Apparatus amd method of ciphering in wireless...

Details Apparatus amd method of ciphering in wireless... Apparatus amd method of ciphering in wireless...

H - Electricity

04

W

H04W 12/02 (2009.01) H04W 36/32 (2009.01)

Patent

CA 2672061

A method in a wireless telecommunications device operative with a plurality of radio access networks, the method comprising: when operating with a first radio access network (e.g. GSM) reading at least one ciphering variable applicable in the second radio access network (e.g. in UMTS reading the value of a variable START from the USIM of the device). When the at least one ciphering variable applicable in the second radio access network renders ciphering in the second radio access network infeasible without further authentication (e.g. in UMTS when the value of START in USIM is equal to a value THRESHOLD), using a substitute value for the ciphering parameter (e.g. START) when establishing a connection with the second radio access network.

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