Recommendation ITU-T Y.2018 specifies the architecture and functional requirements for the management of logical location information, as defined in Recommendation ITU-T Q.1707 and control of mobility in the NGN transport stratum. It addresses all types of device mobility as defined in Recommendation ITU-T Q.1706. It draws heavily from Recommendations ITU-T Q.1707, ITU-T Q.1709, and ITU-T Q.1708, but maps their content into the framework provided by Recommendation ITU-T Y.2012.