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The authors investigate downlink resource allocation for OFDM-based cognitive radio networks. It is assumed that secondary users are allowed to transmit on all subchannels as long as the interference they create for primary users is properly controlled to be below a critical threshold. In addition, they consider a practical setting where secondary users have finite queue backlogs and a total power constraint at the base station and they perform resource allocation either over one or multiple time slots. Specifically, secondary users with small queue backlogs are only allocated sufficient rates to support their traffic demands and the remaining radio resources are shared among highly backlogged users. Under this setting, they formulate the joint subchannel and power problem with max-min fairness for highly backlogged users.
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