On Orthogonal Band Allocation for Multi-User Mutli-Band Cognitive Radio Networks.
Ahmed El Shafie, Tamer M. Khattab · arXiv (Cornell University) · 2014
In this work, we study the problem of band allocation of $M_s$ buffered secondary users (SUs) to $M_p$ primary bands licensed to (owned by) $M_p$ buffered primary users (PUs). The bands are assigned to SUs in an orthogonal (one-to-one) fashion such that neither band sharing nor multi-band allocations are permitted. In order to study the fundamental limits on the performance of this system, the optimization problem used to obtain the stability region's envelope (closure) is established and is shown to be a linear program which can be solved efficiently. We compare our orthogonal allocation system with two typical low complexity and intuitive band allocation systems. In one system, each cognitive user chooses a band randomly with some assignment probability, while in the other system fixed (deterministic) band assignment is adopted throughout the lifetime of the network. We derive the stability regions of these two systems. We prove mathematically, as well as through numerical results, the advantages of our proposed orthogonal system over the other two systems.