Video-on-demand (VoD) service has become the important service in Internet Protocol Television (IPTV) based on Content-delivery-network (CDN). There has been a large amount of media in recently years. Combined with growing users, how to quickly address the video requests from users with low delay is important for industry. In other words, to allocate resource (i.e. media) appropriately according to different situations is critical. This paper proposes strategies which make video replica and put it nearby users (set-up boxes) previously. The proposed strategies not only consider the popularity of the media but also consider its hot time, i.e. the time slots which most of the users access it. The experiment result shows that with the proposed strategies, user requests can be quickly addressed and the overall network traffic load can be reduced.

One way to broadcast a popular/hot video is to let multiple users share a few channels. The stress on the scarce channels can be alleviated without sacrificing viewer waiting time. One common approach is to partition the video into fixed-length segments, which are broadcast on several channels periodically. Two representative approaches are the fast broadcasting scheme and the PAGODA scheme, which can broadcast a video using k channels by having new viewers wait no longer than /spl Theta/(D/2/sup k/) and /spl Theta/(D/5/sup k/2/) time, respectively, where D is the length of the video. In this paper, we propose a new scheme, called recursive frequency splitting (RFS), that significantly improves on existing schemes in terms of viewer waiting time. Some lower bounds on the viewers' waiting time are also developed.