SIST EN 300 395-4 V1.3.1:2006

• Abstract:

  The objective of the present document 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 the present document) 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 clause 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 clause 6.3).

• Status: Published
• Publication Date: 31-Mar-2006
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2006
• Due Date: 01-Apr-2006
• Completion Date: 01-Apr-2006
• Ref Project: ETSI EN 300 395-4 V1.3.1 (2005-06) - Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing

SIST EN 300 395-4 V1.3.1:2006 is the Slovenian adoption of ETSI EN 300 395-4 V1.3.1, the European standard for Terrestrial Trunked Radio (TETRA) speech codec conformance testing on the full-rate traffic channel. It specifies how TETRA Voice plus Data (V+D) equipment is tested for speech and channel codec behavior on the TCH/S channel. The document is mainly for manufacturers, test laboratories, and acceptance teams that need a defined pass-fail method for codec conformance.

What does SIST EN 300 395-4 V1.3.1:2006 specify?

SIST EN 300 395-4 V1.3.1:2006 specifies conformance bounds and test methods for the TETRA Speech Traffic Channel (TCH/S) codec used in TETRA Voice plus Data (V+D) equipment. It covers both speech coding and channel coding, with bit-exact testing for the speech part and the channel encoder, and a non-bit-exact performance test for the channel decoder.

The scope is narrow and practical: only the standard un-encrypted TCH/S is tested, encryption is disabled during testing, and related functions such as STealing CHannel (STCH) and Voice Activity Detector (VAD) are excluded from the tests. The document also covers the AMR 4,75 kb/s speech and channel codec.

The standard is organized into clauses 1 to 7, followed by four annexes.

Annex	What it covers
Annex A	Normative TCH/S receiver test cases and conditions for Base Station (BS) and Mobile Station (MS) equipment
Annex B	Normative codec conformance test vector sequences
Annex C	Informative codec reference test vector sequences
Annex D	Bibliography

What are the key requirements of SIST EN 300 395-4 V1.3.1:2006?

SIST EN 300 395-4 V1.3.1:2006 requires TCH/S conformance testing to follow the same general radio test approach as EN 300 394-1, but only the TETRA V+D parts of that standard apply here. In practice, that means the same style of equipment presentation, test support, channel selection, result interpretation, and mechanical/electrical design assumptions are reused for TCH/S testing.

Channel codec testing

Clause 6 defines the TCH/S channel codec tests. The channel encoder is treated as bit exact, while the channel decoder is evaluated with non-bit-exact limits that are chosen to represent sufficient performance. For a reader, this means the decoder is judged by measurable error performance rather than by exact bit-for-bit matching.

Clause 6.3 sets the receiver test approach and links it to BER, MER and PUEM measurements. It also states the statistical intent behind the limits: the tests are set so a bad unit is unlikely to pass and a good unit near the limit is likely to pass. That matters because the standard is trying to separate acceptable and marginal equipment with practical confidence.

Receiver sensitivity and test cases

Clause 6.3.2 gives separate reference sensitivity expectations for BS and MS receivers, and Annex A provides the detailed test cases by equipment class and propagation condition. Annex A is where a test engineer finds the combinations to run for static and fading conditions, together with sample size and limit values.

The PUEM test is also defined for MS and BS equipment in Annex A. This is relevant where the concern is not only bit errors but also whether an erroneous message can slip through undetected.

Test setup and channel types

Clause 6.3.3 ties the tests to the TETRA System Simulator (TSS) and the TE test item, using the antenna port and test connector path defined in EN 300 394-1. For TCH/S testing, the standard assigns specific channel types for MS and BS test setups. In practice, this tells the lab which burst format and traffic-channel direction to use.

Speech codec testing

Clause 7 makes the speech codec test bit exact. The TE is driven with pre-defined sequences, and the output must match the stored reference sequence exactly, bit by bit. That is important for interoperability because there is no tolerance band in the speech codec conformance check.

Clause 7 offers two test options. Option 1, the Internal link method, tests the decoder and encoder together and suits equipment that can operate in full duplex or fast half duplex mode. Option 2, the Baseband method, tests decoder and encoder separately and suits simplex operation, but needs an extra PCM data port.

Both options use the same reference sequences and compare the final output against SEQ4_72.OUT. The practical meaning is that a manufacturer can choose the setup that fits the equipment architecture, but not the pass criterion.

Test conditions and exclusions

Clause 7 requires encryption and frame stealing to be deactivated for the speech codec tests. It also identifies the sequence files used to reset and exercise the codec chain. Annex B and Annex C support this with file formats and reference vectors for both TETRA ACELP and AMR testing.

What terms does SIST EN 300 395-4 V1.3.1:2006 define?

The standard uses the definitions from EN 300 392-2 and EN 300 394-1, and it also relies on a defined set of abbreviations.

• Base Station (BS) - The fixed station category whose receiver conformance is tested in Annex A.
• Mobile Station (MS) - The mobile terminal category whose receiver conformance is tested in Annex A.
• TCH/S full rate Speech Traffic CHannel - The TETRA traffic channel used for speech codec testing.
• TETRA System Simulator (TSS) - The test system that sends sequences to the TE and checks the returned results.
• TETRA Test Connector Interface (TTCI) - The connector interface used as one of the possible speech codec recovery points.
• Pulse Coded Modulation (PCM) - The linear audio stream format used in the speech codec test paths.
• Bit Error Rate (BER) - The error measure used in channel decoding tests.
• Message Erasure Rate (MER) - The message-level error measure used alongside BER.
• Probability of Undetected Erroneous Message (PUEM) - The measure used to check whether a wrong message can pass as correct.

Who uses SIST EN 300 395-4 V1.3.1:2006?

SIST EN 300 395-4 V1.3.1:2006 is used by TETRA equipment manufacturers, especially teams developing V+D terminals, base stations, and codec implementations. Test laboratories use it to set up conformance runs, choose the right test option, and compare measured outputs with the required sequences and limits.

Quality and acceptance teams use it to check receiver sensitivity, BER/MER performance, and PUEM behavior on BS and MS equipment. It is also relevant to procurement and certification workflows when a buyer needs evidence that a TCH/S implementation has been tested against the prescribed codec conformance method.

What changed in SIST EN 300 395-4 V1.3.1:2006 from the previous edition?

SIST EN 300 395-4 V1.3.1:2006 is the V1.3.1 publication of ETSI EN 300 395-4 and follows V1.3.0 in the publication history. The publication history lists the earlier editions and the 2005 approval/publication cycle.

Which standards are used with SIST EN 300 395-4 V1.3.1:2006?

SIST EN 300 395-4 V1.3.1:2006 is used together with these standards from its references and related parts:

• ETSI EN 300 394-1 - Provides the general TETRA conformance testing approach, radio test setup, and the V+D test framework used throughout this document.
• ETSI EN 300 395-2 - Defines the TETRA codec behavior that is being tested here, including the channel and speech coding functions.
• ETSI EN 300 395-3 - Covers specific operating features, including VAD, which this document excludes from testing.
• ETSI EN 300 392-2 - Supplies the TETRA terms and definitions used for this document.
• ETSI EN 300 607-1 - Gives an informative example of the PCM / Digital Audio Interface (DAI) port implementation.
• ETSI EN 301 704 - Appears in the bibliography as a related AMR speech transcoding standard.

What does the SIST EN 300 395-4 V1.3.1:2006 document contain?

The document contains a test-oriented structure rather than a product description. Clause 4 sets the general test approach, clause 5 defines radio test configuration, signals and modes, clause 6 covers the TCH/S channel codec, and clause 7 covers the TCH/S speech codec.

Figure 1 shows the codec test points and the alternative paths through the TE, including the internal link and baseband methods. Figures 2 and 3 explain timing and buffering for the speech codec tests.

Annex A contains the receiver test tables for BS and MS equipment, including the conditions for static and fading tests and the PUEM cases. Annex B provides the conformance vector file names, formats and sizes, and Annex C gives reference test files that help implement the TE and TSS.

SLOVENSKI STANDARD
01-april-2006
Prizemni snopovni radio (TETRA) – Govorni kodek za 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: EN 300 395-4 Version 1.3.1
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 Standard (Telecommunications series)

Terrestrial Trunked Radio (TETRA);
Speech codec for full-rate traffic channel;
Part 4: Codec conformance testing



2 ETSI EN 300 395-4 V1.3.1 (2005-06)

Reference
REN/TETRA-05115-4
Keywords
TETRA, codec
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ETSI
3 ETSI EN 300 395-4 V1.3.1 (2005-06)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions.5
3.2 Abbreviations.5
4 General.6
5 Radio test configuration, test signals and test modes .6
6 TCH/S channel codec.7
6.1 Objectives.7
6.2 Conformance test methodology.7
6.3 Test decoding mode.7
6.3.1 General.7
6.3.2 TCH/S reference sensitivity performance.8
6.3.3 Methods of measurement for TCH/S testing .8
7 TCH/S speech codec.9
7.1 Objectives.9
7.2 Conformance test methodology.9
7.3 Option 1: Internal link method .10
7.3.1 Definition and applicability .10
7.3.2 Conformance requirement and purpose .11
7.3.3 Method of test .11
7.3.3.1 Initial conditions.11
7.3.3.2 Procedure.11
7.3.3.3 Internal link method requirements .12
7.3.3.4 Test requirements.13
7.4 Option 2: Baseband method .13
7.4.1 Definition and applicability .13
7.4.2 Conformance requirement and purpose .13
7.4.3 Method of test .14
7.4.3.1 Initial conditions.14
7.4.3.2 Procedure.14
7.4.3.3 Test requirements.14
Annex A (normative): TCH/S test cases and conditions for BS and MS receivers .15
Annex B (normative): Codec conformance test vector sequences .17
Annex C (informative): Codec reference test vector sequences .18
Annex D (informative): Bibliography.19
History .20

ETSI
4 ETSI EN 300 395-4 V1.3.1 (2005-06)
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://webapp.etsi.org/IPR/home.asp).
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 European Standard (Telecommunications series) has been produced by ETSI Project Terrestrial Trunked Radio
(TETRA).
The present document is part 4 of a multi-part deliverable covering speech codec for full-rate traffic channel, as
identified below:
Part 1: "General description of speech functions";
Part 2: "TETRA codec";
Part 3: "Specific operating features";
Part 4: "Codec conformance testing".

National transposition dates
Date of adoption of this EN: 24 June 2005
Date of latest announcement of this EN (doa): 30 September 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2006
Date of withdrawal of any conflicting National Standard (dow): 31 March 2006

ETSI
5 ETSI EN 300 395-4 V1.3.1 (2005-06)
1 Scope
The objective of the present document 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 the present document) 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 clause 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 clause 6.3).
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ETSI EN 300 394-1: "Terrestrial Trunked Radio (TETRA); Conformance testing specification;
Part 1: Radio".
[2] ETSI EN 300 395-2: "Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic
channel; Part 2: TETRA codec".
[3] ETSI EN 300 395-3: "Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic
channel; Part 3: Specific operating features".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in EN 300 392-2 (see bibliography) and
EN 300 394-1 [1] apply.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in EN 300 394-1 [1] and the following apply:
AACH Access Assignment CHannel
ACELP Algebraic Code Excited Linear Predictive
AMR Adaptive Multi-Rate
BER Bit Error Rate
BS Base Station
DAI Digital Audio Interface
dBm deciBels relative to one milliWatt
ETSI
6 ETSI EN 300 395-4 V1.3.1 (2005-06)
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
TTCI TETRA Test Connector Interface
TX Transmit
VAD Voice Activity Detector
4 General
The conformance testing of the TCH/S channel shall be conducted in identical or similar methodology as specified in
EN 300 394-1 [1]. However, as EN 300 394-1 [1] is specified for both the TETRA V+D and TETRA Packet Data
Optimized (PDO), only the TETRA V+D part of EN 300 394-1 [1] shall be applicable to the present document.
Therefore, all references to EN 300 394-1 [1] clauses shall refer to the TETRA V+D sections only. For the purpose of
the present document, the following where applicable shall apply:
- presentation of equipment for testing purposes shall be as specified in EN 300 394-1 [1], clause 4.1;
- facilities and information required for testing shall be as specified in EN 300 394-1 [1], clause 4.1.1;
- choice of radio frequency channels to be tested shall be as specified in EN 300 394-1 [1], clause 4.1.2;
- interpretation of the measurement results shall be as specified in EN 300 394-1 [1], clause 4.1.3;
- mechanical and electrical design shall be as specified in EN 300 394-1 [1], clause 4.2.
5 Radio test configuration, test signals and test modes
In order to perform the conformance testing specified in the present document, the Terminal Equipment (TE) shall have
been tested to, and passed, the relevant specifications as given in EN 300 394-1 [1]. Thus, all appropriate logical
channel types apart from the TCH/S shall have been tested.
In the present document, the TETRA speech and channel codec as specified in EN 300 395-2 [2], 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 EN 300 395-3 [3] shall be excluded from the tests in the present document. 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. The present document also covers testing of the AMR 4,75 kb/s speech and channel codec.
In the present document, 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 the present document. 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 EN 300 394-1 [1], clause 5.3.2.
ETSI
7 ETSI EN 300 395-4 V1.3.1 (2005-06)
In accordance to EN 300 394-1 [1], the channel type tested under the present document 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 EN 300 395-2 [2], 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
EN 300 395-2 [2], clause 6, while an informative example implementation is given in EN 300 395-2 [2], 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 EN 300 394-1 [1]. Therefore, as described in EN 300 394-1 [1], 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 the present document shall be performed under normal test conditions as specified in
EN 300 394-1 [1], clauses 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 EN 300 394-1 [1], clause 5.2.1.
6.3.1 General
The test set up, procedures and measurement methods detailed in EN 300 394-1 [1] 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 %.
ETSI
8 ETSI EN 300 395-4 V1.3.1 (2005-06)
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 a 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 sensitivity Static reference 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 sensitivity Static reference 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 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 table A.6.
All TCH/S receiver tests shall be carried out under normal conditions only.
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 EN 300 394-1 [1], 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 EN 300 395-2 [2], clause 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
ETSI
9 ETSI EN 300 395-4 V1.3.1 (2005-06)
The equipment shall be connected to the test system via its antenna connector.
The test procedures detailed in EN 300 394-1 [1], clauses 9.3.1 to 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.
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 EN 300 395-2 [2], 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. Similar conformance
...