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On Optimal Power Control for Delay-Constrained Communication Over Fading Channels

机译：衰落信道上时延受限通信的最优功率控制

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摘要

In this paper, the problem of optimal power control for delay-constrained communication over fading channels is studied. The objective is to find a power control law that optimizes the link layer performance, specifically, minimizes delay bound violation probability (or equivalently, the packet drop probability), subject to constraints on average power, arrival rate and delay bound. The transmission buffer size is assumed to be finite; hence, when the buffer is full, there will be packet drop. The fading channel under study has a continuous state, e.g., Rayleigh fading. Since directly solving the power control problem (which optimizes the link layer performance) is particularly challenging, the problem is decomposed into three subproblems and the three subproblems are solved iteratively; the resulting scheme is called joint queue length aware (JQLA) power control, which produces a local optimal solution to the three subproblems. It is proved that the solution that simultaneously solves the three subproblems is also an optimal solution to the optimal power control problem. Simulation results show that the JQLA scheme achieves superior performance over the time domain water filling and the truncated channel inversion power control.
机译：本文研究了衰落信道上时延受限通信的最优功率控制问题。目的是找到一种功率控制法则，该法则可优化链路层性能，尤其是在受到平均功率，到达速率和延迟限制的约束的情况下，使延迟限制违反概率（或等效地，丢包概率）最小化。假定传输缓冲区的大小是有限的。因此，当缓冲区已满时，将会有数据包丢失。研究中的衰落信道具有连续状态，例如瑞利衰落。由于直接解决功率控制问题（优化链路层性能）特别具有挑战性，因此将该问题分解为三个子问题，并迭代地解决了这三个子问题。所得的方案称为联合队列长度感知（JQLA）功率控制，它针对三个子问题产生局部最优解。事实证明，同时解决这三个子问题的解决方案也是最优功率控制问题的最优解决方案。仿真结果表明，JQLA方案在时域注水和截断通道反演功率控制方面具有优异的性能。

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