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This paper considers a communication network comprised of two nodes, which have no mutual direct communication links, communicating two-way with the aid of a common Relay Node (RN), also known as separated Two-Way Relay (TWR) channel. The authors first recall a cut-set outer bound for the set of rates in the context of this network topology assuming full-duplex transmission capabilities. Then, they derive a new achievable rate region based on Hash-and-Forward (HF) relaying where the RN does not attempt to decode but instead hashes its received signal, and show that under certain channel conditions it coincides with Shannon's inner-bound for the two-way channel.
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