A new per-VC scheduling scheme in ATM networks: two-phased weighted fair queuing

Authors:
J Cha;C Oh;K Kim;M Jang
Affiliations:
Electronics and Telecommunications Research Institute (ETRI), Taejon 305 350, South Korea;Department of Information and Communications, Kwang-Ju Institute of Science and Technology (K-JIST), Kwangju, South Korea;Department of Information and Communications, Kwang-Ju Institute of Science and Technology (K-JIST), Kwangju, South Korea;Electronics and Telecommunications Research Institute (ETRI), Taejon 305 350, South Korea
Venue:
Computer Communications
Year:
2001

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Abstract

The asynchronous transfer mode networks should support widely different characteristics of services with different quality of service requirements, and should achieve a fair use of the available bandwidth. This paper proposes a new per-VC scheduling algorithm not only to improve the performance of cell loss probability (CLP) and cell delay variation (CDV) but also to maintain the fair utilization of available bandwidth. The two-phased weighted fair queuing (TWFQ) scheme makes use of the cell inter-arrival time of each connection for determining the cell service order among connections, which contributes to get a small CDV. To achieve low CLP, the TWFQ scheme allows the connections, which are suffering from more bursty input traffic, to send the cell in advance by using two scheduling phases. The simulation results show that TWFQ scheme provides better performance than SCFQ and WRR in terms of CDV and CLP, and also performs as well on the criteria of mean cell delay and bandwidth fairness as those schemes.