Design And Simulation Of Dynamic RWA Algorithm With QoS And Link Protection Mechanism

Wavelength and routing mechanism is one of the key technologies in optical networks, it refers to choose a routing and assign an available wavelength for the service requests. To distinguish different users/services, and offer some kind of link protection capability, the QoS and link protection mechanism is needed. In this work, it will focus on the issue that a new kind of RWA algorithm with QoS and link protection mechanism.First, the key technologies that support RWA mechanism are studied, including routing and wavelength mechanism and functioned modules of control plane. Then, the major defaults of the existing RWA mechanism are summed up:1) choose routing and then assign wavelength;2) doesn’t support QoS;3) the incomplete link protection mechanism. For accomplishing the routing chose and wavelength assignment at the same time, a new kind of load balanced dynamic RWA algorithm is put forward. It can accomplish the whole network load balanced and RWA at the same time. Based on the load balanced dynamic RWA algorithm, a new kind of dynamic RWA algorithm with QoS and link protection mechanism—QPM_DRWA algorithm is put forward to support QoS and the network’s survivability. The major solution of this algorithm is: based on the load balanced dynamic RWA algorithm, supporting the higher priority service request deprive the resource that is assigned to the lower priority service request’s protection links to support QoS; And at the aspect of choosing protection routing, insure that there isn’t any the same links between protection and working routing to support the network’s survivability with best effort. Through putting these mechanisms together, QPM_DRWA algorithm can finish the whole network load balance to optimize the rate of service blocking, accomplish routing choose and wavelength assignment at the same time, support the priority right of the higher priority service requests, and support the network survivability with best effort. Even when there are some links destroyed, this QPM_DRWA algorithm can maintain a rational network performance.Simulation results show that, in the trouble-free network, compared with the traditional Alternate Routing algorithm, the load balanced RWA algorithm can improve the parameters by40%、43%, at the aspects of blocking proportion and rate of QoS guarantee. And in the trouble network, compared with the load balanced RWA algorithm, QPM_DRWA algorithm can improve the parameters by42%、48%, at the aspects of blocking proportion and rate of QoS guarantee. It means, whether the network is trouble-free, QPM_DRWA is a better algorithm, and can offer the network a better performance.