User Cooperation with Interference Forwarding in a Cellular System

This paper proposes a user cooperation scheme to improve the achievable rate of a cell edge user in a two cell model. In the proposed user cooperation, one user helps decoding of the other user by either desired signal forwarding (SF) or interference forwarding (IF). We derive an achievable rate region of the proposed user cooperation and compare it with that of a conventional two-cell system without user cooperation. It is shown that the proposed user cooperation exploiting either SF or IF is beneficial in terms of achievable rate region compared to the conventional two-cell system.