Methods and Arrangements in a Mobile Telecommunication System

摘要

Methods and arrangements in a base station and a User Equipment are provided. The methods and arrangements relates to the scenario when the UE is 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 in the UE comprises receiving (501) a configuration message from the target base station via the source base station, configuring (502) the UE based on the received configuration message from the target base station by searching (503) for a second field in an information element of the received configuration message. 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.

主权项

1. A method in a base station for configuring a user equipment, UE, in a handover scenario, when the UE is handed over from a source base station to the base station and wherein the base station does not support at least one functionality which the source base station and the UE support, the method comprises:
receiving (401) from the source base station a handover, HO, request message comprising at least a first field associated with a first functionality not supported by the base station, decoding (402) at least a portion of the received HO request message, composing (403) a reconfiguration message to be used to configure the UE to be handed over to the base station, wherein the composing (403) comprises:
omitting (404) insertion of the at least the first field, and inserting (405) a second field, the second field being indicative of how the UE should be configured in relation to the first functionality, and sending (406) the composed reconfiguration message to the UE via the source base station.