Study On Key Technologies Of Routing And Survivability In Traffic Oriented Intelligent Optical Networks

Traffic-oriented provisioning is the key evolution direction of intelligent optical networks (ION). This dissertation undertakes a systemic study on the key technologies of routing and survivability in traffic oriented intelligent optical networks (TOION) via theoretical analyses, and discrete event simulations (DES), in order to promote the infrastructure research and the application of TOION.Priority-based alternate routing scheme (PAR) was proposed for multiple classes of traffic in ION. DES shows that, compared to traditional wavelength reservation based priority scheme (RES) and threshold-based priority scheme (THR), PAR can not only guarantee low blocking of traffic with high priority, but also largely decrease the average blocking probability (ABP) of the optical networks. Much better results were gotten by dynamic priority-based alternate routing scheme (DPAR) based on linear link weight function and piecewise linear link weight function.Multilayer routing on restricted path (MRRP) was proposed to fulfill the transportation of traffic in IP-over-WDM networks. The main characteristic of MRRP is that the traffic can only be groomed into the light-paths on the restricted path(s) (RP(s)) for given source and destination. DES shows that, compared to the dynamic multilayer routing (DMR), MRRP with DVP-DKSP-MVLRP steps has lower blocking probability (BP) and lower average physical hops (APH). In other words, MRRP provides lower BP with less network resource occupation.Bandwidth reservation based priority scheme (BRPS) and restricted path based priority scheme (RPPS) were proposed to support the multi-service transportation in IP-over-WDM networks. DES shows that bandwidth reservation and restricted path based priority scheme (BRRPPS) has the advantage of both BRPS and RPPS, and has low blocking performance under all range of network traffic load. In addition, compared to BRPS, the BP difference of RPPS and BRRPPS can be adjusted dynamically by differentiating the number of RP. That means RPPS and BRRPPS has powerful capability to provide service differentiation.Multilayer restoration of traffic under fiber failure in IP-over-WDM networks was investigated. It was found that, compared to top-down multilayer restoration scheme (TD), bottom-up multilayer restoration scheme (BU) has higher restoration probability and much shorter restoration time. Equality based restoration in optical layer and time based restoration order in IP/MPLS layer (EROTRIP) was proposed to guarantee the restoration probability of the traffic with high priority. It was found that EROTRIP can not only provide high restoration probability for traffic with high priority, but also shorten its restoration time. In order to evaluate the total performance of multilayer restoration and routing, the correlation between multilayer restoration and routing was proposed in this dissertation. A new variable, blocking probability to restoration probability ratio (BRR), was introduced as the evaluation index. It was found that the BRR of MRRP is much smaller than that of DMR, which proves that network routing with MRRP has much better performance than that of DMR. This conclusion is also true for multi-service network environment.