Sensitivity of energy-aware radio link control to imperfect average path loss knowledge

J. Nsenga, B. Bougard, G. Lenoir, A. Dejonghe, F. Catthoor
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Abstract

The need for higher data rates in wireless system has driven most of the recent wireless research arena. However, the increase of the system transmission rate implies higher system energy consumption. This creates a serious problem in the case of battery-powered devices such as wireless terminals. Therefore, a power management policy is necessary to dynamically trade off the system transmission rate and its energy consumption. In previous work, cross-layer energy-aware radio link control has been applied on OFDM-based WLAN transceivers. Such systems are designed for operating in indoor environment, where they can provide high throughput under low mobility conditions. Thus, the cross-layer energy-aware radio link control relies on a constant average path loss. However, in a wireless indoor environment, the average path loss can encounter significant random changes if, for instance, unpredictable object appears suddenly between the transmitter and the receiver, or simply if one or both terminal moves. The average path loss variation can reach up to 40 dB in some cases. Consequently, the power management stability can be dramatically affected. This paper aims at analyzing the sensitivity of the cross-layer energy radio link control due to such real-time average path loss variation. We also propose a more robust approach to ensure the stability of the considered radio link control strategy against random average path loss changes. From the simulation results, we have proven that the proposed radio link control approach can reduce the relative sub-optimal energy consumption per bit down to 5% compared with perfect calibration, which implies a factor 6 reduction in the sub-optimal energy consumed per bit regarding the existing radio link control.
能量感知无线电链路控制对不完全平均路径损耗知识的灵敏度
无线系统对更高数据速率的需求推动了近年来无线研究领域的发展。但是,系统传输速率的提高意味着系统能耗的增加。这在电池供电的设备(如无线终端)中造成了一个严重的问题。因此,需要一个电源管理策略来动态地权衡系统的传输速率和能耗。在以往的工作中,跨层能量感知无线链路控制已经应用于基于ofdm的WLAN收发器。此类系统设计用于在室内环境中运行,在室内环境中,它们可以在低流动性条件下提供高吞吐量。因此,跨层能量感知无线电链路控制依赖于一个恒定的平均路径损耗。然而,在无线室内环境中,如果发射器和接收器之间突然出现不可预测的物体,或者仅仅是一个或两个终端移动,平均路径损耗可能会遇到显著的随机变化。在某些情况下,平均路径损耗变化可达40 dB。因此,电源管理的稳定性会受到极大的影响。本文旨在分析这种实时平均路径损耗变化对跨层能量无线电链路控制灵敏度的影响。我们还提出了一种更鲁棒的方法来确保所考虑的无线电链路控制策略对随机平均路径损耗变化的稳定性。从仿真结果中,我们已经证明,与完美校准相比,所提出的无线电链路控制方法可以将每比特的相对次优能量消耗降低到5%,这意味着与现有的无线电链路控制相比,每比特的次优能量消耗降低了6倍。
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