APPARATUS AND METHOD FOR DELAY TIME COMPUTATION AND DELAY COMPENSATION BETWEEN BASE STATION AND REMOTE RADIO FREQUENCY UNIT IN BROADBAND WIRELESS ACCESS SYSTEM
First Claim
1. 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.
1 Assignment
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Accused Products
Abstract
An apparatus and method for delay time computation and delay compensation between a Base Station (BS) and a remote Radio Frequency (RF) unit in a broadband wireless access system are provided. In a method of operating an apparatus for determining a delay time to compensate for delay between a BS modem card and a remote RF unit in a wireless access system, the method includes 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.
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Citations
22 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus 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 apparatus comprising:
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a signal delay computation unit for 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; a first pulse difference counter for 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 a modem, included in the BS modem card, for determining a time for outputting traffic data at an earlier time from the modem included in the BS modem card by using the determined process delay time and cable delay time. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification