Transmission control method for HARQ in mobile communication system

A transmission control apparatus for hybrid automatic repeat request (HARQ) in a mobile communication system, the apparatus comprising:

• a processor;
• and
• a memory storing one or more computer programs configured to be executed by the processor, the one or more computer programs including instructions to:
• receive a downlink resource assignment on a downlink control channel,
• determine whether the received downlink resource assignment is for a user equipment's (UE's) cell-radio network temporary identifier (C-RNTI),
• determine whether a previous downlink resource assignment was a downlink assignment configured for a semi-persistence scheduling (SPS),
• determine, when the previous downlink resource assignment occurred, a HARQ entity of a HARQ process was indicated to receive data based on resources allocated according to the previous downlink resource assignment, and
• consider, if it is determined that the received downlink resource assignment is for the UE's C-RNTI and the previous downlink resource assignment was the downlink resource assignment configured for the SPS, and the HARQ entity of the HARQ process was indicated to receive data based on resources allocated according to the previous downlink resource assignment, when the previous downlink resource assignment was received, a new data indicator (NDI) of the downlink resource assignment to have been toggled regardless of a value of the NDI,
• wherein, if one or more transport blocks (TBs) are associated with the HARQ process, the NDI is defined for each TB.