Method for device-to-device communication in wireless communication system and apparatus therefor
Disclosed are a method for device-to-device communication in a wireless communication system, and an apparatus therefor. Specifically, the present invention relates to a method for performing device-to-device (D2D) communication by a terminal in a wireless communication system, the method comprising the steps of: receiving, from a base station, physical sidelink control channel (PSCCH) resource pool setting information; receiving, from the base station, downlink control information (DCI) including the PSCCH resource allocation information; and sending the PSCCH on the basis of the PSCCH resource allocation information, wherein a first PSCCH time-frequency resource and a second PSCCH time-frequency resource for sending the PSCCH are determined on the basis of a value indicated in the PSCCH resource allocation information within the PSCCH resource pool, and the PSCCH may be sent in the first PSCCH time-frequency resource and the second PSCCH time-frequency resource.
1. A method for performing a Device-to-Device (D2D) communication performed by a user equipment in a wireless communication system, comprising:
receiving Physical Sidelink Control Channel (PSCCH) resource pool configuration information from a eNB;
receiving Downlink Control Information (DCI) that includes PSCCH resource allocation information from the eNB; and
transmitting the PSCCH based on the PSCCH resource allocation information,
wherein a first PSCCH time-frequency resource and a second PSCCH time-frequency resource for transmitting the PSCCH are determined based on a scheduling assignment (SA) index determined in the PSCCH resource allocation information within the PSCCH resource pool,
wherein the PSCCH is transmitted in the first PSCCH time-frequency resource and the second PSCCH time-frequency resource,
wherein the SA index is mapped to a logical index of the first PSCCH time-frequency resource according to a first mapping rule,
wherein the logical index of the PSCCH time-frequency resource is mapped to a physical index of the second PSCCH time-frequency resource according to a second mapping rule,
wherein the second mapping rule comprises mapping the logical index to the physical index at an interval of a specific value, when a number of the physical index is larger than a number of the SA index, and
wherein the specific value is a quotient formed by dividing the number of the physical index by the number of the SA index.
2. The method for performing the D2D communication of claim 1 ,
wherein the logical index is first mapped in the PSCCH time-frequency resource of time domain, and then mapped in the PSCCH time-frequency resource of frequency domain.
3. The method for performing the D2D communication of claim 1 ,
wherein a domain of the logical index is divided into a plurality of groups, and
wherein each of the plurality of groups is mapped to a domain of the physical index.
4. The method for performing the D2D communication of claim 1 ,
wherein the SA index is increased as much as a predetermined offset and mapped to the logical index.
5. The method for performing the D2D communication of claim 4 ,
wherein the offset value is variable depending on a subframe index or a PSCCH period, and
wherein an initial value of the offset value is configured by a Cell-Radio Network Temporary Identifier (C-RNTI) or a Sidelink-RNTI (S-RNTI).
6. The method for performing the D2D communication of claim 1 ,
wherein the PSCCH resource pool is divided into a plurality of resource regions in frequency domain, and
wherein the logical index of the PSCCH time-frequency resource is sequentially mapped to each resource region.
7. A user equipment for performing a Device-to-Device (D2D) communication in a wireless communication system, comprising:
a radio frequency (RF) unit including a transceiver for transmitting and receiving a wireless signal; and
a processor,
wherein the processor is configured to perform:
receiving Physical Sidelink Control Channel (PSCCH) resource pool configuration information from a eNB;
receiving Downlink Control Information (DCI) that includes PSCCH resource allocation information from the eNB; and
transmitting the PSCCH based on the PSCCH resource allocation information,
wherein a first PSCCH time-frequency resource and a second PSCCH time-frequency resource for transmitting the PSCCH are determined based on a scheduling assignment (SA) index determined in the PSCCH resource allocation information within the PSCCH resource pool,
wherein the PSCCH is transmitted in the first PSCCH time-frequency resource and the second PSCCH time-frequency resource,
wherein the SA index determined by the PSCCH resource allocation information is mapped to a logical index of the first PSCCH time-frequency resource according to a first mapping rule,
wherein the logical index of the PSCCH time-frequency resource is mapped to a physical index of the second PSCCH time-frequency resource according to a second mapping rule,
wherein the second mapping rule comprises mapping the logical index to the physical index at an interval of a specific value, when a number of the physical index is larger than a number of the SA index, and
wherein the specific value is a quotient formed by dividing the number of the physical index by the number of the SA index.