Patent ID: 6968200
Filing Date: 2005-11-22
Classification: H04W

Abstract:
1. A method for setting an initial hyper frame number (HFN) for a new radio bearer in a wireless communication system, the wireless communication system comprising: a mobile unit maintaining a status variable capable of assuming a NOT STARTED state indicating that a ciphering is not to be performed along the new radio bearer, and a STARTED state that indicates that the ciphering is to be performed along the new radio bearer; a universal terrestrial radio access network (UTRAN) for transmitting a first control command to the mobile unit, the first control command used for triggering establishment of the new radio bearer between the mobile unit and the UTRAN; and a plurality of established radio bearers, each established radio bearer between the mobile unit and the UTRAN having a corresponding first HFN; the method comprising: the UTRAN sending the first control command to the mobile unit to establish the new radio bearer; in response to receiving the first control command, the mobile unit generating a first value based on the first HFNs of the established radio bearers, the first value being at least as great as the x most significant bits (MSB in response to receiving the first control command, the mobile unit setting the MSB