Method and apparatus of network traffic offloading is disclosed. Network traffic offloading method may include receiving a first network traffic offloading frame from a base station in a cellular network, the first network traffic offloading frame comprising a frame type instructing a scanning start by broadcasting an advertising frame, traffic information indicating traffic expected to be offloaded by the base station and a transmission configuration indicating a period and a duration to transmit the advertising frame, broadcasting the advertising frame based on the transmission configuration to scan at least one access point (AP), receiving at least one invitation frame from the at least one AP and transmitting a probe request frame to an AP selected among the at least one AP to associate with the selected AP.