7 Frequency stability
25.1533GPPRelease 17TSUTRA repeater conformance testing (LCR TDD)
Frequency error is the measure of the difference between the frequency of the received signal and the frequency of the re-transmitted signal.
7.1 Definition and applicability
The frequency stability is a measure of the frequency deviation of the output signal with respect to the input signal. The test shall address the uplink and the downlink path of the Repeater.
7.2 Minimum Requirement
In normal conditions as specified in section 5.4.1 the frequency deviation shall be within ± 0,01 ppm.
7.3 Test purpose
To verify that the Frequency Error is within the limit specified in 7.2.
7.4 Method of test
7.4.1 Initial conditions
1) Set-up the equipment as shown in annex A.
2) Connect the signal generator equipment to the Repeater input port.
3) Connect the signal analyser to the Repeater output port..
7.4.2 Procedure
1) Set the signal generator to transmit one signal according to table 7.1.
Table 7.1: Parameters of the transmitted signal for Frequency stability test
Parameter |
Value/description |
TDD Duty Cycle |
TS i; i = 0, 1, 2, …, 6: transmit, if i is 0, 4,5,6; receive, if i is 1,2,3. |
Time slots under test |
TS4, TS5 and TS6 |
Number of DPCH in eachtime slot under test |
1 |
BS output power setting |
PRAT |
Data content of DPCH |
real life (sufficient irregular) |
2) Adjust the input power to the Repeater to create the maximum nominal Repeater output power at maximum gain.
3) Measure the frequency error for both paths uplink and downlink of the Repeater.
7.5 Test requirements
The measurement result of 7.4.2 shall not exceed:
| f IN – f out | (f out * 0,01 ppm) + 12 Hz