14.18.2b Co-channel rejection – in TIGHTER configuration

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

14.18.2b.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.

14.18.2b.2 Conformance requirement

1.If MS indicating support for TIGHTER Capability (see 3GPP TS 24.008) shall also indicate support for DARP – phase I (see 3GPP TS 24.008), and shall fulfil the requirements in table 2ad for co channel interference (C/Ic)1. The block error rate (BLER) performance for PDTCH/MCS1 to 4 shall not exceed 10 % at co-channel interference ratios (C/Ic) exceeding those according to the table 14.18.2b-1; and for PDTCH/MCS5 to 9 shall not exceed 10 % or 30 % depending on Coding Schemes at co-channel interference ratios (C/Ic) exceeding those according to the table 14.18.2b-2.

Table 14.18.2b-1: PDTCH Co-channel Interference Ratio for GMSK modulation

Type of

Propagation conditions

channel

TUlow

(no FH)

TUhigh

(no FH)

TUhigh

(ideal FH)

RA

(no FH)

GSM 850 and GSM 900

PDTCH/MCS-1

dB

9

6,5

5,5

8

PDTCH/MCS-2

dB

11

8,5

8

10

PDTCH/MCS-3

dB

12,5

13

13

17

PDTCH/MCS-4

dB

15

18

18

(note)

DCS 1 800 and PCS 1 900

PDTCH/MCS-1

dB

10

7,5

6

8

PDTCH/MCS-2

dB

12

9,5

8,5

10

PDTCH/MCS-3

dB

13,5

14

13,5

17

PDTCH/MCS-4

dB

16

19

18,5

(note)

NOTE: PDTCH/MCS-4 can not meet the reference performance for some propagation condition.

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

Table 14.18.2b-2: Co channel interference ratio for MS
at reference performance for 8-PSK modulation

GSM 850 and GSM 900

Propagation conditions

Type of channel

TUlow

(no FH)

TUhigh

(no FH)

TUhigh

(ideal FH)

RA

(no FH)

PDTCH/MCS-5

dB

15,5

12

11

13,5

PDTCH/MCS-6

dB

17,5

14,5

145

18

PDTCH/MCS-7

dB

22,5

21,5

21

(note 1)

PDTCH/MCS-8

dB

26,5

22 (note 2)

22**

(note 1)

PDTCH/MCS-9

dB

21,5 (note 2)

27 (note 2)

27**

(note 1)

DCS 1800 and PCS 1 900

Propagation conditions

Type of channel

TUlow

(no FH)

TUhigh

(no FH)

TUhigh

(ideal FH)

RA

(no FH)

PDTCH/MCS-5

dB

16

11,5

11,5

13,5

PDTCH/MCS-6

dB

18

14,5

14,5

18

PDTCH/MCS-7

dB

23

24

24

(note 1)

PDTCH/MCS-8

dB

27

26 (note 2)

25 (note 2)

(note 1)

PDTCH/MCS-9

dB

22 (note 2)

(note 1)

(note 1)

(note 1)

NOTE 1: PDTCH/MCS-x can not meet the reference performance for some propagation condition.

NOTE 2: Performance is specified at 30% BLER for some cases.

3GPP TS 45.005, table 2ad and subclause 6.3.

2. The block error rate (BLER) performance for USF/MCS1 to 9 shall not exceed 1 % at co-channel interference ratios (C/Ic) exceeding those according to the tables 14.18.2b-3 and 14.18.2b-4.

Table 14.18.2b-3: USF Co-channel Interference Ratio for GMSK modulation

Type of

Propagation conditions

Channel

TUlow

(no FH)

TUhigh

(no FH)

TUhigh

(ideal FH)

RA

(no FH)

GSM 400, GSM 700, GSM 850 and GSM 900

USF/MCS-1 to 4

dB

18

11

9,5

9,5

DCS 1 800 and PCS 1 900

USF/MCS-1 to 4

dB

18

9,5

9,5

9,5

3GPP TS 45.005, tables 2a.

Table 14.18.2b-4: USF Co-channel Interference Ratio for 8-PSK modulation

Type of

Propagation conditions

channel

TUlow

(no FH)

TUhigh

(no FH)

TUhigh

(ideal FH)

RA

(no FH)

GSM 400, GSM 700, GSM 850 and GSM 900

USF/MCS-5 to 9

dB

17

11,5

9

9

DCS 1 800 and PCS 1 900

USF/MCS-5 to 9

dB

17

10

9

9

3GPP TS 45.005, Tables 2c,3GPP TS 45.005 subclause 2.

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

14.18.2b.3 Test purpose

1. To verify that the MS does not exceed conformance requirement 1 for different coding schemes and under different 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 propagation condition TUhigh/noFH, with an allowance for the statistical significance of the test.

14.18.2b.4 Method of test

Initial conditions

For both GMSK and 8-PSK modulations, 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 PDTCH using MCS-4 coding to the MS on all allocated timeslots.

b) The fading characteristic of the wanted signal and the interfering signal is TUlow, no FH applies.

c) The co-channel interference ratio is set to 1 dB above the ratio given in the table in conformance requirement 1. The interferer shall have the same frequency hopping sequence as the wanted signal, as well as be subject to the same fading profile.

d) 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 440.60, subclause 12.3) in the Packet Downlink Ack/Nack as sent from the MS to the SS on the PACCH.

NOTE 1: Due to the error rates related to the USF, the MS is likely to occasionally miss its USF for transmitting the Packet Downlink Ack/Nack. As this requirement is not verified in this part of the test, the SS then again assigns uplink resources so the MS can send this message.

e) 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.

f) The SS repeats the steps c) to e) for the coding schemes, MCS-2 with TUhigh/FH and for MCS-1 with RA/noFH.

g) The SS establishes the normal test conditions, and sets the fading function to TUhigh/noFH. An uplink TBF shall be established.

h) The SS sets the value of the USF/MCS-4 such as to allocate the uplink to the MS, using a co-channel interference ratio of 1 dB above the ratio given in the table in conformance requirement 2.

i) The SS counts the number of times the USF is allocated to the MS, and the number of times the MS does not transmit while being allocated the uplink.

j) Once the number of USF/MCS-4 allocating the uplink for the MS as counted in step j) 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.

For 8-PSK Modulation:

a) The SS transmits packets on PDTCH using MCS-8 coding to the MS on all allocated timeslots.

b) The fading characteristic of the wanted signal and the interfering signal is TUlow, no FH applies.

c) The co-channel interference ratio is set to 1 dB above the ratio given in the table in conformance requirement 1. The interferer shall have the same frequency hopping sequence as the wanted signal, as well as be subject to the same fading profile.

d) 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 04.60, subclause 12.3) in the Packet Downlink Ack/Nack as sent from the MS to the SS on the PACCH.

NOTE 2: Due to the error rates related to the USF, the MS is likely to occasionally miss its USF for transmitting the Packet Downlink Ack/Nack. As this requirement is not verified in this part of the test, the SS then again assigns uplink resources so the MS can send this message.

e) 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.

f) The SS repeats step c) to e) with the TUhigh/noFH fading condition.

g) The SS repeats steps c) to e) for MCS-9 with TUlow/NoFH, MCS-7 with TUhigh/noFH, MCS-6 with TUhigh/FH and MSC-5 with RA/noFH.

h) The SS sets the fading function to TUhigh/noFH. An uplink TBF shall be established.

i) The SS sets the value of the USF/MCS-9 such as to allocate the uplink to the MS, using a co-channel interference ratio of 1 dB above the ratio given in the table in conformance requirement 2.

j) The SS counts the number of times the USF is allocated to the MS, and the number of times the MS does not transmit while being allocated the uplink.

k) Once the number of USF/MCS-9 allocating the uplink for the MS as counted in step j) 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.

14.18.2b.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.