13.2a Frequency error under multipath and interference conditions in VAMOS configuration

3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS

13.2a.1 Definition

The frequency error under multipath and interference conditions is a measure of the ability of the MS to maintain frequency synchronization with the received signal under conditions of Doppler shift, multipath reception and interference.

13.2a.2 Conformance requirement

1. The MS carrier frequency error for each burst shall be accurate to within 0,1 ppm (0,2 ppm for GSM 400), or 0,1 ppm (0,2 ppm for GSM 400) compared to signals received from the BS for signal levels down to 3 dB below the reference sensitivity level.

1.1 Under normal conditions; 3GPP TS 45.10, subclauses 6 and 6.1.

1.2 Under extreme conditions; 3GPP TS 45.10, subclauses 6 and 6.1; 3GPP TS 45.05 annex D in subclauses D.2.1 and D.2.2.

2. The MS carrier frequency error for each burst shall be accurate to within 0,1 ppm (0,2 ppm for GSM 400), or 0,1 ppm (0,2 ppm for GSM 400) compared to signals received from the BS for 3 dB less carrier to interference ratio than the reference interference ratios (3GPP TS 05.10, subclauses 6 and 6.1).

13.2a.3 Test purpose

1. To verify that the MS carrier frequency error at reference sensitivity, under conditions of multipath and Doppler shift does not exceed 0,1 ppm (0,2 ppm for GSM 400) + the frequency error due to the Doppler shift of the received signal and the assessment error in the MS.

1.1 Under normal conditions.

1.2 Under extreme conditions.

NOTE 1: Although the conformance requirement states that frequency synchronization should be maintained for input signals 3 dB below reference sensitivity. Due to the Radio Link Failure counter this test condition cannot be established. Hence all tests in this subclause are conducted at reference sensitivity level.

2. To verify that the MS carrier frequency error, under interference conditions and TUlow fading profile, does not exceed 0,1 ppm (0,2 ppm for GSM 400) + the frequency error due to the Doppler shift of the received signal and the assessment error in the MS.

NOTE 2: The test adds the effect of Doppler shift to the requirements as the conformance requirement refers to signals input to the MS receiver whereas the frequency reference for measurement will not take account of the Doppler shift.

13.2a.4 Method of test

This test uses the same measurement process as test 13.1 for the MS operating under various RF conditions.

NOTE: The BA list sent on the BCCH and the SACCH will indicate at least six surrounding cells with at least one near to each band edge. It is not necessary to generate any of these BCCH but if they are provided none will be within 5 channels of the ARFCN used for the serving BCCH or TCH.

13.2a.4.1 Initial conditions

The MS is brought into the idle updated state on a serving cell with BCCH in the mid ARFCN range.

The SS commands the MS to transmit at maximum power.

13.2a.4.2 Procedure

a) The level of the serving cell BCCH is set to 10 dB above the reference sensitivity level(  ) and the fading function set to RA. The SS waits 30 s for the MS to stabilize to these conditions. The SS is set up to capture the first burst transmitted by the MS during call establishment. A call is initiated by the SS on a channel in the mid ARFCN range as described for the generic call set up procedure but to a TCH at level 10 dB above the reference sensitivity level(  ), 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. Fading function set to RA.

b) The SS calculates the frequency accuracy of the captured burst as described in test 13.1.

c) The SS sets the serving cell BCCH and TCH to the reference sensitivity level(  ) applicable to the type of MS, still with the fading function set to RA and then waits 30 s for the MS to stabilize to these conditions.

d) The SS shall capture subsequent bursts from the traffic channel in the manner described in test 13.1.

NOTE: Due to the very low signal level at the MS receiver input the MS receiver is liable to error. The "looped back" bits are therefore also liable to error, and hence the SS does not know the expected bit sequence. The SS will have to demodulate the received signal to derive (error free) the transmitter burst bit pattern. Using this bit pattern the SS can calculate the expected phase trajectory according to the definition within 3GPP TS 05.04.

e) The SS calculates the frequency accuracy of the captured burst as described in test 13.1.

f) Steps d) and e) are repeated for 5 traffic channel bursts spaced over a period of not less than 20 s.

g) The initial conditions are established again and steps a) to f) are repeated but with the fading function set to HT100 (HT200 for GSM 400, HT120 for GSM 700).

h) The initial conditions are established again and steps a) to f) are repeated but with the fading function set to TU50 (TU100 for GSM 400, TU 60 for GSM 700).

i) The initial conditions are established again and steps a) and b) are repeated but with the following differences:

– the levels of the BCCH and TCH are set to 18 dB above reference sensitivity level(  ) and SCPIR=-4dB.

– two further independent interfering signals are sent on the same nominal carrier frequency as the BCCH and TCH and at a level 10 dB below the level of the TCH and modulated with random data, including the midamble.

– the fading function for all channels is set to TUlow.

– the SS waits 100 s for the MS to stabilize to these conditions.

j) Repeat steps d) to f), except that at step f) the measurement period must be extended to 200 s and the number of measurements increased to 20.

k) Repeat step h) under extreme test conditions (see annex 1, TC2.2).

13.2a.5 Test requirements

The frequency error, with reference to the SS carrier frequency as measured in repeats of step e), for each measured burst shall be less than the values shown in tables 13-1a and 13-1b.

Table 13-1a: Requirements for frequency error under multipath,
Doppler shift and interference conditions

T-GSM 810, GSM 850 and GSM 900

DCS 1 800

PCS 1 900

Propagation condition

Permitted frequency error

Propagation condition

Permitted frequency error

Propagation condition

Permitted frequency error

RA250

±300 Hz

RA130

±400 Hz

RA130

±420 Hz

HT100

±180 Hz

HT100

±350 Hz

HT100

±370 Hz

TU50

±160 Hz

TU50

±260 Hz

TU50

±280 Hz

TU3

±230 Hz

TU1,5

±320 Hz

TU1,5

±330 Hz

Table 13-1b: Requirements for frequency error under multipath,
Doppler shift and interference conditions

GSM 450

GSM 480

GSM 700

Propagation condition

Permitted frequency error

Propagation condition

Permitted frequency error

Propagation condition

Permitted frequency error

RA500

±300 Hz

RA500

±300 Hz

RA 300

±300 Hz

HT200

±180 Hz

HT200

±180 Hz

HT 120

±180 Hz

TU100

±160 Hz

TU100

±160 Hz

TU 60

±160 Hz

TU6

±230 Hz

TU6

±230 Hz

TU 3.6

±230 Hz