dynamic traffic grooming in elastic optical network made from a reserch paper
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This document presents a dynamic traffic grooming approach for elastic optical networks. It proposes using a multi-layer auxiliary graph to solve the electrical layer routing and optical layer routing/spectrum assignment problems. It also proposes a Spectrum Reservation scheme to improve bandwidth utilization. The approach uses an auxiliary graph constructed for each connection request, with nodes representing physical nodes and edge types for lightpaths, spectrum, and transponders. It then runs Dijkstra's algorithm on the graph to find a path for the request.
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dynamic traffic grooming in elastic optical network made from a reserch paper
- 2. Presented to: Dr. Rashid Hussain Dynamic Traffic Grooming in Elastic Optical Networks Project members: Anees Ahmed Awan BETL/H/F10/0102 Abdur Rehman BSTN/H/F10/0101 Imtiaz Ali BSTN/H/F10/0102
- 3. Contents Hamdard Institute of information & technology Abstract Introduction Dynamic Traffic Grooming Auxialiary Graph,Algori thim,Policies Illustrative Numerical Examples Spectrum Reservation (SR) Scheme
- 4. Abstract Hamdard Institute of information & technology
- 5. when provisioning new connection in an elastic optical network, control plane has to solve two problems. The electrical layer routing The optical layer routing and spectrum assignment Here in this presentation ,we propose a multi layer auxiliary graph to solve both these routing problems. We also propose a spectrum reservation scheme to tackle the bandwidth problem. Abstract
- 6. Introduction Hamdard Institute of information & technology
- 7. WhatisDynamicTraffic Grooming? WDM divides the optical spectrum of a fiber into separate channels with a spacing of 50 or 100 GHz. Optical transponders support fixed rate of typically 10,40,or 100 Gbps. This leads to inefficient utilization of resources. To handle this situation we use traffic grooming i.e. effectively increasing the efficiency of traffic utilization.
- 8. Archetecture of elastic optical network:- It uses different technologies like.. Bandwidth-variable transponders ROADMs (reconfigurable optical add-drop multiplexers) WSSs (bandwidth-variable wavelength selective switches)
- 9. Dynamic Traffic Grooming Hamdard Institute of information & technology
- 10. In Dynamic Traffic Grooming ,a connection request arrive one at a time & hold for certain time A connection request is represented by r(s,d,b) s= source d= destination b=requested bandwidth Dynamic Traffic Grooming
- 11. Auxiliary Graph, Algorithim, Policies Hamdard Institute of information & technology
- 12. Auxiliary graph is constructed each time a connection request arrive The node in the auxiliary graph represent a node in the physical topology There is one electrical layer and three optical layers as in example in the fig. There are three kinds of edges in the auxiliary graph: lightpath, spectrum & transponder edges. Auxiliary Graph
- 13. 1. When a connection request r(s,d,b) arrives: 2. Construct the auxiliary graph 3. Run Djikstra’s shortest path algorithim 4. If no path is found 5. block the connection request 6. If path contains transponder edges & spectrum edges then 7. Establish the new lightpath 8. end if 9. If path contains lightpath edges 10. route request along exiting lightpaths 11. end if 12. update network 13. End if 14. When connection termionates 15. Tear down all lightpaths 16. Update network state General Dynamic Traffic-Grooming Algorithim
- 15. Spectrum Reservation (SR) Scheme Hamdard Institute of information & technology
- 16. Due to large transmission capacity, a light path carrying small traffic is under utilized. Like in the example in the fig. two paths carrying different spectrum width through the same wire. We can also reserve spectrum for high-capacity transponders Spectrum Reservation Scheme Spectrum Usage Of The Two Lightpaths
- 17. Illustrative Numerical Examples Hamdard Institute of information & technology