Bandwidth partitioning in random-access Poisson networks: Stability, throughput and delay

Abstract

In this paper, we consider an interference-limited multi-user large-scale wireless network with two user classes sharing a given frequency band. Each source has an infinite buffer, where packets are queued for transmission. We are interested in the scenario in which the available frequency band is partitioned among users of one class, such that users of this class can access only a fraction of the original bandwidth available to the network. The motivation for such bandwidth partitioning is to reduce the interference among users, leading to a higher network capacity. Expressions for the stability region, transmission success probability, and average delay are derived based on stochastic geometry and queueing theory. Results show that, under certain conditions, bandwidth partitioning can improve the network performance in terms of lower mean delays and higher maximum arrival rates for which queues remain stable.