Patent 7664265 was granted and assigned to Nokia on February, 2010 by the United States Patent and Trademark Office.
The present invention relates to relocation of the control of communication between a first station and a second station from a first communication system controller to a second communication system controller. The communication is ciphered by means of a first ciphering key. In the method, after the initiation of the relocation of control of the communication from the first controller to the second controller a request for relocation is transmitted to the second controller. The request contains the first ciphering key and at least one other ciphering key.