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基于小尺寸缓存的提前预留机制是有效的竞争解决方案.为支持区分服务,本文研究了两优先级提前预留机制的阻塞模型,分析了变化缓存尺寸与载荷比率条件下光突发交换网络核心节点的阻塞性能.为降低两优先级提前预留机制的突发丢弃率,提出一种基于流量门限的提前预留机制.数值分析确定了合理的缓存尺寸与流量门限,实现了高、低优先级间的缓存使用平衡.仿真结果表明:与原有提前预留机制相比,基于流量门限的提前预留机制保持了全流量状态范围内的阻塞性能,并明显降低了中、低流量状态内的突发丢弃率.
Pre-reservation mechanism based on small size cache is an effective competitive solution.In order to support differentiated services, this paper studies the blocking model of two-priority pre-reservation mechanism, and analyzes the optical burst switching network under the condition of varying buffer size and payload ratio To reduce the abrupt discard rate of two priority preemption mechanisms, an early reservation mechanism based on traffic threshold is proposed.The numerical analysis determines the reasonable buffer size and traffic threshold, and achieves high and low Compared with the prior advance reservation mechanism, the advance reservation mechanism based on the traffic threshold maintains the blocking performance in the range of full traffic status and obviously reduces the medium and low traffic status Within the burst discard rate.