通过网络编码方法优化多核点选择和组播信息传输, 本文提出一种基于多核点共享树和网络编码的光组播路由构造和波长分配方法、减少波长资源消耗和提高网络的负载平衡性能.首先, 删除产生源点迂回回路的网络编码备选核点集合, 采用启发式矩阵运算方法确定多源共享树的网络编码核点, 实现多源共享树以最少的核点覆盖最多的源节点；然后, 为减少波长信道消耗数目, 在确定的核点到目的节点间加入网络编码方法传输信息；最后, 讨论了多核点共享树的波长分配方法和目的节点成功解码的边分离路径方法.仿真结果表明: 与单核共享树、基于网络编码的单核共享树相比, 基于网络编码的多核点共享树组播路由方法需求最少的波长数目和获得最好的网络负载平衡性能.

Network coding was introduced to optimize the selection of multi-core nodes and transmission of multicast information. A method was proposed to construct optical multicast routing based on multi-core node shared tree and network coding to decrease the wavelength consumption and to improve the performance of network load balance. The network coding candicate core node set was produced by deleting the nodes which lead to the source node bypass loop. The network coding core nodes of multi-source shared trees were determined by utilizing the heuristic matrix operation to achieve the minimal core nodes covering the maxmial source nodes. Then, the network coding was applied to transmit the information between the core nodes and destination nodes to reduce the wavelength consumption. And, the wavelength assignment and edge disjoint path were discussed for the multi-core node shared tree. Comparing with the multicast routing with single-core shared trees and singel-core shared trees based on the network coding, the simulation results show that the multicast routing with multi-core node shared trees based on network coding can get the least required wavelenght and achieve the best performance of network load balance.