Patent ID: 9554347
Date: 2017-01-24
CPC Classifications: H04W

Claim:
1. A method for use in a radio equipment node (RE) connected to a radio equipment control node (REC) for measuring end-to-end processing delay of the RE between an input interface and a transmit port in the downlink direction and a receive port and an output interface on the uplink direction, comprising: a. activating downlink and uplink radio channels at a predetermined carrier frequency; b. adding at said input interface and said receive port, a chirp sine wave to the activated radio channels such that the chirp sine wave becomes mixed with the carrier frequency; c. sampling at the transmit port a received downlink mixed signal and at the output interface a received uplink mixed signal; d. cross-correlating the sampled mixed signals with a reference chirped sine wave to obtain a signal phase shift; and e. converting the phase shift obtained from the cross-correlating step to a time delay associated with the end-to-end processing delay of said RE.