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We present our current work-in-progress on the design and implementation of ahybrid TDMA/CSMA medium access architecture, hereafter referred to as hMAC,which can be used on top of commercial IEEE 802.11 off-the-shelf hardware. Thesoftware only solution is based on the popular Linux ATH9K softMAC driver andhence can be used with standard Linux systems using Atheros based wirelessnetwork devices. The proposed hMAC exploits the standard 802.11 power savingfunctionality present in the ATH9K device driver to enable control of thesoftware packet queues. This allows the assignment of TDMA time slots onwireless link and traffic class basis. While the solution is placed only in thedevice driver, the CSMA/CA functionality on hardware level is still active.This enables inter-working with standard unmodified 802.11 devices. We testedour prototypical hMAC implementation in a small test-bed. Therefore, weimplemented a centralized interference management scheme in which pairs oflinks suffering from a hidden node problem are assigned to TDMA time slots on aper-link basis. To show the benefits of the proposed hMAC approach we comparedthe results with standard 802.11 DCF and classical, i.e. per-node, TDMA.Finally, to enable collaboration with the research community, the hMAC sourcecode is provided as open-source.

hMAC: Enabling Hybrid TDMA/CSMA on IEEE 802.11 Hardware