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Efficient and fair bandwidth allocation in multichannel cognitive radio networks (2012)
| Venue: | IEEE Trans. Mobile Computing |
| Citations: | 2 - 0 self |
BibTeX
@ARTICLE{Xu12efficientand,
author = {Dan Xu and Student Member and Eric Jung and Student Member and Xin Liu},
title = {Efficient and fair bandwidth allocation in multichannel cognitive radio networks},
journal = {IEEE Trans. Mobile Computing},
year = {2012},
pages = {1372--1385}
}
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Abstract
Abstract—Cognitive radio (CR) improves spectrum efficiency by allowing secondary users (SUs) to dynamically exploit the idle spectrum owned by primary users (PUs). This paper studies optimal bandwidth allocation of SUs for throughput efficiency. Consider the following tradeoff: an SU increases its instantaneous throughput by accessing more spectrum, but channel access/switching overhead, contention among multiple SUs, and dynamic PU activity create higher liability for larger bandwidths. So how much is too much? In this paper, we study the optimal bandwidth allocation for multiple SUs. Our approach is twofold. We first study the optimal bandwidth an SU should use to maximize the per-SU throughput in the long term. The optimal bandwidth is derived in the context of dynamic PU activity, where we consider both independent and correlated PU channel scenarios while accounting for the effects of channel switching overhead. We further consider the case of suboptimal spectrum use by SUs in the short term due to PU activity dynamics. We propose an efficient channel reconfiguration (CREC) scheme to improve SUs ’ performance. We use real PU channel activity traces in the simulations to validate our results. The work sheds light on the design of spectrum sharing protocols in cognitive radio networks. Index Terms—Cognitive radio, opportunistic spectrum access, bandwidth allocation, channel correlation. Ç 1
Keyphrases
fair bandwidth allocation multichannel cognitive radio network bandwidth allocation optimal bandwidth multiple sus work shed optimal bandwidth allocation spectrum efficiency long term dynamic pu activity short term suboptimal spectrum use paper study dynamic pu activity create primary user idle spectrum pu activity dynamic secondary user sus performance opportunistic spectrum access throughput efficiency cognitive radio network channel correlation efficient channel reconfiguration per-su throughput real pu channel activity trace correlated pu channel scenario instantaneous throughput abstract cognitive radio index term cognitive radio channel access
