SIST ETS 300 395-4 E2:2003
(Main)Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing
- Abstract
Selection and specification of the speech codec for TETRA voice plus data standard
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
- Mandate
- T-300
SIST ETS 300 395-4 E2:2003 is the Slovenian adoption of ETS 300 395-4 Edition 2 from ETSI. It covers Terrestrial Trunked Radio (TETRA) speech codec conformance testing for the full-rate traffic channel used in TETRA Voice plus Data (V+D) equipment. In practice, it tells manufacturers and test laboratories how to verify the TCH/S channel codec and speech codec, with bit-exact checks for the speech path and defined receiver performance limits for the channel path.
What does SIST ETS 300 395-4 E2:2003 specify?
SIST ETS 300 395-4 E2:2003 specifies the conformance bounds and test methods for the TETRA Speech Traffic Channel (TCH/S) codec in TETRA V+D equipment. It covers both the channel codec and the speech codec, and it organizes the work into general rules, radio test configuration, channel codec testing, speech codec testing, and supporting annexes.
The scope is narrow and practical: only the standard un-encrypted TCH/S is tested, and only the TETRA V+D parts of the referenced radio conformance specification apply. Unspecified or informative speech features are excluded from the tests, so the document is aimed at checking the standardized codec behavior rather than optional features.
| Annex | What it covers |
|---|---|
| Annex A | Normative TCH/S test cases and conditions for BS and MS receivers |
| Annex B | Normative codec conformance test vector sequences |
| Annex C | Informative codec reference test vector sequences |
| Annex D | Informative bibliography |
What are the key requirements of SIST ETS 300 395-4 E2:2003?
SIST ETS 300 395-4 E2:2003 requires the TCH/S tests to follow the general conformance-testing approach of ETS 300 394-1, but only where the TETRA V+D parts apply. That matters because the test setup, presentation of equipment, channel selection, and interpretation of results all follow a known conformance framework instead of being defined from scratch here.
The document separates the channel codec from the speech codec, and it treats them differently. The TCH/S channel encoder is bit exact, while the TCH/S channel decoder is assessed with non-bit-exact performance limits so that the receiver must meet the intended quality level rather than match a single output word for word.
Channel codec testing
Clause 6 says the TCH/S receiver tests use defined sensitivity and error-performance limits, with case details in Annex A. Annex A gives the test conditions for BS and MS receivers, including static and dynamic sensitivity cases, propagation conditions, receiver classes, and limits for BER, MER and PUEM.
This is important in practice because it turns receiver acceptance into measurable categories. A manufacturer or test lab has to show that the terminal meets the right sensitivity and error limits for the right receiver class and propagation condition, not just that it works in one favorable setup.
Speech codec testing
Clause 7 makes the speech codec test bit exact. The test compares a predefined input sequence with a stored reference output sequence, and the result must match bit by bit.
The document offers two test options, and the manufacturer together with the test laboratory chooses the one that best fits the equipment:
- Option 1 - Internal link method: tests the encoder and decoder together through an internal path, and suits equipment that can operate in full duplex or fast half duplex.
- Option 2 - Baseband method: tests decoding first and then encoding separately through a PCM path, and suits equipment that works in simplex mode.
This matters because the test setup has to match the way the equipment actually operates. A terminal that cannot switch quickly between receive and transmit may need the baseband method, while a duplex-capable design can be checked as a full transcoding chain.
Test conditions and exclusions
The test setup disables encryption and frame stealing during the conformance tests. The document also excludes the Voice Activity Detector (VAD) and other non-tested or future-standardized sub-systems from the scope of these tests.
That means the lab must present the codec in a standardized, unencrypted state. If the terminal has optional security or speech-processing features, those features are not part of the conformance verdict here.
Test vectors and reference data
Annex B provides the conformance test vector sequences, and Clause 7 refers to predefined files such as homing and input/output sequences. Annex C provides reference test vector sequences for implementation support.
In practice, this gives both sides of the process the same data files to run and compare. The result is repeatable testing: the test lab can feed the same sequences to different terminals and compare outputs on the same basis.
What terms does SIST ETS 300 395-4 E2:2003 define?
- TCH/S - Full Rate Speech Traffic Channel; the traffic channel used here for speech codec testing in TETRA V+D.
- V+D - Voice plus Data; the TETRA equipment profile to which the conformance testing applies.
- BS - Base Station; the network-side equipment for which receiver tests and limits are given.
- MS - Mobile Station; the terminal-side equipment for which receiver tests and limits are given.
- TSS - TETRA System Simulator; the test system used to exchange sequences and measure codec behavior.
- ACELP - Algebraic Code Excited Linear Predictive; the speech coding method named in the document.
- PUEM - Probability of Undetected Erroneous Message; a receiver performance measure used for TCH/S class 2 bits.
- PCM - Pulse Coded Modulation; the linear speech sample format used in the speech codec test paths.
Who uses SIST ETS 300 395-4 E2:2003?
SIST ETS 300 395-4 E2:2003 is used by TETRA equipment manufacturers, conformance test laboratories, and engineering teams responsible for radio and speech-codec verification. It is especially relevant to teams working on TE, BS and MS products that include the TCH/S channel.
In practice, users apply it when they need to:
- set up receiver sensitivity and error-rate tests for TCH/S
- run bit-exact speech codec conformance checks
- choose between internal-link and baseband test arrangements
- prepare evidence for product qualification or type testing
- compare codec outputs against predefined reference files
What changed in SIST ETS 300 395-4 E2:2003 from the previous edition?
SIST ETS 300 395-4 E2:2003 is the Second Edition of ETS 300 395-4. The document history shows that it follows the First Edition of May 1997.
Which standards are used with SIST ETS 300 395-4 E2:2003?
- ETS 300 392-2 - provides the TETRA V+D air interface and the definitions that this document uses for definitions and channel context.
- ETS 300 394-1 - provides the radio conformance-testing framework, including test presentation, equipment requirements, channel selection, measurement interpretation, and sensitivity and PUEM procedures.
- ETS 300 395-2 - defines the TETRA speech codec itself, including the bit-exact channel and speech codec behavior that this document tests.
- ETS 300 395-3 - covers specific operating features of the speech codec; this document refers to it, but excludes those non-standardized or informative features from the conformance tests.
- ETS 300 607-1 - gives an informative Digital Audio Interface (DAI) implementation that helps with the PCM test port setup.
What does the SIST ETS 300 395-4 E2:2003 document contain?
SIST ETS 300 395-4 E2:2003 contains the scope, references, definitions and abbreviations, then the general test rules, radio test configuration, channel codec testing, and speech codec testing. It also includes figures that show the test points and timing for the two speech-codec options.
The annexes add the practical test material: Annex A gives the receiver test tables, Annex B gives the conformance vector files and their formats, and Annex C gives reference vector files to help implementation and debugging. The document is therefore both a conformance specification and a test-data package for codec verification.
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Frequently Asked Questions
SIST ETS 300 395-4 E2:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing". This standard covers: Selection and specification of the speech codec for TETRA voice plus data standard
Selection and specification of the speech codec for TETRA voice plus data standard
SIST ETS 300 395-4 E2:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.10 - Terrestrial Trunked Radio (TETRA). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 395-4 E2:2003 is associated with the following European legislation: Standardization Mandates: T-300. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST ETS 300 395-4 E2:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
Prizemni snopovni radio (TETRA) – Govorni kodek za prometni kanal s polno
hitrostjo – 4. del: Preskušanje skladnosti kodeka
Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4:
Codec conformance testing
Ta slovenski standard je istoveten z: ETS 300 395-4 Edition 2
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 395-4
TELECOMMUNICATION September 2000
STANDARD Second Edition
Source: TETRA Reference: RE/TETRA-02042-5
ICS: 33.020
Key words: TETRA, CODEC
Terrestrial Trunked Radio (TETRA);
Speech codec for full-rate traffic channel;
Part 4: Codec conformance testing
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.org
Tel.:+334 92944200- Fax:+334 93 654716
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2000. All rights reserved.
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ETS 300 395-4: September 2000
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.
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ETS 300 395-4: September 2000
Contents
Foreword.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 General.8
5 Radio test configuration, test signals and test modes.8
6 TCH/S Channel Codec.9
6.1 Objectives .9
6.2 Conformance test methodology.9
6.3 Test decoding mode .9
6.3.1 General.10
6.3.2 TCH/S reference sensitivity performance .10
6.3.3 Methods of measurement for TCH/S testing.11
7 TCH/S speech codec .12
7.1 Objectives .12
7.2 Conformance test methodology.12
7.3 Option 1: Internal link method.13
7.3.1 Definition and applicability.13
7.3.2 Conformance requirement and purpose .13
7.3.3 Method of test.14
7.3.3.1 Initial conditions .14
7.3.3.2 Procedure .14
7.3.3.3 Internal link method requirements .14
7.3.3.4 Test requirements.16
7.4 Option 2: Baseband method .16
7.4.1 Definition and applicability.16
7.4.2 Conformance requirement and purpose .16
7.4.3 Method of test.16
7.4.3.1 Initial conditions .16
7.4.3.2 Procedure .16
7.4.3.3 Test requirements.17
Annex A (normative): TCH/S test cases and conditions for BS and MS receivers.18
Annex B (normative): Codec conformance test vector sequences .20
Annex C (informative): Codec reference test vector sequences.21
Annex D (informative): Bibliography.22
History.23
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ETS 300 395-4: September 2000
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ETS 300 395-4: September 2000
Foreword
This European Telecommunication Standard (ETS) has been produced by the Terrestrial Trunked Radio
(TETRA) ETSI Project of the European Telecommunications Standards Institute (ETSI).
This ETS consists of four parts as follows:
Part 1: "General description of speech functions";
Part 2: "TETRA codec";
Part 3: "Specific operating features";
Part 4: "Codec conformance testing".
Transposition dates
Date of adoption of this ETS: 23 June 2000
Date of latest announcement of this ETS (doa):
30 November 2000
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 May 2001
Date of withdrawal of any conflicting National Standard (dow): 31 May 2001
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ETS 300 395-4: September 2000
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ETS 300 395-4: September 2000
1 Scope
The objective of this ETS is to define the conformance bounds for the TETRA speech and channel codec
as deployed in the TETRA Speech Traffic Channel (TCH/S) channel type used in the TETRA Voice plus
Data (V+D) equipment.
For the speech part of the TCH/S codec, the conformance testing (clause 7 of this ETS) consists of a
bit-exact test where the reference is pre-computed and fixed.
For the TCH/S channel encoding a bit exact conformance test is also defined (see subclause 6.4).
For the TCH/S channel decoding, a non-bit exact test is employed with the specifications designed such
that a sufficient quality of performance is met by the TETRA equipment (see subclause 6.3).
2 Normative references
This ETS incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to, or revisions of, any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETSI ETS 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data
(V+D); Part 2: Air Interface (AI)".
[2] ETSI ETS 300 394-1: "Terrestrial Trunked Radio (TETRA); Conformance
testing specification; Part 1: Radio".
[3] ETSI ETS 300 395-2 (1996): "Terrestrial Trunked Radio (TETRA); Speech
codec for full-rate traffic channel; Part 2: TETRA codec".
[4] ETSI ETS 300 395-3 (1997): "Terrestrial Trunked Radio (TETRA); Speech
codec for full-rate traffic channel; Part 3: Specific operating features".
[5] ETSI ETS 300 607-1: "Digital cellular telecommunications system (Phase 2);
Mobile Station (MS) conformance specification; Part 1: Conformance
specification (GSM 11.10-1)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the definitions given in the following ETSs apply:
- ETS 300 392-2 [1], clause 3;
- ETS 300 394-1 [2], clause 3.
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ETS 300 395-4: September 2000
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ACELP Algebraic Code Excited Linear Predictive
BER Bit Error Rate
BS Base Station
DAI Digital Audio Interface
dBm Decibels relative to one milliWatt
MER Message Erasure Rate
MS Mobile Station
PCM Pulse Coded Modulation
PDO Packet Data Optimized
PRBS Pseudo Random Bit Sequence
PUEM Probability of Undetected Erroneous Message
RF Radio Frequency
RX Receive
STCH STealing CHannel
TCH/S Full Rate Speech Traffic CHannel
TDM Time Division Multiplexing
TE Terminal Equipment
TSS TETRA System Simulator
TX Transmit
VAD Voice Activity Detector
See ETS 300 394-1 [2], clause 3, for conformance testing abbreviations.
4 General
The conformance testing of the TCH/S channel shall be conducted in identical or similar methodology as
specified in ETS 300 394-1 [2]. However, as ETS 300 394-1 [2] is specified for both the TETRA V+D and
TETRA Packet Data Optimized (PDO), only the TETRA V+D part of ETS 300 394-1 [2] shall be applicable
to this ETS. Therefore, all references to ETS 300 394-1 [2] clauses shall refer to the TETRA V+D sections
only. For the purpose of this ETS, the following where applicable shall apply:
- presentation of equipment for testing purposes shall be as specified in ETS 300 394-1 [2],
subclause 4.1;
- facilities and information required for testing shall be as specified in ETS 300 394-1 [2],
subclause 4.1.1;
- choice of radio frequency channels to be tested shall be as specified in ETS 300 394-1 [2],
subclause 4.1.2;
- interpretation of the measurement results shall be as specified in ETS 300 394-1 [2],
subclause 4.1.3;
- mechanical and electrical design shall be as specified in ETS 300 394-1 [2], subclause 4.2.
5 Radio test configuration, test signals and test modes
In order to perform the conformance testing specified in this ETS, the Terminal Equipment (TE) shall have
been tested to, and passed, the relevant specifications as given in ETS 300 394-1 [2]. Thus, all
appropriate logical channel types apart from the TCH/S shall have been tested.
In this ETS, the TETRA speech and channel codec as specified in ETS 300 395-2 [3], shall be
conformance tested under standard TETRA specified configurations. All unspecified or informative parts
of the TETRA speech and channel codec shall be disabled and not tested. For example, sub-systems
such as the Voice Activity Detector (VAD) as given in ETS 300 395-3 [4] shall be excluded from the tests
in this ETS. If these and other speech related sub-systems are standardized in future phases of TETRA
then a separate conformance test may be generated to test these new additions.
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ETS 300 395-4: September 2000
In this ETS, only the standard un-encrypted TCH/S shall be tested. Thus the TE's encryption capability, if
implemented by the TE, shall be disabled for the duration of the tests specified in this ETS. Similarly, all
parts related to the STealing CHannel (STCH) and the eventually associated half slot containing encoded
speech shall not be tested and shall not be activated in the test.
The test signal T1 shall be as specified in ETS 300 394-1 [2], subclause 5.3.2.
In accordance to ETS 300 394-1 [2], the channel type tested under this ETS shall be designated as
channel type 15 and 16 for TCH/S channel codec testing and 19 and 20 for TCH/S speech codec testing.
For Mobile Station (MS) testing, on frame 1 to 17, table 1 shall apply. For Base Station (BS) testing, on
frame 1 to 17, table 2 shall apply.
Table 1: Channel type for MS testing
Channel type Burst type Block 1 Block 2 Broadcast block
15 normal TCH/S Access Assignment
PRBS Channel (AACH)
19 normal TCH/S Access Assignment
speech codec test Channel (AACH)
Table 2: Channel type for BS testing
Channel type Burst type Sub slot 1 Sub slot 2
16 normal TCH/S
PRBS
20 normal TCH/S
speech codec test
6 TCH/S Channel Codec
6.1 Objectives
The objective of this clause is to specify and present performance limits for the TCH/S channel encoding
and decoding sub-system. The TCH/S channel encoder is specified in bit exact terms and is given in
ETS 300 395-2 [3], clause 5, and all TE shall operate according to it. The TCH/S channel decoder is
specified in non-bit exact terms and is given in ETS 300 395-2 [3], clause 6, while an informative example
implementation is given in ETS 300 395-2 [3], annex A. The performance of the TCH/S channel decoder
is specified in this clause.
6.2 Conformance test methodology
The presentation of the conformance testing procedures for the TCH/S shall be the same as for the other
logical channel types as specified in ETS 300 394-1 [2]. Therefore, as described in ETS 300 394-1 [2], all
conformance test data between the TETRA System Simulator (TSS) and the TE shall be via two ports,
namely the antenna port and the test connector.
The type tests described in this ETS shall be performed under normal test conditions as specified in
ETS 300 394-1 [2], subclauses 6.2 and 6.2.1.
6.3 Test decoding mode
For the TCH/S channel decoding test mode, the TE under test shall perform the test in a similar manner
as other channel coded channels as specified in ETS 300 394-1 [2], subclause 5.2.1.
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ETS 300 395-4: September 2000
6.3.1 General
The test set up, procedures and measurement methods detailed in ETS 300 394-1 [2] shall be used in
testing TETRA V+D equipment TCH/S performance.
The required minimum number of samples and test limit error rates used in the following TCH/S receiver
test are defined such that:
a) the probability of passing a bad unit is lower than 0,3 %;
b) the probability of passing a good unit, operating on the limit of performance, is at least 99,5 %.
The Bit Error Ratio/Message Erasure Rate (BER/MER) test limits adopted have been selected in order
not to pass a unit with a sensitivity performance 1 dB worse than that of an unit which just meets the
specification.
NOTE: The above definition does not apply to Probability of Undetected Erroneous Message
(PUEM) measurements.
6.3.2 TCH/S reference sensitivity performance
The minimum required reference sensitivity performance for V+D equipment is specified in annex A
according to test condition, propagation condition and receiver class.
The maximum dynamic and static reference sensitivity levels for a BS receiver under normal test
conditions shall not exceed the signal levels shown in table 3.
Table 3: BS receiver minimum reference sensitivity
Test condition Dynamic reference Static reference sensitivity
sensitivity
Normal - 106 dBm - 115 dBm
The maximum dynamic and static reference sensitivity levels for a MS receiver under normal test
conditions shall not exceed the signal levels shown in table 4.
Table 4: MS receiver minimum reference sensitivity
Test condition Dynamic reference Static reference sensitivity
sensitivity
Normal - 103 dBm - 112 dBm
The TCH/S cases to be tested and the corresponding limit values for BER and MER are given in annex A,
tables A.1 to A.5.
All MS equipment shall achieve a PUEM on TCH/S class 2 bits of < 0,01 % measured in static channel
conditions. The test cases, number of required samples and test limit values are given in annex A,
table A.6.
All TCH/S receiver tests shall be carried out under normal conditions only.
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ETS 300 395-4: September 2000
6.3.3 Methods of measurement for TCH/S testing
The test system, test conditions and test configuration used in TCH/S testing are detailed in
ETS 300 394-1 [2], clauses 4 and 5 with the following exceptions:
- unlike other protected logical channels, the TCH/S channel splits the data bits from the TETRA
speech codec into three classes of bits, the lowest priority designated class 0, medium priority
designated class 1, and highest priority designated class 2. The assignment of the bits of the
TETRA speech parameters to its sensitivity classification shall be as given in ETS 300 395-2 [3],
subclause 5.4.1, table 4;
- in the case of BS V+D receiver testing the test system shall transmit in T1 time-slot 1 on frames 1
to 17 an uplink channel type 16 burst (see table 5).
Table 5: TCH/S uplink channel type
Channel type Burst type Subslot 1 + Subslot 2
16 Normal TCH/S
- in the case of MS V+D receiver testing the test system shall transmit in T1 timeslot 1 on frames 1 to
17 a downlink channel type 15 burst (see table 6).
Table 6: TCH/S downlink channel type
Channel type Burst type Block 1 + Block 2
15 Normal TCH/S
The equipment shall be connected to the test system via its antenna connector.
The test procedures detailed in ETS 300 394-1 [2], subclauses 9.3.1, 9.3.2 and 9.3.3 for sensitivity
performance and PUEM performance shall be adopted for TCH/S testing.
The TSS shall incorporate some mechanism for preserving frame synchronization between the
transmitted and decoded data so that the error rates for each class of bits can be correctly determined.
In summary, the following procedure is adopted for channel decoding testing:
- establish test receive mode for the TE under test;
- transmit test sequence (7,2 kbit/s) from TSS to TE via the antenna port using the TCH/S type;
- the TE receives the test sequence and performs channel decoding;
- the TE transmits the decoded information bits in the correct type classification to the TSS via the
test port;
- the TSS receives and processes the TE data bits.
The above procedure shall be repeated for all the different conditions as set out in annex A.
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ETS 300 395-4: September 2000
7 TCH/S speech codec
7.1 Objectives
The objective of this clause is to specify the test methodology and the conformance requirements for the
TETRA speech coding and decoding sub-systems as given by ETS 300 395-2 [3], clause 4 of the TETRA
TCH/S channel type. The objective of the test is to present to both the TETRA speech encoder and
decoder a pre-defined sequence which when processed shall match exactly with a stored conformance
output sequence. The matching shall be performed on a bit-by-bit basis, thus the testing is a bit exact
conformance test.
7.2 Conformance test methodology
TETRA System Simulator
Signals 8 kHz with
TETRA ACELP 16 bits PCM per TETRA ACELP
sample
packets packets
Point A Point B Point C Point E Point D
Air Interface
Air Interface TETRA Test
with bit, slot Connector with bi
...