14.2.18a Reference sensitivity – TCH/AHS in TIGHTER configuration

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

14.2.18a.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.

14.2.18a.2 Conformance requirement

3GPP TS 45.005 subclause 6.2.5

The reference performance for Tightened Link Level Performance (TIGHTER) specified in table 1w, shall be

For speech channels (TCH/FS, TCH/HS, TCH/EFS, TCH/AFSx, TCH/AHSx, TCH/WFSx ) 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 1w at the corresponding signal level in dBm. The reference sensitivity level in section 6.2.1 shall be applied for TIGHTER MS.

14.2.18a.3 Test purpose

1. For TCH AHS/FER, MS shall meet the reference sensitivity performance mentioned in 3GPP TS 45.005 sub clause 6.2.5, for reference sensitivity level mentioned in Table 1w according to propagation conditions.

2. At reference sensitivity level, the TCH/AHS class Ib RBER (BFI=0) shall meet the performance mentioned in table 1w in 3GPP TS 45.005.

3. At reference sensitivity level, the TCH/AHS class II RBER (BFI=0) shall meet the performance mentioned in table 1w in 3GPP TS 45.005.

14.2.18a.4 Method of test

14.2.18a.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.

14.2.18a.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 as defined in Table 1w.

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 e) 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 e) 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 e) 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 e) are repeated.

Maximum/Minimum Duration of Test

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

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

14.2.18a.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 14.2.18a.5-1: 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 14.2.18a.5-2: 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 14.2.18a.5-3: 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 14.2.18a.5-4: 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 tables below:

Table 14.2.18a.5-5: 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 14.2.18a.5-6: 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

0.0100

0.012340

27957

559

00:09:19

Class1b

7950

2800

0.0044

0.005429

63541

23

00:00:23

Class II

7950

1800

0.0191

0.023569

14638

8

00:00:08

AHS 6.7

frames

6700

50

0.0100

0.012340

27957

559

00:09:31

Class1b

6700

2750

0.0029

0.003578

96406

35

00:00:35

Class II

6700

1200

0.0342

0.042202

8175

7

00:00:07

Table 14.2.18a.5-7: 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

0.0100

0.012340

27957

559

00:09:19

Class1b

7400

2950

0.0023

0.002838

121556

41

00:00:41

Class II

7400

1400

0.0237

0.029245

11797

8

00:00:08

AHS 5.9

frames

5900

50

0.0100

0.012340

27957

559

00:09:31

Class1b

5900

2350

0.0017

0.002097

164458

70

00:01:10

Class II

5900

800

0.0408

0.050347

6852

9

00:00:09

Table 14.2.18a.5-8: Statistical test limits for DCS 1800 and PCS 1900 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

0,012000

0,014808

23298

466

00:07:46

Class1b

4750

2200

0,001800

0,002221

155321

71

00:01:11

Class II

4750

600

0,065000

0,080210

4301

7

00:00:07

Table 14.2.18a.5-9: Statistical test limits for DCS 1800 and PCS 1900 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

0.0100

0.012340

27957

559

00:09:19

Class1b

7950

2800

0,004

0.004936

69895

24

00:00:24

Class II

7950

1800

0,018

0.022221

15532

9

00:00:09

AHS 6.7

frames

6700

50

0.0100

0.012340

27957

559

00:09:19

Class1b

6700

2750

0,003

0.003702

93193

33

00:00:33

Class II

6700

1200

0,03

0.03702

9319

8

00:00:08

Table 14.2.18a.5-10: Statistical test limits for DCS 1800 and PCS 1900 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

0.0100

0.012340

27957

559

00:09:19

Class1b

7400

2950

0.0023

0.002838

121556

41

00:00:41

Class II

7400

1400

0.0258

0.031837

10836

8

00:00:08

AHS 5.9

frames

5900

50

0.0100

0.012340

27957

559

00:09:31

Class1b

5900

2350

0.0019

0.002344

147147

63

00:01:03

Class II

5900

800

0.0426

0.052568

6563

8

00:00:08