Patent ID: 7899461

Claim:
A User Equipment (UE) device configured for use in a mobile telecommunications system, including a transmitter and receiver component configured to receive messages and transmit messages, the UE being arranged to: receive a Cell Update Confirm (CUC) message; determine whether there is an empty C_RNTI (Cell Radio Network Temporary Identifier) variable; when there is an empty C_RNTI (Cell Radio Network Temporary Identifier) variable, determine whether the received CUC message includes a C-RNTI (Cell Radio Network Temporary Identifier); when the CUC message does not include a C_RNTI (Cell Radio Network Temporary Identifier) and the CUC message would cause the UE to enter a state that requires the UE to transmit a respond message before entering the state, setting INVALID_CONFIGURATION to TRUE prior to entering the state.