蔡志宏Tsai, Zse-hong臺灣大學:電信工程學研究所鄭舜隆Cheng, Shun-LungShun-LungCheng2010-07-012018-07-052010-07-012018-07-052009U0001-2905200810415700http://ntur.lib.ntu.edu.tw//handle/246246/188355While 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. e 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.中文摘要 IBSTRACT II錄 III目錄 V目錄 VI一章 緒論 1.1 研究動機與背景介紹 1.2 相關研究 2.3 問題描述 4.3.1 使用者類型之研究 4.3.2 頻段分配之研究 6.4 研究目標 10.5 論文章節架構 11二章 系統架構與演算法 13.1 系統架構 13.2 劃分頻道保留與handoff rate之研究 17.3 效用函數介紹 19.4 壅塞預測及強制中斷時間點之綜合分析研究 21.4.1 壅塞預測分析研究 21.4.2 使用時間分析 25.5 策略二與策略三的比較 27.6 集縮比與超賣頻寬之探討 29三章 模擬結果與效能分析 31.1 模擬參數設計 31.2 固定集縮比之下，檢驗不同使用者之最佳分配策略 34.2.1 時段間交通量變化性大 34.2.2 時段間交通量變化性小 40.3 達到滿意度前提下，決定集縮比的大小 47.3.1 在容忍的中斷機率範圍下，調整不等式最低下限的情形 48.3.2 固定不等式最低下限的情形下，變動容忍被中斷的機率 50.4 檢視不同使用者族群比例對頻譜使用率的影響 52四章 結論與未來研究方向 57.1 結論 57.2 未來研究方向 58考文獻 591523659 bytesapplication/pdfen-US動態頻譜分配集縮比壅塞允入控制Dynamic Spectrum AllocationhandoffHSDPAconcentration rateadmission controlthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/188355/1/ntu-98-R96942116-1.pdf