Channel Quality Driven Discontinuous Reception (DRX) Model for Power
Saving in LTE System
Abstract
Long-Term Evolution (LTE), which is a standard for wireless
communication, has incorporated Discontinuous Reception (DRX), a
power-saving strategy having the primary purpose of enhancing
energy-saving at the user equipment (UE). Nevertheless, for the networks
that have varying channel quality, it is not possible all the time for
fixed DRX parameters to obtain the desired improvement. This research
introduces a new model based on CQI (Channel Quality Indicator) that
will reduce energy consumption by eliminating unnecessary wakeups of
UE’s and also achieve reduced latency. As the DRX mechanism saves UE’s
energy usually by increasing latency, a tradeoff is necessary between
these two performance factors. LTE networks can optimize DRX model
parameters for minimizing power consumption based on CQI reporting by
UEs and MCS (Modulation and Coding Scheme) assignments by eNodeB as
network channel quality is not equal. In this research, an adaptive DRX
model is developed, namely CQI DRX, that maintains a balance between
power saving and latency. The simulation process is carried out using
ns3, a discrete event network simulator. This research shows that energy
consumption can be decreased by approximately 13%, and latency can be
diminished by around 7% compared with static DRX.