13.1a Frequency error in VAMOS configuration
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
The frequency error is the difference in frequency, after adjustment for the effect of the modulation and phase error, between the RF transmission from the MS and either:
– the RF transmission from the BS; or
– the nominal frequency for the ARFCN used.
The phase error is the difference in phase, after adjustment for the effect of the frequency error, between the RF transmission from the MS and the theoretical transmission according to the intended modulation.
13.1a.2 Conformance requirement
1. The MS carrier frequency shall be accurate to within 0,1 ppm, or accurate to within 0,1 ppm compared to signals received from the BS. For GSM 400 MS a value of 0,2 ppm shall be used in both cases.
1.1 Under normal conditions; 3GPP TS 45.10, subclause 6.1.
1.2 Under extreme conditions; 3GPP TS 45.10, subclause 6.1; 3GPP TS 45.05, subclause 4.4; 3GPP TS 45.05, annex D in subclauses D.2.1 and D.2.2.
13.1a.3 Test purpose
1. To verify that the MS carrier frequency error does not exceed 0,1 ppm (0,2 ppm for GSM 400):
1.1 Under normal conditions.
1.2 Under extreme conditions.
NOTE: The transmit frequency accuracy of the SS is expected to be sufficient to ensure that the difference between 0,1 ppm (0,2 ppm for GSM 400) absolute and 0,1 ppm (0,2 ppm for GSM 400) compared to signals received from the BS would be small enough to be considered insignificant.
13.1a.4 Method of test
This test uses the same measurement process as test 13.1.
13.1a.4.1 Initial conditions
A call is set up according to the Generic call setup procedure in the mid ARFCN range with a power control level set to maximum power..
The SS activates ciphering mode.
NOTE 1: Ciphering mode is active during this test to give a pseudo-random bit stream to the modulator.
The SS generates Standard Test Signal C1 of annex 5 using AQPSK modulation with SCPIR=0dB, on the active VAMOS subchannel (subchannel 2) using trainings sequence 5 form TSC set 2. The other VAMOS subchannel (subchannel 1) uses trainings sequences 5 from TSC set 1.
The SS commands the MS to complete the traffic channel loop back without signalling of erased frames (see subclause 188.8.131.52).
The power level of the Standard Test Signal C1 is set 20 dB above reference sensitivity level( ).
Specific PICS statements:
a) The SS calculates the frequency accuracy of the captured burst as described in test 13.1.
b) Steps a) is repeated for 20 bursts spaced over a period of not less than 1800s).
c) The SS changes to SCPIR=-4dB, all other conditions remain constant.
d) The SS calculates the frequency accuracy of the captured burst as described in test 13.1.
e) Steps d) is repeated for 20 bursts spaced over a period of not less than 300s).
f) Steps a) to e) are repeated under extreme test conditions (see annex 1, TC2.2).
13.1a.5 Test requirements
13.1a.5.1 Frequency error
For all measured bursts, the frequency error, derived in repeats of steps a) and d), shall be less than 0,1 ppm, except for GSM 400 MS where a value of 0,2 ppm shall be used.