ETSI ETS 300 395-4 ed.2 (2000-09)

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

RE/TETRA-02042-5

Prizemni snopovni radio (TETRA) – Govorni kodek za prometni kanal s polno hitrostjo – 4. del: Preskušanje skladnosti kodeka

General Information

• Status: Published
• Publication Date: 06-Sep-2000
• Technical Committee: TCCE 2 - Air Interface / Radio aspects
• Current Stage: 12 - Completion
• Due Date: 30-Jun-2000
• Completion Date: 07-Sep-2000
• Mandate: T-300
• Ref Project: SIST ETS 300 395-4 E2:2003 - Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 395-4 E2:2003
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)
SIST ETS 300 395-4 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ETS 300 395-4 E2:2003

---------------------- Page: 2 ----------------------

SIST ETS 300 395-4 E2:2003
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: [e-mail] - http://www.etsi.org
Tel.:[phone]- Fax:[phone]
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.

---------------------- Page: 3 ----------------------

SIST ETS 300 395-4 E2:2003
Page 2
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.

---------------------- Page: 4 ----------------------

SIST ETS 300 395-4 E2:2003
Page 3
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

---------------------- Page: 5 ----------------------

SIST ETS 300 395-4 E2:2003
Page 4
ETS 300 395-4: September 2000
Blank page

---------------------- Page: 6 ----------------------

SIST ETS 300 395-4 E2:2003
Page 5
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

---------------------- Page: 7 ----------------------

SIST ETS 300 395-4 E2:2003
Page 6
ETS 300 395-4: September 2000
Blank page

---------------------- Page: 8 ----------------------

SIST ETS 300 395-4 E2:2003
Page 7
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.

---------------------- Page: 9 ----------------------

SIST ETS 300 395-4 E2:2003
Page 8
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.

---------------------- Page: 10 ----------------------

SIST ETS 300 395-4 E2:2003
Page 9
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.

---------------------- Page: 11 ----------------------

SIST ETS 300 395-4 E2:2003
Page 10
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.

---------------------- Page: 12 ----------------------

SIST ETS 300 395-4 E2:2003
Page 11
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.

---------------------- Page: 13 ----------------------

SIST ETS 300 395-4 E2:2003
Page 12
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
...