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研究生:孫瑞祥
研究生(外文):Sun Jui-Hsiang
論文名稱:低暫存空間與等待時間之隨選視訊廣播架構應用於WiMAX系統中
論文名稱(外文):Low Buffering and Waiting-Time Video-on-Demand Broadcasting Scheme for WiMAX Systems
指導教授:陳仁暉
指導教授(外文):Chen Jenhui
學位類別:碩士
校院名稱:長庚大學
系所名稱:資訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:英文
論文頁數:35
中文關鍵詞:演算法廣播暫存空間隨選視訊等待時間無線網路WiMAX
外文關鍵詞:algorithmbroadcastingbufferVoDwaiting timewirelessWiMAX
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在下一代行動無線網路中例如全球互通微波存取 (worldwide interoperability for microwave access; WiMAX)而言,隨選視訊應用服務對於行動用戶而言是一項重要趨勢。許多多媒體服務在使用者開始觀看影片時,可能造成行動裝置需要使用大量的暫存空間與花費冗長的等待時間。為了改善這些缺點,許多機制紛紛被提出,例如反向式快速廣播架構 (reverse fast broadcasting; RFB)與切割式廣播架構(division-base broadcasting; DBB)分別在降低所需之暫存空間與縮短其等待時間。然而,考慮行動裝置上僅搭載有限的暫存空間,對於暫存空間與等待時間之要求必須更加縮減,使上述所論及之方法不適用於無線行動網路中。因此我們首先針對降低暫存空間提出一proactive架構,稱為餘數排列廣播架構 (remainder arrangement broadcasting; RAB)。再者,針對縮短等待時間方面,我們在原有RAB架構上加上reactive方法,稱為混合式餘數排列廣播架構 (hybrid RAB; HRAB)。根據模擬結果顯示RAB架構在不需要花費大量頻寬情形之下能使暫存空間降至10%以下,並且HRAB架構也大幅縮短等待時間。
Providing video-on-demand (VoD) services for mobile devices in next generation networks such as the worldwide interoperability for microwave access (WiMAX) is an important trend. These multimedia services may require mobile devices keeping a large buffer size for video playing and let mobile devices spend a lot of time for waiting the start of the requested video. To improve this drawback, many mech-
anisms such as reverse fast broadcasting (RFB) scheme and division- base broadcasting (DBB) scheme are proposed to overcome problems of lowering the buffer size and shortening the waiting time for video playing. However, the required buffer size and waiting time are still not acceptable for wireless environment due to the limited buffer size and mobility consideration of the mobile devices. Thus we first propose a proactive scheme named remainder arrangement broadcasting (RAB) to lower the required buffer size. Then, to shorten the start time of video playing, we add the reactive method to RAB scheme named hybrid RAB (HRAB). Simulation results show that RAB will achieve a lower buffer size, which is under 10%, without requiring large bandwidth and HRAB will shorten the waiting time well.
Abstract iii
Acknowledgements iv
List of Figures vi
1 Introduction 1
1.1 Background 1
1.1.1 Worldwide Interoperability for Microwave Access 1
1.1.2 Video-on-Demand 2
1.2 Motivation 3
2 Related Work 5
2.1 Reverse Fast Broadcasting Scheme 5
2.2 Division-Based Broadcasting Scheme 5
3 The System Model 7
4 Proposed Scheme 11
4.1 RAB Scheme 12
4.2 HRAB Scheme 14
5 The Numerical And Simulation Results 17
6 Conclusion 24
Bibliography 25
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[20] The video file comparison. http://www.videohelp.com/comparison.htm.
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