A OpenFlow-based Vehicular Mobile Content Delivery Network

• Main Authors: Tsai, Shih-Jen, 蔡世仁
• Other Authors: Chen, Chien
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/17226503031496295074

碩士 === 國立交通大學 === 網路工程研究所 === 103 === In this thesis, we propose a Software-Defined Network (SDN) architecture to sup-port a vehicular mobile Content Delivery Network (CDN). Traditional CDN needs to pay the cost of huge content data location, nodes’ bandwidth and network topology collection and analyzing to find a surrogate server closer to user. In a vehicular mobile CDN, it even more difficult to find a closer surrogate server, since most users are travelling in high speed. In our SDN mobile CDN architecture, we assume each Road-Side Unit （RSU）combines with a SDN switch and a content server. The SDN controller will collect the street videos’ metadata which is stored on a RSU using the vendor specific message of OpenFlow protocol, thereby identifying the server which has video content which a user needs. In order to support the mobile user, multiple surrogate servers (RSUs) on the target vehicle travelling path need to be de-termined by the SDN controller. Then a pre-cache mechanism implemented in the controller will decide video segment size and cache the video on each surrogate RSU. Finally the SDN controller will install a dynamic routing rule in each surrogate RSU’s flow table to redirect a HTTP request to the surrogate server.. In addition, we employ an popular Http Live Streaming (HLS) technology to deliver the video. In this thesis, we use the OpenNet simulator which unites mininet and ns-3 wireless module to ana-lyze our system’s performance. The performance metrics include Peak Signal to Noise Ratio (PSNR), Start Up Delay, and Playout Continue Index（PCI）. The simulation results show that our SDN based vehicular mobile CDN can increase about 33% PSNR in average.