Sidelink HARQ feedback transmission method and device thereof
Provided are a method and device for providing vehicle-to-everything (V2X) services in next generation wireless access technology (New RAT). The method controls the sidelink HARQ feedback operation by a terminal. A PSSCH scheduled by a PSCCH including sidelink control information is received from a transmitting terminal. Wireless resources of a PSFCH including HARQ feedback information regarding the PSSCH are determined and allocated in one symbol. The PSFCH, allocated in the one symbol, are repeatedly transmitted to the transmitting terminal in two consecutive symbols.
1. A method of controlling a sidelink HARQ feedback operation by a terminal, the method comprising:
receiving a PSSCH scheduled by a PSCCH including sidelink control information from a transmitting terminal;
determining wireless resources of a PSFCH including HARQ feedback information regarding the PSSCH and allocated in one symbol; and
repeatedly transmitting the PSFCH, allocated in the one symbol, to the transmitting terminal in two consecutive symbols,
wherein the PSFCH including the HARQ feedback information is a PSFCH format comprised of one symbol, the PSFCH format being transmitted by being repeatedly allocated to two consecutive symbols,
wherein the sidelink control information comprises first sidelink control information and second sidelink control information,
the first sidelink control information received via the PSCCH and the second sidelink control information received via the PSSCH,
wherein, when the PSSCH includes groupcast sidelink data, the PSSCH includes position information of the transmitting terminal, and
the position information of the transmitting terminal is included in the second sidelink control information, and includes zone ID information of the transmitting terminal.
2. The method according to claim 1 , wherein the wireless resources of the PSFCH are determined in accordance with minimum timing gap information per slot between the reception of the PSSCH and the transmission of the PSFCH, physical resource block set information regarding at least one physical resource block set for the PSFCH, and information regarding transmission slots in a resource pool in a PSFCH transmission occasion that is periodically allocated.
3. The method according to claim 2 , wherein the wireless resources of the PSFCH are determined in a first slot from among a plurality of slots allocated in the resource pool in the PSFCH transmission occasion present after a slot indicated by the minimum timing gap information, with respect to a last slot in which the PSSCH is received.
4. The method according to claim 1 , wherein the second sidelink control information received via the PSSCH is different from the sidelink control information including scheduling information regarding the PSSCH.
5. The method according to claim 1 , wherein the HARQ feedback information is determined in accordance with distance information calculated according to a position of the transmitting terminal and a position of the terminal and whether or not decoding of the groupcast sidelink data has succeeded.
6. The method according to claim 5 , wherein the HARQ feedback information is determined to be transmitted only when the decoding of the groupcast sidelink data has failed and the distance information is equal to or less than a predetermined threshold value, and includes HARQ-NACK information.
7. The method according to claim 5 , wherein the HARQ feedback information is determined to be transmitted including HARQ-ACK information depending on whether or not the decoding of the groupcast sidelink data has succeeded, when the distance information is equal to or greater than a predetermined threshold value.
8. The method according to claim 5 , wherein the HARQ feedback information is determined not to be transmitted irrespective of the distance information when the decoding of the groupcast sidelink data has succeeded.
9. A terminal controlling a sidelink HARQ feedback operation, the terminal comprising:
a receiver receiving a PSSCH scheduled by a PSCCH including sidelink control information from a transmitting terminal;
a controller determining wireless resources of a PSFCH including HARQ feedback information regarding the PSSCH and allocated in one symbol; and
a transmitter repeatedly transmitting the PSFCH, allocated in the one symbol, to the transmitting terminal in two consecutive symbols,
wherein the PSFCH including the HARQ feedback information is a PSFCH format comprised of one symbol, the PSFCH format being transmitted by being repeatedly allocated to two consecutive symbols,
wherein the sidelink control information comprises first sidelink control information and second sidelink control information,
the first sidelink control information received via the PSCCH and the second sidelink control information received via the PSSCH,
wherein, when the PSSCH includes groupcast sidelink data, the PSSCH includes position information of the transmitting terminal, and
the position information of the transmitting terminal is included in the second sidelink control information, and includes zone ID information of the transmitting terminal.
10. The terminal according to claim 9 , wherein the wireless resources of the PSFCH are determined in accordance with minimum timing gap information per slot between the reception of the PSSCH and the transmission of the PSFCH, physical resource block set information regarding at least one physical resource block set for the PSFCH, and information regarding transmission slots in a resource pool in a PSFCH transmission occasion that is periodically allocated.
11. The terminal according to claim 10 , wherein the wireless resources of the PSFCH are determined in a first slot from among a plurality of slots allocated in the resource pool in the PSFCH transmission occasion present after a slot indicated by the minimum timing gap information, with respect to a last slot in which the PSSCH is received.
12. The terminal according to claim 9 , wherein the HARQ feedback information is determined in accordance with distance information calculated according to a position of the transmitting terminal and a position of the terminal and whether or not decoding of the groupcast sidelink data has succeeded.