An adaptive stop-and-wait ARQ strategy for mobile data communications

Automatic repeat request (ARQ) techniques are often used by a packet-switching data communication network to provide an error-free communications link between stations. In an effort to improve the throughput on a short-range, RF, packet-switching data communications network, an adaptive ARQ strategy applied to stop-and-wait (SW) protocols was developed. To provide a system designer with flexibility, different adaptive strategies for different systems and link conditions were developed. Examples of information transfer between two stations using the adaptive SW protocol are presented. A simulation to compute the throughput efficiency of several adaptive SW protocols was performed. A comparison of the throughput efficiencies of the simulated adaptive SW protocol with the nonadaptive SW protocol showed good gains could be achieved using the adaptive strategy when the networks are subject to high channel bit error rates