Advances in enabling technologies and the explosive growth of Internet traffic has led to the widespread proliferation of network systems in recent years. With their relatively low cost, high throughputs, high-bandwidth utilization, and low-transmission latency, Optical Burst Switching (OBS) networks represent an ideal solution for next-generation Internet applications. However, in OBS networks, Burst Header Packet (BHP) contentions occur when two or more BHPs are switched simultaneously to the same output port of a given core node. These contention events result in significant losses of the corresponding data burst. Accordingly, this study presents a Store-and-forward COntention-REsolution mechanism, designated as SCORE, which utilizes fiber delay line buffers to resolve the BHP collision problem, thereby minimizing the burst loss rate. The results of a series of simulations performed using an OIRC OBS-ns simulator confirm the effectiveness and efficiency of the proposed scheme.
This study develops a Fair and Efficient Integrated Media Access Control (FEIMAC) protocol, designated FEIMAC, for a wavelength division multiplexing (WDM) dual-ring network known as FT 2 -TR 2 . This system is an extended version of the original unidirectional FT-TR ring architecture, in which the nodes are equipped with a fixed-tuned transmitter and a tunable receiver on each ring. FEIMAC is derived from the Fairness Control with Collision Avoidance (FCCA) protocol proposed in a previous study by the current authors (Chang, W.-R. et al.: FCCA: A reversedirection-based MAC protocol suite for WDM Metropolitan Ring Networks, Proc. of IEEE APCC 05, Perth, Australia, October 2005, pp. 946-950). FCCA is a collision-free medium access control (MAC) protocol, which achieves an efficient exploitation of the available bandwidth while guaranteeing each node a fair access to the network resources. In addition to the capabilities described above, FEIMAC employs a framed approach, in which each frame consists of a "real-time subframe" followed by a "best-effort subframe", to support differentiated services of real-time and best-effort traffic streams. The simulation results demonstrate the effectiveness and efficiency of the proposed integrated protocol.
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