DocumentCode :
949494
Title :
Routing and wavelength assignment with multigranularity traffic in optical networks
Author :
Ho, Pin-Han ; Mouftah, Hussein T.
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Canada
Volume :
20
Issue :
8
fYear :
2002
fDate :
8/1/2002 12:00:00 AM
Firstpage :
1292
Lastpage :
1303
Abstract :
We propose a novel switching architecture of multigranularity optical cross-connects (MG-OXCs) for dealing with multigranularity traffic in the optical domain. MG-OXCs can cooperate with the generalized multiprotocol label switching (MPLS) control plane, which provides the advantages of cost reduction, better scalability in physical size, and unified traffic management. Detailed discussions are provided on the characteristics and implementation issues for the switching architecture. Based on the proposed MG-OXCs, two routing and wavelength assignment (RWA) with tunnel allocation algorithms are presented: dynamic tunnel allocation (DTA) and capacity-balanced static tunnel allocation (CB-STA). In the former, we use fixed alternate routing with k-shortest paths to inspect network resources along each alternate path for dynamically setting up lightpaths. For the latter, fiber and waveband tunnels are allocated into networks at the planning stage (or off-line) according to weighted network link-state (W-NLS). We will show that with the proposed algorithms, the RWA problem with tunnel allocation in the optical networks containing MG-OXCs can be solved effectively. Simulation is conducted on networks with different percentages of switching capacity and traffic load. The simulation results show that DTA is outperformed by CB-STA in the same network environment due to a well-disciplined approach for allocating tunnels with CB-STA.. We also find that the mix of the two approaches yields the best performance given the same network environment apparatus.
Keywords :
channel allocation; optical fibre networks; photonic switching systems; routing protocols; telecommunication network management; capacity-balanced static tunnel allocation; cost reduction; dynamic tunnel allocation; dynamically set up lightpaths; fixed alternate routing; generalized multiprotocol label switching control plane; k-shortest paths; multigranularity optical cross-connects; multigranularity traffic; network resources; optical domain; optical networks; physical size scalability; routing wavelength assignment; switching architecture; switching capacity; traffic load; tunnel allocation algorithms; unified traffic management; weighted network link-state; Communication system traffic control; Costs; Heuristic algorithms; Multiprotocol label switching; Optical fiber networks; Scalability; Size control; Telecommunication traffic; Wavelength assignment; Wavelength routing;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2002.800329
Filename :
1058135
Link To Document :
بازگشت