http://www.rfc-editor.org/rfc/rfc7077.txt
RFC 7077: Update Notifications for Proxy Mobile IPv6, S. Krishnan, S. Gundavelli, M. Liebsch, H. Yokota, J. Korhonen2013-11-01T23:00:00-00:00This document specifies protocol enhancements for allowing the local mobility anchor in a Proxy Mobile IPv6 domain to asynchronously notify the mobile access gateway about changes related to a mobility session. These Update Notification messages are exchanged using a new Mobility Header message type specifically designed for this purpose.