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Cellular networks are evolving towards dense deployment of small cells. Thisin turn demands flexible and efficient backhauling solutions. A viable solutionthat reuses the same spectrum is wireless backhaul where the Small Base Station(SBS) acts as a relay. In this paper we consider a reference system that useswired backhaul and each Mobile Station (MS) in the small cell has its uplinkand downlink rates defined. The central question is: if we remove the wiredbackhaul, how much extra power should the wireless backhaul use in order tosupport the same uplink/downlink rates? We introduce the idea ofwireless-emulated wire (WEW), based on two-way relaying and network coding.Furthermore, in a scenario where two SBSs are served simultaneously, WEW givesrise to new communication strategies, partially inspired by the private/publicmessages from the Han-Kobayashi scheme for interference channel. We formulateand solve the associated optimization problems. The proposed approach providesa convincing argument that two-way communication is the proper context todesign and optimize wireless backhauling solutions.

Using Wireless Network Coding to Replace a Wired with Wireless Backhaul