Energy Conservation and Interference Mitigation: From Decoupling Property to Win-Win Strategy

摘要

This paper studies the problem of conserving the energy Of mobile terminals in a multi-cell TDMA networks supporting bursty real-time sessions. The associated optimization problem involves joint scheduling, rate control, and power control. To tackle the complexity, we propose a decomposition method that decouples the overall problem into two sub-problems: intra-cell energy optimization and inter-cell interference control. This decomposition results in a "win-win" situation: it reduces the energy consumptions and inter-cell interference at the same time. Simulations show that our decomposition method can achieve an energy reduction of more than 70percent compared to the simplistic maximum transmit power policy. It can achieve an energy reduction of more than 50percent compared to the case where only intra-cell energy optimal transmission is performed. We also derive an interesting decoupling property assuming that the interference power stays constant over a TDMA frame: if the idle power consumption of mobile terminals is no less than their circuit power consumption during transmission, or when both are negligible, then the energy-optimal transmission rates of the mobile terminals are independent of the inter-cell interference power level.