Abstract-In this paper, we study the problem of optimal power control for delay-constrained communication over fading channels. Our 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 our 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, we decompose it into three subproblems, and solve the three sub-problems iteratively; we call the resulting scheme Joint Queue Length Aware (JQLA) power control, which produces a local optimal solution to the three subproblems. We prove that the solution that simultaneously solves the three sub-problems 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. E.g., JQLA achieves 10 dB gain at packet drop probability of 10 −3 , over the time domain water filling power control.Index Terms-Delay-constrained communication, power control, queuing analysis, delay bound violation probability, packet drop probability.
In this paper, we study efficient power control schemes for delay sensitive communication over fading channels. Our objective is to find a power control law that optimizes the link layer performance, specifically, minimizes the packet drop probability, subject to a long-term average power constraint.We assume the buffer at the transmitter is finite; hence packet drop happens when the buffer is full.The fading channel under our study has a continuous state, e.g., Rayleigh fading. Since the channel state space is continuous, dynamic programming is not applicable for power control. In this paper, we propose a sub-optimal power control law based on a parametric approach. The proposed power control scheme tries to minimize the packet drop probability by considering the queue length, i.e., reducing the probability of those queue-length states that will cause full buffer. Simulation results show that our proposed power control scheme reduces the packet drop probability by one or two orders of magnitude, compared to the time domain water filling and the truncated channel inversion power control.
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