Research On Scheduling Policy Of C-DOCSIS Upstream Service Flow

The Broadcast Television Network in China meet the unprecedented opportunities of development and transition since the coming out of the "triple play" concept and related national strategy.Broadcast Television Network operator in China must make use of the rich resources of coaxial cable to develop high-quality high-bandwidth broadband access technologies.So that they can confront the challenges of the OTT service such as VOD,and the rapid development of optical access service provided by traditional telecommunication operator.C-DOCSIS is one of the promising technologies which can challenge for optical access technology.The inherent defects of the HFC such as high latency,asymmetric uplink and downlink bandwidth,lack of upstream bandwidth must be overcome to accomplish this ambitious goal.So the significance of this study is improving C-DOCSIS upstream transmission performance.The evolution and characteristics of HFC network,and the C-DOCSIS standard,especially the upstream traffic scheduling mechanism and five basic types of service flow were studied in this thesis.Based on this,the feasible scheduling algorithm for real-time traffic and non-real-time traffic was put forward,as well as reasonable and efficient queue management algorithm.Then the feasible scheduling policy of upstream Service Flow for CMC and CM was put forward and tested with experiment.Finally,The proposed scheduling policy of upstream service flow is proved to have improved the bandwidth utilization of the shared upstream channel of HFC effectively,reduced the latency of real-time traffic and the loss of non-real time traffic.So the proposed scheduling policy is feasible and efficient.