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QoS/GoS Routing in Optical Networks

QoS/GoS Routing in Optical Networks. QoS/GoS Routing in Optical Networks. A2.2 - Study of traffic engineering concepts for end-to-end broadband services for all Route Management Area Traffic modelling and Characterization QoS aspects

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QoS/GoS Routing in Optical Networks

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  1. QoS/GoS Routing in Optical Networks NOBEL WP2 Meeting, Berlin 18-19 May 2004

  2. QoS/GoS Routing in Optical Networks • A2.2 - Study of traffic engineering concepts for end-to-end broadband services for all • Route Management Area • Traffic modelling and Characterization • QoS aspects „To study new methods for route management (intra- and inter-domain), so that the QoS performance figures are taken into account in the routing decisions.” NOBEL WP2 Meeting, Berlin 18-19 May 2004

  3. Objectives • Formulation of the o–SLS • Algorithms that will perform route computation and wavelength assignment according to the o-SLS • Environment • on-demand service • lightpath requests (digital service) • no wavelength conversion • arbitrary topologies NOBEL WP2 Meeting, Berlin 18-19 May 2004

  4. Classification of parameters • Grade of Service (GoS) • Provisioning parameters • Quality of Service (QoS) • analog parameters • digital parameters • Quality of Resilience (QoR) NOBEL WP2 Meeting, Berlin 18-19 May 2004

  5. Survey of the potential service parameters in optical network • GoS parameters • connection setup time • connection tear-down time • blocking probability • Provisioning parameters • client signal format • minimum lease time (holding time) • maximum lease time (holding time) • maximum number of connections (per user) NOBEL WP2 Meeting, Berlin 18-19 May 2004

  6. Survey of the potential service parameters in optical network • QoS digital parameters • BER • routing stability (probability that the working path is rerouted) • latency • latency variation (jitter) • forced tear-down probability • QoR parameters: • service availability • recovery time • maximum outage time • route differentiation (SRLG) • blocking probability of restoration NOBEL WP2 Meeting, Berlin 18-19 May 2004

  7. Routing and Wavelength Assignment • Lightpath request: NX->NY • Two main tasks: • choose route • assign wavelength • Maximize resources for future (unknown) requests • Minimize overall blocking probability • Choice • predetermined • dependent on network state NOBEL WP2 Meeting, Berlin 18-19 May 2004

  8. Routing and Wavelength Assignment • Tasks may be done sequentially, or simultaneously • Metrics/weights • hop count • number of free wavelengths on a link • number of continuous free wavelengths on a path • Centralised vs. distributed control • inaccurate network state information • resource allocation collisions NOBEL WP2 Meeting, Berlin 18-19 May 2004

  9. Routing Fixed Shortest Path Alternate k-shortest path k disjoint shortest path Least Congested Path Least Loaded Adaptive with precalculated paths Wavelength Assignment Random First Fit Incr/Decr Most Used Least Used Least Loaded Min Sum Max Sum RCL/DRCL Wavelength Reservation Routing and Wavelength Assignment NOBEL WP2 Meeting, Berlin 18-19 May 2004

  10. GoS Routing Strategies • Resource reservation • local • global • Forced Tear-down • Alternate Paths • Reserve and Wait • Rerouting NOBEL WP2 Meeting, Berlin 18-19 May 2004

  11. Analysis of the proposed scenarios • strengths and weaknesses • computational complexity • control plane requirements • lightpath set-up time • forced tear-down probability • qualitative and quantitative analysis NOBEL WP2 Meeting, Berlin 18-19 May 2004

  12. Current focus • Blocking probability is a prime concern • Our current focus: • consider only blocking probability • consider networks with centralized control • Other QoS/GoS/QoR parameters are left for further study NOBEL WP2 Meeting, Berlin 18-19 May 2004

  13. Summary • o-SLS parameters • GoS Routing Strategies • Discussion of the proposed scenarios NOBEL WP2 Meeting, Berlin 18-19 May 2004

  14. References • M. Fawaz, B. Daheb,O. Audouin, M. Du-Pond, G. Pujolle, „Service level agreement and provisioning in optical networks,” IEEE Communications Magazine, Vol.42, Iss.1, Jan. 2004 • P. Castoldi et al., „Definition of Network Management and Control requirements of network scenarios and solutions supporting Broadband Services for All,” Nobel Deliverable D2, May 2004 • H. Zang, J. P. Jue, B. Mukherjee, „A review of routing and wavelength assignment approaches for wavelength-routed optical WDM networks,” Optical Networks Mag., Vol. 1 no. 1, Jan. 2000, • S. Xu, L. Li, and S. Wang, „Dynamic routing and assignment of wavelength algorithms in multifiber wavelength division multiplexing networks,” IEEE Journal Selected Areas in Comm., vol. 18, pp. 2130-2137, Oct. 2000 • J. Spaeth, „Dynamic routing and resource allocation in WDM transport networks,” Computer Networks 32 (2000), pp. 519 – 538, May 2000. • Y. Yoo, S. Ahn, C. S. Kim, „Adaptive Routing Considering the Number of Available Wavelengths in WDM Networks,” IEEE Jourcal on Selected Areas in Communications, vol. 21, no. 8, Oct. 2003 NOBEL WP2 Meeting, Berlin 18-19 May 2004

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