Communication Apparatus Intermittent Reception ACK NACK Timing

The receiving apparatus dynamically adjusts its reception operation timing based on the type of signal transmitted. When a NACK signal is transmitted, the receiving apparatus performs reception operations during a longer period including both the first retransmission timing and second retransmission timing. When an ACK signal is transmitted, the receiving apparatus performs reception operations only during the first retransmission timing. This dynamic adjustment optimizes energy usage while maintaining reliable data transmission through retransmission control.

The retransmission control mechanism is segmented based on signal type. The receiving apparatus divides reception operation timing into different periods: a longer period when NACK is transmitted (covering both first and second retransmission timings) and a shorter period when ACK is transmitted (covering only first retransmission timing). This segmentation simplifies the control logic by creating distinct reception patterns for different signal types, making the overall system more manageable despite multiple retransmission opportunities.

The receiving unit operates periodically rather than continuously, with activation timing determined by the transmitted signal type. When NACK is transmitted, the receiving unit activates during periods covering both first and second retransmission timings. When ACK is transmitted, the receiving unit activates only during the first retransmission timing period. This periodic operation pattern ensures reliable data reception while minimizing power consumption by keeping the receiving unit off during unnecessary periods.