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Research on TCP over OBS and Design of OBS Ring Node

Author: ChenHeHe
Tutor: GaoZeHua
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Optical burst switching OBS DTP NAAM-CT Throughput Burst packet fragmentation
CLC: TN929.1
Type: Master's thesis
Year: 2010
Downloads: 25
Quote: 0
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Abstract


Optical burst switching (OBS) combines circuit switching and packet switching, bandwidth utilization high switching granularity in between . Compared to packet switching , OBS improve the exchange of granularity , the score group exchange is easy to implement , it is a promising switching technology . Although the research on it is still mainly theoretical research , but as the technology continues to improve , promising to become the core technology for the next generation of all-optical switching network . OBS research one of the most critical issues is how to avoid or reduce the random data bursts the conflict thereby reducing data loss rate , burst from the OBS edge node aggregation algorithm and burst resource competition strategy depth research . Assembly algorithm analysis of several mainstream aggregation algorithm based on a modified adaptive the aggregation mechanisms NAAM - CT ( Novel Assembly Mechanism based on Control- channel availability and Traffic type) , in order to better adapt to the network real-time changes in the business . In this algorithm , the burst is only in the case of burst control packet (BCP: Burst Control Packet) successfully sent to be sent to greatly reduce the network load larger packet loss rate . Adaptively adjusted and actual network data flow of the service type and needs different burst threshold adjustment step , combined with the network load , a flexible assembly threshold adjustment , effective to inhibit the end - to - end delay . The simulation results show that the new algorithm can adjust the burst assembly threshold adaptively according to changes in load , reduce packet loss rate and end-to-end delay of the network , thus greatly improving the performance of the network . For competitive strategy burst compete for resources on the issue , we study the basis of the previous algorithm , proposed a new algorithm considering burst QoS , the new algorithm proposed to guarantee the high priority burst successfully passed At the same time , taking into account the low priority burst performance improvement makes packet loss rate for priority consistent burst after the adoption of the new algorithm , can be made more balanced and smooth , increase the stability of the network , and simulation results also confirmed this point.

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