ETSI ETS 300 562 ed.3 (1995-10)

European digital cellular telecommunications system (Phase 2); Rate adaptation on the Mobile Station - Base Station System (MS - BSS) interface (GSM 04.21)

RE/SMG-040421PR2

Evropski digitalni celični telekomunikacijski sistem (faza 2) – Prilagoditev na hitrost vmesnika sistema mobilna postaja-bazna postaja (MS-BSS) (GSM 04.21)

General Information

• Status: Published
• Publication Date: 05-Oct-1995
• Technical Committee: SMG 4 - Data Services
• Current Stage: 12 - Completion
• Due Date: 13-Oct-1995
• Completion Date: 06-Oct-1995
• Ref Project: SIST ETS 300 562 E3:2003 - European digital cellular telecommunications system (Phase 2); Rate adaptation on the Mobile Station - Base Station System (MS - BSS) interface (GSM 04.21)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 562 E3:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±3ULODJRGLWHYQD
KLWURVWYPHVQLNDVLVWHPDPRELOQDSRVWDMDED]QDSRVWDMD06%66*60
European digital cellular telecommunications system (Phase 2); Rate adaptation on the
Mobile Station - Base Station System (MS - BSS) interface (GSM 04.21)
Ta slovenski standard je istoveten z: ETS 300 562 Edition 3
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 562 E3:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 562 E3:2003

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SIST ETS 300 562 E3:2003
EUROPEAN ETS 300 562
TELECOMMUNICATION September 1995
STANDARD Third Edition
Source: ETSI TC-SMG Reference: RE/SMG-040421PR2
ICS: 33.060.50
European digital cellular telecommunications system, Global System for Mobile communication
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Rate adaption on the Mobile Station - Base Station System
(MS - BSS) Interface
(GSM 04.21)
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 - [e-mail]
X.400: Internet:
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 1995. All rights reserved.
New presentation - see History box

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ETS 300 562: September 1995 (GSM 04.21 version 4.6.0)
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 300 562: September 1995 (GSM 04.21 version 4.6.0)
Contents
Foreword .5
0 Scope .7
1 Normative references.7
2 Abbreviations.8
3 General approach.8
4 The RA0 Function .8
4.1 Asynchronous-to-Synchronous Conversion (RA0) .8
4.2 Break signal .8
4.3 Overspeed/Underspeed.9
4.4 Parity Bits.9
4.5 Flow Control.9
5 The RA1 Function .9
5.1 Network Independent Clocking.10
5.1.1 Multiframe Structure.10
5.1.2 Encoding and compensation.10
6 The RA2 Function .11
7 The RA1/RA1' Function.11
7.1 Radio Interface rate of 12 kbit/s.12
7.2 Radio Interface rate of 6 kbit/s.13
7.3 Radio Interface rate of 3,6 kbit/s (transparent services only) .14
7.4 Synchronisation .15
7.5 Idle frames .15
8 The RA1' Function.15
9 Support of Non-Transparent Bearer Services.15
Annex A (Informative): Stacks of rate adaptation.19
History.20

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ETS 300 562: September 1995 (GSM 04.21 version 4.6.0)
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 defines the rate adaptation functions to be used in Mobile Stations (MS) for adapting terminal
interface data rates to the Mobile Station - Base Station System (MS - BSS) interface data rates, within
the European digital cellular telecommunications system (Phase 2).
This ETS correspond to GSM technical specification, GSM 04.21 version 4.6.0.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS is not entirely in accordance with the ETSI/PNE rules.
Reference is made within this ETS to GSM Technical Specifications (GSM-TS) (note).
Reference is also made within this draft ETS to GSM 07.xx. series. The specifications in the series can be
identified, with their full title, within the normative reference Clause of this draft ETS by the first two digits
of their GSM reference number e.g. GSM 07.xx series, refers to GSM 07.01, GSM 07.02, .etc.
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-TS). 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: 30 September 1995
Date of latest announcement of this ETS (doa): 31 December 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1996
Date of withdrawal of any conflicting National Standard (dow): 30 June 1996

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ETS 300 562: September 1995 (GSM 04.21 version 4.6.0)
0 Scope
This European Telecommunication Standard (ETS) defines the rate adaptation functions to be used in
GSM PLMN Mobile Stations for adapting terminal interface data rates to the MS-BSS interface data rates
in accordance with GSM 03.10.
The provision of these functions will depend on the services a particular station is designed to support.
NOTE: This ETS should be considered together with GSM Specification 08.20 (Rate
Adaptation on the BSS-MSC Interface) to give a complete description of PLMN rate
adaptation.
1 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.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunication system
(Phase 2); Abbreviations and acronyms".
[2] GSM 03.10 (ETS 300 528): "European digital cellular telecommunication system
(Phase 2); GSM Public Land Mobile Network (PLMN) connection types".
[3] GSM 05.03 (ETS 300 575): "European digital cellular telecommunication system
(Phase 2); Channel coding".
[4] GSM 07.01 (ETS 300 582): "European digital cellular telecommunication system
(Phase 2); General on Terminal Adaptation Functions (TAF) for Mobile Stations
(MS)".
[5] GSM 07.02 (ETS 300 583): "European digital cellular telecommunication system
(Phase 2); Terminal Adaptation Functions (TAF) for services using
asynchronous bearer capabilities".
[6] GSM 07.03 (ETS 300 584): "European digital cellular telecommunication system
(Phase 2); Terminal Adaptation Functions (TAF) for services using synchronous
bearer capabilities".
[7] GSM 07.05 (ETS 300 585): "European digital cellular telecommunication system
(Phase 2); Use of Data Terminal Equipment - Data Circuit terminating
Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell
Broadcast Service (CBS)".
[8] GSM 07.06 (ETS 300 586): "European digital cellular telecommunication system
(Phase 2); Use of the V series Data Terminal Equipment - Data Circuit
terminating Equipment (DTE - DCE) interface at the Mobile Station (MS) for
Mobile Termination (MT) configuration".
[9] GSM 08.20 (ETS 300 591): "European digital cellular telecommunication system
(Phase 2); Rate adaption on the Base Station System - Mobile-services
Switching Centre (BSS - MSC) interface".
[10] CCITT Recommendation V.110: "Support of data terminal equipments (DTEs)
with V-Series interfaces by an integrated services digital network".
[11] CCITT Recommendation X.30: "Support of X.21,X.21 bis and X.20 bis based
terminal equipments (DTEs) by integrated services digital network (ISDN)".

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2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.
3 General approach
GSM 03.10 defines the PLMN connection types necessary to support the GSM PLMN data and telematic
services.
Within the MS there are several different data rate adaptation functions which are combined as shown in
GSM 03.10 as part of the connection type.
These functions are RA0, RA1, RA2, RA1' and RA1/RA1'. The RA0, RA1 and RA2 are equivalent to those
functions described in CCITT recommendation V.110.
The RA1' function is similar to RA1 but has a reduced bit rate output compatible with the coding scheme
proposed for data services on the radio interface.
The RA1/RA1' is a relay function, used as indicated in GSM 03.10.
4 The RA0 Function
4.1 Asynchronous-to-Synchronous Conversion (RA0)
The RA0 Function is only used with asynchronous interfaces. Incoming asynchronous data is padded by
the addition of stop elements to fit the nearest channel defined by (2 to the power n) times 600 bit/s. Thus
both 75 bit/s and 300 bit/s user data signalling rates shall be adapted to a synchronous 600 bit/s stream.
The resultant synchronous stream is fed to RA1 or RA1'.
Asynchronous user rate Synchronous user rate
0.6 kbit/s
≤ 0.6 kbit/s
1.2 kbit/s 1.2 kbit/s
2.4 kbit/s 2.4 kbit/s
4.8 kbit/s 4.8 kbit/s
9.6 kbit/s 9.6 kbit/s
4.2 Break signal
The RA0 shall detect and transmit the break signal in the following fashion:
If the converter detects M to 2M+3 bits, all of start polarity, where M is the number of bits per character in
the selected format including start and stops bits, the converter shall transmit 2M+3 bits of start polarity.
If the converter detects more than 2M+3 bits all of start polarity, the converter shall transmit all these bits
as start polarity.
The 2M+3 or more bits of start polarity received from the transmitting sides shall be output to the receiving
terminal.
The terminal must transmit on circuit 103 at least 2M bits stop polarity after the start polarity break signal
before sending further data character. The converter shall then regain character synchronism from the
following stop to start transition.

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4.3 Overspeed/Underspeed
A RA0 shall insert additional stop elements when its associated terminal is transmitting with a lower than
nominal character rate. If the terminal is transmitting characters with an overspeed of up to 1%, the
asynchronous-to-synchronous converter may delete stop elements as often as is necessary to a
maximum of one for every eight characters at 1% overspeed. The converter on the receiving side shall
detect the deleted stop elements and reinsert them in the received data stream (circuit 104).
The realization of overspeed handling, as described above, at the interface to the associated terminal is
implementation dependent. Possible implementations are e.g. the reduction of the length of the stop
elements according to V.110 or increased data rates between the TA and terminal.
4.4 Parity Bits
Possible parity bits included in the user data are considered as data bits by the RA0 function (and RA1
function).
4.5 Flow Control
Where applicable, this function is as specified in the relevant terminal adaptation function Specification
(GSM 07 series).
5 The RA1 Function
This function is used to adapt between the synchronous user rates, or the output of the RA0 function and
the intermediate rate of 8 or 16 kbit/s.
Synchronous user rate Intermediate rate
8 kbit/s
≤ 2.4 kbit/s
4.8 kbit/s 8 kbit/s
9.6 kbit/s 16 kbit/s
A CCITT V.110 80 bits frame is constructed using the user data bits received (from the RA0 in the
asynchrounous case), the values of the S bits are deduced from the R interface.
Adaptation of 600 bit/s to 8Kbit/s is performed by 8 times consecutive duplication of each user data bit.
Adaptation of 1200 bit/s to 8 Kbit/s is performed by 4 times consecutive duplication of each user data bit.
Adaptation of 2400 bit/s to 8kbit/s is performed by 2 times consecutive duplication of each user data bit.
Adaptation of 4800 bit/s to 8 Kbit/s is performed by transmitting the bit stream with no duplication.
Adaptation of 9600 bit/s to 16 Kbit/s is performed by transmitting the bit stream with no duplication (the
emitting period is halfed with respect to the 4800 bit/s case).
The CCITT V.110 80 bit frame shown in Figure 3 is used. The D bits are used to convey the user data and
the S and X bits are used to convey channel control information according to the relevant terminal adapter
function Specification.
The E bits are used to convey the following information:
i) User Data Rate - E1, E2, E3 (see Figure 4)
ii) Network Independent Clocking - E4, E5, E6
iii) Multiframe Synchronisation - E7
The order of transmission of the 80 bit frame is from left to right and top to bottom.

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5.1 Network Independent Clocking
Synchronous data signals received by the MT from the DTE at the MS or by IWF from the modem on the
PSTN may not be synchronised to the PLMN. The following method shall be used to enable transfer of
those data signals and the corresponding bit timing information via the V.110 frames. Such a situation
would exist where the signals received from the modem at the IWF require its own clock or where the
signals received from the DTE at the MS employs its own network independent clock. In any case, the
frequency tolerance of the clocks involved is 100 ppm.
5.1.1 Multiframe Structure
The transmitting end of the GSM PLMN connection shall establish a multiframe structure utilising bit E7
consisting of four frames by setting E7 in every fourth frame to binary 0. This structure is identical to the
use of E7 in V.110 (and X.30) except that such a multiframe structure will exist
...