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arXiv cs/0601098cs.ITmath.IT
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无线网络中的能量效率和延迟服务质量

Energy Efficiency and Delay Quality-of-Service in Wireless Networks

Farhad Meshkati, H. Vincent Poor, Stuart C. Schwartz, Radu V. Balan

摘要:

利用博弈论框架研究了无线网络中的能量-时延权衡问题。一个多类多址接入网络中,用户选择他们的发射功率,并可能传输速率,在分布式的方式,以最大限度地提高自己的效用,同时满足他们的延迟服务质量(QoS)的要求。这里考虑的效用函数测量每焦耳能量消耗传输的可靠比特数,对于能量受限的网络特别有用。给出了该非合作博弈的纳什均衡解,并得到了均衡时用户效用的封闭表达式。在此基础上,由于存在延迟敏感的用户的能量效率和网络容量的损失进行了量化。分析扩展到的情况下,QoS要求包括平均源速率和平均总延迟(包括排队延迟)的约束。它示出的传入的业务速率和用户的延迟约束转化为用户的“大小”,这是由用户消耗的资源量的指示。使用这个框架,吞吐量,延迟,网络容量和能源效率之间的权衡也被量化。

英文摘要:

The energy-delay tradeoffs in wireless networks are studied using a game-theoretic framework. A multi-class multiple-access network is considered in which users choose their transmit powers, and possibly transmission rates, in a distributed manner to maximize their own utilities while satisfying their delay quality-of-service (QoS) requirements. The utility function considered here measures the number of reliable bits transmitted per Joule of energy consumed and is particularly useful for energy-constrained networks. The Nash equilibrium solution for the proposed non-cooperative game is presented and closed-form expressions for the users' utilities at equilibrium are obtained. Based on this, the losses in energy efficiency and network capacity due to presence of delay-sensitive users are quantified. The analysis is extended to the scenario where the QoS requirements include both the average source rate and a bound on the average total delay (including queuing delay). It is shown that the incoming traffic rate and the delay constraint of a user translate into a "size" for the user, which is an indication of the amount of resources consumed by the user. Using this framework, the tradeoffs among throughput, delay, network capacity and energy efficiency are also quantified.

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