Embodiments may include methods, systems, and apparatuses for integrating a first radio access technology and a second radio access technology in a wireless transmit/receive unit (WTRU). The embodiments may include: gathering, by the WTRU, one or more metrics related to uplink/downlink transmissions; determining, based on the one or more metrics, that an amount of data from the first radio access technology should be offloaded to the second radio access technology; transmitting a first portion of the data to a base station using the first radio access technology; and transmitting a second portion of the data to a wireless local access network (WLAN) access point (AP) using the second radio access technology, wherein the WLAN AP is connected to the base station through an interface.