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Asymmetric Joint Scheduling and Rate Control under Reliability Constraints in Cognitive Radio Networks  

Nguyen, Hung Khanh (Department of Electronics and Radio Engineering, Kyung Hee University)
Song, Ju-Bin (Department of Electronics and Radio Engineering, Kyung Hee University)
Publication Information
Abstract
Resource allocation, such as joint rate control and scheduling, is an important issue in cognitive radio networks. However, it is difficult to jointly consider the rate control and scheduling problem due to the stochastic behavior of channel availability in cognitive radio networks. In this paper, we propose an asymmetric joint rate control and scheduling technique under reliability constraints in cognitive radio networks. The joint rate control and scheduling problem is formulated as a convex optimization problem and substantially decomposed into several sub-problems using a dual decomposition method. An algorithm for secondary users to locally update their rate that maximizes the utility of the overall system is also proposed. The results of simulations revealed that the proposed algorithm converges to a globally optimal solution.
Keywords
Cognitive Radio (CR); resource allocation; asymmetric joint rate control and scheduling; convex optimization; dual decomposition method;
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