On Two Unicast Wireless Networks with Destination-to-Source Feedback

In this paper we study the role of feedback in layered two unicast wireless networks with arbitrary number of nodes and connectivity. The feedback model allows destinations to feedback their received signals to their respective sources. In the case of linear deterministic networks, we fully characterize the capacity region when the two individual minimum cut values are equal to 1 and show that feedback only helps increase capacity whenever the capacity region without feedback has (1, 1/2) or (1/2, 1) as its corner point but not both. Therefore, feedback helps balance the resource utilization of the two users, similar to the role of feedback in the two-user interference channel [1].