Patent ID: 8903345

Claim:
A method of non-linear frequency control tracking of a control loop of a voltage controlled oscillator (VCO) in a wireless mobile device receiver, the method comprising: receiving one or more channel quality indicators for a received radio frequency channel from the wireless mobile device receiver, the one or more channel quality indicators selected from a group comprising a signal-to-noise ratio of the received channel, bit-error rate of the received channel, a received signal strength measurements, and carrier-to-interference-plus-noise ratios (C/I+N); determining a channel metric based on the received one or more channel quality indicators; determining a state metric associated with the current operating state of the control loop; determining one or more state metric threshold values associated with the determined channel metric, the determined one or more state metric threshold values selected from a plurality of groups of one or more state metric threshold values, each of the determined one or more state metric threshold values associated with a transition to a possible operating state of the control loop, from the current operating state; determining if one of the one or more state metric threshold values has been exceeded based upon the determined state metric, wherein the state metric threshold values is defined for each transition between each of operating states; transitioning from the current operating state of the control loop to the operating state associated with the exceeded state metric threshold value; and providing at least one coefficient to an adaptive loop filter of the control loop, the at least one coefficient associated with the transitioned operating state; wherein the state metric threshold values associated with the operating states provide overlapping region between common operating states to provide hysteresis for operating state transitions.