Sequential Overlapping HARQ Durations With Guaranteed Delay

In this letter, an overlapping Hybrid Automatic Repeat Request (HARQ) duration scheme for periodic time-critical packets is proposed to efficiently utilize wireless resources while guaranteeing delay constraints. In the proposed scheme, the HARQ duration for each packet is determined by partially overlapping it with the HARQ duration of the preceding packet, with the transmission of a packet being conditional on the completion of the preceding one. A novel mathematical analysis of the proposed scheme is presented. This analysis is used to derive both non-overlapping and overlapping HARQ durations for each packet. Numerical results demonstrate that the proposed scheme reduces the total HARQ duration for transmitting multiple time-critical packets and significantly improves throughput.