  Full-duplex (FD) technique can remarkably boost the network capacity in the
millimeter wave (mmWave) bands by enabling simultaneous transmission and
reception. However, due to directional transmission and large bandwidth, the
throughput and fairness performance of a mmWave FD network are affected by
deafness and directional hidden-node (HN) problems and severe residual
self-interference (RSI). To address these challenges, this paper proposes a
directional FD medium access control protocol, named DFDMAC to support typical
directional FD transmission modes by exploiting FD to transmit control frames
to reduce signaling overhead. Furthermore, a novel busy-tone mechanism is
designed to avoid deafness and directional HN problems and improve the fairness
of channel access. To reduce the impact of RSI on link throughput, we formulate
a throughput maximization problem for different FD transmission modes and
propose a power control algorithm to obtain the optimal transmit power.
Simulation results show that the proposed DFDMAC can improve the network
throughput and fairness by over 60% and 32%, respectively, compared with the
existing MAC protocol in IEEE 802.11ay. Moreover, the proposed power control
algorithm can effectively enhance the network throughput.

Networking and Internet Architecture