This paper presents G-DCF, a MAC protocol for wireless LANs that can improve system spectral efficiency of wireless LANs by\nallowing more concurrent transmissions. The 802.11 DCF creates exposed terminals which are nodes that can transmit successfully\nbut are blocked by carrier sensing. More potential exposed terminals are created when APs are densely placed, limiting\nspatial reuse of channels and thus system throughput. In order to allow concurrent transmissions from exposed terminals, G-DCF\nestablishes groups in the network. Members of a group are nodes located within the carrier sense range of each other but can\ntransmit packets concurrently. Whenever one member of a group wins the channel and transmits its packet, other nodes in the\ngroup also start transmission, triggered by the group ID included in the preamble. Contention window is adjusted according to the\ngroup size for fair share of the channel. Performance evaluations show that G-DCF can significantly improve system throughput\nand fairness over 802.11 DCF, especially when the APs are densely deployed.
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