Method and device for transmitting and receiving signals in wireless communication system
A method and device for transmitting and receiving signals in a wireless communication system according to an embodiment of the present invention receive Random Access Channel (RACH) configurations, and transmit random access preambles on a specific RACH occasion (RO) on the basis of the RACH configurations. The number of reference points in a cell is derived on the basis of the number of the RACH configurations, and the reference points can have respective initial Timing Advance (TA) values for the RACH process.
1. A method of transmitting and receiving signals by a user equipment supportive of a Non-Terrestrial Network (NTN) in a wireless communication system, the method comprising:
receiving System Information Block (SIB) including NTN-specific parameters for a serving cell,
wherein the NTN-specific parameters for the serving cell includes (i) a parameter for a common Timing Advance (TA) value and (ii) a parameter for a drift rate of the common TA value;
determining a TA value related to a serving satellite for the serving cell based on the first common TA value, the drift rate, a specific time and a current time; and
transmitting a signal based on the TA value related to the serving satellite,
wherein the common TA value is a timing offset that is equal to a Round Trip Time (RTT) between the serving satellite and a reference point, where the reference point is located in a feeder link.
2. The method of claim 1 , wherein the specific time is a reference time related to the common TA value, and
wherein a parameter for the specific time is included in the SIB.
3. The method of claim 1 ,
wherein the SIB further includes a parameter for an ephemeris of the serving satellite, and
wherein the TA value related to the serving satellite is determined based on a position of the serving satellite by the ephemeris and a position of the UE.
4. A user equipment supportive of a Non-Terrestrial Network (NTN) to transmit and receive signals in a wireless communication system, the user equipment comprising:
at least one transceiver;
at least one processor; and
at least one memory operably connected to the at least one processor and storing instructions enabling the at least one processor to perform a specific operation when executed, the specific operation comprising:
receiving System Information Block (SIB) including NTN-specific parameters for a serving cell,
wherein the NTN-specific parameters for the serving cell includes (i) a parameter for a common Timing Advance (TA) value and (ii) a parameter for a drift rate of the common TA value;
determining a TA value related to a serving satellite for the serving cell based on the first common TA value, the drift rate, a specific time and a current time; and
transmitting a signal based on the TA value related to the serving satellite,
wherein the common TA value is a timing offset that is equal to a Round Trip Time (RTT) between the serving satellite and a reference point, where the reference point is located in a feeder link.
5. The user equipment of claim 4 ,
wherein the information the specific time is a reference time related to the common TA value, and
wherein a a parameter for the specific time is included in the SIB.
6. The user equipment of claim 4 ,
wherein the SIB further includes a parameter for a ephemeris of the serving satellite, and
wherein the TA value related to the serving satellite is determined based on a position of the serving satellite by the ephemeris and a position of the UE.