The 2D active antenna array includes a number N antenna elements.

The passive antenna array of the existing base station is replaced with an active antenna array, consisting of an active radiator unit that includes an array of both receive and transmit antenna elements.

Some embodiments of the method include generating mapping information that relates at least one first requirement associated with an active antenna array to at least one second requirement associated with the active antenna array.

The subscriber station also includes processing circuitry configured receives physical downlink shared channels (PDSCHs) from a 2D active antenna array at the at least one base station.