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在移动环境下,因为短距离无线技术在传输能效和速率上高于长距离无线技术,所以多个移动终端通过无线基站下载共同感兴趣内容时,移动终端之间相互协同进行短距离收发内容比长距离直接接收内容会消耗更少的能量.提出一种具有能量感知的协同内容分发策略.根据无线技术的特点和移动终端的能耗特征,抽象出该策略的能耗优化模型,然后运用基于最小生成树的分布式算法对该模型求解.在NS-2仿真实验中,将本文提出的策略与能耗最小方案以及无协同方案进行比较,给出该策略在节能和能耗公平性的对比结果,结果表明该策略不仅能降低移动终端所消耗的总能量,而且兼顾各移动终端能量消耗的公平性.
In a mobile environment, because short-range wireless technologies are superior in energy transmission efficiency and speed to long-distance wireless technologies, when a plurality of mobile terminals download common content of interests through a wireless base station, the mobile terminals cooperate with each other for short-distance transceiving content ratio It will consume less energy when receiving content directly over long distances.An energy-aware collaborative content delivery strategy is proposed.According to the characteristics of wireless technology and the energy consumption characteristics of mobile terminals, the energy consumption optimization model of this strategy is abstracted, The minimum spanning tree algorithm is used to solve this model.In the NS-2 simulation experiment, the proposed strategy is compared with the minimum energy consumption scheme and the non-cooperation scheme, and the comparison between the energy saving and energy consumption fairness is given As a result, the results show that the strategy not only reduces the total energy consumed by the mobile terminal, but also takes into account the fairness of energy consumption of each mobile terminal.