Abstract

This paper presents a congestion control protocol for ad-hoc Wireless-LAN (WLAN) with Bandwidth-on Demand (BoD) access. The novelty of this paper is in the extensive use of model-based control methodologies to simultaneously compute the capacity requests necessary to access the network (BoD) and the capacity allocations required to regulate the rates of the traffic flows (congestion control). The proposed scheme allows one to compute upper-bounds of the queue lengths in all the network buffers (thus allowing proper buffer dimensioning and, therefore, overflow prevention), avoids that the assigned capacity is left unused (thus entailing full link utilization) and guarantees the recovery of a satisfactory traffic behaviour as soon as congestion situations terminate (congestion recovery). The high-speed WLAN considered in the paper has been developed within the European Union (EU) project Wireless Indoor Flexible High Bitrate Modern Architecture (WINDFLEX). Extensive simulations prove the effectiveness of the proposed scheme.

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