US Patent 11153791 Full and delta configuration in a central unit-distributed unit architecture

This document describes methods, devices, systems, and means for determining configurations for the exchange of configuration information during network role transitions, such as a secondary node change or a handover. A secondary base station (123) node includes a central unit (CU) (410) and one or more distributed units (DU) (420). The secondary base station node is configured to receive an addition request message including configuration information and, based on the received configuration information, determine, at the CU (410) of the secondary base station (123), whether to apply a full configuration or a delta configuration. The CU (410) generates secondary cell group information, based on cell group configuration information received from the one or more DUs (420), and send an addition response message, including the generated secondary cell group information, to a master base station (122).