14.18.6 EGPRS Usable receiver input level range

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

14.18.6.1 Definition

The usable receiver input level range is the range of the radio frequency input level of a specified modulated signal over which bit error ratio stay between specified limits.

14.18.6.2 Conformance requirement

1. The receiver input level range requirements of 3GPP TS 05.05 subclause 6.1 for raw data bits of GMSK modulation under static and EQ propagation conditions shall be met:

1.1 Under normal conditions.

1.2 Under extreme conditions.

2. The receiver input level range requirements of 3GPP TS 05.05 subclause 6.1 for raw data bits of 8PSK modulation under static condition shall be met:

2.1 Under normal conditions.

2.2 Under extreme conditions.

3. The receiver input level range requirements of 3GPP TS 05.05 subclause 6.1 for raw data bits of 8PSK modulation with random frequency offset under static condition shall be met:

3.1 Under normal conditions.

3.2 Under extreme conditions.

14.18.6.3 Test purpose

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

1.1 Under normal conditions.

1.2 Under extreme conditions.

14.18.6.4 Test Method

Initial Conditions

The MS is assumed to be EGPRS attached. The power control parameter ALPHA (α) is set to 0.

The SS establishes a downlink TBF on one timeslot.

The SS commands the MS to request an establishment of the TBF Uplink and to create a channel loop back after demodulation and before decoding. This is achieved by the EGPRS Switched Radio Loopback Mode (3GPP TS 04.14/44.014, subclause 5.5)

Test Procedure

For GMSK Modulation:

a) The SS shall transmit the pseudo-random data using the standard GMSK-modulated test signal in the Mid ARFCN range and the input level at the receiver input shall be 20 dB above the Reference Sensitivity Level.

b) The SS compares the data that it sends to the MS with the data which is looped back from the receiver after demodulation and before decoding.

The SS tests the bit error ratio for the data bits, by examining sequences of at least the minimum number of samples specified in the test requirements. The number of error events is recorded.

c) Step b) is repeated with the input level at the receiver input increased to 73 dBVemf().

d) Step b) is repeated with the input level at the receiver input increased to the following values:

For GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900: 98 dBVemf().

For DCS 1 800 and PCS 1 900: 90 dBVemf().

e) The SS fading function is set to EQ.

f) Step b) is repeated with the input level at the receiver input set to 20dB above the reference sensitivity level() and then increased to 73 dBVemf().

g) Steps a) to f) are repeated under extreme test conditions.

For 8PSK Modulation:

a) The SS shall transmit the pseudo-random data using the standard 8PSK-modulated test signal in the Mid ARFCN range and the input level at the receiver input shall be -82 dBm, which level is subject to adjustment according to correction table in subclause 6.2. of 3GPP TS 05.05/45.005. For an EGPRS MS that only supports GMSK modulation in the uplink, a GMSK-modulated signal will be used for UL transmission.

b) The SS compares the data that it sends to the MS with the data which is looped back from the receiver after demodulation and before decoding.

The SS tests the bit error ratio for the data bits, by examining sequences of at least the minimum number of samples specified in the test requirements. The number of error events is recorded.

c) Step b) is repeated with the input level at the receiver input increased to 73 dBVemf().

d) Step b) is repeated with the input level at the receiver input increased to 87 dBVemf().

e) Steps a) to d) are repeated under extreme test conditions.

For 8PSK Modulation with random frequency offset:

a) The SS shall transmit the pseudo-random data using the standard 8PSK-modulated test signal in the Mid ARFCN range and the input level at the receiver input shall be -82 dBm, which level is subject to adjustment according to correction table in subclause 6.2. of 3GPP TS 05.05/45.005. The 8-PSK modulated test signal is randomly offset, on a burst-by-burst basis, by a frequency offset of +/- 0,1ppm. For each burst, the sign of the frequency offset is chosen according to a 511-bit pseudo-random sequence, defined in ITU-T Recommendation O.153. For an EGPRS MS that only supports GMSK modulation in the uplink, a GMSK-modulated signal will be used for UL transmission.

b) The SS compares the data that it sends to the MS with the data which is looped back from the receiver after demodulation and before decoding.

The SS tests the bit error ratio for the data bits, by examining sequences of at least the minimum number of samples specified in the test requirements. The number of error events is recorded.

c) Step b) is repeated with the input level at the receiver input increased to 73 dBµVemf().

d) Step a) to c) are repeated under extreme test conditions.

14.18.6.5 Test Requirements

The error rate measured in this test shall not exceed the test limit error rate values given in table 14.18-10. This shall apply for any combination of normal and extreme test voltages and ambient temperature, for the different propagation conditions and for any level of input signal to the receiver.

Table 14.18-10: Limits for input level range

GSM 400, GSM 700,

T-GSM 810, GSM 850 and GSM 900

DCS 1 800 and PCS 1 900

Type of test signals

Type of measurement

Propagation Conditions

Test limit Error rate %

Minimum No. of samples

Test limit Error rate %

Minimum No. of samples

GMSK

BER

Static <= 73dBVemf()

Static <= 98dBVemf()

Static <= 90dBVemf()

EQ

0,012

0,122

3,25

1 640 000

164 000

120 000

0,012

0,122

3,25

1 640 000

164 000

60000

8PSK

BER

Static<= 73dBVemf()

Static <= 87dBµVemf()

0,012

0,122

1 640 000

164 000

0,012

0,122

1 640 000

164 000

8PSK with frequency offset within 0,1 ppm

BER

Static <=

73dBµVemf()

0,012

1 640 000

0,122

164 000