Abstract: A method and a cellular wireless access data offload system (CWADOS) implemented in a base station of a cellular wireless communication network, for offloading data from a first cellular wireless communication interface (FCWCI) to a second wireless communication interface (SWCI) without impacting cellular wireless protocols of the cellular wireless communication network are provided. The CWADOS transmits wireless connection identification information to a user device for establishing the SWCI between the user device and a wireless access point, determines the FCWCI or the SWCI for transmitting downlink data packets from a core network to the user device and for transmitting uplink data packets from the user device to the core network based on switching criteria, forwards the downlink data packets to the user device via the FCWCI or the SWCI, and forwards the uplink data packets received from the user device via the FCWCI or the SWCI to the core network.