打印绿色通信研究-Femtocell网络能效建模.pdfVIP

摘 要 可靠性和生存性是无线网络的两个重要特性。特别是随着众多新兴无线网 络和移动数据业务需求的快速增长、用户数目的急剧增加以及无线宽带业务的 与日俱增，有限的无线网络资源能否满足更多人的需求成了迫切需要关注的问 题。因此，通信链路的传输成功率和网络的通话阻塞率等成为研究中的重要指 标。同时，随着全球气候变暖的不断加剧和材料能源的日益稀缺，人们也提出 了绿色通信的概念，网络能量效率成为人们关注的焦点之一。 为了应对上述问题，有必要对无线网络的传输及资源分配进行数学建模， 以分析网络可靠性等参数；另一方面，在此基础上，我们可以对网络的能量效 率建模，以此作为衡量网络性能的重要指标。 本文考虑在 femtocell 场景下，对网络信道资源分配进行研究，建立不同 状态的马尔科夫链，然后在考虑信道存在路径衰落和阴影效应的情况下，对信 道状况进行建模，推导出 femtocell 上行链路的信道信干比的概率密度函数 （pdf ），进而计算出系统的中断概率。此外，本文还考虑对femtocell 网络能量 效率进行数学建模，引入能量消耗比来表征该性能指标，并分别仿真分析。 关键词：马尔科夫链；femtocell 网络；路径衰落；阴影效应；能量效率 I Abstract Reliability and survivability are two important characteristics of wireless networks. Especially, there is increasing concern about whether limited resources in wireless networks can meet user’s requirement with growing data services demand, increasing number of users and growing wireless broadband services in emerging wireless and mobile networks. Therefore, the transmission success probability of wireless links and the call blocking probability have become important metrics in wireless network study. Meanwhile, with increasing global warming and the increasing scarcity of energy sources, people also raise the concept of green communications, in which the network energy efficiency has been become a hot point. To address these problems, mathematical modeling of the transmission process and the resource allocation in wireless networks is necessary so as to analyze network reliability and other features; on the other hand, the network energy efficiency can be modeled as an important indicator in evaluating netw