Patent ID: 6928286

Claim:
A frequency-synchronizing method in a wireless communications system, which comprises: communicating between a mobile unit and a stationary base station over a defined number of frequencies; transmitting a message containing a code identifying the base station during a time slot within a time frame; deriving a key from the identification code; specifying a defined number of different, unique frequency sequences each containing all the frequencies of the defined number of frequencies; setting the defined number of different, unique frequency sequences to be 40 frequency sequences, and calculating the frequency sequence with the following algorithm: f x+1 =mod(75[f x +Y]); Y=1, 2, 4, 7, 8, 11, 13, 14, 16, . . . , 68, 71, 73, 74; wherein f x is a frequency in the frequency sequence; assigning one of the frequency sequences to the key and selecting the one frequency sequence with the key; and consecutively changing to the frequencies contained in the assigned frequency sequence in the defined sequence by the base station and the associated mobile unit.