Title :
Adaptive QoS routing in dynamic wavelength-routed optical networks
Author :
Deng, Tao ; Subramaniam, Suresh
Author_Institution :
Dept. of Electr. & Comput. Eng., George Washington Univ., DC, USA
Abstract :
In transparent DWDM (Dense Wavelength Division Multiplexing) networks, high blocking rate of lightpaths due to unsatisfactory BERs (Bit Error Rates) can become a major traffic bottleneck. Most of the existing routing schemes have focused on reducing the call rejection rate that is caused by wavelength exhaustion on the assigned routes, without considering the inferior network BER performance that these schemes often produce. In this paper, we propose a dynamic AQoS (Adaptive Quality of Service) routing algorithm, which assigns routes based on real-time Q factor measurements collected from devices. Not only is it BER-friendly, the incorporated CLC (Constrained Least Congested) approach in route selection makes our algorithm wavelength-efficient as well. AQoS routing can work seamlessly with variable data rates and heterogeneous device characteristics. More importantly, it handles non-uniform networks and state changes in a much more flexible way than traditional schemes. Simulation results show that our routing algorithm gives the best overall performance in all tested scenarios.
Keywords :
Q-factor measurement; error statistics; optical fibre networks; quality of service; routing protocols; telecommunication congestion control; telecommunication traffic; wavelength division multiplexing; AQoS routing algorithm; BER; adaptive quality-of-service; bit error rate; constrained least congested approach; dense wavelength division multiplexing; dynamic wavelength-routed optical network; heterogeneous device characteristics; incorporated CLC; network traffic; real-time Q factor measurement; transparent DWDM network; Bit error rate; Optical fiber networks; Q factor; Q measurement; Quality of service; Telecommunication traffic; Testing; Wavelength division multiplexing; Wavelength measurement; Wavelength routing;
Conference_Titel :
Broadband Networks, 2005. BroadNets 2005. 2nd International Conference on
Print_ISBN :
0-7803-9276-0
DOI :
10.1109/ICBN.2005.1589614