KR102335764B1 - Apparatus and method for tarnsmitting d2d data based on resource pattern - Google Patents

Abstract

A method and apparatus for transmitting D2D data based on a resource pattern are disclosed. The method for transmitting D2D data based on the resource pattern includes determining a selected D2D data transmission resource for transmitting one D2D data transmission unit, and transmitting one D2D data transmission unit through the selected D2D data transmission resource. It may include, but the selected D2D data transmission resource is indicated based on the change pattern of the basic pattern, and the change pattern is the number of unit D2D data transmission resources for transmission of one D2D data transmission unit and the number of selected unit D2D data transmission resources. It may be determined based on information on the number and information on the number of unit D2D data transmission resources of the basic pattern and the number of selected unit D2D data transmission resources.

Description

Method and apparatus for transmitting D2D data based on resource pattern {APPARATUS AND METHOD FOR TARNSMITTING D2D DATA BASED ON RESOURCE PATTERN}

The present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting device to device (D2D) data based on a resource pattern.

The amount of data transmitted through wireless communication is increasing. However, since the frequency resources that service providers can provide are limited and already reaching saturation, mobile communication service providers are constantly developing technologies for discovering new frequencies and improving frequency usage efficiency. D2D (Device-to-Device) communication technology is one of the technologies being actively researched recently as a way to alleviate the shortage of frequency resources and to create new mobile communication services.

D2D communication refers to a technology in which terminals that are geographically close to each other directly exchange information without going through an infrastructure such as a base station. D2D communication technology has been developed and standardized mainly in unlicensed bands such as Wi-Fi Direct and Bluetooth, which have already been commercialized in the early days. However, in recent years, technology development and standardization for supporting D2D communication in a cellular system using a licensed band is in progress. Representatively, the 3rd Generation Partnership Project (3GPP), a mobile communication standardization organization, is actively working on standardizing a D2D communication technology called Proximity-based Services (ProSe) as one of the new technologies included in Long Term Evolution (LTE) release 12.

An object of the present invention is to provide a method for transmitting D2D data based on a resource pattern.

Another technical object of the present invention is to provide an apparatus for transmitting D2D data based on a resource pattern.

In order to achieve the above object of the present invention, a method for transmitting D2D data based on a resource pattern according to an aspect of the present invention includes the steps of determining a selected D2D data transmission resource for transmitting one D2D data transmission unit; The method may include transmitting the one D2D data transmission unit through a selected D2D data transmission resource, wherein the selected D2D data transmission resource is indicated based on a change pattern of a basic pattern, and the change pattern is the one D2D data transmission resource. Information on the number of unit D2D data transmission resources and the number of selected unit D2D data transmission resources for data transmission unit transmission, the number of unit D2D data transmission resources of the basic pattern, and information on the number of selected unit D2D data transmission resources can be determined based on

A terminal for determining a D2D data transmission resource in device to device (D2D) communication according to another aspect of the present invention for achieving the above object of the present invention includes a communication unit implemented to transmit and receive a radio signal, and the communication unit and optional A processor connected to However, the selected D2D data transmission resource is indicated based on a change pattern of a basic pattern, and the change pattern is the number of unit D2D data transmission resources for transmission of the one D2D data transmission unit and the selected unit D2D data transmission resource. It may be determined based on information on the number of , the number of unit D2D data transmission resources of the basic pattern, and information on the number of selected unit D2D data transmission resources.

Based on the allocation of D2D data resources used for D2D communication, collision or interference between terminals due to transmission and/or reception of D2D data may be minimized. Accordingly, the performance of D2D data transmission may be improved.

1 is a conceptual diagram showing the structure of a radio frame to which the present invention is applied.
2 is a conceptual diagram illustrating the structure of a radio frame to which the present invention is applied.
3 is a conceptual diagram illustrating D2D communication.
4 is a conceptual diagram illustrating a D2D communication resource according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a D2D communication resource according to an embodiment of the present invention.
6 discloses a method of determining a selected D2D data transmission resource according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a T-RPT according to an embodiment of the present invention.
8 is a table showing a basic pattern according to an embodiment of the present invention.
9 is a table showing a basic pattern according to an embodiment of the present invention.
10 is a table showing a basic pattern according to an embodiment of the present invention.
11 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern according to an embodiment of the present invention.
12 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern according to an embodiment of the present invention.
13 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern in an embodiment of the present invention.
14 is a flowchart illustrating an operation of transmitting traffic data of a terminal according to an embodiment of the present invention.
15 is a block diagram illustrating a base station and a terminal according to an embodiment of the present invention.

* Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the embodiments of the present specification, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

1 is a conceptual diagram showing the structure of a radio frame to which the present invention is applied.

1 discloses a radio frame structure for device-to-device (D2D) communication based on frequency division duplexing (FDD).

Referring to FIG. 1 , a radio frame for FDD includes 10 subframes. One subframe includes two slots. A time corresponding to one subframe is referred to as a transmission time interval (TTI). The length of one subframe may be 1 ms, and the length of one slot may be 0.5 ms.

One slot may include a plurality of symbols in the time domain. Each of the plurality of symbols may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol according to an access scheme.

The number of symbols included in one slot may vary according to the length of a cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 7 symbols, and in the case of an extended CP, one slot may include 6 symbols.

In the case of FDD, if two carrier frequencies exist, each of the two carrier frequencies may be used for uplink transmission and downlink transmission. Hereinafter, in D2D communication, uplink transmission means data transmission from a terminal to another terminal or a base station based on one D2D terminal (hereinafter referred to as a terminal) supporting a specific D2D communication, and uplink data is transmitted from the terminal to another terminal or It may mean data transmitted to the base station. In addition, downlink transmission may mean data transmission from another terminal or base station to the terminal based on the terminal, and downlink data may mean data transmitted from another terminal or base station to the terminal based on the terminal.

In the case of duplexing FDD, downlink transmission and uplink transmission may be simultaneously performed within a cell. Although uplink transmission and downlink transmission are simultaneously possible in one cell in FDD, downlink transmission and uplink transmission are simultaneously performed in a cell depending on whether the UE supports full-duplex or half-duplex. may not be performed. For example, when the terminal operates in full-duplex, the terminal may simultaneously receive downlink data and transmit uplink data. However, when the terminal operates in half-duplex, the terminal cannot simultaneously perform a downlink data reception operation and an uplink data reception operation.

In D2D communication, when the terminal operates in full-duplex, the terminal may simultaneously receive downlink data from another terminal or base station and transmit uplink data to another terminal or base station. However, when the terminal operates in half-duplex, the operation of receiving downlink data from another terminal or base station and the operation of transmitting uplink data to another terminal or base station cannot be simultaneously performed.

2 is a conceptual diagram illustrating the structure of a radio frame to which the present invention is applied.

In FIG. 2, a radio frame structure for D2D communication based on time division duplexing (TDD) is disclosed.

Referring to FIG. 2 , the radio frame structure for TDD includes 10 subframes, similar to the radio frame structure for FDD. One subframe includes two slots. Although the basic radio frame structure is similar, a specific subframe among subframes included in a radio frame for TDD may be defined as a special subframe. The special subframe may be a time resource for switching between uplink transmission and downlink reception. The special subframe may include a downlink part (DwPTS), a guard period (GP), and an uplink part (UpPTS).

In TDD, there is only one carrier frequency, and thus, uplink transmission and downlink transmission can be temporally separated based on one cell. For example, a terminal performing D2D communication transmits uplink data to another terminal or base station in time resources for uplink transmission on one carrier frequency, and downlinks from another terminal or base station in time resources for downlink transmission. Link data can be received.

3 is a conceptual diagram illustrating D2D communication.

Hereinafter, it is assumed that a terminal posted in an embodiment of the present invention supports D2D communication.

In D2D communication, data may be directly transmitted or received between terminals. Accordingly, when terminals in close proximity perform D2D communication in a cellular system, the load of the base station may be distributed. In addition, when the terminals perform D2D communication, since the terminal transmits data over a relatively short distance, consumption of transmission power and transmission latency of the terminal may be reduced. In addition to this, from the viewpoint of the entire system, since the existing cellular-based communication and the D2D communication use the same resource, frequency utilization efficiency may be improved.

D2D communication may be divided into a communication method of a terminal located within network coverage (base station coverage) and a communication method of a terminal located outside network coverage (base station coverage).

Referring to FIG. 3 , communication between a first terminal 310 located in a first cell and a second terminal 320 located in a second cell may be D2D communication between a terminal located within network coverage and another terminal located within network coverage. have. Communication between the fourth terminal 340 located in the first cluster and the fifth terminal 350 located in the first cluster may be D2D communication between terminals located outside the network coverage.

In D2D communication, a discovery procedure for performing discovery for communication between terminals may be performed. After the discovery procedure is performed, a direct communication procedure for transmitting and receiving control data and/or traffic data between terminals may be performed.

D2D communication can be used for various purposes. For example, D2D communication within network coverage may be used for public safety (public safety) and purposes other than public safety (commercial purposes, etc.). D2D communication outside of network coverage may be used only for public safety.

D2D communication located within the base station coverage may be performed based on the base station. For example, the base station 300 may transmit D2D resource allocation information to the first terminal 310 located within the base station coverage. The D2D resource allocation information may include allocation information for D2D communication resources for D2D communication between the first terminal 310 and another terminal (eg, the second terminal 320 ). Upon receiving the D2D resource allocation information from the base station, the first terminal 310 may transmit the D2D resource allocation information to the second terminal 320 out of coverage of the base station. The second terminal 320 may be a terminal located outside the coverage of the base station from the viewpoint of the base station 300 of the first cell. The first terminal 310 and the second terminal 320 may perform D2D communication based on D2D resource allocation information. Specifically, the second terminal 320 may obtain information about the D2D communication resource of the first terminal 310 . The second terminal 320 may receive traffic data and/or control data transmitted from the first terminal 310 through a resource indicated by the information on the D2D communication resource of the first terminal 310 .

In D2D communication, a terminal may transmit control data to another terminal. A separate channel (eg, a physical uplink control channel (PUCCH)) for transmitting control data in D2D communication may not be defined. When a control channel is not defined in D2D communication, the UE may use various methods to transmit control data for D2D communication. In D2D communication, control data may also be expressed in terms of scheduling assignment (SA) information.

In the first mode communication, the base station or the relay node may schedule accurate information on the D2D communication resource of the terminal based on the D2D resource pool. Specifically, in the first mode communication, the base station may transmit information on D2D communication resources for control data (or SA data) and D2D communication resources for traffic data to the terminal.

In the second mode communication, the UE may directly schedule the D2D communication resource based on the D2D resource pool. Specifically, in the second mode communication, information on a D2D communication resource for control data and information on a D2D communication resource for traffic data may be selected from the D2D resource pool by the terminal. The D2D resource pool may be pre-configured or allocated semi-statically.

The first mode communication or the second mode communication may be used as the D2D communication within the network coverage, and the second mode communication may be used as the D2D communication outside the network coverage.

A D2D communication resource for transmitting or receiving control data or traffic data for D2D communication may largely include a D2D SA resource for transmitting control data and a D2D data resource for transmitting traffic data.

The D2D data resource may be a resource used for transmission and/or reception of traffic data in D2D communication. The D2D data resource may be defined in units of subframes on the time axis and in units of resource blocks (RBs) on the frequency axis, but is not limited thereto. The D2D data resource may be a candidate resource capable of transmitting traffic data by the D2D terminal. That is, the D2D data resource may be expressed as a D2D data candidate resource or a D2D data transmission opportunity as another term. The UE may transmit traffic data through all or part of the D2D data resources among the D2D data resources. A D2D data resource actually used by the UE to transmit traffic data may be expressed in terms of a selected D2D data resource.

The D2D SA resource may be a resource used for transmission and/or reception of control data in D2D communication. Similarly, the D2D SA resource may be defined in units of subframes on the time axis and in units of resource blocks (RBs) on the frequency axis, but is not limited thereto. The D2D SA resource may be a candidate resource capable of transmitting control data by the D2D terminal. That is, the D2D SA resource may be expressed in terms of a D2D SA candidate resource or a D2D SA transmission opportunity as another term. The UE may transmit control data through some D2D SA resources among D2D SA resources. A D2D SA resource used by the UE to actually transmit control data may be expressed in terms of a selected D2D SA resource.

Each of the selected D2D data resource and the selected D2D SA resource may be defined as a pattern on each of the D2D data resource and the D2D SA resource. A pattern for the selected D2D data resource and/or the selected D2D SA resource may be expressed in terms of resource pattern for transmission (RPT), and in particular, it may be expressed in terms of time resource pattern for transmission (T-RPT) on the time axis. have.

A set of D2D data resources may be expressed in terms of a D2D data resource pool, and a set of D2D SA resources may be expressed in terms of a D2D SA resource pool. The term D2D resource pool may be used as a concept including a D2D data resource pool and a D2D SA resource pool.

Hereinafter, in an embodiment of the present invention, a method of defining a D2D data resource in a D2D data allocation period is specifically disclosed. Hereinafter, the D2D data resource may be divided into a D2D data transmission resource, which is a resource for transmitting D2D data, and a D2D data reception resource, which is a resource for receiving the D2D data.

4 is a conceptual diagram illustrating a D2D communication resource according to an embodiment of the present invention.

In FIG. 4, D2D data transmission resources defined within the D2D data allocation period are disclosed.

Referring to FIG. 4 , the D2D data allocation period 400 may be a predetermined time unit for allocating D2D data transmission resources. The D2D data allocation period 400 may be one predefined value or one value selected from among a plurality of preset D2D data allocation period values. For example, the D2D data allocation period may be 40 ms, 80 ms, 160 ms, or 320 ms. When the D2D data allocation period 400 is expressed in units of subframes, the D2D data allocation period may be in units of 40, 80, 160, or 320 subframes.

The D2D data transmission resource (or transmission opportunity) 420 may be defined in units of at least one subframe within the D2D data allocation period 400 . Each of the D2D data transmission resources 420 defined in units of at least one subframe may be expressed in terms of unit D2D data transmission resources. That is, the D2D data transmission resource 420 defined within the D2D allocation period may be a set of at least one unit D2D data transmission resource. A unit D2D data transmission resource may be defined in units of one subframe as in FIG. 4 or may be defined in units of a plurality of subframes. Hereinafter, it is assumed that a unit D2D data transmission resource is set in units of one subframe.

One D2D data transmission unit may be transmitted on a unit D2D data transmission resource. The D2D data transmission unit may be a MAC protocol data unit (PDU) on the MAC layer and a data transport block (TB) on the physical layer.

A time-resource pattern for transmission (T-RPT) may be defined based on the D2D data transmission unit. The T-RPT may be a resource pattern on the time axis for transmitting one D2D data transmission unit. The T-RPT may indicate a D2D data transmission resource selected from among a plurality of unit D2D data transmission resources for transmitting one D2D data transmission unit. When there are a plurality of selected D2D data transmission resources, one D2D data transmission unit may be transmitted repeatedly a plurality of times. The T-RPT may be defined based on a basic pattern. The T-RPT and the basic pattern will be described in detail later.

Hereinafter, the number of unit D2D data transmission resources allocated within the D2D data allocation period is defined as a parameter M. The number of selected D2D data transmission resources among M unit data transmission resources in the D2D data allocation period may be defined by a parameter of N.

5 is a conceptual diagram illustrating a D2D communication resource according to an embodiment of the present invention.

5 discloses a method of determining a D2D data transmission resource based on a D2D data transmission resource bitmap.

According to an embodiment of the present invention, the D2D data transmission resource 420 includes a D2D data transmission resource offset 440, a D2D data transmission resource bitmap 460, and a D2D data resource indication bitmap in the D2D data allocation period 400. It may be assigned in consideration of the number of repetitions (480).

The D2D data transmission resource offset 440 may indicate an allocation position of the first D2D data transmission resource bitmap in the D2D data allocation period. The D2D data transmission resource offset 440 may be a time interval corresponding to C subframes on the time axis. The D2D data transmission resource offset 440 may indicate a starting point of the D2D data transmission resource based on the D2D data transmission resource bitmap. Specifically, on the subframe after the point indicated by the D2D data transmission resource offset 440, the D2D data transmission resource based on the D2D data transmission resource bitmap 460 is repeated as many times as the repetition number 480 of the D2D data transmission resource bitmap. can

The D2D data transmission resource bitmap 460 may be defined on a subframe unit including K subframes on the time axis. A subframe unit in which the D2D data transmission resource bitmap 460 is defined may be expressed in terms of a bitmap subframe unit.

Each bit on the D2D data transmission resource bitmap 460 corresponds to each subframe included in the bitmap subframe unit, and the number of subframes included in the bitmap subframe unit is the number of the D2D data transmission resource bitmap 460. can be length. For example, when the number of subframes included in the bitmap subframe unit is K, the length of the D2D data transmission resource bitmap 460 may be K. K may be a specific value in consideration of the D2D data resource allocation period among multiples of 8 or multiples of 10, but is not limited thereto, and various values may be used.

When the unit D2D data transmission resource is a plurality of subframes, each bit on the D2D data transmission resource bitmap 460 may correspond to each of the unit D2D data transmission resources (a plurality of subframes) included in the bitmap subframe unit. have. Hereinafter, in the embodiment of the present invention, it is assumed that each bit of the D2D data transmission resource bitmap 460 corresponds to each subframe included in the bitmap subframe unit.

Each of the plurality of bit values included in the D2D data transmission resource bitmap 460 may be 0 or 1. When a bit value corresponding to a specific subframe of the D2D data transmission resource bitmap 460 is 1, the specific subframe may be a D2D data transmission resource. When a bit value corresponding to a specific subframe of the D2D data transmission resource bitmap 460 is 0, the specific subframe may be a non-D2D data transmission resource. Conversely, when the bit value corresponding to a specific subframe on the D2D data transmission resource bitmap 460 is 0, the specific subframe is a D2D data transmission resource, and when the bit value corresponding to the specific subframe on the bitmap is 1, A specific subframe may be a non-D2D data transmission resource.

In FIG. 5 , the length K of the D2D data transmission resource bitmap 460 may be 10, and the D2D data transmission resource bitmap 460 may be '1010010100'. Each bit of the bitmap may correspond to each of ten subframes sequentially from a most significant bit (MSB) to a least significant bit (LSB). That is, the length of the D2D data transmission resource bitmap 460 is 10, and the D2D data transmission resource bitmap 460 includes 4 subframes corresponding to bit value 1 among 10 subframes of the D2D data transmission resource 420 . can indicate that

의 값으로 결정될 수 있다. 여기서 P는 D2D 데이터 할당 주기, C는 D2D 데이터 전송 자원 오프셋이다. D2D 데이터 전송 자원 비트맵의 반복 횟수가 1인 경우, D2D 데이터 할당 주기 상에서 하나의 D2D 데이터 전송 자원 비트맵 기반의 D2D 데이터 전송 자원이 할당되는 경우를 의미할 수 있다. D2D 데이터 전송 자원 비트맵의 반복 횟수가 2인 경우, D2D 데이터 할당 주기 상에서 두 개의 D2D 데이터 전송 자원 비트맵 기반의 D2D 데이터 전송 자원이 할당되는 경우를 의미할 수 있다.The number of repetitions 480 of the D2D data transmission resource bitmap may be the number of repetitions of each bitmap subframe. When the length of the D2D data transmission resource bitmap 460 is K, the number of repetitions A on the time axis of the bitmap subframe unit is 0<A≤

can be determined by the value of Here, P is a D2D data allocation period, and C is a D2D data transmission resource offset. When the number of repetitions of the D2D data transmission resource bitmap is 1, it may mean that one D2D data transmission resource bitmap-based D2D data transmission resource is allocated in the D2D data allocation period. When the number of repetitions of the D2D data transmission resource bitmap is 2, it may mean that two D2D data transmission resource bitmap-based D2D data transmission resources are allocated in the D2D data allocation period.

For example, as shown in FIG. 4 , the length K of the D2D data transmission resource bitmap 460 is 10 (ms), the D2D data resource offset 440 is 2 (ms), and the D2D data resource allocation period 400 is 160 (ms) (or 160 subframes), the number of repetitions A 480 of the D2D data transmission resource bitmap may be a value in the range of 0<R≤15. That is, the number of repetitions may be up to 15. When the number of repetitions of the D2D data transmission resource bitmap is less than 15, the D2D data transmission resource 420 based on the D2D data transmission resource bitmap 460 only for some subframe sections within the D2D data resource allocation period 400. can be assigned.

As the D2D data allocation period (P) 400 is large and the length (K) of the D2D data transmission resource offset (C) 440 and the D2D data transmission resource bitmap 460 are small, the repetition of the D2D data transmission resource bitmap The number of times 480 may be increased. In consideration of the maximum value of the number of repetitions 480 of the D2D data transmission resource bitmap, the D2D data transmission resource 420 may be allocated in the D2D data allocation period 400 . For example, when P=320, C=0 and K=8, 0<A≤40. In this case, one of 1 to 40 may be selected as the number of repetitions 480 of the D2D data transmission resource bitmap. Based on the number of repetitions 480 of the selected D2D data transmission resource bitmap, the D2D data transmission resource 420 may be allocated in the D2D data allocation period 400 .

Information on the D2D data allocation period 400, information on the D2D data transmission resource offset 440, information on the D2D data transmission resource bitmap 460, and the number of repetitions of the D2D data transmission resource bitmap 480 for The information may be common information on terminals included in the terminal set.

The information for allocating the D2D data transmission resource 420 to an individual terminal or terminal group may be terminal-specific information or terminal-group-specific information. Information for allocating the D2D data transmission resource 420 to an individual terminal or a group of terminals may be expressed in terms of D2D data transmission resource allocation information.

6 discloses a method of determining a selected D2D data transmission resource according to an embodiment of the present invention.

6 discloses a method of transmitting a D2D data transmission unit on a D2D data transmission resource selected from among D2D data transmission resources based on a bitmap of a D2D data transmission resource.

The total number of D2D data transmission resources allocated within the D2D data allocation period M is the total number of repetitions of the D2D data transmission resource bitmap (A) and one D2D data transmission resource bitmap-based D2D data transmission resource (M _s ). can be multiplied

* Specifically, the total number of repetitions (A) of the D2D data transmission resource bitmap is the sum of the number of repetitions of the D2D data transmission resource bitmap for each of the D D2D data transmission units transmitted within the D2D data allocation period (A ₀ + A ₁ +...+ A _i +...+ A _D-1 ) or less. The D D2D data transmission units may be D2D data transmission units 0 to D2D data transmission units D-1. A _i may indicate the number of repetitions of the D2D data transmission resource bitmap for the D2D data transmission unit i (i is an integer from 0 to D-1). M _s is the number of D2D data transmission resources defined in one D2D data transmission resource bitmap. Accordingly, the number of D2D data transmission resources for each of the D D2D data transmission units may be A ₀ xM _s , A ₁ xM _s , ..., A _i xM _s , ..., A _D-1 xM _s .

For example, when K=10, M _s =4, A=15, the D2D data transmission resource bitmap (4 bits among 10 bits are 1) is repeated 15 times (A=15) within the D2D data resource allocation period. to determine the D2D data transmission resource. In this case, _{the product of M s} and A, 60, may be the number of unit D2D data transmission resources within the D2D data allocation period.

The D2D data transmission unit may be transmitted based on the D2D data transmission resource based on the D2D data transmission resource bitmap. In this case, the D2D data transmission resource for one D2D data transmission unit may be determined based on at least one D2D data transmission resource bitmap. For example, a specific D2D data transmission unit is transmitted on a D2D data transmission resource based on a D2D data transmission resource bitmap repeated once, and another D2D data transmission unit is D2D based on a D2D data transmission resource bitmap unit repeated a plurality of times. It may be transmitted on a data transmission resource.

As a specific example, it may be assumed that the number of repetitions of the D2D data transmission resource bitmap is 5 (A=5), and D2D data transmission unit 0 and D2D data transmission unit 1 are transmitted within the D2D data resource allocation period. Also, it may be assumed that _{A 0} is 2, A ₁ is 3, and M _{s =4.} In this case, the D2D data transmission unit 0 is transmitted through the D2D data transmission resource 0 based on the D2D data transmission resource bitmap repeated twice, and the D2D data transmission unit 1 is D2D based on the D2D data transmission resource bitmap repeated 3 times. It may be transmitted through data transmission resource 1. The number of D2D data transmission resource 0 (A ₀ xM _s ) may be 8, and the number of D2D data transmission resource 1 (A ₁ xM _s ) may be 12.

D2D data transmission unit 0 may be transmitted through data transmission resource 0 selected from among D2D data transmission resource 0. Similarly, the D2D data transmission unit 1 may be transmitted through the selected data transmission resource 1 among the D2D data transmission resources 1.

The number of selected D2D data transmission resources for each of the D D2D data transmission units (or the number of repeated transmissions of the D2D data transmission unit) is L ₀ , L ₁ , ..., L _i , ..., L _D-1 can be expressed For example, when L ₀ is 4, the D2D data transmission unit 0 may be repeatedly transmitted 4 times on four selected D2D data transmission resources among the D2D data transmission resources for the D2D data transmission unit 0.

The N selected D2D data transmission resources are _{the sum of L 0} , L ₁ , ..., L _i , ..., L _D-1 (N=L ₀ +L ₁ +...+L _i +... +L _D-1 ). For example, each of L ₀ , L ₁ , ..., L _i , ..., L _D-1 may be 1, 2, 4 or 8.

That is, one D2D data transmission unit _{may be transmitted on L i} selected D2D data transmission resources _{among A i} xM _s D2D data transmission resources.

A selected D2D data transmission resource among a D2D data transmission resource for transmission of one D2D data transmission unit and a D2D data transmission resource for transmission of one D2D data transmission unit may be patterned, and this pattern is a T-RPT.

7 is a conceptual diagram illustrating a T-RPT according to an embodiment of the present invention.

The T-RPT is a pattern for a D2D data transmission resource selected from among a D2D data transmission resource and a D2D data transmission resource for transmission of one D2D data transmission unit.

According to an embodiment of the present invention, the T-RPT may be determined as an extension of the basic pattern. That is, the T-RPT may include at least one basic pattern.

The basic pattern may indicate Y selected D2D data transmission resources among X D2D data transmission resources. That is, X is a parameter for the number of D2D data transmission resources for which a basic pattern is defined, and Y is a parameter for the number of D2D data transmission resources selected from among D2D data transmission resources for which a basic pattern is defined.

A basic pattern can be defined based on various values of X and Y. Referring to FIG. 7 , T-RPT 0 for the first D2D data transmission unit (first MAC PDU in MAC layer, first data TB in physical layer) is two X=4, Y=2-based basic patterns (or 1 X=8, Y=4 based basic pattern), and T-RPT 1 for the second D2D data transmission unit (second MAC PDU in MAC layer, second data TB in physical layer) also includes two X=4 , Y=2 based basic pattern (or one X=8, Y=4 based basic pattern).

For example, the basic pattern 0 and the basic pattern 1 may be determined based on X=4 and Y=2. In this case, the basic pattern may indicate two selected D2D data transmission resources among the four D2D data transmission resources using various combinations based on a Hadamard code (or Walsh code) of length 4 . Alternatively, the basic pattern 0 and the basic pattern 1 may be determined based on X=8 and Y=4. In this case, the basic pattern may indicate 4 selected D2D data transmission resources among 8 D2D data transmission resources by using various combinations of the Hadamard code-based length of 8.

That is, the basic pattern ^{may be determined based on X being 2 m} (m≥2) and Y=X/2. In this case, Y selected D2D data transmission resources among X D2D data transmission resources may be indicated by using one of various combinations based on the Hadamard code having a ^{length of 2 m.} Here, a basic pattern indication bit for indicating information on a basic pattern used among various combinations of basic patterns may be at least m+1 bits. If the bits allocated to the information about the basic pattern are limited to a specific number of bits (eg, 4 bits or 5 bits), only a combination of some basic patterns among possible combinations of basic patterns may be used.

According to an embodiment of the present invention, the number of D2D data transmission resources selected from the basic pattern (or the number of repeated transmissions of the D2D data transmission unit) may be a multiple of 2 such as 1, 2, 4, 8, .... When the selected number of D2D data transmission resources is configured as one of various values, flexibility for D2D communication coverage may be secured.

In consideration of various communication ranges, the number of repeated transmissions of the D2D data transmission unit may be applied more flexibly. For example, a scenario in which many terminals perform D2D communication in a relatively wide communication range (eg, when the ISS is far from the base station, D2D communication to cover a wide range such as an emergency situation, etc.) can increase the number of repeated transmissions of the D2D data transmission unit even at the expense of the overhead for D2D communication resources. Conversely, in a scenario in which D2D communication is possible with a relatively narrow communication range (eg, D2D communication between adjacent terminals, D2D communication for advertisement targeting nearby terminals, etc.), in order to reduce the overhead for D2D communication resources It is possible to reduce the number of repeated transmissions of the D2D data transmission unit. In addition, when considering voice over internet protocol (VoIP), D2D communication may be performed based on a relatively low number of repeated transmissions of a D2D data transmission unit.

Hereinafter, various basic patterns are disclosed in embodiments of the present invention.

8 is a table showing a basic pattern according to an embodiment of the present invention.

In FIG. 8 , a basic pattern of X=4 and Y=2 determined based on a Hadamard code of length 4 is disclosed. This basic pattern can be expressed in terms of (4, 2) basic pattern.

Referring to FIG. 8 , in the table for the Hadamard code-based basic pattern, '1' may indicate a selected D2D data transmission resource. Also, '-1' may indicate a D2D data transmission resource in which a D2D data transmission unit is not transmitted.

According to an embodiment of the present invention, six (4, 2) basic patterns may be determined based on the Hadamard code except for some codes that do not satisfy X=4 and Y=2 among the Hadamard codes of length 4 . Each of the six (4, 2) basic patterns may be indicated by (4, 2) basic patterns 0 to (4, 2) basic patterns 5 .

Among the six (4, 2) basic patterns, (4, 2) basic patterns 0 to (4, 2) basic patterns 2 may be defined based on a Hadamard code having a length of 4. Among the six (4, 2) basic patterns, (4, 2) basic patterns 3 to (4, 2) basic patterns 5 are defined based on a code determined by multiplying each code value of the length 4 based Hadamard code by -1 can be

At least 3 bits may be required to indicate a specific (4, 2) basic pattern among six (4, 2) basic patterns. A bit for indicating a basic pattern may be referred to as a basic pattern indicating bit. One T-RPT may include at least one basic pattern. For example, one T-TRP may be configured based on one or multiple repetitions of a specific basic pattern among (4, 2) basic patterns.

9 is a table showing a basic pattern according to an embodiment of the present invention.

In FIG. 9 , a basic pattern of X=8 and Y=4 determined based on a Hadamard code of length 8 is disclosed. These basic patterns can be expressed in terms of (8, 4) basic patterns.

Referring to FIG. 9 , according to an embodiment of the present invention, 14 (8, 4) based on Hadamard codes excluding some codes that do not satisfy X=8 and Y=4 among Hadamard codes of length 8 A basic pattern can be defined. Each of the 14 (8, 4) basic patterns may be indicated by (8, 4) basic patterns 0 to (8, 4) basic patterns 13 .

Among the 14 (8, 4) basic patterns, (8, 4) basic patterns 0 to (8, 4) basic patterns 6 may be defined based on a Hadamard code having a length of 8. Among the 14 (8, 4) basic patterns, (8, 4) basic patterns 7 to (8, 4) basic patterns 13 are defined based on a code determined by multiplying each code value of a length 8-based Hadamard code by -1 can be

In order to indicate 14 basic patterns, the basic pattern indication bits may be at least 4 bits. One T-RPT may include at least one basic pattern. For example, one T-TRP may be configured based on one or multiple repetitions of a specific basic pattern among (8, 4) basic patterns.

10 is a table showing a basic pattern according to an embodiment of the present invention.

In FIG. 10, a basic pattern of X=16 and Y=8 determined based on a Hadamard code of length 16 is disclosed. This basic pattern can be expressed in terms of (16, 8) basic pattern.

Referring to FIG. 10 , 30 (16, 8) basic patterns may be defined based on the Hadamard code except for some codes that do not satisfy X=16 and Y=8 among the Hadamard codes of length 16. Among them, when 4 basic pattern indication bits are considered, 16 basic patterns can be defined. Among 16 (16, 8) basic patterns, (16, 8) basic patterns 0 to (16, 8) basic patterns 7 may be determined based on a Hadamard code having a length of 16. For example, (16, 8) based on a total of 8 default Hadamard codes from the second Hadamard code, except for the first Hadamard code consisting of only '+1' among the default Hadamard codes of length 16 Patterns 0 to (16, 8) basic pattern 7 may be determined. Among the 16 (16, 8) basic patterns, the remaining (16, 8) basic patterns 8 to (16, 8) basic patterns 15 are the code values of the Hadamard codes corresponding to the basic patterns 0 to (16, 8) basic patterns 7 It can be determined based on the code determined by multiplying each by -1.

Likewise, one T-RPT may include at least one basic pattern. For example, one T-TRP may be configured based on one or multiple repetitions of a specific basic pattern among (16, 8) basic patterns.

The basic pattern determined based on the Hadamard code disclosed in FIGS. 8 to 10 can be generalized and expressed as follows.

^{A basic pattern of X=2 m} and Y=X/2 determined based on a Hadamard code having a length of 2 ^{m may be generated.} These basic patterns can be expressed in terms ^{of (2 m} , 2 ^{m-1 ) basic patterns.}

The number of possible basic patterns for the Hadamard code-based T-RPT having a length of 2 ^{m may be determined as follows.}

In the case of a Hadamard code having a length of 2 ^m , there may be ^{2 m Hadamard codes.} When the first Hadamard code having all code values of 1 among the ^{2 m Hadamard codes is excluded, 2 m} −1 Hadamard codes may be the Hadamard codes for determining the basic pattern. In addition, a basic pattern may be determined based on a code obtained by multiplying the Hadamard code by -1 as well as the Hadamard code.

Therefore, when using a Hadamard code having a length of 2 ^m , the number of possible basic patterns for T-RPT may be 2?( ^2m- 1)= ^2m+1-2 . That is, ^{when using a Hadamard code having a length of 2 m} , the number of possible basic patterns for T-RPT may be ^{2 m+1 -2.}

For example, when using a Hadamard code of length 4 with m=2, the number of basic patterns is 6, and when using a Hadamard code of length 8 with m=3, the number of basic patterns is 14, m=4 When using a Hadamard code with a length of 16, the number of basic patterns is 30. When using a Hadamard code with a length of 32 with m=5, the number of basic patterns is 62, and a Hadamard code with a length of 64 with m=6 is used. In this case, the number of basic patterns may be 126.

A basic pattern indication bit for indicating one basic pattern among a plurality of basic patterns based on the Hadamard code having a length of 2 ^{m may be at least m+1 bits.} If there is a limit to the number of bits of the basic pattern indication bits, only some basic patterns among possible basic patterns based on the Hadamard code ^{having a length of 2 m may be used.} For example, when the basic pattern indication bits are limited to 4 bits, a maximum of 16 Hadamard code-based basic patterns are used, and when the basic pattern indication bits are limited to 5 bits, a maximum of 32 Hadamard code-based basic patterns are can be used

When the basic pattern indication bits are limited to 4 bits, each of the six (4, 2) basic patterns and 14 (8, 4) basic patterns described above may be indicated based on the basic pattern indication bits. In addition, when the basic pattern indication bits are limited to 4 bits, 16 (16, 8) basic patterns out of 30 possible (16, 8) basic patterns can be indicated as shown in FIG. 10 .

When the number M of unit D2D data transmission resources and the number N of selected D2D data transmission resources within the D2D data resource allocation period are fixed, at least one predefined basic pattern as described above in FIGS. 8 to 10 is based on As a result, the D2D data transmission resource and the selected D2D data transmission resource may be allocated. For example, when M=32 and N=16, the basic pattern may be configured based on X=8 and Y=4.

However, M may have full flexibility with a bitmap, etc., and N also includes the number of repeated transmissions of one D2D data transmission unit and the number of different D2D data transmission resources transmitted within the D2D data resource allocation period. and the like may be variable.

When M or N is variable, when the D2D data transmission resource and the selected D2D data transmission resource are allocated based on a predefined basic pattern, the use of the D2D communication resource may be inefficient. Accordingly, the basic pattern needs to be configured variably. When the basic pattern is variable, an overhead of signaling for signaling the changed basic pattern may occur.

Therefore, there is a need for a method for supporting variable M or N without signaling overhead for a change pattern in which the basic pattern is changed.

Hereinafter, in an embodiment of the present invention, (X, Y) increased through repetition of the basic pattern is (Xrep, Yrep), and (X, Y) decreased through the use of some of the basic patterns is (Xred, Yred), finally (X, Y) of the determined change pattern can be expressed as a parameter called (Xnew, Ynew).

The terms D2D data transmission resource (Xrep) and selected D2D data transmission resource (Yrep) may be used to indicate an extended D2D data transmission resource and a selected D2D data transmission resource due to repetition of a basic pattern.

The terms D2D data transmission resource (Xred) and selected D2D data transmission resource (Yred) may be used to indicate a reduced D2D data transmission resource and a reduced D2D data transmission resource due to a reduction in a basic pattern.

The terms D2D data transmission resource (Xnew) and selected D2D data transmission resource (Ynew) may be used to indicate each of a D2D data transmission resource and a D2D data transmission resource indicated based on a change pattern.

Hereinafter, a change pattern of the basic pattern for supporting variable M and/or N is disclosed. For one D2D data transmission unit, a case _{in which L i} D2D data transmission units among _{A i} xM _s D2D data transmission units are used for actual data transmission may be considered.

Excluding the case of X>A _i xM _s , a change pattern may be determined. The basic pattern may be determined such that _{X is less than or equal to A i} xM _s.

11 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern according to an embodiment of the present invention.

In FIG. 11, when X=A _i xM _s , a change pattern generated based on a basic pattern for supporting variable M and/or N is disclosed.

When X=A _i xM _s , the change pattern may be determined by comparing the sizes of Y and L _{i .} For example, it may be assumed that X=8, A _i xM _{s =8.}

1) For Y > L _i

The upper part of FIG. 11 discloses a method of generating a change pattern when _{Y>L i.}

When Y>L _i , only the L _i selected D2D data transmission resources with priority in time may be determined as the selected D2D data transmission resource Ynew of the change pattern. In the remaining YL _i selected D2D data transmission resources, actual traffic transmission may not be performed.

As a specific example, when Y=4 and L _i =2, only the first two selected D2D data transmission resources of the basic pattern may be determined as the selected D2D data transmission resources Ynew of the change pattern. Data may not be transmitted in the remaining two selected D2D data transmission resources.

2) In case of Y=L _i

The terminal may transmit data based on the basic pattern without determining a separate change pattern.

For example, when Y=4 and L _i =4, the UE may transmit data through the selected D2D data transmission resource based on a predefined basic pattern.

3) For Y<L _i

The lower part of FIG. 11 discloses a method of determining a change pattern when _{Y<L i.}

The remaining X-Y D2D data transmission resources excluding the Y selected D2D data transmission resources among the X D2D data transmission resources may also be determined as the selected D2D data transmission resource Ynew of the change pattern.

Specifically, at least one D2D data transmission resource among the remaining XY D2D data transmission resources may be determined as the selected D2D data transmission resource Ynew of the change pattern. Among the XY remaining D2D data transmission resources, the remaining D2D data transmission resource that is ahead in time may be preferentially determined as the selected D2D data transmission resource Ynew of the change pattern. In the change pattern, the number of D2D data transmission resources Ynew selected based on the addition of the selected D2D data transmission resources as described above may be _{L i.}

For example, it may be assumed that Y=4 and L _{i =8.} The (8, 4) basic pattern constituting the T-RPT indicates 4 selected D2D data transmission resources among 8 D2D data transmission resources. In this case, the terminal may transmit data based on a change pattern in which all eight D2D data transmission resources of the basic pattern are set as the selected D2D data transmission resource (Ynew).

12 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern according to an embodiment of the present invention.

In FIG. 12, when X<A _i xM _s , a change pattern generated based on a basic pattern for supporting variable M and/or N is disclosed.

When X<A _i xM _s , a change pattern can be generated by comparing the sizes of Y and L _{i .}

번 반복할 수 있다.

번 반복된 기본 패턴의 길이(Xrep)는 A_ixM_s와 같거나 A_ixM_s보다 클 수 있다.If X<A _i xM _s , the default pattern

can be repeated several times.

Length (Xrep) of the basic pattern repetition times may be greater than or equal to A _i xM _s A _i xM _s.

For example, when X=8 and A _i xM _s =16, the basic pattern may be repeated twice. As another example, when X=8 and A _i xM _s =20, the basic pattern may be repeated 3 times. By repeating the basic pattern 3 times, 8 D2D data transmission resources may be extended to 24 D2D data transmission resources (Xrep). The change pattern may be defined in 20 D2D data transmission resources (Xnew) with priority in time among the extended 24 D2D data transmission resources (Xrep). When the basic pattern is repeated, the selected D2D data transmission resource may also be extended to the selected D2D data transmission resource (rep).

For example, it may be assumed that X=8, Y=4, A _i xM _{s =16.} If the base pattern is repeated twice to form a change pattern, Yrep may be 8. As another example, when X=8, Y=4, A _i xM _S =20, the basic pattern may be repeated 3 times. The application range of the basic pattern repeated three times can be extended to 24 (=Xrep) D2D data transmission resources (Xrep). The change pattern may be defined only in the first 20 (=Xnew) D2D data transmission resources (Xnew) among the 24 extended D2D data transmission resources. Due to the repetition of the basic pattern, the selected D2D data transmission unit may also be extended to the selected D2D data transmission unit Yrep. Yrep is a value greater than Y.

The selected D2D data transmission resource Ynew of the change pattern may be determined through comparison of the size of Yrep determined by repetition of the basic pattern and the size of L _{i .}

1) If Yrep > L _i

The upper part of FIG. 12 shows a method of determining a selected D2D data transmission resource on a change pattern when _{Yrep > L i.}

When Yrep > L _i , the selected D2D data transmission unit (Ynew) may be set only in _{the L i} selected D2D data transmission resources having priority in time among the selected D2D data transmission resources (Yrep). In the remaining Yrep-L _i selected D2D data transmission resources, actual data transmission may not be performed. That is, only some selected D2D data transmission resources among the D2D data transmission resources Yrep selected so that _{Ynew=L i may be used for data transmission.}

For example, when Yrep = 8 and L _i = 4, only four selected D2D data transmission resources that have priority in time among the 8 selected D2D data transmission resources (Yrep) are the selected D2D data transmission resources of the change pattern (Ynew) can be determined as Data may not be transmitted in the remaining four selected D2D data transmission resources. That is, the UE may not transmit data while ignoring the remaining four selected D2D data transmission resources.

2) In case of Yrep=L _i

When Yrep=L _i , a separate pattern change is not required. The UE may transmit data through the selected D2D data transmission resource (Yrep).

3) If Yrep<L _i

The lower part of FIG. 12 shows a method of determining the selected D2D data transmission resource (Ynew) of the change pattern when _{Yrep<L i.}

At least one of the remaining D2D data transmission resources excluding the selected D2D data transmission resource Yrep as well as the selected D2D data transmission resource Yrep may be additionally determined as the selected D2D data transmission resource Ynew.

Specifically, at least one D2D data transmission resource among the remaining Xnew-Yrep D2D data transmission resources may be determined as the additionally selected D2D data transmission resource Ynew. The remaining D2D data transmission resource ahead in time may be determined as the preferentially selected D2D data transmission resource Ynew. Based on this additional determination, the number of selected D2D data transmission resources (Ynew) of the change pattern may be _{L i.}

For example, when Xnew=20, Ynew=8, and L _i =16, the UE may additionally determine eight D2D data transmission resources that are temporally advanced as the additionally selected data transmission resource Ynew. That is, eight D2D data transmission resources other than the selected D2D data transmission resource Yrep and the selected D2D data transmission resource Yrep may be set as the selected D2D data transmission resource Ynew.

Hereinafter, a method of generating a change pattern based on a basic pattern of X=4 and Y=2 will be exemplarily disclosed.

Table 1 below shows the (4, 2) basic pattern based on the Hadamard code.

<Table 1>

The (4, 2) basic patterns in Table 1 are the same as the (4, 2) basic patterns disclosed in FIG. 8 .

* At this time, the following _{cases of L i} values may be considered. In this case, A _i xM _S may be a multiple of 4.

1) L _i =1 (in this case A _i xM _S =4)

According to the method mentioned above, we could make (Xnew, Ynew)=(4,1) from (X, Y)=(4, 2). That is, in each of the (4, 2) basic patterns in Table 1 above, except for the first selected D2D data transmission resource, the remaining D2D data transmission resources are selected regardless of the coat value of the (4, 2) basic pattern. It is not a data transmission resource. Table 2 shows this expression.

Alternatively, Table 3 below in which the (2, 1) pattern and the pattern for the first two unit D2D data transmission resources are the same may be used. That is, Table 3 shows that the (2,1) pattern shown in Table 4 is applied to the first two unit D2D data transmission resources with respect to 4 _{unit D2D data transmission resources (A i} xM _{S =4), and the remaining two unit D2D data transmission resources are transmitted.} For resources, D2D data is not transmitted.

<Table 2>

<Table 3>

<Table 4>

2) L _i =2 (in this case A _i xM _S =4)

Following the method mentioned above, we could make (Xnew, Ynew)=(4,2) from (X, Y)=(4, 2). That is, Table 1 above may be applied as it is for four unit D2D data transmission resources (A _i xM _{S =4).}

3) L _i =4 (in this case A _i xM _S =8)

According to the method mentioned above, we could make (Xnew, Ynew)=(8,4) from (X, Y)=(4, 2). This is to make (Xnew, Ynew)=(8,4) from (Xrep, Yrep)=(8,4) applied by repeating (X, Y)=(4, 2) twice. That is, for 8 unit D2D data transmission resources (A _i xM _S =8), Table 1 above is applied to the first 4 unit D2D data transmission resources as it is, and Table 1 is also applied to the remaining 4 unit D2D data transmission resources. It can be applied repeatedly.

4) L _i =8 (in this case A _i xM _S =16)

According to the method mentioned above, we could make (Xnew, Ynew)=(16,8) from (X, Y)=(4, 2). This is to make (Xnew, Ynew)=(16,8) from (Xrep, Yrep)=(16,8) by repeating (X, Y)=(4, 2) four times. That is, for 16 unit D2D data transmission resources (A _i xM _S =16), Table 1 above is applied to the first 4 unit D2D data transmission resources as it is, and Table 1 is also applied to the next 4 unit D2D data transmission resources. It may be repeatedly applied, then Table 1 may be repeatedly applied to the next 4 unit D2D data transmission resources, and Table 1 may be repeatedly applied to the last 4 unit D2D data transmission resources.

Hereinafter, a method of generating a change pattern based on a basic pattern of X=8 and Y=4 will be exemplarily disclosed.

Table 5 below shows the (8, 4) basic pattern based on the Hadamard code.

<Table 5>

The (8, 4) basic patterns in Table 5 are the same as the (8, 4) basic patterns disclosed in FIG. 9 .

At this time, the following _{cases of the L i} value may be considered. In this case, A _i xM _S may be a multiple of 8.

1) L _i =1 (in this case A _i xM _S =8)

According to the method mentioned above, we could make (Xnew, Ynew)=(8,1) from (X, Y)=(8, 4). That is, in each of the (8, 4) basic patterns in Table 5 above, except for the first selected D2D data transmission resource, the remaining D2D data transmission resources are selected regardless of the coat value of the (8, 4) basic pattern. It is not a data transmission resource. Table 6 shows this expression.

Alternatively, Table 7 below in which the (2, 1) pattern and the pattern for the first two unit D2D data transmission resources are the same may be used. I.e. Table 7 eight unit D2D data transmission resource (A _i xM = _S 8) in the first two units D2D data transmission resources is applied to Table 4. (2, 1) pattern, such as a, and the remaining six units for transmission D2D For resources, D2D data is not transmitted.

<Table 6>

<Table 7>

2) L _i =2 (in this case A _i xM _S =8)

According to the method mentioned above, we could make (Xnew, Ynew)=(8,2) from (X, Y)=(8, 4). That is, in each of the (8, 4) basic patterns in Table 5 above, except for the first two selected D2D data transmission resources, the remaining D2D data transmission resources are selected regardless of the coat value of the (8, 4) basic pattern. It is not a data transmission resource. Table 8 shows this.

Alternatively, Table 9 below, in which the (4, 2) pattern and the pattern for the first four unit D2D data transmission resources are the same, may be used. That is, Table 9 shows that the (4,2) pattern shown in Table 1 is applied to the first 4 unit D2D data transmission resources for 8 _{unit D2D data transmission resources (A i} xM _{S =8), and the remaining 4 unit D2D data transmission resources are transmitted.} For resources, D2D data is not transmitted.

<Table 8>

<Table 9>

3) L _i =4 (in this case A _i xM _S =8)

According to the method mentioned above, we could make (Xnew, Ynew)=(8,4) from (X, Y)=(8, 4). That is, Table 5 above may be applied as it is for 8 unit D2D data transmission resources (A _i xM _{S =8).}

4) L _i =8 (in this case A _i xM _S =16)

According to the method mentioned above, we could make (Xnew, Ynew)=(16,8) from (X, Y)=(8, 4). This is to make (Xnew, Ynew)=(16,8) from (Xrep, Yrep)=(16,8) by repeatedly applying (X, Y)=(8, 4) twice. That is, with respect to 16 unit D2D data transmission resources (A _i xM _S =16), Table 5 above is applied to the first 8 unit D2D data transmission resources as it is, and Table 5 is also applied to the remaining 8 unit D2D data transmission resources. It can be applied repeatedly.

13 is a conceptual diagram illustrating a method for generating a change pattern based on a basic pattern in an embodiment of the present invention.

As described above, it is assumed that L _{i selected D2D data transmission resources among A i} xM _s D2D data transmission resources are used for one D2D data transmission unit. Hereinafter, a method of generating a change pattern when _{X is greater than A i} xM _{S is disclosed.}

Referring to FIG. 13 , if X>A _i xM _S. A change pattern may be determined based on _{A i} xM _S D2D data transmission resources with priority among D2D data transmission resources.

For example, when A _i xM _S =10, a basic pattern having 16 as the X value may be applied. In this case, the change pattern may be determined based on only ten D2D data transmission resources having priority in time among the D2D data transmission resources of the basic pattern.

When X is reduced to Xred, Y may be reduced to Yred.

For example, when X=16, Y=8, A _i xM _s =10, the first 10 D2D data transmission resources among 16 D2D data transmission resources of the basic pattern may be determined as D2D data transmission resources (Xred). . The number of selected D2D data transmission resources (Yred) may be reduced to 4, 5, or 6.

1) When Yred>L _i

Among the selected D2D data transmission resources Yred, only the L _i selected D2D data transmission resources having priority in time may be determined as the selected D2D data transmission resources Ynew.

For example, when Yred is 4 and L _i is 2, two D2D data transmission resources with priority in time among the four D2D data transmission resources corresponding to Yred may be determined as the selected D2D data transmission resource Ynew. Traffic data may be transmitted only on the selected D2D data transmission resource Ynew. Traffic data may not be transmitted in the remaining two D2D data transmission resources.

2) When Yred=L _i

Traffic data may be transmitted on the selected D2D data transmission resource Yred.

For example, Yred = 4 and if the L _i = 4, has traffic data to be transmitted on the D2D data transmission resource is selected without having to create a separate change pattern.

3) If Yred < L _i

In addition to the selected D2D data transmission resource (Yred) as well as the selected D2D data transmission resource (Yred) from among the D2D data transmission resource (Xred), L _i -Yred D2D data transmission resources that have priority among the remaining selected D2D data transmission resources are additionally added It may be set as the selected D2D data transmission resource (Ynew).

For example, when Xred=10, Yred=4, and L _i =8, 4 of the remaining D2D data transmission resources except for the selected D2D data transmission resource (Yred) from among the D2D data transmission resources (Xred) have priority 4 in time The remaining D2D data transmission resources may be set as the additionally selected D2D data transmission resource Ynew.

A basic pattern for T-RPT may be determined in various ways. As described above, when using a Hadamard code of length 4, the number of possible basic patterns for T-RPT is 6, when using a Hadamard code of length 8, the number of possible basic patterns for T-RPT is 14, When using a Hadamard code of length 16, the number of possible basic patterns for T-RPT is 30. When using a Hadamard code of length 32, the number of possible basic patterns for T-RPT is 62, and a Hadamard code of length 64 When using a mad code, the number of possible basic patterns for T-RPT may be 126.

14 is a flowchart illustrating an operation of transmitting traffic data of a terminal according to an embodiment of the present invention.

Referring to FIG. 14 , a D2D data transmission resource is determined (step S1400).

For example, the UE uses cell-specific information for D2D communication through various methods (SIB, PD2DSCH, RRC, D2D SA resource, etc.) (eg, information on a D2D data allocation period, information on D2D data transmission resource offset) , information on the D2D data transmission resource bitmap, information on the number of repetitions of the D2D data transmission resource bitmap) and terminal-specific information for D2D communication (eg, D2D data transmission resource allocation information) may be received. The terminal may determine the D2D data transmission resource based on the received cell-specific information for D2D communication and terminal-specific information (terminal group-specific information) for D2D communication.

The terminal receives D2D communication resource information for transmitting one D2D data transmission unit (step S1420).

_{Information on the number of repetitions (A i} ) of the D2D data transmission resource bitmap for one D2D data transmission unit, and the number of D2D data transmission resources based on one D2D data transmission resource bitmap (M _s ) Information on _{, information on the number (L i} ) of the selected D2D data transmission resource for one D2D data transmission unit may be received.

Traffic data is transmitted through the selected D2D data transmission resource based on the basic pattern or the change pattern of the basic pattern (step S1440).

11 to 13 , it is possible to determine whether to change the basic pattern by comparing the sizes of X (or Xrep, Xred) and A _i xM _s and Y (Yrep, Yred) and L _{i .}

The terminal may transmit traffic data based on the basic pattern when the basic pattern does not need to be changed, and the changed pattern when the basic pattern needs to be changed.

15 is a block diagram illustrating a base station and a terminal according to an embodiment of the present invention.

Referring to FIG. 15 , the base station may include a D2D communication resource determining unit 1500 , a D2D communication resource information generating unit 1510 , a communication unit 1520 , and a processor 1530 . The terminal may include a pattern determiner 1540 , a communication unit 1550 , and a processor 1560 . Each component of the terminal and the base station disclosed in FIG. 15 is functionally exemplary, and one component may be implemented as a plurality of components or a plurality of components may be implemented as one component.

Each component of the terminal and the base station may be implemented to perform the operations of the base station and the terminal described above with reference to FIGS. 4 to 14 . For example, the components of the base station and the terminal may perform the following operations.

The D2D communication resource determiner 1500 of the base station may determine the number of D2D data transmission resources and the selected number of D2D data transmission resources for transmitting one D2D data transmission unit.

The D2D communication resource information generator 1510 of the base station determines the number of D2D data transmission resources for transmitting one D2D data transmission unit determined by the D2D communication resource determiner 1500 and information on the number of selected D2D data transmission resources can be implemented to create

The communication unit 1520 of the base station may be implemented to transmit information on the number of D2D data transmission resources for transmitting one D2D data transmission unit and the number of selected D2D data transmission resources to the terminal.

The processor 1530 of the base station may be implemented to control the operations of the D2D communication resource determiner 1500 , the D2D communication resource information generator 1510 , and the communication unit 1520 .

The communication unit of the terminal may receive information on the number of D2D data transmission resources and the number of selected D2D data transmission resources for transmitting one D2D data transmission unit transmitted by the communication unit 1520 of the base station.

The pattern determiner transmits one D2D data transmission unit based on information on the number of D2D data transmission resources for transmitting one D2D data transmission unit received from the communication unit 1520 of the base station and the number of selected D2D data transmission resources. pattern can be determined. The pattern determiner compares the sizes of X (or Xrep, Xred) with A _i xM _s , and Y (Yrep, Yred) with L _i as disclosed in FIGS. 11 to 13 , and a basic pattern for transmitting traffic data Alternatively, a change pattern of the basic pattern may be determined.

The processor 1580 of the terminal may be implemented to control the operation of the pattern determiner and the communication unit.

The processor may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. Memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The RF unit may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) that performs the above-described function. A module may be stored in a memory and executed by a processor. The memory may be internal or external to the processor, and may be coupled to the processor by various well-known means.

In the exemplary system described above, the methods are described on the basis of a flowchart as a series of steps or blocks, however, the present invention is not limited to the order of steps, and some steps may occur in a different order or concurrently with other steps as described above. can In addition, those skilled in the art will understand that the steps shown in the flowchart are not exhaustive and that other steps may be included or that one or more steps of the flowchart may be deleted without affecting the scope of the present invention.

Claims (6)

A device for transmitting D2D data using a device-to-device (D2D) data transmission resource, the device comprising:
wireless transceiver; and
The wireless transceiver is configured to receive configuration information associated with a D2D data transmission resource, wherein the configuration information includes D2D data allocation period information and is transmitted from a base station,
one or more processors; and
the one or more processors,
and determine a D2D data transmission resource in each D2D data allocation period, wherein the D2D data transmission resource includes a pool of subframes;
and select D2D data transmission subframes from the pool of subframes based on a changed pattern, wherein the changed pattern is derived from a basic pattern,
the wireless transceiver transmits D2D data from the device to another device based on the selected D2D data transmission subframes;
Selecting the D2D data transmission subframes comprises:
By comparing the number R of subframes in the pool of subframes and the length X of the basic pattern, when R and X are the same, R is greater than X, and R is less than X. A changed pattern based on at least one of including determining
when R and X are not the same, determining a changed pattern based on the difference in multiples of said R and X;
wherein R and X are natural numbers, and the length of the changed pattern corresponds to the number of subframes in the pool of subframes.
According to claim 1,
The changed pattern includes a part of the basic pattern at the end of the changed pattern, but does not include the remaining part of the basic pattern.
3. The method of claim 2,
A portion of the basic pattern precedes the remaining portion of the basic pattern, an apparatus for transmitting D2D data.
According to claim 1,
Selecting the D2D data transmission subframes comprises:
and determining the changed pattern by repeating the basic pattern based on determining that the number of the subframes in the pool of subframes is greater than the length of the basic pattern.
5. The method of claim 4,
the one or more processors,
The changed pattern includes a first part and a second part,
The first part of the changed pattern comprises at least one repetition of the basic pattern, and the length of the second part of the changed pattern is related to a multiple difference of R and X.
According to claim 1,
When R is less than X, the changed pattern consists of a first part of the basic pattern,
In the basic pattern, the first part of the basic pattern precedes the remaining part of the basic pattern,
The length of the changed pattern corresponds to R, an apparatus for transmitting D2D data.

Images