14.2.26 Reference sensitivity – Repeated SACCH

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

14.2.26.1 Definition

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

14.2.26.2 Conformance requirement.

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, 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, 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.

The reference performance for Repeated Downlink FACCH and Repeated SACCH shall be FER £ 5%.

3GPP TS 45.005 subclause 6.2.

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.

The reference performance levels for Repeated Downlink FACCH and Repeated SACCH shall be corrected according to the values in the table below, describing the reference performance level correction factors for packet switched channels:

MS, GMSK modulated signals

for DCS 1 800 class 1 or class 2 MS

+2/+4 dB**

for DCS 1 800 class 3 MS

+2 dB

for GSM 400 small MS, GSM 900 small MS GSM 850 small MS and GSM 700 small MS

+2 dB

for other GSM 400, GSM 900 MS and GSM 850 MS and GSM 700 MS

0 dB

for PCS 1900 class 1 or class 2 MS

+2 dB

for other PCS 1900 MS

0 dB

** For DCS 1 800 class 1 and class 2 MS, a correction offset of +2dB shall apply for the reference sensitivity performance as specified in table 1a for the normal conditions defined in Annex D and an offset of +4 dB shall be used to determine all other MS performances.

3GPP TS 45.005 subclause 6.2

For T-GSM 810 the requirements for GSM 900 shall apply, apart for those parameters for which a separate requirement exists.

3GPP TS 45.005 subclause 2.

14.2.26.3 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.

14.2.26.4 Method of test

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

14.2.26.4.1 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 is set to maximum power.

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 14.2.26-1 for the duration of the test.

The SS transmits Standard Test Signal C1 on the traffic channel

14.2.26.4.2 Procedure

a) The fading function is set to TUhigh/NoFH.

b) The SS sets the amplitude of the wanted signal to –104dBm + Corr, (where Corr is the correction factor from the table above).

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 14.2.26-1.

i) The first two columns of Table 14.2.26-1 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 14.2.26-1: 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

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.

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

Maximum/Minimum Duration of Test (hh:mm)

Maximum: 02:43 (GSM700)

Minimum: 01:12 (PCS 1900)

14.2.26.5 Test Requirements

The error rates measured shall not exceed the test limit error rate values given in table 14.2.26-2.

For more information on statistical testing of FER performance, especially the definitions of limit lines refer to Annex A7.

Table 14.2.25-1: Minimum test times due to TU high fading conditions

Full Rate 50 km/h

Frequency

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,35

0,33

0,17

0,16

m

min test time

9676

9138

4569

4329

s

02:41:16

02:32:18

01:16:09

01:12:09

hh:mm:ss

Full Rate 60 km/h

Frequency

0,7

0,85

0,9

1,8

1,9

GHz

Wavelength

0,43

m

min test time

9791

s

02:43:11

hh:mm:ss

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

Table 14.2.26-2: Test Limits for Repeated SACCH sensitivity

Channel

Type of measurement

Propagation condition

Original

FER requirement

Derived test limit %

Target number of samples

SACCH

FER

TUhigh/No FH

5,00

6,17

5592

Table 14.2.26-3: Maximum test times

Maximum test time (best rate 2/2 per second) (s)

Maximum test time (best rate 2/2 per second) (hh:mm:ss)

5368

01:29:28