Methods and Arrangements in a Mobile Telecommunication System

A method in a user equipment, UE, configured to be handed over from a source base station to a target base station in a handover scenario, and wherein the target base station may not support functionalities which the source base station and the UE support, the method comprises:

• receiving a configuration message from the target base station via the source base station,
• configuring the UE based on the received configuration message from the target base station by
• searching for a second field in an information element of the received configuration message, wherein the presence/non-presence or a value of the second field is indicative of how to manage a configured first functionality associated with an optional first field, wherein the configured first functionality may not be supported by the target base station.

A user equipment, UE, configured to be handed over from a source base station to a target base station in a handover scenario, and wherein the target base station may not support functions which the source base station and the UE support, the UE comprises:

• a receiver configured to receive a configuration message from the target base station via the source base station,
• a processor configured to search for a second field in an information element of the received configuration message, wherein the presence/non-presence or a value of the second field is indicative of how to manage a configured first functionality associated with an optional first field, wherein the configured first functionality may not be supported by the target base station.