Abstract: Aiming at solving the problem of selecting appropriate network for mobile users in wireless heterogeneous access network, an optimal model of network selection was proposed based on each access network's available bandwidth and delay parameter. Network selection was formulated as dynamic programming problem in multi-homing environment, and an algorithm of selecting access network based on dynamic programming was presented. Simulation results show that the proposed algorithm provides optimal utilization of network resource and meets users' requirements.

Key words: network selection, bandwidth allocation, heterogeneous access network, dynamic programming, multi-homing

摘要： 针对异构接入网络环境中移动用户的网络选择问题，根据接入网络的可用带宽和时延参数，建立网络选择优化模型，将多链路接入网络环境中的网络选择问题利用动态规划公式进行描述，并提出一个基于动态规划的网络选择算法。模拟结果表明，提出的算法能有效地利用网络资源并更好地满足用户业务需求。

关键词: 网络选择, 带宽分配, 异构接入网络, 动态规划, 多链路