在兩種無線網路間動態頻道分配下之效能分析

Abstract

While the internet and digital transmission are developed, the demand of high transmission rate, file sharing or video on demand have been increasing rapidly. However, the spectrum resource of a popular band is often limited. If users’ requests are not served, the dissatisfied and blocking probability are increasing. We have thus proposed an architecture for multiple networks to allocating the spectrum dynamically. When traffic loads is high and the congestion phenomenon occurs, dynamic channel allocation can improve the higher probability of blocking and promote the whole system utilization. In the thesis, we assume four user types to communicate adopting two spectrums in seven cells. Besides, channel borrowing scheme is also taking account of. We propose three channel allocation policies: (1) Radio resource with admission control. (2) Reallocation on hourly basis. (3) Reallocation on non-hourly basis. In the thesis, we will analyze the performance of these policies with simulation and find the best allocation policy under blocking probability and utility. Last but not least, we could decide the appropriate concentration rate through the best policy to give consideration to quality of service and profit.