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Title: | 車用網路中以速度為基礎之串流服務之允入控制 Speed-based Admission Control for Streaming Service in Vehicular Networks |
Authors: | Chih-Lei Chang 張志蕾 |
Advisor: | 廖婉君 |
Keyword: | 串流服務,車用網路,允入控制,以速度為基礎, streaming,vehicular network,admission control,speed-based, |
Publication Year : | 2008 |
Degree: | 碩士 |
Abstract: | 在車用網路的架構下,車輛可以經由固定於路邊的路邊連線裝置連上網際網路。但由於成本的考量,路邊連線裝置通常無法太密集設置,因此覆蓋率偏低,僅能提供間歇性的連線。在這種架構下,使用者若欲經由路邊連線裝置連上網際網路並使用串流服務(如觀賞線上新聞轉播),如何讓使用者能擁有不中斷的服務便成為一項重要的工作。然而,由於車輛高度移動的特性,且使用者在使用串流服務時須經過多個路邊連線裝置,更增加了此項工作的困難度。
在這篇論文中,我們提出了一個機制,每當車輛經過路邊連線裝置時,路邊連線裝置便會執行基於速度考量的允入控制,以避免因為有過多的串流使用者的加入而導致對原有的使用者中斷服務或是使服務品質下降。我們藉由模擬來驗證這個機制的效果。由模擬結果可看出,我們的機制確實能夠降低串流服務被中斷的機率,同時我們也指出系統使用率與中斷率兩者間存在著取捨的關係,並且討論車輛密度對此機制效果的影響。 In vehicular networks, roadside units are often placed along the road every fixed interval for Internet access. But due to the limitation of sparse deployment of roadside units, vehicles can only connect to roadside units intermittently. For soft real-time streaming services over this architecture, how to provide persistent quality of service across multiple roadside units is an important task. However, the inherent mobility characteristics of vehicles have made this work more complicated. In this thesis, we propose a mechanism using periodic speed-based admission control in roadside units for resource reservation and avoidance of frequent service interruption resulting from high dynamics of vehicles. We evaluate the performance of our mechanism via simulation and show that interruption rate is decreased by using our mechanism. We also discuss the effect of vehicle density to our mechanism, as well as tradeoff between interruption rate and system utilization. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40880 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 資訊網路與多媒體研究所 |
Files in This Item:
File | Size | Format | |
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ntu-97-1.pdf Restricted Access | 394.83 kB | Adobe PDF |
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