Patent ID: 6728529
Filing Date: 2004-04-27
Classification: H04L,H04W

Abstract:
A method for determining a start value to be stored in a memory of a wireless communications device, the start value being x bits in size and used to provide an initial value to an n-bit security count value, the wireless communications device capable of establishing a plurality of channels and capable of releasing established channels, the method comprising:for at least two channels established by the wireless communications device, obtaining a corresponding terminal value, the terminal value of the corresponding channel being the highest value reached by the x most significant bits (MSBx) of an n-bit security count value associated with the channel; obtaining a final value that is the greatest value of all the terminal values; and storing a start value in the memory of the wireless device that is at least as large as the final value only when storage of the start value is prompted by a new channel being established, by an established channel being updated, or by an established channel being released.