Study Of Differentiated Resource Assignment Algorithm Based On Multi-parameter Constraints In All Optical Networks

The optical networks are developing to a more transparent and diverse direction. Inoptical networks, the rising traffic volume and the global energy crisis lead tochallenges of high energy efficiency in communication networks. In addition, thephysical layer impairments introduced by non-ideal devices in all-optical networks willdegrade the quality of transmission (QoT) of optical signal, since the photoelectricregenerators in all optical networks are removed. However, the physical layerimpairments not only degrade the QoT, but also impact the quality of service (QoS).The process of handling the impairments increases the setup delay, and there are alsotrade-offs between energy consumption and QoS. Different class of service also needsdifferentiated performance. The impact those aspects described above may lead todegradation on the quality of the optical signals. Thus, how to design the resourceassignment algorithm to guarantee the quality of optical signals of different service isvery important.In this paper, we investigate the impact of impairments, QoS and energyconsumption on the process of resource assignment. Then we study the impact ofimpairments on QoT by designing the impairment-aware resource assignment algorithmbased on the wavelength rotation graph model. In addition, we study the impact of theimpairments on the performance of QoS, and the trade-off between QoS and energyconsumption. On this basis we design a bidimensional QoS differentiation frameworkunder the constraint of impairments and setup delay to guarantee the demands ofdifferent class of service. Then we propose a spectrum partition-based resourceassignment algorithm to mitigate the inter-channel effect and balance the trade-offbetween QoS and energy consumption in mixed line rate (MLR) scenario. The mainparts of this paper are shown as follow:(1) This paper designs the impairments aware routing and wavelength assignmentalgorithm with single-parameter constraints based on the wavelength rotation graphmodel. The designed algorithm considers the degradation of QoT in all optical networksand decreases the impact of impairments and guarantees the demand on QoT.(2) Considering the impact of physical layer impairments on QoT and setup delay,this paper designs a bidimensional QoS differentiation framework. This QoS framework divides service classes according to the requirements on bit error rate (BER) and setupdelay. On this basis a routing and wavelength assignment algorithm is proposed. In theproposed algorithm, the resources with signal quality that can match the requirements of theservice are allocated firstly. The algorithm can decrease the blocking probability as wellas satisfy the requirements for QoS and QoT.(3) This paper designs a spectrum partitions-based spectrum assignment algorithmto mitigate the inter-channel effect caused by channels with different modulation formatin MLR scenario. The designed spectrum partitions-based spectrum assignmentalgorithm reduces the inter-channel effects by provisioning traffic with different rate atdifferent partitions. In addition, considering the trade-off between QoS and energyconsumption, two routing strategies are designed, in which the lightpaths with satisfyingQoS is provided to the high quality traffic firstly, the lightpaths with least energy isprovided to the low quality traffic and the QoS is taken as the constraint of the energyefficient lightpath. The designed algorithm can guarantee QoT and QoS, and also reducethe energy consumption and the blocking probability of the network.