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中文摘要：
提出了一种基于GMPLS信令机制、考虑优先级抢占的M：N保护的网络模型及相关信令流程，对这种模型下的恢复阻塞率和平均恢复时间进行了理论分析。分析表明，该模型总能满足高优先级路径恢复时的低阻塞性来实现区分生存性的服务，并保证在平均恢复时间上与无优先级区分的机制相当。同时，仿真进一步验证了在节约保护资源的前提下，高优先级路径恢复请求被阻塞的现象比无优先级区分时有明显的改善。
英文摘要：
Based on GMPLS signal mechanism, a network architecture applied in M：N protection mechanism considering preemption is introduced, and corresponding signal process is shown. Through the analysis of the recovery blocking rate as well as average recovery time under the proposed architecture, the scheme guarantees a low recovery blocking rate for high priority path to provide differently survivability service, meanwhile make sure almost the same recovery time compared to M：N protection scheme with no priority difference. Finally, simulation results further prove that under the premise of resource reduction, a great improvement is made on the high priority path＇s recovery blocking rate compared to the scheme no considering preemption.
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