Patent ID: 6560215
Filing Date: 2003-05-06
Classification: H04W

Abstract:
An apparatus for updating a timing offset for stored events scheduled in an event generator in a radio communication system including at least one base station and a mobile device, the apparatus comprising:a timing detector for converting a reference clock to a sub-symbol reference frame clock and measuring a timing change in a timing difference between the reference frame clock in the mobile device and a channel clock transmitted by the at least one base station; a timing update controller coupled to a call processor of the mobile device; a timing offset register coupled to the update timing controller, the timing detector and the event generator; and an update mode selector coupled to the timing update controller and the timing offset register, wherein the update mode selector distinguishes between a timing change less than one clock tick between the mobile unit and a base station, such as when a distance changes therebetween within a call, and a timing change greater than one clock tick between the mobile unit and a base station, such as when the mobile unit moves between cells and base stations, wherein: when the timing detector and update mode selector indicate a timing change greater than one sub-symbol clock tick, the timing detector adds the timing change to the existing timing offset in the offset register to be read into the event generator without interrupting execution of the stored events, such that clock synchronization is restored between the mobile unit and the base station.