Method and apparatus for performing initial access in wireless communication system
Provided are a method and an apparatus for performing physical resource block (PRB) indexing in a wireless communication system. A user equipment (UE) receives information on an offset between a synchronization signal (SS) block and a system bandwidth from a network through the SS block and performs the PRB indexing on the system bandwidth on the basis of the information on the offset.
1. A method for performed by a wireless device in a wireless communication system, the method comprising:
receiving, from a network through a synchronization signal (SS) block, information regarding an offset between the SS block and a system bandwidth;
determining a physical resource block (PRB) index of the system bandwidth based on the information regarding the offset;
receiving a transmission of a reference signal from the network; and
receiving, based on the reference signal, data from the network via a bandwidth specified to the wireless device,
wherein, in case the data comprises remaining minimum system information (RMSI), the reference signal is processed for the transmission based on a PRB indexing for a partial frequency region in the system bandwidth, and
wherein, in case the data excludes the RMSI, the reference signal is processed for the transmission based on a PRB indexing for the system bandwidth.
2. The method of claim 1 , wherein the information regarding the offset comprises information regarding an offset between (i) a PRB of the lowest index of the SS block and (ii) a PRB of the lowest index of the system bandwidth.
3. The method of claim 1 , wherein the information regarding the offset comprises information regarding an offset between (i) a subcarrier 0 of the SS block and (ii) a subcarrier 0 of the system bandwidth.
4. The method of claim 1 , wherein the information regarding the offset comprises information regarding an offset between (i) a center of the SS block and (ii) a center of the system bandwidth.
5. The method of claim 1 , wherein the SS block further comprises information regarding the system bandwidth.
6. The method of claim 5 , wherein the information regarding the system bandwidth comprises information regarding a potential maximum bandwidth in which a carrier is operated.
7. The method of claim 1 , wherein the SS block is comprised in an initial uplink (UL) bandwidth part (BWP).
8. The method of claim 1 , wherein the information regarding the offset is expressed as a value of a channel raster or a synchronization raster.
9. A wireless device configured to operate in a wireless communication system, the wireless device comprising:
a memory;
a transceiver; and
at least one processor, operably coupled to the memory and the transceiver, and configured to:
control the transceiver to receive, from a network through a synchronization signal (SS) block, information regarding an offset between the SS block and a system bandwidth;
determine a physical resource block (PRB) index of the system bandwidth based on the information regarding the offset;
control the transceiver to receive a transmission of a reference signal from the network; and
control the transceiver to receive, based on the reference signal, data from the network via a bandwidth specified to the wireless device,
wherein, in case the data comprises remaining minimum system information (RMSI), the reference signal is processed for the transmission based on a PRB indexing for a partial frequency region in the system bandwidth, and
wherein, in case the data excludes the RMSI, the reference signal is processed for the transmission based on a PRB indexing for the system bandwidth.
10. The wireless device of claim 9 , wherein the information regarding the offset comprises information regarding an offset between (i) a PRB of the lowest index of the SS block and (ii) a PRB of the lowest index of the system bandwidth.
11. The wireless device of claim 9 , wherein the information regarding the offset comprises information regarding an offset between (i) a subcarrier 0 of the SS block and (ii) a subcarrier 0 of the system bandwidth.
12. The wireless device of claim 9 , wherein the information regarding the offset comprises information regarding an offset between (i) a center of the SS block and (ii) a center of the system bandwidth.
13. The wireless device of claim 9 , wherein the SS block further comprises information regarding the system bandwidth.
14. The wireless device of claim 13 , wherein the information regarding the system bandwidth comprises information regarding a potential maximum bandwidth in which a carrier is operated.
15. The wireless device of claim 9 , wherein the SS block is comprised in an initial uplink (UL) bandwidth part (BWP).
16. The wireless device of claim 9 , wherein the information regarding the offset is expressed as a value of a channel raster or a synchronization raster.