Digital cellular telecommunications system (Phase 2) (GSM); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system (GSM 03.50)

....

Digitalni celični telekomunikacijski sistem (faza 2) – Vidiki načrtovanja prenosa govorne storitve prek GSM javnega kopenskega mobilnega omrežja (PLMN) (GSM 03.50)

General Information

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

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SLOVENSKI STANDARD
SIST ETS 300 540 E2:2003
01-december-2003

'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D ±9LGLNLQDþUWRYDQMDSUHQRVD

JRYRUQHVWRULWYHSUHN*60MDYQHJDNRSHQVNHJDPRELOQHJDRPUHåMD 3/01  *60


Digital cellular telecommunications system (Phase 2) (GSM); Transmission planning

aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system

(GSM 03.50)
Ta slovenski standard je istoveten z: ETS 300 540 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 540 E2:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 540 E2:2003
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SIST ETS 300 540 E2:2003
EUROPEAN ETS 300 540
TELECOMMUNICATION January 1996
STANDARD Second Edition
Source: ETSI TC-SMG Reference: RE/SMG-020350P
ICS: 33.060.50

Digital cellular telecommunications system, Global System Mobile communications (GSM)

Key words:
Digital cellular telecommunications system (Phase 2);
Transmission planning aspects of the speech service in the
GSM Public Land Mobile Network (PLMN) system
(GSM 03.50)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16

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 1996. All rights reserved.
New presentation - see History box
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ETS 300 540: January 1996 (GSM 03.50 Version 4.2.0)

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 Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 540: January 1996 (GSM 03.50 Version 4.2.0)
Contents

Foreword .......................................................................................................................................................7

1 General................................................................................................................................................9

1.1 Scope...................................................................................................................................9

1.2 Normative references ..........................................................................................................9

1.3 Definitions and abbreviations.............................................................................................11

1.4 Introduction ........................................................................................................................12

2 Network configurations......................................................................................................................12

2.1 General ..............................................................................................................................12

2.2 Model of the PLMN ............................................................................................................12

2.3 Interfaces ...........................................................................................................................12

2.4 Configurations of Connections...........................................................................................13

2.4.1 General Configurations of Connections ........................................................13

2.4.2 Reference configurations to illustrate delay and echo control issues............13

2.5 4-wire circuits in the PLMN ................................................................................................14

3 Transmission performance ...............................................................................................................14

3.1 Overall Loss/Loundness ratings ........................................................................................14

3.1.1 Connections with handset MSs .....................................................................15

3.1.2 Connections with handsfree MSs using loudspeakers..................................15

3.1.3 Connections with headset MSs .....................................................................16

3.2 Stability Loss......................................................................................................................16

3.3 Delay..................................................................................................................................16

3.3.1 General..........................................................................................................16

3.3.2 Sources of delay............................................................................................17

3.3.2.1 Elements of the PLMN that cause delay..............................17
3.3.2.2 Elements of the PSTN that cause delay..............................17

3.3.3 Effects of delay..............................................................................................17

3.3.4 Allocation of delay to the PLMN ....................................................................18

3.3.4.1 Allocation of delay to the PLMN when using a full rate

system .................................................................................18

3.3.4.2 Allocation of delay to the PLMN when using a half rate

system .................................................................................18

3.3.5 Delay of various network configurations........................................................18

3.3.5.1 National and international connections with no echo
control in the PSTN (reference configurations A)................18
3.3.5.2 National and international connections with echo control
in the PSTN (reference configurations B)............................18
3.3.5.3 Connections where re-routing leads to a significant
increase in transmission path length (reference

configurations C) .................................................................18

3.3.6 Delay related requirements on the MS..........................................................19

3.3.6.1 Full rate MS .........................................................................19

3.3.6.2 Half rate MS.........................................................................19

3.4 Echo...................................................................................................................................19

3.4.1 General..........................................................................................................19

3.4.2 Electrical echo control in the PLMN (Reference configurations A) ...............19

3.4.3 Acoustic echo control in the PLMN ...............................................................20

3.4.3.1 Acoustic echo control in a handsfree MS ............................20
3.4.3.2 Acoustic echo control in a handset MS ...............................20
3.4.3.3 Acoustic echo control in a headset MS ...............................20
3.4.4 Interaction between tandem echo control devices (reference

configurations B & C) ....................................................................................20

3.5 Clipping ..............................................................................................................................20

3.5.1 General..........................................................................................................20

3.5.2 Properties of voice switches in the PLMN.....................................................21

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3.5.3 Problems of tandem voice switching ............................................................ 21

3.6 Idle channel noise ............................................................................................................. 21

3.6.1 Sending......................................................................................................... 21

3.6.2 Receiving ...................................................................................................... 21

3.7 Noise contrast ................................................................................................................... 22

3.7.1 General ......................................................................................................... 22

3.7.2 Elements of a PLMN which can cause noise contrast impairment............... 22

3.7.3 Reduction of noise contrast .......................................................................... 22

3.7.3.1 Reduction of noise contrast by limiting the noise received

by the microphone............................................................... 22

3.7.3.1.1 Headset MS.......................................... 23
3.7.3.1.2 Handset MS.......................................... 23
3.7.3.1.3 Handsfree MS ...................................... 23
3.7.3.2 Reduction of noise contrast by insertion of comfort noise .. 23
3.7.4 Consequence of the introduction of high comfort noise levels on other

voice-operated devices................................................................................. 23

3.8 Sensitivity/frequency characteristics ................................................................................. 23

3.8.1 Headset and Handset MSs........................................................................... 23

3.8.1.1 Sending............................................................................... 23

3.8.1.2 Receiving ............................................................................ 24

3.8.2 Handsfree MS............................................................................................... 24

3.9 Distortion ........................................................................................................................... 24

3.9.1 Sending......................................................................................................... 24

3.9.2 Receiving ...................................................................................................... 25

3.10 Sidetone ............................................................................................................................ 26

3.10.1 Sidetone loss ................................................................................................ 26

3.10.2 Sidetone distortion ........................................................................................ 26

3.11 Out-of-band signals........................................................................................................... 26

3.11.1 Discrimination against out-of-band input signals .......................................... 26

3.11.2 Spurious out-of-band signals........................................................................ 27

3.12 Requirements for information tones.................................................................................. 27

3.13 Crosstalk ........................................................................................................................... 27

3.13.1 Near and far end crosstalk ........................................................................... 27

3.13.2 Go/return crosstalk ....................................................................................... 27

Annex A (informative): Considerations on the Acoustic Interface of the Mobile Station ........................ 37

A.1 Handsfree MS................................................................................................................................... 37

A.2 Handset MS...................................................................................................................................... 37

A.3 Headset MS...................................................................................................................................... 37

A.4 Inter-reaction with DTX..................................................................................................................... 37

Annex B (normative): Transmission requirements testing.................................................................... 38

B.1 Loudness ratings .............................................................................................................................. 38

B.1.1 Sending Loudness Rating (SLR)....................................................................................... 38

B.1.2 Receiving Loudness Rating (RLR).................................................................................... 38

B.2 Idle Channel Noise ........................................................................................................................... 38

B.2.1 Sending ............................................................................................................................. 38

B.2.2 Receiving........................................................................................................................... 38

B.3 Sensitivity/frequency Characteristics ................................................................................................ 38

B.3.1 Sending ............................................................................................................................. 38

B.3.2 Receiving........................................................................................................................... 39

B.4 Distortion........................................................................................................................................... 39

B.4.1 Sending ............................................................................................................................. 39

B.4.2 Receiving........................................................................................................................... 39

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B.5 Variation of gain with input level........................................................................................................39

B.5.1 Sending..............................................................................................................................39

B.5.2 Receiving ...........................................................................................................................40

B.6 Sidetone ............................................................................................................................................40

B.6.1 Talker sidetone (STMR).....................................................................................................40

B.6.2 Listener sidetone (LSTR)...................................................................................................40

B.7 Sidetone distortion.............................................................................................................................41

B.8 Out-of-band signals...........................................................................................................................41

B.8.1 Discrimination against out-of-band input signal .................................................................41

B.8.2 Spurious out-of-band signals .............................................................................................41

B.9 Acoustic echo loss.............................................................................................................................41

Annex C (normative): MS delay requirement definition .........................................................................42

C.1 Full rate MS delay requirement definition..........................................................................................42

C.2 Half rate MS delay requirement definition .........................................................................................42

History..........................................................................................................................................................44

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ETS 300 540: January 1996 (GSM 03.50 Version 4.2.0)
Foreword

This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group

(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).

This ETS describes the transmission planning aspects pertaining to the speech service within the digital

cellular telecommunications system (Phase 2). This ETS corresponds to GSM Technical Specification

(GSM-TS) GSM 03.50 version 4.2.0.

The specification from which this ETS has been derived was originally based on CEPT documentation,

hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE rules.

Reference is made within this ETS to GSM-TSs (NOTE).

NOTE: TC-SMG has produced documents which give the technical specifications for the

implementation of the European digital cellular telecommunications system.

Historically, these documents have been identified as GSM Technical Specifications

(GSM-TSs). These TSs may have subsequently become I-ETSs (Phase 1), or ETSs
(Phase 2), whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are,
for editorial reasons, still referred to in current GSM ETSs.
Transposition dates
Date of adoption of this ETS: 31 January 1996
Date of latest announcement of this ETS (doa): 30 April 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1996
Date of withdrawal of any conflicting National Standard (dow): 31 October 1996
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1 General
1.1 Scope

This European Telecommunication Standard (ETS) is concerned with the transmission planning aspects

pertaining to the speech service in the pan-European PLMN system. Due to technical and economic

factors, there cannot be full compliance with the general characteristics of international telephone

connections and circuits recommended by CCITT.

This ETS gives guidance as to the precautions, measures and minimum requirements needed for

successful interworking of the PLMN with the national and international PSTN. The Recommendation

identifies a number of routing and network configurations. The objective is to reach a quality as close as

possible to CCITT standards in order to safeguard the performance seen by PSTN customers.

1.2 Normative references

This ETS incorporates by dated and 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. Unless otherwise stated, all references to CCITT

Recommendations are from the Blue Book (1989).
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunication system
(Phase 2); Abbreviations and acronyms".
[2] GSM 03.04 (ETS 300 524): "European digital cellular telecommunication system
(Phase 2); Signalling requirements relating to routing of calls to mobile
subscribers".
[3] GSM 06.01 (ETS 300 580-1): "European digital cellular telecommunication
system (Phase 2); Full rate speech processing functions".
[4] GSM 06.10 (ETS 300 580-2): "European digital cellular telecommunication
system (Phase 2); Full rate speech transcoding".
[5] GSM 06.11 (ETS 300 580-3): "European digital cellular telecommunication
system (Phase 2); Substitution and muting of lost frames for full rate speech
channels".
[6] GSM 06.12 (ETS 300 580-4): "European digital cellular telecommunication
system (Phase 2); Comfort noise aspect for full rate speech traffic channels".
[7] GSM 06.31 (ETS 300 580-5): "European digital cellular telecommunication
system (Phase 2); Discontinuous Transmission (DTX) for full rate speech traffic
channel".
[8] GSM 06.32 (ETS 300 580-6): "European digital cellular telecommunication
system (Phase 2); Voice Activity Detection (VAD)".
[9] GSM 06.02 (ETS 300 581-1): "European digital cellular telecommunication
system (Phase 2); Half rate speech processing functions".
[10] GSM 06.20 (ETS 300 581-2): "European digital cellular telecommunication
system (Phase 2); Half rate speech transcoding".
[11] GSM 06.21 (ETS 300 581-3): "European digital cellular telecommunication
system (Phase 2); Substitution and muting of lost frames for half rate speech
traffic channels".
[12] GSM 06.22 (ETS 300 581-4): "European digital cellular telecommunication
system (Phase 2); Comfort noise aspects for half rate speech traffic channels".
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ETS 300 540: January 1996 (GSM 03.50 Version 4.2.0)
[13] GSM 06.41 (ETS 300 581-5): "European digital cellular telecommunication
system (Phase 2); Discontinuous Transmission (DTX) for half rate speech traffic
channels".
[14] GSM 06.42 (ETS 300 581-6): "European digital cellular telecommunication
system (Phase 2); Voice Activity Detection (VAD) for half rate speech traffic
channels".
[15] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice; Attachment requirements for handset terminals".
[16] CCITT Recommendation G.103: "Hypothetical reference connections".
[17] CCITT recommendation G.111: "Loudness ratings (LRs) in an international
connections".
[18] CCITT Recommendation G.113: "Transmission impairments".
[19] CCITT Recommendation G.114: "Mean one-way propagation time".
[20] CCITT Recommendation G.121: "Loudness ratings (LRs) of national systems".
[21] CCITT Recommendation G.122: "Influence of national systems on stability,
talker echo, and listener echo in international connections".
[22] CCITT Recommendation G.131: "Stability and echo".
[23] CCITT Recommendation G.165: "Echo cancellers".
[24] CCITT Recommendation G.223: "Assumptions for the calculation of noise on
hypothetical reference circuits for telephony".
[25] CCITT Recommendation G.703: "Physical/electrical characteristics of
hierarchical digital interfaces".
[26] CCITT Recommendation G.711: "Pulse code modulation (PCM) of voice
frequencies".
[27] CCITT Recommendations G.712: "Transmission performance characteristics of
pulse code modulation".
[28] CCITT Recommendations G.714: "Separate performance characteristics for the
send and receive sides of PCM channels applicable to 4-wire voice frequency
interfaces".
[29] CCITT Recommendations M.1020: "Characteristics of special quality".
[30] CCITT Recommendations M.1025: "Characteristics of special quality
international leased circuits with basic bandwidth conditioning".
[31] CCITT Recommendations M.1030: "Characteristics of ordinary quality
international leased circuits forming part of private switched telephone
networks".
[32] CCITT Recommendations M.1040: "Characteristics of ordinary quality
international leased circuits".

[33] CCITT Recommendation O.132 (1988), "Specification for a quantizing distortion

measuring apparatus using a sinusoidal test signal."
[34] CCITT Recommendation P.11: "Effect of transmission impairments".
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[35] CCITT Recommendation P.34: "Transmission characteristics of hands-free
telephones".
[36] CCITT Recommendation P.38: "Transmission characteristics of operator
telephone systems (OTS)".
[37] CCITT Recommendation P.50: "Artificial voices".
[38] CCITT Recommendation P.51 (1988), "Artificial mouths and artificial ears."
[39] CCITT Recommendation P.64 (1988), "Determination of sensitivity/frequency

characteristics of local telephone systems to permit calculation of their loudness

ratings."
[40] CCITT Recommendation P.76 (1988), "Determination of loudness ratings;
fundamental principles."
[41] CCITT Recommendation P.79 (1988), "Calculation of loudness ratings."
[42] CCITT Recommendation Q.35: "Technical characteristics of tones for the
telephone service".
[43] CCITT Recommendation Q.551: "Transmission characteristics of digital
exchanges".
[44] CCITT Blue Book (1988), Volume V, Supplement 13, "Noise spectra."
[45] ISO 3 - 1973, "Preferred numbers - series of preferred numbers."
1.3 Definitions and abbreviations

In addition to those below, the definitions and abbreviations used in this specification are listed in

GSM 01.04.
ADC Analogue to Digital Converter
ADPCM Adaptive Differential Pulse Code Modulation
AEC Acoustic Echo Control
BSC' Base Station Controller (excluding transmission systems
BTS' Base Transceiver Station (excluding transmission systems)
DAC Digital to Analogue Converter
DMR Digital Mobile Radio
DSI Digital Speech Interpolation
EEC Electric Echo Control
EL Echo Loss
ERP Ear Reference Point
FDM Frequency Division Multiplex
LSTR Listener Sidetone Rating
MRP Mouth Reference Point
OLR Overall Loudness Rating
PCM Pulse Code Modulation
POI Point of Interconnection (with PSTN)
RLR Receiver Loudness Rating
SLR Send Loudness Rating
STMR Sidetone Masking Rating
UPCMI 13-bit Uniform PCM Interface
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1.4 Introduction

Since the transmission quality and the conversational quality of the PLMN will in general be lower than the

quality of the PSTN connection due to coding distortion, delay, etc., only some transmission aspects can

be brought in line with CCITT Recommendations. It is therefore necessary to improve the overall quality

as much as possible by implementing proper routing and network configurations.

It should be recognised that the transmission plan for the pan-European PLMN cannot lead to major

changes in the PSTN. However, it is important to use the improvements in the evolving PSTN (e.g.

digitalization, introduction of echo cancellers) in an effective way.

The transmission requirements are in the first place based on international connections. When the quality

is sufficient for international connections, it can be assumed that the national connections will have the

same or better quality.

In order to obtain a sufficient quality in the connection, it is preferable to have digital connectivity between

the Base Station System (BSS) and the international exchange. The PLMN requirements are based on

this assumption. When this situation cannot be provided, a lower quality must temporarily be accepted.

This Recommendation consists of two parts: one will deal with network configurations, the other with

transmission performance.

The part about network configurations gives information about the reference connections, on which the

transmission plan is based. Furthermore, some guidelines are presented for improvement of the

transmission quality in the evolving (digital) PSTN.

The part about transmission performance gives mainly characteristics of the transmission between MS

acoustic interface (MRP/ERP) and the interface between the PLMN and the PSTN (POI). For transmission

aspects where it is impossible to give overall characteristics, it is in some cases necessary to make

recommendations for individual parts of the equipment.

Unless otherwise stated, all references to CCITT Recommendations are from the Blue Book (1989).

Annex A considers the effects of the type of acoustic interfaces of the MS.
2 Network configurations
2.1 General
The basic configuration for the interworking with the PSTN is shown in figure 1.
2.2 Model of the PLMN

A more detailed model of the PLMN used for the consideration of transmission planning issues for speech

is shown in figure 2. This model represents the main functions required and does not necessarily imply

any particular physical realisation. Routing of calls is given in Recommendation GSM 03.04.

Any acoustic echo control is not specifically shown as it will be provided by analogue processing of digital

processing or a combination of both techniques.
2.3 Interfaces

The main interfaces identified within the GSM Recommendations are shown in figure 1. For the purposes

of this Recommendation, the Air Interface and the Point of Interconnect (POI) are identified along with two

other interfaces, Interface Z and a 13-bit Uniform PCM Interface (UPCMI). These interfaces are needed to

define the PLMN transmission characteristics and the overall system requirements.

The Air Interface is specified by GSM 05 series Recommendations and is required to achieve MS

transportability. Analogue measurements can be made at this point by using the appropriate radio termin

...

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