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arXiv 0908.0587cs.NI
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衰落无线信道中异构实时的业务的调度

Scheduling Heterogeneous Real-Time Traffic over Fading Wireless Channels

I-Hong Hou, P. R. Kumar

摘要:

我们开发了一种通用的方法来设计调度策略的实时的【形】流量在无线信道上。我们扩展以前的工作,其特点是实时的【形】流的流量模式,延迟范围,及时的吞吐量要求,和信道的可靠性,允许时变信道,允许客户端有不同的最后期限,并允许可选的就业率自适应。因此,我们的模型允许治疗更现实的衰落信道以及移动节点的情况下,和使用更一般的传输策略。我们得到了调度策略可行最优的充分条件,从而建立了一类可行最优策略。我们证明了所确定的类的效用,推导出一个可行性的最优策略的情况下,与速率自适应,时变信道,和异构的延迟界限。当速率自适应不可用时,我们也得到了一个可行的时变信道的最优策略。对于速率自适应不可用,但客户端有不同的延迟范围的情况下,我们描述了一个启发式。仿真结果也表明更现实和复杂的情况下的调度策略的实用性。

英文摘要:

We develop a general approach for designing scheduling policies for real-time traffic over wireless channels. We extend prior work, which characterizes a real-time flow by its traffic pattern, delay bound, timely-throughput requirement, and channel reliability, to allow time-varying channels, allow clients to have different deadlines, and allow for the optional employment of rate adaptation. Thus, our model allow the treatment of more realistic fading channels as well as scenarios with mobile nodes, and the usage of more general transmission strategies. We derive a sufficient condition for a scheduling policy to be feasibility optimal, and thereby establish a class of feasibility optimal policies. We demonstrate the utility of the identified class by deriving a feasibility optimal policy for the scenario with rate adaptation, time-varying channels, and heterogeneous delay bounds. When rate adaptation is not available, we also derive a feasibility optimal policy for time-varying channels. For the scenario where rate adaptation is not available but clients have different delay bounds, we describe a heuristic. Simulation results are also presented which indicate the usefulness of the scheduling policies for more realistic and complex scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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