a case of TDD. In this case, in TDD, unlike FDD/SUL, DL, FL (Flexible Symbols), and UL may be divided in the time domain. At this time, the above-mentioned

The parameter can be used to check the UL time resource area where “SL-SSB candidates” can be located based on the TDD UL-DL configuration information. That is, it is possible to check the UL resource region within the SL-SSB burst window. However, for example, a flexible symbol may also be considered for SL-SSB transmission according to additional configuration, signaling, or preconfiguration of the base station. That is, SL-SSB transmission may be performed based on additional settings, and is not limited to the above-described embodiment.

Embodiment 2-2 (Slot (or slot + OFDM symbol) unit start offset and slot (or slot + OFDM symbol) unit SL SSB burst window period)

14 and 15 are diagrams illustrating a method of setting a start offset and an SL SSB burst window period based on a slot (or slot + OFDM symbol) unit.

For example, in the case of indicating a start offset based on a slot unit, it may be configured as in Equation 4 below.

[Equation 4]

는 1ms 시간에 해당하는 서브프레임 내에 존재하는 슬롯의 수를 의미할 수 있다. 또한, 일 예로, “NR-SL SSB burst set periodicity (

)는 하나의 값으로 고정하여 사용될 수 있다. 또한, 일 예로,

은 {5, 10, 20, 40, 80, 160, 320, 640msec} 중에서 어느 하나로 설정되거나 미리 설정될 수 있으며, 이는 상술한 바와 같다.At this time, similar to Equation 3, DFN (Direct frame number) may be a frame index for time domain reference of NR SL. In addition, the slot number is an index of a slot that can exist in the DFN and may have a value between 0 and 320. also,

may mean the number of slots present in a subframe corresponding to 1 ms time. In addition, as an example, “NR-SL SSB burst set periodicity (

) can be used by fixing it to one value. Also, for example,

may be set to one of {5, 10, 20, 40, 80, 160, 320, 640 msec} or preset, as described above.

In addition, “NR SL-OffsetIndicatorSync” may indicate an actual NR-SL SSB burst set start point to the UE through system information or an RRC reset message transmitted from the NG-RAN base station. At this time, the terminal may use the indicated time interval for NR SL-SSB transmission, and may be similar to embodiment 2-1.

However, it may be different in that the base station configures or preconfigures the “NR SL-OffsetIndicatorSync” offset value and the SL-SSB burst window size in units of slots. That is, instead of setting in units of 5 ms, it may be set in units of slots.

At this time, as an example, an offset value may additionally indicate a slot index + an OFDM symbol index. As an example, the above-described offset value may be effective for a V2X terminal configured with SFI as shown in FIG. 15 and a V2X terminal operating in a TDD network as shown in FIG. 14.

More specifically, the TDD configuration or the SFI configuration may be indication information providing a combination of DL/FL/UL within a slot. In this case, UL OFDM symbols cannot be accurately indicated in units of slots/msec. In addition, as an example, in order to satisfy the requirements of the V2X service, which is one of the URLLC services, it is necessary to consider the symbol level data transmission and reception operation in NR V2X as well. Therefore, in the above description, a combination of “slot” or “slot + OFDM symbol” may be indicated in order to perform a more accurate indication, and is not limited to the above-described embodiment. Also, as an example, the SL-SSB burst window size may be indicated by a combination of “slot” or “slot + OFDM symbol”, and is not limited to the above-described embodiment.

Embodiment 2-3 (start offset in SL-SSB units and SL SSB burst window interval in SL-SSB units)

As another example, the start offset in SL-SSB units and the SL SSB burst window interval in SL-SSB units may be indicated to the terminal through the SL-SSB index and its number. More specifically, an index may exist in each SL-SSB, and similar to the embodiment 2-1 and embodiment 2-2, the frame index and the index for the SL-SSB as a DFN are used to determine the SL-SSB burst. You can indicate the starting point. In addition, the SSB burst window size can also be indicated using the SL-SSB index used, and is not limited to the above.

Embodiment 3 (Method for Indicating Additional SL-SSB Resources Provided in 3GPP Network or Pre-Configuration)

Based on the above-described embodiments 1 and 2, the frequency position and time position of the SL-SSB burst set may be indicated.

In this case, for example, an SL-SSB resource may be additionally indicated based on information provided from a 3GPP network or preset.

More specifically, in the above description, through the SL-SSB resource indication method within the SL-SSB burst window, V2X terminals can perform channel transmission for transmitting synchronization and MIB information on the corresponding resource. However, all NR SL-SSBs within the corresponding NR-SL SSB burst set time interval may not be used for actual transmission. For example, the NR base station may not allow transmission of SL-SSBs. More specifically, in the NR system, only the NR base station could transmit the DL SSB. However, one or a plurality of UEs capable of SL-SSB transmission may exist in one cell in consideration of the NR sidelink. That is, unlike the existing NR system, since there are many terminals capable of transmitting SL-SSB in one cell, the NR sidelink is based on at least one of the RF capabilities of each terminal, antenna configuration and number, and beamforming transmission method Thus, the number of SL-SSBs to be actually used can be set differently for each terminal. Therefore, additional signaling on whether transmission of SL-SSBs is permitted by the NR base station may be required.

At this time, only the NR base station can transmit the DL SSB, but the NR base station can also schedule resources for UL data transmission to terminals in the cell for data transmission and reception on the NR Uu link. To this end, the NR base station may need to configure a UL channel (e.g. configured PUSCH) and signals (e.g. SRS). Accordingly, use of uplink transmission resources of the NR Uu link may be limited for SL-SSB transmission. Therefore, the LTE/NR base station of the 3GPP network needs to additionally signal the SL-SSB transmission index usable within the NR-SL SSB burst set time to the NR sidelink terminals. Through this, it is possible to increase the efficiency of NR UL carrier resource utilization.

In the following, as a more specific case, a method for indicating an additional SL-SSB resource of a base station in the case of TDD and FDD/SUL will be described.

At this time, in the following embodiment, based on the above-described embodiments 1 and 2, the terminal checks the configuration information for the start of the SL-SSB burst window and its size, and additionally configures the actual network as “configured SL SSB candidate” information A case in which information on available SL-SSBs is received may be considered. At this time, the terminal may transmit the final SL-SSB from the “SL SSB candidate” determined by the terminal itself among the indicated “configured SL SSB candidates”.

In addition, as an example, when additional signaling is not provided to the terminal, the terminal can use the “SL SSB candidate” available only based on configuration information about the start and size of the SL-SSB burst window performed in Embodiments 1 and 2. , and is not limited to the above-described embodiment.

In this case, as an example, FIG. 16 may be an operation for additional signaling based on the above in consideration of the case of TDD. 17 may be an operation for additional signaling based on the above in consideration of the case of FDD/SUL with SFI.

For example, the value “L” in FIGS. 16 and 17 may be the number of SL-SSBs in an NR SL-SSB burst set. In this case, for example, the L value may be determined differently according to the range of the frequency band in which the NR sidelink operates, which may be shown in Table 13 below. For example, the L value may increase as the frequency increases. That is, in the case of using a wideband as a high frequency, the number of SL-SSBs may increase.

[Table 13]

Also, as an example, in FIGS. 16 and 17, the “N” value may be a resource index and number allowed by the network for transmission of NR-SL SSBs among L. At this time, the base station may indicate information about the N value to the NR sidelink terminals. For example, the indication method may be a bitmap or an index value, but is not limited to the above-described embodiment.

At this time, as an example, if the terminal does not receive the above-described information on the “N” value, the terminal may determine the SL-SSB actually used based on a predetermined value. Also, as an example, the terminal may determine the SL-SSB actually used based on the NR SL SSB index based on the above-described L value.

Also, as an example, the “K” value in FIGS. 16 and 17 may be the number of NR-SL indexes actually used by the corresponding terminal.

In more detail, referring to FIGS. 16 and 17, the terminal may receive an indication of the frequency location and time location of the SL SSB burst set based on the above-described embodiments 1 and 2, based on which Thus, SL SSB Candidates may be determined. Then, as described above, information on the resource index and the number of resources allowed in the network (“N” value) may be additionally signaled. At this time, the NR sidelink terminals that have received the above information determine actual transmission by considering the beam transmission characteristics and antenna/RF configuration and transmission method for each terminal among the indicated one or more NR-SL SSB indexes. SSB index and number (“K” value) and beam type can be determined. After that, each terminal may perform each NR-SL SSB transmission. In this case, as an example, SL-SSB transmission may be performed based on a different SL-SSB index with a potentially different “K” value for each UE, and is not limited to the above-described embodiment.

More specifically, the NR sidelink terminal corresponds to the number (“N” value) of NR-SL SSBs indicated in the actual network among the L transmittable SSBs according to the frequency band and the set of symbols in the slot corresponding to the index Can be determined there is. After that, the UE can configure and disable downlink on symbols in slots corresponding to the indicated NR SL-SSB indices. The network (base station) can ensure that the corresponding symbols are always UL. That is, both the network and the NR sidelink terminal can mutually guarantee that symbols in a corresponding slot are always UL. Therefore, from the viewpoint of the NR sidelink terminal, transmission can be performed by always selecting a desired NR SL-SSB.

Also, for example, based on the above, NR SL-SSB transmission symbols may be stably transmitted and received without colliding with DL transmission (e.g. PDSCH, CSI-RS, etc.) on the NR Uu link. At this time, as an example, from the network point of view, based on the above, the slot format indicator (the DL / FL / UL symbol structure indicator in the slot indicated through the common PDCCH scrambled with SFI-RNTI) is indicated to correspond to the UL symbols. can In addition, as an example, in the case of TDD, at least one of “TDD UL-DL configurationCommon”, “TDD UL-DL configurationCommon2” and “TDD UL-DL configurationDedicated” is provided to NR Uu terminals to indicate correspondence to UL symbols can do.

Also, in the foregoing, TDD and FDD/SUL with SFI have been described, but in the absence of SFI, the above-described signaling can be applied by assuming that all slots are composed of only UL symbols. Also, as an example, the SFI value may be applied even in the case of TDD, and is not limited to the above-described embodiment.

As another example, FIG. 18 is a diagram illustrating a case where an SL-SSB available in “UL slot” or “UL slot + symbol” can be located. For example, in FIGS. 16 and 17 described above, a signaling method was described based on the case where an SL-SSB potentially exists in a fixed position regardless of a DL/FL/UL slot or symbol. However, as shown in FIG. 18, whether an SL-SSB that can be used only in UL slots or “UL slots + symbols” can be located. At this time, as an example, the operation of determining the SL-SSB frequency location and time location and receiving additional signaling by the UE based on the embodiments 1 and 2 can be equally applied in FIG. 18, and the above-described embodiment not limited to

Also, as an example, FIG. 19 is a diagram illustrating a floating sidelink SSB burst structure.

Referring to FIG. 19, SL SSB burst transmission may not be performed based on a 5 ms boundary. In this case, for example, a specific slot in a specific DFN may be used as a starting point by using a range of offset values corresponding to the number of slots in the DFN. At this time, transmission can be performed using the SLSS / PSBCH block of the “K” value determined by the transmitting NR V2X terminal among the “L” value, which is the number of SL-SSBs described above, or the “N” value, which is the value allowed by the network. The method is as described above.

Meanwhile, the starting point of the floating SL SSB burst may be indicated by the base station providing the terminal with a “DFN+slot” index value relative to DFN 0 through the “NR SL-offsetIndicatorSync” parameter. At this time, information on the size (or length) of the SL SSB burst may be additionally provided to the UE through the “NR SL-lengthIndicatorSync” parameter. For example, the size may be indicated in units of slots, units of subframes, or units of “ms”. At this time, a candidate position of possible SL-SSBs within the indicated window may be defined as an “L” value, as described above.

In addition, as an example, similar to the case of the 5 ms window described above, the 3GPP network considers settings capable of transmitting SL-SSB on LTE or NR Uu links among the “L” values, and sets the SL-SSB of “N” value set in the network It can be set for each cell through system information. Thereafter, the terminal may determine and transmit the number of SL-SSBs to be actually transmitted as a “K” value in consideration of the terminal's antenna setting, RF capability, beam forming method and coverage, and the like.

Embodiment 4 (when DL SSB burst window and SL SSB burst window overlap)

Also, as an example, FIG. 20 is a diagram illustrating a case where a DL SSB burst window and a SL SSB burst window overlap. At this time, as an example, when transmission of an SL SSB burst is indicated by the above-described “NR SL-OffsetIndicatorSync” value on the same 5 ms as the DL SSB burst set, the SL SSB burst is transmitted through TDM as shown in (a) to (c) of FIG. It can be instructed to the terminal in the form. For example, the DL SSB burst and the SL SSB burst actually transmitted by the NR base station may have a form as shown in FIG. 20(a). Alternatively, the DL SSB burst and the SL SSB burst actually transmitted by the NR base station may have a form as shown in FIG. 20(b). The DL SSB burst and the SL SSB burst actually transmitted by the NR base station may have a form as shown in FIG. 20(c). In this case, since the importance of the DL SSB burst may be high as described above, it is always transmitted first, and the SL SSB burst may be allocated after that. In addition, as an example, the UE can always perform UL transmission at a time resource position corresponding to the SL-SSB transmission index indicated by the network. Therefore, the terminal may not set DL and / or FL symbols in SL-SSB transmission symbols corresponding to the SFI index value indicated by “DCI format 2_0 (DCI format 2_0), and is not limited to the above-described embodiment. .

21 is a diagram illustrating a method of configuring SL-SSB resources.

Referring to FIG. 21, the terminal may receive resource configuration information for SL-SSB transmission from the base station (S2110). At this time, as described above with reference to FIGS. 1 to 20, the terminal uses resources for SL-SSB transmission Configuration information may be received from the base station. In this case, the resource for SL-SSB transmission may be provided to the terminal as frequency location information in terms of the frequency domain. That is, like the above-described embodiment 1, the terminal may receive frequency location information for the SL-SSB from the base station. Also, as an example, resources for SL-SSB transmission may be provided to the terminal as time location information in the time domain. That is, as in the above-described embodiment 2, the terminal may receive time and location information on the SL-SSB from the base station. Also, as an example, the terminal may receive additional information as well as the above-described information from the base station. That is, as in the above-described embodiment 3, the terminal may be instructed with additional information related to the SL-SSB.

In this case, as an example, information on the above-described embodiments 1 to 3 may be information received in association with each other. As another example, the information for each of the above-described embodiments 1 to 3 may be information received independently of each other, and is not limited to the above-described embodiment.

22 is a diagram showing configurations of a base station device and a terminal device according to the present disclosure.

The base station device 2200 may include a processor 2210, an antenna unit 2220, a transceiver 2230, and a memory 2240.

The processor 2210 performs baseband-related signal processing and may include an upper layer processing unit 2211 and a physical layer processing unit 2212. The upper layer processing unit 2211 may process operations of a medium access control (MAC) layer, a radio resource control (RRC) layer, or higher layers. The physical layer processing unit 2212 may process physical (PHY) layer operations (eg, uplink reception signal processing and downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor 2210 may control overall operations of the base station device 2200 .

The antenna unit 2220 may include one or more physical antennas, and may support multiple input multiple output (MIMO) transmission and reception when including a plurality of antennas. The transceiver 2230 may include a radio frequency (RF) transmitter and an RF receiver. The memory 2240 may store information processed by the processor 2210, software related to the operation of the base station device 2200, an operating system, an application, and the like, and may include components such as a buffer.

The processor 2210 of the base station 2200 may be configured to implement the operation of the base station in the embodiments described in the present invention.

The terminal device 2250 may include a processor 2260, an antenna unit 2270, a transceiver 2280, and a memory 2290.

The processor 2260 performs baseband-related signal processing and may include an upper layer processing unit 2261 and a physical layer processing unit 2262. The upper layer processing unit 2261 may process operations of a MAC layer, an RRC layer, or higher layers. The physical layer processing unit 2262 may process PHY layer operations (eg, downlink reception signal processing and uplink transmission signal processing). In addition to performing baseband-related signal processing, the processor 2260 may also control overall operations of the terminal device 2250 .

The antenna unit 2270 may include one or more physical antennas, and may support MIMO transmission and reception when including a plurality of antennas. The transceiver 2280 may include an RF transmitter and an RF receiver. The memory 2290 may store information processed by the processor 2260, software related to the operation of the terminal device 2250, an operating system, an application, and the like, and may include components such as a buffer.

The processor 2260 of the terminal device 2250 may be configured to implement the operation of the terminal in the embodiments described in the present invention.

Matters described in the examples of the present invention may be equally applied to the operations of the base station device 2200 and the terminal device 2250, and redundant descriptions are omitted.

Exemplary methods of this disclosure are presented as a series of operations for clarity of explanation, but this is not intended to limit the order in which steps are performed, and each step may be performed concurrently or in a different order, if desired. In order to implement the method according to the present disclosure, other steps may be included in addition to the exemplified steps, other steps may be included except for some steps, or additional other steps may be included except for some steps.

Various embodiments of the present disclosure are intended to explain representative aspects of the present disclosure, rather than listing all possible combinations, and matters described in various embodiments may be applied independently or in combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. For implementation by hardware, one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general-purpose It may be implemented by a processor (general processor), controller, microcontroller, microprocessor, or the like.

The scope of the present disclosure is software or machine-executable instructions (eg, operating systems, applications, firmware, programs, etc.) that cause operations in accordance with the methods of various embodiments to be executed on a device or computer, and such software or It includes a non-transitory computer-readable medium in which instructions and the like are stored and executable on a device or computer.

Base Station: 2200 Processor: 2210
Upper layer processing unit: 2211 Physical layer processing unit: 2212
Antenna: 2220 Transceiver: 2230
Memory: 2240 Terminal: 2250
Processor: 2260 Upper layer processing unit: 2261
Physical layer processing unit: 2262 Antenna unit: 2270
Transceiver: 2280 Memory: 2290

Claims (6)

In the method for setting the resource by the terminal,
Receiving resource configuration information for transmission of a sidelink-synchronization signal block (SL-SSB) from a base station;
Receiving configured SL-SSB candidate information from the base station; and
Transmitting the SL-SSB based on the received resource setting information and the configured SL-SSB candidate information,
The resource configuration information for the SL-SSB transmission includes SL-SSB frequency location information and SL-SSB time location information,
The SL-SSB frequency location information indicates a raster position and a subcarrier offset of a band through which the SL-SSB is transmitted, and based on the raster position of a band through which the SL-SSB is transmitted, a central physical resource of the SL-SSB The smallest subcarrier index of a physical resource block (PRB) is determined, and a frequency location corresponding to an uplink (UL) PRB boundary is indicated based on the subcarrier offset,
The SL-SSB time location information indicates an SL-SSB burst set period, an SL-SSB burst set start point offset, and an SL-SSB burst window period,
The terminal checks available SL-SSBs among SL-SSBs indicated by the SL-SSB frequency location information and the SL-SSB time location information based on the configured SL-SSB candidate information, and the available SL - A resource configuration method of selecting the transmitted SL-SSB among SSBs.
According to claim 1,
The starting point offset of the SL-SSB burst set and the SL-SSB burst window period are set based on at least one of a slot and a symbol.
According to claim 1,
If the terminal does not receive the configured SL-SSB candidate information from the base station, the terminal selects the available SL among SL-SSBs indicated by the SL-SSB frequency location information and the SL-SSB time location information. - A resource configuration method of directly determining SSBs and selecting the transmitted SL-SSB from among the available SL-SSBs.
In a terminal that performs resource configuration,
transceiver; and
It includes a processor connected to the transceiver,
the processor,
Receiving resource configuration information for SL-SSB transmission from a base station through the transceiver;
Receiving SL-SSB candidate information configured through the transceiver from the base station, and
Transmitting the SL-SSB based on the resource configuration information and the configured SL-SSB candidate information received through the transceiver,
The resource configuration information for the SL-SSB transmission includes SL-SSB frequency location information and SL-SSB time location information,
The SL-SSB frequency location information indicates a raster position and a subcarrier offset of a band through which the SL-SSB is transmitted, and based on the raster position of a band through which the SL-SSB is transmitted, the center physical location of the SL-SSB The smallest subcarrier index of a physical resource block (PRB) is determined, and a frequency location corresponding to an uplink (UL) PRB boundary is indicated based on the subcarrier offset,
The SL-SSB time location information indicates an SL-SSB burst set period, an SL-SSB burst set start point offset, and an SL-SSB burst window period,
Checking available SL-SSBs among SL-SSBs indicated by the SL-SSB frequency location information and the SL-SSB time location information based on the configured SL-SSB candidate information, and selecting the available SL-SSBs A terminal that performs resource configuration, selecting the transmitted SL-SSB from among.
According to claim 4,
The starting point offset of the SL-SSB burst set and the SL-SSB burst window period are set based on at least one of a slot and a symbol.
According to claim 4,
If the terminal does not receive the configured SL-SSB candidate information from the base station, the terminal selects the available SL among SL-SSBs indicated by the SL-SSB frequency location information and the SL-SSB time location information. - A terminal that performs resource configuration by directly determining SSBs and selecting the transmitted SL-SSB from among the available SL-SSBs.

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