An Energy Efficient Semi-static Power Control and Link Adaptation Scheme in UMTS HSDPA

TL;DR

This paper proposes a novel semi-static power control and link adaptation scheme for HSDPA that significantly improves energy efficiency by optimally selecting MCS levels and transmit power, extended to MIMO scenarios.

Contribution

It introduces a new energy-efficient power control and link adaptation scheme with a dual trigger mechanism for HSDPA, extended to MIMO, reducing energy consumption and signaling overhead.

Findings

Significant energy efficiency improvement demonstrated in simulations

Dual trigger mechanism reduces signaling overhead

Potential gains and challenges discussed for mode switching between SIMO and MIMO

Abstract

High speed downlink packet access (HSDPA) has been successfully applied in commercial systems and improves user experience significantly. However, it incurs substantial energy consumption. In this paper, we address this issue by proposing a novel energy efficient semi-static power control and link adaptation scheme in HSDPA. Through estimating the EE under different modulation and coding schemes (MCSs) and corresponding transmit power, the proposed scheme can determine the most energy efficient MCS level and transmit power at the Node B. And then the Node B configure the optimal MCS level and transmit power. In order to decrease the signaling overhead caused by the configuration, a dual trigger mechanism is employed. After that, we extend the proposed scheme to the multiple input multiple output (MIMO) scenarios. Simulation results confirm the significant EE improvement of our proposed scheme. Finally, we give a discussion on the potential EE gain and challenge of the energy efficient mode switching between single input multiple output (SIMO) and MIMO configuration in HSDPA.