异构网中一种能效最优的垂直切换算法

针对传统垂直切换算法中未能考虑能效这一关键因素，提出了一种能效最优的垂直切换算法，算法核心是移动终端检测并计算来至不同候选网络中的接收信号强度以及各候选小区中的系统容量，以候选小区中每单位能量所能提供的容量作为判决准则切入到最佳网络，同时结合传统的网络因子对多属性判决算法进行能效扩展。仿真结果表明，基于单位能量容量的切换算法较传统的切换算法节省10%左右的能量，扩展的多属性判决算法较传统的切换算法节省7%左右的能量，同时减少了“乒乓效应”，提高了用户的通信体验质量。

A vertical handoff algorithm with optimal energy efficiency for heterogeneous networks

In view of the problem that traditional vertical handoff fails to take a crucial factor,energy effi-ciency,into consideration, an optimal energy efficiency vertical handoff algorithm is proposed. The algo-rithm's core is that the mobile terminal tests and calculates the intensity of different received signals from different candidate networks,and system capacity of different candidate areas. Capacity provided by the en-ergy of each unit in candidate areas is taken as decision criterion to realize handoff to the optimal network. Meanwhile,traditional network factors are combined to perform energy efficiency expansion on the multiple attributes decision algorithm. Simulation results show that the handoff algorithm based on unit energy ca-pacity saves about 10% energy when compared with the traditional one,while the expanded multiple attrib-utes decision algorithm saves about 7% energy. Meanwhile,“ping pang effect” is reduced,thereby impro-ving users'communication experience quality.