A method, in a wireless communications device, for transitioning between communication states, the wireless communications device compliant for use in a Universal Mobile Telecommunications System (UMTS), the method comprising: checking for radio bearer mapping information for the communication state being transitioned to prior to sending an update message, where the transition between communication states is not a transition from a paging state to a bidirectional communication state using shared channels; and transitioning to the state to be transitioned to using the checked radio bearer mapping information for that state and sending the update message.

 
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> RADIO COMMUNICATION APPARATUS AND RADIO COMMUNICATION METHOD

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