14.2.36 Reference sensitivity – Repeated SACCH in VAMOS configuration

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

14.2.36.1 Definition

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

14.2.36.2 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

14.2.36.3 Test purpose.

To verify that the MS does not exceed the conformance requirement under TU50 /NoFH propagation condition with an allowance for the statistical significance of the test.

14.2.36.4 Method of test

For details on Repeated SACCH Layer 1 test method, please refer to Annex 10.

14.2.36.4.1 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 form 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.

The SS shall use Repeated SACCH for all SACCH block on the downlink for the duration of the test.

Each pair of SACCH blocks (i.e. one Repeated SACCH block-pair) shall be counted as a single sample.

The SS shall send different PCL for each sample following Table 14.2.36-1 for the duration of the test.

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.

14.2.36.4.2 Procedure

a) The fading profile is set to TU50/NoFH 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) 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.

c) Following the reception of the last burst of the MS UL SACCH corresponding to the second SACCH block of a repeated SACCH interval, the SS shall compute the PCL value to use in the SS DL SACCH blocks for the next repeated SACCH interval using Table 14.2.36-1.

i) The first two columns of Table 14.2.36-1 are inputs, the last column is a output.

ii) SACCH blocks are grouped into sets of 2 consecutive SACCH blocks which is called a repeated SACCH interval.

iii) Last commanded PCL by SS refers to the PCL used in the DL SACCH L1 headers for repeated SACCH interval N

iv) Corresponding reported MS PCL refers to the PCL reported in the UL SACCH L1 header of second SACCH block on repeated SACCH interval N

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

Table 14.2.36-1: Power Control Level Used by the 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

d) The SS compares the MS reported PCL in the uplink SACCH L1 header of the Repeated SACCH block against the expected PCL (based on the previously commanded PCL in the downlink SACCH L1 header taking into account round-trip delays). If the MS reported PCL in the uplink SACCH L1 header is different than the expected PCL, this will invoke a frame erasure event.

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

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

14.2.36.5 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 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 14.2.36-2: Minimum test times due to TU50 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

9676

9138

4569

4329

hh:mm:ss

02:41:16

02:32:18

01:16:09

01:12:09

NOTE: Minimum test time calculation due to fading is based on the 960 ms schedule for two SACCH frames

The error rates measured shall not exceed the test limit error rate values given in table 14.2.36-3 through 14.2.36-6 depending on the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

Table 14.2.36-3: Test Limits for Repeated SACCH sensitivity (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

0

-100,5

1,04

0.05

0.0617

5592

5377

01:29:37

GSM 1800 / 1900

SACCH

0

-100,5

Table 14.2.36-4: Test Limits for Repeated SACCH sensitivity (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

0

-102,5

1,04

0.05

0.0617

5592

5377

01:29:37

GSM 1800 / 1900

SACCH

0

-102,5

Table 14.2.36-5: Test Limits for Repeated SACCH sensitivity (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

0

-105,5

1,04

0.05

0.0617

5592

5377

01:29:37

GSM 1800 / 1900

SACCH

0

-105,5

Table 14.2.36-6: Test Limits for Repeated SACCH sensitivity (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

0

-103

1,04

0.05

0.0617

5592

5377

01:29:37

GSM 1800 / 1900

SACCH

0

-103