Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-11-19
2001-07-10
Maung, Nay (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S423000, C455S067150
Reexamination Certificate
active
06259912
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to generally to a power detector and test mobile unit (PTMU) for a base station, more particularly relates to temperature calibrated power detection apparatus and a test mobile unit for measurement of transmission power of a base station and call-test of base station in a code division multiple access (CDMA) digital mobile communication system.
DESCRIPTION OF THE RELATED ART
A conventional apparatus for use in testing a base station in a communications system is disclosed in U.S. Pat. No. 4,443,661. Such an apparatus transmits a signal to the base station and receives a reply signal from the base station in order to monitor the base station for problems within a transceiver portion of the base station. However, such a conventional apparatus only provides a general indication of whether the base station has a problem, it cannot specify the nature of the problem and cannot accurately determine the transmission power of the base station. If any power estimation is conducted by such a system, the estimation is prone to exhibit a low rate of accuracy due to changes in the environment outside the base station system, such as a temperature. Without knowing such parameters, prior art systems cannot fully evaluate the operational status of the base station.
SUMMARY OF THE INVENTION
The present invention is intended to provide apparatus and methods for power detection and a test mobile unit for measuring the transmission power of a base station as well as providing call-test function on a base station in a code division multiple access (CDMA) digital mobile communication system. Additionally, the present invention is intended to provide a method of calibration for the call-test function of the base station.
The power detection apparatus and a test mobile unit for measurement of transmission power of a base station and call-test of base station in a communication system includes a transmit power detection board (TPDB) for converting the strength of a radio frequency (RF) input signal to a digital value; a test mobile (TM) for performing a call-test of the base station; and a BTU (base station test unit) control and interface board assembly (BCIA) controlling the TPDB and TM.
In a method of calibration, a power input signal applied to a power detector and test mobile unit (PTMU) is sequentially varied by a signal generator and a digital value corresponding to each of the varied power input levels of the PTMU is sequentially stored in a EEPROM of the transmit power detection board (TPDB). The digital values are stored in accordance with a memory address under the control of the BTU control and interface board (BCIA) so that a plurality of PTMUs for measurement of transmission power of a base station and call-test of a base station in a code division multiple access (CDMA) digital mobile communication system, have a substantially constant value of measurement for a specific input power.
The methods for measurement of transmission power of a base station and performing a call-test of a base station in a code division multiple access (CDMA) digital mobile communication system include the steps of performing a calibration operation so that the product characteristic of a plurality of transmit power detection boards (TPDBs) have a substantially constant value for a specific input; storing an error pattern of power measurements in a EEPROM for the test value of a plurality of power input values to a power detector and test mobile unit (PTMU) according to a measured temperature; converting the value of measurement to a digital value and sending the digital value to a BTU control and interface board assembly (BCIA) by the detector of the TPDB, if a radio frequency (RF) signal within the range of power measurement is inputted as RF1; searching the converted digital values in the EEPROM and calculating an absolute value of input RF signal power by calculating the value of power according to the location of the corresponding memory by the BCIA; and performing call-test of base station origination-test mobile (TM) termination and call-test of TM origination-base station termination by the TM of PTMU.
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Dilworth & Barrese LLP
Maung Nay
Samsung Electronics Co,. Ltd.
Vuong Quochien B.
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