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Proceedings Paper

An offset differential assembly method at the edge of OBS network
Author(s): Zhicheng Sui; Qingji Zeng; Shilin Xiao
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Paper Abstract

Traditional burst assembly method only differ service class priority by increasing extra offset time so as to assure QoS at Optical Burst Switching (OBS) core node which increases all network delay extremely, especially for optical network with many hops and large radius. In order to take full advantage of flexible buffer and control function of electronics device and optical large capacity predominance, it is desired to process real-time traffic at edge ingress node and guarantee delay fairness under small enough delay and QoS based on offset time differentiation for various classes. To achieve lower assembly delay at OBS edge node and offset time based QoS guarantee at core node, this paper proposes an approach called Prediction and Offset QoS Assembly (POQA) to improve existing burst assembly mechanism at edge node. POQA method takes into account the delay fairness and QoS-based offset time adequately. The ratios of assembly time and offset time are introduced to make a delay and offset differentiation among various traffic classes. Assembly delay, burst size, burst utilization and length error of various classes are compared under different offered load. Moreover, in contrast with traditional time assembly method, simulation results show that POQA method can achieve a significant improvement in terms of burst delay and utilization and realize the delay fairness and offset time QoS differentiation under different traffic offered load.

Paper Details

Date Published: 8 December 2005
PDF: 6 pages
Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 60213T (8 December 2005); doi: 10.1117/12.636019
Show Author Affiliations
Zhicheng Sui, Shanghai Jiao Tong Univ. (China)
Qingji Zeng, Shanghai Jiao Tong Univ. (China)
Shilin Xiao, Shanghai Jiao Tong Univ. (China)


Published in SPIE Proceedings Vol. 6021:
Optical Transmission, Switching, and Subsystems III
Rodney S. Tucker; Dominique Chiaroni; Wanyi Gu; Ken-ichi Kitayama, Editor(s)

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