KR20150128326A

KR20150128326A - Method and apparatus of signaling for d2d communication

Info

Publication number: KR20150128326A
Application number: KR1020140055552A
Authority: KR
Inventors: 박동현
Original assignee: 주식회사 아이티엘
Priority date: 2014-05-09
Filing date: 2014-05-09
Publication date: 2015-11-18

Abstract

The present invention relates to a method for supporting D2D (Device to Device) communication, comprising: receiving D2D communication configuration information from a base station; receiving a D2D SA (Scheduling Assignment) grant from the base station; Based on the configuration information and the D2D SA grant, determining whether the same or different SA is transmitted on the first multiplex transmission opportunity, and determining whether the same or another SA is transmitted based on the D2D SA grant, And transmitting the same or different SAs to the receiving terminal on one multiplex transmission opportunity. According to the present invention, it is possible to support flexible D2D communication and increase the reliability or transmission efficiency of D2D communication.

Description

TECHNICAL FIELD [0001] The present invention relates to a signaling method and apparatus for communication between terminals,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to wireless communication, and more particularly, to a signaling method and apparatus for device to device (D2D) communication.

Device to Device communication (D2D) is a communication method that has been available since the days of analog radios and has a very long history. However, the inter-terminal communication in the wireless communication system is different from the existing inter-terminal communication.

The inter-terminal communication in the wireless communication system uses a transmission / reception technology (for example, a physical channel, etc.) of the wireless communication system in a frequency band of the wireless communication system or other bands but does not go through an infrastructure It means communication that exchanges user data directly between terminals. That is, the two terminals perform communication while being a source and a destination of data, respectively. This provides the advantage of enabling wireless communication in areas other than the limited wireless communication infrastructure and reducing the network load of the wireless communication system.

Direct communication between terminals may be performed using a communication method using a wireless LAN such as IEEE 802.11 or a license-exempt band such as Bluetooth, but it is difficult to provide a planned and controlled service using the communication method using the license-exempt band. In particular, performance can be drastically reduced by interference. On the other hand, the direct communication between the terminals operated or provided in the licensed band or inter-system interference controlled environment can support QoS (Quality of Service), increase frequency utilization efficiency through frequency reuse, The possible distance can be increased.

For inter-terminal communication in such a wireless communication system, signaling for inter-terminal communication must be defined, and related control information must be transmitted from the base station to the Tx terminal. However, current wireless communication systems do not support this.

SUMMARY OF THE INVENTION The present invention provides a signaling method and apparatus for D2D communication.

It is another object of the present invention to provide a method and apparatus for transmitting control information for D2D communication.

It is another object of the present invention to provide a data transmission method and apparatus for D2D communication.

It is another object of the present invention to provide a scheduling method and a control information signaling method and apparatus for D2D transmission.

Another object of the present invention is to provide a method and apparatus for indicating whether a same SA is transmitted or a different SA is transmitted within a multiple Scheduling Assignment (SA) transmission opportunity, .

It is another object of the present invention to provide a method and apparatus for indicating whether one transport block (TB) or multiple TBs are transmitted within multiple data transmission opportunities.

Another object of the present invention is to provide a method and apparatus for allocating data and control information in D2D communication.

According to an aspect of the present invention, there is provided a method for supporting D2D (Device to Device) communication performed by a terminal. The method includes receiving D2D communication configuration information from a base station, receiving a D2D SA (Scheduling Assignment) grant from the base station, receiving the D2D communication configuration information and a first multiplex transmission opportunity based on the D2D SA grant Determining whether the same or different SAs are transmitted on the first multiplex transmission opportunity and transmitting the same or different SAs to the receiving terminal on the first multiplex transmission opportunity based on the determination as to whether the same or another SA is transmitted The method comprising the steps of:

According to another aspect of the present invention, there is provided a terminal supporting D2D (Device to Device) communication. Wherein the terminal comprises: an RF unit for receiving D2D communication configuration information from a base station and for receiving a D2D SA (Scheduling Assignment) grant; and an RF unit for receiving the D2D SA configuration grant and the D2D communication configuration information, Wherein the RF unit transmits the same or another SA to the receiving terminal on the first multiplex transmission opportunity based on the determination as to whether the same or different SA is transmitted, .

According to another aspect of the present invention, there is provided a method for supporting D2D (Device to Device) communication performed by a terminal. The method includes receiving D2D communication configuration information from a base station, receiving a D2D SA (Scheduling Assignment) grant from the base station, receiving a D2D data grant from the base station, Transmitting a SA to a receiving terminal on a first multiplex transmission opportunity based on a D2D SA grant, transmitting a single or multiple transport block (TB) on a second multiplex transmission opportunity based on the D2D communication configuration information and the D2D data grant And transmitting a single or multiple TB on the second multiplex transmission opportunity to the receiving terminal based on the determination as to whether the single or multiple TB is transmitted.

According to another aspect of the present invention, there is provided a terminal supporting D2D (Device to Device) communication. The terminal includes an RF unit for receiving D2D communication configuration information, a D2D SA (Scheduling Assignment) grant and a D2D data grant from the base station, and an RF unit for receiving the D2D communication configuration information and the related parameters for D2D communication based on the D2D SA grant Wherein the processor is configured to determine whether a single or multiple transport block (TB) is transmitted on a second multiplex transmission opportunity based on the D2D communication configuration information and the D2D data grant, Transmitting an SA to a receiving terminal on a first multiplex transmission opportunity and transmitting a single or multiple TB on the second multiplex transmission opportunity to the receiving terminal based on a determination as to whether the single or multiple TB is transmitted .

According to the present invention, it is possible to efficiently support D2D communication. Also, according to the present invention, it is possible to instruct the transmission of the same SA or other SAs to the multi-SA transmission opportunity, so that it is possible to support flexible D2D communication and increase the reliability or transmission efficiency of the corresponding control information. In addition, according to the present invention, transmission of a single TB or multiple TBs can be instructed to multiple data transmission opportunities, so that flexible D2D communication can be supported and the reliability or transmission efficiency of the data can be enhanced.

1 shows a wireless communication system to which the present invention is applied.
2 and 3 schematically show the structure of a radio frame applied to the present invention.
4 is a diagram for explaining the concept of a cellular network-based D2D communication applied to the present invention.
5 to 8 show examples of D2D communication performed in the Tx terminal.
9 to 12 show other examples of D2D communication performed in the Tx terminal.
13 shows another example of D2D communication performed in the Tx terminal.
FIG. 14 is an example of a flowchart illustrating a signaling method for D2D communication according to the present invention.
15 is an example of a block diagram illustrating a wireless communication system supporting D2D communication according to the present invention.

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 numerals even though 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.

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (evolved-NodeB, eNB). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). The cell may again be divided into multiple regions (referred to as sectors).

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. The base station 11 may be referred to by other terms such as a base station (BS), a base transceiver system (BTS), an access point, a femto base station, a home node B, and a relay. Cells are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

Hereinafter, downlink (DL) refers to communication from the base station 11 to the terminal 12, and uplink (UL) refers to communication from the terminal 12 to the base station 11. 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 are no restrictions on multiple access schemes applied to wireless communication systems. (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. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

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.

The physical layer is connected to a MAC layer (Media Access Control) layer through a transport channel. The data is transmitted between the MAC layer and the physical layer through a transmission channel. The transport channel is classified according to how the data is transmitted over the air interface. Further, data is transmitted through physical channels between different physical layers (i.e., between the physical layer of the terminal and the base station). The physical channel can be modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time, frequency, and space generated by a plurality of antennas as radio resources.

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

Referring to FIG. 2 and FIG. 3, one radio frame includes ten subframes, and one subframe includes two consecutive slots. A basic time (length) unit for transmission control in a radio frame is referred to as a transmission time interval (TTI). The TTI may be 1ms. The length of one subframe (1 subframe) is 1 ms, and the length of one slot may be 0.5 ms.

A slot may comprise a plurality of symbols in the time domain. For example, in a wireless system using OFDMA in a downlink (DL), the symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and in an uplink (UL) In the case of a wireless 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 in the time domain is not limited by the multiple access scheme or 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 element (RE) represents a smallest time-frequency unit to which a modulation symbol of a data channel or a modulation symbol of a control channel is mapped. A resource block (RB) is a resource allocation unit and includes time-frequency resources corresponding to 180 kHz on the frequency axis and 1 slot on the time axis. On the other hand, a resource block pair (PBR) means a resource unit including two consecutive slots on the time axis.

Several physical channels can be used in the physical layer, and the physical channels can be mapped to the radio frame and transmitted. As a downlink physical channel, a physical downlink control channel (PDCCH) / enhanced physical downlink control channel (EPDCCH) includes a resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) Request information. The PDCCH / EPDCCH may carry an uplink grant informing the UE of the resource allocation of the uplink transmission. PDCCH and EPDCCH are different in the resource area to be mapped. A DL-SCH is mapped to a PDSCH (Physical Downlink Shared Channel). The Physical Control Format Indicator Channel (PCFICH) informs the UE of the number of OFDM symbols used in the PDCCH and is transmitted every subframe. The Physical Hybrid ARQ Indicator Channel (PHICH) is a downlink channel that carries an HARQ (Hybrid Automatic Repeat reQuest) ACK (Acknowledgment) / NACK (Non-acknowledgment) signal, which is a response of an uplink transmission. The HARQ ACK / NACK signal may be referred to as an HARQ-ACK signal.

As an uplink physical channel, Physical Random Access Channel (PRACH) carries a random access preamble. The Physical Uplink Control Channel (PUCCH) includes HARQ-ACK, which is a response of downlink transmission, channel status information (CSI) indicating a downlink channel status, for example, a channel quality indicator (CQI) Uplink control information such as a precoding type indicator (PTI), a rank indicator (RI), and the like. The Physical Uplink Shared Channel (PUSCH) carries an Uplink Shared Channel (UL-SCH).

PUSCH, and the uplink data may be a transport block (TB), which is a data block for a UL-SCH transmitted during a TTI (Transmission Time Interval). The transport block may include user data. Alternatively, the uplink data may be multiplexed data. The multiplexed data may be a multiplexed transport block for UL-SCH and UL control information. That is, if there is user data to be transmitted in the uplink, the uplink control information may be multiplexed together with the user data and transmitted through the PUSCH.

Meanwhile, in recent years, in the frequency band of the wireless communication system or in other bands, D2D communication using direct transmission / reception technology of the wireless communication system but directly exchanging user data between terminals without going through an infrastructure (for example, a base station) A plan is being considered. D2D communication enables wireless communication in an area other than a limited wireless communication infrastructure and reduces the network load of the wireless communication system. In addition, D2D communication provides advantages such as disaster information and the like can be transmitted to terminals even when the base stations do not operate smoothly in a situation of war, disaster or the like.

A terminal transmitting a signal based on D2D communication is referred to as a transmission terminal (Tx UE), and a terminal receiving a signal based on communication between terminals is defined as a reception terminal (Rx UE). The transmitting terminal transmits a discovery signal, and the receiving terminal can receive the discovery signal. The roles of the transmitting terminal and the receiving terminal may be changed. On the other hand, the signal transmitted by the transmitting terminal may be received by two or more receiving terminals. Also, in the D2D communication according to the present invention, the first terminal transmits data and control signals in the uplink, and the second terminal receives the uplink data and the control signal transmitted from the first terminal. Thus, an SC-FDMA symbol may be used to construct a physical channel carrying data and control signals.

4 is a diagram for explaining the concept of a cellular network-based D2D communication applied to the present invention.

Referring to FIG. 4, a cellular communication network including a first base station 410, a second base station 420, and a first cluster 430 is configured. The first terminal 411 and the second terminal 412 belonging to the cell provided by the first base station 410 perform communication through a normal access link (cellular link) through the first base station 410. [ This is an In-coverage-single-cell inter-terminal communication scenario. Meanwhile, the first terminal 411 belonging to the first base station 410 can perform terminal-to-terminal communication with the fourth terminal 421 belonging to the second base station 420. This is an In-coverage-multi-cell inter-terminal communication scenario. The fifth terminal 431 other than the network coverage may create one cluster 430 together with the sixth terminal 432 and the seventh terminal 433 to perform communication with the terminals. This is an out-of-coverage inter-terminal communication scenario. Also, the third terminal 413 can perform terminal-to-terminal communication with the sixth terminal 432, which is a partial-coverage terminal-to-terminal communication scenario. In this way, the inter-terminal communication link can be performed between devices having the same cell as a serving cell, between devices having different cells as a serving cell, and can be performed between a device connected to a serving cell and a serving cell ), Or between devices not connected to a serving cell. In particular, D2D communication may be required between devices outside of network coverage for the purpose of public safety and the like.

In order to perform D2D data transmission / reception through D2D communication, relevant control information must be transmitted / received between the terminals. The relevant control information may be referred to as a Scheduling Assignment (SA). The Rx terminal may perform a configuration for receiving D2D data based on the SA. The SA includes, for example, a New Data indicator (NDI), a Transmit UE Identification (Tx) ID, a Redundancy Version indicator, an MCS indication, a Resource Allocation , And a power control indication.

Here, NDI indicates whether the current transmission is a repetition of data, i.e., retransmission or new. The receiver can combine the same data based on NDI. The Tx terminal ID indicates the ID of the transmitting terminal. The RV indicator indicates the redundancy version by specifying the different starting points in the circular buffer for the encoded buffer reading. Based on the RV indicator, the transmitting terminal may choose various redundancy versions for the repetition of the same packet. The MCS indication indicates the MCS level for D2D communication. The resource allocation instruction indicates to which time / frequency physical resource the corresponding D2D data is allocated to be transmitted. The power control instruction will be a command for the terminal that has received the information to control the size of power appropriate for the D2D transmission.

For a terminal supporting D2D communication, a radio resource for D2D communication may be an uplink channel of the (cellular) radio communication system. In this case, the SA and data for the D2D communication may be transmitted based on the structure of the PUSCH among the uplink physical channels of the wireless communication system. That is, the PUSCH structure can be reused for the physical channel for D2D communication. For example, a 24-bit CRC (Cyclic Redundancy Check) can be inserted in the physical channel for D2D communication, and turbo coding can be used. Rate matching may also be used for bit size matching and generating multiple transmissions. Scrambling can be used for interference randomization. PUSCH Demodulation Reference Signal (DMRS) can be used.

At the perspective of the Tx terminal, the Tx terminal may operate in two modes for resource allocation.

Mode 1 is the case where a base station or relay node (hereinafter referred to as a base station, which may include a relay node) schedules certain resource (s) for D2D communication. That is, in mode 1, the specific resource (s) used for transmitting the D2D data and the D2D control information (SA) of the Tx terminal is designated by the base station or the relay node. Mode 2 is a case where the UE directly selects a specific resource (s) in the resource pool. That is, in mode 2, the Tx terminal directly designates specific resource (s) for transmission of D2D data and D2D control information.

A D2D capable terminal supports at least mode 1 for in-coverage D2D communication. A D2D communicatable terminal supports mode 2 for at least out-of-coverage or edge-of-coverage D2D communication.

D2D communications may include unicast communications, groupcast communications, and broadcast communications. In this case, the Tx terminal performing the D2D broadcast communication may be called a broadcasting terminal. For D2D broadcast communication, an SA indicating the location of the resource (s) for reception of an associated physical channel carrying D2D data must be transmitted by the broadcasting terminal. The resource (s) may be implicitly and / or explicitly indicated based on the content of the SA resource or SA.

In Mode 1, the location of the resource (s) for transmission of the (by) SA by the broadcasting terminal and the location of the resource (s) for transmission of the D2D data is given by the base station. That is, the D2D SA grant and the D2D data grant are given from the base station to the terminal. Here, the D2D SA grant instructs the Tx terminal to transmit the D2D SA, and the D2D data grant instructs the Tx terminal to transmit the D2D data. The D2D data grant may be transmitted concurrently with or at the same time as the SA grant. The D2D SA grant and the D2D data grant may be transmitted via the PDCCH / EPDCCH.

In Mode 2, the resource pool for the SA may be pre-configured and / or semi-statically allocated. In this case, the Tx UE can select a resource for the SA in the resource pool for transmission of the SA.

If the Tx terminal is located outside of coverage, the resources for D2D broadcast data are selected in the resource pool. In this case, the resource pool may be pre-configured or semi-statically allocated.

The Tx terminal must instruct the at least one D2D Rx terminal with the control information SA associated with the D2D data before transmitting the D2D data to at least one Rx terminal (broadcast / group cast / unicast). Due to the nature of the D2D communication link, it does not currently support HARQ-ACK feedback for at least D2D broadcast communication. Also, the D2D communication link is in a half-duplex constraint state. That is, it does not support simultaneous transmission and reception on the same time or subframe. Multiple transmission opportunities may be defined for reliable and flexible D2D communication in such an environment. One or more SAs and / or data transmissions may be performed within one multiplex transmission opportunity. That is, the same SA and / or data may be transmitted in duplicate within one multiplex transmission opportunity, and other (or multiple) SAs and / or data may be transmitted. Herein, another (or multiple) SA (and / or data) is transmitted includes not only cases where all of the SAs (and / or data) transmitted in the multiple transmission opportunity are different, but only some others. The multiple transmit opportunity may be referred to as a multiple SA transmit opportunity for SA transmissions and multiple data transmit opportunities for data transmissions.

In addition, Resource Pattern for Transmission (RPT), which is a pattern for time and / or frequency resources for multiple transmission opportunities, may be used.

For example, for control information for D2D communication, an SA corresponding to the control information may be transmitted from a resource corresponding to the RPT. At this time, for an RPT which is a pattern of time and / or frequency resources for multiple transmission opportunities, one SA may be transmitted in one RPT, and a plurality of SAs may be transmitted.

Also, for data for D2D communication, a data transmission block (TB), which is a unit of transmission of the data, can be transmitted from a resource corresponding to the RPT. At this time, for RPT, which is a pattern of time and / or frequency resources for multiple transmission opportunities, one data TB may be transmitted in one RPT, and a plurality of data TBs may be transmitted.

The RPT can be implicitly or explicitly signaled by the base station (or relay node) in the mode 1 resource allocation of D2D. And may be signaled via SA in case of RPT for the data TB for Mode 1 and Mode 2 resource allocation.

In order to support the D2D communication according to the present invention as described above, it is necessary to allocate resources for D2D SA and D2D data and to instruct resource allocation information accordingly.

In particular, in mode 1, a D2D SA grant and a D2D data grant must be transmitted from a base station to a Tx terminal for D2D communication, and a method of indicating related resource allocation information carried by the D2D SA grant and the D2D data grant should be defined .

1. Control information and signaling method for the D2D SA grant (how to indicate whether it is the same SA transmission or multiple SA transmissions in multiple transmission opportunities)

1st Example : Semi-static signaling ( Semi - static signaling )

Information on whether to perform the same SA transmission or other SA transmission within the multiple SA transmission opportunity can be indicated to the Tx terminal through higher layer signaling by the base station (or relay node).

For example, the base station may receive a D2D start indication or an enabling request message from the Tx terminal and may set related parameters for D2D communication in response to the D2D start indication. In this case, information on whether to perform a single TB transmission or multiple TB transmission within the multiple data transmission opportunity can be transmitted to the Tx terminal in addition to the RRC signaling in the form of semi-static signaling. In this case, the RRC signaling may include at least one of the following parameters.

● Multiple SA transmission enabling parameter
Number of RPTs for multiple transmission opportunity
If multiple SA transmissions are enabled as indicated above
- Number of Retransmission for a SA transmission
- Which SA transmission opportunity (s) are associated to each SA
● Otherwise, (Same SA transmission within MTO)
- Number of Retransmission for a SA transmission
- D2D-SA grant indicates Resource location (or RPT index) for a SA transmission

Referring to Table 1, a multiple SA transmission enabling parameter is a parameter indicating whether transmission of multiple (or other) SAs within the multiple (SA) transmission opportunity is possible.

The number of RPTs for multiple transmission opportunities represents the number of RPTs applicable to the multiple transmission opportunity.

If multiple SA transmissions are enabled, the number of retransmissions for a SA transmission, and which SA transmission opportunity is associated with each SA, are associated to each SA). That is, it includes information on the association between each transmission opportunity and multiple SAs according to the RPT of the multiplex transmission opportunity. The information on the association can indicate how many transmission opportunities are used for each SA in the multiple SAs. The information on the association relationship may further include an association between the multiple SAs and the RPTs. For example, the multiple transmission opportunity includes four SA transmission opportunities (one RPT assumption with four transmission opportunities), the first, second, and third transmission opportunities correspond to SA # 0, the fourth transmission opportunity May correspond to SA # 1. In this case, the information on the association relation may include the following bitmap. SA # 0: {1,1,1,0}, SA # 1: {0,0,0,1}. In another example, the multiple transmission opportunity includes 8 SA transmission opportunities and 2 RPTs (assuming each RPT has 4 transmission opportunities), RPT # 0 corresponds to SA # 0, RPT # 1 corresponds to SA # 1 < / RTI > That is, in this case, only the same SA transmission is allowed in one RPT. As another example, the multiple transmission opportunity includes 8 SA transmission opportunities and 2 RPTs (assuming each RPT has 4 transmission opportunities), and RPT # 0 and RPT # 1 indicate that they correspond to SA # 0 . That is, in this case, only one SA is transmitted within the multiplex transmission opportunity.

If it is not multi-SA capable, it indicates that it is the same (or single) SA transmission in multiple transmission opportunities. In this case, the number of retransmissions for a SA transmission (Number of retransmission for a SA transmission) may be included in the signaling. The resource location or RPT index for the SA may be indicated only by the D2D SA grant. For example, an index of RPTs used for the SA transmission among a plurality of RPTs may be indicated.

Hereinafter, a method for instructing the same SA transmission or another SA transmission in a multiple transmission opportunity will be described in detail with reference to the drawings.

5 to 8 show examples of D2D communication performed in the Tx terminal. 5 to 8, a Tx terminal receives a D2D SA grant and a D2D data grant on a downlink (DL) from a base station, and the Tx terminal transmits at least one D2D SA and at least one D2D Examples of transferring data are shown.

FIG. 5 shows a case where one SA PRT is configured in a multiple transmission opportunity and the same SA is (re) transmitted (Case 1). Referring to FIG. 5, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 within the SA transmission opportunity of 4 times and transmits it to the Rx terminal on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

Also, the Tx terminal repeatedly transmits data # 0 (D2D) on the RPT for the D2D data of the data resource pool on the UL based on the D2D data grant received on the DL from the base station. In this case, RPT for D2D data can be indicated by SA # 0.

On the other hand, FIG. 6 shows a case where one SA PRT is configured in a multiplex transmission opportunity and another SA is (re) transmitted (Case 2). Referring to FIG. 6, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 to the SA transmission opportunity of 3 times and transmits it to the Rx terminal on the UL. Also, the Tx terminal maps SA # 1 to the remaining one SA transmission opportunity and transmits it to the Rx terminal on the UL. The Rx terminal (s) may perform configuration for receiving D2D data based on SA # 0 and SA # 1.

Based on the D2D data grant # 0 received on the DL from the base station, the Tx terminal repeatedly transmits the data # 0 on the first RPT for the D2D data of the data resource pool on the UL. In this case, the first RPT for data # 0 may be indicated by SA # 0. Also, the Tx terminal repeatedly transmits data # 1 on the second RPT for the D2D data of the data resource pool on the UL based on the D2D data grant # 1 received on the DL from the base station. In this case, the second RPT for data # 1 may be indicated by SA # 1.

FIG. 7 shows a case where a plurality of SA PRTs are configured in a multiplex transmission opportunity and the same SA is (re) transmitted (Case 3). Referring to FIG. 7, in a multiple transmission opportunity in an SA resource pool, two SA RPTs each include two SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received from the base station from the base station, the Tx terminal maps SA # 0 to the second SA transmission opportunity according to the first SA RPT and transmits the SA # 0 to the Rx terminal on the UL. Also, the Tx terminal maps SA # 0 to the second SA transmission opportunity according to the second SA RPT, and transmits it to the Rx terminal on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

Based on the D2D data grant received on the DL from the base station, the Tx terminal repeatedly transmits the data # 0 on the first RPT for the D2D data of the data resource pool on the UL. In this case, the first RPT for data # 0 may be indicated by SA # 0.

FIG. 8 shows a case where a plurality of SA PRTs are configured in a multiplex transmission opportunity, and multiple SAs are (re) transmitted (Case 4). Referring to FIG. 8, in a multiple transmission opportunity in an SA resource pool, two SA RPTs each include two SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received from the base station from the base station, the Tx terminal maps SA # 0 to the second SA transmission opportunity according to the first SA RPT and transmits the SA # 0 to the Rx terminal on the UL. Also, the Tx terminal maps SA # 1 to the second SA transmission opportunity according to the second SA RPT, and transmits it to the Rx terminal on the UL. The Rx terminal (s) may perform configuration for receiving D2D data based on SA # 0 and SA # 1.

Through the signaling according to the present invention as described above, it is possible to instruct the same SA transmission or another SA transmission in the multiple transmission opportunity. In the above, the RPT for SA / data transmission represents a pattern of time and / or frequency resources, and thus may be predetermined as a standard, or may be indicated in any other way. For example, the hopping method may be applied with multiple time and / or frequency resources (e.g., subframe and / or PRB) resources in multiple transmission opportunities within an RPT. Further, the RPT information may be indicated through the D2D SA / data grant.

On the other hand, as in Case 2, D2D communication can be supported by only one additional SA transmission within a multiplex transmission opportunity. In this case, the advantage of the one-time SA transmission can increase the efficiency of resource utilization by limiting the number of SA retransmissions that may be unnecessary in the limited SA resource pool according to the base station configuration. On the other hand, the disadvantage is that scheduling for WAN (ie PUSCH) transmissions in the case of robust transmissions (eg low MCS, high power spectral density (PSD) in the resource) Constraints are required.

Second Example : dynamic Signaling Dynamic signaling )

Information about whether to perform the same SA transmission or other SA transmissions within the multiple SA transmission opportunity can be indicated through dynamic signaling. In this case, dynamic signaling enables more adaptive resource utilization and scheduling for D2D communication. For dynamic signaling, parameter sets relating to parameters as described above in Table 1 are set in advance via RRC signaling, and one set of parameters from each parameter set can be indicated via dynamic signaling.

A specific set of the parameter sets may be indicated, for example, by the following methods.

(1) Alt 1. How to direct through the DCI field

A particular set of the parameter sets may be indicated via a DCI field. The Downlink Control Information (DCI) indicating the D2D SA grant may include the following fields.

SA transmission selection field in D2D-SA grant SA transmission selection 0 Configuring Parameter set for Case 1 (default) One Configuring Parameter set for Case 2

SA transmission selection field in D2D-SA grant SA transmission selection 00 Configuring Parameter set for Case 1 (default) 01 Configuring Parameter set for Case 2 10 Configuring Parameter set for Case 3 11 Configuring Parameter set for Case 4

Referring to Tables 2 and 3 above, the DCI indicating the D2D SA grant may include an SA trnasmission selection field. In this case, it is possible to indicate a specific parameter set according to the value of the SA transmission selection field. For example, when the value of the SA transmission selection field indicates 0, a parameter set # 0 (for example, a parameter set for Case 1) can be selected, and when the value of the SA transmission selection field indicates 1 , A parameter set # 1 (for example, a parameter set for Case 2) may be selected. Table 2 shows a case where the SA trnasmission selection field has a size of 1 bit, and Table 3 shows a case where the SA transmission selection field has a size of 2 bits.

(2) Alt 2. (E) PDCCH CRC (Cyclic Redundancy Check) Method of instructing through masking

A specific set of the parameter sets may be indicated via (E) PDCCH CRC masking.

The base station determines the (E) PDCCH format according to the DCI to be sent to the terminal, and appends CRC to the control information. The CRC is masked with a unique identifier (RNTI) according to the (E) PDCCH's owner or usage. Specifically, the payload bits of the DCI are a ₀ , a ₁ , ..., a _A _-1 and the parity bits of the CRC are p ₀ , p ₁ , ..., p _L _- ₁ . Where A is the payload size and L is the number of parity bits. The payload bits are the CRC parity bits are added, the added CRC bits _{b 0, b 1, ...,} b B -1 is generated. Here, B = A + L. Since CRC parity bits (at least (at least)) corresponding to the scrambling and _{RNTI (x rnti, 0, x} rnti, 1, ..., x rnti, 15) Finally, the bit sequence c _0, c _1, ... that ., c _B _-1 are generated. In this case, the CRC may indicate that the RNTI is masked. In this case, the relationship between c _k and b _k can be expressed as follows depending on whether the terminal transmission antenna selection (or switching) is applicable or not.

First, when the UE transmission antenna selection is not applicable, the relationship between c _k and b _k can be expressed by Equation (1).

In Equation (1), x _D2D _{, 0 to 15} may be referred to as SA transmission selection masks and may be as shown in Table 4 below.

SA transmission selection SA transmission selection mask (x _D2D _{, 0-15} ) Using Parameter set for Case 1 (default) <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0> Using Parameter set for Case 2 <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1>

On the other hand, when the terminal transmission antenna selection is applicable, the relationship between c _k and b _k can be expressed by the following equation (2).

The SA transmission selection mask according to Equation (2) may be as shown in Table 5 below.

SA transmission selection SA transmission selection mask (x _D2D _{, 0-15} ) Using Parameter set for Case 1 (default) <1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0> Using Parameter set for Case 2 <0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0>

The terminal uses blind decoding to detect (E) the PDCCH. The blind decoding demask a desired identifier in the CRC of the received (E) PDCCH (referred to as a candidate (E) PDCCH), checks the CRC error and checks whether the corresponding PDCCH / EPDCCH is its own control channel .

According to the present invention, the Tx terminal can detect a specific set of parameters based on the detected SA transmission selection mask value as a result of blind decoding. For example, in the Tx terminal, as shown in Table 4, if the detected SA transmission selection mask is < 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 , 0>, it can be determined that the parameter set for Case 1 is used.

On the other hand, the following method can also be considered to indicate SA MTO in a manner different from the above. Some of the parameters presented in Table 1 above may be transmitted via the D2D SA grant. In this case, among the parameters shown in Table 1, parameters transmitted through the D2D SA grant may not be transmitted in upper layer signaling. For example, at least one of the parameters shown in Table 6 below may be transmitted via the D2D SA grant.

● Multiple SA transmission flag bit (same or differnt SA transmission)
If multiple SA transmissions blag bits are enabled
- Which SA transmission opportunity (s) are associated to each SA
● Otherwise, (Same SA transmission within MTO)
- D2D-SA grant indicates Resource location (or RPT index) for a SA transmission

2. Control information and signaling methods for the D2D Data Grant (how to indicate the same TB transmission in multiple transmission opportunities or another TB transmission)

The biggest design issue for the D2D Data Grant is whether a single TB is re-transmitted or multiple TBs are re-transmitted over multiple transmission opportunities. This can reuse the proposed signaling method for SA transmission described above in the present invention.

In particular, a supporting signaling method may be applied for Case 1/2/3/4 described in connection with the same / different SA transmission. In this case, the parameters for the SA need to be changed to the parameters for the TB (or data). This can support signaling for either a single TB transmission over a D2D data grant or multiple TB transmissions. (Or interpretation) of the parameter can be summarized as follows.

D2D SA Grant D2D Data Grant Issue: Same / different SA within multiple SA transmission opportunity Issue: Same / different data (TB) within multiple data transmission opportunity The same SA (re) transmission (Case 1) on multiple SA transmission opportunities in one SA RPT A single TB (re) transmission on multiple data transmission opportunities within one data RPT (Case 5) Another SA (re) transmission on multiple SA transmission opportunities in one SA RPT (Case 2) Multiple TB (re) transmissions on multiple data transmission opportunities in one data RPT (Case 6) The same SA (re) transmission on multiple SA transmission opportunities in multiple SA RPTs (Case 3) A single TB (re) transmission on multiple data transmission opportunities in multiple data RPTs (Case 7) Other SA (re) transmissions on multiple SA transmission opportunities in multiple SA RPTs (Case 4) Multiple (re) transmission on multiple data transmission opportunities in multiple data RPTs (Case 8)

The signaling method for D2D SA transmission proposed above can be utilized for signaling for D2D data transmission based on the correlation between them as shown in Table 7 above.

A method for the same / different SA transmission within a multiple SA transmission opportunity may be utilized for each transmission method of a single / multiple TB within multiple data transmission opportunities. When a single TB is transmitted within a multiple data transmission opportunity, since only the same data MAC PDU (re) transmission is indicated within multiple data transmission opportunities, the reliability of data packet reception for the Rx terminal can be improved. In addition, in the half-duplex limit situation, it is possible to reduce the probability of data packet loss by providing additional reception opportunities for the Rx terminal. On the other hand, when multiple TBs are transmitted within multiple data transmission opportunities, different data MAC PDUs (re-) can be transmitted within multiple data transmission opportunities, so multiple D2D sessions for Tx terminals can be configured within one data cycle And can support multiple D2D data communications for synchronization.

As described above, reliable and flexible D2D data communication can be performed through single or multiple TB transmissions within multiple data transmission opportunities. In order to perform the flexible D2D communication as described above, the base station must be able to instruct not only a single TB but also multiple TB transmission through one D2D grant.

1st Example : Semi-static signaling ( Semi - static signaling )

Information on whether to perform a single TB transmission or multiple TB transmission within a multiple data transmission opportunity can be indicated to the Tx terminal through higher layer signaling by the base station (or relay node).

For example, the base station may receive a D2D start indication or an enabling request message from the Tx terminal and may set related parameters for D2D communication in response to the D2D start indication. In this case, information on whether to perform the same SA transmission or the other SA transmission in the multi-SA transmission opportunity may be added to the RRC signaling in the form of semi-static signaling and transmitted to the Tx terminal. In this case, the RRC signaling may include at least one of the following parameters.

Multiple TB transmission enabling parameter
Number of RPTs for multiple transmission opportunity
● If multiple TB transmissions are enabled as indicated above
- Number of Retransmission for a TB transmission
- Which TB transmission opportunity (s) are associated to each TB
● Otherwise, (Single TB transmission within MTO)
- Number of Retransmission for a TB transmission
- D2D data grant indication Resource location (or RPT index) for a TB transmission

Referring to Table 8, the multiple TB transmission enabling parameter is a parameter indicating whether transmission of multiple TBs is possible within the multiple (TB) transmission opportunity.

If multiple TB transmissions are enabled, the number of retransmissions for a TB transmission, and which TB transmission opportunity is associated with each TB, are associated to each TB. That is, the RPT of the multiplex transmission opportunity includes information on the relationship between each transmission opportunity and the multiple TBs. The information on the (TB) association may indicate how many transmission opportunities are used for each TB of the multiple TBs. The information on the association relationship may further include an association relationship between the multiple TBs and the RPTs. For example, the multiple transmission opportunity includes four TB transmission opportunities (one RPT assumption with four transmission opportunities), the first, second, and third transmission opportunities correspond to TB # 0, the fourth transmission opportunity May correspond to TB # 1. In this case, the information on the association relation may include the following bitmap. TB # 0: {1,1,1,0}, TB # 1: {0,0,0,1}. RPT # 0 corresponds to TB # 0, RPT # 1 corresponds to TB # 0, and RPT # 1 corresponds to TB # 1 < / RTI > That is, in this case, only the same TB transmission is allowed in one RPT. As another example, the multiplex transmission opportunity includes 8 TB transmission opportunities and 2 RPTs (assuming each RPT has 4 transmission opportunities), and RPT # 0 and RPT # 1 indicate that they correspond to TB # 0 . That is, in this case, only one SA is transmitted within the multiplex transmission opportunity.

If it is not multi-TB capable, it indicates the same (or single) TB transmission within multiple transmission opportunities. In this case, the number of retransmissions for a TB transmission (Number of retransmission for a SA transmission) may be included in the signaling. The resource location or RPT index for the TB may be indicated only by the D2D data grant. For example, an index of RPTs used for the TB transmission among a plurality of RPTs may be indicated.

Hereinafter, a method of instructing a single TB transmission or multiple TB transmission in a multiple transmission opportunity will be described in detail with reference to the drawings.

9 to 12 show other examples of D2D communication performed in the Tx terminal. 9 to 12, the Tx terminal receives the D2D SA grant and the D2D data grant on the downlink (DL) from the base station, and the Tx terminal transmits at least one D2D SA and at least one D2D Examples of transferring data are shown.

FIG. 9 shows a case where one data PRT is configured in a multiplex transmission opportunity, and a single TB is (re) transmitted (Case 5). Referring to FIG. 9, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 within the SA transmission opportunity of 4 times and transmits it to the Rx UE (s) on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

FIG. 10 shows a case where one data PRT is configured in a multiplex transmission opportunity and multiple TBs are (re) transmitted (Case 6). Referring to FIG. 10, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 within four data transmission opportunities and transmits it to the Rx UE (s) on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

Based on the proposed D2D data grant and upper layer signaling received on the DL from the base station, the Tx UE transmits multiple TBs (data # 0 and data # 1) on one first RPT for D2D data of the D2D resource pool on the UL send. In this case, the first RPT for data # 0/1 can be indicated to the Rx terminal by the SA # 0.

FIG. 11 shows a case where a plurality of data PRTs are configured in a multiplex transmission opportunity, and a single TB is (re) transmitted (Case 7). Referring to FIG. 11, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 within four data transmission opportunities and transmits it to the Rx UE (s) on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

The Tx UE repeatedly transmits data # 0 on the first RPT and the second RPT for the D2D data of the data resource pool on the UL based on the proposed D2D data grant and higher layer signaling received on the DL from the base station. In this case, the first RPT and the second RPT for the data # 0 may be indicated by the SA # 0.

12 shows a case where a plurality of data PRTs are configured in a multiplex transmission opportunity and multiple TBs are (re) transmitted (Case 8). Referring to FIG. 12, in a multiple transmission opportunity in an SA resource pool, one SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. Based on the D2D SA grant received on the DL from the base station, the Tx UE maps SA # 0 within four data transmission opportunities and transmits it to the Rx UE (s) on the UL. The Rx terminal (s) may perform a configuration for receiving D2D data based on SA # 0.

The Tx terminal transmits data # 0 on the first RPT for the D2D data of the D2D resource pool on the UL based on the proposed D2D data grant and upper layer signaling received on the DL from the base station and transmits data # Lt; / RTI > In this case, the first RPT for data # 0 and the second RPT for data # 1 may be indicated by SA # 0.

Through the signaling according to the present invention as described above, it is possible to instruct a single TB transmission or multiple TB transmission in a multiplex transmission opportunity. As described above, the RPT for data transmission represents a pattern of time and / or frequency resources, and thus can be predetermined as a standard, or can be indicated by any other method as described above.

In addition, the embodiments described in Figures 9-12 have been described on the basis of the signaling method associated with the D2D data grant, and it is assumed that the same SA (SA # 0) is repeatedly transmitted on the SA resource pool. However, as an example, another (or multiple) SA (SA # 0 / SA # 1) is repeatedly transmitted according to a certain criterion, as illustrated in Figures 5-8, based on the signaling method associated with the D2D SA grant It is of course also possible that a signaling method associated with the D2D SA grant according to the invention and a signaling method associated with the D2D data grant may be implemented in combination.

Second Example : dynamic Signaling Dynamic signaling )

Information about whether to perform a single TB transmission or a multiple TB transmission within a multiple (data) transmission opportunity can be indicated through dynamic signaling. In this case, dynamic signaling enables more adaptive resource utilization and scheduling for D2D communication. Parameter sets for the parameters as described above in Table 8 for dynamic signaling are set in advance through RRC signaling and one set of parameters from each parameter set can be indicated via dynamic signaling. In this case, the above-described method for signaling for the D2D SA grant can be reused. In this case, the SA transfer selection field in the D2D SA grant is the TB transfer selection field in the D2D data grant, the SA transfer selection is TB transmission selection, and the SA transmission selection mask is TB transmission selection mask.

In the present invention, basically, all of the above-mentioned data scheduling decisions are based on what the base station does. However, certain control information, e.g., a new SA transmission opportunity (e.g., using a fixed transmission opportunity in one SA RPT or a new SA RPT), may be possible to be scheduled by the Tx terminal. In this case, information on how many of the data MTO previously indicated through the D2D data grant are instructed to transfer the new data TB can be transmitted to the Rx terminal through the new SA.

The Rx UE can know whether a new SA transmission is received (NDI) in advance by means of upper layer signaling or another signaling method (for example, DMRS).

13 shows another example of D2D communication performed in the Tx terminal. 13, a Tx terminal receives a D2D SA grant and a D2D data grant on a downlink (DL) from a base station, and the Tx terminal transmits at least a plurality of D2D SAs and a plurality of D2D data on an uplink (UL) An example is shown.

Referring to FIG. 13, one SA RPT is configured in the multiple (SA) transmission opportunity in the SA resource pool, and one data RPT is configured in the multiple (data) transmission opportunity in the data resource pool. SA RPT includes four SA transmission opportunities in a pattern of time and / or frequency resources. The data RPT includes four data transmission opportunities in a pattern of time and / or frequency resources.

The Tx UE maps the single (same) SA # 0 to the SA transmission opportunity of 3 times based on the D2D SA grant received on the DL from the base station, and transmits the SA # 1 to the remaining one SA You can map to transmission opportunities.

Also, the Tx terminal maps the single (identical) data # 0 to the data transmission opportunity of two times based on the D2D data grant received on the DL from the base station, and transmits the data # 1 to the remaining two You can map to data transfer opportunities. In this case, the associated control information for data # 0 may be indicated by SA # 0, and the associated control information for data # 1 may be indicated by SA # 1.

The D2D data transmission efficiency can be improved through the above-described method, and flexible D2D communication can be supported by supporting the scheduling of the terminal itself if necessary.

FIG. 14 is an example of a flowchart illustrating a signaling method for D2D communication according to the present invention.

Referring to FIG. 14, the base station transmits D2D communication configuration information to the Tx terminal (S1400). The D2D communication configuration information may be transmitted via RRC signaling. The base station generates the D2D communication configuration information according to its own scheduling decision and transmits the D2D communication configuration information to the Tx terminal or receives (not shown) a D2D enalbing request message from the Tx terminal, And transmit the D2D communication configuration information to the Tx terminal.

For example, the D2D communication configuration information included in the RRC signaling may include information indicating whether the same SA is transmitted or a different SA is transmitted in a first multiplex transmission opportunity (multiple SA transmission opportunity) and / or information indicating a second multiplex transmission opportunity Multiple data transmission opportunities), or information indicating whether multiple TBs are to be transmitted. The D2D communication configuration information included in the RRC signaling may include, for example, at least one of the parameters included in Table 1 and / or Table 8 described above.

As another example, the D2D communication configuration information included in the RRC signaling may include parameter sets for D2D communication. A particular set of the parameter sets may be indicated via a PDCCH carrying a grant for D2D communication or a grant for the D2D communication. The parameters included in the parameter set for the D2D communication may include at least one of the parameters included in Table 1 and / or Table 8 described above.

The RRC signaling may be included in an RRC connection reconfiguration message. The Tx terminal may perform a configuration for D2D communication based on the D2D communication configuration information.

The base station transmits the D2D SA grant and the D2D data grant to the Tx terminal (S1410). The D2D SA grant and the D2D data grant may be transmitted simultaneously or at the same time. The D2D SA grant is information for instructing the Tx terminal to transmit SA (D2D SA) as control information for D2D communication to the Rx terminal, and the D2D data grant instructs the Tx terminal to transmit D2D data to the Rx terminal Information. The D2D SA grant and the D2D data grant may be transmitted via at least one (E) PDCCH.

The Tx UE determines whether the multi-SA and / or multi-TB transmission is performed based on at least one of the D2D communication configuration information, the D2D SA grant and the D2D data grant (S1420).

If the D2D communication configuration information includes parameter sets for the D2D communication, a particular parameter set of the parameter sets is indicated based on the DCI indicating the D2D SA grant and / or the DCI indicating the D2D data grant . For example, the DCI indicating the D2D SA grant may include an SA transmission selection field and may indicate the particular parameter set according to the value of the SA transmission selection field. In another example, the DCI indicating the D2D data grant may include a TB transmission selection field and may indicate the particular parameter set according to the value of the TB transmission selection field.

Or if the D2D communication configuration information includes parameter sets for the D2D communication, then a particular parameter set of the parameter sets may be transmitted to the PDCCH carrying the D2D SA grant and / or the PDCCH carrying the D2D data grant Lt; / RTI > The Tx terminal uses blind decoding for (E) detection of the PDCCH. The blind decoding is a method of checking whether a corresponding PDCCH / EPDCCH is a control channel by checking a CRC error in the CRC of a received candidate (E) PDCCH. The Tx terminal can detect a specific set of parameters based on the blind decoding result, the detected SA transmission selection mask or the data transmission selection mask value. Examples of the correspondence relationship of the SA transfer selection mask value and the specific parameter set are described in Table 4 and Table 5. [

The Tx terminal may perform an associated configuration for D2D communication based on the detected specific parameter set. The Tx UE can determine whether the same SA or another SA is transmitted in the first multiplex transmission opportunity based on the detected specific parameter set or whether a single TB is transmitted within the second multiplex transmission opportunity It is possible to determine whether multiple TBs are transmitted.

The Tx terminal transmits at least one SA on the first multiplex transmission opportunity to the Rx terminal based on the D2D SA grant (S1430). In this case, the Tx UE may transmit the same or different SA on the first RPT, which is a pattern of time and / or frequency resources in the first multiplex transmission opportunity, based on at least one of the D2D communication configuration information and the D2D SA grant.

The Tx terminal transmits at least one data TB to the Rx terminal on the data RPT in the second multiplex transmission opportunity based on the D2D data grant (S1440). In this case, the Tx terminal may transmit a single or multiple TBs on the second RPT, which is a pattern of time and / or frequency resources in the second multiplex transmission opportunity, based on at least one of the D2D communication configuration information and the D2D SA grant.

According to the above-described method, since the same SA or other SAs can be transmitted and instructed in the multiple SA transmission opportunity, the reliability or transmission efficiency of the corresponding control information can be increased. In addition, according to the present invention, since a single TB or multiple TBs can be transmitted and instructed in multiple data transmission opportunities, the reliability or transmission efficiency of the data can be increased.

15 is an example of a block diagram illustrating a wireless communication system supporting D2D communication according to the present invention.

Referring to FIG. 15, a base station 1500 includes a processor 1505, a memory 1510, and an RF unit (radio frequency) unit 1515. The memory 1510 is coupled to the processor 1505 and stores various information for driving the processor 1505. [ The RF unit 1515 is connected to the processor 1505 to transmit and / or receive wireless signals. The processor 1505 implements the proposed functions, procedures and / or methods for performing the operations according to the present invention. In the above-described embodiments, the operation of the base station can be implemented by the processor 1505. [

Specifically, the processor 1505 can generate the D2D communication configuration information published in this specification and transmit it to the Tx terminal 1530 through the RF unit 1515. In addition, the processor 1505 may generate the D2D SA grant and the D2D data grant, and may transmit the D2D SA grant and the D2D data grant to the Tx terminal 1530 through the RF unit 1515. [ The D2D SA grant and the D2D data grant may be included in the same or different (E) PDCCH and transmitted to the Tx terminal 1530.

The Tx terminal 1530 includes a processor 1535, a memory 1540, and an RF unit 1545. The memory 1540 is coupled to the processor 1535 to store various information for driving the processor 1535. The RF unit 1545 is coupled to the processor 1535 to transmit and / or receive wireless signals. Processor 1545 implements the proposed functions, procedures and / or methods for performing the operations according to the present invention. The operation of the Tx terminal 1530 in the above described embodiments may be implemented by the processor 1535. [

The RF unit 1545 can receive the D2D communication configuration information, the D2D SA grant, and the D2D SA grant from the base station 1500.

The processor 1535 receives information indicating whether the same SA is transmitted or the other SA is transmitted in the first multiplex transmission opportunity based on the D2D communication configuration information, the D2D SA grant, the D2D SA grant, and at least one and / 2 < / RTI > multiple transmission opportunity can be determined whether a single TB is transmitted or multiple TBs are transmitted.

The processor 1535 transmits at least one SA on the first multiplex transmission opportunity to the Rx terminal 1560 via the RF unit 1545 based on the D2D SA grant.

The processor 1535 transmits at least one data TB on the data RPT in the second multiplex transmission opportunity to the Rx terminal 1560 via the RF unit 1545 based on the D2D data grant.

The Rx terminal 1560 includes a processor 1565, a memory 1570, and an RF section 1575. Memory 1570 is coupled to processor 1565 to store various information for driving processor 1565. [ The RF unit 1575 is coupled to the processor 1565 to transmit and / or receive wireless signals. Processor 1565 implements the proposed functions, procedures and / or methods for performing the operations according to the present invention. The operation of Rx terminal 1560 in the above described embodiments may be implemented by processor 1565. [

RF section 1545 receives at least one SA and at least one TB from Tx terminal 1530. The processor 1565 performs a configuration for receiving D2D data based on the received at least one SA and determines whether a single or multiple TB is transmitted within a second multiplex transmission opportunity.

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 exemplary system described above, although the methods are described on the basis of a flowchart or a flowchart as a series of steps or blocks, the present invention is not limited to the order of steps, and some steps may be performed in a different order than the steps described above Can occur at the same time. It will also be appreciated by those skilled in the art that the steps depicted in the flowcharts or flowcharts are not exclusive and that other steps may be included or that one or more steps in a flowchart or flowchart may be deleted without affecting the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims

A method of supporting D2D (Device to Device) communication performed by a terminal,
Receiving D2D communication configuration information from a base station;
Receiving a D2D Scheduling Assignment (SA) grant from the base station;
Determining whether the same or different SA is transmitted on the first multiplex transmission opportunity based on the D2D communication configuration information and the D2D SA grant; And
And transmitting the same or another SA to the receiving terminal on the first multiplex transmission opportunity based on a determination as to whether the same or another SA is transmitted.

The method according to claim 1,
Receiving a D2D data grant from the base station;
Further comprising transmitting a single or multiple transport block (TB) to the receiving terminal on a second multiplex transmission opportunity based on the D2D data grant.

3. The method of claim 2,
Wherein the D2D communication configuration information is included in RRC (Radio Resource Control) signaling.

The method of claim 3,
Wherein the D2D configuration information includes information indicating whether the same SA is transmitted or the other SA is transmitted within the first multiplex transmission opportunity.

The method of claim 3,
Wherein the D2D configuration information includes parameters relating to multiple SA transmittable availability and a number of Resource Patterns for Transmission (RPT) for multiple transmission opportunities.

6. The method of claim 5,
When the parameter related to the multi-SA transmittable indicates multi-SA transmittable, the D2D configuration information includes at least one of a parameter relating to the number of retransmissions for SA transmission and a parameter related to a relation between each transmission opportunity and multiple SAs A method for supporting D2D communication, characterized by comprising

The method of claim 3,
Wherein the D2D configuration information includes parameter sets for D2D communication.

8. The method of claim 7,
A specific parameter set of the parameter sets is detected based on an SA transmission selection field included in the DCI indicating the D2D SA grant,
Wherein the determination as to whether the same or another SA is transmitted is performed based on the detected specific parameter set.

8. The method of claim 7,
The D2D SA grant is included in a Physical Downlink Control Channel (PDCCH) or an Enhanced PDCCH (EPDCCH)
A specific parameter set of the parameter sets is detected based on an SA transmission selection mask value detected as a result of blind decoding of the PDCCH or EPDCCH,
Wherein the determination as to whether the same or another SA is transmitted is performed based on the detected specific parameter set.

A terminal supporting D2D (Device to Device) communication,
An RF unit that receives D2D communication configuration information from a base station and receives a D2D Scheduling Assignment (SA) grant; And
And a processor for determining whether the same or another SA is transmitted on the first multiplex transmission opportunity based on the D2D communication configuration information and the D2D SA,
Wherein the RF unit transmits the same or another SA to the receiving terminal on the first multiplex transmission opportunity based on a determination as to whether the same or different SA is transmitted.

A method of supporting D2D (Device to Device) communication performed by a terminal,
Receiving D2D communication configuration information from a base station;
Receiving a D2D Scheduling Assignment (SA) grant from the base station;
Receiving a D2D data grant from the base station;
Sending an SA to a receiving terminal on a first multiplex transmission opportunity based on the D2D communication configuration information and the D2D SA grant;
Determining whether a single or multiple transport block (TB) is transmitted on the second multiplex transmission opportunity based on the D2D communication configuration information and the D2D data grant; And
And transmitting a single or multiple TB on the second multiplex transmission opportunity to the receiving terminal based on a determination as to whether the single or multiple TB is transmitted.

12. The method of claim 11,
Wherein the D2D communication configuration information is included in RRC (Radio Resource Control) signaling.

13. The method of claim 12,
Wherein the D2D configuration information includes information indicating whether a single TB or multiple TBs are transmitted within the second multiplex transmission opportunity.

13. The method of claim 12,
Wherein the D2D configuration information includes parameters related to multiple TB transmissibility and parameters relating to the number of Resource Patterns for Transmission (RPT) for multiple transmission opportunities.

15. The method of claim 14,
When the parameter related to the multiple TB transmittable indicates multi-TB transmittable, the D2D configuration information includes at least one of a parameter related to the number of retransmission times for TB transmission and a parameter related to a relation between each transmission opportunity and multiple TB A method for supporting D2D communication, characterized by comprising

13. The method of claim 12,
Wherein the D2D configuration information includes parameter sets for D2D communication.

17. The method of claim 16,
A specific parameter set of the parameter sets is detected based on a TB transmission selection field included in the DCI indicating the D2D data grant,
Wherein the determination as to whether the single or multiple TB is transmitted is performed based on the detected specific parameter set.

17. The method of claim 16,
The D2D data grant is included in a Physical Downlink Control Channel (PDCCH) or an Enhanced PDCCH (EPDCCH)
A specific parameter set of the parameter sets is detected based on a TB transmission selection mask value detected as a result of blind decoding of the PDCCH or EPDCCH,
Wherein the determination as to whether the single or multiple TB is transmitted is performed based on the detected specific parameter set.

A terminal supporting D2D (Device to Device) communication,
An RF unit for receiving D2D communication configuration information, a D2D SA (Scheduling Assignment) grant and a D2D data grant from a base station; And
A processor for configuring D2D communication configuration information and related parameters for D2D communication based on the D2D SA grant,
The processor determines whether a single or multiple transport block (TB) is transmitted on the second multiplex transmission opportunity based on the D2D communication configuration information and the D2D data grant,
The RF unit transmits the SA to the receiving terminal on the first multiplex transmission opportunity and the single or multiple TB on the second multiplex transmission opportunity based on the determination as to whether the single or multiple TB is transmitted to the receiving terminal Wherein the terminal is a mobile terminal.