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Vertical Handoff (VHO) is a crucial mechanism for the architecture of the Fourth Generation (4G) Heterogeneous Wireless Networks (HWN), because the users of 4G-HWN are capable of switching to any network in a seamless manner. These algorithms need to be practical and true to a wide range of applications hence utilization of an application layer parameter is important to decide the handoff and admission control. As a noticeable number of OSN users increased among smart phones, this study proposes a deployment of social context incorporated with vertical handoff and admission control algorithms called VHO-AC for the 4G-HWN environment. Admission of a node is decided based on the Graph Centrality Theory, which is contributing their measures to design an application layer parameter called Social Centrality Measure (SCM). The simulation results show that social network traffic flowing out of 2G and 3G base stations is much reduced than the existing SCVH method.

Vertical Handoff and Admission Control Strategy in 4G Wireless Network Using Centrality Graph Theory