Method for performing sidelink communication and device therefor
The present disclosure relates to a method and device for providing a V2X service in a next generation radio access technology (new RAT). The present embodiments provide a method for performing sidelink communication by a terminal and a device therefor, the method comprising the steps of: receiving sidelink synchronization block (SSB) configuration information including synchronization information for sidelink communication; monitoring a SSB monitoring slot configured on the basis of the SSB configuration information; and receiving a SSB in the SSB monitoring slot, wherein the SSB comprises a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH), and the S-PSS, the S-SSS, and the PSBCH are allocated to N consecutive symbols in the SSB monitoring slot.
1. A method of performing sidelink communications by a transmitting terminal, the method comprising:
receiving sidelink synchronization signal block (S-SSB) configuration information for sidelink communications; and
receiving an S-SSB in an S-SSB monitoring slot in accordance with the S-SSB configuration information,
wherein the S-SSB is comprised of a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH), and the S-PSS, the S-SSS, and the PSBCH are allocated to N number of consecutive symbols in the S-SSB monitoring slot,
wherein the S-SSB comprises two S-PSS symbols, two S-SSS symbols, and N−4 number of PSBCH symbols,
wherein, when the S-SSB monitoring slot is a normal cyclic prefix, the N is 13, and when S-SSB monitoring slot is an extended cyclic prefix, the N is 11, and the S-SSB is comprised of 132 subcarriers, and
wherein the S-SSB is configured such that the PSBCH is allocated to symbol index 0 in the S-SSB monitoring slot, the S-PSS is allocated to symbol indices 1 and 2 in the S-SSB monitoring slot, the S-SSS is allocated to symbol indices 3 and 4 in the S-SSB monitoring slot, and the PSBCH is allocated to symbol indices 5 to N−1 in the S-SSB monitoring slot.
2. The method according to claim 1 , wherein the S-SSB configuration information includes at least one from among subcarrier index information of a frequency domain in which the S-SSB is transmitted, information regarding the number of the S-SSBs transmitted within a period of a single sidelink synchronization signal, offset information from a start point of the period of the sidelink synchronization signal to a first S-SSB monitoring slot, and interval information between S-SSB monitoring slots.
3. The method according to claim 2 , wherein the period of the single sidelink synchronization signal is set to be 16 frames and 160 ms, and the number of the S-SSBs is set to be within a differential range according to a subcarrier spacing set to a frequency range in which the S-SSBs are transmitted.
4. The method according to claim 3 , wherein the number of the S-SSBs is 1 or 2 when the subcarrier spacing is 15 kHz, is 2 or 4 when the subcarrier spacing is 30 kHz, and is 1, 2, 4 or 8 when the subcarrier spacing is 60 kHz.
5. A method of controlling sidelink communications by a base station, the method comprising:
transmitting sidelink synchronization signal block (S-SSB) configuration information for sidelink communications to a terminal; and
transmitting an S-SSB in an S-SSB monitoring slot configured in accordance with the S-SSB configuration information,
wherein the S-SSB is comprised of a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH), and the S-PSS, the S-SSS, and the PSBCH are allocated to N number of consecutive symbols in the S-SSB monitoring slot,
wherein the S-SSB comprises two S-PSS symbols, two S-SSS symbols, and N−4 number of PSBCH symbols,
wherein, when the S-SSB monitoring slot is a normal cyclic prefix, the N is 13, and when S-SSB monitoring slot is an extended cyclic prefix, the N is 11, and the S-SSB is comprised of 132 subcarriers, and
wherein the S-SSB is configured such that the PSBCH is allocated to symbol index 0 in the S-SSB monitoring slot, the S-PSS is allocated to symbol indices 1 and 2 in the S-SSB monitoring slot, the S-SSS is allocated to symbol indices 3 and 4 in the S-SSB monitoring slot, and the PSBCH is allocated to symbol indices 5 to N−1 in the S-SSB monitoring slot.
6. The method according to claim 5 , wherein the S-SSB configuration information includes at least one from among subcarrier index information of a frequency domain in which the S-SSB is transmitted, information regarding the number of the S-SSBs transmitted within a period of a single sidelink synchronization signal, offset information from a start point of the period of the sidelink synchronization signal to a first S-SSB monitoring slot, and interval information between S-SSB monitoring slots.
7. The method according to claim 6 , wherein the period of the single sidelink synchronization signal is set to be 16 frames and 160 ms, and the number of the S-SSBs is set to be within a differential range according to a subcarrier spacing set to a frequency range in which the S-SSBs are transmitted.
8. The method according to claim 7 , wherein the number of the S-SSBs is 1 or 2 when the subcarrier spacing is 15 kHz, is 2 or 4 when the subcarrier spacing is 30 kHz, and is 1, 2, 4 or 8 when the subcarrier spacing is 60 kHz.
9. A terminal performing sidelink communications, comprising:
a receiver receiving sidelink synchronization signal block (S-SSB) configuration information for sidelink communications; and
a controller monitoring an S-SSB monitoring slot configured in accordance with the S-SSB configuration information,
wherein the receiver receives an S-SSB in the S-SSB monitoring slot,
wherein the S-SSB is comprised of a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH), and the S-PSS, the S-SSS, and the PSBCH are allocated to N number of consecutive symbols in the S-SSB monitoring slot,
wherein the S-SSB comprises two S-PSS symbols, two S-SSS symbols, and N−4 number of PSBCH symbols,
wherein, when the S-SSB monitoring slot is a normal cyclic prefix, the N is 13, and when S-SSB monitoring slot is an extended cyclic prefix, the N is 11, and the S-SSB is comprised of 132 subcarriers, and
wherein the S-SSB is configured such that the PSBCH is allocated to symbol index 0 in the S-SSB monitoring slot, the S-PSS is allocated to symbol indices 1 and 2 in the S-SSB monitoring slot, the S-SSS is allocated to symbol indices 3 and 4 in the S-SSB monitoring slot, and the PSBCH is allocated to symbol indices 5 to N−1 in the S-SSB monitoring slot.
10. The terminal according to claim 9 , wherein the S-SSB configuration information includes at least one from among subcarrier index information of a frequency domain in which the S-SSB is transmitted, information regarding the number of the S-SSBs transmitted within a period of a single sidelink synchronization signal, offset information from a start point of the period of the sidelink synchronization signal to a first S-SSB monitoring slot, and interval information between S-SSB monitoring slots.