  In this paper we study the relay-interference wireless network, in which
relay (helper) nodes are to facilitate competing information flows over a
wireless network. We examine this in the context of a deterministic wireless
interaction model, which eliminates the channel noise and focuses on the signal
interactions. Using this model, we show that almost all the known schemes such
as interference suppression, interference alignment and interference separation
are necessary for relay-interference networks. In addition, we discover a new
interference management technique, which we call interference neutralization,
which allows for over-the-air interference removal, without the transmitters
having complete access the interfering signals. We show that interference
separation, suppression, and neutralization arise in a fundamental manner,
since we show complete characterizations for special configurations of the
relay-interference network.
