14.18.2d Co-channel rejection in EC-GSM-IoT Configuration

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

14.18.2d.1 Definition

The co-channel rejection is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of an unwanted modulated signal, both signals being at the nominal frequency of the receiver. "Wanted signal" in this test is the signal generated by the transmitted RLC data blocks.

14.18.2d.2 Conformance requirement

1. The block error rate (BLER) performance for EC-PDTCH/D shall not exceed 20 % at co-channel interference ratios (C/Ic) exceeding those according to the table 14.18.2d-1 for GMSK and table 14.18.2d-2 for 8-PSK.

Table 14.18.2d-1: Cochannel interference ratio at reference performance (for EC-GSM-IoT MS) for GMSK modulated signals

E-GSM 900 and GSM 850

Type of

Propagation conditions

Channel

TU1.2

(no FH)

TU1.21)

(ideal FH)

TU50

(no FH)

EC-SCH

dB

-12.0

-13.5

EC-BCCH

dB

-13.5

-15.0

EC-PACCH/D

CC1

dB

-1.5

-5.0

-4.0

EC-PACCH/D/4

CC2

dB

-5.5

-10.0

-9.0

EC-PACCH/D/8

CC3

dB

-6.5

-13.0

-12.0

EC-PACCH/D/16

CC4

dB

-8.0

-15.5

-15.0

EC-CCCH/D2)

CC1

dB

2.5

0.5

EC-CCCH/D/8

CC2

dB

-7.5

-10.5

EC-CCCH/D/16

CC3

dB

-9.0

-13.0

EC-CCCH/D/32

CC4

dB

-12.0

-15.0

EC-PDTCH/MCS-14)

CC1

dB

-1.5

-3.0

-2.5

EC-PDTCH/MCS-1/4

CC2

dB

-6.5

-8.0

-7.5

EC-PDTCH/MCS-1/8

CC3

dB

-8.5

-12.0

-11.5

EC-PDTCH/MCS-1/16

CC4

dB

-10.5

-14.5

-14.5

DCS 1800 and PCS 1900

Type of

Propagation conditions

Channel

TU1.2

(no FH)

TU1.21)

(Ideal FH)

TU50

(no FH)

EC-SCH

dB

-12.5

-13.5

EC-BCCH

dB

-14.0

-15.0

EC-PACCH/D

CC1

dB

-1.0

-5.0

-5.0

EC-PACCH/D/4

CC2

dB

-5.0

-10.0

-10.0

EC-PACCH/D/8

CC3

dB

-7.0

-13.0

-12.5

EC-PACCH/D/16

CC4

dB

-9.0

-15.5

-15.0

EC-CCCH/D2)

CC1

dB

2.0

0.5

EC-CCCH/D/8

CC2

dB

-7.5

-11.0

EC-CCCH/D/16

CC3

dB

-9.5

-13.5

EC-CCCH/D/32

CC4

dB

-13.0

-15.0

EC-PDTCH/MCS-14)

CC1

dB

-1.0

-2.5

-2.5

EC-PDTCH/MCS-1/4

CC2

dB

-6.5

-8.0

-8.0

EC-PDTCH/MCS-1/8

CC3

dB

-8.5

-11.5

-11.5

EC-PDTCH/MCS-1/16

CC4

dB

-10.5

-14.5

-14.5

NOTE 1: Ideal FH case assumes perfect decorrelation between bursts. This case may only be tested if such a decorrelation is ensured in the test

NOTE 2: The performance requirements for EC-CCCH apply for EC-PCH and EC‑AGCH.

NOTE 3: For the notation of EC-channels, see 3GPP TS 45.003.

NOTE 4: For MCS-2, MCS-3 and MCS-4 in CC1 the requirements in table 2a apply for TU3 (low band) and TU1,5 (high band) and TU50 (no FH) propagation conditions together with the conditions for EGPRS in subclause 6.3.4.

3GPP TS 45.005, table 2ai; 3GPP TS 45.005, subclause 6.3.

2. For packet switched and AMR-WB speech GMSK modulated channels the wanted input signal level shall be: -93 dBm + Ir + Corr, where:

Ir = the interference ratio according to tables 2a, table 2j, 2ah and 2ai for the packet switched, and AMR-WB speech channels respectively
Corr = the correction factor for reference performance according to table 6.2-4.

TS 45.005, subclause 6.3.4

3. The block error rate (BLER) performance for EC-CCCH/D shall not exceed 10 % at co-channel interference ratios (C/Ic) exceeding those according to the table 14.18.2d-1 for GMSK.

4. The block error rate (BLER) performance for EC-PACCH/D shall not exceed 10 % at co-channel interference ratios (C/Ic) exceeding those according to the table 14.18.2d-1 for GMSK.

14.18.2d.3 Test purpose

1. To verify that the MS does not exceed conformance requirement 1,2 3 and 4 for different coding schemes and under different propagation conditions with an allowance for the statistical significance of the test.

14.18.2d.4 Method of test

Initial conditions

A downlink TBF is set up according to the generic procedure specified in clause 40 for packet switched with an ARFCN in the mid ARFCN range, power control level set to maximum power. The power control parameter ALPHA (α) is set to 0.

The SS transmits EGPRS RLC data blocks containing random data. In addition to these data blocks, the SS produces an independent, uncorrelated interfering signal (I1).

Specific PICS statements:

PIXIT Statements:

Test procedure

For GMSK Modulation:

a) The SS transmits packets on EC-PDTCH using MCS-1 CC1 coding to the MS on all allocated timeslots.

b) The fading characteristic TU50, no FH of the wanted signal applies.

c) The fading characteristic RA250, no FH or RA130 no FH of the interfering signal applies for low band (GSM 900 and GSM 850) and high band (DCS 1800 and PCS 1900) respectively.

d) The co-channel interference ratio is set to 1 dB above the ratio given in the table in conformance requirement 1.

e) The SS counts the number of blocks transmitted with current coding scheme and the number of these blocks not acknowledged based on the content of the Ack/Nack Description information element (see 3GPP TS 44.060, subclause 12.3) in the EC Packet Downlink Ack/Nack as sent from the MS to the SS on the EC-PACCH.

f) Once the number of blocks transmitted with the current coding scheme as counted in step d) reaches or exceeds the minimum number of blocks as given in table 14-18-2, the SS calculates the Block error ratio. The SS resets both counters.

g) The SS repeats the steps d) to f) for the coding schemes, EC-PDTCH/MCS-1/4 CC2 with TU1.2 (Ideal FH) and for EC-PDTCH/MCS-1/8 CC3 with TU1.2 (no FH) and EC-PDTCH/MCS-1/16 CC4 with TU50/noFH fading characteristics for the wanted signal.

h) The SS establishes the normal test conditions, and sets the fading function to TU1.2/noFH.

i) The SS transmits paging (EC-PCH) on EC-CCCH/D/32 to the MS.

j) The SS counts the number of times the MS responds the paging, and the number of times does not respond.

k) Once the number of paging the MS as counted in step j) reaches or exceeds the minimum number of paging as given in table TBD, the SS calculates the Block error ratio. The SS resets both counters.

l) The SS establishes the normal test conditions, and sets the fading function to TU1.2/noFH.

m) The SS transmits EC PACKET POLLING REQUEST on EC-PACCH/D/16 to the MS

n) The SS counts the number of times the MS responds with EC PACKET CONTROL ACKNOWLEDGEMENT, and the number of times does not respond.

o) Once the number of messages the MS as counted in step n) reaches or exceeds the minimum number of messages as given in table TBD, the SS calculates the Block error ratio. The SS resets both counters.

14.18.2d.5 Test requirements

The block error ratio, as calculated by the SS for different channels and under the different propagation conditions, shall not exceed the conformance requirement.