Performance evaluation of TDMA versus CSMA-based protocols in SINR models

Abstract

In this paper, we compare time division and carrier sense multiple access schemes (TDMA and CSMA) in a signal to noise and interference ratio (SINR)-based model. We assume that the network nodes are distributed a Poisson process evenly distributed and have pending packets. First we study the distribution of the SINR in TDMA-based protocols where the same time-slot is reserved in given radius of n hops (n = 2 in most of these protocols). The same study is carried for CSMA-based access protocols where the reuse is controlled with the carrier-sense threshold. We then compare the total throughput of TDMA and CSMA based access protocols in an outage model. In this model a packet is considered as correctly received if its SINR is above a given threshold. Finally, we conduct the same comparison between TDMA and CSMA-based access protocols in a model of adaptive coding. In this model, the actual SINR rules the transmission coding. We idealize the performance of this technique using the Shannon's well know formula W = W0log(1 + SINR).