Patent ID: 9692565
Date: 2017-06-27
CPC Classifications: H03J,H04L

Claim:
1. An automatic frequency calibration method of a small cell, wherein the automatic frequency calibration method comprises: receiving a set of at least one broadcasting message in a surrounding environment; determining whether part of the at least one broadcasting message is transmitted from at least one first type base station, wherein a signal coverage of the first type base station is larger than a signal coverage of the small cell; when part of the at least one broadcasting message is transmitted from the first type base station, calibrating a frequency of the small cell according to one of the at least one first type base station whose signal strength is maximum among all of the at least one first type base station; and when all of the at least one broadcasting message are not transmitted from the first type base station, calibrating the frequency of the small cell according to an average frequency offset of at least two reference base stations which are selected from at least two second type base stations, wherein a signal coverage of each of the second type base stations is smaller than the signal coverage of the first type base station.