Before revision:  A necessary condition for the validity of this approach in the asymptotic sense (when the number of wireless nodes tends to infinity) is the existence and uniqueness of a solution to a fixed point equation .
After revision:  A necessary condition for the validity of this approach in the asymptotic sense (when the number of wireless nodes tends to infinity) , but, contrary to widespread belief, may not necessarily hold in stationary regime. The issue is often related with the existence and uniqueness of a solution to a fixed point equation .