  While highly directional communications may offer considerable improvements
in the link data rate and over-the-air latency of high-end wearable devices,
the system-level capacity trade-offs call for separate studies with respect to
the employed multiple access procedures and the network dynamics in general.
This letter proposes a framework for estimating the system-level area
throughput in dynamic distributed networks of highly-directional paired
devices. We provide numerical expressions for the steady-state distribution of
the number of actively communicating pairs and the probability of successful
session initialization as well as derive the corresponding closed-form
approximation for dense deployments.
