Abstract: 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.

Key words: heterogeneous wireless networks, long term evolution (LTE), WiMAX, admission selection