Advanced HFC Access Network Design for Switched Digital Video Service
Jian Xu, Hong Ni, Hao Jiang Deng, Lei Liu · Advanced materials research · 2013
Switched Digital Video (SDV) is an emerging method of distributing TV programs through the Hybrid Fiber Coax (HFC). Compared with traditional broadcast method, it reduces spectrum requirements by sending TV programs only to those subscribers who actually ask for them. The focus of this paper is to calculate the minimum bandwidth consumption to launch SDV service, which depends on human TV watching behavior, the popularity of available TV programs, the number of available TV programs, streaming bit-rate composition and subscriber group size. Through the analysis of the characteristics of these factors, in particular subscribers channel flipping behavior, we develop a traffic model of an SDV system and present an advanced access network design tool. Our results suggest that channel flipping has much effect on the bandwidth requirements.