The existing IEEE and 3GPP standards have laid the foundation for integrating cellular and WiFi network to deliver a seamless\nexperience for the end-users when roaming across multiple access networks. However, in recent studies, the issue of making\nroaming decision and intelligently selecting the most preferable Point of Service to optimize network resource and improve end\nuser�s experience has not been considered properly. In this paper, we propose a novel cellular and WiFi roaming decision and\nAP selection scheme based on state of the art, 3GPP TS24.312 and IEEE 802.11u, k standards. Our proposed scheme assists the\nmobile nodes to decide the right timing to make roaming decision and select preferable point of service based on the operator�s\npolicies and real-time network condition. We also introduce our simulation model of a heterogeneous network with cellular and\nWiFi interworking as well as 3GPP ANDSF, TS24.312. It is a complete end-to-end system model from application to physical layer\nwith considering user�s mobility and realistic traffic model. The proposed scheme outperformed the conventional WiFi selection\nscheme in terms of dynamically steering mobile node�s data traffic frommacrocell to available Access Points. The proposed scheme\nincreased the utilization and balanced the traffic load of access points and improved user�s experienced throughput.
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