14.18.3e Adjacent channel rejection in EC-GSM-IoT Configuration
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
14.18.3e.1 Definition
The adjacent channel selectivity is a measure of the capability of the receiver to receive wanted data packets without exceeding a given degradation due to the presence of an interfering signal (I1) in the adjacent channel. "Wanted signal" in this test is the signal generated by the transmitted RLC data blocks.
The adjacent channel can be the adjacent in the RF spectrum or in time. There are therefore two types of adjacent channel selectivity:
1) Adjacent RF channel selectivity which is specifically tested in this subclause.
2) Adjacent Time Slot selectivity, which is implicitly tested in test 14.18.2.
14.18.3e.2 Conformance requirement
1. For GMSK modulation, under adjacent channel interference at 200 kHz above and below the wanted signal frequency and at the adjacent interference ratio (C/Ia1) specified in table 14.18.3e.2-1.
1.1 For a TU1.2 faded wanted signal and a RA250 in case low band (or RA130 for high band) adjacent channel interferer, The block error rate (BLER) performance for EC-PDTCH/MCS-1 to 1/16 shall not exceed 20 %; 3GPP TS 45.005, subclause 6.2.
1.2 For a TU1.2 faded wanted signal and a RA250 in case low band (or RA130 for high band) adjacent channel interferer, The block error rate (BLER) performance for EC-CCCH/D/32 (EC-PCH) shall not exceed 10 %; 3GPP TS 45.005, subclause 6.2.
1.3 For a TU1.2 faded wanted signal and a RA250 in case low band (or RA130 for high band) adjacent channel interferer, The block error rate (BLER) performance for EC-PACCH/D/16 shall not exceed 10 %; 3GPP TS 45.005, subclause 6.2.
Table 14.18.3e.2-1: Adjacent channel interference ratio at reference performance (for EC-GSM-IoT MS) for GMSK modulated signals
|
E-GSM 900 and GSM 850 |
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|
Type of |
Propagation conditions |
||||
|
Channel |
TU1.2 (no FH) |
TU1.21) (ideal FH) |
TU50 (no FH) |
||
|
EC-SCH |
– |
dB |
-28.5 |
– |
-30.0 |
|
EC-BCCH |
– |
dB |
-31.0 |
– |
-32.5 |
|
EC-PACCH/D |
CC1 |
dB |
-18.5 |
-23.0 |
-22.0 |
|
EC-PACCH/D/4 |
CC2 |
dB |
-21.0 |
-26.5 |
-25.5 |
|
EC-PACCH/D/8 |
CC3 |
dB |
-22.0 |
-29.0 |
-28.0 |
|
EC-PACCH/D/16 |
CC4 |
dB |
-23.5 |
-30.5 |
-30.0 |
|
EC-CCCH/D2) |
CC1 |
dB |
-15.0 |
– |
-17.5 |
|
EC-CCCH/D/8 |
CC2 |
dB |
-24.0 |
– |
-27.5 |
|
EC-CCCH/D/16 |
CC3 |
dB |
-25.0 |
– |
-29.0 |
|
EC-CCCH/D/32 |
CC4 |
dB |
-27.5 |
– |
-30.5 |
|
EC-PDTCH/MCS-14) |
CC1 |
dB |
-20.0 |
-21.5 |
-21.5 |
|
EC-PDTCH/MCS-1/4 |
CC2 |
dB |
-24.0 |
-26.0 |
-25.5 |
|
EC-PDTCH/MCS-1/8 |
CC3 |
dB |
-26.0 |
-29.5 |
-29.0 |
|
EC-PDTCH/MCS-1/16 |
CC4 |
dB |
-27.5 |
-32.0 |
-32.0 |
|
DCS 1800 and PCS 1900 |
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|
Type of |
Propagation conditions |
||||
|
Channel |
TU1.2 (no FH) |
TU1.21) (Ideal FH) |
TU50 (no FH) |
||
|
EC-SCH |
– |
dB |
-29.0 |
– |
-30.5 |
|
EC-BCCH |
– |
dB |
-32.0 |
– |
-33.0 |
|
EC-PACCH/D |
CC1 |
dB |
-18.0 |
-23.0 |
-23.0 |
|
EC-PACCH/D/4 |
CC2 |
dB |
-21.0 |
-26.5 |
-26.5 |
|
EC-PACCH/D/8 |
CC3 |
dB |
-22.5 |
-29.0 |
-28.5 |
|
EC-PACCH/D/16 |
CC4 |
dB |
-24.0 |
-30.5 |
-30.5 |
|
EC-CCCH/D2) |
CC1 |
dB |
-15.5 |
– |
-18.5 |
|
EC-CCCH/D/8 |
CC2 |
dB |
-24.5 |
– |
-27.5 |
|
EC-CCCH/D/16 |
CC3 |
dB |
-25.5 |
– |
-29.5 |
|
EC-CCCH/D/32 |
CC4 |
dB |
-28.5 |
– |
-31.0 |
|
EC-PDTCH/MCS-14) |
CC1 |
dB |
-20.0 |
-21.5 |
-21.5 |
|
EC-PDTCH/MCS-1/4 |
CC2 |
dB |
-24.0 |
-26.0 |
-26.0 |
|
EC-PDTCH/MCS-1/8 |
CC3 |
dB |
-26.0 |
-29.5 |
-29.5 |
|
EC-PDTCH/MCS-1/16 |
CC4 |
dB |
-28.0 |
-32.0 |
-32.0 |
|
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 table 6.3-1a and subclause 6.3.4. |
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3GPP TS 45.005, table 2am and subclause 6.3.
2. The BLER shall not exceed the conformance requirements given in 1. under extreme conditions; 3GPP TS 45.005, subclause 6.2 and annex D subclauses D.2.1 and D.2.2.
14.18.3e.3 Test purpose
1 To verify that the conformance requirements 1.1 are met with an allowance for the statistical significance of the test in the presence of a GMSK and 8PSK modulated adjacent channel interferer under propagation condition RA250 in low band (and RA130 in high band) at 200 kHz above and below the wanted signal frequency.
2. To verify that Conformance Requirements are met under extreme conditions.
14.18.3e.4 Method of test
Initial conditions
For GMSK, 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 the wanted test signal, the SS transmits an independent, uncorrelated interfering signal Standard Test Signal (I1). This unwanted signal is random, continuous and GMSK-modulated, and has no fixed relationship with the bit transitions of the wanted signal.
The fading characteristic of the wanted signal is TU1.2/noFH and RA250/noFH in low band (or RA130/noFH for high band) for the interfering signal.
Specific PICS 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 SS transmits the unwanted signal at a nominal frequency 200kHz above or below the nominal frequency of the wanted signal. Its amplitude is set to achieve the adjacent interference ratio 1dB above that specified in the conformance requirements.
c) 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 Packet Downlink Ack/Nack as sent from the MS to the SS on the EC-PACCH.
d) Once the number of blocks transmitted with the current coding scheme as counted in step c) 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.
e) The SS repeats steps b) to d) for each of the coding schemes MCS-1/4 CC2, MCS-1/8 CC3 and MCS-1/16 CC4.
f) The SS establishes the normal test conditions.
g) The SS transmits the unwanted signal at a nominal frequency 200kHz above or below the nominal frequency of the wanted signal. Its amplitude is set to achieve the adjacent interference ratio 1dB above that specified in the conformance requirements.
h) The SS transmits paging (EC-PCH) on EC-CCCH/D/32 to the MS
i) The SS counts the number of times the MS responds the paging, and the number of times does not respond.
j) Once the number of paging the MS as counted in step i) 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.
k) The SS establishes the normal test conditions.
l) The SS transmits the unwanted signal at a nominal frequency 200kHz above or below the nominal frequency of the wanted signal. Its amplitude is set to achieve the adjacent interference ratio 1dB above that specified in the conformance requirements.
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.
p) The SS repeats steps a) to d) under extreme test conditions for MCS-1/16 CC4 coding scheme only.
14.18.3e.5 Test requirements
The block error ratio, as calculated by the SS for different channels with different coding schemes and under TU1.2 propagation condition, under any combination of normal and extreme test voltages and ambient temperatures, shall not exceed the conformance requirement.
14.18.3e.5.1 Fixed limit test with minimum number of samples
The fixed testing of the conformance requirement is done using the minimum number of samples and the limit BLER given in table 14.18‑2.
14.18.3e.5.2 Statistical test with early pass / fail decision
Specific details on statistical testing of BER/BLER performance are defined in Annex 7.
Minimum test time due to fading conditions has to be considered before checking the conformance limits. The minimum test time for the specific fading condition are specified in the table 14.18.3e.5-1.
Table 14.18.3e.5-1: Minimum test time due to TU 1.2 fading conditions
|
TU 1.2 |
|||||
|
Frequency /MHz |
850 |
900 |
1800 |
1900 |
|
|
Wave length / m |
0,35 |
0,33 |
0,17 |
0,16 |
|
|
Min. Test time /s |
2115 |
1999 |
1000 |
947 |
|
|
hh:mm:ss |
00:35:15 |
00:33:19 |
00:16:40 |
00:15:47 |
|