无线网络中文件缓存命中率和能耗的联合优化

Joint optimization of cache hit ratio and energy consumption in wireless network

任何一个缓存问题的重要目标都是减少网络中的流量,但在内容中心网络中能量的消耗是一个不得不考虑的因素,包含缓存能量消耗和传输能量消耗。提出了传统的缓存效率衡量指标,例如命中率,和能量消耗之间存在一定的对立关系。提出一种既可以提高命中率又考虑到减少能量消耗的新的缓存机制,并将这个优化问题表达成亚模的形式,通过贪心算法找到命中率和能量消耗的平衡点,并且找到一种近似最优的缓存机制。最后通过仿真验证了这一结果,在内容中心网络中可以达到命中率和能量消耗的一个均衡的缓存机制。

An important goal of any caching problem is to reduce traffic in the network, but the energy consumption in the content centeric network is a factor that needed to be considered, including cache energy consumption and transmission energy consumption. This paper presents a traditional relationship between the cache efficiency measures, such as hit rate, and energy consumption. This paper presents a new caching mechanism that can improve the hit rate and also reduce the energy consumption. Besides this paper express this optimization problem in the form of submodular, find the balance of the hit rate and energy consumption through the greedy algorithm, and find a kind of approximate optimal cache mechanism. Finally, the simulation results show that this result can achieve a balanced cache mechanism of hit rate and energy consumption in the content center network.