Method and device for transmitting synchronization signal by means of sidelink terminal in wireless communication system
Provided is a method for transmitting a signal by means of a sidelink terminal in a wireless communication system, according to an embodiment of the present invention. The method for transmitting a signal comprises the steps of: selecting any one of an eNB and a gNB as a synchronization reference; and transmitting a sidelink channel/signal including an SSB (SS/PBCH block) on the basis of synchronization of the base station selected as the synchronization reference, wherein when dual connectivity (DC) is configured for the terminal, the terminal selects a master NB (NodeB) among the eNB as the synchronization reference. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, the BS or a network.
1. A method for transmitting a signal by a sidelink UE in a wireless communications system, the method comprising the steps of:
selecting, by the sidelink UE, one of an eNB (evolved NodeB) or a gNB (Next Generation Node B) as a synchronization reference;
generating, by the sidelink UE, one or more sidelink PSSs (Sidelink Primary Synchronization Signals) and one or more sidelink SSSs (Sidelink Secondary Synchronization Signals) based on a synchronization of the synchronization reference; and
transmitting, by the sidelink UE, a sidelink SSB (Sidelink Synchronization block) including the one or more sidelink PSSs and the one or more sidelink SSSs,
wherein, based on the one or more sidelink PSSs being a plurality of sidelink PSSs and a transmission periodicity of the sidelink SSB being longer than a transmission periodicity of an SSB received from the base station, at least one of a cyclic shift or a generating polynomial of the plurality of sidelink PSSs is different from at least one of a cyclic shift or a generating polynomial of the SSB received from the base station, respectively.
2. The method of claim 1 ,
wherein, based on dual connectivity (DC) being configured for the UE, the UE selects a master NB (NodeB) between the eNB and the gNB as the synchronization reference, and
wherein the master NB is the gNB for a NE (NR (New Radio) and an E-UTRA (Evolved UMTS (Universal Mobile Telecommunications System) Terrestrial Radio)), and is the eNB for EN (E-UTRA and NR) DC.
3. The method of claim 1 , wherein the UE selects NB having a high receiving power as a synchronization reference when dual connectivity (DC) is not configured for the UE.
4. The method of claim 1 , wherein the UE selects NB, which has received SIB (System Information Block) including sidelink related resource pool information, as a synchronization reference when dual connectivity (DC) is not configured for the UE.
5. The method of claim 1 , wherein the UE selects NB on a carrier paired with a carrier for which sidelink communication is performed, as a synchronization reference when dual connectivity (DC) is not configured for the UE.
6. The method of claim 1 , wherein the UE selects NB corresponding to a format for which sidelink communication is performed, as a synchronization reference when dual connectivity (DC) is not configured for the UE.
7. The method of claim 1 , wherein the eNB and the gNB have the same priority as a synchronization reference.
8. The method of claim 1 , wherein the eNB and the gNB are configured by the highest synchronization reference priority.
9. A sidelink UE for transmitting or receiving a signal in a wireless communication system, the sidelink UE comprising:
a memory; and
a processor coupled to the memory,
wherein the processor:
selects one of an eNB or a gNB as a synchronization reference,
generates one or more sidelink PSSs (Sidelink Primary Synchronization Signals) and one or more sidelink SSSs (Sidelink Secondary Synchronization Signals) based on a synchronization of the synchronization reference, and
transmits a sidelink SSB (Sidelink Synchronization block) including the one or more sidelink PSSs and the one or more sidelink SSSs,
wherein, based on the one or more sidelink PSSs being a plurality of sidelink PSSs and a transmission periodicity of the sidelink SSB being longer than a transmission periodicity of an SSB received from the base station, at least one of a cyclic shift or a generating polynomial of the plurality of sidelink PSSs is different from at least one of a cyclic shift or a generating polynomial of the SSB received from the base station, respectively.
10. The UE of claim 9 , wherein the sidelink UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, the BS or a network.