SIST ETS 300 395-4:1999

• Abstract:

  Selection and specification of the speech codec for TETRA voice plus data standard

• Status: Published
• Publication Date: 31-Oct-1999
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1999
• Due Date: 01-Nov-1999
• Completion Date: 01-Nov-1999
• Mandate: T-300
• Ref Project: ETSI ETS 300 395-4 ed.1 (1997-05) - Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing

SIST ETS 300 395-4:1999 is the SIST version of ETS 300 395-4, the ETSI standard for Terrestrial Trunked Radio (TETRA) speech codec conformance testing. It specifies how to test the speech and channel codec used in the TETRA Speech Traffic Channel (TCH/S) for Voice plus Data (V+D) equipment, so manufacturers and test labs can check encoder behavior, decoder performance, and receiver sensitivity against defined TETRA conditions.

What does SIST ETS 300 395-4:1999 specify?

SIST ETS 300 395-4:1999 specifies the conformance bounds and test methods for the TCH/S speech and channel codec. It focuses on the standard un-encrypted TCH/S used in TETRA V+D equipment, and it organizes the document into general clauses plus three annexes.

Annex	What it covers
Annex A	Normative TCH/S receiver 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

The body of the standard covers scope, references, definitions, general test handling, radio test configuration, TCH/S channel codec testing, and TCH/S speech codec testing. In practice, that means the document tells a test house what to connect, what to disable, what sequences to use, and what output must be accepted.

What are the key requirements of SIST ETS 300 395-4:1999?

• The test methods follow the general conformance-testing approach of ETS 300 394-1, but only the TETRA V+D parts apply here. This matters because the same lab framework is reused, but only for the voice plus data case.

• The tests apply to the TCH/S channel type, and the Terminal Equipment (TE) must already have passed the relevant radio conformance tests. In practice, the codec test is not a stand-alone radio approval; it sits on top of the radio testing base.

• Only the standard un-encrypted TCH/S is tested. Encryption, STealing CHannel (STCH) functions, and other unspecified or informative parts such as Voice Activity Detector (VAD) are excluded from the test setup. That keeps the test focused on the core codec path.

• The TCH/S channel codec is tested with different methods for encoding and decoding. The encoder is bit exact, while the decoder is checked by performance limits using Bit Error Ratio (BER), Message Erasure Rate (MER), and Probability of Undetected Erroneous Message (PUEM). This means the lab checks exact output where required and quality limits where exact matching is not used.

• Receiver testing uses the test cases and limits in Annex A. The annex gives separate conditions for Base Station (BS) and Mobile Station (MS) receivers, including dynamic and static reference sensitivity and the class 2 PUEM limit. In practice, the receiver must meet the annex limits under normal test conditions.

• The codec bit stream is split into class 0, class 1, and class 2 bits, with the sensitivity classification defined in ETS 300 395-2. This tells the tester which bits are most critical when judging errors.

• The speech codec test is bit exact and uses pre-computed sequences. Clause 7 defines two options: Option 1 tests encoder and decoder together over the air interface, while Option 2 tests them separately through a PCM path. The choice depends on whether the TE supports full duplex, fast half-duplex, or simplex operation.

• The speech codec pass criterion is simple: the output sequence must match the reference sequence bit by bit. That gives a clear pass/fail result for conformity testing.

What terms does SIST ETS 300 395-4:1999 define?

• TCH/S - Full Rate Speech Traffic Channel, the TETRA traffic channel used for speech in this standard.
• TE - Terminal Equipment, the device under test.
• TSS - TETRA System Simulator, the test system that exchanges framed traffic with the TE.
• ACELP - Algebraic Code Excited Linear Predictive coding, the speech coding method used in the codec.
• BER - Bit Error Ratio, used to measure bit errors in receiver testing.
• MER - Message Erasure Rate, used when the unit of measurement is a message or slot.
• PUEM - Probability of Undetected Erroneous Message, used for the class 2 receiver criterion.
• PCM - Pulse Coded Modulation, the 16-bit linear audio stream used at the PCM test port.

Who uses SIST ETS 300 395-4:1999?

SIST ETS 300 395-4:1999 is used by TETRA equipment manufacturers, conformance test laboratories, and radio system integrators. It is also used by quality managers and buyers who need to verify that a TETRA V+D product has been tested against the expected codec behavior.

What changed in SIST ETS 300 395-4:1999 from the previous edition?

SIST ETS 300 395-4:1999 corresponds to ETS 300 395-4 Edition 1.

Which standards are used with SIST ETS 300 395-4:1999?

This standard belongs to the four-part ETS 300 395 series: Part 1 gives the general description of speech functions, Part 2 defines the TETRA codec, Part 3 covers specific operating features, and Part 4 gives codec conformance testing.

The normative references add the context needed for testing:

• ETS 300 392-2 - provides the TETRA V+D air interface and the reference sensitivity framework.
• ETS 300 394-1 - provides the general radio conformance-testing methods used here.
• ETS 300 395-2 - defines the codec behavior and bit assignments tested in this part.
• ETS 300 395-3 - provides the specific operating features that are excluded from these tests, such as VAD.
• ETS 300 607 - gives an informative Digital Audio Interface reference for the PCM test port.
• CCITT Recommendation O.153 - provides basic error-performance measurement parameters.

What does the SIST ETS 300 395-4:1999 document contain?

The standard contains the test architecture for TCH/S conformance, including the TETRA System Simulator, antenna port, test connector, and PCM test port arrangements. Figure 1 shows the test points and the two speech codec test options, and Figure 2 shows the half-duplex timing arrangement.

Annex A contains receiver test tables for BS and MS equipment, with sensitivity, BER, MER, and PUEM conditions. Annex B gives the electronic conformance vectors used for pass/fail testing, and Annex C gives reference vectors that help manufacturers implement the codec and test setup.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radijska oprema in sistemi (RES) - Vseevropski sistem snopovnega radia (TETRA) - Prizemni snopovni radio (TETRA) - Govorni kodek za kanal s polno hitrostjo - 4. del: Preskušanje skladnosti kodekaTerrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)33.020Telekomunikacije na splošnoTelecommunications in generalICS:Ta slovenski standard je istoveten z:ETS 300 395-4 E13SIST ETS 300 395-4:1999en01-MXOLM19993SIST ETS 300 395-4:1999SLOVENSKI
STANDARD
EUROPEANETS 300 395-4TELECOMMUNICATIONMay 1997STANDARDSource: ETSI TC-RESReference: DE/RES-06002-5ICS:33.020Key words:TETRA, CODECRadio Equipment and Systems (RES);Trans-European Trunked Radio (TETRA);Speech codec for full-rate traffic channel;Part 4: Codec conformance testingETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 395-4:1999

Page 2ETS 300 395-4: May 1997Whilst 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 Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 395-4:1999

Page 3ETS 300 395-4: May 1997ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.73.1Definitions.73.2Abbreviations.74General.85Radio test configuration, test signals and test modes.86TCH/S Channel Codec.96.1Objectives.96.2Conformance test methodology.96.3Test decoding mode.96.3.1General.96.3.2TCH/S reference sensitivity performance.96.3.3Methods of measurement for TCH/S testing.107TCH/S speech codec.117.1Objectives.117.2Conformance test methodology.117.3Option 1: air interface configuration.127.3.1Definition and applicability.127.3.2Conformance requirement and purpose.127.3.3Method of test.137.3.3.1Initial conditions.137.3.3.2Procedure.137.3.3.3Air-interface requirements.137.3.3.4Test requirements.147.4Option 2: baseband configuration.147.4.1Definition and applicability.147.4.2Conformance requirement and purpose.147.4.3Method of test.157.4.3.1Initial conditions.157.4.3.2Procedure.157.4.3.3Test requirements.15Annex A (normative):TCH/S test cases and conditions for BS and MS receivers.16Annex B (normative):Codec conformance test vector sequences.18Annex C (informative):Codec reference test vector sequences.19History.20SIST ETS 300 395-4:1999

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Page 5ETS 300 395-4: May 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Radio Equipment andSystem (RES) Technical Committee 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 datesDate of adoption:2 May 1997Date of latest announcement of this ETS (doa):31 August 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):28 February 1998Date of withdrawal of any conflicting National Standard (dow):28 February 1998SIST ETS 300 395-4:1999

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Page 7ETS 300 395-4: May 19971ScopeThe objective of this European Telecommunication Standard (ETS) is to define the conformance boundsfor 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 abit-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 suchthat a sufficient quality of performance is met by the TETRA equipment (see subclause 6.3).2Normative referencesThis ETS incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to, or revisions of, any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ETS 300 392-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Voice plus Data; Part 2: Air Interface".[2]ETS 300 394-1 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Conformance testing specification; Part 1: Radio".[3]ETS 300 395-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full rate traffic channel; Part 2:TETRA codec".[4]ETS 300 395-3 (1995): "Radio Equipment and Services (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 3:Specific operating features".[5]ETS 300 607 (1994): "European Digital Cellular Telecommunications System(Phase 2); Mobile Station (MS) conformance specification (GSM 11.10)".[6]CCITT Recommendation O.153: "Basic parameters for the measurement oferror performance at bit rate below the primary rate".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS, the definitions given in the following ETSs apply:-ETS 300 392 part 2 [1], clause 3;-ETS 300 394 part 1 [2], clause 3.3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:ACELPAlgebraic Code Excited Linear PredictiveBERBit Error RatedBmDecibels relative to one milliWattMERMessage Erasure RatePUEMProbability of Undetected Erroneous MessagePCMPulse Coded ModulationSIST ETS 300 395-4:1999

Page 8ETS 300 395-4: May 1997TETerminal EquipmentTSSTETRA System SimulatorVADVoice Activity DetectorSTCHSTealing CHannelTCH/SFull Rate Speech Traffic CHannelSee ETS 300 394 part 1 [2], clause 3, for conformance testing abbreviations.4GeneralThe conformance testing of the TCH/S channel shall be conducted in identical or similar methodology asspecified in ETS 300 394-1 [2]. However, as ETS 300 394-1 [2] is specified for both the TETRA V+D andTETRA Packet Data Optimized (PDO), only the TETRA V+D part of ETS 300 394-1 [2] shall be applicableto this ETS. Therefore, all references to ETS 300 394-1 [2] clauses shall refer to the TETRA V+D sectionsonly. 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 4.2.5Radio test configuration, test signals and test modesIn order to perform the conformance testing specified in this ETS, the Terminal Equipment (TE) shall havebeen tested to, and passed, the relevant specifications as given in ETS 300 394-1 [2]. Thus, allappropriate 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 beconformance tested under standard TETRA specified configurations. All unspecified or informative partsof the TETRA speech and channel codec shall be disabled and not tested. For example, sub-systemssuch as the Voice Activity Detector (VAD) as given in ETS 300 395-3 [4] shall be excluded from the testsin this ETS. If these and other speech related sub-systems are standardized in future phases of TETRAthen a separate conformance test may be generated to test these new additions.In this ETS, only the standard un-encrypted TCH/S shall be tested. Thus the TE's encryption capability, ifimplemented by the TE, shall be disabled for the duration of the tests specified in this ETS. Similarly, allparts related to the STealing CHannel (STCH) and the eventually associated half slot containing encodedspeech 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 aschannel type 15 and 16 for TCH/S. 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 testingChannel typeBurst typeBlock 1Block 2Broadcast block15normalTCH/SAccess AssignmentChannel (AACH)SIST ETS 300 395-4:1999

Page 9ETS 300 395-4: May 1997Table 2: Channel type for BS testingChannel typeBurst typeSub slot 1Sub slot 216normalTCH/S6TCH/S Channel Codec6.1ObjectivesThe objective of this clause is to specify and present performance limits for the TCH/S channel encodingand decoding sub-system. The TCH/S channel encoder is specified in bit exact terms and is given inETS 300 395-2 [3], clause 5, and all TE shall operate according to it. The TCH/S channel decoder isspecified in non-bit exact terms and is given in ETS 300 395-2 [3], clause 6, while an informative exampleimplementation is given in ETS 300 395-2 [3], annex A. The performance of the TCH/S channel decoderis specified in this clause.6.2Conformance test methodologyThe presentation of the conformance testing procedures for the TCH/S shall be the same as for the otherlogical channel types as specified in ETS 300 394-1 [2]. Therefore, as described in ETS 300 394-1 [2], allconformance 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 inETS 300 394-1 [2], subclauses 6.2 and 6.2.1.6.3Test decoding modeFor the TCH/S channel decoding test mode, the TE under test shall perform the test in a similar manneras other channel coded channels as specified in ETS 300 394-1 [2], subclause 5.2.1.6.3.1GeneralThe test set up, procedures and measurement methods detailed in ETS 300 394-1 [2] shall be used intesting TETRA V+D equipment TCH/S performance.The required minimum number of samples and test limit error rates used in the following TCH/S receivertest 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 notto pass a unit with a sensitivity performance 1 dB worse than that of an unit which just meets thespecification.NOTE:The above definition does not apply to Probability of Undetected Erroneous Message(PUEM) measurements.6.3.2TCH/S reference sensitivity performanceThe minimum required reference sensitivity performance for V+D equipment is specified inETS 300 392-2 [1] according to test condition, propagation condition and receiver class.The maximum dynamic and static reference sensitivity levels for a BS receiver under normal testconditions shall not exceed the signal levels shown in table 3.SIST ETS 300 395-4:1999

Page 10ETS 300 395-4: May 1997Table 3: BS receiver minimum reference sensitivityTest conditionDynamic reference sensitivityStatic reference sensitivityNormal-106 dBm-115 dBmThe maximum dynamic and static reference sensitivity levels for a MS receiver under normal testconditions shall not exceed the signal levels shown in table 4.Table 4: MS receiver minimum reference sensitivityTest conditionDynamic reference sensitivityStatic reference sensitivityNormal-103 dBm-112 dBmThe 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 channelconditions. 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.6.3.3Methods of measurement for TCH/S testingThe test system, test conditions and test configuration used in TCH/S testing are detailed inETS 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 TETRAspeech codec into three classes of bits, the lowest priority designated class 0, medium prioritydesignated class 1, and highest priority designated class 2. The assignment of the bits of theTETRA 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 1to 17 an uplink channel type 16 burst (see table 5).Table 5: TCH/S uplink channel typeChannel typeBurst typeSubslot 1 + Subslot 216NormalTCH/S-in the case of MS V+D receiver testing the test system shall transmit in T1 timeslot 1 on frames 1 to17 a downlink channel type 15 burst (see table 6).Table 6: TCH/S downlink channel typeChannel typeBurst typeBlock 1 + Block 215NormalTCH/SThe 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 sensitivityperformance and PUEM performance shall be adopted for TCH/S testing.The TSS shall incorporate some mechanism for preserving frame synchronization between thetransmitted and decoded data so that the error rates for each class of bits can be correctly determined.SIST ETS 300 395-4:1999

Page 11ETS 300 395-4: May 1997In 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 thetest port;-the TSS receives and processes the TE data bits.The above p
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radijska oprema in sistemi (RES) - Vseevropski sistem snopovnega radia (TETRA) - Prizemni snopovni radio (TETRA) - Govorni kodek za kanal s polno hitrostjo - 4. del: Preskušanje skladnosti kodekaTerrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4: Codec conformance testing33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:ETS 300 395-4 Edition 1SIST ETS 300 395-4:1999en01-november-1999SIST ETS 300 395-4:1999SLOVENSKI
STANDARD
EUROPEANETS 300 395-4TELECOMMUNICATIONMay 1997STANDARDSource: ETSI TC-RESReference: DE/RES-06002-5ICS:33.020Key words:TETRA, CODECRadio Equipment and Systems (RES);Trans-European Trunked Radio (TETRA);Speech codec for full-rate traffic channel;Part 4: Codec conformance testingETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 395-4:1999

Page 2ETS 300 395-4: May 1997Whilst 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 Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 395-4:1999

Page 3ETS 300 395-4: May 1997ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.73.1Definitions.73.2Abbreviations.74General.85Radio test configuration, test signals and test modes.86TCH/S Channel Codec.96.1Objectives.96.2Conformance test methodology.96.3Test decoding mode.96.3.1General.96.3.2TCH/S reference sensitivity performance.96.3.3Methods of measurement for TCH/S testing.107TCH/S speech codec.117.1Objectives.117.2Conformance test methodology.117.3Option 1: air interface configuration.127.3.1Definition and applicability.127.3.2Conformance requirement and purpose.127.3.3Method of test.137.3.3.1Initial conditions.137.3.3.2Procedure.137.3.3.3Air-interface requirements.137.3.3.4Test requirements.147.4Option 2: baseband configuration.147.4.1Definition and applicability.147.4.2Conformance requirement and purpose.147.4.3Method of test.157.4.3.1Initial conditions.157.4.3.2Procedure.157.4.3.3Test requirements.15Annex A (normative):TCH/S test cases and conditions for BS and MS receivers.16Annex B (normative):Codec conformance test vector sequences.18Annex C (informative):Codec reference test vector sequences.19History.20SIST ETS 300 395-4:1999

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Page 5ETS 300 395-4: May 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Radio Equipment andSystem (RES) Technical Committee 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 datesDate of adoption:2 May 1997Date of latest announcement of this ETS (doa):31 August 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):28 February 1998Date of withdrawal of any conflicting National Standard (dow):28 February 1998SIST ETS 300 395-4:1999

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Page 7ETS 300 395-4: May 19971ScopeThe objective of this European Telecommunication Standard (ETS) is to define the conformance boundsfor 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 abit-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 suchthat a sufficient quality of performance is met by the TETRA equipment (see subclause 6.3).2Normative referencesThis ETS incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to, or revisions of, any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ETS 300 392-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Voice plus Data; Part 2: Air Interface".[2]ETS 300 394-1 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Conformance testing specification; Part 1: Radio".[3]ETS 300 395-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full rate traffic channel; Part 2:TETRA codec".[4]ETS 300 395-3 (1995): "Radio Equipment and Services (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 3:Specific operating features".[5]ETS 300 607 (1994): "European Digital Cellular Telecommunications System(Phase 2); Mobile Station (MS) conformance specification (GSM 11.10)".[6]CCITT Recommendation O.153: "Basic parameters for the measurement oferror performance at bit rate below the primary rate".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS, the definitions given in the following ETSs apply:-ETS 300 392 part 2 [1], clause 3;-ETS 300 394 part 1 [2], clause 3.3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:ACELPAlgebraic Code Excited Linear PredictiveBERBit Error RatedBmDecibels relative to one milliWattMERMessage Erasure RatePUEMProbability of Undetected Erroneous MessagePCMPulse Coded ModulationSIST ETS 300 395-4:1999

Page 8ETS 300 395-4: May 1997TETerminal EquipmentTSSTETRA System SimulatorVADVoice Activity DetectorSTCHSTealing CHannelTCH/SFull Rate Speech Traffic CHannelSee ETS 300 394 part 1 [2], clause 3, for conformance testing abbreviations.4GeneralThe conformance testing of the TCH/S channel shall be conducted in identical or similar methodology asspecified in ETS 300 394-1 [2]. However, as ETS 300 394-1 [2] is specified for both the TETRA V+D andTETRA Packet Data Optimized (PDO), only the TETRA V+D part of ETS 300 394-1 [2] shall be applicableto this ETS. Therefore, all references to ETS 300 394-1 [2] clauses shall refer to the TETRA V+D sectionsonly. 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 4.2.5Radio test configuration, test signals and test modesIn order to perform the conformance testing specified in this ETS, the Terminal Equipment (TE) shall havebeen tested to, and passed, the relevant specifications as given in ETS 300 394-1 [2]. Thus, allappropriate 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 beconformance tested under standard TETRA specified configurations. All unspecified or informative partsof the TETRA speech and channel codec shall be disabled and not tested. For example, sub-systemssuch as the Voice Activity Detector (VAD) as given in ETS 300 395-3 [4] shall be excluded from the testsin this ETS. If these and other speech related sub-systems are standardized in future phases of TETRAthen a separate conformance test may be generated to test these new additions.In this ETS, only the standard un-encrypted TCH/S shall be tested. Thus the TE's encryption capability, ifimplemented by the TE, shall be disabled for the duration of the tests specified in this ETS. Similarly, allparts related to the STealing CHannel (STCH) and the eventually associated half slot containing encodedspeech 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 aschannel type 15 and 16 for TCH/S. 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 testingChannel typeBurst typeBlock 1Block 2Broadcast block15normalTCH/SAccess AssignmentChannel (AACH)SIST ETS 300 395-4:1999

Page 9ETS 300 395-4: May 1997Table 2: Channel type for BS testingChannel typeBurst typeSub slot 1Sub slot 216normalTCH/S6TCH/S Channel Codec6.1ObjectivesThe objective of this clause is to specify and present performance limits for the TCH/S channel encodingand decoding sub-system. The TCH/S channel encoder is specified in bit exact terms and is given inETS 300 395-2 [3], clause 5, and all TE shall operate according to it. The TCH/S channel decoder isspecified in non-bit exact terms and is given in ETS 300 395-2 [3], clause 6, while an informative exampleimplementation is given in ETS 300 395-2 [3], annex A. The performance of the TCH/S channel decoderis specified in this clause.6.2Conformance test methodologyThe presentation of the conformance testing procedures for the TCH/S shall be the same as for the otherlogical channel types as specified in ETS 300 394-1 [2]. Therefore, as described in ETS 300 394-1 [2], allconformance 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 inETS 300 394-1 [2], subclauses 6.2 and 6.2.1.6.3Test decoding modeFor the TCH/S channel decoding test mode, the TE under test shall perform the test in a similar manneras other channel coded channels as specified in ETS 300 394-1 [2], subclause 5.2.1.6.3.1GeneralThe test set up, procedures and measurement methods detailed in ETS 300 394-1 [2] shall be used intesting TETRA V+D equipment TCH/S performance.The required minimum number of samples and test limit error rates used in the following TCH/S receivertest 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 notto pass a unit with a sensitivity performance 1 dB worse than that of an unit which just meets thespecification.NOTE:The above definition does not apply to Probability of Undetected Erroneous Message(PUEM) measurements.6.3.2TCH/S reference sensitivity performanceThe minimum required reference sensitivity performance for V+D equipment is specified inETS 300 392-2 [1] according to test condition, propagation condition and receiver class.The maximum dynamic and static reference sensitivity levels for a BS receiver under normal testconditions shall not exceed the signal levels shown in table 3.SIST ETS 300 395-4:1999

Page 10ETS 300 395-4: May 1997Table 3: BS receiver minimum reference sensitivityTest conditionDynamic reference sensitivityStatic reference sensitivityNormal-106 dBm-115 dBmThe maximum dynamic and static reference sensitivity levels for a MS receiver under normal testconditions shall not exceed the signal levels shown in table 4.Table 4: MS receiver minimum reference sensitivityTest conditionDynamic reference sensitivityStatic reference sensitivityNormal-103 dBm-112 dBmThe 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 channelconditions. 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.6.3.3Methods of measurement for TCH/S testingThe test system, test conditions and test configuration used in TCH/S testing are detailed inETS 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 TETRAspeech codec into three classes of bits, the lowest priority designated class 0, medium prioritydesignated class 1, and highest priority designated class 2. The assignment of the bits of theTETRA 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 1to 17 an uplink channel type 16 burst (see table 5).Table 5: TCH/S uplink channel typeChannel typeBurst typeSubslot 1 + Subslot 216NormalTCH/S-in the case of MS V+D receiver testing the test system shall transmit in T1 timeslot 1 on frames 1 to17 a downlink channel type 15 burst (see table 6).Table 6: TCH/S downlink channel typeChannel typeBurst typeBlock 1 + Block 215NormalTCH/SThe 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 sensitivityperformance and PUEM performance shall be adopted for TCH/S testing.The TSS shall incorporate some mechanism for preserving frame synchronization between thetransmitted and decoded data so that the error rates for each class of bits can be correctly determined.SIST ETS 300 395-4:1999

Page 11ETS 300 395-4: May 1997In 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 thetest port;-the TSS receives and processes the TE data bits.The above procedure shall be repeated
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