Research On Service-attributes-based Resource Provisioning Schemes And Approaches In Intelligent Optical Network

Traditional optical network plays the role of underlying network, it provides thetransmission bandwidth for customers and is not concerned about the types of trafficwhich is carried on it. With the rising of ION (Intelligent Optical Network)technologies, the optical network is transiting to "a service network",it can directlyoffer service to customers. To meet the needs of different customers personalized,optical network operators should appreciate the service attribution fully and developsnew service strategies for different kinds of traffic. This dissertation studies theproblem of resource provisioning in optical networks, new algorithms and schemes areproposed which exploit the information of service attributions, including availability,protection pattern, connect holding time and connection type.A failure in optical networks can cause tremendous loss in data and revenue. Toguarantee the service availability and handle network failures, shared protection iscommonly used. One promising shared protection approach has been proposed whichintroduce relative priorities among connections contending for access to the sharedbackup paths. In Chapter Two, a novel priority-aware shared protection algorithm isdeveloped, called FPS, for the dynamic connection provision. In FPS, the relativepriority between an incoming connection and an existing connection is flexiblydetermined to maximize the usage of backup wavelengths after ensuring not to violatethe SLA-defined availability requirement of the existing connection. Simulationsresults show that the FPS can obtain significant improvements on resourceoverbuilding ration and blocking probability compared with other shared protectionalgorithm. Moreover, to solve the problem of protection switch speed in sharedprotection, author researches the recovery time in the protecting lightpath activationscheme, and proposes a fast bidirectional activation signaling scheme. The new schemeallows activating the protecting lightpath from two opposite directions simultaneously,which can shorten the recovery time for protection switching. The analytic resultsshow that the bidirectional scheme can significantly reduce the notification&activation time in protection switching, and it uses less signaling messages, which candecrease the traffic load on control plane in failure case. Chapter Three studies the problem of power saving in shared protection RWA andOADM port assignment. The shared protecting lightpaths are soft-reserved in thecontrol plane but not lit during provisioning, so there isn't optical signal carried onthese lightpaths. Based on this, author proposes a power-efficient RWA algorithm forshared protection, called PA algorithm, which aims to minimize the number of activeoptical repeater devices. Simulation results indicate over40%power consumption ofrepeater devices can be saved by using the PA algorithm. As well, author introduces theOADM port assignment problem in shared protection, a new FFwO algorithm isproposed, which utilizes the characteristics of soft-reserved protecting lightpaths tominimizes the number of active OADM modules, and hence to conserve powerconsumption.The holding time is an important attribution of traffic. In ION, connections areallowed to be setup, configure, and release automatically, network operators couldknow the holding time of connections in advance based on the contracts withcustomers. Chapter Four studies the power efficient resource provisioning in dynamicnetwork. Based on holding-time-awareness, a RWA algorithm called HTAPE, anOADM port assignment algorithm called STA, and a traffic grooming algorithm calledPEP are proposed, which can shorten the time under working status with theknowledge of connection holding times, so that to reduce energy consumption ofnetwork equipments. In HTAPE algorithm, the number of optical repeater devices inworking mode is minimized, and hence the power consumption of optical repeaterdevices in the optical network can be reduced. With regard to the problem of OADMport assignment, the new STA algorithm reduces the energy consumption of theOADM device in the network. The holding-time-aware traffic grooming PEP algorithmmakes the minimum of the increasing network energy consumption due to theestablishment of new connections.In Chapter Five, author studies the resource provisioning problem for multicasttraffic in ION. The multicast signaling scheme is the focus in this chapter. The GMPLSsignaling protocol RSVP-TE doesn't have an excellent support for the setup ofpoint-to-multipoint light-tree. Author improves the RSVP-TE protocol and proposes anew multicast signaling scheme with two handshakes, which can solve the"Reservation collision" issue. Based on this signaling scheme, a converter-savingwavelength assignment algorithm is proposed. In networks with limited wavelength conversion capability, the new algorithm can significantly reduce the blockingprobability, at the expense of a high wavelength converter utilization.