Green Resource Allocation to Minimize Receiving Energy in OFDMA Cellular Systems
Advanced cellular systems supporting ultra high traffic (e.g., 1 Gbps) utilize aggressive communication technologies to User Equipment (UE) and thus induce high-energy consumption. To reduce UE energy consumption, the authors note that in OFDMA systems, transmissions to one UE can be scheduled into fewer time slots due to multiple available sub-carriers. It implies that the circuit energy of UEs can be reduced if turning off the circuits during the slots without receptions is allowed. A nonlinear integer resource optimization is thus formulated for base stations to minimize the receiving energy of UEs, with a proposed algorithm to reach optimal solution efficiently.