针对全IP业务，该文针对LTE/WiMAX异构无线网络提出一种改进的基于可变传输单元的接入选择算法. 算法利用二维资源单元计算系统容量，通过引入负载转移和可变传输单元，合理分配系统资源，更有效地为全IP业务服务. 利用排队理论建立系统四维马尔柯夫排队模型，分析并评价了系统性能. 仿真结果表明，与原有接
入选择算法相比，该算法更符合网络实际情况，在保证异构无线网络实时业务性能基础上，有效提高了非实时业务性能及系统总资源利用率.

Abstract: For all IP services, we propose an improved alterable transmission units-based admission selection algorithm in LTE/WiMAX integrated heterogeneous wireless networks. The algorithm uses two-dimensional resource units to calculate system capacity. By introducing load transfer and alterable transmission units,system resources are distributed more reasonably, making the system more effective in serving all IP business.
The algorithm uses the queuing theory to establish a four-dimensional Markov queuing model, and analyze and evaluate the system performance. Simulation results show that, compared with the original admission selection algorithm, the proposed algorithm suits actual networks better, and can significantly reduce blocking rate of non-realtime services and increase the overall resource utilization of the system without affecting the realtime service performance.