The paper considers a new method of the Quality of Service (QoS) assurance in opportunistic access to wireless networks using a game theoretic-framework. The perfect full information of the involved links is made known to the central management unit called spectrum broker. Three algorithms of spectrum sharing are proposed. In each algorithm, Cournot oligopoly competition or monopolistic behaviour of the players are considered, and adjustment to the actual available spectrum bandwidth is done to make an efficient use of all available spectrum resources. For the QoS support, spectrum demands are categorized in four traffic classes with special parameters which represent priority classes, the target bit error probability (BEP) and the volume of user demands. The proposed resource sharing algorithms may be used in opportunistic or cognitive wireless networks, and are characterized by low computational complexity.
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