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The authors study the profit maximization problem of a cognitive virtual network operator in a dynamic network environment. They consider a downlink OFDM communication system with various network dynamics, including dynamic user demands, uncertain sensing spectrum resources, dynamic spectrum prices, and time-varying channel conditions. In addition, heterogeneous users and imperfect sensing technology are incorporated to make the network model more realistic. By exploring the special structural of the problem, they develop a low-complexity on-line control policy that determine pricing and resource scheduling without knowing the statistics of dynamic network parameters. They show that the proposed algorithms can achieve arbitrarily close to the optimal profit with a proper trade-off with the queuing delay.
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