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[38642] Artykuł:

Performance Overview of the Offset Time Emulated OBS Network Architecture

Czasopismo: Journal of Lightwave Technology   Tom: 27, Zeszyt: 14, Strony: 2751-2764
ISSN:  0733-8724
Wydawca:  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855 USA
Opublikowano: Lipiec 2009
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Procent
udziału		 Liczba
punktów
Mirosław Klinkowski25.00  
Davide Careglio25.00  
Josep Solé-Pareta25.00  
Marian MarciniakInstytut Łączności - Państwowy Instytut Badawczy25.00  

Grupa MNiSW:  Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A)
Punkty MNiSW: 24
Klasyfikacja Web of Science: Article

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Keywords:

telecommunication network routing  computer networks  optical burst switching  quality of service  phantom burst generation  offset time emulated optical burst switching network architecture  control architecture  optical packet switching  burst scheduling  backup routing  quality of service  preemption window mechanism  look ahead processing window  burst preemption  Complexity theory  Delay  Optical packet switching  Quality of service  Phantoms  Protocols  Control systems  quality of service 


Abstract:

Optical burst switching (OBS) control architecture considers two different models for the management of the offset time in the network. The conventional OBS (C-OBS) introduces the offset time in soft-way by delaying the transmission of the burst relative to its control packet in the edge node. Another idea for an OBS architecture (E-OBS) comes from optical packet switching world and it intends to emulate offset time by means of an additional fiber delay unit introduced in the data path at the input port of the nodes. Although C-OBS has attracted lots of attention, in this paper we highlight that it possesses many difficulties that can be entirely removed in E-OBS. Issues such as unfairness in resource reservation, efficiency and complexity of burst scheduling, difficulty with alternative and backup routing, and quality of service (QoS) provisioning are studied. Moreover, E-OBS facilitates the application of several enhanced mechanisms. As an example, in this paper we analyze a QoS application based on a preemption window mechanism, which expands look-ahead processing window technique to the burst preemption context. Results show that this mechanism can achieve the performance of the conventional preemption scheme while avoiding the well-known problem of phantom burst generation.


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