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11 February 2005 Comparative study of signaling and routing schemes in ASTN
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Proceedings Volume 5625, Optical Transmission, Switching, and Subsystems II; (2005)
Event: Asia-Pacific Optical Communications, 2004, Beijing, China
We have developed a GMPLS-based software platform with Intelligence Optical Network (ION) capabilities to simulate different technologies and protocols of ASTN. For optical transport network (OTN) based ASTN, usually named as automatically switched optical network (ASON), two signalling schemes, Explicit Label Control (ELC) and Backward Wavelength Reservation with N retries (BWR-N), are considered. The ELC is associated with two routing and wavelength assignment (RWA) policies, the shortest path first routing (Dijkstra algorithm) with first-fit (FF) wavelength assignment and the fixed path least congestion (FPLC) routing with FF wavelength assignment. For the BWR-N, the route is determined by Dijkstra's algorithm and the wavelength is selected through signalling process. For SDH/SONET-based ASTN, we also consider two signalling scheme, the ELC and the Forward Timeslot Reservation (FTR). Similar simulations have been performed. These signalling and routing schemes are evaluated by several crucial metrics, such as the blocking probability, the setup time, the average routing length of the connections and the control overhead. Some significant conclusions have been presented by this paper.
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Hui Zhang, Yuanyuan Ma, Dongfeng Mao, Jie Zhang, and Wanyi Gu "Comparative study of signaling and routing schemes in ASTN", Proc. SPIE 5625, Optical Transmission, Switching, and Subsystems II, (11 February 2005);

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