Patent ID: 7133390
Filing Date: 2006-11-07
Classification: H04B,H04M

Abstract:
1. A method for logging-on a mobile unit at a fixed station, the method comprising the steps of: selecting, at the fixed station, a sequence in which a plurality of carrier frequencies are changed from one time period to the next when communicating with the fixed station; transmitting data from the fixed station, wherein the data comprises check data, said check data comprising identification of the selected sequence and a time slot position of a specific carrier frequency being used by the fixed station during the step of transmitting; determining, via the mobile unit, the specific carrier frequency being used by the fixed station when the data was transmitted; determining, via the mobile unit, the selected sequence in which the plurality of carrier frequencies are changed from one time period to the next, using the transmitted check data; determining, via the mobile unit, the time slot position of the specific carrier frequency relative to the selected sequence, using the transmitted check data; determining, via the mobile unit, a subsequent carrier frequency used in a subsequent time period relative to the time slot position of the specific carrier frequency, using the check data; and changing to the subsequent carrier frequency, via both the mobile unit and the fixed station, after a predetermined time period in accordance with the selected sequence.