Downlink control information receiving method and user equipment, and downlink control information transmitting method and base station

A user equipment (UE) for receiving a signal, the UE comprising:

• a memory;
• and
• at least one processor coupled with the memory,
• wherein the at least one processor is configured to:
• obtain a coverage enhancement (CE) mode of the UE,
• wherein the CE mode is obtained as CE mode A based on that a physical random access channel (PRACH) CE level for the UE is a first CE level,
• wherein the CE mode is obtained as CE mode B based on that the PRACH CE level is a second CE level higher than the first CE level, and
• wherein based on that information on indicating the CE mode is received through a radio resource control signal, the CE mode is obtained as identical to the CE mode indicated by the information regardless of the PRACH CE level;
• decode downlink (DL) grant downlink control information (DCI);
• and
• receive a physical downlink shared channel (PDSCH) based on the DL grant DCI,
• wherein based on that:
• the CE mode is CE mode A,
• the DL grant DCI is decoded based on a first DCI format, and
• the CE mode is CE mode B,
• the DL grant DCI is decoded based on a second DCI format, and
• wherein the first DCI format and the second DCI format are different in at least a physical resource block (PRB) assignment field for DL reception, a hybrid automatic repeat request (HARQ) process number field, a transmit power control (TPC) command field for a physical uplink control channel (PUCCH), or a redundancy version (RV) field.

A method of transmitting a signal to a user equipment (UE) by a base station (BS), the method comprising:

• obtaining a coverage enhancement (CE) mode of the UE,
• wherein the CE mode is obtained as CE mode A based on that a physical random access channel (PRACH) CE level for the UE is a first CE level,
• wherein the CE mode is obtained as CE mode B based on that the PRACH CE level is a second CE level higher than the first CE level, and
• wherein based on that information on indicating the CE mode is transmitted through a radio resource control signal, the CE mode is obtained as identical to the CE mode indicated by the information regardless of the PRACH CE level;
• transmitting, to the UE, downlink (DL) downlink control information (DCI);
• and
• transmitting, to the UE, a physical downlink shared channel (PDSCH) based on the DL grant DCI,
• wherein based on that:
• the CE mode is CE mode A,
• the DL grant DCI is transmitted based on a first DCI format, and
• the CE mode is CE mode B,
• the DL grant DCI is transmitted based on a second DCI format, and
• wherein the first DCI format and the second DCI format are different in at least a physical resource block (PRB) assignment field for DL reception, a hybrid automatic repeat request (HARQ) process number field, a transmit power control (TPC) command field for a physical uplink control channel (PUCCH), or a redundancy version (RV) field.

A base station (BS) for transmitting a signal to a user equipment (UE), the BS comprising:

• a memory;
• and
• at least one processor coupled with the memory,
• wherein the at least one processor is configured to:
• obtain a coverage enhancement (CE) mode of the UE,
• wherein the CE mode is obtained as CE mode A based on that a physical random access channel (PRACH) CE level for the UE is a first CE level,
• wherein the CE mode is obtained as CE mode B based on that the PRACH CE level is a second CE level higher than the first CE level, and
• wherein based on that information on indicating the CE mode is transmitted through a radio resource control signal, the CE mode is obtained as identical to the CE mode indicated by the information regardless of the PRACH CE level;
• transmit, to the UE, downlink (DL) downlink control information (DCI);
• and
• transmit, to the UE, a physical downlink shared channel (PDSCH) based on the DL grant DCI,
• wherein based on that:
• the CE mode is CE mode A,
• the DL grant DCI is transmitted based on a first DCI format, and
• the CE mode is CE mode B,
• the DL grant DCI is transmitted based on a second DCI format, and
• wherein the first DCI format and the second DCI format are different in at least a physical resource block (PRB) assignment field for DL reception, a hybrid automatic repeat request (HARQ) process number field, a transmit power control (TPC) command field for a physical uplink control channel (PUCCH), or a redundancy version (RV) field.