In accordance with an example embodiment of the present invention, an apparatus comprising: at least one processor; and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform at least the following: detect that a mode change is required; and in response to the detection that a mode change is required, select a mode for resource allocation, wherein the mode is selected based on a command received by the apparatus or the mode is selected from a plurality of modes which comprises a first mode and a second mode, and wherein in the first mode the cellular communication and device to device communication are separated in time, and in the second mode the cellular communication and device to device communication take place simultaneously.