14.8 AM suppression
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
14.8.1 AM suppression – speech channels
14.8.1.1 Definition
AM suppression is a measure of the ability of the receiver to receive a modulated wanted input signal in the presence of an unwanted TDMA modulated interferer.
14.8.1.2 Conformance requirement
The reference sensitivity performance as specified in table 1 shall be met when the following signals are simultaneously input to the receiver:
– a useful signal at frequency f0, 3 dB above the reference sensitivity level as specified in 3GPP TS 05.05 subclause 5.2.
– a single frequency (f), in the relevant receive band, |f – f0| > 6MHz, which is an integer multiple of 200 kHz, a GSM TDMA signal modulated by any 148-bits subsequence of the 511-bits pseudo random bit sequence, defined in ITU-T Recommendation O.153 fascicle IV.4, at a level as defined in the table below. The interferer shall have one timeslot active and the frequency shall be at least 2 channels separated from any identified spurious responses. The transmitted bursts shall be synchronized to but, delayed in time between 61 and 86 bit periods relative to the bursts of the wanted signal. 3GPP TS 05.05, subclause 5.2.
|
MS type |
Signal level |
|
GSM 400 |
-31 dBm |
|
GSM 700 |
-31 dBm |
|
GSM 850 |
-31 dBm |
|
GSM 900 |
-31 dBm |
|
DCS 1 800 |
-29 / -31 dBm (note) |
|
PCS 1 900 |
-31 dBm |
|
NOTE: The –31 dBm level shall apply to DCS 1 800 class 1 and class 2 MS meeting the –102 dBm reference sensitivity level requirement according to 3GPP TS 05.05, subclause 6.2. |
|
3GPP TS 45.05 subclause 2:
For T-GSM 810 the requirements for GSM 900 shall apply, apart for those parameters for which a separate requirement exists.
14.8.1.3 Test purpose
To verify that the AM suppression performance of the MS meets the conformance requirement with an allowance for the statistical significance of the test.
14.8.1.4 Method of test
14.8.1.4.1 Initial conditions
A call is set up according to the generic call set up procedure, on a TCH/FS with an ARFCN in the mid ARFCN range. The power control level is set to maximum power.
The SS transmits standard Test Signal C1 on the traffic channel (TCH frequency FR).
The SS commands the MS to create traffic channel loop back signalling erased frames.
This test is performed after test 14.7.
14.8.1.4.2 Procedure
a) The SS produces a static wanted signal with an amplitude 4 dB above reference sensitivity level.
b) The SS produces an interfering signal as described below:
– static fading profile;
– at an in band frequency greater than 6 MHz separated from FR and separated by at least two ARFCNs from any spurious responses.
NOTE: Spurious responses are identified by test cases 14.7.1 and 14.7.2.
– at a level as described in table 14-32.
– GSM TDMA modulated by random data with one timeslot active.
– synchronized to, but delayed between 61 and 86 bit periods to the bursts of the wanted signal.
Table 14-32: Interferer signal level
|
MS type |
Signal level (dBVemf) |
|
GSM 400 |
82 |
|
GSM 700 |
82 |
|
T-GSM 810 |
82 |
|
GSM 850 |
82 |
|
GSM 900 |
82 |
|
DCS 1 800 |
82/84 |
|
PCS 1 900 |
82 |
|
NOTE: The 82 dBVemf (i.e. -31 dBm) level shall apply to DCS 1 800 class 1 and class 2 MS meeting the ‑102 dBm reference sensitivity level requirement according to 3GPP TS 05.05, subclause 6.2. |
|
c) The SS compares the data of the signal that it sends to the MS with the signal which is looped back from the receiver after demodulation and decoding, and checks the frame erasure indication.
d) The SS tests the RBER compliance of class II bits by examining at least the minimum number of samples of consecutive bits. Bits only taken from those frames which do not signal frame erasure. The number of error events is recorded.
14.8.1.5 Test requirements
The error rates measured in this test shall not exceed the test limit error rate values given in table 14.27.
Table 14-33: Limits for AM suppression
|
Channel |
Propagation conditions |
Type of measurement |
Test limit error rate % |
Minimum No. of samples |
|
TCH/FS Class II |
Static |
RBER |
2,439 |
8 200 |
14.8.2 AM suppression – control channels
14.8.2.1 Definition
AM suppression is a measure of the ability of the receiver to receive a modulated wanted input signal in the presence of an unwanted TDMA modulated interferer.
14.8.2.2 Conformance requirement
The reference sensitivity performance as specified in table 1 shall be met when the following signals are simultaneously input to the receiver:
– a useful signal at frequency f0, 3 dB above the reference sensitivity level as specified in 3GPP TS 05.05 subclause 5.2.
– a single frequency (f), in the relevant receive band, |f – f0| > 6MHz, which is an integer multiple of 200 kHz, a GSM TDMA signal modulated by any 148-bits subsequence of the 511-bits pseudo random bit sequence, defined in ITU-T Recommendation O.153 fascicle IV.4, at a level as defined in the table below. The interferer shall have one timeslot active and the frequency shall be at least 2 channels separated from any identified spurious responses. The transmitted bursts shall be synchronized to but, delayed in time between 61 and 86 bit periods relative to the bursts of the wanted signal. 3GPP TS 05.05, subclause 5.2.
|
MS type |
Signal level |
|
GSM 400 |
-31 dBm |
|
GSM 700 |
-31 dBm |
|
GSM 850 |
-31 dBm |
|
GSM 900 |
-31 dBm |
|
DCS 1 800 |
-29 / -31 dBm (note) |
|
PCS 1 900 |
-31 dBm |
|
NOTE: The –31 dBm level shall apply to DCS 1 800 class 1 and class 2 MS meeting the –102 dBm reference sensitivity level requirement according to 3GPP TS 05.05, subclause 6.2. |
|
3GPP TS 45.05 subclause 2:
For T-GSM 810 the requirements for GSM 900 shall apply, apart for those parameters for which a separate requirement exists.
14.8.2.3 Test purpose
To verify that the AM suppression performance of the MS meets the conformance requirement with an allowance for the statistical significance of the test.
14.8.2.4 Method of test
14.8.2.4.1 Initial conditions
A call is set up according to the generic call set up procedure, on a TCH with an ARFCN in the mid ARFCN range. The power control level is set to maximum power.
The SS transmits standard Test Signal C1 on the traffic channel (TCH frequency FR).
This test is performed after test 14.7.
14.8.2.4.2 Procedure
a) The SS produces a TUhigh wanted signal with an amplitude 4 dB above reference sensitivity level.
b) The SS produces an interfering signal as described below:
– static fading profile;
– t an in band frequency greater than 6 MHz separated from FR and separated by at least two ARFCNs from any spurious responses.
NOTE: Spurious responses are identified by test cases 14.7.1 and 14.7.2.
– at a level as described in table 14-34.
– GSM TDMA modulated by random data with one timeslot active.
– synchronized to, but delayed between 61 and 86 bit periods to the bursts of the wanted signal.
Table 14-34: Interferer signal level
|
MS type |
Signal level (dBVemf) |
|
GSM 400 |
82 |
|
GSM 700 |
82 |
|
T-GSM 810 |
82 |
|
GSM 850 |
82 |
|
GSM 900 |
82 |
|
DCS 1 800 |
82/84 |
|
PCS 1 900 |
82 |
|
NOTE: The 82 dBVemf (i.e. –31 dBm) level shall apply to DCS 1 800 class 1 and class 2 MS meeting the –102 dBm reference sensitivity level requirement according to 3GPP TS 05.05, subclause 6.2. |
|
c) The SS sends the status message. Due to interfering signals, the MS may not be able acknowledge the Layer 2 frame. Frame erasures are indicated by repeated L2 frames.
d) The SS determines the number of frame erasure events during at least the minimum number of samples. If a failure is indicated, it is noted and counted towards the allowed exemption total.
14.8.2.5 Test requirements
The error rates measured in this test shall not exceed the test limit error rate values given in table 14.35.
Table 14-35: Limits for AM suppression
|
GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900 |
DCS 1 800 and PCS 1 900 |
|||||
|
Channel |
Propagation |
Type of |
Test limit |
Minimum No. of max-samples |
Test limit |
Min No. of |
|
FACCH/F |
TUhigh/No FH |
FER |
8,961 |
6 696 |
4,368 |
13 736 |
14.8.3 AM suppression – packet channels
14.8.3.1 Definition
AM suppression is a measure of the ability of the receiver to receive a modulated wanted input signal in the presence of an unwanted TDMA modulated interferer.
14.8.3.2 Conformance requirement
The reference sensitivity performance as specified in tables 1, 1a, 1c and 1e, adjusted by the correction factors of table 6.2-4, shall be met when the following signals are simultaneously input to the receiver.
– A useful signal, modulated with the relevant supported modulation (GMSK or 8-PSK) and symbol rate, at frequency fo, 3 dB above the reference sensitivity level or input level for reference performance, whichever applicable, as specified in sub clause 6.2
– A single frequency (f), in the relevant receive band, |f – f0| > 6MHz, which is an integer multiple of 200 kHz, a GSM TDMA signal modulated by any 148-bits subsequence of the 511-bits pseudo random bit sequence, defined in ITU-T Recommendation O.153 fascicle IV.4, at a level as defined in the table below. The interferer shall have one timeslot active and the frequency shall be at least 2 channels separated from any identified spurious responses. The transmitted bursts shall be synchronized to but, delayed in time between 61 and 86 bit periods relative to the bursts of the wanted signal.
|
MS type |
Signal level |
|
GSM 400 |
-31 dBm |
|
GSM 700 |
-31 dBm |
|
GSM 850 |
-31 dBm |
|
GSM 900 |
-31 dBm |
|
DCS 1 800 |
-29 / -31 dBm (note) |
|
PCS 1 900 |
-31 dBm |
|
NOTE: The –31 dBm level shall apply to DCS 1 800 class 1 and class 2 MS meeting the –102 dBm reference sensitivity level requirement according to 3GPP TS 45.005, subclause 6.2. |
|
3GPP TS 45.005, subclause 5.2
The block error rate (BLER) performance for PDTCH/MCS5 to 9 shall not exceed 10 % or 30 % depending on Coding Schemes.
The block error rate (BLER) performance for USF/MCS5 shall not exceed 1 %.
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 6.2
14.8.3.3 Test purpose
To verify that the AM suppression performance of the MS meets the conformance requirements with an allowance for the statistical significance of the test.
14.8.3.4 Method of test
14.8.3.4.1 Initial conditions
For 8-PSK modulation a downlink TBF is set up according to the generic procedure specified in clause 50 for packet switched with an ARFCN in the Mid ARFCN range, power control level set to maximum. The power control parameter ALPHA (α) is set to 0. The MCS is set to MCS-5 and the SS shall transmit on the maximum number of receive timeslots.
For the USF BLER parts of the test case the test mode defined in GSM Rec. 4.14 (para 5.4) will be used for uplink TBF. If the MS is capable of both:
Mode (a) transmitting pseudo-random data sequence in RLC data blocks
Mode (b) transmitting looped-back RLC data blocks
then Mode (a) will be used.
If Mode (b) is used then the SS sends the pseudo-random data sequence specified for Mode (a) on the downlink for loopback on the uplink.
The SS transmits EGPRS RLC data blocks containing random data.
This test is performed after test 14.18.5.
14.8.3.4.2 Procedure
a) The SS produces a static wanted signal with an amplitude 4 dB above reference sensitivity level according 3GPP 45.005 table 1c.
b) The SS produces an interfering signal as described below:
– static fading profile;
– at an in band frequency greater than 6 MHz separated from FR and separated by at least two ARFCNs from any spurious responses.
NOTE: Spurious responses are identified by test case 14.18.5.
– at a level as described in table 14.8.3-1.
– GSM TDMA modulated by random data with one timeslot active.
– synchronized to, but delayed between 61 and 86 bit periods to the bursts of the wanted signal.
Table 14.8.3-1: Interferer signal level
|
MS type |
Signal level (dBVemf) |
|
GSM 400 |
82 |
|
GSM 700 |
82 |
|
T-GSM 810 |
82 |
|
GSM 850 |
82 |
|
GSM 900 |
82 |
|
DCS 1 800 |
82/84 |
|
PCS 1 900 |
82 |
|
NOTE: The 82 dBVemf (i.e. -31 dBm) level shall apply to DCS 1 800 class 1 and class 2 MS meeting the ‑102 dBm reference sensitivity level requirement according to 3GPP TS 05.05, subclause 6.2. |
|
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 04.60, 12.3) in the Packet Downlink Ack/Nack as sent from the MS to the SS on the PACCH.
d) The SS sets the value of the USF/MCS-5 according 3GPP 45.005 table 1c.
e) 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.
NOTE: 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 sent this message.
14.8.3.5 Test requirements
The error rates measured in this test shall not exceed the test limit error rate values given in table 14.8.3-2.
Table 14.8.3-2: Limits for AM suppression
|
Channel |
Propagation conditions |
Type of measurement |
Test limit error rate % |
Minimum No. of samples |
|
MCS-5 |
Static |
BLER |
10 |
2000 |
|
USF/MCS-5 |
Static |
BLER |
1 |
20 000 |