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Investigating the energy-efficiency/delay jitter trade off for VoLTE in LTE downlink

The term Energy Efficiency (EE) is turning out to be a radical characteristic for today's 4G networks — which provide energy-hungry wireless services — especially from the battery-limited devices' perspective. In addition to the EE, meeting firm levels for the quality-of-service (QoS) of those energy demanding applications is inevitable. In this paper we study the EE of the user equipment (UE) in the LTE downlink and the delay jitter as a fundamental QoS metric for various real-time applications. The study focuses mainly on the Voice over LTE (VoLTE) traffic as being a heavily used service. We provide a multiobjective optimization for both the EE and the delay jitter subject to fixed delay budget. To address the complexity of the proposed optimal scheduler, two different heuristic algorithms were developed. Numerical results demonstrate that our proposed schedulers achieve better trade-off for the EE versus the delay jitter compared to existing state-of-the-art schedulers.