14.2.37 Reference sensitivity – Repeated FACCH/F in VAMOS configuration

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

14.2.37.1 Definition

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

14.2.37.2 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

14.2.37.3 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.

14.2.37.4 Method of test

14.2.37.4.1 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, power control level set to maximum power.

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 FACCH for command and response frames for the duration of the test.

Each pair of FACCH blocks shall be counted as a single sample.

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.

14.2.37.4.2 Procedure

a) The fading function 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 14.2.37-2 through table 14.2.37-6.

c) The SS sends a Layer 3 message which does not require a Layer 3 response from the MS. Due to the low signal level the MS may not be able to acknowledge an RR frame and the L2 entity of the SS will repeat the Layer 2 frame. Each retransmitted L2 frame will be counted and will indicate a frame erasure event.

d) The SS determines the 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).

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

14.2.37.5 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 14.2.37-1: 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

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 14.2.37-4

The error rates measured shall not exceed the test limit error rate values given in table 14.2.37-2 through table 14.2.37-6 depending of the indicated VAMOS type and the relevant antenna correlation and antenna gain imbalance values.

Table 14.2.37-2: Test Limits for Repeated FACCH/F sensitivity (VAMOS I MS)

GSM 900 / 850

 

Channel

SCPIR_DL /dB

Clev
/dBm

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-98,5

0.05

0.0617

5592

GSM 1800 / 1900

FACCH/F

0

-99

Table 14.2.37-3: Test Limits for Repeated FACCH/F sensitivity (VAMOS II MS)

GSM 900 / 850

 

Channel

SCPIR_DL /dB

Clev
/dBm

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-101

0.05

0.0617

5592

GSM 1800 / 1900

FACCH/F

0

-101,5

Table 14.2.37-4: Maximum test times

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

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

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

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

336

00:05:36

671

00:11:11

Table 14.2.37-5: Test Limits for Repeated FACCH/F sensitivity (VAMOS III MS, Corr=0.0, AGI=0 dB)

GSM 900 / 850

 

Channel

SCPIR_DL /dB

Clev
/dBm

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-104

0.05

0.0617

5592

GSM 1800 / 1900

FACCH/F

0

-104,5

Table 14.2.37-6: Test Limits for Repeated FACCH/F sensitivity (VAMOS III MS, Corr=0.7, AGI=-6 dB)

GSM 900 / 850

 

Channel

SCPIR_DL /dB

Clev
/dBm

Orig. BER requirement

Derived test limit

Target number of samples

FACCH/F

0

-101,5

0.05

0.0617

5592

GSM 1800 / 1900

FACCH/F

0

-102