Institute of Electrical & Electronic Engineers
Pushing data traffic from cellular to WiFi is an example of inter Radio Access Technology (RAT) offloading. While this clearly alleviates congestion on the over-loaded cellular network, the ultimate potential of such offloading and its effect on overall system performance is not well understood. To address this, the authors develop a general and tractable model that consists of M different RATs, each deploying up to K different tiers of Access Points (APs), where each tier differs in transmit power, path loss exponent, deployment density and bandwidth. Each class of APs is modeled as an independent Poisson Point Process (PPP), with mobile user locations modeled as another independent PPP, all channels further consisting of i.i.d. Rayleigh fading.