Reducing Power Consumption in LTE Data Scheduling with the Constraints of Channel Condition and QoS

Abstract

3GPP has developed the Discontinuous Reception (DRX) power saving mechanism, which periodically turns off the radio interface to reduce power consumption. However, packets cannot be received during the on period, as a result that the Quality of Services (QoS) may be violated. In addition, channel condition may be unstable during the transmission, so the optimal DRX parameters should also be dynamically adjusted. In this paper, we propose the Dynamic Scheduling with Extensible Allocation and Dispersed Offsets (DXD) scheme, which is composed of two algorithms, DRX parameter decision algorithm, to determine the DRX period by considering channel condition and QoS constraints, and DRX-aware scheduling algorithm, to determine whether to extend the on duration so that QoS would not be affected by DRX. Simulation results demonstrate that our DXD approach can reduce power consumption up to 96.9% compared to no DRX scheme and guarantee QoS as good as no DRX scheme.