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Title: A flexible contention resolution scheme for QoS provisioning in optical burst switching networks
Authors: Turuk, A K
Kumar, Rajeev
Keywords: Optical burst switching; Wavelength division multiplexing; QoS; Contention resolution; Blocking probability; Channel selection algorithm,Poisson and bursty traffic
Issue Date: 2006
Publisher: Elsevier
Citation: Computer Communications, Vol. 29 Issue 12, pp 2361 - 2376, Year 2006
Series/Report no.: Vol. 29 Issue 12, pp 2361 - 2376;
Abstract: Contention resolution is a major issue in bufferless optical burst switching (OBS) networks. The existing contention resolution schemes consider priority and arrival time to resolve contention. For most multimedia applications priority and delay are key parameters for QoS provisioning. In this paper, we propose a new signaling protocol for reducing contention in OBS networks and consider three parameters, namely, priority of the burst, number of hops traversed, and burst size into account to resolve contention. The source node in the proposed protocol can be informed of the contention up to halfway along the path of the burst, and thus, can reschedule the burst accordingly. The scheme is adaptable to both prioritized and delay constrained traffic. We call the scheme OBS-Flex. For selecting a data channel, we propose three channel selection algorithms, namely, Least Recently Used (LRU), First Fit (FF), and Priority Set (PS). We simulate OBS-Flex and compare with preemptive priority just-enough-time (PPJET) contention resolution scheme. We show that OBSFlex outperforms PPJET in terms of burst loss rates. For simulation, we have considered Poisson and bursty traffic models.
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