KR20180122879A - METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DEMODULATION REFERENCE SIGNAL FOR eV2X - Google Patents

Abstract

The present disclosure relates to a method and apparatus for transmitting or receiving a demodulation reference signal for eV2X. A method for enabling a first terminal to transmit a side link demodulation reference signal (DM-RS) in a wireless communication system according to an embodiment of the present disclosure includes the steps of: transmitting setting information on the DM-RS supporting a plurality of layers to a second terminal; and transmitting the DM-RS and a physical channel to the second terminal based on the DM-RS setting information, wherein the DM-RS setting information includes layer indication information on one or more layers of the plurality of layers, and an orthogonal cover code (OCC) for each of the one or more layers is determined based on the layer indication information.

Description

METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DEMODULATION REFERENCE SIGNAL FOR eV2X FIELD OF THE INVENTION [0001]

The present disclosure is directed to a wireless communication system, and specifically to a method and apparatus for transmitting or receiving a demodulation reference signal for eV2X.

Vehicle-to-X (V2X) communication refers to a communication system that exchanges information such as traffic conditions while communicating with road infrastructure and other vehicles during operation. V2X is a vehicle-to-vehicle (V2V), which refers to communication between vehicles, a vehicle-to-pedestrian (V2P), which refers to communication between terminals carried by the vehicle and an individual, a roadside unit / Vehicle-to-infrastructure / network (V2I / N), which refers to the communication between a network and a network. In this case, the roadside unit (RSU) may be a transportation infrastructure entity implemented by a base station or a fixed terminal. For example, it may be an independent entity that transmits speed notifications to the vehicle.

In addition, the eV2X (enhanced V2X) communication supports a Multiple Input Multiple Output (MIMO) including a Carrier Aggregation (CA) and a Tx diversity in addition to the V2X, a short TTI (Transmission Time Interval) It is being developed with the goal of increasing throughput and reducing latency. However, a method for supporting MIMO transmit diversity for eV2X communication has not yet been established. Specifically, a demodulation reference signal (DM-RS) configuration scheme considering MIMO for eV2X is required.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for transmitting and receiving configuration information for a DM-RS supporting a plurality of layer transmissions on a side link.

A further technical object of the present invention is to provide a method and apparatus for transmitting and receiving setting information for distinguishing a layer to a DM-RS supporting a plurality of layer transmissions on a side link.

It is a further object of the present disclosure to provide a method and apparatus for directing an orthogonal cover code (OCC) or cyclic shift (CS) for a DM-RS supporting multiple layer transmissions on a side link.

The technical objects to be achieved by the present disclosure are not limited to the above-mentioned technical subjects, and other technical subjects which are not mentioned are to be clearly understood from the following description to those skilled in the art It will be possible.

A method for a first terminal to transmit a side link demodulation reference signal (DM-RS) in a wireless communication system according to an aspect of the present disclosure includes transmitting configuration information for a DM-RS supporting a plurality of layers to the second terminal Transmitting; And transmitting the DM-RS and the physical channel to the second terminal based on the DM-RS setting information, wherein the DM-RS setting information includes layer indication information for one or more layers of the plurality of layers, And an orthogonal cover code (OCC) for each of the one or more layers may be determined based on the layer indication information.

The features briefly summarized above for this disclosure are only exemplary aspects of the detailed description of the disclosure which follow, and are not intended to limit the scope of the disclosure.

According to the present disclosure, a method and apparatus for transmitting and receiving configuration information for a DM-RS supporting a plurality of layer transmissions on a side link can be provided.

According to the present disclosure, a method and apparatus for transmitting and receiving setting information for distinguishing a layer to a DM-RS supporting a plurality of layer transmissions on a side link can be provided.

According to the present disclosure, a method and apparatus for indicating an orthogonal cover code (OCC) or cyclic shift (CS) for a DM-RS supporting multiple layer transmissions on a side link can be provided.

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

1, 2 and 3 are views for explaining a V2X scenario related to the present invention.
4 is a diagram illustrating DM-RS symbol positions for a PSSCH according to the present disclosure;
5 is a diagram for explaining DCI and SCI in a BS resource scheduling mode according to the present disclosure;
6 is a diagram for explaining SCI in a terminal autonomous resource selection mode according to the present disclosure;
7 is a diagram for explaining an eV2X DM-RS transmission / reception method according to the present disclosure.
8 is a diagram showing a configuration of a base station apparatus according to the present disclosure.
9 is a diagram showing a configuration of a first terminal device according to the present disclosure.
10 is a diagram showing a configuration of a second terminal apparatus according to the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear. Parts not related to the description of the present disclosure in the drawings are omitted, and like parts are denoted by similar reference numerals.

In the present disclosure, when an element is referred to as being "connected", "coupled", or "connected" to another element, it is understood that not only a direct connection relationship but also an indirect connection relationship May also be included. Also, when an element is referred to as " comprising " or " having " another element, it is meant to include not only excluding another element but also another element .

In the present disclosure, the terms first, second, etc. are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements, etc. unless specifically stated otherwise. Thus, within the scope of this 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 the present disclosure, the components that are distinguished from each other are intended to clearly illustrate each feature and do not necessarily mean that components are separate. That is, a plurality of components may be integrated into one hardware or software unit, or a single component may be distributed into a plurality of hardware or software units. Thus, unless otherwise noted, such integrated or distributed embodiments are also included within the scope of this disclosure.

In the present disclosure, the components described in the various embodiments are not necessarily essential components, and some may be optional components. Thus, embodiments consisting of a subset of the components described in one embodiment are also included within the scope of the present disclosure. Also, embodiments that include other elements in addition to the elements described in the various embodiments are also included in the scope of the present disclosure.

The present disclosure is directed to a wireless communication network, wherein operations performed in a wireless communication network may be performed in a process of controlling a network and transmitting or receiving signals in a system (e.g., a base station) And may be performed in a process of transmitting or receiving a signal from a terminal coupled to a wireless network.

It will be appreciated that various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by a base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), a gNodeB (gNB), an access point (AP) In addition, 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS) .

In this disclosure, transmitting or receiving a channel implies transmitting or receiving information or signals over the channel. For example, transmitting a control channel means transmitting control information or signals through a control channel. Similarly, transmitting a data channel means transmitting data information or signals over the data channel.

The terms used mainly as abbreviations used in the present invention are defined as follows.

D2D: Device to Device (communication)

ProSe: (Device to Device) Proximity Services

SL: Sidelink

SCI: Sidelink Control Information

PSSCH: Physical Sidelink Shared Channel

PSBCH: Physical Sidelink Broadcast Channel

PSCCH: Physical Sidelink Control Channel

PSDCH: Physical Sidelink Discovery Channel

SLSS: Sidelink Synchronization Signal (= D2DSS (D2D Synchronization Signal))

PSSID: Physical-layer Sidelink Synchronization Identity

n ^SA _ID : Sidelink group destination identity

N ^SL _ID : Physical layer sidelink synchronization identity

SA: Scheduling assignment

TB: Transport Block

TTI: Transmission Time Interval

RB: Resource Block

V2V: Vehicle to Vehicle

V2P: Vehicle to Pedestrian

V2I / N: Vehicle to Infrastructure / Network

The control information transmitted from the terminal to the other terminal in the V2X communication can be referred to as SA. When a sidelink (SL) is used as a communication link between terminals, the control information may be referred to as SCI. At this time, the control information can be transmitted through the PSCCH.

In the V2X communication, the data transmitted from the terminal to the other terminal may be configured in TB units. At this time, the data can be transmitted through the PSSCH.

Further, in the present disclosure, an operation mode is defined according to control information for V2X communication or direct link (e.g., D2D, ProSe, or SL) communication, and resource allocation scheme for data transmission.

The eNodeB resource scheduling mode is a mode in which a base station (eNodeB) or a relay node schedules resources used by the UE to transmit V2X (or direct link) control information and / or data, Or a mode in which the terminal transmits the V2X (or direct link) control information and / or data. For example, a base station or a relay node may transmit V2X (or direct link) control information and / or scheduling information on resources to be used for data transmission through V2X (or a direct link) through downlink control information (DCI) To the transmitting terminal. Accordingly, the V2X (or direct link) transmission terminal transmits V2X (or direct link) control information and data to the V2X (or direct link) V2X (or direct link) data based on the control information.

Meanwhile, in the UE autonomous resource selection mode, the UE itself selects resources used by the UE to transmit the control information and data, and the resource selection is performed in a resource pool (i.e., resource Means a mode in which a terminal determines by sensing or the like in a set of candidates, and the terminal transmits the control information and data accordingly. For example, a V2X (or direct link) transmission terminal transmits V2X (or direct link) control information and data to a V2X (or direct link) reception terminal on a resource selected by itself, and a V2X V2X (or direct link) data based on the V2X (or direct link) control information.

For example, the base station resource scheduling mode may be referred to as Mode 1 in direct link communication and Mode 3 in V2X communication. The terminal autonomous resource selection mode can be referred to as Mode 2 (Mode 2) in direct link communication and Mode 4 (Mode 4) in V2X communication.

Embodiments of the present invention will be described below by taking V2X communication as an example. However, the scope of the present invention is not limited to V2X communication, and embodiments of the present invention are applied to direct link-based communication such as D2D, ProSe, .

V2X is a term collectively referred to as V2V, V2P, and V2I / N, and each of V2V, V2P, and V2I / N can be defined as shown in Table 1 in connection with LTE (Long Term Evolution) communication.

V2X communication may include PC5 based communication, which is a D2D communication link (i.e., a direct interface between two devices that support ProSe). For V2X operation, various scenarios such as the following Tables 2, 3, and 4 are considered with reference to FIG. 1, FIG. 2, and FIG.

1, 2 and 3 are views for explaining a V2X scenario related to the present invention.

Table 2 and Figure 1 illustrate scenarios that support V2X operation based only on the PC5 interface (or SL). 1 (a) shows a V2V operation, (b) shows a V2I operation, and FIG. 1 (c) shows a V2P operation.

Table 3 and Figure 2 illustrate scenarios that support V2X operation based only on the Uu interface (i.e., the interface between the UE and the eNodeB). 2 (a) shows the V2V operation, (b) shows the V2I operation, and FIG. 2 (c) shows the V2P operation.

Table 4 and Figure 3 illustrate scenarios that support V2X operation using both the Uu interface and the PC5 interface (or SL). FIG. 3 (a) shows Scenario 3A in Table 4, and FIG. 3 (b) shows Scenario 3B in Table 4.

As described above, the V2X communication may be performed through the base station or through direct communication between the terminals. In this case, in the case of V2X communication based on the LTE based on the base station, transmission / reception can be performed through the Uu link, which is a communication interface between the base station and the terminal of the LTE. When direct communication is performed between the terminals, And a PC 5 link which is a communication interface between the terminal and the terminal.

In LTE, communication from a base station to a terminal is called downlink (DL), and communication from a terminal to a base station is called uplink (UL). From 3GPP LTE Release-12, the communication from the terminal to the terminal in addition to the uplink / downlink is defined as a sidelink (SL).

In LTE, technology item that applied PC5 based side link communication for the first time is D2D which is public safety and proximity communication (Proximity Communication, Prose) for commercial purpose. The next technology item after applying PC5-based side link communication in LTE is V2X, which is a vehicle-based communication.

In addition to V2X, eV2X (enhanced V2X) communication supports Multiple Input Multiple Output (MIMO) and Transmission Time Interval (TTI) including Carrier Aggregation (CA) and Transmit Diversity throughput, and to reduce latency. The eV2X has improved the performance of the V2X to provide more user cases, such as vehicle platooning, extended sensors, advanced driving, and remote driving, .

In this disclosure, a demodulation-reference signal (DM-RS) configuration scheme considering a MIMO scheme such as Tx diversity in an eV2X will be described.

Particularly, in contrast to transmitting DM-RS on one antenna port corresponding to one layer in one PC5-based V2X, the improved PC5-based V2X (hereinafter referred to as eV2X May support transmission of the DM-RS over a plurality of antenna ports corresponding to a plurality of layers.

According to the present disclosure, a DM-RS can be efficiently configured and transmitted while maintaining orthogonality between a plurality of layers.

Before describing the eV2X DM-RS, the uplink reference signal will be described first.

The uplink reference signal may include a demodulation reference signal DM-RS and a sounding reference signal SRS. The DM-RS is a reference signal used for channel estimation for demodulating the received signal. The DM-RS may be combined with the transmission of an uplink data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) or an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)). The SRS is a reference signal transmitted from a mobile station to a base station for uplink scheduling. The base station can estimate the uplink channel through the received SRS and use the estimated uplink channel for uplink scheduling. The SRS is not combined with the transmission of the PUSCH or PUCCH. A basic sequence of the same kind can be used for DM-RS and SRS.

Precoding applied to the DM-RS (i.e., mapping from the layer to the antenna port) in the uplink multi-antenna transmission may be the same as precoding applied to the PUSCH. Cyclic shift separation is a primary scheme for multiplexing DM-RSs. The SRS may not be precoded and may also be an antenna-specific reference signal.

에 따른 PUSCH DM-RS 시퀀스

는 수학식 1에 의해서 정의될 수 있다.Layer

PUSCH DM-RS sequence according to

Can be defined by Equation (1).

는 후술하는 표 6에 따라 결정될 수 있다. In the equation (1), m = 0, 1, n = 0, ..., M ^RS _sc -1. Also, M ^RS _sc = M ^PUSCH _sc . Where M ^RS _sc is the number of subcarriers for the uplink reference signal and M ^PUSCH _sc is the number of subcarriers for the PUSCH. An orthogonal sequence

Can be determined according to Table 6 described later.

는 시퀀스-그룹 넘버(sequence-group number) u에 의해서 그룹 호핑(group hopping)이 될 수 있으며, 베이스 시퀀스 넘버 v에 의해서 시퀀스 호핑(sequence hopping)이 될 수 있다.The PUSCH DM-RS sequence

May be group hopping by a sequence-group number u and may be sequence hopping by a base sequence number v.

로 주어지며, n_cs는 수학식 2에 의해 정의될 수 있다.The cyclic shift (CS) at slot n _s

, And n _cs can be defined by equation (2).

는 상위 계층에 의해 제공되는 cyclicShift 파라메터(parameter)에 따라 결정될 수 있다. 표 5는 cyclicShift 파라메터에 따라 결정되는

의 예시를 나타낸다.In Equation 2,

May be determined according to a cyclicShift parameter provided by an upper layer. Table 5 summarizes the values determined by the cyclicShift parameter

≪ / RTI >

는 대응되는 PUSCH 전송에 따른 전송 블록을 위한 상향링크 관련 DCI 포맷 내의 DM-RS 순환 쉬프트 필드(cyclic shift field)에 의해서 결정될 수 있다. In Equation 2,

May be determined by a DM-RS cyclic shift field in the uplink-related DCI format for the transport block according to the corresponding PUSCH transmission.

의 예시이다.Table 6 shows the relationship between the DM-RS cyclic shift field

.

은 수학식 3에 의해서 정의될 수 있다.

Can be defined by Equation (3).

가 상위계층(higher layer)으로부터 또는 랜덤 액세스 응답 승인(Random Access Response Grant) 또는 랜덤 액세스 절차에 기반한 전송 블록(transport block)의 재전송에 대응하는 PUSCH 전송으로부터 설정되지 않으면

의 값을 갖고, 이외의 경우에는

의 값을 갖는다.c (i) may have a value of 0 or 1 for each i in a binary pseudorandom sequence. Also, c (i) can be applied cell-specific. The pseudo-random sequence c (i) may be initialized to c _init at the beginning of each radio frame. c _init

Is not set from a higher layer or from a PUSCH transmission corresponding to a retransmission of a transport block based on a random access response grant or a random access procedure

, And in other cases

Lt; / RTI >

The vector of the reference signal can be precoded by Equation (4).

이다. 또한, 공간 다중화(spatial multiplexing)에 대하여 P=2 또는 4이다.In Equation (4), P is the number of antenna ports used for PUSCH transmission. W is a precoding matrix. For PUSCH transmission using a single antenna port, P = 1, W = 1,

to be. P = 2 or 4 for spatial multiplexing.

는 진폭 스케일링 인자(amplitude scaling factor)

와 곱해지고, 자원 블록에

부터 순서대로 매핑된다. 매핑 시에 사용되는 물리 자원 블록의 집합은 대응되는 PUSCH 전송에 사용되는 물리 자원 블록의 집합과 동일하다. 서브프레임 내에서 상기 DM-RS 시퀀스는 먼저 주파수 영역에서 증가하는 방향으로, 그리고 슬롯 번호가 증가하는 방향으로 자원 요소에 매핑될 수 있다. DM-RS 시퀀스는 일반 CP인 경우 4번째 SC-FDMA 심벌(SC-FDMA 심벌 인덱스 3), 확장 CP인 경우 3번째 SC-FDMA 심벌(SC-FDMA 심벌 인덱스 2)에 매핑될 수 있다.For each antenna port used for PUSCH transmission, the DM-RS sequence

Is an amplitude scaling factor < RTI ID = 0.0 >

And the resource block is multiplied

Respectively. The set of physical resource blocks used in mapping is the same as the set of physical resource blocks used in the corresponding PUSCH transmission. Within the subframe, the DM-RS sequence may first be mapped to the resource element in an increasing direction in the frequency domain and in a direction in which the slot number increases. The DM-RS sequence may be mapped to a fourth SC-FDMA symbol (SC-FDMA symbol index 3) for a normal CP and a third SC-FDMA symbol (SC-FDMA symbol index 2) for an extended CP.

Hereinafter, the DM-RS for side link PSSCH / PSCCH / PSDCH / PSBCH in D2D (ProSe) and V2X will be described.

The basics related to the DM-RS in the side link PSSCH / PSCCH / PSDCH / PSBCH in D2D (ProSe) and V2X are as follows. The other contents are the same as the UL DM-RS for the LTE UL PUSCH, but the definitions and application formulas of some parameters are changed as shown in Tables 7 to 9 below. In the Tables 7 to 9, the sidelink transmission mode 1 and the sidelink transmission mode 2 correspond to the base station scheduling mode (eNodeB scheduling mode) and the base station scheduling mode in the PC5-based D2D (ProSe) And may be applied in a UE autonomous scheduling mode. In the Tables 7 to 9, the sidelink transmission mode 3 and the sidelink transmission mode 4 correspond to the eNodeB scheduling mode (eNodeB scheduling mode) and the terminal autonomous scheduling mode (UE autonomous scheduling mode). Specifically, the basics related to the DM-RS in SL (sidelink) PSSCH / PSCCH / PSDCH / PSBCH in D2D (ProSe) and V2X including Tables 7 to 9 are shown as UL DM for the LTE UL PUSCH -RS and other contents are as follows.

The DM-RS associated with the PSSCH, PSCCH, PSDCH, and PSBCH transmissions is basically transmitted according to the above description of the PUSCH DM-RS, but the following exceptions may be applied.

- The parameters in Table 7, Table 8 and Table 9 below are used.

- The term PUSCH is replaced by the terms PSSCH, PSCCH, PSDCH, or PSBCH depending on the physical channel to which the reference signal is associated.

- The set of physical resource blocks used in the mapping process is the same as the corresponding PSSCH / PSCCH / PSDCH / PSBCH transmission.

( L ) = 2 and 5 are used in the first slot of the subframe and symbol index ( l ) = 1 and 2 are used in the second slot of the subframe for the side link transmission modes 3 and 4 on the PSSCH and the PSCCH. 4 is used.

Table 7 below shows the reference signal parameters for the PSSCH, Table 8 shows the reference signal parameters for the PSCCH, and Table 9 shows the reference signal parameters for the PSDCH and PSBCH.

4 is a diagram illustrating DM-RS symbol positions for a PSSCH according to the present disclosure;

The symbol positions where DM-RSs are mapped in one subframe for SL PSSCH in eV2X are symbol positions where DM-RSs are mapped in one subframe for SL PSSCH in V2X as shown in FIG. Can be the same. As shown in FIG. 4, the DM-RSs may be mapped and transmitted in the symbol indexes # 2 and # 5 of the first slot and the symbol indexes # 1 and # 4 of the second slot in the subframe in which the PSSCH is transmitted.

As described above, unlike the conventional PC5-based V2X, in which DM-RS is transmitted on one antenna port corresponding to one layer, a more advanced PC5-based V2X (hereinafter referred to as eV2X) It is necessary to support the DM-RS transmission on a plurality of antenna ports corresponding to a plurality of layers. In the present disclosure, a DM-RS configuration method considering MIMO, such as Tx diversity, a DM-RS setup information provision and acquisition method, a DM-RS transmission and reception method, and an apparatus thereof will be described.

As the transmit diversity technique, techniques such as Space Time Block Coding (STBC), Space Frequency Block Coding (SFBC), and Precision Vector Switching (PVS) in the time domain can be applied, but the present invention is not limited thereto.

A DM-RS configuration scheme for a SL PSSCH in a conventional V2X that transmits a DM-RS on one antenna port corresponding to a layer in an Orthogonal Cover Code (OCC) And a cyclic shift (CS) will be described below.

First, OCC and CS are determined based on n ^X _ID . Specifically, n ^RS _ID or n ^SA _ID corresponds to an identifier (i.e., cell identifier) of a destination, while n ^X _ID is a decimal representation of a CRC (Cyclic Redundancy Check) on a PSCCH transmitted on a subframe such as PSSCH Value. More specifically, when the parity bits p ₀ , p ₁ , p ₂ ,..., P _{L - 1} of the CRC are regarded as binary numbers, the decimal representation of the parity bits is n ^X _ID . For example, if L = 16 and p ₀ = 1, p ₁ = 1, p ₂ = 0, ..., p _{16 -1} = 1, then the decimal representation of the binary number 110 ... 1 ₍₂₎ The value is n ^X _ID .

In the case of OCC, if n ^X _ID is even (i.e., n ^X _ID mod2 = 0) and uses [+1 +1 +1 +1] as the OCC for four symbols to which the DM-RS is mapped in one subframe in which the PSSCH is transmitted.

In the case of OCC, if n ^X _ID is odd (i.e., n ^X _ID mod2 = 1), [+1 -1 +1 -1] is used as OCC for four symbols to which DM-RS is mapped in one subframe in which PSSCH is transmitted.

In case of CS, modular 8 is taken as an integer value obtained by dividing n ^X _ID by 2, and n _{cs, λ} is used as a value. In this case, modular A is an operation corresponding to the remaining value when divided by A.

In the case of using one layer and one antenna port for DM-RS as above, OCC and CS are used for randomization purposes, not for discriminating layers. Randomization is not for layer classification or antenna classification, but for maximizing random interference with DM-RSs transmitted or received by other or different receiving ends.

When considering a plurality of layers for DM-RS, the plurality of layers should be distinguishable from each other. Similarly to the UL PSSCH DM-RS, a method for distinguishing a plurality of DM-RS layers using OCC or CS may be used to distinguish a plurality of layers of SL PSSCH DM-RS of eV2X from each other. However, backward compatibility may be a problem when simply applying the layer classification method in the same manner as the UL PSSCH DM-RS to the SL PSSCH DM-RS.

Specifically, assuming that the method of dividing the layer of the SL PSSCH DM-RS is the same as the method of dividing the layer of the UL PSSCH DM-RS, it is also possible to consider the OCC and the CS in consideration of other ID values such as n ^SA _ID and n ^X _ID It can be defined to use only for layer discrimination. However, in the case of the existing V2X DM-RS, since the OCC and the CS value are determined in association with the n ^X _ID for the purpose of randomization, the layer classification method of the UL PSSCH DM-RS is directly used as the eV2X DM-RS layer classification method It can not be applied.

Thus, in the present disclosure, as in the case of the existing V2X for the SL PSSCH DM-RS of eV2X, it is also possible to maintain the association of OCC and CS values according to n ^X _ID , .

Specifically, a method of defining OCCs and CSs for identifying additional layers while applying the OCC and CS determination schemes defined in the side link transmission modes 3 and 4 of Table 7 will be described below.

That is, according to the disclosure, multiple layers of a DM-RS for eV2X may be classified using different OCC or one or more of each of the other CS, for at least one layer of the plurality of layers, n ^X _{If the ID} is even (i.e., n ^X _ID mod2 = 0) [+1 +1 +1 +1] is used for OCC for four symbols to which DM-RS is mapped in one subframe, and n ^X _ID is an odd number (that is, n ^X _ID mod2 = 1) [+1 -1 +1 -1] is used as the OCC for four symbols to which the DM-RS is mapped in one subframe, CS is a modular value obtained by dividing n ^X _ID by 2, (modular) 8 can be used. Examples of OCC and CS applied to the remaining layer (s) other than the at least one layer among the plurality of layers will be described below.

Example  One

This embodiment relates to a method of dividing up to two layers for SL DM-RS.

Example  1-1

The present embodiment is directed to examples of OCC setting.

As shown in Table 10, in the first layer (? = 0), n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, it uses the same OCC value as existing V2X. In the second layer (λ = 1), n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, each of the two OCC values ([+1 +1 +1 +1], [+1 -1 +1 -1]), which are not used in the first layer (λ = 0) OCC value is used.

As shown in Table 11 and Table 12, in the first layer (? = 0), n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, it uses the same OCC value as existing V2X. In the second layer (λ = 1), four possible OCC values ([+1 +1 +1 +1], [+1 -1 +1 -1], [+1 +1 -1 -1], [+1 -1 -1 +1]) at the first layer _{^{(λ = 0) n X ID}} mod2 = 0 and n be when ^X _ID one of the remaining two OCC values ([+1 -1 +1 -1], [+1 -1 -1 +1]) that was not used when mod2 = 1 is n ^x _ID When mod2 = 0 and n ^X _ID Used for mod2 = 1.

This method increases the complexity because there are four kinds of total possible OCC values compared with the example of Table 10, but n ^X _ID The modulo 2 is used for the same value, and the different OCC values are used. Therefore, the orthogonality can be further increased.

As shown in Table 13 and Table 14, n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, the same OCC value as that of the existing V2X is used for the four symbols on the time axis in the subframe where the PSSCH is transmitted. In addition, to distinguish the layers, the PSSCH uses OCCs of length 2 in every two subcarriers on the frequency axis for the subcarriers in the transmitted symbol.

For example, according to Table 13, [+1 +1] is used as the frequency domain OCC in the first layer (λ = 0) and [+1 -1] is used as the frequency domain OCC in the second layer (λ = Lt; / RTI >

As a further example, according to Table 14, n ^X _ID [+1 +1] is used as the frequency domain OCC in the first layer (λ = 0) and [+1 -1] is used as the frequency domain OCC in the second layer (λ = 1) when mod2 = 0 . Further, n ^X _ID [+1 -1] is used as the frequency domain OCC in the first layer (λ = 0) and [+1 +1] is used as the frequency domain OCC in the second layer (λ = 1) when mod2 = 1 .

In the examples of Tables 13 and 14 above, the complexity increases by applying OCC for each of the time and frequency axes, but the embodiment of Table 10, or the embodiment of Table 11 and Table 12, (For example, a problem that may arise when the V2X terminal is at a very high speed).

Example  1-2

The present embodiment is an example of CS setting.

For existing V2X, use modular 8 as an integer value of n ^X _ID divided by 2 as n _{cs, lambda} value (for example, see Table 7). For eV2X, CS can be configured as shown below in Table 15 for layer discrimination.

As shown in Table 15, a value obtained by taking modular 8 as an integer value obtained by dividing n ^X _ID by 2 can be used for the first layer (? = 0). For the second layer (λ = 1), modulo 8 may be added to the integer value obtained by dividing n ^X _ID by 2, 6 may be added, and modulo 12 may be used for the second layer (λ = 1).

Thus, the CS value for the first layer is equal to the CS value for V2X (see, e.g., Table 7), and the CS value for the second layer is the CS value farthest from the CS value of the first layer Can be applied.

Example  2

The present embodiment relates to a method of dividing up to four layers for SL DM-RS.

Example  2-1

The present embodiment is directed to examples of OCC setting.

As shown in Table 16 and Table 17, in the first layer (? = 0), n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, it uses the same OCC value as existing V2X. In the second layer (λ = 1), the third layer (λ = 2) and the fourth layer (λ = 3), four possible OCC values ([+1 +1 +1 +1] Except for the first layer (λ = 0) of [+1 -1 +1 -1], [+1 +1 -1 -1], and [+1 -1 -1 +1] OCC values, respectively.

At this time, the OCC value applied to each layer is n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, the sequence value of the second OCC and the sequence value of the fourth OCC are opposite to each other in the OCC having a length of 4 (i.e., OCC consisting of 4 sequence values).

For example, n ^X _ID If [+1 +1 +1 +1] is used for OCC when mod2 = 0, n ^X _ID When mod2 = 1, [+1 -1 +1 -1] is used as the OCC. For another example, n ^X _ID If [+1 -1 +1 -1] is used as OCC when mod2 = 0, n ^X _ID When mod2 = 1, [+1 +1 +1 +1] is used as the OCC. For another example, n ^X _ID If [+1 +1 -1 -1] is written to OCC when mod2 = 0, then n ^X _ID When mod2 = 1, [+1 -1 -1 +1] is used as the OCC. For another example, n ^X _ID If [+1 -1 -1 +1] is used for OCC when mod2 = 0, n ^X _ID When mod2 = 1, [+1 +1 -1 -1] is used as the OCC.

As shown in Table 18 and Table 19, n ^X _ID When mod2 = 0 and n ^X _ID When mod2 = 1, the same OCC value as that of the existing V2X is used for the four symbols on the time axis in the subframe where the PSSCH is transmitted. In addition, to distinguish the layers, the PSSCH uses a 4-length OCC on the frequency axis for every 4 subcarriers for the subcarriers in the transmitted symbol.

For example, according to Table 18, [+1 +1 +1 +1] is used as the frequency domain OCC in the first layer (λ = 0) and [+ +1 +1 +1] is used as the frequency domain OCC in the second layer 1 +1 +1 -1] is used in the third layer (λ = 2), [+1 +1 -1 -1] is used in the frequency domain OCC in the third layer Use [+1 -1 -1 +1] as the OCC.

In another example according to Table 13, n ^X _ID [+1 +1 +1 -1] is used for the first layer (λ = 0) and [+1 -1 +1 -1] is used for the second layer (λ = 1) when mod2 = 0 , +1 +1 -1 -1 is used for the third layer (λ = 2), and [+1 -1 -1 +1] is used for the fourth layer (λ = 3). On the other hand, n ^X _ID [+1 -1 +1 -1] is used for the first layer (λ = 0) and [+1 +1 +1 +1] is used for the second layer (λ = 1) when mod2 = 1 , +1 +1 -1 +1 is used for the third layer (λ = 2), and [+1 +1 -1 -1] is used for the fourth layer (λ = 3).

In the examples of Tables 18 and 19 above, the complexity increases by applying OCC for each of the time and frequency axes, but the embodiments of Tables 16 and 17 are limited to problems caused by applying OCC only on a time axis , A problem that may occur when the V2X terminal has a very high speed).

Example  2-2

The present embodiment is an example of CS setting.

For existing V2X, use modular 8 as an integer value of n ^X _ID divided by 2 as n _{cs , lambda} value (for example, see Table 7). For eV2X, CS can be configured as shown in Table 20 below.

As shown in Table 20, a value obtained by taking modular 8 as an integer value obtained by dividing n ^X _ID by 2 can be used for the first layer (? = 0). For the second layer (λ = 1), modulo 8 may be added to the integer value obtained by dividing n ^X _ID by 2, 6 may be added, and modulo 12 may be used for the second layer (λ = 1). For the third layer (λ = 2), modulo 8 may be added to the integer value obtained by dividing n ^X _ID by 2, and 3 may be added to the value obtained by modular 12. For the fourth layer (λ = 3), we can add modulo 8 to the integer value of n ^X _ID divided by 2, add 9 to it, and use modular 12 as its value.

Thus, the CS value for the first layer is equal to the CS value for V2X (see, e.g., Table 7), and the CS value for the second layer is the CS value farthest from the CS value of the first layer , The CS value for the third layer is applied to the CS value that is the farthest from the CS value of the first and second layers, and the CS value for the fourth layer is applied to the CS of the first, second and third layers The CS value farthest from the value can be applied.

In the examples of the present disclosure described above, the mapping from layer to antenna port (i. E., Precoding) may follow the mapping rules defined below.

The reference signal vectors may be precoded by Equation (5) below.

는 PSSCH 전송을 위하여 사용되는 레이어의 개수이다. W는 프리코딩 행렬이다. 단일 안테나 포트를 사용하는 PSSCH 전송에 있어서, P=1이고, W=1이고,

이다. 공간 다중화의 경우에, P=2 또는 P=4이다. In Equation (5), P is the number of antenna ports used for PSSCH transmission.

Is the number of layers used for PSSCH transmission. W is a precoding matrix. For PSSCH transmission using a single antenna port, P = 1, W = 1,

to be. In the case of spatial multiplexing, P = 2 or P = 4.

Hereinafter, a method of indicating a plurality of layers according to the present disclosure will be described.

5 is a diagram for explaining DCI and SCI in a BS resource scheduling mode according to the present disclosure;

As described above, in the base station resource scheduling mode (eNodeB resource scheduling mode or mode 3), the subframe in which the SA is transmitted is 4 ms after the subframe in which the base station (eNodeB) transmits DCI (Downlink Control Information) Frame) is the first subframe included in the set of resource candidates that can be used for V2X on a V2X carrier (carrier or band).

At this time, the information necessary for the V2X (or direct link) transmission terminal (UE A in FIG. 5) to transmit the SA and data (data) to the V2X Can instruct UE A through DCI. For example, the DCI may include information as shown in Table 21.

Information on a resource block, which is a frequency axis resource used by the UE A to transmit the SA to the UE B in the subframe in which the SA is transmitted, is defined as " CIF " And a " Lowest index of sub-channel allocation " field corresponding to the lowest index of sub-channel assignment.

In the base station resource scheduling mode (eNodeB resource scheduling mode or mode 3), the DCI includes control information (SA (Scheduling Assignment)) for data transmission from the UE A to the UE B, (content). At this time, the content related to the SCI indicated by the DCI includes the " Time gap between transmission and retransmission " corresponding to the time gap between transmission and retransmission, A " frequency resource of initial and last transmission " field indicating a frequency resource of the transmission.

6 is a view for explaining SCI in a terminal autonomic resource selection mode according to the present invention.

In the UE autonomous resource selection mode (mode 4), the UE can determine the subframe to be transmitted by itself in the SA pool (specifically, the subframe pool for the SA) by sensing. A resource block, which is a frequency axis resource used for transmitting an SA in a subframe in which the SA is transmitted, can also determine itself in an SA pool (specifically, a resource block pool for an SA). Therefore, unlike the base station resource scheduling mode (eNodeB resource scheduling mode or mode 3), the CIF and the Lowest Index of sub-channel allocation field are not received from the base station via the DCI, .

In the UE autonomous resource selection mode or mode 4, content related to SCI (Sidelink Control Information) is transmitted as information (SA (Scheduling Assignment)) necessary for the UE to transmit data in V2X communication. The terminal itself is also determined. Therefore, unlike the base station resource scheduling mode (eNodeB resource scheduling mode or mode 3), a "Time gap between transmission and retransmission" field and a "Frequency resource of initial and last transmission" The terminal itself can decide not to be provided.

That is, the SCI (Sidelink Control Information) corresponding to the information (SA (Scheduling Assignment)) required for the UE to transmit data is transmitted in the base station resource scheduling mode (eNodeB resource scheduling mode or mode 3) , And the terminal autonomous resource selection mode (mode 4) is determined by the terminal itself.

Meanwhile, both the UE resource scheduling mode (eNodeB resource scheduling mode or mode 3) and the UE autonomous resource selection mode (mode 4) (SC) corresponding to control information (Scheduling Assignment) is required to decode the data transmitted from the UE A and the UE A transmitting the data transmits the control information SA (Scheduling Assignment) To the UE (UE B) receiving the data. For example, the SCI may include information as shown in Table 22 below.

Hereinafter, exemplary information included in the DCI of Table 21 and the SCI of Table 22 will be described in detail.

As described above, information on a resource block, which is a frequency axis resource used for SA transmission in a base station resource scheduling mode (mode 3), can be indicated in the DCI, CIF " and " Lowest index of sub-channel allocation " fields in Table 21.

The " CIF " field may have a size of 3 bits and indicates a carrier (carrier, or band) used for V2X. For example, if up to five carriers can be set for the UE, the indicator for distinguishing each carrier is 3 bits (i.e. ceil (log2 (5)) = 3, where ceil (x) Or the like), and the indicator can be used to indicate which of the five carriers is used for SA transmission.

The "lowest index of sub-channel allocation" field is used to transmit a resource block on a carrier (carrier or band) used for the V2X in the subframe transmitting the SA. And whether or not to use it.

The "Lowest index of sub-channel allocation" field is used for transmission of data associated with the SA, among a total of K sub-channels having indices of 0 to K-1 And may indicate a sub-channel having the lowest index among the sub-channels. This requires a bit of ceil (log2 (K)). The value of K is variable depending on the size of the system bandwidth, and may have a value of, for example, a maximum of 20. Accordingly, a minimum of 0 bits and a maximum of 5 bits are required for the " Lowest index of sub-channel allocation " field.

For example, there are a total of six sub-channels having an index value of 0 to an index value of 5, and a total of four sub-channels corresponding to an index value of 5 from the index values of 2, ), The value indicated by the " Lowest index of sub-channel allocation " may be an index value of 2. If the PSSCH is allocated to the PSSCH and the PSSCH is used for transmission of the data associated with the SA, (6)) = 3 bits are required.

In this case, the PSCCH for transmitting the SA includes a sub-channel indicated by the " Lowest index of sub-channel allocation " when the PSCCH for transmitting the SA and the PSSCH for transmitting data are adjacent to each other on the frequency axis. channel < RTI ID = 0.0 > (RB) < / RTI > Alternatively, when the PSCCH for transmitting the SA and the PSSCH for transmitting data are not adjacent to each other on the frequency axis, a one-to-one correspondence to a sub-channel indicated by the " Lowest index of sub- And is allocated in the RB corresponding to the day.

Assume, for example, that the value indicated by the " Lowest index of sub-channel allocation " In this case, if the PSCCH for transmitting the SA and the PSSCH for transmitting data are adjacent to each other on the frequency axis, SA is allocated to the RB having the lowest RB index in the sub-channel corresponding to the index value 2 A PSCCH for transmission can be allocated. Alternatively, if the PSCCH for transmitting the SA and the PSSCH for transmitting the data are not adjacent to each other on the frequency axis, the SA is transmitted to the RB corresponding to the one-to-one correspondence to the sub-channel corresponding to the index value 2 A PSCCH for transmission can be allocated.

Next, a " Time gap between transmission and retransmission " field and a " Frequency resource of initial and last transmission " field for indicating a resource used for the PSSCH for transmitting data among the SA contents of Table 21, A field may be included in the DCI in a base station resource scheduling mode (mode 3). In addition, the "Time gap between transmission and retransmission" field and the "Frequency resource of initial and last transmission" field in Table 22 indicate DCI in the base station resource scheduling mode (mode 3) The UE may directly determine the value to be included in the SCI, but in the case of the UE autonomous resource selection mode or mode 4, the UE may be determined according to the resource selected based on the sensing.

The "Time gap between transmission and retransmission" field indicates a gap between the subframe in which the data of the TB unit associated with the SA is firstly transmitted and the data of the TB unit associated with the SA are retransmitted ). This value may be a value from 0 to 15. If it is 0, it indicates that there is no retransmission of the TB transmitted through the SA including the SCI. If the retransmission is 1 to 15, And the first transmitted TB is retransmitted after 1 to 15 subframes each.

Next, the " frequency resource of initial and last transmission " field indicates which RBs are transmitted on the frequency axis in the sub-frame in which the TB data is first transmitted and in the retransmitted sub- do. In particular, the "frequency resource of initial and last transmission" field indicates the number of sub-channels used at the initial transmission of data (the number of sub-channels used at retransmission of data is the initial transmission Channel), as well as information on the lowest index among the sub-channels used in the retransmission of data (data).

More specifically, when the TB transmitted through the SA including the SCI is transmitted for the first time, the lowest index among the sub-channels used for the transmission is the eNodeB resource scheduling mode , Or mode 3) is indicated by a "Lowest index of sub-channel allocation" field included in the DCI. In case of the UE autonomous resource selection mode or mode 4, . Herein, information indicating how many sub-channels are to be transmitted may be included in the " frequency resource of initial and last transmission " field.

In addition, when a TB instructed and transmitted through an SA including the SCI is retransmitted, the lowest index among the sub-channels used for the retransmission is the " frequency resource of initial and last transmission " field. The number of sub-channels to be transmitted at the time of TB retransmission is indicated by a " frequency resource of initial and last transmission " field, and the number of sub- As many sub-channels as the number are used.

Assuming K sub-channels for the "frequency resource of initial and last transmission" field, a total ceil (log2 (K * (K + 1) / 2) is required. For example, K is a maximum of 20, which requires a minimum of 0 bits to a maximum of 8 bits.

Of the other fields included in the SCI of Table 22, " Priority " can indicate the priority of data (data) of TB units to be transmitted.

The " Resource reservation " field is a parameter used to indicate a resource reserved in the UE autonomous resource selection mode (mode 4) or j∈ {0,1,2, ..., 10} value.

The " Modulation and Coding Scheme (MCS) " field can indicate a modulation scheme and a coding scheme of data of a TB unit to be transmitted.

The " Retransmission index " field indicates the retransmission of data in units of TB.

A " Cyclic Redundancy Check (CRC) " field may be added to the SCI for error detection and / or distinction from other SCIs in transmission of the SCI.

A method of indicating a layer to be used by the UE via DCI and / or SCI based on the DCI and SCI formats described with reference to Tables 21 and 22 will be described below.

According to the present disclosure, a layer indication field is configured by using bits that are left unused among a total of 32 bits of information bits constituting the SCI, Can be indicated.

The layer indication field may be defined as an N-bit size.

If the maximum number of layers considered is two, N = 1 bit may be used. For example, if the bit value is 0, it indicates the first layer (λ = 0) and if the bit value is 1, it indicates the second layer (λ = 1).

N = 2 bits can be used if the maximum number of layers considered is four. For example, if the bit value is 0 (= 00), the first layer (λ = 0) and the bit value is 1 (= 01) A third layer (? = 2)) and a bit value of 3 (= 11) can indicate a fourth layer (? = 3).

Table 23 below shows an example of an SCI to which an N-bit size layer indication field is added. For example, SCI Format 1 may be used for scheduling of the PSSCH, and the information in Table 23 may be transmitted using SCI Format 1.

In the example of Table 23, the reserved information bits can be added until the size of the SCI format 1 becomes 32 bits, and thus added bits can be set to a value of zero.

In case of the side link mode 4 (terminal autonomous scheduling mode), the SCI information is determined by the side link transmitting terminal (V2X transmitting terminal) itself, whereas in the side link mode 3 (base station scheduling mode) To the terminal (V2X transmitting terminal). Accordingly, the 1 or 2-bit layer indication field may be additionally included in the DCI and transmitted.

An example of how to add a layer indication field to the DCI is described with reference to Table 24 below.

Table 24 exemplarily shows the information transmitted through the DCI format 5A.

In the example of Table 24, in all cases, a layer indication field of the N bits can be newly added to the DCI and transmitted. For example, an N-bit size layer indication field may be added using the reserved bits of the DCI.

A further example of how to add a layer indication field to the DCI is described with reference to Table 25 below.

In the example of Table 25, information transmitted through the DCI format 5A is exemplarily shown.

In the example of Table 25, when the CRC of the DCI is not scrambled with the SL-SPS-V-RNTI, the N-bit size layer indication field may be added. For example, an N-bit size layer indication field may be added using the reserved bits of the DCI.

Here, when the CRC of the DCI is not scrambled with the SL-SPS-V-RNTI, the CRC of the DCI may be scrambled with the SL-V-RNTI.

In the example of Table 25, it may mean that MIMO is not supported in the Semi Persistent Scheduling (SPS) situation (that is, the non-active scheduling situation, not the active scheduling situation).

Therefore, in the SPS situation, a total of 4 bits (i.e., the "SL SPS configuration index" field and the "Activation / Release indication" field) are added to the DCI, and when not in the SPS situation, N bits can be added to the DCI. Therefore, when the situation is not SPS, MIMO is considered, but the number of DCI bits can be used more efficiently.

Hereinafter, specific examples of N-bit size layer indication fields will be described.

For example, in defining the SCI and / or the DCI to which the layer indication field is added, the MIMO operation may or may not be distinguished.

Specifically, the layer indication in the side link receiving terminal (or the V2X receiving terminal) can be transparently provided to the MIMO operation. That is, the UE receiving the SCI and / or DCI only needs to perform transmission according to the indicated layer, and may not know whether or not the MIMO transmission is performed.

In this case, the size N of the layer indication field is defined as N = 1 when a maximum of two layers are supported, and the size N = 2 of the layer indication field when a maximum of four layers are supported.

As a further example, in defining the SCI and / or DCI to which the layer indication field is added, it is possible to distinguish whether or not the MIMO operation is performed.

Specifically, the layer indication in the side link receiving terminal (or the V2X receiving terminal) may be provided in a different manner depending on whether the MIMO operation is performed or not.

For example, the DCI or SCI format used when the MIMO operation is applied and the DCI or SCI format used when the MIMO operation is not applied are the same, but the upper layer signaling (e.g., RRC signaling) Whether or not the MIMO operation is performed can be indicated in advance.

In this case, the size N of the layer indication field is defined as N = 0 or 1 when a maximum of two layers are supported, and the size N = 0 or 2 of the layer indication field when a maximum of four layers are supported .

As a further example, the DCI or SCI format used when the MIMO operation is applied and the DCI or SCI format used when the MIMO operation is not applied may be defined in different formats.

In this case, when a maximum of two layers are supported, when the MIMO operation is not applied, the DCI (or SCI) format #A not including the layer indication field (i.e., N = 0) is used and the MIMO operation is applied DCI (or SCI) format #B containing the layer indication field (i.e., N = 1) may be used. DCI (or SCI) format #A that does not include a layer indication field (i.e., N = 0) is used when a MIMO operation is not applied when a maximum of four layers are supported, DCI (or SCI) format #B containing the indication field (i.e., N = 2) may be used.

7 is a diagram for explaining an eV2X DM-RS transmission / reception method according to the present disclosure.

In step S710, the first terminal (e.g., the V2X transmitting terminal) may generate setting information for the DM-RS to be transmitted to the second terminal (e.g., V2X receiving terminal). The DM-RS setting information may include information on a plurality of layers. More specifically, the DM-RS setting information may include a layer indication field.

The layer indication field may include information indicating one or more of OCC or CS values applied to a plurality of layers. In addition, the DM-RS setup information may be generated based on information (e.g., step S705) included in the DCI provided from the base station to the first terminal (for example, in case of the side link transmission mode 3) , Or the first terminal may autonomously generate (e.g., in case of side link transmission mode 4).

In step S720, the first terminal may transmit control information (e.g., SCI) including the DM-RS configuration information to the second terminal.

In step S730, the first terminal may map the DM-RS on the resource to which data (e.g., PSSCH) to be transmitted to the second terminal is mapped and transmit the DM-RS to the second terminal. Here, the OCC and / or the CS applied in the DM-RS mapping may follow the DM-RS setting information value provided to the second UE in step S720.

In step S740, the second terminal can correctly distinguish the layer of the DM-RS received from the first terminal based on the DM-RS setting information provided in step S720, and accordingly, the data (PSSCH) Demodulation.

8 is a diagram showing a configuration of a base station apparatus according to the present disclosure.

The base station apparatus 800 may include a processor 810, an antenna unit 820, a transceiver 830, and a memory 840.

The processor 810 performs baseband-related signal processing, and may include an upper layer processing unit 811 and a physical layer processing unit 815. The upper layer processing unit 811 can process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit 815 can process the operation of the physical (PHY) layer (e.g., uplink received signal processing, downlink transmission signal processing). In addition to performing baseband related signal processing, the processor 810 may also control operation of the entire base station apparatus 800. [

The antenna unit 820 may include one or more physical antennas, and may support Multiple Input Multiple Output (MIMO) transmission and reception when the antenna unit 820 includes a plurality of antennas. Transceiver 830 may include a radio frequency (RF) transmitter and an RF receiver. The memory 840 may store computationally processed information of the processor 810, software related to the operation of the base station device 800, an operating system, applications, and the like, and may include components such as buffers.

The processor 810 of the base station device 800 may be configured to implement base station operation in the embodiments described herein.

For example, the upper layer processing unit 811 of the processor 810 of the base station apparatus 800 may include a DM-RS setting generating unit 812.

The DM-RS configuration generator 812 generates configuration information (e.g., a DM-RS layer indication field) for the DM-RS transmitted for demodulation of a physical channel to be transmitted on the side link by the first terminal to the second terminal, Can be determined.

The physical layer processing unit 815 of the processor 810 of the base station apparatus 800 may include a DM-RS setting information transmitting unit 816.

The DM-RS setup information transmitter includes downlink control information (DCI) including DM-RS setup information (i.e., setup information for the DM-RS to be transmitted to the second terminal) allocated to the first terminal UE1, And transmit it through the transceiver 830. [

9 is a diagram showing a configuration of a first terminal device according to the present disclosure.

The first terminal device 900 may include a processor 910, an antenna unit 920, a transceiver 930, and a memory 940. [

The processor 910 performs baseband-related signal processing, and may include an upper layer processing unit 911 and a physical layer processing unit 915. The upper layer processing unit 911 may process the operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 915 can process the operation of the PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing, side link transmission signal processing, and the like). The processor 910 may control the operation of the first terminal device 900 in addition to performing baseband related signal processing.

The antenna unit 920 may include one or more physical antennas and may support MIMO transmission and reception when the antenna unit 920 includes a plurality of antennas. The transceiver 930 may include an RF transmitter and an RF receiver. The memory 940 may store information processed by the processor 910, software related to the operation of the first terminal device 900, an operating system, applications, and the like, and may include components such as buffers.

The processor 910 of the first terminal device 900 may be configured to implement the operation of the first terminal or the SL transmission terminal in the embodiments described in the present invention.

For example, the upper layer processing unit 911 of the processor 910 of the first terminal device 900 may include a DM-RS setting generating unit 912.

The DM-RS setting generated by the first terminal device in the DM-RS setting generator 912 may be determined according to the DM-RS setting provided from the base station through the DCI, or may be determined autonomously by the first terminal device It is possible. Here, the DM-RS setting corresponds to the setting for the DM-RS to be transmitted on the side link from the first terminal to the first terminal, specifically, information about a plurality of layers (for example, layer indication field) .

The physical layer processing unit 915 of the processor 910 of the first terminal device 900 includes a DM-RS setting information transmitting unit 916, a DM-RS transmitting unit 917, and a physical channel transmitting unit 918 .

The DM-RS setting information transmitting unit 916 configures the side link control information (SCI) including the DM-RS setting to be transmitted to the second terminal, and transmits the side link control information (SCI) through the transceiver 930.

The DM-RS transmitter 917 may map the DM-RS on the physical resource and transmit the DM-RS through the transceiver 930 based on the DM-RS setting to be transmitted to the second terminal.

The physical channel transmitter 917 may map a physical channel (e.g., a side link data channel) together with the DM-RS transmitted to the second terminal on physical resources, and transmit the physical channel through the transceiver 930.

10 is a diagram showing a configuration of a second terminal apparatus according to the present disclosure.

The second terminal apparatus 1000 may include a processor 1010, an antenna unit 1020, a transceiver 1030, and a memory 1040.

The processor 1010 performs baseband related signal processing and may include an upper layer processing unit 1011 and a physical layer processing unit 1015. [ The upper layer processing unit 1011 can process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1015 can process the operation of the PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing, side link reception signal processing, and the like). The processor 1010 may control the operation of the second terminal device 1000 in addition to performing the baseband-related signal processing.

The antenna unit 1020 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna includes a plurality of antennas. Transceiver 1030 may include an RF transmitter and an RF receiver. The memory 1040 may store information processed by the processor 1010, software related to the operation of the second terminal device 1000, an operating system, applications, and the like, and may include components such as buffers.

The processor 1010 of the second terminal device 1000 may be configured to implement the operation of the second terminal or the SL terminal in the embodiments described in the present invention.

The physical layer processing unit 1015 of the processor 1010 of the second terminal device 1000 may include a DM-RS setting information receiving unit 1016, a DM-RS receiving unit 1017, and a physical channel receiving unit 1018.

The DM-RS setting information receiving unit 1016 can confirm the DM-RS setting allocated to the DM-RS setting information receiving unit 1016 based on the DM-RS setting information provided through the SCI from the first terminal. Specifically, based on the layer indication field included in the SCI, the layer can be classified according to the OCC and / or CS of the DM-RS layer allocated to the layer.

The DM-RS receiving unit 1017 can receive the DM-RS transmitted thereto through the transceiver 1030 based on the DM-RS setting confirmed through the DM-RS setting information receiving unit 1016. [

The physical channel receiving unit 1018 can receive the physical channel transmitted together with the DM-RS through the transceiver 1030. The DM-

The physical layer processing unit 1015 transfers the received DM-RS and the physical channel to the upper layer processing unit 1011, and attempts physical channel demodulation based on the channel estimated using the DM-RS.

In the operation of the base station apparatus 800, the first terminal apparatus 900, and the second terminal apparatus 1000, the same elements as those of the exemplary embodiments of the present invention can be applied, and redundant description will be omitted.

Although the exemplary methods of this disclosure are represented by a series of acts for clarity of explanation, they are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In order to implement the method according to the present disclosure, the illustrative steps may additionally include other steps, include the remaining steps except for some steps, or may include additional steps other than some steps.

The various embodiments of the disclosure are not intended to be all-inclusive and are intended to be illustrative of the typical aspects of the disclosure, and the features described in the various embodiments may be applied independently or in a combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, 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 A general processor, a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure is to be accorded the broadest interpretation as understanding of the principles of the invention, as well as software or machine-executable instructions (e.g., operating system, applications, firmware, Instructions, and the like are stored and are non-transitory computer-readable medium executable on the device or computer.

Claims (1)

A method for a first terminal to transmit a side link demodulation reference signal (DM-RS) in a wireless communication system,
Transmitting configuration information for a DM-RS supporting a plurality of layers to the second terminal; And
And transmitting the DM-RS and the physical channel to the second terminal based on the DM-RS setting information,
Wherein the DM-RS setting information includes layer indication information for one or more layers of the plurality of layers, and determines an orthogonal cover code (OCC) for each of the one or more layers based on the layer indication information. RS transmission method.

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