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首页> 外文期刊>Information Theory, IEEE Transactions on >Energy-Efficient Transmission Scheduling With Strict Underflow Constraints
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Energy-Efficient Transmission Scheduling With Strict Underflow Constraints

机译：具有严格下溢约束的节能传输调度

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摘要

This paper considers a single source transmitting data to one or more receivers/users over a shared wireless channel. Due to random fading, the wireless channel conditions vary with time and from user to user. Each user has a buffer to store received packets before they are drained. At each time step, the source determines how much power to use for transmission to each user. The source's objective is to dynamically allocate power in a manner that minimizes total power consumption and packet holding costs, while satisfying strict buffer underflow constraints and a joint power constraint in each slot. The primary application motivating this problem is wireless media streaming. For this application, the buffer underflow constraints prevent the user buffers from emptying, so as to maintain playout quality. In the case of a single user, a state-dependent modified base-stock policy is shown to be optimal with linear power-rate curves, and a state-dependent finite generalized base-stock policy is shown to be optimal with piecewise-linear convex power-rate curves. When certain technical conditions are satisfied, efficient methods to compute the critical numbers that complete the characterizations of the optimal control laws in each of these cases are presented. The structure of the optimal policy for the case of two users is then analyzed.
机译：本文考虑了通过共享无线信道将数据传输到一个或多个接收器/用户的单个源。由于随机衰落，无线信道条件会随着时间的推移以及用户的不同而变化。每个用户都有一个缓冲区来存储接收到的数据包，然后将其耗尽。在每个时间步长，信号源都会确定要用于传输给每个用户的功率。信号源的目的是以一种最小化总功耗和数据包保持成本的方式动态分配功率，同时满足严格的缓冲区下溢约束和每个时隙中的联合功率约束。引发此问题的主要应用是无线媒体流。对于此应用程序，缓冲区下溢约束可防止用户缓冲区清空，以保持播出质量。在单用户的情况下，状态相关的修正基本库存策略显示为具有线性功率率曲线的最优状态，状态相关的有限广义基本库存策略显示为具有分段线性凸的最优状态功率率曲线。当满足某些技术条件时，将提供有效的方法来计算临界值，以完成每种情况下最佳控制律的表征。然后分析了两个用户的最优策略的结构。

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