提出了一种能有效均衡异构无线网络负载的动态接入选择算法，在考虑用户移动性、通话质量满意度以及网络当前剩余资源的基础上，进一步考虑网络负载的动态变化趋势. 通过预测不同可接入网络对整个系统阻塞率的影响，实时调节网络负载使其趋于理想状态. 仿真结果表明，该算法能动态适应网络负载变化，有效减小候选网络之间的阻塞率差距，从而降低整个异构系统的平均阻塞率.

 A dynamic access selection algorithm based on load balance is proposed for heterogeneous wireless networks. To adjust the network load to reach an ideal state, the algorithm not only considers user mobility, user satisfaction and available bandwidth of each network, but also considers the influences of selecting different access networks on the overall call blocking probabilities. Simulation results show that the proposed algorithm can dynamically adapt to the network load and lessen the unbalance of call blocking probabilities among candidate networks, and thus effectively reduces the average call blocking probability of the whole heterogeneous system.