QoS Performance Analysis of Cognitive Radio-Based Virtual Wireless Networks

Abstract

Abstract-Cognitive radio presents a new approach to wireless spectrum utilization and management. In this work, the potential performance improvement gained by applying cognitive radio to multiple-provider wireless systems is investigated. It is shown that virtual wireless networks can be created, utilizing only the residual wasted bandwidth of the primary service providers. These virtual networks are able to support large volumes of users, while still ensuring that QoS reliability requirements, such as blocking and dropping guarantees, are achieved. A Markov chain-based analysis of classic and cognitive systems is complemented by simulations in order to present a quantified perspective of the potential benefits of cognitive radio techniques.

An analytical performance model considering access strategy of an opportunistic spectrum sharing system

“…The call holding times of the PT and ST calls are assumed to be exponentially distributed with means 1/ μ 1 and 1/ μ 2 , respectively. These assumptions have been widely used in the literature and have been found to be reasonable as long as the number of users is much more than that of the channels in a service area. We further assume that both types of traffic occupy one channel for simplicity.…”

“…Some recent related works can be found in . In , an OSS system model based on a continuous‐time Markov chain is given and its performances, including blocking probability, reconnection probability, channel utilization, total carried traffic, etc. are evaluated.…”