On the stability of multicast flow aggregation in IP over optical network for IPTV delivery
罗萱 Xuan Luo, 金耀辉 Yaohui Jin, 曾庆济 Qingji Zeng, 孙卫强 Weiqiang Sun, 郭薇 Wei Guo, Weisheng Hu · Chinese Optics Letters · 2008
The stable multicast flow aggregation (MFA) problem in internet protocol (IP) over optical network under the dynamical scenario is studied.Given an optical network topology, there is a set of head ends and access routers attached to the optical network, in which each head end can provide a set of programs (IP multicasting flows) and each access router requests a set of programs, we find a set of stable light-trees to accommodate the optimally aggregated multicast IP flows if the requests of access routers changed dynamically.We introduce a program correlation matrix to describe the preference of end users' requests.As the original MFA problem is NP-complete, a heuristic approach, named most correlated program first (MCPF), is presented and compared with the extended least tree first (ELTF) algorithm which is topologyaware.Simulation results show that MCPF can achieve better performance than ELTF in terms of stability with negligible increment of network resource usage.