Apparatus and method for measuring and compensating delay between main base station and remote base station interconnected by an optical cable
First Claim
1. An apparatus for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the apparatus comprising:
- an SDH processing unit for inserting a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station and for receiving the SDH frame looped back by the remote base station to detect at least one frame alignment word (FAW) from the SDH frame of the remote base station;
a controller for producing a value of propagation delay between the main base station and the remote base station by adding propagation delay measured according to a count value of round trip delay of the SDH frame containing the test pattern to a delay error calculated from detection information of the FAW; and
a modulator and demodulator (MODEM) for compensating propagation delay of a baseband signal to be transmitted to the remote base station in response to the propagation delay value produced by the controller.
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Abstract
An apparatus and method for measuring and compensating for delay between a main base station and a remote base station interconnected by an optical cable. The main base station inserts a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station, receives the SDH frame looped back by the remote base station to detect the test pattern, and measures propagation delay according to the test pattern. At least one frame alignment word (FAW) is detected at a predetermined position in the received SDH frame, and a delay error is calculated according to FAW detection information. The measured propagation delay with the delay error is compensated and produces propagation delay caused by the optical cable. A modulator/demodulator (MODEM) compensates for delay of a baseband signal to be transmitted to the remote base station.
118 Citations
19 Claims
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1. An apparatus for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the apparatus comprising:
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an SDH processing unit for inserting a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station and for receiving the SDH frame looped back by the remote base station to detect at least one frame alignment word (FAW) from the SDH frame of the remote base station; a controller for producing a value of propagation delay between the main base station and the remote base station by adding propagation delay measured according to a count value of round trip delay of the SDH frame containing the test pattern to a delay error calculated from detection information of the FAW; and a modulator and demodulator (MODEM) for compensating propagation delay of a baseband signal to be transmitted to the remote base station in response to the propagation delay value produced by the controller. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the apparatus comprising:
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a controller for receiving propagation delay information indicating a propagation delay value from the main base station through the optical cable; and a radio frequency (RF) processing unit for converting a baseband signal received from the main base station into an intermediate frequency (IF) signal, compensating for propagation delay of the intermediate (IF) signal in a time unit less than one chip duration according to the received propagation delay information, converting the compensated IF signal into an RF signal, and radiating the RF signal through an antenna. - View Dependent Claims (8, 9, 10)
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11. A method for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the method comprising:
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inserting a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station and receiving the SDH frame looped back by the remote base station; detecting at least one frame alignment word (FAW) from the SDH frame; producing a value of propagation delay between the main base station and the remote base station by adding propagation delay measured according to a count value of round trip delay of the SDH frame containing the test pattern to a delay error calculated from detection information of the FAW; and compensating for propagation delay of a baseband signal to be transmitted to the remote base station in response to the propagation delay value produced by a controller. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the method comprising:
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receiving propagation delay information indicating a propagation delay value from the main base station through the optical cable; converting a baseband signal received from the main base station into an intermediate frequency (IF) signal, and compensating for propagation delay of the IF signal using a time unit less than one chip duration according to the received propagation delay information; and converting the compensated IF signal into an RF signal and radiating the RF signal through an antenna. - View Dependent Claims (18, 19)
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Specification