14.20.11 Downlink DTX TCH / AHS in VAMOS configuration

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

14.20.2.1 Definition

The reference sensitivity is the signal level at the MS receiver input at which a certain BER and FER must be achieved.

14.20.11.2 Conformance requirement

– For speech channels in VAMOS Mode, and their associated control channels, the minimum input signal level for which the reference performance shall be met is specified in table 1s, 1t, 1u, 1v, 1x and 1y according to the propagation condition and type of equipment.

– For half rate speech channels (TCH/HS, TCH/AHSx) FER:  1 %

– In addition for speech channels the residual class Ib BER and residual class II BER performance shall not exceed the specified values in table 1s, 1t, 1u, 1x, 1y and 1v at the corresponding signal level in dBm.

3GPP TS 45.005, subclause 6.2.1a

        1. Test purpose

The purpose of this test case is to verify the VAMOS II or VAMOS III mobile receiver performance when the paired VAMOS subchannel user goes into and comes out of DTX and to verify that the MS does not exceed conformance requirements under propagation condition TUhigh with no frequency hopping with an allowance for the statistical significance of the test.

        1. Method of test

The test is performed according the VAMOS DTX test scenario in downlink specified in 3GPP 45.005 Q.6

14.20.11.4.1 Initial conditions

A call is set up according to the generic call set up procedure on a TCH/AHS 7.4 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 form TSC set 2. The other VAMOS subchannel (subchannel 1) uses trainings sequences 5 from TSC set 1.

DTX is set on the VAMOS subchannel 1 according to the probability ratio specified in 3GPP 45.005 Q.6

Specific PICS Statements:

– 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.

14.20.11.4.2 Procedure

a) The fading profile for the wanted is set to TUHigh for VAMOS II MS and TUhigh/(Corr.=0, AGI=0 dB as per 3GPP TS 45.005 Annex Q.7) for VAMOS III MS.

b) The SCPIR_DL is set to -10 dB.

c) Depending on the network frequency the SS sets the signal level for the AQPSK- and GMSK modulated signal indicated in table 14.20.11-2

d) The SS compares the modulation of the signal sent to the MS with the signal which is looped back from the receiver after demodulation and decoding, and checks the frame erasure indication.

e) The SS determines the number of residual bit error events for the bits of the class Ib and II, by examining at least the minimum number of samples of consecutive bits of class Ib and II. Bits are only taken from those frames not signalled as erased.

f) The SS also determines the frame erasure events by examining at least the minimum number of samples of consecutive frames and assuming a frame is received successfully if it is not signalled as erased.

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).

14.20.11.4.3 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 14.20.11-1: Minimum test times due to TU high fading conditions

Fading speed 50km/h

Frequency /MHz

850

900

1800

1900

Wave length / m

0,35

0,33

0,17

0,16

Min. Test time /s

403

380

190

180

hh:mm:ss

00:06:43

00:06:20

00:03:10

00:03:00

The error rate measured in this test shall be tested according to the values given in table 14.20.11-3 to table 14.20.11-8 depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

NOTE: The wanted signal level are derived form calculation using 3GPP TS 45.005 table 1u for VAMOS II MS, 1y for VAMOS III MS and Annex Q.6 (VAMOS DTX scenario in downlink).

Table 14.20.11-2: Signal level for AQPSK and GMSK

Frequency band

Signal level /dBm

AQPSK

GMSK

GSM 900 and GSM 850

-86,15

-96,65

DCS 1800 and PCS 1900

-85,15

-95,65

Table 14.20.11-3: Statistical test limits for GSM 850 and GSM 900 TCH/AHS 7.4 (VAMOS II MS)

0.4 to 0.9GHz

Frames per s

Orig. BER requirements

Derived test limit

Target number of samples

Target test time (s)

Target test time
(hh:mm:ss)

Channel

SCPIR / dB

Channel

clas1b per s

class II per s

AHS 7.4

-10

Frames

50

0.010000

0.012340

27958

560

00:09:19

Class1b

2950

0,002500

0,003085

111831

38

00:00:38

Class II

1400

0,022800

0,028135

12262

9

00:00:09

Table 14.20.11-4: Statistical test limits for DCS 1800 and PCS 1900 TCH/AHS 7.4 (VAMOS II MS)

1.8 to 1.9GHz

 

Frames per s

Orig. BER requirements

Derived test limit

Target number of samples

Target test time (s)

Target test time
(hh:mm:ss)

Channel

SCPIR / dB

Channel

clas1b per s

class II per s

AHS 7.4

-10

Frames

50

0.010000

0.012340

27958

560

00:09:19

Class1b

2950

0,0028

0,003455

99850

34

00:00:34

Class II

1400

0,027

0,033318

10355

7

00:00:07

Table 14.20.11-5: Statistical test limits for GSM 850 and GSM 900 TCH/AHS 7.4 (VAMOS III MS, Corr=0.0, AGI=0 dB)

0.4 to 0.9GHz

Frames per s

Orig. BER requirements

Derived test limit

Target number of samples

Target test time (s)

Target test time
(hh:mm:ss)

Channel

SCPIR / dB

Channel

clas1b per s

class II per s

AHS 7.4

-10

Frames

50

0.010000

0.012340

27958

560

00:09:19

Class1b

2950

0,002500

0,003085

111831

38

00:00:38

Class II

1400

0,022800

0,028135

12262

9

00:00:09

Table 14.20.11-6: Statistical test limits for DCS 1800 and PCS 1900 TCH/AHS 7.4 (VAMOS III MS, Corr=0.0, AGI=0 dB)

1.8 and 1.9GHz

Frames per s

Orig. BER requirements

Derived test limit

Target number of samples

Target test time (s)

Target test time
(hh:mm:ss)

Channel

SCPIR / dB

Channel

clas1b per s

class II per s

AHS 7.4

-10

Frames

50

0.010000

0.012340

27958

560

00:09:19

Class1b

2950

0,0028

0,003455

99850

34

00:00:34

Class II

1400

0,027

0,033318

10355

7

00:00:07