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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 11    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 11, November 2011
Dynamic Contention Resolution Protocol for OBS Networks
Full Text(PDF, 3000)  PP.  
Author(s)
Wael Hosny Fouad Aly, Halima El-Biaze
KEYWORDS
OBS networks, contention resolution techniques, retransmission techniques.
ABSTRACT
Optical burst switching (OBS) is a switching technique that was proposed as a hybrid switching technology to support the next generation Internet. In OBS, incoming IP packets are assembled into super-sized packets called data bursts. Burst contention is a well-known challenging problem in Optical Burst Switching (OBS) networks. Burst contention can be resolved using several approaches, such as wavelength conversion, buffering based on fiber delay line (FDL) or deflection routing Retransmission technique is used to reduce the Burst Loss Ratio (BLR) by deflecting dropped bursts. Segmentation also resolves contention by dividing the contended burst into smaller parts called segments. Combining deflection routing technique and retransmission technique outperforms both pure deflection and pure retransmission techniques to improve the performance. Previous work uses only static combination of retransmission and deflection of bursts to reduce contention. This paper proposes a dynamic protocol to resolve contention based on combining deflection, retransmission and delaying bursts to improve the OBS performance. Experiments were conducted to test the proposed protocol. The proposed technique was tested on complex models such as NSFNET and COST238 topologies. Results show that the proposed protocol outperforms existing techniques in terms of burst lost ratio.
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