Coordinated coalition formation in throughput‐efficient cognitive radio networks. Issue 8 (6th February 2015)

• Record Type: Journal Article
• Authors: Umar, Raza; Mesbah, Wessam
• Is Part Of: Wireless communications and mobile computing. Volume 16:Issue 8(2016)
• Page Start: 912
• Page End: 928
• Publication Date: 2015-02-06
• Subjects: cognitive radio -- coalition formation -- Nash‐stable partition -- throughput‐efficient partition -- optimal bandwidth allocation; Wireless communication systems -- Periodicals; Mobile communication systems -- Periodicals; 621.38205
• DOI: 10.1002/wcm.2568
• Languages: English
• ISSNs: 1530-8669

Abstract

Abstract: In this paper, we consider the problem of joint coalition formation (CF) and bandwidth allocation in cognitive radio networks. We assume that the secondary links will be partitioned into disjoint coalitions, by which the available spectrum will be reused. On the other hand, we assume that the members of each coalition will transmit over orthogonal sub‐bands with the available spectrum being optimally allocated among them. We formulate the problem as a coordinated CF game, where the optimization is held at a secondary coordinator that has all the required channel information. Given these assumptions, we derive a closed‐form expression of the optimal bandwidth allocation for any given network partition, and we propose an efficient algorithm to reach a Nash‐stable partition (coalition structure), with the objective of improving the network throughput. Furthermore, we provide a probabilistic analysis of the stability of a grand structure and a singleton structure, and we employ this to obtain a lower bound on the stability of a general coalition structure (other than grand and singleton). Performance analysis shows that the proposed CF algorithm with optimal bandwidth allocation provides a substantial gain in the network throughput over existing CF techniques as well as the simple cases of singleton and grand coalitions. Copyright © 2015 John Wiley & Sons, Ltd. Abstract : This paper considers the problem of joint coalition formation and bandwidth allocation in cognitive radio networks. The secondary links are partitioned into disjoint coalitions, by which the available spectrum is reused. A closed‐form expression of the optimal bandwidth allocation for any given coalition structure is derived, and an efficient algorithm to reach the Nash equilibrium coalition structure is presented, with the objective of maximizing the total network rate. Numerical simulations show significant network throughput improvement over existing coalition formation algorithms.