There have been tremendous advances over the past decades when it comes to wireless access technologies. Nowadays, several wireless access technologies are available everywhere. Even mobile devices have evolved to support multiple access technologies (e.g., 3G, 4G or WiFi) in providing the best possible access to the Internet. However, all of these devices can communicate using only one access technology at a time. It is foreseen that an integration of these access technologies to offer users a network access through multiple simultaneous connections would be beneficial for both end users and the mobile network operators. This paper investigates how to tackle the simultaneous usage of multiple wireless access technologies in the downlink. For this purpose, a practical example of heterogeneous network is considered where 3GPP LTE and non-3GPP WLAN access technologies are integrated together. Furthermore, a novel decision mechanism is proposed, that focuses on optimizing the network resource management based on a mathematical formulation of the system. The mathematical model is implemented using the Linear Programming techniques. The paper demonstrates the gains that are achieved from using such innovative decision mechanism as well as the benefits that arise from the simultaneous usage of multiple wireless heterogeneous accesses. Keywords— LTE and WLAN interworking, User QoE optimization, Linear programming, Access link modeling, Heuristic methods
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