Dense small-cell networks: Rethinking the radio interface beyond LTE-advanced

In this article, we provide an overview of the 5GETLA radio interface proposal for low latency dense small-cell networks. We discuss the new physical layer parametrization and frame design to support high energy and spectral efficiency in wireless small-cell communications and compare the main parameters with another recent physical layer design proposed for 5G centimeter wave communications. The challenges and potential of the design proposals are opened and discussed. The main emphasis in these designs is to go beyond LTE-Advanced to achieve 5G design targets, while leaving room for further innovations.