Differentiated service support in optical burst switching WDM networks.

详细信息   

• 作者：Liu ; David Q.
• 学历：Doctor
• 年：2003
• 导师：Liu, Ming-Tsan Mike
• 毕业院校：Ohio State University
• 专业：Computer Science.
• CBH：3124362
• Country：USA
• 语种：English
• FileSize：1116064
• Pages：258

文摘

The explosive growth of Internet traffic provides strong incentives to exploit the huge bandwidth of (dense) wavelength division multiplexing fiber optical networks. Real-time applications, such as videoconferencing, and telemedicine, require higher Quality of Service than the current best-effort IP service. Differentiated Service (DiffServ) architecture has been proposed recently by the Internet Engineering Task Force as a scalable and manageable architecture for service differentiation in IP networks and the Internet. Compared with other optical switching technologies such as wavelength routing and optical packet switching, Optical Burst Switching (OBS) takes advantage of both mature electronic control processing and high-speed optical data transmission technologies. It is very important to provide DiffServ support in OBS WDM networks in order to meet future Internet bandwidth and QoS demands.;This research proposes a Differentiated Optical Burst Service (DOBS) model and its network architecture. The OBS resource reservation and scheduling process is modeled as a queueing network. The burst loss probability conservation law is proved for the M/M/K/K priority loss system when all bursts of various priority classes have the same service rate. Two burst scheduling schemes are designed to support DiffServ in OBS WDM networks. The priority-based burst scheduling (PBS) scheme processes control packets based on their priority classes and preempts one or more lower priority bursts if necessary. The Differentiated Burst Scheduling (DS) scheme schedules high priority bursts earlier than lower priority bursts only if the high priority bursts arrive with a certain period of time after the lower priority bursts. Both the PBS and DS schemes guarantee the multimedia data synchronization. DS also allows each core node to dynamically support differentiated services according to its resource and capacity. The performances of PBS and DS are evaluated in terms of burst loss probability by extensive simulations for a single link in a core node as well as for the ABILENE network with two wavelengths per link and two priority classes. Both exponential and Pareto distributions are considered for the control packet inter-arrival times and burst lengths.