PERFORMANCE EVALUATION OF PREEMPTIVE POLLING SCHEMES AND ARQ TECHNIQUES FOR INDOOR WIRELESS NETWORKS

This paper examines a radio-based indoor communication network with a single radio channel shared by several data terminals. By enabling the terminals to communicate with each other and access the resources of a wired network, the system is a potential provider of in-building LAN -like services. In this indoor fading environment, a base-station appr oach is assumed. In the analysis, a two-state Markov chain model is us ed to model the nonstationary transmission channel. Two preemptive pol ling multiple-access schemes combine with ARQ error-control schemes to counteract the effects of a nonstationary transmission channel. The m ain idea here devised is that of making the service interruption depen dent on the propagation conditions of the transmission channel by moni toring the outcomes of the data packet transmission attempts. A perfor mance comparison reveals the superiority of the preemptive polling sys tems with respect to a classical TDMA scheme.