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现有的多粒度光交换一般只支持光纤、波带和波长这三种粒度的光交换,其最小粒度通常为波长粒度。针对这种缺陷,提出了一种支持突发粒度的多粒度光交换方案,包括支持突发粒度的多粒度光交换的节点结构、路由策略、波带分配算法。这种方案利用了光突发交换的交换粒度小、统计复用特性等优点来提高链路利用率,同时利用多粒度光交换减少光交叉连接(OXC)的端口数和降低OXC的成本。仿真结果表明,所提出的支持突发粒度的多粒度光交换能有效降低包丢失率和端对端时延。
The existing multi-granularity optical switching generally only supports the optical switching of three granularities of optical fiber, wavelength band and wavelength, and the minimum granularity is usually a wavelength granularity. In view of this defect, a multi-granularity optical switching solution supporting burst granularity is proposed, including node structure, routing strategy and band allocation algorithm supporting multi-granularity optical switching with burst granularity. This scheme utilizes the advantages of small switching granularity of optical burst switching, statistical multiplexing, etc. to improve the link utilization, meanwhile, it reduces the number of optical cross-connect (OXC) ports and reduces the cost of OXC by using multi-granularity optical switching. The simulation results show that the proposed multi-granularity optical switch supporting burst granularity can effectively reduce packet loss rate and end-to-end delay.