Patent ID: 11968156
Assignee: LG ELECTRONICS INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A terminal configured for receiving system information in a time division duplex (TDD) system supporting narrowband-Internet of things (NB-IoT), the terminal comprising:
a transmitter configured to transmit a radio signal;
a receiver configured to receive the radio signal; and
a processor configured to control the transmitter and the receiver,
wherein the processor is further configured to:
receive, from a base station, Master Information Block-Narrow Band (MIB-NB) through an anchor carrier, wherein the MIB-NB includes operation mode information,
wherein a location of a non-anchor carrier for receiving System Information Block1-Narrow Band (SIB1-NB) is based on the operation mode information; and
receive, from the base station, the SIB1-NB through the non-anchor carrier, and
wherein, based on the operation mode information representing an operation mode of the anchor carrier as a guard band mode, the operation mode information includes information representing a specific state among a plurality of pre-defined states related to the non-anchor carrier,
wherein, based on the information representing the specific state:
i) an operation mode of the non-anchor carrier is determined as the guard band mode or an in-band mode,
ii) the location of the non-anchor carrier is determined as a predefined location based on that the operation mode of the non-anchor carrier is determined as the guard band mode, and
iii) the location of the non-anchor carrier is determined as a location based on a Physical Resource Block (PRB) within an LTE system bandwidth, based on that the operation mode of the non-anchor carrier is determined as the in-band mode, and
iv) whether the non-anchor carrier is related to in-band different PCI mode or in-band same PCI mode is determined based on that the operation mode of the non-anchor carrier is determined as the in-band mode,
wherein, based on that the operation mode related to the non-anchor carrier is determined as the in-band different PCI mode, the MIB-NB includes port information related to at least one of number of cell-specific reference signal (CRS) ports or number of narrowband reference signal (NRS) ports,
wherein the number of the CRS ports or the NRS ports is related to the reception of the SIB1-NB,
wherein the PRB within the LTE system bandwidth is a lowest PRB or a highest PRB, which is adjacent to the anchor carrier,
wherein the predefined location is based on i) a first side in which the anchor carrier is located among two sides related to edges of the LTE system bandwidth or ii) a second side opposite to the first side in which the anchor carrier is located among the two sides related to the edges of the LTE system bandwidth,
wherein, based on the information representing the specific state related to the guard band mode including a first value or a second value different from the first value:
the predefined location is determined as the first side based on the first value,
the predefined location is determined as the second side based on the second value.