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1. Estimating the Available Medium Access Bandwidth of IEEE 802.11 Ad Hoc
Networks with Concurrent Transmissions
Concurrent transmission scheduling mechanisms can significantly improve the total throughput
of IEEE 802.11 ad hoc networks. What remains unaddressed, however, is how to estimate the
available medium access bandwidth (AB) of a link under concurrent transmission scenarios, i.e.,
the maximum throughput that can be obtained without violating the quality-of-service (QoS)
requirements of the existing flows. In this paper, we focus on estimating the available medium
AB of IEEE 802.11 ad hoc networks with the control-gap-based concurrent transmissions. We
first introduce the upper bound of the AB of a link, and then, we present an algorithm to estimate
the available transmission/reception duration of the node by a distributed manner. We further
derive a preliminary estimation of the AB by analyzing the nonoverlap between the medium
availability of the sender and recipient of a link. Finally, we refine the estimation by taking into
account the transmission failures induced by hidden nodes and concurrent collisions. Extensive
simulations demonstrate the accuracy of the proposed approach.