Systems and methods for dynamic temperature calibration of a frequency reference

摘要

A system and method are described for dynamic temperature calibration of a frequency reference in a wireless base station. In a consumer grade base station, a reference oscillator may encounter frequency drift as the temperature of the base station changes. This causes interference as the transmission signal is not synchronized with other frequency resources in a network. An improved method of calibrating a reference frequency includes measuring a frequency difference between a frequency derived from an accurate reference frequency in a first base station and a frequency derived from a less accurate frequency reference in a second base station, determining a calibration factor for the offset, and applying the calibration factor to the base station to correct frequency drift. The calibration factors may be correlated with an operating temperature of the base station and stored in a temperature calibration table in the base station device.

主权项

1. A system, comprising:
a first base station having a first frequency reference unit, a temperature sensor, and a memory having a calibration table stored therein; a second base station having a second frequency reference unit; and a network controller device configured to manage radio resources of the first and second base stations, the network controller device configured to receive frequency information from a subscriber device, the frequency information being based on a first measurement of a first transmit frequency of the first base station and a second measurement of a second transmit frequency of the second base station, wherein the first base station is configured to: receive reference correction feedback from the network controller device, the reference correction feedback being based on the frequency information received from the subscriber device; measure a first operating temperature with the temperature sensor; update the calibration table using data associated with the reference correction feedback and calibration table data associated with the first operating temperature; and correct the first frequency reference unit of the first base station using the updated calibration table.