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An efficient scheduling discipline for packet switching networks using earliest deadline first round robin*

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2 Author(s)
D. Liu ; Dept. of Comput. Sci., Arizona State Univ., Tempe, AZ, USA ; Y. -H. Lee

In this paper we propose a frame-oriented scheduling discipline, EDF-RR (earliest-deadline-first round-robin), for OQ (output-queued) switch architecture and data traffic consisting of fixed-length cells. Bandwidth reservation for an active session is performed by holding a number of cell slots for the session in frames. Each cell that is going to be transferred in a frame is assigned a virtual release time and a virtual deadline according to the bandwidth reservation scheme. The transmitting order of the cells in frames is thus determined by nonpreemptive nonidling EDF algorithm so that cells of a backlogged session in frames are distributed as uniformly as possible. Through the analysis applying real-time scheduling theory and network calculus as well as network simulation, EDF-RR takes the advantage of low computational complexity, and possesses tight delay bounds and lenient buffer requirements. The proposed scheduling discipline is appropriate for distributed real-time systems as we show that sessions can be configured based on message traffic models and deadline requirements. Also, a modified version of EDF-RR, called EDF-DRR, can be applied as traffic regulator when jitter requirements exist among active sessions.

Published in:

Computer Communications and Networks, 2003. ICCCN 2003. Proceedings. The 12th International Conference on

Date of Conference:

20-22 Oct. 2003