Suppose there is a mobile device at the edge of a cell of a 5G wireless network which has a weak channel with the base station. The edge user can utilize relay assisted D2D communications proposed for 5G. Assume the edge user broadcast a call and expect it to reach at least one neighboring relay. How can the reliability of the broadcast call reaching at least one neighboring relay be mathematically modeled for 5G by taking 3GPP standards into consideration?