关键词: 光组播, 节点结构, 最小转换度调度, 网络编码

Abstract:

Increasing of multicast application makes the packet loss probability and the probability of packet collision increase in optical switching node. To improve it, a novel optical multicast switching node architecture integrating with the advantage of multi-wavelength conversion technology and network coding technology is designed. A group of feedback shared limited range of multi-wavelength converters and a group of output shared network encoders are configured in the optical multicast node architecture. With respect to the minimal wavelength conversion degree in optical multicast scheduling, an improved maximal weighted stable set is designed to optimize the wavelength assignment. Comparing with the existing optical multicast nodes and algorithms, the simulation results show that the proposed node architecture and algorithm largely reduce the packet loss probability with low node cost and low delay to improve the optical node performance.

Key words: optical multicast, node architecture, minimal conversion degree scheduling, network coding