Patent ID: 8363563

Claim:
A method for determining a delay time to compensate for delay between a Base Station (BS) modem card and a remote Radio Frequency (RF) unit in a wireless access system, the method comprising: determining a process delay time required when traffic data is output from the BS modem card to an antenna of the remote RF unit in a state where a reference cable having a length short enough to neglect a cable delay time is connected between the BS modem card and the remote RF unit; determining a cable delay time required when a sync pulse signal is transmitted through a cable used in actual system operation between the BS modem card and the remote RF unit; and determining a time for outputting traffic data at an earlier time from a modem included in the BS modem card by using the determined process delay time and cable delay time, wherein the determining of the cable delay time comprises: determining a default offset time required when the sync pulse signal returns to the BS modem card via the remote RF unit from the BS modem card in a state where the reference cable having a length short enough to neglect the cable delay time is connected between the BS modem card and the remote RF unit; and determining a delay time required when the sync pulse signal returns to the BS modem card via the remote RF unit from the BS modem card in a state where the cable used in actual system operation is connected between the BS modem card and the remote RF unit.