Share Email Print
cover

Proceedings Paper

Scheduling algorithm for optical switches with configuration delay
Author(s): Fang Cheng; Zhizhong Zhang; Jiangtao Luo; Qijian Mao; Jun Wang; Shaofeng Qiu
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Utilizing optical technologies for the design of packet switches and routers offers several advantages in terms of scal-ability, high bandwidth, power consumption, and cost. However, the configuration delays of optical crossbars are much longer than that of electronic counterpart, which makes the conventional slot-by-slot scheduling methods no longer be-ing the feasible solutions. Therefore, there must find some tradeoff between the empty time slots and configuration overhead. This paper classifies such scheduling problems into preemptive and non-preemptive scenarios, each has its own advantages and disadvantages, and decides whether the traffic in one input queue should be completely transmitted in one switch configuration. Although non-preemptive scheduling is inherently not good at achieving above-mentioned tradeoff, it is shown, however, that the proposed maximum weight matching (MWM) based greedy algorithm is guaranteed to achieve an approximation 2 for arbitrary configuration delay, and with a relatively low time complexity O(N2). For preemptive scheduling, a novel 2-approximation heuristic is presented. Each time in finding a switch configuration, the 2-approximation heuristic guarantees the covering cost of the remaining traffic matrix to have 2-approximation. Simulation results demonstrate that 2-approximation heuristic (1) performs close to the optimal scheduling; (2) outper-forms ADJUST[1] and DOUBLE[3] in terms of traffic transmission delay and time complexity.

Paper Details

Date Published: 11 February 2005
PDF: 12 pages
Proc. SPIE 5625, Optical Transmission, Switching, and Subsystems II, (11 February 2005); doi: 10.1117/12.575248
Show Author Affiliations
Fang Cheng, Chongqing Univ. of Posts and Telecommunications (China)
Zhizhong Zhang, Chongqing Univ. of Posts and Telecommunications (China)
Jiangtao Luo, Chongqing Univ. of Posts and Telecommunications (China)
Qijian Mao, Chongqing Univ. of Posts and Telecommunications (China)
Jun Wang, Chongqing Univ. of Posts and Telecommunications (China)
Shaofeng Qiu, Chongqing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 5625:
Optical Transmission, Switching, and Subsystems II
Cedric F. Lam; Wanyi Gu; Norbert Hanik; Kimio Oguchi, Editor(s)

© SPIE. Terms of Use
Back to Top