ETSI TS 102 933-2 V1.2.1 (2011-12)

Railway Telecommunications (RT); GSM-R improved receiver parameters; Part 2: Radio conformance testing

RTS/RT-EGSM-R-003-2

General Information

• Status: Published
• Publication Date: 19-Dec-2011
• Technical Committee: RT EGSM-R - Extended-GSM-R
• Current Stage: 12 - Completion
• Due Date: 30-Dec-2011
• Completion Date: 20-Dec-2011

Standards Content (Sample)

Technical Specification
Railway Telecommunications (RT);
GSM-R improved receiver parameters;
Part 2: Radio conformance testing

2 ETSI TS 102 933-2 V1.2.1 (2011-12)

Reference
RTS/RT-EGSM-R-003-2
Keywords
ER-GSM, R-GSM
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ETSI
3 ETSI TS 102 933-2 V1.2.1 (2011-12)
Contents
Intellectual Property Rights . 4
Foreword . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Abbreviations . 6
4 Receiver . . 6
4.1 Reference sensitivity . 6
4.2 Intermodulation rejection . 7
4.2.1 Intermodulation rejection - speech channels . 7
4.2.1.1 Definition and applicability . 7
4.2.1.2 Conformance requirement . 7
4.2.1.3 Test purpose . 7
4.2.1.4 Method of test . 7
4.2.1.4.1 Initial conditions . 7
4.2.1.4.2 Procedure . 7
4.2.1.5 Test requirements . 8
4.2.2 Intermodulation rejection - control channels . 8
4.2.2.1 Definition and applicability . 8
4.2.2.2 Conformance requirement . 8
4.2.2.3 Test purpose . 8
4.2.2.4 Method of test . 8
4.2.2.4.1 Initial conditions . 9
4.2.2.4.2 Procedure . 9
4.2.2.5 Test requirements . 9
4.2.3 Blocking and spurious response - speech channels for professional MS supporting the R-GSM 900
and ER-GSM 900 band . 10
4.2.3.1 Definition and applicability . 10
4.2.3.2 Conformance requirement . 10
4.2.3.3 Test purpose . 10
4.2.3.4 Method of test . 10
4.2.3.4.1 Initial conditions . 10
4.2.3.4.2 Procedure . 11
4.2.3.5 Test requirements . 12
4.2.4 Blocking and spurious response - control channels for professional MS supporting the R-GSM and
ER-GSM band . 13
4.2.4.1 Definition and applicability . 13
4.2.4.2 Conformance requirement . 13
4.2.4.3 Test purpose . 13
4.2.4.4 Method of test . 13
4.2.4.4.1 Initial conditions . 13
4.2.4.4.2 Procedure . 14
Annex A (informative): Bibliography . 17
History . 18

ETSI
4 ETSI TS 102 933-2 V1.2.1 (2011-12)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Railway Telecommunications
(RT).
The present document is part 2 of a multi-part deliverable covering the Railway Telecommunications (RT); GSM-R
improved receiver parameters, as identified below:
Part 1: "Requirements for radio reception";
Part 2: "Radio conformance testing".
ETSI
5 ETSI TS 102 933-2 V1.2.1 (2011-12)
1 Scope
The present document describes the technical characteristics and methods of testing the improved receiver performance
for professional mobile stations (professional MS), for the Pan European digital cellular communications system and
Personal Communication Systems (PCS) operating in the 900 MHz band (GSM 900), standardized by ETSI Special
Mobile Group (SMG).
The present document is valid for professional MS implemented according Phase 2+ R99.
The present document covers the requirements for testing the improved GSM-R receiver in order to provide sufficient
performance for mobile equipment.
It does not necessarily include all the characteristics which may be required by a user or subscriber, nor does it
necessarily represent the optimum performance achievable.
The present document is part of the GSM-series of technical specifications. The present document neither replaces any
of the other GSM technical specifications or GSM related ETSs or ENs, nor is it created to provide full understanding
of (or parts of) the GSM 900 system. The present document lists the additional test procedures, and provides the
methods of test for testing a professional MS for conformance to the GSM standard.
For a full description of the system, reference should be made to all the GSM technical specifications or GSM related
ETSs or ENs. Clause 2 provides a complete list of the GSM technical specifications, GSM related ETSs, ENs, and
ETRs, on which this conformance test specifications is based.
The present document applies to the unit which includes the hardware to establish a connection across the radio
interface.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 100 607-1: "Digital cellular telecommunications system (Phase 2+); Mobile Station (MS)
conformance specification; Part 1: Conformance specification (3GPP 11.10-1 Release 1999)".
[2] ETSI TS 100 910: "Digital cellular telecommunications system (Phase 2+); Radio transmission
and reception (3GPP TS 05.05 Release 1999)".
[3] ETSI TS 102 933-1: "Railway Telecommunications; GSM-R improved receiver parameters; Part
1: Requirements for radio reception".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 101 748: "Digital cellular telecommunications system (Phase 2+) (GSM); Abbreviations
and acronyms (GSM 01.04)".
ETSI
6 ETSI TS 102 933-2 V1.2.1 (2011-12)
[i.2] ETSI EN 300 607-1 (V8.1.1): "Digital cellular telecommunications system (Phase 2+) (GSM);
Mobile Station (MS) conformance specification; Part 1: Conformance specification (GSM 11.10-1
version 8.1.1 Release 1999)".
3 Abbreviations
For the purposes of the present document, the abbreviations given in TR 101 748 [i.1] apply.
4 Receiver
In this clause receiver measurements are described, for professional mobile stations equipped with a permant antenna
connector only. Wherever in this clause, for FACCH tests, the SS is required to send a Layer 3 message not requiring a
Layer 3 response from the professional MS the message can be a TEST INTERFACE message or a STATUS message,
possibly with an unknown Protocol Discriminator.
Testing philosophy
Certain assumptions concerning the functional mechanisms of GSM receivers have been made in order to define tests
that will verify the receiver performance without excessive redundancy and excessive test times.
The receiver functions can be divided into:
• Analogue RF and IF stages that are affected by input levels, temperature and power supply levels.
• Demodulator that is affected by input levels and interfering signals.
• Decoders that are affected by the different logical channels and input levels.
The tests are designed to stress each of these blocks with a minimum of redundancy.
4.1 Reference sensitivity
The reference sensitivity is the signal level at the professional MS receiver input at which a certain BER and FER must
be achieved.
The requirements and this test apply to professional MS supporting speech.
For tests using ARFCN ranges the following table shall be used.
Table 1: ARFCN Ranges
Term
Band Low ARFCN range Mid ARFCN range High ARFCN range
E-GSM 900 975 to 980 60 to 65 120 to 124
R-GSM 900 955 to 960 (R-GSM) and 60 to 65 120 to 124
975 to 980 (E-GSM)
ER-GSM 900 940 to 945 (ER-GSM) 60 to 65 120 to 124
975 to 980 (E-GSM)
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7 ETSI TS 102 933-2 V1.2.1 (2011-12)
4.2 Intermodulation rejection
4.2.1 Intermodulation rejection - speech channels
4.2.1.1 Definition and applicability
The intermodulation 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 two or more unwanted signals with a specific frequency
relationship to the wanted signal frequency.
The requirements and this test apply to professional MS supporting speech.
4.2.1.2 Conformance requirement
As specified by EN 300 607-1 [i.2]: "In the presence of two unwanted signals with a specific frequency relationship to
the wanted signal frequency the Class II RBER for TCH/FS shall meet the reference sensitivity performance of table 1
in GSM 05.05; GSM 05.05, 5.2".
4.2.1.3 Test purpose
To verify that the professional MS does not exceed the conformance requirement with an allowance for the statistical
significance of the test.
4.2.1.4 Method of test
NOTE: The measurements address the third order intermodulation, which represents the most serious case.
4.2.1.4.1 Initial conditions
A call is set up according to the generic call set up procedure on a TCH with an ARFCN in the mid range (see table 1),
power control level set to maximum power.
The SS transmits Standard Test Signal C1 on the traffic channel.
4.2.1.4.2 Procedure
a) The amplitude of the wanted signal is set to -100 dBm.
b) The SS commands the professional MS to create the loop back facility signalling erased frames.
c) The SS produces a static wanted signal, and two static interfering (unwanted) signals at the same time. There is
no correlation in the modulation between the signals.
- The first interfering signal is on a frequency equal to the centre frequency of an ARFCN four above that
of the receiver. This signal is static and unmodulated.
- The second interfering signal is on an ARFCN eight above that of the receiver. This signal is static,
continuous and modulated by random data.
- The amplitude of both the interfering signals is set according to table 2.
d) The SS compares the data of the signal that it sends to the professional MS with the signal which is looped
back from the receiver after demodulation and decoding, and checks the frame erasure indication.
- 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.
e) The measurement of step d) is repeated with the two unwanted signals having frequencies corresponding to
ARFCN four and eight below the ARFCN of the wanted signal.
ETSI
8 ETSI TS 102 933-2 V1.2.1 (2011-12)
f) Steps b) to e), are repeated but with the receiver operating on an ARFCN in the low range (see table 1) for
ER-GSM 900.
g) Steps b) to e), are repeated but with the receiver operating on an ARFCN in the high range (see table 1).
h) Steps a) to g) are repeated under extreme test conditions.
Table 2: Intermodulation test signal levels
Professional MS
R-GSM 900 and ER-GSM 900
dBm
WANTED SIGNAL -100
FIRST INTERFERER -36
SECOND INTERFERER -50
NOTE: Some of the levels in table 2 are different to those specified in TS 102 933-1 [3] due to the consideration
of the effect of modulation sideband noise from the second interferer.
4.2.1.5 Test requirements
The error rate measured in this test shall not exceed the test limit error rate values given in table 3.
This shall apply under normal condition and under any combination of normal and extreme test voltages and ambient
temperature, and with the two interfering signals at either side of the wanted frequency.
Table 3: Limits for intermodulation rejection
Channel Propagation Type of Test limit error Minimum No. of
conditions measurement rate % samples
TCH/FS Class II Static RBER 2,439 8 200

4.2.2 Intermodulation rejection - control channels
4.2.2.1 Definition and applicability
The intermodulation 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 two or m
...