A Novel High Capacity Transmission Frame Structure in Directional-Beam-Based Networks with Large Propagation Delays

Large propagation delay is a typical feature of wide-range wireless Ad hoc networks. Transmission frame structures in conventional data link protocols designed for such networks mitigate the impact of delays by using techniques such as guard interval, which reduces the effective transmission time of the network. However, large propagation delays can be used to enable more concurrent transmissions. In this paper, we derive the upper bound on the throughput of directional-beam-based networks with large propagation delays. Further, we present a novel transmission frame structure that regards the propagation delay as a buffer to achieve the upper bound of such networks and an algorithm to find an approximate frame length for general delays. Finally, simulation results verify that the proposed frame structure with the frame length obtained by the proposed algorithm achieves the much higher throughput compared with the existing counterparts.