Method for transmitting and receiving signal in wireless communication system, and apparatus for supporting same
Various embodiments of the present disclosure relate to a next-generation wireless communication system for supporting a higher data transmission rate than a 4G (4 th generation) wireless communication system. According to various embodiments of the present disclosure, a method of transmitting and receiving a signal in a wireless communication system, and an apparatus for supporting same may be provided.
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
transmitting (i) a sidelink-synchronization signal block (S-SSB) including a sidelink-primary synchronization signal (S-PSS), a sidelink-secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH) and (ii) a PSBCH demodulation-reference signal (DM-RS) for the PSBCH;
selecting a sidelink resource for transmitting a sidelink signal based on one or more preconfigured resource pools after transmitting the S-SSB; and
transmitting the sidelink signal based on the sidelink resource,
wherein:
the S-SSB is transmitted in a slot included in a period including a plurality of slots for transmission of the S-SSB;
one or more most significant bits (MSB) among a plurality of bits representing a slot index of the slot are transmitted based on the PSBCH; and
one or more least significant bits (LSB) among the plurality of bits are transmitted based on the PSBCH DM-RS.
2. The method of claim 1 , wherein a sequence generator for generating a sequence included in the PSBCH DM-RS is initialized based on a sidelink-service set identifier (SL-SSID) and the LSB.
3. The method of claim 1 , wherein the PSBCH is generated based on that (i) a master information block (MIB) is scrambled according to a first scrambling sequence for scrambling of the MIB and (ii) a PSBCH payload including the scrambled MIB is scrambled according to a second scrambling sequence for the PSBCH payload.
4. The method of claim 3 , wherein:
the first scrambling sequence is initialized based on an SL-SSID at beginning of the S-SSB; and
the second scrambling sequence is initialized based on the SL-SSID at beginning of the period.
5. The method of claim 1 , wherein:
a plurality of resource elements (REs) with the PSBCH DM-RS mapped thereto are configured with 4-comb on a frequency domain; and
positions of the plurality of REs on the frequency domain are shifted based on the SL-SSID.
6. The method of claim 1 , wherein:
an S-SSB index of the S-SSB is equal to a remainder obtained by dividing the slot index with L max ;
the L max is a maximum number of candidate S-SSBs to be transmitted by the S-SSB, determined according to subcarrier spacing (SCS);
the L max is 1 based on the SCS being 15 kHz;
the L max is 2 based on the SCS being 30 kHz;
the L max is 4 based on the SCS being 60 kHz; and
the L max is 8 based on the SCS being 120 KHz.
7. The method of claim 1 , wherein the PSBCH includes information related to time division duplex (TDD) slot configuration (TDD slot configuration) for a position of a candidate time resource for transmitting a sidelink data channel.
8. An apparatus operating in a wireless communication system, the apparatus comprising:
a memory; and
one or more processors connected to the memory,
wherein:
the one or more processors transmit (i) a sidelink-synchronization signal block (S-SSB) including a sidelink-primary synchronization signal (S-PSS), a sidelink-secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH) and (ii) a PSBCH demodulation-reference signal (DM-RS) for the PSBCH, selects a sidelink resource for transmitting a sidelink signal based on one or more preconfigured resource pools after transmitting the S-SSB, and transmits the sidelink signal based on the sidelink resource;
the S-SSB is transmitted in a slot included in a period including a plurality of slots for transmission of the S-SSB;
one or more most significant bits (MSB) among a plurality of bits representing a slot index of the slot are transmitted based on the PSBCH; and
one or more least significant bits (LSB) among the plurality of bits are transmitted based on the PSBCH DM-RS.
9. The apparatus of claim 8 , wherein a sequence generator for generating a sequence included in the PSBCH DM-RS is initialized based on a sidelink-service set identifier (SL-SSID) and the LSB.
10. The apparatus of claim 8 , wherein the PSBCH is generated based on that (i) a master information block (MIB) is scrambled according to a first scrambling sequence for scrambling of the MIB and (ii) a PSBCH payload including the scrambled MIB is scrambled according to a second scrambling sequence for the PSBCH payload.
11. The apparatus of claim 8 , wherein the apparatus communicates with one or more of a mobile user equipment (UE), a network, and an autonomous driving vehicle other than a vehicle including the apparatus.
12. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving (i) a sidelink-synchronization signal block (S-SSB) including a sidelink-primary synchronization signal (S-PSS), a sidelink-secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH) and (ii) a PSBCH demodulation-reference signal (DM-RS) for the PSBCH; and
receiving a sidelink signal included in one or more preconfigured resource pools based on a sidelink resource for receiving the sidelink signal after transmitting the S-SSB,
wherein:
the S-SSB is received in a slot included in a period including a plurality of slots for transmission of the S-SSB;
one or more most significant bits (MSB) among a plurality of bits representing a slot index of the slot are received based on the PSBCH; and
one or more least significant bits (LSB) among the plurality of bits are received based on the PSBCH DM-RS.
13. An apparatus operating in a wireless communication system, the apparatus comprising:
a memory; and
one or more processors connected to the memory,
the one or more processors receive a sidelink-synchronization signal block (S-SSB) including a sidelink-primary synchronization signal (S-PSS), a sidelink-secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH) and (ii) a PSBCH demodulation-reference signal (DM-RS) for the PSBCH, and receive a sidelink signal included in one or more preconfigured resource pools based on a sidelink resource for receiving the sidelink signal after transmitting the S-SSB,
wherein:
the S-SSB is received in a slot included in a period including a plurality of slots for transmission of the S-SSB;
one or more most significant bits (MSB) among a plurality of bits representing a slot index of the slot are received based on the PSBCH; and
one or more least significant bits (LSB) among the plurality of bits are received based on the PSBCH DM-RS.