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为了解决IP over DWDM(dense wavelengthdivision multiplexing)网络的多业务传送问题,提出了基于带宽资源预留的优先级方法BRPS与基于限定路径的优先级方法RPPS。BRPS通过预留虚链路中部分带宽,为高优先级业务提供服务质量保证;而RPPS通过限定路径,提供区分服务。离散事件仿真结果表明:相对于传统的基于波长资源预留的优先级方法而言,BRPS在低负载时有较低的阻塞率。网络负载强度大于800 Erlang时,RPPS的平均阻塞率比BRPS低。RPPS中各等级业务间阻塞率的差异可以通过改变限定路径的数目动态调节,具有较强的提供区分服务的能力。
In order to solve the problem of multi-service transmission in dense wavelengthdivision multiplexing (IP over DWDM) networks, a priority method BRPS based on bandwidth resource reservation and a priority method RPPS based on the limited path are proposed. BRPS provides QoS guarantees for high-priority services by reserving part of the bandwidth in the virtual links, while RPPS provides differentiated services by limiting the paths. Discrete event simulation results show that BRPS has a lower blocking rate at low load compared to traditional wavelength resource reservation based priority methods. When the network load intensity is greater than 800 Erlang, the average blocking rate of RPPS is lower than BRPS. The difference between the blocking rates of all classes of services in RPPS can be dynamically adjusted by changing the number of qualified paths and has a strong capability of differentiating services.