14.2.35 Reference sensitivity SACCH performance in VAMOS configuration

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

14.2.35.1 Definition

The reference sensitivity for control channels is the signal level at the MS receiver input at which a certain FER must be achieved.

14.2.35.2 Conformance requirement.

3GPP TS 45.005 subclause 6.2.1a

The reference performance in VAMOS Mode shall be:

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

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. The levels are given for VAMOS I MS, VAMOS II MS, VAMOS III MS and normal BTS separately.

14.2.35.3 Test purpose

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

14.2.35.4 Method of test

14.2.35.4.1 Initial conditions

A call is set up according to the generic call set up procedure on a TCH/F with an ARFCN in the Low ARFCN range, 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 fro m TSC set 2. The other VAMOS subchannel (subchannel 1) uses trainings sequences 5 from TSC set 1.

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.

14.2.35.4.2 Procedure

Note: The test procedure is derived from 51.010-10 annex 10 and adapted to single SACCH reception.

a) The fading function is set to TUhigh for MS indicating VAMOS I or VAMOS II support and TUhigh/(Corr.=0, AGI=0 dB as per 3GPP TS 45.005 Annex Q.7) for MS indicating VAMOS III support.

b) The SS sets SCPIR_DL to +4 dB.

c) 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 14.2.36-3 through table 14.2.36-6.

d) Following the reception of the last burst of the MS UL SACCH corresponding to the second SACCH block of a SACCH interval, the SS shall compute the PCL value to use in the SS DL SACCH blocks for the next SACCH interval using Table 14.2.35-1.

i) The first two columns of Table 14.2.35-1 are inputs, the last column is a output.

ii) Last commanded PCL by SS refers to the PCL used in the DL SACCH L1 header of SACCH block N

iii) Corresponding reported MS PCL refers to the PCL reported in the UL SACCH L1 header of SACCH

block N

iv) Next commanded PCL by SS refers to the PCL that the SS will use in the DL SACCH L1 headers for SACCH block N+1.

Table 14.2.35-1: Power Control Level Used by SS

Last commanded PCL by SS

Corresponding Reported MS PCL

Next commanded PCL by SS

7

7

8

7

8

9

7

9

8

8

7

9

8

8

9

8

9

7

9

7

8

9

8

7

9

9

7

f) The SS determines the frame erasure events during at least the minimum number of samples of SACCH frames.

g) The SS sets SCPIR_DL to 0 dB and steps c) to f) are repeated.

h) The SS sets SCPIR_DL to -4 dB and steps c) to f) are repeated.

i) For MS indicating VAMOS II or VAMOS III support, steps c) to f) are repeated for SCPIR -8 dB and -10 dB.

j) For MS indicating VAMOS III support, steps b) to i) 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.

14.2.35.5 Test Requirements

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

For 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 14.2.35-2: Minimum test times due to TU50 fading conditions

Full Rate @ 50km/h

Frequency /MHz

850

900

1800

1900

Wave length / m

0,35

0,33

0,17

0,16

Min. Test time /s

4835

4566

2283

2163

hh:mm:ss

01:20:35

01:16:06

00:38:03

00:36:03

NOTE: Minimum test time calculation due to fading based on the 480ms schedule

The error rates measured shall not exceed the test limit error rate values given in table 14.2.35-3 through 14.2.35-6 depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

Table 14.2.35-3: Limits for SACCH (VAMOS I MS)

(GSM 900 / 850)

Channel

SCPIR_DL /dB

Clev /dBm

Samples per s

Orig. BER requirement

Derived test limit

Target number of samples

Target test time /s

Target test time
(hh:mm:ss)

SACCH

4

-100

2.08

0.05

0.0617

5592

2688

00:44:48

0

-97

-4

-93,5

(GSM 1800 / 1900)

SACCH

4

-100

0

-97

-4

-93,5

Table 14.2.35-4: Limits for SACCH (VAMOS II MS)

(GSM 900 / 850)

Channel

SCPIR_DL /dB

Clev /dBm

Samples per s

Orig. BER requirement

Derived test limit

Target number of samples

Target test time /s

Target test time
(hh:mm:ss)

SACCH

4

-100

2.08

0.05

0.0617

5592

2688

00:44:48

0

-97,5

-4

-96

-8

-93

-10

-91

(GSM 1800 / 1900)

SACCH

4

-100

0

-97,5

-4

-96

-8

-92,5

-10

-90,5

Table 14.2.35-5: Limits for SACCH (VAMOS III MS, Corr=0.0, AGI=0 dB)

(GSM 900 / 850)

Channel

SCPIR_DL /dB

Clev /dBm

Samples per s

Orig. BER requirement

Derived test limit

Target number of samples

Target test time /s

Target test time
(hh:mm:ss)

SACCH

4

-104,5

2.08

0.05

0.0617

5592

2688

00:44:48

0

-103

-4

-101

-8

-98,5

-10

-96,5

(GSM 1800 / 1900)

SACCH

4

-104

0

-102,5

-4

-100,5

-8

-98

-10

-96

Table 14.2.35-6: Limits for SACCH (VAMOS III MS, Corr=0.7, AGI=-6 dB)

(GSM 900 / 850)

Channel

SCPIR_DL /dB

Clev /dBm

Samples per s

Orig. BER requirement

Derived test limit

Target number of samples

Target test time /s

Target test time
(hh:mm:ss)

SACCH

4

-101

2.08

0.05

0.0617

5592

2688

00:44:48

0

-99,5

-4

-98

-8

-95

-10

-93,5

(GSM 1800 / 1900)

SACCH

4

-101

0

-99

-4

-97

-8

-94,5

-10

-92,5