Method of operating an HARQ buffer for a dynamic sub-frame change and an apparatus for same

A method of applying a Hybrid Automatic Repeat and request (HARQ) scheme at a transmission end supporting a dynamic resource change in a wireless communication system, the method comprising:

• configuring two or more groups from a plurality of Time Division Duplex (TDD) Uplink/Downlink (UL/DL) subframe configurations,
• wherein each of the plurality of TDD UL/DL subframe configurations has a corresponding maximum number of HARQ processes;
• transmitting control information for changing a currently applied first TDD UL/DL subframe configuration to a second TDD UL/DL subframe configuration to a reception end,
• wherein the first and second subframe configurations belong to a same group;
• and
• applying the HARQ scheme in accordance with a group-specific maximum number of HARQ processes regardless of a maximum number of HARQ processes corresponding to the second TDD UL/DL subframe configuration.

A user equipment (UE) configured to support a Hybrid Automatic Repeat and request (HARQ) scheme for applying a dynamic resource change in a wireless communication system, the device comprising:

• a radio frequency (RF) module configured to transmit and receive signals to and from a base station (BS);
• and
• a processor configured to process the signals and configured to:
• configure two or more groups from a plurality of Time Division Duplex (TDD) Uplink/Downlink (UL/DL) subframe configurations,
• wherein each of the plurality of TDD UL/DL subframe configurations has a corresponding maximum number of HARQ processes;
• control the RF module to receive control information for changing a currently applied first TDD UL/DL subframe configuration to a second TDD UL/DL subframe configuration from a transmission end,
• wherein the first and second subframe configurations belong to a same group;
• and
• apply the HARQ scheme in accordance with a group-specific maximum number of HARQ processes regardless of a maximum number of HARQ processes corresponding to the second TDD UL/DL subframe configuration.