Green Resource Allocation to Minimize Receiving Energy in OFDMA Cellular Systems
Journal
IEEE Communications Letters
Journal Volume
16
Journal Issue
3
Pages
372-374
Date Issued
2012-03
Author(s)
Abstract
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, we 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. Numerical results demonstrate that our computationally efficient algorithm can easily reduce more than 60% UE energy consumption, and thus is ready for practical systems such as 3GPP LTE/LTE-Advanced. © 2012 IEEE.
Subjects
Energy efficiency; Green; Resource scheduling
SDGs
Other Subjects
Cellular telephone systems; Energy utilization; Frequency division multiple access; Integer programming; Mobile telecommunication systems; Orthogonal frequency division multiplexing; Resource allocation; Wireless telecommunication systems; Communication technologies; Computationally efficient; Green; High energy consumption; Optimal solutions; Practical systems; Resource optimization; Resource-scheduling; Energy efficiency
Type
journal article