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) including a master information block (MIB); and
identifying a resource block (RB) grid based on a subcarrier offset included in the MIB,
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, 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 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 kilohertz (kHz).
5. A method performed by a base station in a wireless communication system, the method comprising:
identifying a resource block (RB) grid based on a subcarrier offset; and
transmitting, to a terminal, a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH) including a master information block (MIB),
wherein the subcarrier offset is included in the MIB,
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, 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 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 kilohertz (kHz).
9. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from a base station via the transceiver, a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH) including a master information block (MIB), and
identify and a resource block (RB) grid based on a subcarrier offset included in the MIB,
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, 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 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 kilohertz (kHz).
13. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller configured to:
identify a resource block (RB) grid based on a subcarrier offset, and
transmit, to a terminal via the transceiver, a synchronization signal block (SSB) including at least one synchronization signal and a physical broadcast channel (PBCH) including a master information block (MIB),
wherein the subcarrier offset is included in the MIB,
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, 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 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 kilohertz (kHz).