Integrity of pilot phase offset measurements for predicting pilot strength
AssigneeDenso Corporation
InventorJason F. Hunzinger
Life of this patent
Estimating the term…
Abstract
A high integrity process is provided to apply pilot phase rates to call processing decisions. An estimate or measurement of the rate of change of a pilot's PN phase offset is used to assist in making CDMA call processing decisions. The phase rate is a measure of the rate of change of a pilot's PN phase offset relative to a mobile time reference and is directly related to the multipath environment and movement of the mobile. Both an integrity algorithm to compute an integrity indicator and a technique to apply the integrity indicator to predict future pilot strengths are included.
Claims17
A method of making a call processing decisions comprising:
- receiving a pilot energy and a phase rate;
- calculating the derivative of the pilot energy;
- determining a ratio of the derivative of the energy to the phase rate;
- generating an integrity factor based on the ratio;
- predicting a future pilot strength based on the integrity factor;
- and
- using the future pilot strength to assist in making the call processing decisions.
A pilot energy predictor comprising:
- an integrity calculator which receives a phase rate and a pilot energy as inputs and determines a ratio of the derivative of the pilot energy to the phase rate and generates an integrity factor based on the ratio.
A method of predicting a short term pilot strength comprising:
- determining an amount of time to predict the pilot strength;
- determining the predicted rate of change in the short term pilot strength;
- and
- calculating the change in short term pilot strength by multiplying the predicted rate of change by the amount of time to predict the pilot strength.
Dependencies are inferred from the claim text.