Architectures for IP-based network-assisted mobility management across heterogeneous networks

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In this article new architectures for network- assisted management of vertical handovers are proposed, relying on IP-based protocols, aiming at achieving the most relevant intersystem mobility decision with respect to user satisfaction and operator added value. The key design principle used is ease of deployment, with flexible hierarchical handover decision entities allowing the distribution of the decision process across local and global levels. The decision itself relies on a broad set of parameters at the radio, networking, application, user preferences, and operator policies levels. The advantage of the approach is highlighted in the specific cellular/WLAN scenario, and a proof-of-concept testbed has enabled to validate it. Standardization in this area is currently ongoing in 3GPP, IEEE, and IETF.