A method in a communication system comprising at least one access network
controller entity for controlling a plurality of service areas and a core
network controller entity. The access network controller entity reports
to the core network controller entity movement of a user equipment from a
first service area to a second service area. The report contains
indication that the user equipment has moved to be served within the
second service area. The report contains also information regarding the
volume of data that was not communicated between the user equipment and
communication means of the first service area while the user equipment
was served within the first service area.