多波长转换结合网络编码的光组播结构和最小转换度调度

An Optical Multicast Node Architecture with Multi-Wavelength Conversion and Network Coding and Its Scheduling Respect to Minimal Conversion Degree

组播的应用使光交换节点的丢包率和分组竞争概率增加.为解决这个问题,综合考虑节点的结构代价和丢包率性能因素,设计一种反馈共享的有限范围多波长转换器和输出共享的基于逻辑运算的全光网络编码器结合的光组播节点结构,并在光组播调度策略中着重考虑最小化波长转换度的组播冲突问题,提出一种基于改进的最大权重独立集算法的波长分配方法.仿真结果表明,相比现有的光组播节点及算法,该结构能够在低成本代价和低时延的基础上降低丢包率,提升了光组播节点的性能.

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.