Lightpath routing considering differentiated physical layer constraints in transparent WDM networks
2009 (English)In: Network Architectures, Management, and Applications VII, 2009, 76331D- p.Conference paper (Refereed)
Wavelength division multiplexing (WDM) technology is considered to be the ultimate answer to the rapidly growing capacity demand of next generation networks. Many routing and wavelength assignment (RWA) algorithms, proposed for lightpath provisioning, base their routing decisions on the availability of network resources, and assume that optical fibers and components are ideal. In reality, physical impairments degrade the quality of the optical signal propagating through fiber segments and optical components. To cope with this problem, Impairment Constraint Based Routing (ICBR) algorithms, that consider physical impairments during connection provisioning, are currently proposed to prevent selecting lightpaths with poor signal quality. However, these algorithms support only a single (highest) quality of transmission threshold, the same one for all connection requests. This does not fit well with the variety of services, with potentially disparate QoS requirements, that the next generation networks are expected to support. Consequently, the efficiency of network resource utilization is reduced. This paper demonstrates that a significant improvement, in terms of blocking probability, can be achieved when using an ICBR algorithm with differentiated physical layer constraints. Performance is compared with conventional impairment aware routing approaches when unprotected, shared path protected (SPP), and dedicated path protected (DPP) connection requests are considered. The achieved improvement is a result of more efficient resource utilization as unnecessary connection blocking can be avoided by selecting network resources offering optical signal quality that is "good enough" to satisfy a specific connection request.
Place, publisher, year, edition, pages
2009. 76331D- p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 7633
Capacity demands, Connection blocking, Connection provisioning, Constraint based routing, Fiber segments, Light path, Lightpath provisioning, Lightpath routing, Network resource, Network resource utilization, Next generation network, Optical components, Optical signals, Physical impairments, Physical layers, QoS requirements, Quality of Transmission, Resource utilizations, Routing and wavelength assignment algorithms, Routing approach, Routing decisions, Signal quality, WDM networks, Algorithms, Blocking probability, Fiber optic networks, Multiplexing equipment, Optical communication, Optical fibers, Optical signal processing, Quality of service, Telecommunication networks, Wavelength division multiplexing, Network architecture
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-152729DOI: 10.1117/12.852202ScopusID: 2-s2.0-73849100714ISBN: 978-081948035-4OAI: oai:DiVA.org:kth-152729DiVA: diva2:757262
Network Architectures, Management, and Applications VII, 2 November 2009 through 6 November 2009, Shanghai, China
QC 201410212014-10-212014-10-012014-10-21Bibliographically approved