Method for determining validity signal in wireless communication system supporting usage change of radio resource, and apparatus therefor

A user equipment (UE) configured not to support simultaneous reception and transmission of aggregated cells in a wireless communication system supporting carrier aggregation and reconfiguration of a radio resource, the UE comprising:

• a transmitter and a receiver;
• and
• a processor, operatively coupled to the transmitter and receiver, that:
• controls the receiver to receive, on a radio resource, in which a special subframe of a primary cell, based on a first uplink-downlink configuration, overlaps a downlink subframe of a secondary cell, downlink control information about the secondary cell, wherein the special subframe includes a Downlink Pilot Time Slot (DwPTS), Guard Period (GP) and Uplink Pilot Time Slot (UpPTS);
• monitors a reconfiguration message for configuring a second uplink-downlink configuration of the primary cell;
• and
• determines whether the downlink control information is valid based on the first and the second uplink-downlink configuration of the primary cell,
• wherein, when the radio resource is a subframe identified as a downlink subframe by the second uplink-downlink configuration and as a special subframe by the first uplink-downlink configuration, the downlink control information is determined to be valid, and
• wherein the first uplink-downlink configuration is configured by a system information block (SIB) and the second uplink-downlink configuration is configured by a reconfiguration message.

A method for transmitting a signal by a user equipment (UE) configured not to support simultaneous reception and transmission of aggregated cells in a wireless communication system supporting carrier aggregation and reconfiguration of a radio resource, the method comprising:

• receiving a sounding reference signal (SRS) triggering message for a secondary cell on a radio resource, in which a special subframe of a primary cell based on a first uplink-downlink configuration, overlaps a downlink subframe of the secondary cell, wherein the special subframe includes a Downlink Pilot Time Slot (DwPTS), Guard Period (GP) and Uplink Pilot Time Slot (UpPTS);
• monitoring a reconfiguration message for configuring a second uplink-downlink configuration of the primary cell;
• and
• determining whether the SRS triggering message is valid based on the first and the second uplink-downlink configuration of the primary cell,
• wherein, when the radio resource is a subframe identified as a downlink subframe by the second uplink-downlink configuration and as a special subframe by the first uplink-downlink configuration, the SRS triggering message is determined to be valid, and
• wherein the first uplink-downlink configuration is configured by a system information block (SIB) and the second uplink-downlink configuration is configured by a reconfiguration message.