Patent ID: 8036385
Filing Date: 2011-10-11
Classification: H04K,H04L,H04W

Abstract:
1. A method for applying ciphering in a user equipment device (UE) configurable for operation in a mobile telecommunications system comprising a network of a plurality of cells, the method comprising: receiving a wireless communication over a radio bearer (RB); selecting, from a plurality of ciphering configurations stored in the UE and based on the RB, a subset of the plurality of ciphering configurations that may be used on the wireless communication; determining, based on the RB and the wireless communication, which type of ciphering configuration to use on the wireless communication; using one ciphering configuration from the selected subset and of the determined type on the RB; and where the UE is configurable to periodically audit stored ciphering configurations by which to determine whether stored ciphering configurations are applicable based on sequence numbers of messages sent and received and to delete stored ciphering configurations deemed no longer applicable based on the audit and sequence numbers of messages sent and received over the RB in question.