Yangyang Liu（刘扬扬）5120309665.PPT

Yangyang Liu(刘扬扬) 5120309665 点击添加文本 点击添加文本 点击添加文本 点击添加文本 Brief Introduction of VOD 1 VOD With Different Popularity 2 VOD With Cache 3 Reference Paper 4 点击添加文本 点击添加文本 点击添加文本 点击添加文本 System Allow users to select and watch/listen to video content when they choose to Provide subscribers with the possibility of watching the video of their choice at the time of their choice 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 S, the total length(in time units)of the video , the ith segment w, the client waiting time requirement , the bandwidth used to transmit the ith segment n, the number of segments for a given video 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 Solution: 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 点击添加文本 Theorem : Given and , If is an integer, then the minimum access delay can be provided is Parameters D Duration of the video C Num. of intervals/packets for CBR video Ratio of redundant time intervals Rated system transmission reliability K Num. of slots in a time interval N Num. of subchannels 点击添加文本 点击添加文本 点击添加文本 点击添加文本 Describe the degree that how popular the video is. The probability that a media video is requested by the customers at a certain moment. The popularity-based data allocation within a cluster will have a real impact on data retrievals due to the greatly localized data allocation. 点击添加文本 点击添加文本 点击添加文本 点击添加文本 1 sever, M videos Popularity matrix , each video has a popularity(stands for the request probability) Each occupies N subchannels(fixed). Use CBR broadcasting scheme B is the total bandwidth, and is the bandwidth allocated for each video is the duration of each video a is ration of redundant time intervals 点击添加文本 点击添加文本 点击添加文本 点击添加文本 Parameters Bi Bandwidth for each video N Constant, number of channels for e