IEEE 802.21: Media-Independent Handover Services
The IEEE 802.21 working group (see www.ieee802.org/21) recently finalized the first standard for dealing with handovers in heterogeneous networks, also called Media-Independent Handovers (MIH). The standard is expected to allow mobile users (and operators) to take full advantage of overlapping and diverse access networks. It provides a framework for efficiently discovering networks in range and executing intelligent heterogeneous handovers, based on their respective capabilities and current link conditions.
An interesting primer about this can be found on the last issue of “The Internet Protocol Journal”.