Abstract
Medium access using the distributed coordination function of IEEE 802.11 is not efficient in wireless multihop networks if the devices are equipped with beamforming antennas. This paper proposes a distributed MAC protocol that goes completely away from the spatial reservation scheme of 802.11. It facilitates the use of beamforming antennas by following an announcement-objection scheme: a potential sender must “simulate” a transmission on a signaling channel before it can access the traffic channel. Based on this simulation, each receiving device estimates the expected interference and objects to the transmission if necessary. This paradigm overcomes the drawback of 802.11-based approaches that neighboring devices are silenced irrespective of whether or not they disturb signal reception. It benefits from a tight interaction of the MAC and physical layer.
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