KR20150128269A - Apparatus and method for transmitting control information in device to device communication - Google Patents

Abstract

Disclosed are a method and apparatus for transmitting control information in device to device (D2D) communications. According to the present invention, the method comprises the following steps: a first terminal transmits, to a second terminal, information on sub-resource pattern for transmission (RPT) for transmitting D2D data of a transport block (TB) unit; and the first terminal transmits the D2D data to the second terminal on at least one D2D communications resource based on at least one sub-RPT. The information on the sub-RPT includes information on the D2D communications resource which transmits the D2D data. The sub-RPT configures RPT, and each sub-RPT can indicate one or more D2D communications resources which are to transmit only D2D data among a plurality of D2D communications candidate resources.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for transmitting control information in D2D communication,

The present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting control information in D2D (device to device) communication.

The amount of data transmitted through wireless communication is increasing. However, since the frequency resources that can be provided by service providers are limited and already saturated, mobile communication carriers are constantly developing technologies for finding new frequencies and improving the efficiency of frequency use. D2D (Device-to-Device) communication technology is one of the technologies currently being actively studied as a way to mitigate such shortage of frequency resources and to create new mobile communication services.

D2D communication refers to a technique in which terminals close to each other in geographical proximity directly exchange information without going through an infrastructure such as a base station. D2D communication technology has been developed and standardized mainly in the license-exempt band such as Wi-Fi Direct and Bluetooth, which have already been commercialized. However, in recent years, technology development and standardization for supporting D2D communication in a cellular system using a license band are underway. As a typical example, the 3rd Generation Partnership Project (3GPP), a mobile communication standardization organization, actively works on standardization of D2D communication technology called ProSe (Proximity-based Services) as one of the new technologies included in LTE (Long Term Evolution)

SUMMARY OF THE INVENTION The present invention provides a method for transmitting control information by a terminal in D2D communication.

Another object of the present invention is to provide a device for transmitting control information in a D2D communication.

According to an aspect of the present invention, there is provided a method of transmitting control data in a D2D (device to device) communication, the method comprising: Transmitting resource pattern for transmission (RPT) information to a second terminal and transmitting the D2D data to the second terminal on at least one sub-RPT based at least one D2D communication resource Wherein the sub-RPT information includes information about the at least one D2D communication resource transmitting the D2D data, the at least one sub-RPT constitutes an RPT, and each of the at least one sub-RPT comprises a plurality The at least one D2D communication resource for transmitting only the D2D data among the D2D communication candidate resources of the D2D communication candidate.

According to another aspect of the present invention, there is provided a first terminal for transmitting control data in a device-to-device (D2D) communication, comprising: a radio frequency (RF) And a processor selectively connected to the RF unit, wherein the processor transmits sub-RPT (resource pattern for transmission) information for transmitting D2D data in transport block units (TB) to a second terminal, Wherein the sub-RPT information includes information about the at least one D2D communication resource for transmitting the D2D data, the sub-RPT information including information about the at least one D2D communication resource for transmitting the D2D data Wherein the at least one sub-RPT constitutes an RPT, and each of the at least one sub-RPT includes only the D2D data among a plurality of D2D communication candidate resources The at least one of the D2D communication resource for transmission may indicate.

In D2D communication, a terminal can transmit D2D data based on a predetermined resource unit capable of transmitting data at least once without collision. Therefore, the performance of the D2D data transmission can be improved. In addition, the UE can efficiently transmit control data for D2D communication resource allocation without waste of bits.

1 is a block diagram illustrating a wireless communication system.
2 and 3 schematically show the structure of a radio frame to which the present invention is applied.
4 is a conceptual diagram illustrating D2D (device-to-device) communication.
FIG. 5 shows the resource allocation unit defined in the D2D communication.
Fig. 6 is a conceptual view showing the RPT.
7 is another conceptual diagram showing RPT.
8 is a conceptual diagram illustrating a resource allocation method in D2D communication according to an embodiment of the present invention.
9 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.
10 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.
11 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.
12 is a conceptual diagram illustrating a method of signaling sub-RPT information according to an embodiment of the present invention.
13 is a conceptual diagram illustrating a method of transmitting sub-RPT information according to an embodiment of the present invention.
14 is a conceptual diagram illustrating allocation of sub-RPTs on a D2D resource pool according to an embodiment of the present invention.
15 is a conceptual diagram illustrating allocation of sub-RPTs in a D2D resource pool according to an embodiment of the present invention.
16 is a conceptual diagram illustrating a D2D resource pool according to an embodiment of the present invention.
17 is a conceptual diagram illustrating a method of signaling RPT information according to an embodiment of the present invention.
18 is a flowchart illustrating a method of transmitting D2D communication data according to an embodiment of the present invention.
19 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. 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.

The present invention will be described with reference to a communication network. The work performed in the communication network may be performed in a process of controlling the network and transmitting data by a system (e.g., a base station) that manages the communication network, The work can be done.

1 is a block diagram illustrating a wireless communication system.

Referring to FIG. 1, a wireless communication system 10 may provide a communication service between a base station and a terminal. In a wireless communication system, a terminal and a base station can transmit and receive data wirelessly. In addition, the wireless communication system may support D2D (device to device) communication between the terminal and the terminal. A wireless communication system supporting D2D communication will be described later.

A base station (BS) 11 of a wireless communication system 10 can provide a communication service through a specific frequency band to a terminal existing within the transmission coverage of the base station. The coverage served by the base station may also be expressed in terms of a site. A site may include a plurality of areas 15a, 15b, 15c, which may be referred to as sectors. Each of the sectors included in the site can be identified based on different identifiers. Each of the sectors 15a, 15b, and 15c can be interpreted as a partial area covered by the base station 11.

The base station 11 generally refers to a station that communicates with the terminal 12 and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, a femto base station (Femto eNodeB) (ENodeB), a relay, a remote radio head (RRH), and the like.

A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like.

Depending on the size of the coverage provided by the base station, it may be referred to by various terms such as megacell, macrocell, microcell, picocell, femtocell, and the like. The cell may be used in terms of the frequency band provided by the base station, the coverage of the base station, or the term indicating the base station.

Hereinafter, a downlink refers to a communication or communication path from the base station 11 to the terminal 12, and an uplink refers to a communication or communication path from the terminal 12 to the base station 11 do. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11. There is no limit to the multiple access scheme applied to the wireless communication system 10. [ (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. These modulation techniques increase the capacity of the communication system by demodulating signals received from multiple users of the communication system. The uplink transmission and the downlink transmission may be performed using a time division duplex (TDD) scheme transmitted at different times or a frequency division duplex (FDD) scheme using different frequencies.

The layers of the radio interface protocol between the terminal and the base station are divided into a first layer (L1), a second layer (L1), and a second layer (L2) based on the lower three layers of an Open System Interconnection A second layer (L2), and a third layer (L3). Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel.

In the physical layer, a plurality of physical channels can be defined and data can be transmitted through a physical channel. The physical downlink control channel (PDCCH) includes a resource allocation and transmission format of a downlink shared channel (DL-SCH), a resource of an uplink shared channel (UL-SCH) And may include allocation information. The PDCCH includes a random access response transmitted on a physical downlink shared channel (PDSCH), a transmission power control (TPC) command for individual terminals in an arbitrary terminal group, and the like. Lt; / RTI > A plurality of PDCCHs can be defined in a control region for a specific terminal. The UE can acquire control information by monitoring a plurality of PDCCHs.

Control information of the physical layer mapped to the PDCCH is referred to as downlink control information (DCI). That is, the DCI is transmitted on the PDCCH. DCI includes uplink resource grant information or downlink resource assignment information, uplink transmission power control information, control information for paging, control information for indicating a random access response (RA response), etc. . ≪ / RTI >

2 and 3 schematically show the structure of a radio frame to which the present invention is applied.

Referring to FIGS. 2 and 3, a radio frame includes 10 subframes. One subframe includes two slots. The time (length) for transmitting one subframe is called a transmission time interval (TTI). Referring to FIG. 2, for example, the length of one subframe (1 subframe) may be 1 ms and the length of one slot may be 0.5 ms.

One slot may contain a plurality of symbols in the time domain. For example, in the case of a radio system using an OFDMA (Orthogonal Frequency Division Multiple Access) in a downlink (DL), the symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol, In the case of a radio system using Single Carrier-Frequency Division Multiple Access (FDMA), the symbol may be a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol. On the other hand, the representation of the symbol period of the time domain is not limited by the multiple access scheme or the name.

The number of symbols included in one slot may vary according to the length of a CP (Cyclic Prefix). For example, in the case of a normal CP, one slot includes seven symbols, and in the case of an extended CP, one slot may include six symbols.

A resource block (RB) is a resource allocation unit, and may be a time-frequency resource corresponding to 180 kHz on the frequency axis and 1 slot on the time axis. A resource element (RE) is a smallest time-frequency resource to which a modulation symbol of a data channel or a modulation symbol of a control channel is mapped, and is a symbol corresponding to one symbol in the time domain and one subcarrier in the frequency domain.

In a wireless communication system, it is necessary to estimate the state of an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, and the like. The terminal and / or the base station can perform channel estimation for recovering a transmission signal by compensating for distortion of a signal caused by a sudden change in the channel environment.

The terminal and the base station can use a reference signal (RS) for channel estimation between the terminal and the base station.

In the case of downlink channel estimation, the UE knows the information of the reference signal received from the Node B. Accordingly, the UE estimates a channel based on the reference signal received from the Node B and compensates the channel value, thereby accurately obtaining downlink data transmitted from the Node B.

In the case of the uplink channel estimation, the downlink channel estimation can be performed in the same manner as the downlink channel estimation, except that the transmitting entity of the reference signal is the terminal and the receiving entity is the base station.

The reference signal can generally be generated based on the reference signal sequence. The reference signal sequence may be one or more of several sequences having superior correlation characteristics. For example, a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence such as a Zadoff-Chu (ZC) sequence or a PN (pseudo-noise) sequence such as an m-sequence, a Gold sequence or a Kasami sequence May be used as the reference signal sequence, and various other sequences having superior correlation characteristics may be used depending on system conditions. Also, the reference signal sequence may be used by cyclic extension or truncation in order to adjust the length of the sequence, or may be formed in various forms such as binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK) And may be modulated and mapped to a resource element.

(RS), a cell-specific RS (CRS) reference signal, a UE-specific RS, a position RS, and a channel state information A channel state information (CSI) reference signal (CSI-RS) or the like may be used as a reference signal in the downlink.

The UE-specific reference signal is a reference signal received by a specific UE or a specific UE group in the cell. May be referred to as a downlink demodulation RS (DM-RS) because it is mainly used for demodulating downlink data for a specific terminal or a specific terminal group.

Similar to the downlink, the UE can transmit the uplink reference signal to the Node B on the uplink. The uplink reference signal may include uplink DM-RS and SRS. The uplink DM-RS may be used for coherent demodulation of the base station for uplink physical channels (PUSCH) and physical uplink control channel (PUCCH). Therefore, the uplink DM-RS may be allocated to the frequency bandwidth to which the PUSCH or PUCCH is allocated.

The uplink SRS can be used for channel estimation for channel dependent scheduling and link adaptation according to the uplink channel. When there is sufficient reciprocity between the uplink and downlink, that is, when the uplink and downlink channels have sufficiently similar characteristics, the uplink SRS can be used to estimate the downlink channel state.

4 is a conceptual diagram illustrating D2D (device-to-device) communication.

D2D communication may mean a technique of directly transmitting and receiving data between terminals. Hereinafter, it is assumed that the terminal to be published in the embodiment of the present invention supports D2D communication.

In a cellular system, the load of a base station can be dispersed when terminals at close distances perform D2D communication. In addition, when terminals perform D2D communication, the terminal transmits data at a relatively short distance, so that the transmission power consumption and latency of the terminal can be reduced. In addition, since the existing cellular-based communication and D2D communication use the same resources, the frequency utilization efficiency can be improved.

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

Referring to FIG. 4, the communication between the first terminal 410 located in the first cell and the second terminal 420 located in the second cell may be a D2D communication between terminals located within the network coverage. The communication between the fourth terminal 440 located in the first cluster and the fifth terminal 450 located in the first cluster may be a D2D communication between terminals located outside the network coverage.

D2D communication can be divided into a search procedure for performing discovery for communication between terminals and a direct communication procedure for transmitting and receiving control data and / or traffic data between terminals. D2D communication can be used for various purposes. For example, D2D communication within network coverage and D2D communication outside network coverage can be used for public safety. D2D communication outside network coverage may be used only for public safety.

As one embodiment of D2D communication, the base station 400 may transmit D2D resource allocation information to the first terminal 410. [ The first terminal 410 is a terminal located within the coverage of the base station 400. The D2D resource allocation information may include allocation information for a transmission resource and / or a reception resource that can be used for D2D communication between the first terminal 410 and another terminal (e.g., the second terminal 420) .

The first terminal 410 receiving the D2D resource allocation information from the base station can transmit the D2D resource allocation information to the second terminal 420. The second terminal 420 may be a terminal located outside the coverage of the base station 400. The first terminal 410 and the second terminal 420 can perform D2D communication based on the D2D resource allocation information. Specifically, the second terminal 420 can acquire information on the D2D communication resources of the first terminal 410. [ The second terminal 420 can receive data transmitted from the first terminal 410 through the resource indicated by the information on the D2D communication resource of the first terminal 410. [

In D2D communication, a terminal can transmit control data to another terminal. A separate channel (for example, a physical uplink control channel (PUCCH)) for transmitting control data in the D2D communication may not be defined. If the control channel is not defined in the D2D communication, the terminal can 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. Actual traffic data distinguished from control data in D2D communication can be expressed by the term D2D data.

D2D communication within network coverage may be represented by first mode communication, and D2D communication outside network coverage may be expressed by second mode communication. In the first mode communication, the base station or the relay node can schedule accurate information on resources for D2D communication of the terminal. Specifically, in the first mode communication, the base station can transmit resource allocation information on control data (or SA data) and resource allocation information on traffic data (or D2D data) to the terminal.

In the second mode communication, the UE can directly schedule resources for D2D communication based on the D2D resource pool. Specifically, in the second mode communication, resource allocation information for transmission of control data and resource allocation information for traffic data can be selected by the terminal from the D2D resource pool. D2D resource pools can be pre-configured or semi-statically allocated.

FIG. 5 shows the resource allocation unit defined in the D2D communication.

Referring to FIG. 5, resources for D2D communication may be defined based on a D2D resource pool 500, transmission opportunities 520, and resource pattern for transmission (RPT).

The D2D resource pool 500 may be a collection of resources (hereinafter referred to as D2D communication candidate resources) that can be used for D2D communication. Specifically, the D2D resource pool 500 may be a collection of directed resources (D2D communication candidate resources) based on transmission opportunities.

The transmission opportunity 520 may correspond to the D2D communication candidate resource. Within D2D resource pool 500, a plurality of transmission opportunities may be defined. For example, a transmission opportunity (or D2D communication candidate resource) may be defined continuously or discontinuously in at least one (e.g., one subframe or two) subframe units in successive subframes . That is, transmission opportunities defined in units of one or two subframes in successive subframes may be consecutive, and transmission opportunities defined in units of one or two subframes in successive subframes may be several Or discontinuously at sub-frame intervals. As a specific example, if it is defined discontinuously, consecutive subframes can be divided into four or more subframe units, and one preceding subframe in units of four or more subframes divided can be divided into transmission opportunities (or D2D communication candidate resources ). ≪ / RTI >

RPT may include pattern information of time resources and / or frequency resources (hereinafter referred to as D2D communication resources) actually used for transmission of control data and / or D2D data of a terminal among D2D communication candidate resources. RTP can be defined in various patterns and can be defined in various lengths. For example, RPT may be a pattern for D2D communication resources on a D2D communication resource candidate defined in one D2D resource pool 500. [

Specifically, the terminal can transmit control data on a D2D communication resource (RPT-based D2D communication resource) indicated based on the RPT. One control data unit may be transmitted in one RPT-based D2D communication resource, or a plurality of control data units may be transmitted. Similarly, the terminal can transmit D2D data on an RPT-based D2D communication resource. D2D data can be transmitted on RPT-based D2D communication resources in transmission block (TB) units. One TB unit of D2D data may be transmitted on one RPT-based D2D communication resource, or a plurality of TB units of D2D data may be transmitted.

Fig. 6 is a conceptual view showing the RPT.

6, the D2D communication resources based on the first RPT 610 and the D2D communication resources based on the second RPT 620 are posted on the D2D communication candidate resources corresponding to the total N (N = 8) transmission opportunities.

Each RPT can indicate M transmission opportunities out of N transmission opportunities to transmit D2D data. In other words, each RPT may indicate M D2D communication resources among N D2D communication candidate resources.

The terminal may transmit control data and / or D2D data on M RPD based M D2D communication resources. A terminal may receive control data and / or D2D data of another terminal on N-M D2D communication candidate resources excluding M D2D communication resources among N D2D communication candidate resources.

6, the terminal transmits control data and / or D2D communication data through four RPD-based D2D communication resources, and transmits control data and / or D2D communication data from the other terminals on the remaining four D2D communication candidate resources, And / or D2D communication data.

The first RPT and the second RPT may have orthogonality with each other. Specifically, when different RPT-based D2D communication resources are not overlapped in time, data transmitted through RPT-based D2D communication resources may not collide with data transmitted through other RPT-based D2D communication resources. As a concrete example, it can be assumed that the first terminal performs the first RPT-based D2D communication and the second terminal performs the second RPT-based D2D communication. In this case, the first terminal can transmit the D2D data to the second terminal without collision. Similarly, the second terminal can transmit the D2D data to the first terminal without collision.

개 이하(여기서, N은 D2D 통신 후보 자원의 개수, M은 D2D 통신 자원의 개수)의 단말에 대해서만 직교성이 보장될 수 있다(도 6의 경우,

=2). 다른 표현으로 직교성을 만족하는 RTP의 개수가

개 뿐일 수 있다.If the plurality of RTPs are defined to have orthogonality with each other,

(Where N is the number of D2D communication candidate resources, and M is the number of D2D communication resources) (in case of FIG. 6,

= 2). In other words, the number of RTPs that satisfy orthogonality is

Only dogs can be.

개를 초과하는 경우, 단말 간 D2D 통신을 수행 시 전송되는 데이터 간의 직교성이 완전히 깨질 수 있다. 따라서, D2D 통신을 통해 제어 데이터 또는 D2D 데이터를 송신 또는 수신할 수 없는 경우가 발생할 수 있다.
Therefore, a terminal performing D2D communication

The orthogonality between the data transmitted when performing the D2D communication between the terminals can be completely broken down. Therefore, it may happen that control data or D2D data can not be transmitted or received through D2D communication.

7 is another conceptual diagram showing RPT.

7, the D2D communication resource based on the first RPT (pattern # 0) 710 to the 70th RPT (pattern # 69) 750 on the D2D communication candidate resource corresponding to the total N (N = 8) Based D2D communication resources are published.

As in FIG. 6, each RPT may be pattern information for M D2D communication resources among N D2D communication candidate resources. The terminal can transmit control data and D2D data on M D2D communication resources. A terminal may receive control data or D2D data from another terminal on N-M D2D communication candidate resources excluding M D2D communication resources among N D2D communication candidate resources.

The first RPT 710 to the seventh RPT 750 may indicate four D2D communication resources among the eight D2D communication candidate resources. A large number of RPTs of the first to seventh RPTs 710 to 750 may not be orthogonal to each other. For example, referring to the first RPT and the second RPT, three D2D communication resources 760 may collide and one D2D communication resource 770, 780 may not collide. As another example, referring to the first RPT and (710) seventh RPT 750, all D2D communication resources may not collide.

In the case of FIG. 7, when the terminal transmits D2D data through M D2D communication resources, at least 0 to M-1 D2D communication resources may collide with D2D communication resources of other terminals.

That is, when a maximum of M-1 collisions occur in the D2D communication resources, the terminal performs D2D communication through one communication resource among the M communication resources. Therefore, performance degradation of D2D communication may occur.

7, when the number of RPTs is defined as (N, M) = N! / M! (NM) where N is the number of D2D communication candidate resources, M is the number of D2D communication resources Number). Thus, an unnecessarily large number of RPTs is defined, and the signaling overhead for indicating one RPT can be large.

Hereinafter, a method for solving the problem of resource allocation in the D2D communication and a method for instructing the method will be described in the embodiments of the present invention.

8 is a conceptual diagram illustrating a resource allocation method in D2D communication according to an embodiment of the present invention.

Referring to FIG. 8, in a D2D communication resource allocation method according to an embodiment of the present invention, a sub RPT is newly defined, and a terminal can transmit control data and D2D data based on a sub-RPT.

The sub-RPT according to the embodiment of the present invention can be defined as follows. One RPT may include a plurality of (Ks) sub-RPTs. One sub-RPT may be a pattern of D2D communication resources defined in a D2D communication candidate resource of Ls (e.g., Ls = 4). Thus, one RPT may be a pattern for Nr (= Ks? Ls) D2D communication candidate resources.

One D2D communication candidate resource may correspond to A (e.g., one or two) subframes. When A is 1, one subframe is one D2D communication candidate resource, and when A is 2, two subframes may be one D2D communication candidate resource.

B-1 subframes may be located between the next communication candidate resource after one communication candidate resource. That is, the second communication candidate resource may be located after the (B-1) th sub-frame after the first communication candidate resource. (For example, B = 5) when considering the assumption of the uplink decoding time of the PUSCH in the existing LTE system. B may be pre-configured and signaled considering the number of D2D communication candidate resources (or the length of the D2D resource pool) constituting the D2D resource pool, and may be pre-defined in the specification, .

One sub-RPT-based D2D communication resource may transmit one control data transmission unit or one D2D data transmission unit. At this time, one control data transmission unit may be one SA (Scheduling Assignment) unit, and one D2D data transmission unit may be one TB (transport block) unit.

The TB is a data unit transmitted from the MAC (medium access control) layer and can be transmitted by the MAC layer every TTI (transmission time interval) corresponding to 1 ms. The TB transmitted by the MAC can be transmitted through a sub-RPT-based D2D communication resource through cyclic redundancy check (CRC) insertion, channel coding, scrambling, and modulation according to the transmission block.

Specifically, a plurality of sub-RPT-based D2D communication resources may be used. The same TB can be repeatedly transmitted through each of the plurality of D2D communication resources based on the sub RPT. That is, each of the plurality of D2D communication resources based on the sub RPT can repeatedly transmit the same TB. That is, only one TB including the same data (for example, D2D data) can be transmitted through one sub-RPT-based D2D communication resource and different data can be transmitted through one sub-RPT-based D2D communication resource Lt; RTI ID = 0.0 > TB < / RTI > As a specific example, the first TB may be transmitted through the first sub-RPT-based first D2D communication resource and the second TB may be transmitted through the second sub-RPT-based second D2D communication resource. In another example, the first TB may be transmitted through a first sub-RPT-based first D2D communication resource and a second sub-RPT-based second D2D communication resource. Of course, a plurality of different TBs can be transmitted through an RPT-based D2D communication resource, which is a set of a plurality of sub-RPTs.

The number of sub-RPT-based D2D communication resources may be L ₁ (for example, L ₁ = Ls / 2) among the number of the D ₂ D communication candidate resources Ls. That is, one TB containing the same data (e.g., data D2D) through the D2D communication resources of the sub-base RPT is repeated L times _one may be sent. The terminal may transmit data on the sub-RPT-based L ₁ D2D communication resources and the remaining Ls-L through _one candidate D2D communication resource receives data from the other terminals.

According to the embodiment of the present invention, the first D2D communication resource based on the first sub RPT and the second D2D communication resource based on the second sub RPT can be prevented from overlapping at least once. By using this method, the first D2D data transmitted through the first D2D communication resource based on the first sub-RPT and the second D2D data transmitted through the second sub-RPT based second D2D communication resource are collided at least once I can not.

8, one D2D resource pool can be defined on 160 subframes (160 ms), and A = 1, B = 5, Ls = 4, Ks = 8, and Nr = 32. Here, A is the number of subframes corresponding to one D2D communication candidate resource, B is the number of subframes located in one communication candidate resource and the next communication candidate resource, Ls is the number of subframes corresponding to the D2D communication candidate resource Number of sub-RPT included in one RPT, and Nr may be the number of D2D communication candidate resources for defining one RPT.

As another example, one D2D resource pool may be defined on 80 subframes (80 ms), where A = 1, B = 5, Ls = 4, Ks = 4, Nr = 16.

One TB can be transmitted using Ka sub-RPTs. At this time, TB can be transmitted on Ma D2D communication resources among Na (Ls * Ka) D2D communication candidate resources.

In case of TB A transmitted by the first terminal in FIG. 8, for example, Ka = 2, and TB A may be transmitted through four D2D communication resources among the eight D2D communication candidate resources. In the case of Ls = 4, when Ka is 4, 2 and 1, Na and Ma are respectively (Ka = 4, Na = 16, Ma = 8) 4), (Ka = 1, Na = 4, Ma = 2).

Hereinafter, a sub-RPT-based data transmission method according to an embodiment of the present invention will be specifically described.

9 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.

Referring to FIG. 9, the first sub-RPT 910 to the sixth sub-RPT 960 may be defined.

For example, it is assumed that one sub-RPT is a pattern for two D2D communication resources on four D2D communication candidate resources.

One sub-RPT may be a pattern for L / 2 D2D communication resources on L D2D communication candidate resources. The terminal can transmit control data and D2D data through the L / 2 D2D communication resources based on the sub-RPT. Hereinafter, it is assumed that D2D data is mainly transmitted on a D2D communication resource for convenience of explanation, but control data can also be transmitted.

The terminal can transmit D2D data through two D2D communication resources on four D2D communication candidate resources based on the RPT of one of the first sub-RPT 910 to the sixth sub-RPT 960. The terminal can receive the D2D data from the other terminal on the remaining two D2D communication candidate resources excluding the two D2D communication resources out of the four D2D communication candidate resources.

If one sub-RPT is a pattern for L / 2 D2D communication resources defined on L D2D communication candidate resources, the first sub-RPT based first D2D communication resource and the second sub-RPT based second D2D communication resource May not overlap at least at least L / 4 and at most L / 2. In other words, the first D2D communication resource based on the first sub-RPT and the second D2D communication resource based on the second sub-RPT can be overlapped in at least 0 and at most L / 4.

That is, when D2D communication is performed between a plurality of terminals, the terminal can transmit D2D data without collision through at least L / 4 sub-RPT-based D2D communication resources of at most L / 2.

9, the first terminal transmits D2D data based on the first sub-RPT 910 and the second terminal transmits D2D data based on the second sub-RPT 920 to the fifth sub-RPT 950, When transmitting data, one D2D communication resource is overlapped, and one D2D communication resource may not be overlapped. That is, the first terminal and the second terminal can transmit D2D data through one D2D communication resource.

In another example, when the first terminal transmits D2D data based on the first sub-RPT 910 and the second terminal transmits D2D data based on the sixth sub-RPT 960, two D2D communication resources They may not overlap. That is, the first terminal and the second terminal can transmit D2D data using all of the two allocated D2D communication resources.

As described above, the terminal can repeatedly transmit one D2D data TB through each of a plurality of D2D communication resources based on one sub-RPT. An RPT including K sub-RPTs can transmit at least one and at most K different TBs based on RPT-based D2D communication resources. Each of the K sub-RPTs constituting one RPT may transmit one D2D data TB (one TB), and each of the K sub-RPTs constituting one RPT may transmit different D2D data TB (K different TBs May be transmitted.

Expanded to RPT, an RPT containing K sub-RPTs may be a pattern for N / 2 D2D communication resources on N D2D communication candidate resources. Different RPTs may overlap in up to N / 4 D2D communication resources. From a transmission point of view, a terminal can transmit D2D data without collision through at least N / 4 and N / 2 D2D communication resources. Hereinafter, in FIGS. 10 and 11, an RPT-based data transmission method including a plurality of sub-RPTs is posted.

10 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.

In FIG. 10, a sub-RPT-based data transmission method is published based on a plurality of sub-RPTs constituting one RPT.

The RPT may include a plurality of sub-RPTs of the same pattern. For example, the RPT may include a first sub-RPT and a first sub-RPT, or may include a second sub-RPT and a second sub-RPT.

RPT can be defined in four D2D communication resources among eight D2D communication candidate resources. Collision between at least 0 and at most 1 D2D communication resources based on the sub-RPT may occur. That is, the terminal can transmit D2D data through at least one and at most two D2D communication resources. Based on the RPT, a collision between at least 0 and at most 2 D2D communication resources may occur. That is, the terminal can transmit D2D data through at least two and at most four D2D communication resources.

As a specific example, if the first terminal transmits D2D data based on the first RPT (first sub-RPT + first sub-RPT) 1010 and the second terminal transmits the second RPT (second sub-RPT + ) To the fifth RPT (the fifth sub RPT + the fifth sub RPT) 1050. In this case, In this case, two D2D communication resources among the four D2D communication resources are overlapped, and two D2D communication resources may not overlap. That is, the first terminal and the second terminal can transmit D2D data through two D2D communication resources.

As another example, if the first terminal transmits D2D data based on the first RPT (first sub RPT + first sub RPT) 1010 and the second terminal transmits the sixth RPT (sixth sub RPT + sixth sub RPT) 1060 ), It is assumed that D2D data is transmitted. In this case, all four D2D communication resources may not overlap. That is, the first terminal and the second terminal can transmit D2D data using all four allocated D2D communication resources.

11 is a conceptual diagram illustrating a sub-RPT-based data transmission method according to an embodiment of the present invention.

In FIG. 11, a sub-RPT-based data transmission method is published based on a plurality of sub-RPTs constituting one RPT.

The RPT may include a plurality of sub-RPTs of different patterns. For example, the RPT may include a first sub-RPT and a second sub-RPT, or may include a second sub-RPT and a third sub-RPT.

RPT can be defined in four D2D communication resources among eight D2D communication candidate resources. When the RPT is defined as shown in FIG. 10, collision between at least one D2D communication resource and at most two D2D communication resources may occur, based on the RPT. That is, the terminal can transmit D2D data through at least two and at most three D2D communication resources.

As a specific example, if the first terminal transmits D2D data through the D2D communication resource based on the first RPT (first sub-RPT + second sub-RPT) 1110 and the second terminal transmits the second RPT (second sub-RPT + RPT) 1120, a third RPT (third sub-RPT + fourth sub-RPT) 1130 or a fifth RPT (fifth sub-RPT + sixth sub-RPT) Can be assumed. In this case, two D2D communication resources among the four D2D communication resources are overlapped, and two D2D communication resources may not overlap. That is, the first terminal and the second terminal can transmit D2D data through two D2D communication resources.

As another example, if the first terminal transmits D2D data based on the first RPT (first sub-RPT + first sub-RPT) 1110 and the second terminal transmits the fourth RPT (fourth sub-RPT + fifth sub-RPT) 1140 ) Or the sixth RPT (the sixth sub RPT + the first sub RPT) 1160. In this case, In this case, one D2D communication resource among the four D2D communication resources is overlapped, and three D2D communication resources may not overlap. That is, the first terminal and the second terminal can transmit D2D data through three D2D communication resources.

11, the number of D2D communication resources that can transmit the maximum is decreased, but the number of RPTs that can secure D2D communication resources that can transmit the maximum is increased as compared with FIG.

In the case of using the method disclosed in FIGS. 9 to 11, the number of RPTs available for each TB is guaranteed in consideration of the situation of D2D communication in comparison with the RPT-based transmission method of FIG. 6, It may not be. When using the method disclosed in FIGS. 9 to 11, signaling overhead for indicating RPT can be reduced by not defining unnecessarily many RPTs as compared with the RPT-based transmission method of FIG.

Also, in the prior art, maximum (N / 2-1) collisions may occur in the RPT, whereas the D2D communication resources of the RPT according to the embodiment of the present invention may include D2D communication resources of other RPTs and up to N / D2D communication resources. From a transmission point of view, a terminal can transmit D2D data without collision through at least N / 4 and N / 2 D2D communication resources.

As described above, the sub-RPT-based D2D communication resources may be plural. The same TB can be repeatedly transmitted through each of the plurality of D2D communication resources based on the sub RPT. In other words, each of the plurality of D2D communication resources based on the sub RPT can repeatedly transmit the same TB. That is, only one TB including the same data (for example, D2D data) can be transmitted through one sub-RPT-based D2D communication resource and different data can be transmitted through one sub-RPT-based D2D communication resource Lt; RTI ID = 0.0 > TB < / RTI > Of course, a plurality of TBs can be transmitted through an RPT-based D2D communication resource, which is a set of a plurality of sub-RPTs.

As mentioned, TB can be used as a transmission unit of D2D data. In the case of control data, a separate transmission unit called an SA transmission unit can be transmitted through one sub-RPT-based D2D communication resource. Hereinafter, a transmission unit of D2D data transmitted through one sub-RPT-based D2D communication resource is referred to as a D2D data TB, and a transmission unit of control data transmitted through one sub-RPT-based D2D communication resource may be referred to as an SA transmission unit have.

Hereinafter, in the embodiment of the present invention, a method of signaling the information (or sub-RPT information) on the sub-RPT for transmitting the D2D data TB is posted.

12 is a conceptual diagram illustrating a method of signaling sub-RPT information according to an embodiment of the present invention.

The sub-RPT information may be information for indicating a sub-RPT for transferring one of the plurality of sub-RPTs included in the RPT, the D2D data TB (D2D data in TB units). Or in other words the sub-RPT information may be information for indicating a D2D communication resource for transmitting one D2D data TB (D2D data in TB units).

Referring to FIG. 12, the sub-RPT information may include pattern information, start position information, and continuous number information.

일 수 있다. 도 9 내지 도 11의 경우 Ts=6이므로 총 3비트가 필요할 수 있다. The pattern information may include sub-RPT information used to transmit the D2D data TB. In other words, the pattern information may include information for indicating a D2D communication resource for transmitting the D2D data TB. For example, in the above-described Figs. 9 to 11, the first to sixth sub-RPTs are defined as sub-RPTs. In this case, the pattern information may indicate one sub-RPT of the first sub-RPT to the sixth sub-RPT used for transmitting the D2D data TB. Assuming that the total number of patterns for the sub-RPT is Ts, the number of bits required for the pattern information is

Lt; / RTI > In the case of Figs. 9 to 11, since Ts = 6, a total of 3 bits may be required.

The start position information may include information for indicating a specific sub-RPT (or a start sub-RPT) corresponding to the D2D communication resource that started transmission of the D2D data TB.

The start sub-RPT can be indicated based on the number of the entire sub-RPTs constituting the RPT. The entire D2D communication candidate resource on the D2D resource pool can be divided into a plurality of D2D communication candidate resources based on the sub RPT. In other words, the starting sub-RPT is indicated as the D2D communication candidate resource based on the starting sub- RPT among the entire D2D communication candidate resources. .

일 수 있다.That is, a D2D communication candidate resource in which one D2D resource pool is defined can be divided into Ks sub-RPT-based D2D communication candidate resources. In another expression, one RPT can be divided into a total of Ks sub-RPTs. Therefore, the total number of bits required to indicate the start sub-RPT in one D2D resource pool is

Lt; / RTI >

In the case of the top of Fig. 12, Ks = 8. Therefore, since the number of start sub-RPTs is eight, the number of bits for the start position information can be three bits in total. In the case of the bottom of Fig. 12, Ks = 4. Therefore, since there are four numbers in the case of the start sub-RPT, the number of bits for the start position information may be two bits in total.

The successive count information may include information on the number of sub-RPTs used to transmit the same D2D data TB.

The consecutive count information may include information on the number of sub-RPTs corresponding to D2D communication resources that transmit the same D2D data TB, including the starting sub-RPT corresponding to the D2D communication resource that started transmission of the D2D data TB.

일 수 있다.The number of sub-RPTs included in one RPT is Ks, the number of sub-RPTs corresponding to the D2D communication resource that transmits the same D2D data TB is 2 (for example, 1, 2, 4, 8) , The total number of bits required for the continuous count information is

Lt; / RTI >

In the case of the top of Fig. 12, Ks = 8. Accordingly, the continuous number information may be 1, 2, 4, or 8, and the total number of bits required for the continuous number information may be a total of 2 bits.

12, KS = 4. Therefore, the continuous number information may be 1, 2, or 4, and the total number of bits required for the continuous number information may be a total of 2 bits.

The sub-RPT information (pattern information, start position information, serial number information) may be signaled by various methods.

13 is a conceptual diagram illustrating a method of transmitting sub-RPT information according to an embodiment of the present invention.

The top of FIG. 13 posts how sub-RPT information is delivered in the case of D2D communication (first mode communication) within network coverage. In the first mode communication, the base station can determine the sub-RPT information.

Referring to the upper part of FIG. 13, a base station (or rel-10 relay node) 1300 may transmit sub-RPT information of the first terminal 1310 to the first terminal. For example, the base station 1300 may transmit sub-RPT information (pattern information, start position information, and serial number information) for the first terminal 1310 to the first terminal 1310. The base station 1300 may transmit the sub-RPT information to the first terminal 1310 in various manners. For example, the sub-RPT information may be sent to the UE in higher layer signaling, such as radio resource control (RRC) signaling, DCI-based signaling that is explicit or implicit.

The sub-RPT information determined by the base station 1300 can be expressed by the term sub-RPT grant information. The sub-RPT grant information for the first terminal 1310 may include sub-RPT information for the D2D communication of the first terminal 1310.

The first terminal 1310 may transmit the received sub-RPT approval information to the second terminal 1320. The first terminal 1310 may transmit the D2D data TB based on the sub-RPT grant information. The second terminal 1320 can also receive the D2D data TB from the first terminal 1310 based on the received sub-RPT grant information.

The first terminal 1310 may transmit the sub-RPT information to the second terminal 1320 in various manners. For example, the sub-RPT information may be explicitly transmitted to the second terminal via the SA or may be transmitted to the second terminal 1320 based on implicit signaling.

That is, in the first mode communication, the sub-RPT information transmitted from the first terminal 1310 to the second terminal 1320 via the SA may be information determined by the base station 1300. [

The bottom of FIG. 13 posts how sub-RPT information is delivered in case of D2D communication (second mode communication) outside the network coverage. In the case of D2D communication (first mode communication) within the network coverage, the sub-RPT information is generally transmitted in the manner referred to at the top of FIG. 13, but may also be delivered in the manner mentioned at the bottom of FIG. 13 have.

Referring to the bottom of FIG. 13, the third terminal 1330 can construct and transmit an SA by itself. If there is a third terminal 1330 outside the coverage of the base station, the third terminal 1330 can directly determine the sub-RPT information and transmit the determined information to the fourth terminal 1340. The third terminal 1330 may transmit the D2D data TB to the fourth terminal 1340 based on the sub-RPT information. The fourth terminal 1340 may also receive the D2D data TB from the third terminal 1330 based on the received sub-RPT information.

The third terminal 1330 may transmit the sub-RPT information to the fourth terminal 1340 in various manners. For example, the sub-RPT information may be explicitly transmitted to the fourth terminal via the SA or may be transmitted to the fourth terminal 1340 based on implicit signaling.

That is, in the second mode communication, the sub-RPT information transmitted from the third terminal 1330 to the fourth terminal 1340 via the SA may be information directly determined by the third terminal 1330.

Hereinafter, a method of signaling sub-RPT information will be specifically described in the embodiment of the present invention.

The first signaling method may transmit sub-RPT information via the SA.

일 수 있다.In the first signaling method, pattern information, start position information, and serial number information can all be signaled explicitly via SA. The number of bits of the SA for transmitting the pattern information, the start position information and the continuous number information is

Lt; / RTI >

If Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 8 as in the case of the upper part of FIG. 12, the total number of bits may be 3 bits + 3 bits + 2 bits = 8 bits. In the case of Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 4 as in the case of the lower end of FIG. 12, the total number of bits may be 3 bits + 2 bits + 2 bits = 7 bits.

The second signaling method transmits sub-RPT information through the SA, and only the start position information and the consecutive count information excluding the pattern information can be explicitly signaled through the SA.

 The pattern information may be implicitly (or implicitly) indicated by the UE ID transmitted via the SA. That is, the sub-RPT used by the terminal may be predefined according to the terminal identifier.

For example, the sub-RPT (i.e., the pattern information) used for transmitting the D2D data TB may be determined by the sub-RPT index (sub-RPT index) = (decimal conversion value of UE ID) mod . That is, the identifier information of the terminal is converted into a decimal number, and the identifier information of the terminal converted into a decimal number is mode-operated to Ts to indicate the sub-RPT for transmitting the D2D data TB.

일 수 있다. 즉, 시작 위치 정보, 연속 개수 정보를 위한

개의 비트가 SA를 통해 전송될 수 있다.The number of bits used for starting position information and continuous number information excluding the pattern information is

Lt; / RTI > That is, for starting position information and continuous number information

Bits may be transmitted via the SA.

12, when Ks = 8, the total number of bits for transmitting the start position information and the serial number information via the SA is calculated as follows: start position information (3 bits) + consecutive count information (2 bits) = 5 bits .

As shown in the lower part of FIG. 12, when Ks = 4, the total number of bits for transmitting the starting position information and the continuous count information via the SA is calculated as follows: start position information (2 bits) + consecutive count information .

In the third signaling method, sub-RPT information is transmitted through SA, but only pattern information and start position information excluding consecutive number information can be explicitly signaled through SA.

)를 기반으로 내재적으로 지시될 수 있다. 패턴 정보 및 시작 위치 정보가 SA를 통해 미리 지시된다면 단말은 D2D 데이터 TB에 대한 DM-RS의 매핑 위치를 알 수 있다. 따라서, 연속 개수 정보는 DM-RS를 생성하는데 사용된 CS를 통해 지시될 수 있다.The serial number information may be indicated based on a reference signal (e.g., DM-RS) used to decode the D2D data TB when transmitting the D2D data TB. For example, the successive count information may include information related to a cyclic shift (CS) used to generate the DM-RS (e.g.,

) Can be implicitly indicated. If the pattern information and the start position information are designated in advance via the SA, the UE can know the mapping position of the DM-RS with respect to the D2D data TB. Thus, the serial number information can be indicated via the CS used to generate the DM-RS.

를 기반으로 연속 개수 정보가 지시될 수 있다.

는 DM-RS에 대한 CS를 결정하기 위한 변수일 수 있다.In the case of the top of Fig. 12, Ks = 8. Accordingly, the continuous number information may be one of 1, 2, 4, and 8.

The continuous number information may be indicated.

May be a variable for determining the CS for the DM-RS.

<Table 1>

의 값(0, 6, 3, 9) 각각에 대응될 수 있다.Referring to Table 1, the serial number information (Ks = 8) 1, 2, 4, and 8

(0, 6, 3, 9), respectively.

<Table 2>

의 값(0, 6, 3) 또는 (0, 4, 8) 각각에 대응될 수 있다.Referring to Table 2, the serial number information (Ks = 4) 1, 2 and 4

(0, 6, 3) or (0, 4, 8), respectively.

일 수 있다. The total number of bits indicating the pattern information and the start position information is

Lt; / RTI &gt;

In case of Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 8 as in the case of FIG. 12, the total number of bits may be 3 bits (pattern information) +3 bits (starting position information) = 6 bits.

In the case of Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 4 as in the case of FIG. 12, the total number of bits can be 3 bits (pattern information) +2 bits (start position information) = 5 bits.

The fourth signaling method can explicitly signal only the start position information via the SA through the SA.

The pattern information may be indicated by the UE ID information (UE ID) as described above. For example, the pattern information may be determined by a sub-RPT index (sub-RPT index) = (decimal conversion value of UE ID) mod (Ts).

The consecutive number information may be determined based on the CS value of the DM-RS for the data TB as described above.

일 수 있다. The total number of bits for transmitting information about the starting position is

Lt; / RTI &gt;

In the case of the top of FIG. 12, Ks = 8. Therefore, the total number of bits for transmitting the information on the start position may be 3 bits.

In the case of the bottom of Fig. 12, Ks = 4. Therefore, the total number of bits for transmitting the information on the start position may be 2 bits.

RPT information for transmitting D2D data TB based on information other than pattern information, start position information, and serial number information. Hereinafter, a method of indicating sub-RPT information based on pattern information and sub-RPT allocation information will be described in the embodiment of the present invention. The sub-RPT allocation information may be information on the sub-RPT allocation on the D2D resource pool used to transfer one D2D data TB.

14 is a conceptual diagram illustrating allocation of sub-RPTs on a D2D resource pool according to an embodiment of the present invention.

In FIG. 14, when Ks = 8, the sub-RPT for transmitting the D2D data TB on the D2D resource pool is posted. When Ks = 8, the D2D resource pool can be divided into eight sub-RPTs. In other words, if Ks = 8, one RPT may contain eight sub-RPTs.

The allocation # 0 (allocation # 0) is for Ka = 8. Ka is the number of sub-RPTs used to transmit one D2D data TB as described above. When Ka = 8, the same D2D data TB can be repeatedly transmitted in each of the eight sub-RPTs. That is, the specific D2D data TB can be repeatedly transmitted through eight sub-RPTs. This means that one D2D data TB is allocated and defined on the D2D communication resource based on one sub-RPT, which is repeatedly transmitted eight times through eight sub-RPTs.

Assignment # 1 through Assignment # 2 are for Ka = 4. When Ka = 4, the same D2D data TB can be repeatedly transmitted in each of the four sub-RPTs.

Assignment # 3 through Assignment # 6 are for Ka = 2. When Ka = 2, the same D2D data TB can be repeatedly transmitted in each of the two sub-RPTs.

Assignment # 7 through Assignment # 14 are for Ka = 1. When Ka = 1, the D2D data TB can be transmitted in one sub-RPT.

15 is a conceptual diagram illustrating allocation of sub-RPTs in a D2D resource pool according to an embodiment of the present invention.

In FIG. 15, when Ks = 4, the sub-RPT for transmitting the D2D data TB on the D2D resource pool is posted. When Ks = 4, the D2D resource pool can be divided into four sub-RPTs. If Ks = 4 in another expression, one RPT may contain four sub-RPTs.

The allocation # 0 (allocation # 0) is for Ka = 8. When Ka = 4, the same D2D data TB can be repeatedly transmitted in each of the four sub-RPTs.

Assignment # 1 to Assignment # 2 are for Ka = 2. When Ka = 2, the same D2D data TB can be repeatedly transmitted in each of the two sub-RPTs.

Assignment # 3 through Assignment # 6 are for Ka = 1. When Ka = 1, the D2D data TB can be transmitted in one sub-RPT.

+1일 수 있다.The assignments # 0 to # 14 in FIG. 14 and the assignments # 0 to # 6 in FIG. 15 can be used to indicate sub-RPT assignment information. The sub-RPT allocation information may be information on the sub-RPT allocation on the D2D resource pool used to transfer one D2D data TB. 14 or 15, the number of sub-RPTs is Ks, and the number of bits used for transmitting sub-RPT allocation information is

+1. &Lt; / RTI &gt;

In the case of FIG. 14, since Ks = 8, there are 15 cases and a total of 4 bits are required. In FIG. 15, since Ks = 4, there are a total of 7 cases and a total of 3 bits may be required.

(패턴 정보)+

+1(서브 RPT 할당 정보)일 수 있다. The fifth signaling method can explicitly transmit the pattern information and the sub-RPT allocation information through the SA. Therefore, the total number of bits for the pattern information included in the SA and the sub-RPT allocation information is

(Pattern information) +

+1 (sub-RPT allocation information).

In the case of Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 8 as in the case of FIG. 14, the total number of bits may be 3 bits (pattern information) +4 bits (sub-RPT allocation information) = 7 bits.

In the case of Ts = 6 as in the case of FIGS. 9 to 11 and Ks = 4 as in the case of FIG. 15, the total number of bits may be 3 bits (pattern information) +3 bits (sub-RPT allocation information) = 6 bits.

The sixth signaling method can explicitly transmit only the sub-RPT allocation information through the SA.

+1일 수 있다. The pattern information may be indicated based on the terminal identifier. For example, the pattern information may be determined by a sub-RPT index (sub-RPT index) = (decimal conversion value of UE ID) mod (Ts). Therefore, the number of bits for the sub-RPT allocation information included in the SA is

+1. &Lt; / RTI &gt;

14, when Ks = 8, the total number of bits is 4, and when Ks = 4 as in the case of FIG. 15, the total number of bits may be 3 bits.

In FIGS. 8 to 15, a method of transmitting the D2D data TB based on the sub-RPT is described. Alternatively, one RPT-based D2D communication resource may be used to transmit one D2D data TB.

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

Referring to FIG. 16, one D2D resource pool can be divided into a plurality of RPTs. For example, one D2D resource pool can be partitioned based on Kp RPTs.

One RPT can be defined on Lp D2D communication candidate resources. Thus, one D2D resource pool can be composed of a total of Nr = Lp? Kp D2D communication candidate resources.

Similarly, one D2D communication candidate resource may correspond to A (e.g., one or two) subframes. When A is 1, one subframe is one D2D communication candidate resource, and when A is 2, two subframes may be one D2D communication candidate resource.

B-1 subframes may be located between the next communication candidate resource after one communication candidate resource. That is, the second communication candidate resource may be located after the (B-1) th sub-frame after the first communication candidate resource. (For example, B = 5) when considering the assumption of the uplink decoding time of the PUSCH in the existing LTE system. The value of B may be pre-configured and signaled considering the length of the D2D resource pool, or it may be pre-defined on the specification.

For example, in FIG. 16, one D2D resource pool is defined on 160 subframes (160 ms), and A = 1, B = 5, Lp = 8, Kp = 4, and Nr = 32.

As another example, one D2D resource pool is defined on 160 subframes (160 ms), and A = 1, B = 5, Lp = 4, Kp = 8, NR = 32. As another example, one D2D resource pool is defined on 80 subframes (80ms), and A = 1, B = 5, Lp = 4, Ks = 4, Nr = 16.

One D2D data TB may be transmitted through Ka RPT based D2D communication resources. At this time, the D2D data TB can be transmitted through Ma D2D communication resources among Na (Lp * Ka) D2D communication candidate resources.

In FIG. 16, when Ka = 4, D2D data can be transmitted through 16 D2D communication resources (Ma = 16) among 32 D2D communication candidate resources (Na = 32).

In FIG. 16, when Ka = 2, D2D data (Ma = 8) can be transmitted through eight D2D communication resources among 16 D2D communication candidate resources (Na = 16).

In FIG. 16, when Ka = 1, D2D data can be transmitted through four D2D communication resources (Ma = 4) among eight D2D communication candidate resources (Na = 8).

17 is a conceptual diagram illustrating a method of signaling RPT information according to an embodiment of the present invention.

Referring to FIG. 17, the RPT information may include RPT pattern information, RPT start position information, and RPT continuous number information.

일 수 있다.The RPT pattern information may include information on the RPT used to transmit the D2D data TB. In another expression, the RPT pattern information may include information for indicating a D2D communication resource for transmitting the D2D data TB. For example, when the first RPT to the sixth RPT are defined by the RPT, the RPT pattern information may indicate one RPT of the first RPT to the sixth RPT. If the total number of patterns for the RPT is Tp, the number of bits required for the RPT pattern information is

Lt; / RTI &gt;

The RPT start position information may include information for indicating a start RPT corresponding to the D2D communication resource that started transmission of the D2D data TB.

The starting RPT can be indicated based on the number of total RPTs constituting the D2D resource pool. The starting RPT may be indicated as the starting RPT-based D2D communication candidate resource among the entire D2D communication candidate resources of the D2D resource pool.

일 수 있다.That is, the D2D communication candidate resources defined in one D2D resource pool can be divided into Kp RPT based D2D communication candidate resources. In another term, one RPT can be divided into a total of Kp RPTs. Therefore, the total number of bits required to indicate the start sub-RPT in one D2D resource pool is the number of bits

Lt; / RTI &gt;

In the case of Kp = 8 as shown in the upper part of FIG. 17, since there are a total of 8 cases in the case of the start RPT, a total of 3 bits may be required for the number of bits for the RPT start position information.

If Kp = 4 as shown in the lower part of FIG. 17, since there are four cases in the case of the start RPT, the total number of bits for the RPT start position information may be 2 bits.

The RPT successive count information may include information on the number of RPTs corresponding to D2D communication resources that transmit the same D2D data TB, including the starting RPT corresponding to the D2D communication resource that started transmission of the D2D data TB.

일 수 있다.When the number of RPTs defined in one D2D resource pool is Kp and the number of RPTs corresponding to D2D communication resources transmitting the same D2D data TB is 2 (e.g., 1, 2, 4, 8) , The total number of bits required for the RPT continuous count information is

Lt; / RTI &gt;

In the case of Kp = 8 as shown in the upper part of FIG. 17, the RPT continuous number information may be 1, 2, 4, or 8, and the total number of required bits for the RPT continuous number information may be 2 bits in total.

17, when Kp = 4, the RPT consecutive number information may be 1, 2, or 4, and the total number of bits required for the RPT consecutive number information may be a total of 2 bits.

The above RPT information (pattern information, start position information, serial number information) can be signaled in various ways.

13, the base station 1300 may transmit RPT information to the first terminal 1310 in various manners. For example, the RPT information may be sent to the terminal with higher layer signaling, such as radio resource control (RRC) signaling, DCI-based signaling that is explicit or implicit.

13, the first terminal 1310 may transmit the RPT information scheduled and determined by the base station 1300 to the second terminal 1320 in various manners. For example, the RPT information may be explicitly transmitted to the second terminal 1320 via the SA, or may be transmitted to the second terminal 1320 based on the implicit signaling.

13, the third terminal 1330 can transmit the determined RPT information to the fourth terminal 1340 in various manners. For example, the RPT information may be explicitly transmitted to the fourth terminal 1340 via the SA or may be transmitted to the fourth terminal 1340 based on the implicit signaling.

Hereinafter, a method of signaling the RPT information will be specifically described in the embodiment of the present invention.

The seventh signaling method can transmit the RPT information through the SA.

일 수 있다.The RPT pattern information, the RPT start position information, and the RPT consecutive number information can all be transmitted through the SA with explicit signaling. The number of bits of the SA for transmitting the RPT pattern information, the RPT start position information, and the RPT continuous number information is

Lt; / RTI &gt;

Tp = 6 and Kp = 4, the total number of bits of the SA for seventh signaling may be 3 bits + 2 bits + 2 bits = 7 bits. When Tp = 6 and Kp = 8, the total number of bits of the SA for seventh signaling may be 3 bits + 3 bits + 2 bits = 8 bits.

The eighth signaling method transmits RPT information through the SA. However, only the RPT start position information excluding the RPT pattern information and the RPT continuous number information can be explicitly signaled through the SA. The RPT pattern information may be implicitly indicated by the UE ID transmitted through the SA. That is, the RPT used for transmitting the D2D data TB by the terminal according to the terminal identifier may be predefined. For example, the RPT (i.e., RPT pattern information) used for transmitting the D2D data TB can be determined by the RPT index (RPT index) = (decimal conversion value of UE ID) mod (Tp). That is, the RPT for transmitting the D2D data TB can be indicated based on the value obtained by converting the identifier information of the terminal into decimal numbers and performing Tp-based mode operation on the identifier information of the terminal converted into decimal numbers.

일 수 있다.The RPT start position information excluding the RPT pattern information, the number of bits used for transmitting the RPT continuous number information is

Lt; / RTI &gt;

개의 비트가 SA를 통해 RPT 시작 위치 정보, RPT 연속 개수 정보를 전달하기 위해 사용될 수 있다.

Bits may be used to convey RPT start position information, RPT sequence number information via SA.

When Kp = 4, the total number of bits of SA for eighth signaling is 2 bits + 2 bits = 4 bits and Kp = 8, the total number of SAs for eighth signaling is 3 bits + 2 bits = 5 bits.

The ninth signaling method transmits RPT information through the SA, and only the RPT pattern information excluding the RPT consecutive count information and the RPT start position information can be explicitly signaled through the SA.

)를 기반으로 내재적으로 지시될 수 있다. RPT 패턴 정보 및 RPT 시작 위치 정보가 SA를 통해 미리 지시된다면 D2D 데이터 TB에 대한 DM-RS가 매핑되는 정확한 위치를 알 수 있다. 따라서, RPT 연속 개수 정보는 DM-RS를 생성하는데 사용된 CS를 통해 지시될 수 있다.The RPT successive count information may be indicated based on a reference signal (e.g., DM-RS) used to decode the D2D data TB when transmitting the D2D data TB. For example, the RPT successive count information may include information related to the cyclic shift (CS) used to generate the DM-RS (e.g.,

) Can be implicitly indicated. If the RPT pattern information and the RPT start position information are indicated in advance through the SA, the exact position where the DM-RS of the D2D data TB is mapped can be known. Thus, the RPT consecutive number information may be indicated via the CS used to generate the DM-RS.

를 기반으로 RPT 연속 개수 정보가 지시될 수 있다.

는 DM-RS에 대한 CS를 결정하기 위한 변수일 수 있다.In the case of the top of Fig. 17, Kp = 8. Accordingly, the continuous number information may be one of 1, 2, 4, and 8.

The RPT continuous count information may be indicated.

May be a variable for determining the CS for the DM-RS.

<Table 3>

의 값(0, 6, 3, 9) 각각에 대응될 수 있다.Referring to Table 3, the numbers 1, 2, 4, and 8 of the RPT continuous count information (Kp = 8)

(0, 6, 3, 9), respectively.

<Table 4>

의 값(0, 6, 3) 또는 (0, 4, 8) 각각에 대응될 수 있다.Referring to Table 4, the RPT consecutive count information (Ks = 4) 1, 2, and 4

(0, 6, 3) or (0, 4, 8), respectively.

일 수 있다. The total number of bits indicating RPT pattern information and RPT start position information is

Lt; / RTI &gt;

When Tp = 6 and Kp = 4, the total number of bits can be 3 bits (RPT pattern information) +2 bits (RPT start position information) = 5 bits. When Tp = 6 and Kp = 8, the total number of bits can be 3 bits (RPT pattern information) and +3 bits (RPT start position information) = 6 bits.

The tenth signaling method can explicitly signal only the RPT start position information via the SA through the SA.

The RPT pattern information can be indicated by the UE ID information (UE ID) as described above. For example, the RPT pattern information may be determined by an RPT index (sub-RPT index) = (decimal conversion value of UE ID) mod (Ts).

The RPT successive count information may be determined based on the CS value of the DM-RS for the D2D data TB as described above.

일 수 있다.The total number of bits for transmitting the RPT start position information is

Lt; / RTI &gt;

That is, when Kp = 4, when the total number of bits of the SA for transmitting the RPT start position information is 2 bits and Kp = 8, the total number of bits of the SA for transmitting the RPT start position information may be 3 bits .

RPT information for transmitting the D2D data TB on the basis of the RPT pattern information, the RPT start position information, and other information other than the RPT continuous number information. Similar to the fifth signaling method and the sixth signaling method disclosed in FIGS. 14 and 15, RPT information for transmitting D2D data TB may be indicated based on RPT pattern information and RPT allocation information.

+1일 수 있다.That is, RPT allocation information, which is information on the RPT allocation on the D2D resource pool used to transmit one D2D data TB, can be defined. When the number of RPTs in the D2D resource pool is Kp, the number of bits used to transmit the RPT allocation information is

+1. &Lt; / RTI &gt;

(패턴 정보)+

+1(RPT 할당 정보)일 수 있다. The eleventh signaling method may explicitly transmit the RPT pattern information and the RPT allocation information through the SA. Therefore, the total number of bits for the RPT pattern information and the RPT allocation information included in the SA is

(Pattern information) +

+1 (RPT allocation information).

The twelfth signaling method can explicitly transmit only the RPT allocation information through the SA.

+1일 수 있다.
The RPT pattern information may be indicated based on the terminal identifier. For example, the pattern information may be determined by an RPT index (RPT index) = (decimal conversion value of UE ID) mod (Ts). Therefore, the number of bits for the RPT allocation information included in the SA is

+1. &Lt; / RTI &gt;

The RPT-based D2D communication resource allocation on the above-mentioned D2D resource pool relates to resource allocation on the time domain. Therefore, signaling information (resource block allocation information on the frequency axis, hopping pattern information on the frequency axis) for resource allocation on the frequency axis may be additionally transmitted via the SA.

The resource block allocation information on the frequency axis may include information on the number and position of resource blocks on the frequency domain for transmitting the SA transmission unit or the D2D data TB. The resource block allocation information on the frequency axis may vary depending on the system bandwidth.

The hopping pattern information on the frequency axis may include information on the hopping pattern of the resource block on the frequency domain for transmitting the SA transmission unit or the D2D data TB. The frequency hopping pattern information may indicate a position change pattern on the frequency of the resource block for transmitting the SA transmission unit or the D2D data TB.

18 is a flowchart illustrating a method of transmitting D2D communication data according to an embodiment of the present invention.

In FIG. 18, the first terminal posts a method of transmitting D2D data through a sub-RPT-based D2D communication resource.

The first terminal transmits the sub-RPT information for transmitting the D2D data in units of TB to the second terminal (step S1800).

The sub-RPT information may include information about the at least one D2D communication resource for transmitting D2D data. For example, the sub-RPT information may include pattern information, start position information, and serial number information. The pattern information includes information for indicating at least one D2D communication resource, and the starting position information includes information on a starting sub-RPT corresponding to a D2D communication resource that starts transmission of D2D data among at least one sub-RPT , And the continuous number information may include information on the number of at least one sub-RPT. As described above, the sub-RPT information may include the pattern information and the sub-RPT allocation information. At least one piece of information included in the sub-RPT information may be transmitted explicitly or implicitly as described above.

The first terminal transmits D2D data to the second terminal on at least one sub-RPT-based at least one D2D communication resource (step S1810).

At least one sub-RPT constitutes an RPT, and each of the at least one sub-RPT may indicate the at least one D2D communication resource for transmitting only the D2D data among a plurality of D2D communication candidate resources.

Although FIG. 18 shows a method of transmitting a D2D data based on a sub-RPT, the RPT-based D2D data transmission may be performed as described above.

The first terminal may receive the second D2D data of the TB unit from the second terminal on the remaining D2D communication candidate resources excluding the at least one D2D communication resource among the plurality of D2D communication candidate resources.

19 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.

19, a terminal 1900 includes an RF unit (radio frequency unit) 1905, a processor 1910, and a memory 1915. [ The memory 1915 is coupled to the processor 1910 and stores various information for driving the processor 1910. The RF unit 1905 is connected to the processor 1910 to transmit and / or receive wireless signals. For example, the RF unit 1905 may transmit sub-RPT information (or RPT information), D2D data, or control data to another terminal.

Processor 1910 implements the proposed functionality, process and / or method. Specifically, the processor 1910 performs all the steps according to FIGS. 8-18. For example, the processor 1910 may transmit sub-RPT information (or RPT information) for transmitting D2D data in units of TB to another terminal, and may transmit at least one sub-RPT (or RPT) D2D data may be transmitted to another terminal on at least one D2D communication resource. In all embodiments of the present disclosure, the operation of terminal 1900 may be implemented by processor 1910. [

The memory 1915 may perform operations to generate D2D data or control data in accordance with the present disclosure.

The base station 1950 includes a processor 1955, a memory 1960, and a RF unit (radio frequency) unit 1965. Memory 1960 is coupled to processor 1955 to store various information for driving processor 1955. RF section 1965 is coupled to processor 1955 to transmit and / or receive wireless signals. Processor 1955 implements the proposed functionality, process and / or method. The operation of the base station in the above-described embodiment may be implemented by processor 1955. [ Processor 1855 may send D2D authorization information to the terminal as published herein.

The processor may comprise an application-specific integrated circuit (ASIC), other chipset, logic circuitry and / or a data processing device. The 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 the radio signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module is stored in memory and can be executed by the processor. The memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (12)

A method for transmitting control data in a D2D (device to device) communication,
Transmitting, by the first terminal, sub-RPT (resource pattern for transmission) information for transmitting D2D data in transport block (TB) to the second terminal; And
The first terminal transmitting the D2D data to the second terminal on at least one sub-RPT based at least one D2D communication resource,
Wherein the sub-RPT information includes information on the at least one D2D communication resource for transmitting the D2D data,
Wherein the at least one sub-RPT constitutes an RPT,
Wherein each of the at least one sub-RPT indicates the at least one D2D communication resource for transmitting only the D2D data among a plurality of D2D communication candidate resources. The method according to claim 1,
The sub-RPT information includes pattern information, start position information, and consecutive number information,
Wherein the pattern information includes information for indicating the at least one D2D communication resource,
The start position information includes information on a start sub-RPT corresponding to a D2D communication resource that starts transmission of the D2D data among the at least one sub-RPT,
Wherein the continuous number information includes information on the number of the at least one sub-RPT. 3. The method of claim 2,
Wherein at least one of the pattern information and the continuous number information is implicitly signaled,
When the pattern information is implicitly signaled, the pattern information is signaled based on the identifier information of the first terminal,
Wherein when the consecutive number information is implicitly signaled, the consecutive number information is signaled based on a reference signal for the D2D data. The method according to claim 1,
The sub-RPT information includes pattern information and sub-RPT allocation information,
Wherein the pattern information includes information for indicating the at least one D2D communication resource,
And the sub-RPT allocation information includes information indicating the sub-RPT for transmitting the D2D data among the plurality of sub-RPTs on the D2D resource pool. 5. The method of claim 4,
The pattern information is implicitly signaled,
And the pattern information is signaled based on the identifier information of the first terminal. The method according to claim 1,
The RPT indicates an entire D2D communication resource for transmitting the entire D2D data on the entire D2D communication candidate resource,
The entire D2D data includes the D2D data,
Wherein the entire D2D communication candidate resource is a set of D2D communication candidate resources defined on the D2D resource pool, and includes the plurality of D2D communication candidate resources,
Wherein the entire D2D communication resource is a collection of D2D communication resources defined on the D2D resource pool and comprises the at least one D2D communication resource. 1. A first terminal for transmitting control data in a D2D (device to device) communication,
A radio frequency (RF) unit adapted to transmit a radio signal; And
And a processor selectively coupled to the RF unit,
The processor transmits sub-RPT (resource pattern for transmission) information for transmitting D2D data in transport block (TB) to the second terminal,
And to transmit the D2D data to the second terminal on at least one sub-RPT based at least one D2D communication resource,
Wherein the sub-RPT information includes information on the at least one D2D communication resource for transmitting the D2D data,
Wherein the at least one sub-RPT constitutes an RPT,
Each of the at least one sub-RPT indicating the at least one D2D communication resource for transmitting only the D2D data among a plurality of D2D communication candidate resources. 8. The method of claim 7,
The sub-RPT information includes pattern information, start position information, and consecutive number information,
Wherein the pattern information includes information for indicating the at least one D2D communication resource,
The start position information includes information on a start sub-RPT corresponding to a D2D communication resource that starts transmission of the D2D data among the at least one sub-RPT,
Wherein the continuous number information includes information on the number of the at least one sub-RPT. 9. The method of claim 8,
Wherein at least one of the pattern information and the continuous number information is implicitly signaled,
When the pattern information is implicitly signaled, the pattern information is signaled based on the identifier information of the first terminal,
Wherein when the consecutive number information is implicitly signaled, the consecutive number information is signaled based on a reference signal for the D2D data. 8. The method of claim 7,
The sub-RPT information includes pattern information and sub-RPT allocation information,
Wherein the pattern information includes information for indicating the at least one D2D communication resource,
Wherein the sub-RPT allocation information includes information indicating the sub-RPT for transmitting the D2D data among a plurality of sub-RPTs on the D2D resource pool. 11. The method of claim 10,
The pattern information is implicitly signaled,
Wherein the pattern information is signaled based on the identifier information of the first terminal. 8. The method of claim 7,
The RPT indicates an entire D2D communication resource for transmitting the entire D2D data on the entire D2D communication candidate resource,
The entire D2D data includes the D2D data,
Wherein the entire D2D communication candidate resource is a set of D2D communication candidate resources defined on the D2D resource pool, and includes the plurality of D2D communication candidate resources,
Wherein the entire D2D communication resource is a collection of D2D communication resources defined on the D2D resource pool and comprises the at least one D2D communication resource.

Images