14.20.9 Repeated FACCH/F – VDTS-1

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

14.20.9.1 Definition

The VAMOS reference test scenarios define a set of interfering signals and corresponding performance limits. These tests are a measure of the capability of the VAMOS receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of these specific unwanted modulated signals.

14.20.9.2 Conformance requirement

– The reference performance for the Repeated Associated control channel performance in VAMOS mode shall be according to subclause 6.2.4.

3GPP TS 45.005 subclause 6.2.1a

– For Repeated Downlink FACCH and Repeated SACCH (see 3GPP TS 44.006), the minimum input signal level for which the reference performance shall be met is specified in table 1i, 1s, 1t, 1v and 1x, according to the propagation condition and type of equipment. The performance requirements for GSM 400 and GSM 700 systems are as for GSM 900 in table 1i, 1s, 1t, 1v and 1x, except that the GSM 400 MS speed is doubled from that of GSM 900, e.g. TU50 becomes TU100, and the GSM 700 MS speed is increased by a factor of 1.2, e.g. TU50 becomes TU60.

3GPP TS 45.005 subclause 6.2.4

– The reference performance for Repeated Downlink FACCH and Repeated SACCH shall be FER £ 5%.

3GPP TS 45.005 subclause 6.2.4

– When calculating FER, a FACCH frame and its repetition or a SACCH frame and its repetition respectively, shall be counted as one frame and a frame erasure shall be counted when neither the FACCH frame nor its repetition or neither the SACCH frame nor its repetition respectively, could be successfully decoded.

3GPP TS 45.005 subclause 6.2.4

– For AQPSK modulated speech channels and control channels in downlink, the wanted input signal level shall be: -93 dBm + Ir, where Ir = the interference ratio according to tables 2aa for VAMOS I MS, 2ab for VAMOS II MS and 2ag for VAMOS III MS for VDTS-1, VDTS-2 and VDTS-3 (see subclause Q.1) for speech and associated control channels in VAMOS mode in downlink.

3GPP TS 45.005, subclause 6.3.4

– The C/I1 values in tables 2aa, 2ab and 2ag are ratios of received powers expressed in dB; where C is the received power of the downlink signal using Normal burst for AQPSK (see 3GPP TS 45.002) and I1 is the received power of the dominant external interferer (Co-channel 1 in tables Q.1-1 to Q.1-3) for VDTS-1 to VDTS-3 or the received power of the adjacent channel interferer for VDTS-4 (Adjacent 1 in table Q.1-4).

3GPP TS 45.005, subclause Q.1

14.20.9.3 Test purpose

To verify that the MS does not exceed the conformance requirements for Repeated FACCH/F in a VDTS-1 configuration under propagation condition TUhigh with an allowance for the statistical significance of the test.

14.20.9.4 Method of test

14.20.9.4.1 Initial conditions

A call is set up according to the generic call set up procedure on a TCH/F with an ARFCN in the mid ARFCN range. The power control level set to maximum power. RADIO_LINK_TIMEOUT is set to maximum.

The SS transmits a Standard Test Signal C1 (AQPSK) (wanted signal) on the active VAMOS subchannel (subchannel 2) using trainings sequence 5 from TSC set 2. The other VAMOS subchannel (subchannel 1) uses trainings sequences 5 from TSC set 1.

The SCPIR_DL is set to +0 dB.

Specific PICS Statements:

– VAMOS I supported (TSPC_VAMOS_Type1)

– VAMOS IIsu

– VAMOS III supported (TSPC_VAMOS_Type3)

For MS indicating VAMOS III support, connect the SS to the MS antenna connectors according to Annex A1.1.6.2.pported (TSPC_VAMOS_Type 2)

14.20.9.4.2 Procedure

a) In addition to the wanted signal, the SS generates an independent, uncorrelated interfering signal, Standard Test Signal I1 (unwanted signal). The modulation of I1 shall be AQPSK and the SCPIR_DL shall be set to 0 dB (scenario VDTS-1). Signal I1 is continuous and has no fixed relationship with the bit transitions of the wanted signal. The interfering signal level is set to -93 dBm and the fading characteristic of the wanted and the interfering signal is TUHigh noFH for MS indicating VAMOS I or VAMOS II support and TUhigh noFH/(Corr.=0, AGI=0 dB as per 3GPP TS 45.005 Annex Q.7) for MS indicating VAMOS III support.

b) Depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values, the SS sets the level of the wanted signal specified by Clev in table 14.20.9-2 through 14.20.9-6.

c) The SS sends a Layer 3 message which does not require a Layer 3 response from the MS. Each repeated L2 frame indicates a frame erasure event.

d) The SS determines the number of frame erasure events during at least the minimum number of samples of FACCH/F frames.

e) For MS indicating VAMOS III support, steps b) to d) are repeated with the SS fading function set in turn to TU high/(Corr.=0,7, AGI=-6 dB as per 3GPP TS 45.005 Annex Q.7).

14.20.9.4.3 Test requirements

Testing should be performed using statistical methods that lead to an early pass/fail decision with test time significantly reduced for MS with FER is not on the limit.

For more information on statistical testing refer to Annex 7 (A7.1.3.2)

Before limit checking is valid the minimum test time due to fading needs to be considered:

Table 14.20.9-1: Minimum test times due to TU high fading conditions

TCH/F @ 50 km/h

Frequency /MHz

850

900

1800

1900

Wave length / m

0,35

0,33

0,17

0,16

Min. Test time /s

604

570

285

270

hh:mm:ss

00:10:04

00:09:30

00:04:45

00:04:30

NOTE: Minimum test time calculation due to fading is based on the best rate 50/3 frame relation in table 14.20.9-4

The error rate measured in this test shall be tested according to the values given in table 14.20.9-2 through 14.20.9-6 depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

Table 14.20.9-2: Statistical test limits for Repeated FACCH/F (VAMOS I MS)

VDTS-1 (GSM 900 / 850)

Channel

SCPIR _DL/dB

Clev /dBm
[-93] +Ir

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-86

0.05

0.0617

5592

VDTS-1 (GSM 1800 / 1900)

FACCH/F

0

-86,5

Table 14.20.9-3: Statistical test limits for Repeated FACCH/F (VAMOS II MS)

VDTS-1 (GSM 900 / 850)

Channel

SCPIR _DL/dB

Clev /dBm
[-93] +Ir

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-86

0.05

0.0617

5592

VDTS-1 (GSM 1800 / 1900)

FACCH/F

0

-86,5

Table 14.20.9-4: Estimated test times

Estimated test time (best rate 50/3 per second) (s)

Estimated test time (best rate 50/3 per second) (hh:mm:ss)

Estimated test time (worst rate 50/6 per second) (s)

Estimated test time (worst rate 50/6 per second) (hh:mm:ss)

336

00:05:36

671

00:11:11

Table 14.20.9-5: Statistical test limits for Repeated FACCH/F (VAMOS III MS, Corr.=0.0, AGI=0 dB)

VDTS-1 (GSM 900 / 850)

Channel

SCPIR _DL/dB

Clev /dBm
[-93] +Ir

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-95,5

0.05

0.0617

5592

VDTS-1 (GSM 1800 / 1900)

FACCH/F

0

-96

Table 14.20.9-6: Statistical test limits for Repeated FACCH/F (VAMOS III MS, Corr.=0.7, AGI=-6 dB)

VDTS-1 (GSM 900 / 850)

Channel

SCPIR _DL/dB

Clev /dBm
[-93] +Ir

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-93,5

0.05

0.0617

5592

VDTS-1 (GSM 1800 / 1900)

FACCH/F

0

-94