14.2.18 Reference sensitivity – TCH/AHS

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

14.2.18.1 Definition

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

14.2.18.2 Conformance requirement

1. At reference sensitivity level, the TCH/AHS FER shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.

2 At reference sensitivity level, the TCH/AHS class Ib RBER (BFI=0) shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.

3 At reference sensitivity level, the TCH/AHS class II RBER (BFI=0) shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.

14.2.18.3 Test purpose

1. To verify that the MS does not exceed conformance requirement 1 under TUhigh propagation conditions with an allowance for the statistical significance of the test.

2. To verify that the MS does not exceed conformance requirement 2 under TUhigh propagation conditions with an allowance for the statistical significance of the test.

3. To verify that the MS does not exceed conformance requirement 3 under TUhigh, RA and HT propagation conditions with an allowance for the statistical significance of the test.

14.2.18.4 Method of test

14.2.18.4.1 Initial conditions

The BA list sent on the BCCH and SACCH indicates at least six surrounding cells, with at least one near to each band edge. It is not necessary to generate any of these BCCHs, but if provided, the signal strengths of BCCHs shall be in the range 15 dBVemf(  ) to 35 dBVemf(  ).

The ARFCN of any BCCH shall not be co-channel or on adjacent channels to the wanted traffic channel.

A call is set up according to the generic call set up procedure on a TCH/AHS with an ARFCN in the mid ARFCN range, power control level set to maximum power.

The multirate configuration indicates the use of a codec set limited to 5,15 kbit/s.

The SS transmits Standard Test Signal C1 on the traffic channel.

14.2.18.4.2 Procedure

a) The SS commands the MS to create traffic channel loop back signalling erased frames.

NOTE: Frames detected with BFI=1 are signalled as erased on the uplink.

b) The fading function is set to TUHigh.

c) The SS sets the amplitude of the wanted signal to reference sensitivity level ( ).

d) The SS compares the data of the signal that it sends 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 class II, by examining sequences of at least the minimum number of samples of consecutive bits of class II. Bits are taken only from those frames not signalled as erased.

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

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

h) The SS uses a Channel Mode Modify procedure to change the active codec set to 4,75 kbit/s and steps d) to g) are repeated.

i) The fading function is set to HT.

j) The SS uses a Channel Mode Modify procedure to change the active codec set to 7,4 kbit/s and steps d) to g) are repeated.

k) The SS uses a Channel Mode Modify procedure to change the active codec set to 5,9 kbit/s and steps d) to g) are repeated.

l) The fading function is set to RA.

m) The SS uses a Channel Mode Modify procedure to change the active codec set to 7,95 kbit/s and steps d) to g) are repeated.

n) The SS uses a Channel Mode Modify procedure to change the active codec set to 6,7 kbit/s and steps d) to g) are repeated.

Maximum/Minimum Duration of Test

Pre Rel-5 MS

Maximum: 24 minutes (GSM850), 23 minutes (GSM900), 15 minutes (DCS1800, PCS1900).

Minimum: 23 minutes (GSM850), 22 minutes (GSM900), 12 minutes (DCS1800, PCS1900).

Rel -5 onwards MS

Maximum: 24 minutes (GSM850), 23 minutes (GSM900), 17 minutes (DCS1800, PCS1900).

Minimum: 23 minutes (GSM850), 22 minutes (GSM900), 12 minutes (DCS1800, PCS1900).

14.2.18.5 Test requirements

Testing the reference sensitivity performance is performed using statistical methods that lead to an early pass/fail decision with test time significantly reduced for MS with BER/BLER not on the limit.

For more information on statistical testing of BER/BLER performance, especially the definition of limit lines refer to Annex 6.2

Wrong decision risk F for one single error rate test:

Fpass   =   Ffail   =   F and F   =   0.2%

Wrong decision probability D per test step:

Dpass   =   Dfail   =   D and D   =   0.0085%

Parameters for limit lines:

1. D =  0.000085 wrong decision probability per test step.

2. M =   1.5 bad DUT factor

3. ne number of (error) events. This parameter is the x‑ordinate in figure 14‑1.

4. ns number of samples. The error rate is calculated from ne and ns.

Limit checking

Before limit checking is valid the minimum test time due to fading needs to be considered:

Testing under multipath and interference conditions requires that at least 990 wavelengths are crossed with the speed given in the fading profile. This leads to a minimum test time depending on the frequency range. No early pass/fail decision is allowed until the minimum test time due to fading has elapsed.

Table 14-39: Minimum test times due to TU high fading conditions

Half Rate 50 km/h

Frequency

0,4

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,75

0,43

0,35

0,33

0,17

0,16

m

min test time

855

489

403

380

190

180

s

0:14:15

0:08:09

0:06:43

0:06:20

0:03:10

0:03:00

hh.mm:ss

Table 14-40: Minimum test times due to HT 100 fading conditions

Half Rate 100 km/h

Frequency

0,4

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,75

0,43

0,35

0,33

0,17

0,16

m

min test time

428

244

201

190

95

90

s

0:07:08

0:04:04

0:03:21

0:03:10

0:01:35

0:01:30

Table 14-x: Minimum test times due to RA 130 fading conditions

Half Rate 130 km/h

Frequency

0,4

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,75

0,43

0,35

0,33

0,17

0,16

m

min test time

73

69

s

0:01:13

0:01:09

Table 14-41: Minimum test times due to RA 250 fading conditions

Half Rate 250 km/h

Frequency

0,4

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,75

0,43

0,35

0,33

0,17

0,16

m

min test time

171

98

81

76

s

0:02:51

0:01:38

0:01:21

0:01:16

hh:mm:ss

If the minimum test time due to multipath conditions exceeds the target test time, then the test runs for the minimum test time due to multipath conditions and the decision is done by comparing the result with the “derived test limit”. In this case early pass/fail decisions are obsolete.

If the target test time exceeds the minimum test time due to multipath conditions early pass/fail decisions can be headed for in order to accelerate test execution.

For an early decision a minimum number of (error) events is necessary.

For an early pass decision ne   ≥   1 (inclusive artificial error)

For an early fail decision ne   ≥   7

When the target test time has been reached the test is finished and a pass/fail decision can be made.

The error rates measured for different channels and under the different propagation conditions, shall be tested according to the values given in table 14-42 or 14-43.

Table 14-42: Statistical test limits for GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900: fading TU high

TU high no FH

0.4 to 0.9GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

class II per s

AHS 5.15

frames

5150

50

0,025000

0,030850

11183

224

00:03:44

Class1b

5150

2100

0,005100

0,006293

54819

26

00:00:26

Class II

5150

600

0,063000

0,077742

4438

7

00:00:07

AHS 4.75

frames

4750

50

0,012000

0,014808

23298

466

00:07:46

Class1b

4750

2200

0,001700

0,002098

164458

75

00:01:15

Class II

4750

600

0,064000

0,078976

4368

7

00:00:07

Table 14-43: Statistical test limits for GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900: fading RA 250

RA 250 no FH

0.4 to 0.9GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

clas II per s

AHS 7.95

frames

7950

50

Class1b

7950

2800

Class II

7950

1800

Pre Rel-5:

0,059000

Rel-5:

0,047000

Pre Rel-5:

0,072806

Rel-5:

0,057998

Pre Rel-5:

4739

Rel-5:

5948

Pre Rel-5:

3

Rel-5:

3

Pre Rel-5:

00:00:03

Rel-5:

00:00:03

AHS 6.7

frames

6700

50

Class1b

6700

2750

Class II

6700

1200

Pre Rel-5:

0,065000

Rel-5:

0,055000

Pre Rel-5:

0,080210

Rel-5:

0,067870

Pre Rel-5:

4302

Rel-5:

5083

Pre Rel-5:

4

Rel-5:

4

Pre Rel-5:

00:00:04

Rel-5:

00:00:04

Table 14-44: Statistical test limits for GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900: fading HT 100

HT 100 no FH

0.4 to 0.9GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

clas II per s

AHS 7.4

frames

7400

50

Class1b

7400

2950

Class II

7400

1400

Pre Rel-5:

0,069000

Rel-5:

0,060000

Pre Rel-5:

0,085146

Rel-5:

0,074040

Pre Rel-5:

4052

Rel-5:

4660

Pre Rel-5:

3

Rel-5:

3

Pre Rel-5:

00:00:03

Rel-5:

00:00:03

AHS 5.9

frames

5900

50

Class1b

5900

2350

Class II

5900

800

Pre Rel-5:

0,083000

Rel-5:

0,068000

Pre Rel-5:

0.102422

Rel-5:

0,083912

Pre Rel-5:

3369

Rel-5:

4111

Pre Rel-5:

4

Rel-5:

5

Pre Rel-5:

00:00:04

Rel-5:

00:00:05

Table 14-45: Statistical test limits for DCS 1 800 and PCS 1 900 sensitivity: fading TU high

TU high no FH

1.8 and 1.9 GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

class II per s

AHS 5.15

frames

5150

50

0,026000

0,032084

10753

215

00:03:35

Class1b

5150

2100

0,005300

0,006540

52751

25

00:00:25

Class II

5150

600

0,063000

0,077742

4438

7

00:00:07

AHS 4.75

frames

4750

50

Pre Rel-5:

0,017000

Rel-5:

0,012000

Pre Rel-5:

0,020978

Rel-5:

0,014808

Pre Rel-5:

16446

Rel-5:

23298

Pre Rel-5:

329

Rel-5:

466

Pre Rel-5:

00:05:29

Rel-5:

00:07:46

Class1b

4750

2200

Pre Rel-5:

0,002500

Rel-5:

0,001800

Pre Rel-5:

0,003085

Rel-5:

0,002221

Pre Rel-5:

111832

Rel-5:

155321

Pre Rel-5:

51

Rel-5:

71

Pre Rel-5:

00:00:51

Rel-5:

00:01:11

Class II

4750

600

0,065000

0,080210

4301

7

00:00:07

Table 14-46: Statistical test limits for DCS 1 800 and PCS 1 900 sensitivity: fading RA 130

RA 130 no FH

1.8 and 1.9 GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

clas II per s

AHS 7.95

frames

7950

50

Class1b

7950

2800

Class II

7950

1800

Pre Rel-5:

0,059000

Rel-5:

0,048000

Pre Rel-5:

0,072806

Rel-5:

0,059232

Pre Rel-5:

4739

Rel-5:

5825

Pre Rel-5:

3

Rel-5:

3

Pre Rel-5:

00:00:03

Rel-5:

00:00:03

AHS 6.7

frames

6700

50

Class1b

6700

2750

Class II

6700

1250

Pre Rel-5:

0,065000

Rel-5:

0,055000

Pre Rel-5:

0,080210

Rel-5:

0,067870

Pre Rel-5:

4302

Rel-5:

5083

Pre Rel-5:

3

Rel-5:

4

Pre Rel-5:

00:00:03

Rel-5:

00:00:04

Table 14-47: Statistical test limits for DCS 1 800 and PCS 1 900 sensitivity: fading HT 100

HT 100 no FH

1.8 and 1.9 GHz

frames per s

Orig. BER

Derived

Target number

Target test

Target test time

clas1b per s

requirement

test limit

of samples

time (s)

(hh:mm:ss)

Channel

bits per sec

clas II per s

AHS 7.4

frames

7400

50

Class1b

7400

2950

Class II

7400

1400

Pre Rel-5:

0,071000

Rel-5:

0,060000

Pre Rel-5:

0,087614

Rel-5:

0,074040

Pre Rel-5:

3938

Rel-5:

4660

Pre Rel-5:

3

Rel-5:

3

Pre Rel-5:

00:00:03

Rel-5:

00:00:03

AHS 5.9

frames

5900

50

Class1b

5900

2350

Class II

5900

800

Pre Rel-5:

0,084000

Rel-5:

0,068000

Pre Rel-5:

0,103656

Rel-5:

0,083912

Pre Rel-5:

3329

Rel-5:

4111

Pre Rel-5:

4

Rel-5:

5

Pre Rel-5:

00:00:04

Rel-5:

00:00:05