Estimating frequency error with beacon transmissions

Abstract

Estimation of frequency error is disclosed through use of beacon or preamble transmissions. A base station transmits one or more preamble tones at predetermined frequencies using all allocated transmission power associated with the transmission bandwidth for the one or more preamble tones. The base station then transmits its synchronization signals. A UE collects a set of samples from the received transmissions waveform and successively transforms the samples to a frequency domain. The UE may then detect the preamble tones as having at least a threshold power relative to other samples in the transformed samples. The frequency error may then be set as the difference between the detected frequency or frequencies of the received preamble tones and the known predetermined transmission frequency.

Dependencies are inferred from the claim text.