Fig. 8
From: N-DCF: MAC overhead reduction using narrow channel contention in wireless networks
Structure of compound radio used to implement the proposed scheme. A MAC-PHY pair operates for each narrow channel. Each MAC runs 802.11 DCF, but does not have its own packet queue. Instead, when the channel access is granted, the MAC dequeues a packet from the shared packet queue and transmits the packet. Neighboring MACs are connected so that when a node successfully receives an ACK, the MAC of channel i can signal the MAC of channel i+1 to perform privileged access