Patent ID: 8767710

Claim:
A remote radio head (RRH) for a wireless communication system base station, wherein the RRH is communicably coupled to a baseband unit (BBU) of the wireless communication system base station through a network, and wherein the BBU processes and transmits downlink data to the RRH, the RRH comprising: a time-delay measurement unit for measuring a time-delay for the downlink data to arrive at the RRH from the BBU; a time-delay notification unit for notifying from the RRH to the BBU of time-delay data on the time-delay measured by the time-delay measurement unit; wherein the time-delay data is used to advance the starting time for the BBU to process and transmit the downlink data by an amount of time obtained based on the time-delay data; a digital to analog (D/A) converter for transmitting the downlink data to a wireless communication device; wherein the time-delay measurement unit comprises a frame header time-delay measurement means for measuring a first time difference T d1 between the time when the D/A converter begins to transmit the downlink data to the wireless communication device and the time when a first data sample of a data frame of the downlink data arrives at the RRH, wherein the time-delay data comprises the first time difference T d1 ; a downlink unit for receiving downlink data from the BBU; and a pulse generator for generating a downlink pulse T DL for triggering the D/A converter to transmit downlink data to the wireless communication device; wherein the frame header time-delay measurement means comprises means for measuring the first time difference T d1 between the time when the downlink pulse T DL is generated and the time when the first data sample of the downlink frame from the BBU arrives at the downlink unit.