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VD/VS Coupling Scheme Using Feed-Forward Congestion Indication for ABR Services in Wireless ATM
Fusao NUNO Yoichi MATSUMOTO
IEICE TRANSACTIONS on Communications
Publication Date: 1998/12/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on the Latest Development of Telecommunication Research)
Category: QoS Control and Traffic Control
ABR, virtual destination/virtual source, wireless ATM, flow control,
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This paper explores virtual destination (VD)/virtual source (VS)-based available bit rate (ABR) flow control performance, targeting wireless asynchronous transfer mode (WATM) application that can incur long link-delays because of employing radio-medium sharing and/or radio-specific data link control schemes. As this paper reveals, the conventional VD/VS scheme has difficulty in sustaining satisfactory ABR performance, when it is applied to long-delay-causing WATM; it suffers from significant increase in the necessary buffer capacity. To ensure the ABR performance in WATM, this paper proposes a new VD/VS coupling scheme using a feed-forward congestion indication. The proposed scheme controls the allowed cell rate of a source end system in a feed-forward manner by predicting the queue length at the time the WATM-associated-round-trip ahead. Simulation results show that the proposed scheme exhibits excellent ABR performance with a long delay of the divided loop on the radio-link side. It is also verified that the proposed scheme is rather robust against uncertainty and/or time-variation regarding the predetermined radio link delay.