14.20.6 FACCH/F – VDTS-1

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

14.20.6.1 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.

14.20.6.2 Conformance requirement

– For AQPSK modulated speech channels ( TCH/HS, TCH/AFSx, TCH/AHSx, TCH/EFS, TCH/WFSx – in downlink), and their associated control channels, the applicable requirements are in tables 2aa for VAMOS I MS, 2ab for VAMOS II MS and 2ag for VAMOS III MS.

3GPP TS 45.005, subclause 6.3.2.1

– 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

– For signalling channels (FACCH/F, FACCH/H, SACCH) FER:  5 %

3GPP TS 45.005, subclause 6.2.1a

– 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

14.20.6.3 Test purpose

To verify that the MS does not exceed the conformance requirements for FACCH/F under propagation condition TUhigh with an allowance for the statistical significance of the test.

14.20.6.4 Method of test

14.20.6.4.1 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 +4 dB.

Specific PICS Statements:

– VAMOS I supported (TSPC_VAMOS_Type1)

– VAMOS II supported (TSPC_VAMOS_Type2)

– 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.

14.20.6.4.2 Procedure

a) In addition to the wanted signal, the SS produces 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 of 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 C_lev in table 14.20.6-2 through 14.20.6-5.

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) The SS repeats step b) to d) with SCPIR_DL values 0 dB and -4 dB.

f) If the MS signals VAMOS II or VAMOS III support step b) to d) shall be repeated with SCPIR_DL values -8 dB and -10 dB.

g) For MS indicating VAMOS III support, steps b) to f) 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).

NOTE: These frames will not be consecutive but it is expected that the statistical significance of the tests will not be unduly degraded.

14.20.6.4.3 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/BER not on the limit.

For more information on statistical testing of BER/BLER performance, especially the definition of limit lines 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 14.20.6-1: Minimum test times due to TU high fading conditions

Full Rate 50 km/h
Frequency	0,85	0,9	1,8	1,9	GHz
Wavelength	0,35	0,33	0,17	0,16	m
min test time	629	594	297	281	s
	00:10:29	00:09:54	00:04:57	00:04:41	hh:mm:ss

The error rate measured in this test shall be tested according to the values given in table 14-12.20.6-2 through 12.20.6-5 depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

Table 14-12.20.6-2: Statistical test limits for FACCH/F (VAMOS I MS)

VDTS-1 (GSM 900 / 850)
Channel	SCPIR_DL /dB	Clev /dBm -93 +Ir	Samples per s	Orig. BER requirement	Derived test limit	Target number of samples	Target test time /s	Target test time (hh:mm:ss)
FACCH/F	4	-83,5	16	0.05	0.0617	5592	350	00:05:50
	0	-81,5
	-4	-78,5
VDTS-1 (GSM 1800 / 1900)
FACCH/F	4	-84,5
	0	-82,5
	-4	-79,5

Table 14-12.20.6-3: Statistical test limits for FACCH/F (VAMOS II MS)

VDTS-1 (GSM 900 / 850)
Channel	SCPIR_DL /dB	Clev /dBm -93 +Ir	Samples per s	Orig. BER requirement	Derived test limit	Target number of samples	Target test time /s	Target test time (hh:mm:ss)
FACCH/F	4	-83,5	16	0.05	0.0617	5592	350	00:05:50
	0	-81,5
	-4	-79,5
	-8	-76
	-10	-74,5
VDTS-1 (GSM 1800 / 1900)
FACCH/F	4	-84,5
	0	-82,5
	-4	-80
	-8	-77
	-10	-75

Table 14-12.20.6-4: Statistical test limits for FACCH/F (VAMOS III MS, Corr.=0.0, AGI=0 dB)

VDTS-1 (GSM 900 / 850)
Channel	SCPIR_DL /dB	Clev /dBm -93 +Ir	Samples per s	Orig. BER requirement	Derived test limit	Target number of samples	Target test time /s	Target test time (hh:mm:ss)
FACCH/F	4	-96,5	16	0.05	0.0617	5592	350	00:05:50
	0	-94,5
	-4	-92,5
	-8	-89
	-10	-86,5
VDTS-1 (GSM 1800 / 1900)
FACCH/F	4	-96,5
	0	-95
	-4	-92,5
	-8	-89
	-10	-86

Table 14-12.20.6-5: Statistical test limits for FACCH/F (VAMOS III MS, Corr.=0.7, AGI=-6 dB)

VDTS-1 (GSM 900 / 850)
Channel	SCPIR_DL /dB	Clev /dBm -93 +Ir	Samples per s	Orig. BER requirement	Derived test limit	Target number of samples	Target test time /s	Target test time (hh:mm:ss)
FACCH/F	4	-93	16	0.05	0.0617	5592	350	00:05:50
	0	-91
	-4	-89
	-8	-85,5
	-10	-83,5
VDTS-1 (GSM 1800 / 1900)
FACCH/F	4	-93,5
	0	-91,5
	-4	-89
	-8	-85,5
	-10	-83,5