為了讓能源有效使用，在這篇論文中，我們將針對IEEE 802.16e無線都會網路提出一個多播省電排程機制。在此我們想要解決的問題是：base station該在哪些frames傳送哪些多播資料，才能讓mobile stations在最少的frames總數裡頭接收完所需要的資料。我們首先證明這個是一個NP-complete的問題，接著提出一個貪婪近似演算法，稱之為G-EEMS，可以在時間 解決此一問題，並保證醒來的frames總數不會超過最佳解的k倍，其中n為排程資料的總數，k為MBS (multicast and broadcast service) zone所能容納的資料數目。實驗結果顯示，就energy throughput來看，G-EEMS明顯地優於文獻已知的多播省電機制SMBC-D。

In this thesis, we proposed a simple yet novel multicast scheduling scheme for IEEE 802.16e wireless metropolitan area networks. Specifically, we want to solve the problem that how the base station schedules data messages in a multicast superframe such that mobile stations can receive their required multicast data and the total awake time of mobile stations is minimal. We first prove that this problem is NP-complete, and then propose a greedy k-approximation algorithm, named G-EEMS, whose running time is , where n is the total number of multicast data messages and k is the size of MBS (multicast and broadcast service) zone in a frame. Simulation results show that, in terms of energy throughput, G-EEMS significantly outperforms the existing scheme, called SMBC-D.

封面 i
中文學位論文審定書 ii
英文學位論文審定書 iii
中文摘要 iv
英文摘要 iv
誌謝 v
目錄 vi
圖目錄 viii
表目錄 x
第一章 緒論 1
1.1 微波存取全球互通 (WiMAX) 1
1.2 PMP網路架構 1
1.3 多播服務 (Multicast Services) 2
1.4 電源管理 3
1.5 論文貢獻 5
1.6 論文架構 6
第二章 相關文獻 7
2.1 Multicast Superframe 7
2.2 Logical Broadcast Channel 8
2.3 SMBC-D 9
第三章 高效能多播排程 18
3.1 以frame為基礎的省電機制 18
3.2 NP-Complete證明 18
3.3 貪婪近似演算法 23
3.3.1 貪婪演算法 23
3.3.2 近似比率 (Approximation Ratio) 28
3.3.3 彈性調控之貪婪近似演算法 30
第四章 模擬實驗 32
第五章 結論及未來方向 48
參考文獻 49

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