802.11协议标准下，高效的能量效率与传输功率控制研究

802.11协议标准下，高效的能量效率与传输功率控制研究(中文10000字,英文8000字)
摘要
802.11无线局域网中的速率适配和传输功率控制得到了研究界的广泛关注，大多数的建议都是基于网络条件来最大化吞吐量。考虑到能源消耗，一个隐含的假设是能量吞吐量效率的最优性，但这一假设最近受到了质疑。本文通过分析、仿真和实验，研究了多速率802.11环境下吞吐量性能与能量效率之间的关系。我们证明了这些性能指标之间的权衡，并说明它们可能不能同时被优化，并分析了它们对器件能耗参数的敏感性。本文利用传输功率控制算法分析了现有速率自适应算法的这种折衷，并讨论了如何在考虑能量消耗的情况下设计新的方案。

On the energy e ciency of rate and transmission power control in 802.11
Rate adaptation and transmission power control in 802.11 WLANs have received a lot of attention from the research community, with most of the proposals aiming at maximising throughput based on network conditions. Considering energy consumption, an implicit assumption is that optimality in throughput im-plies optimality in energy e ciency, but this assumption has been recently put into question. In this paper, we address via analysis, simulation and experimentation the relation between throughput perfor-mance and energy e ciency in multi-rate 802.11 scenarios. We demonstrate the trade-off between these performance figures, confirming that they may not be simultaneously optimised, and analyse their sen-sitivity towards the energy consumption parameters of the device. We analyse this trade-off in existing rate adaptation with transmission power control algorithms, and discuss how to design novel schemes taking energy consumption into account.