Abstract：Energy-efficient resource allocation issue in uplink OFDMA systems is investigated. Firstly, the uplink OFDMA system is modeled as a M/G/1 queuing system with the consideration of the packet retransmission and the serve rate of the system is determined by both the resource allocation result and the current channel condition. With the constraint of average delay of traffic, an optimization model for energy-efficient resource allocation is formulated based on the traffic statistical information. Since the optimization problem is NP-hard, a heuristic algorithm is proposed which allocates the resource by two steps: the number of suchannels determines, and allocates the subchannels to each user. Simulation results show that, the proposed algorithm can improve the system energy efficiency effectively while guaranteeing the average delay requirement of the traffic.
2013, Vol. 35 
