| CPC H04L 1/0003 (2013.01) [H04L 5/14 (2013.01); H04W 56/0045 (2013.01)] | 11 Claims |

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1. A base station (BS) comprising:
a transceiver; and
a processor,
wherein
the transceiver is configured to receive channel quality indicator (CQI) information from a user equipment (UE);
the processor is configured to select a first modulation and coding scheme (MCS) level from among one or more MCS levels based on the CQI information;
the transceiver is configured to transmit, to the UE, data to which the selected first MCS level is applied, in a full duplex (FD) transmission mode, and is configured to receive, from the UE, acknowledgment/negative acknowledgment (ACK/NACK) information for the transmitted data; and
based on the first MCS level being changed to a second MCS level, the processor is configured to determine whether to switch the FD transmission mode based on whether a first timing advance (TA) value measured for the UE greater than or equal to a TA threshold configured for the second MCS level.
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