Yong-xiang Zhao, Chang-jia Chen, Yishuai Chen

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Presentation transcript:

A new scheme to provide reliable transmission in optical burst switch networks Yong-xiang Zhao, Chang-jia Chen, Yishuai Chen Beijing Jiaotong University

Optical burst switch (OBS) contention few optical buffer OBS assembles packets into burst to transfer in the optical core netwoks A key challenge faced by OBS networks is how to resolve burst contention that happens when two or more incoming bursts contend for the same output line (in the same wavelength) at an optical switch. There are few optical buffer in optical networks

Example: Switch E Input 1 Dropped by contention Input 2 Output time

How to improve? Coding? Add redundancy

Random Coding + ACK Block When idle, coding and send ACK Next block N raw bursts: {1,2,3} When idle, coding and send Random coding [1]: {2⊕1,2⊕3} ID List ACK Receiving node ACK to sending edge reliable transmission Next block

Simulation Dumbbell networks … … Utilization? Change Number of nodes 0.1 Change Number of nodes … … 1 0.1

Performance

2 Level Network Fixed Number Change Number of nodes

Reference [1] T. Ho, M. M´edard, J. Shi, M. Effros, and D. Karger. On randomized network coding. In Allerton, 2003.