QoS Supporting Algorithms for Optical Internet Based on Optical Burst Switching |
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Authors: | So Won-Ho Lee Hae-Chong Kim Young-Chon Roh Sun-Sik |
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Affiliation: | (1) Department of Computer Engineering, Chonbuk National University, 561–756, Korea;(2) Division of Computer, Electronics and Communications Engineering, Gwangju University, 503–703, Korea |
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Abstract: | In this paper, we propose a protocol architecture and quality of service (QoS) supporting algorithms for optical Internet based on optical burst switching (OBS) technology. Firstly, the function of each layer of the protocol architecture and the formats of control packets are defined in order to adopt GMPLS to the control plane of OBS. Then, the offset time decision (OTD) algorithm to cooperate with the proposed protocol architecture is designed for optical Internet. A new burst loss formula taking into account the effect of offset time is introduced to design the OTD algorithm. This algorithm can decide on the appropriate priority-offset time according to the required QoS by using the reversed equation of the so-called heuristic loss formula (HLF) which is approximated as a proportional equation of our new loss formula. Finally, we propose a CAC algorithm based on the OTD algorithm for the purpose of increasing the availability of wavelength resources and supporting the QoS of established connections in optical Internet. The performance of the proposed algorithms is evaluated in terms of burst loss rate and the number of connections through simulation. |
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Keywords: | optical switching optical burst switching (OBS) offset time decision QoS GMPLS |
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