Patent ID: 9736684
Date: 2017-08-15
CPC Classifications: H04L,H04W

Claim:
1. A method for determining mismatch of ciphering parameters in a wireless device, the method comprising: examining a predefined ciphered field in one or more received Radio Link Control (RLC) layers in Protocol Data Units (PDUs) including examining if data in the predefined ciphered field of the PDU points to invalid positions lying beyond an end of the PDU to determine if the field is invalid; determining when the predefined ciphered field is invalid over a predetermined sample number of PDUs; determining a parameter mismatch of ciphering parameters when a predetermined number of samples of the predefined ciphered field that are determined as invalid exceed a predetermined threshold; buffering the one or more received RLC PDUs whenever the field is determined to be invalid during sampling over the predetermined sample number of PDUs; and recovering the buffered one or more PDUs after determining mismatch of the ciphering parameter, wherein recovering the buffered one or more PDUs further comprises scanning Hyper-Frame numbers (HFNs) over a window of HFNs for the buffered one or more received PDUs when the parameter mismatch is determined.