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Pushing data traffic from cellular to Wi-Fi 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 but tractable model that consists of M different RATs, each deploying up to K different classes of Access Points (APs), where each class differs in transmit power, path loss exponent, deployment density and effective bandwidth. Each class of APs is modeled as an independent Poisson Point Process (PPP), with mobile user locations modeled as a further independent PPP, all channels further consisting of i.i.d. Rayleigh fading.
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