Method for receiving system information in wireless communication system that supports narrowband IOT and apparatus for the same
A method for receiving system information performed by a terminal in a wireless communication system that supports Narrow Band (NB)-Internet of Things (IoT) includes receiving a Narrowband Synchronization Signal from a base station through narrowband (NB); acquiring time synchronization and frequency synchronization with the base station based on the Narrowband Synchronization Signal; and receiving the system information related to the NB-IoT from the base station through a Narrowband Physical Broadcast Channel (N-PBCH).
1. A method for receiving system information in a wireless communication system supporting Narrow Band (NB)-Internet of Things (IoT), the method performed by a terminal and comprising:
receiving an NB synchronization signal (NBSS) through an NB from a base station (BS);
acquiring time synchronization and frequency synchronization with the BS based on the received NBSS; and
receiving the system information related to the NB-IoT through an NB physical broadcast channel from the BS,
wherein the system information includes at least operation mode information indicating an operation mode of the NB-IoT system or channel information indicating a channel raster offset.
2. The method of claim 1 , wherein the operation mode is an in-band mode, a guard-band mode or a stand-alone mode.
3. The method of claim 2 , wherein the in-band mode includes a first in-band mode in which the NB-IoT system and a Long Term Evolution (LTE) system have a same Physical Cell ID (PCID) and a second in-band mode in which the NB-IoT system and the LTE system have different PCIDs.
4. The method of claim 3 , wherein the channel raster offset is +2.5 kHz, +7.5 kHz, −2.5 kHz or −7.5 kHz.
5. The method of claim 1 , wherein the system information is a Master Information Block.
6. The method of claim 1 , wherein the NB is a system bandwidth that corresponds to one Physical Resource Block (PRB) of a Long Term Evolution system.
7. The method of claim 6 , wherein the one PRB includes 12 subcarriers.
8. The method of claim 1 , wherein the NB synchronization signal includes an NB primary synchronization signal and an NB secondary synchronization signal.
9. The method of claim 1 , wherein the NB synchronization signal is generated using a Zadoff-Chu (ZC) sequence.
10. The method of claim 7 , wherein the NB primary synchronization signal is received through 11 contiguous subcarriers among the 12 subcarriers.
11. A terminal for receiving system information in a wireless communication system supporting narrowband (NB)-Internet of Things (IoT), the terminal comprising:
a Radio Frequency (RF) unit for transmitting and receiving a radio signal; and
a processor for:
controlling the RF unit to receive an NB synchronization signal (NBSS) through an NB from a base station (BS);
acquiring time synchronization and frequency synchronization with the BS based on the received NBSS; and
controlling the RF unit to receive the system information related to the NB-IoT through an NB physical broadcast channel from the BS,
wherein the system information includes at least one of operation mode information indicating an operation mode of the NB-IoT system or channel raster offset information indicating a channel raster offset.
12. The terminal of claim 11 , wherein the operation mode is an in-band mode operated in an in-band, a guard-band mode operated in a guard-band or a stand-alone mode operated in stand-alone.
13. The terminal of claim 12 , wherein the in-band mode includes a first in-band mode in which the NB-IoT system and a Long Term Evolution (LTE) system have a same Physical Cell ID (PCID) and a second in-band mode in which the NB-IoT system and LTE system have different PCIDs.
14. The terminal of claim 13 , wherein the channel raster offset is +2.5 kHz, +7.5 kHz, −2.5 kHz or −7.5 kHz.
15. The terminal of claim 11 , wherein the system information is a Master Information Block.
16. The terminal of claim 11 , wherein the NB is a system bandwidth that corresponds to one Physical Resource Block (PRB) of a Long Term Evolution system.
17. The terminal of claim 16 , wherein the one PRB includes 12 subcarriers.
18. The terminal of claim 11 , wherein the NB synchronization signal includes an NB primary synchronization signal and an NB secondary synchronization signal.
19. The terminal of claim 11 , wherein the NB synchronization signal is generated using a Zadoff-Chu (ZC) sequence.
20. The terminal of claim 17 , wherein the NB primary synchronization signal is received through 11 contiguous subcarriers among the 12 subcarriers.