Method and apparatus of initial access in next generation cellular networks
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for internet of things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of a terminal for receiving data in a cellular network is provided. The method comprises receiving a synchronization signal block (SS block) including at least one synchronization signal and a broadcast channel from a base station, identifying an offset between the SS block and a resource block (RB) grid from system information in the broadcast channel, and determining the resource block grid based on the offset.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH);
identifying a subcarrier offset between the SSB and a resource block (RB) grid based on system information on the PBCH; and
identifying a location of the SSB based on the subcarrier offset,
wherein the subcarrier offset is defined by a number of subcarriers from a lowest subcarrier in a lowest RB overlapping with the SSB to a lowest subcarrier in the SSB,
wherein a value indicating the subcarrier offset is included in a master information block on the PBCH, and
wherein the subcarrier offset is indicated by a 4-bit value.
2. The method of claim 1 , wherein information on the lowest RB is included in a system information block 1 received from the base station.
3. The method of claim 1 , wherein an RB in the RB grid includes 12 consecutive subcarriers in a frequency domain.
4. The method of claim 1 , wherein a subcarrier spacing of the lowest RB is assumed as 15 kHz.
5. A method performed by a base station in a wireless communication system, the method comprising:
determining a resource block (RB) grid and a location of a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH); and
transmitting, to a terminal, the SSB based on the RB grid,
wherein information on a subcarrier offset between the SSB and the RB grid is transmitted in system information on the PBCH,
wherein the subcarrier offset is defined by a number of subcarriers from a lowest subcarrier in a lowest RB overlapping with the SSB to a lowest subcarrier in the SSB,
wherein a value indicating the subcarrier offset is included in a master information block on the PBCH, and
wherein the subcarrier offset is indicated by a 4-bit value.
6. The method of claim 5 , wherein information on the lowest RB is included in a system information block 1 transmitted to the terminal.
7. The method of claim 5 , wherein an RB in the RB grid includes 12 consecutive subcarriers in a frequency domain.
8. The method of claim 5 , wherein a subcarrier spacing of the lowest RB is assumed as 15 kHz.
9. A terminal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive signals; and
a controller coupled with the transceiver and configured to:
receive, from a base station, a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH),
identify a subcarrier offset between the SSB and a resource block (RB) grid based on system information on the PBCH, and
identify a location of the SSB based on the subcarrier offset,
wherein the subcarrier offset is defined by a number of subcarriers from a lowest subcarrier in a lowest RB overlapping with the SSB to a lowest subcarrier in the SSB,
wherein a value indicating the subcarrier offset is included in a master information block on the PBCH, and
wherein the subcarrier offset is indicated by a 4-bit value.
10. The terminal of claim 9 , wherein information on the lowest RB is included in a system information block 1 received from the base station.
11. The terminal of claim 9 , wherein an RB in the RB grid includes 12 consecutive subcarriers in a frequency domain.
12. The terminal of claim 9 , wherein a subcarrier spacing of the lowest RB is assumed as 15 kHz.
13. A base station in a wireless communication system, the base station comprising:
a transceiver configured to transmit and receive signals; and
a controller coupled with the transceiver and configured to:
determine a resource block (RB) grid and a location of a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH), and
transmit, to a terminal, the SSB based on the RB grid,
wherein information on a subcarrier offset between the SSB and the RB grid is transmitted in system information on the PBCH,
wherein the subcarrier offset is defined by a number of subcarriers from a lowest subcarrier in a lowest RB overlapping with the SSB to a lowest subcarrier in the SSB,
wherein a value indicating the subcarrier offset is included in a master information block on the PBCH, and
wherein the subcarrier offset is indicated by a 4-bit value.
14. The base station of claim 13 , wherein information on the lowest RB is included in a system information block 1 transmitted to the terminal.
15. The base station of claim 13 , wherein an RB in the RB grid includes 12 consecutive subcarriers in a frequency domain.
16. The base station of claim 13 , wherein a subcarrier spacing of the lowest RB is assumed as 15 kHz.