QLWFQ: a queue length based weighted fair queueing algorithm in ATM networks

A work conserving O(1) per-VC queueing algorithm named QLWFQ (Queue Length based Weighted Fair Queueing) for high-speed ATM networks is proposed. The basic process in QLWFQ is the comparison of the current queue length with the weight when a cell arrival or departure occurs. QLWFQ has upward compatibility with fair queueing and FIFO, and can be considered to be a simplified version of weighted round robin. A delay bound and a fairness index are derived analytically for the QLWFQ algorithm. The simulation results for heavily and lightly loaded conditions are also presented. The analytical and simulation results show that QLWFQ achieves a better balance between traffic isolation and traffic sharing than timestamp based algorithms