针对异构网络环境中的接入网选择问题,使用李雅普诺夫优化理论对网络进行建模,并提出了使不同接入网络的剩余服务时间差异最小的选择算法。该算法在保证网络稳定的基础上,在长时间尺度内降低了网络的阻塞率。仿真表明,该算法可以提高网络的利用率,降低用户被拒绝的概率。
Due to the problem of how to select the most suitable access network for users at any time anywhere in het- erogeneous wireless networks(HWN), a distributed algorithm to minimize the difference of residual service time between different access networks was proposed. The algorithm use the Lyapunov optimization to model the network and guaran- tee the stability of the network. Simulation results show that the proposed algorithm can decrease the rejection ratio and achieve a shorter queue length in access networks.