8 Frequency error

11.263GPPBase Station System (BSS) equipment specificationPart 4: RepeatersRelease 1997TS

8.1 Test purpose

This clause applies only to repeater systems using frequency shift and describes the test of the frequency error.

8.2 Test case

The repeater system shall be levelled according to the recommendations of the manufacturer. For the purpose of the frequency synchronisation of the repeater system it might be necessary to connect the system to a BTS or an equivalent test equipment like a mobile tester. In all cases an accurate frequency synchronisation source has to be used to synchronise the measurement setup.

The test of the repeater system shall be performed at the lowest and the highest ARFCN supported by the repeater system. For the measurement of the frequency error a continuous, sinusoidal and synchronised RF signal shall be fed successively at a frequency of the relevant MS or BTS transmit frequency band into the relevant input port of the repeater. The power level of the RF input signal shall be at least 5 dB below the power level which would produce, when applied within the operating band, maximum rated output power, as declared by the manufacturer. This is to ensure that the equipment is operating in the linear output range.

The average output frequency shall be measured with a frequency counter.

The frequency error of single elements within the repeater system such as master unit or remote unit may be measured as well.

Test environment: Normal

Extreme temperature

8.3 Conformance requirement

The average frequency error of the repeater system shall not exceed 0.1 ppm. If tested, the average frequency error of a single repeater shall not exceed 0.05 ppm.

8.4 Reference requirement

GSM 05.05 [6], annex E