HFC接入网时移电视业务的网络设计

HFC Access Network Design for Time-shift TV Service

基于服务端缓存的时移电视业务是一种带宽动态分配和终端独占的交互应用,边缘带宽主导了业务的部署费用.时移系统的网络设计取决于业务高峰期时的流量,提出了一种采用Erlang B模型进行时移电视流量分析的扩展机制,并定义了时移业务的服务性能指标.通过分析时移业务和时移点播用户的特征,可计算最优边缘带宽数目,达到网络带宽的优化使用和网络部署的最小费用.

Time-shift TV service based on server-cache is a dynamic bandwidth allocation and terminal exclusive interactive application, expenditure of edge QAM bandwidth dominates the costs of launching the service. Network design depends on the bandwidth demand at the peak of the business. An expanded mechanism is used to enable Erlang B model applicable to the traffic of time-shift TV service and also gives a definition of service performance. Through the analysis of the characteristics of time-shift TV service and user activities of on-demand, a formula is provided to calculate the optimal RF numbers that maximize the usage of network bandwidth and minimize the costs of network deployment.