SIST ETS 300 574 E2:2003

• Abstract:

  ....

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.20 - Transmission systems
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 574 ed.2 (1996-01) - Digital cellular telecommunications system (Phase 2) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02)

SIST ETS 300 574 E2:2003 is the Slovenian adoption of ETS 300 574 Edition 2, a European Telecommunications Standard for GSM Phase 2 radio access. It specifies how logical channels are multiplexed and carried on the radio path, including the physical resource, burst structure, time structure, frequency hopping, and channel mapping used by GSM radio systems.

What does SIST ETS 300 574 E2:2003 specify?

SIST ETS 300 574 E2:2003 specifies the physical channels of the GSM radio sub-system and the way logical channels are mapped onto them. In practice, it is the document that links GSM signalling and traffic channel functions to actual radio frequencies, timeslots, TDMA frames, and bursts.

The standard is organized into:

• Introduction and scope
• Logical channels
• The physical resource
• Physical channels
• Mapping of logical channels onto physical channels
• Section 7 tables that define the detailed channel mappings

Its scope includes frequency hopping, TDMA frames, timeslots, and bursts, together with the definitions needed to support traffic and control channels on the air interface.

What are the key requirements of SIST ETS 300 574 E2:2003?

SIST ETS 300 574 E2:2003 defines the GSM radio channel structure from the logical layer down to burst timing. The most important practical effect is that a network designer must choose the right channel type, allocation, and mapping rules so that mobiles can access the cell, page properly, and carry speech or data on assigned traffic channels.

Logical channel classes and traffic rates

Clause 3 separates logical channels into traffic channels (TCH) and control channels. The traffic channels include full rate and half rate forms, with specific variants for speech and user data such as TCH/FS, TCH/HS, TCH/F9.6, TCH/F4.8, TCH/H4.8, TCH/H2.4, and TCH/F2.4.

This matters because the network must assign the right channel type for the service being carried. Speech, circuit-switched data, and low-rate data do not use the same logical channel variants.

Control channel structure and broadcast behavior

Clause 3 defines broadcast, common, and dedicated control channels. It includes FCCH for frequency correction, SCH for frame synchronization and base transceiver station identification, BCCH for broadcast cell information, and common control channels such as PCH, RACH, and AGCH.

The BCCH parameters control how common control capacity is organized. The standard uses CCCH_CONF, BS_AG_BLKS_RES, and BS_PA_MFRMS to determine common control structure, access grant reservation, and paging repetition.

Physical resource, frame timing, and alignment

Clause 4 states that the available radio resource is divided by frequency and time. It defines radio frequency channels (RFCHs), cell allocation (CA), mobile allocation (MA), and the BCCH carrier, which is one channel in the cell allocation used for synchronization and BCCH.

A timeslot lasts 3/5200 seconds and eight timeslots make one TDMA frame. The uplink is delayed by three timeslots relative to the downlink at the base transceiver station, and TDMA frames are cyclically numbered through a hyperframe. This timing is what allows a mobile to transmit and receive without doing both at once.

Burst types and burst contents

Clause 5 defines the physical bursts used on the air interface: normal burst (NB), frequency correction burst (FB), synchronization burst (SB), dummy burst, and access burst (AB). The clause gives the bit structure and purpose of each burst, including tail bits, training sequence bits, and guard periods.

This is important for implementation and testing because each channel type uses a specific burst form. The document also links the training sequence code (TSC) for broadcast and common control channels to the base station color code (BCC).

Frequency hopping and channel assignment parameters

Clause 5.6 and Clause 6.2 define the parameters needed to map a channel in frequency: CA, FN, MA, MAIO, and HSN. The hopping sequence generation algorithm uses these values to select the radio frequency channel for a given frame.

The standard distinguishes cyclic hopping, where HSN = 0, from the other hopping mode. It also states that the BCCH carrier does not use frequency hopping for channels that support BCCH, and it gives a specific caution about cyclic hopping in one allocation pattern. In practice, this is the rule set used by the BSS to generate a valid hopping sequence.

Time mapping, CCCH organization, and paging

Clause 6.3 to 6.5 define how logical channels are placed into multiframe structure and how paging is organized. The BCCH data determine whether common control channels are combined with SDCCH/4, how many paging and access grant blocks are available, and how paging is spread across multiframes.

The standard defines CCCH_GROUP and PAGING_GROUP from the IMSI and the paging capacity. That means each idle mobile knows which paging blocks it should monitor, which is central to battery-saving idle mode operation.

SMSCB on CBCH

Clause 6.5.4 defines Short Message Service Cell Broadcast (SMSCB) on the CBCH. The message is sent in four consecutive multiframes, with the header in the multiframe where TB = 0.

This matters for broadcast messaging because it ties SMS cell broadcast to a fixed radio schedule and to the BCCH parameters that control the common control channel layout.

What terms does SIST ETS 300 574 E2:2003 define?

• Cell allocation (CA) - The set of radio frequency channels assigned to a cell; one of them is the BCCH carrier.
• Mobile allocation (MA) - The subset of radio frequency channels used by a particular mobile for frequency hopping.
• Mobile allocation index offset (MAIO) - The offset used when selecting the hopping channel within the mobile allocation.
• Hopping sequence number (HSN) - The parameter that selects the hopping sequence generation method.
• Training sequence code (TSC) - The code that selects the training sequence bits used in a burst.
• Base transceiver station identity code (BSIC) - The SCH parameter that identifies the base transceiver station and includes PLMN colour code and BS colour code.
• Reduced TDMA frame number (RFN) - The SCH information that carries the reduced representation of the TDMA frame number.
• Common control channel (CCCH) - The common control resource used for paging, random access, and access grants.

Who uses SIST ETS 300 574 E2:2003?

SIST ETS 300 574 E2:2003 is used by GSM radio network engineers, base transceiver station and base station system implementers, and operators configuring cell capacity and paging behavior. It is also used by test laboratories and conformity assessors that need to verify channel structure, burst formats, timing, and channel mapping.

Procurement and quality teams use it when they need to check whether a GSM radio subsystem or implementation follows the Phase 2 air-interface channel structure. It is especially relevant for work on cell planning, frequency hopping configuration, idle-mode paging design, and support for speech, data, and broadcast messaging.

What changed in SIST ETS 300 574 E2:2003 from the previous edition?

The document history identifies this publication as the second edition of ETS 300 574. The history also records the first edition in September 1995 and a later conversion to PDF in March 1996.

Which standards are used with SIST ETS 300 574 E2:2003?

This standard relies on several GSM specifications for definitions and detailed behavior:

• GSM 01.04 - Supplies the abbreviations and acronyms used throughout the document.
• GSM 03.03 - Defines numbering, addressing, and identification, including items such as BSIC and IMSI.
• GSM 04.03 - Defines channel structures and access capabilities, including permitted channel combinations.
• GSM 04.06 - Provides the data link layer specification used for SCH bit ordering and related signaling handling.
• GSM 04.08 - Provides mobile radio interface layer 3 procedures and the BCCH parameters used for CCCH organization and paging.
• GSM 05.03 - Defines channel coding used for burst contents such as SCH and the encrypted bits in bursts.
• GSM 05.04 - Defines modulation and the phase and amplitude characteristics that affect burst transmission.
• GSM 05.05 - Defines radio transmission and reception, RF channel definitions, and guard-period ramping behavior.
• GSM 05.08 - Defines radio subsystem link control, including BCCH-related operation and SID frame handling.
• GSM 05.10 - Defines radio subsystem synchronization, including TDMA frame numbering and frame alignment behavior.

What does the SIST ETS 300 574 E2:2003 document contain?

The document contains the burst definitions and timing rules for NB, FB, SB, dummy burst, and AB, together with the bit-level layouts used for those bursts. It also contains the hopping sequence generation method, including the parameter list and the lookup table used when HSN is not zero.

Section 7 contains the detailed mapping tables that show which logical channels can use which physical channels, burst types, repeat lengths, and interleaved block positions. Those tables are the main implementation aid for radio channel assignment, paging organization, and traffic-channel mapping.

The document also includes the formulas and tables needed to derive CCCH_GROUP, PAGING_GROUP, and paging block selection from BCCH parameters and IMSI. In practice, those parts support BTS configuration, paging scheduling, and verification of the radio access behavior in GSM Phase 2 systems.

SLOVENSKI STANDARD
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±0XOWLSOHNVLUDQMHLQ
VRGRVWRSQDUDGLMVNLSRWL*60
Digital cellular telecommunications system (Phase 2) (GSM); Multiplexing and multiple
access on the radio path (GSM 05.02)
Ta slovenski standard je istoveten z: ETS 300 574 Edition 2
ICS:
33.040.20 Prenosni sistem Transmission systems
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 574
TELECOMMUNICATION January 1996
STANDARD Second Edition
Source: ETSI TC-SMG Reference: RE/SMG-020502P
ICS: 33.060.50
Digital cellular telecommunications system, Global System for Mobile communications (GSM)
Key words:
Digital cellular telecommunications system (Phase 2);
Multiplexing and multiple access on the radio path
(GSM 05.02)
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 1996. All rights reserved.
New presentation - see History box

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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
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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 300 574: January 1996 (GSM 05.02 version 4.5.0)
Contents
Foreword .5
1 Introduction.7
1.1 Scope.7
1.2 Normative references .7
1.3 Definitions and abbreviations.7
2 General.7
3 Logical channels.8
3.1 General .8
3.2 Traffic channels .8
3.2.1 General.8
3.2.2 Speech traffic channels.8
3.2.3 Data traffic channels.8
3.3 Control channels.8
3.3.1 General.8
3.3.2 Broadcast channels.9
3.3.2.1 Frequency correction channel (FCCH).9
3.3.2.2 Synchronization channel (SCH).9
3.3.2.3 Broadcast control channel (BCCH) .9
3.3.3 Common control type channels, known when combined as a common
control channel (CCCH): .10
3.3.4 Dedicated control channels.10
3.3.5 Cell Broadcast Channel (CBCH).10
3.4 Combination of channels .10
4 The physical resource .10
4.1 General .10
4.2 Radio frequency channels .10
4.2.1 Cell allocation and mobile allocation .10
4.2.2 Downlink and uplink .10
4.3 Timeslots and TDMA frames.11
4.3.1 General.11
4.3.2 Timeslot number .11
4.3.3 TDMA frame number.11
5 Physical channels.11
5.1 General .11
5.2 Bursts.12
5.2.1 General.12
5.2.2 Types of burst and burst timing.12
5.2.3 Normal burst (NB) .12
5.2.4 Frequency correction burst (FB).13
5.2.5 Synchronization burst (SB).13
5.2.6 Dummy burst.13
5.2.7 Access burst (AB).14
5.2.8 Guard period .14
5.3 Physical channels and bursts .14
5.4 Radio frequency channel sequence.15
5.5 Timeslot and TDMA frame sequence.15
5.6 Parameters for channel definition and assignment .15
5.6.1 General.15
5.6.2 General parameters .15
5.6.3 Specific parameters .15
6 Mapping of logical channels onto physical channels.16

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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
6.1 General .16
6.2 Mapping in frequency of logical channels onto physical channels.16
6.2.1 General.16
6.2.2 Parameters.16
6.2.3 Hopping sequence generation.16
6.2.4 Specific cases.18
6.2.5 Change in the frequency allocation of a base transceiver station .18
6.3 Mapping in time of logical channels onto physical channels.18
6.3.1 General.18
6.3.2 Key to the mapping table of section 7.18
6.3.3 Mapping of TCH/F9.6, TCH/F4.8, TCH/H4.8 and TCH/H2.4 .19
6.3.4 Mapping of BCCH data.19
6.3.5 Mapping of SID Frames.19
6.4 Permitted channel combinations.19
6.5 Operation of channels and channel combinations .20
6.5.1 General.20
6.5.2 Determination of CCCH_GROUP and PAGING_GROUP .21
6.5.3 Determination of specific paging multiframe and paging block index .21
6.5.4 Short Message Service Cell Broadcast (SMSCB).22
History.36

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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
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 physical channels of the radio sub-system required to support the logical channels
used within the digital cellular telecommunications system (Phase 2).
This ETS correspond to GSM technical specification, GSM 05.02 version 4.5.0.
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 Technical Specifications (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 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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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
1 Introduction
1.1 Scope
This European Telecommunication Standard (ETS) defines the physical channels of the radio sub-system
required to support the logical channels. It includes a description of the logical channels and the definition
of frequency hopping, TDMA frames, timeslots and bursts.
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.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunication system
(Phase 2); Abbreviations and acronyms".
[2] GSM 03.03 (ETS 300 523): "European digital cellular telecommunication system
(Phase 2); Numbering, addressing and identification".
[3] GSM 04.03 (ETS 300 552): "European digital cellular telecommunication system
(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Channel
structures and access capabilities".
[4] GSM 04.06 (ETS 300 555): "European digital cellular telecommunication system
(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Data Link
(DL) layer specification".
[5] GSM 04.08 (ETS 300 557): "European digital cellular telecommunication system
(Phase 2); Mobile radio interface layer 3 specification".
[6] GSM 05.03 (ETS 300 575): "European digital cellular telecommunication system
(Phase 2); Channel coding".
[7] GSM 05.04 (ETS 300 576): "European digital cellular telecommunication system
(Phase 2); Modulation".
[8] GSM 05.05 (ETS 300 577): "European digital cellular telecommunication system
(Phase 2); Radio transmission and reception".
[9] GSM 05.08 (ETS 300 578): "European digital cellular telecommunication system
(Phase 2); Radio subsystem link control".
[10] GSM 05.10 (ETS 300 579): "European digital cellular telecommunication system
(Phase 2); Radio subsystem synchronisation".
1.3 Definitions and abbreviations
Definitions and abbreviations used in this specification are listed in GSM 01.04.
2 General
The radio subsystem is required to support a certain number of logical channels that can be separated
into two overall categories as defined in GSM 04.03:
i) The traffic channels (TCH's).
ii) The control channels.
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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
More information is given about these logical channels in section 3 which also defines a number of special
channels used by the radio sub-system.
Section 4 of this document describes the physical resource available to the radio sub-system, section 5
defines physical channels based on that resource and section 6 specifies how the logical channels shall
be mapped onto physical channels. Figure 1 depicts this process.
3 Logical channels
3.1 General
This section describes the logical channels that are supported by the radio subsystem.
3.2 Traffic channels
3.2.1 General
Traffic channels (TCH's) are intended to carry either encoded speech or user data. Two general forms of
traffic channel are defined:
i) Full rate traffic channel (TCH/F). This channel carries information at a gross rate of 22.8
kbits/s.
ii) Half rate traffic channel (TCH/H). This channel carries information at a gross rate of 11.4
kbit/s.
The specific traffic channels available in the categories of speech and user data are defined in the
sections following.
3.2.2 Speech traffic channels
The following traffic channels are defined to carry encoded speech:
i) Full rate traffic channel for speech (TCH/FS).
ii) Half rate traffic channel for speech (TCH/HS).
3.2.3 Data traffic channels
The following traffic channels are defined to carry user data:
i) Full rate traffic channel for 9.6 kbit/s user data (TCH/F9.6).
ii) Full rate traffic channel for 4.8 kbit/s user data (TCH/F4.8).
iii) Half rate traffic channel for 4.8 kbit/s user data (TCH/H4.8).
iv) Half rate traffic channel for ≤ 2.4 kbit/s user data (TCH/H2.4).
v) Full rate traffic channel for ≤ 2.4 kbit/s user data (TCH/F2.4)
3.3 Control channels
3.3.1 General
Control channels are intended to carry signalling or synchronization data. Three categories of control
channel are defined: broadcast, common and dedicated. Specific channels within these categories are
defined in the sections following.

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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
3.3.2 Broadcast channels
3.3.2.1 Frequency correction channel (FCCH)
The frequency correction channel carries information for frequency correction of the mobile station. It is
required only for the operation of the radio sub-system.
3.3.2.2 Synchronization channel (SCH)
The synchronization channel carries information for frame synchronization of the mobile station and
identification of a base transceiver station. It is required only for the operation of the radio sub-system.
Specifically the synchronization channel shall contain two encoded parameters:
a) Base transceiver station identity code (BSIC): 6 bits (before channel coding) consists of 3 bits
of PLMN colour code with range 0 to 7 and 3 bits of BS colour code with range 0 to 7 as
defined in GSM 03.03.
b) Reduced TDMA frame number (RFN): 19 bits (before channel coding) =
T1 (11 bits) range 0 to 2047 = FN div ( 26 x 51)
T2 (5 bits) range 0 to 25  = FN mod 26
T3' (3 bits) range 0 to 4   = (T3 - 1) div 10
where
T3 (6 bits) range 0 to 50 = FN mod 51
and
FN = TDMA frame number as defined in section 4.3.3.
GSM 04.06 and GSM 04.08 specify the precise bit ordering, GSM 05.03 the channel coding of the above
parameters and GSM 05.10 defines how the TDMA frame number can be calculated from T1, T2, and
T3'.
3.3.2.3 Broadcast control channel (BCCH)
The broadcast control channel broadcasts general information on a base transceiver station per base
transceiver station basis. Of the many parameters contained in the BCCH, the use of the following
parameters, as defined in GSM 04.08 are referred to in section 6.5:
a) CCCH_CONF which indicates the organization of the common control channels:
From this parameter, the number of common control channels (BS_CC_CHANS) and
whether or not CCCH or SDCCH are combined (BS_CCCH_SDCCH_COMB = true or false)
are derived as follows:
CCCH_CONF BS_CC_CHANS BS_CCCH_SDCCH_COMB
000 1 false
001 1 true
010 2 false
100 3 false
110 4 false
b) BS_AG_BLKS_RES which indicates the number of blocks on each common control channel
reserved for access grant messages:
3 bits (before channel coding) range 0 to 7.

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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
c) BS_PA_MFRMS which indicates the number of 51 TDMA frame multiframes between
transmission of paging messages to mobiles of the same paging group:
3 bits (before channel coding) range 2 to 9.
3.3.3 Common control type channels, known when combined as a common control channel
(CCCH):
i) Paging channel (PCH): Downlink only, used to page mobiles.
ii) Random access channel (RACH): Uplink only, used to request allocation of a SDCCH.
iii) Access grant channel (AGCH): Downlink only, used to allocate a SDCCH or directly a TCH.
3.3.4 Dedicated control channels
i) Slow, TCH/F associated, control channel (SACCH/TF)
ii) Fast, TCH/F associated, control channel (FACCH/F)
iii) Slow, TCH/H associated, control channel (SACCH/TH)
iv) Fast, TCH/H associated, control channel (FACCH/H)
v) Stand alone dedicated control channel (SDCCH/8)
vi) Slow, SDCCH/8 associated, control channel (SACCH/C8)
vii) Stand alone dedicated control channel, combined with CCCH (SDCCH/4)
viii) Slow, SDCCH/4 associated, control channel (SACCH/C4)
3.3.5 Cell Broadcast Channel (CBCH)
The CBCH, downlink only, is used to carry the short message service cell broadcast (SMSCB). The
CBCH uses the same physical channel as the SDCCH.
3.4 Combination of channels
Only certain combinations of channels are allowed as defined in GSM 04.03. Section 6.4 lists the
combinations in relation to basic physical channels.
4 The physical resource
4.1 General
The physical resource available to the radio sub-system is an allocation of part of the radio spectrum. This
resource is partitioned both in frequency and time. Frequency is partitioned by radio frequency channels
(RFCHs) divided into bands as defined in GSM 05.05. Time is partitioned by timeslots and TDMA frames
as defined in section 4.3 of this document.
4.2 Radio frequency channels
4.2.1 Cell allocation and mobile allocation
GSM 05.05 defines radio frequency channels (RFCHs), and allocates numbers to all the radio frequency
channels available to the system. Each cell is allocated a subset of these channels, defined as the cell
allocation (CA). One radio frequency channel of the cell allocation shall be used to carry synchronization
information and the BCCH, this shall be known as BCCH carrier. The subset of the cell allocation,
allocated to a particular mobile, shall be known as the mobile allocation (MA).
4.2.2 Downlink and uplink
The downlink comprises radio frequency channels used in the base transceiver station to mobile station
direction.
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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
The uplink comprises radio frequency channels used in the mobile station to base transceiver station
direction.
4.3 Timeslots and TDMA frames
4.3.1 General
A timeslot shall have a duration of 3/5200 seconds (≈ 577 μs). Eight timeslots shall form a TDMA frame
(≈ 4.62 ms in duration).
At the base transceiver station the TDMA frames on all of the radio frequency channels in the downlink
shall be aligned. The same shall apply to the uplink (see GSM 05.10).
At the base transceiver station the start of a TDMA frame on the uplink is delayed by the fixed period of 3
timeslots from the start of the TDMA frame on the downlink (see Figure 2).
At the mobile station this delay will be variable to allow adjustment for signal propagation delay. The
process of adjusting this advance is known as adaptive frame alignment and is detailed in GSM 05.10.
The staggering of TDMA frames used in the downlink and uplink is in order to allow the same timeslot
number to be used in the downlink and uplink whilst avoiding the requirement for the mobile station to
transmit and receive simultaneously. The period includes time for adaptive frame alignment, transceiver
tuning and receive/transmit switching (see Figure 4).
4.3.2 Timeslot number
The timeslots within a TDMA frame shall be numbered from 0 to 7 and a particular timeslot shall be
referred to by its timeslot number (TN).
4.3.3 TDMA frame number
TDMA frames shall be numbered by a frame number (FN). The frame number shall be cyclic and shall
have a range of 0 to FN_MAX where FN_MAX = (26 x 51 x 2048) -1 = 2715647 as defined in GSM 05.10.
The frame number shall be incremented at the end of each TDMA frame.
The complete cycle of TDMA frame numbers from 0 to FN_MAX is defined as a hyperframe. A
hyperframe consists of 2048 superframes where a superframe is defined as 26 x 51 TDMA frames. A 26
TDMA frame multiframe is used to support traffic and associated control channels and a 51 TDMA frame
multiframe is used to support broadcast, common control and stand alone dedicated control (and their
associated control) channels. Hence a superframe may be considered as 51 traffic/associated control
multiframes or 26 broadcast/common control multiframes.
The need for a hyperframe of a substantially longer period than a superframe arises from the
requirements of the encryption process which uses FN as an input parameter.
5 Physical channels
5.1 General
A physical channel uses a combination of frequency and time division multiplexing and is defined as a
sequence of radio frequency channels and time slots. The complete definition of a particular physical
channel consists of a description in the frequency domain, and a description in the time domain.
The description in the frequency domain is addressed in section 5.4, the description in the time domain is
addressed in section 5.5.
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ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
5.2 Bursts
5.2.1 General
A burst is a period of R.F. carrier which is modulated by a data stream. A burst therefore represents the
physical content of a timeslot.
5.2.2 Types of burst and burst timing
A timeslot is divided into 156.25 bit periods. A particular bit period within a timeslot is referenced by a bit
number (BN), with the first bit period being numbered 0, and the last (1/4) bit period being numbered 156.
In the sections following the transmission timing of a burst within a timeslot is defined in terms of bit
number. The bit with the lowest bit number is transmitted first.
Different types of burst exist in the system. One characteristic of a burst is its useful duration. This
document, in the sections following, defines four full bursts of 147 bits useful duration, and one short burst
of 87 bits useful duration. The useful part of a burst is defined as beginning from half way through bit
number 0. The definition of the useful part of a burst needs to be considered in conjunction with the
requirements placed on the phase and amplitude characteristics of a burst as specified in GSM 05.04 and
05.05.
The period between bursts appearing in successive timeslots is termed the guard period. Section 5.2.8
details constraints which relate to the guard period.
5.2.3 Normal burst (NB)
Bit Number Length Contents Definition
(BN) of field of field
0 - 2 3 tail bits (below)
3 - 60 58 encrypted bits (e0 . e57) 05.03
61 - 86 26 training sequence bits (below)
87 - 144 58 encrypted bits (e58 . e115) 05.03
145 - 147 3 tail bits (below)
(148 - 156 8,25 guard period (bits) section 5.2.8)
- where the 'tail bits' are defined as modulating bits with states as follows:
(BN0, BN1, BN2) = (0, 0, 0) and
(BN145, BN146, BN147) = (0, 0, 0)
- where the 'training sequence bits' are defined as modulating bits with states as given in the
following table according to the training sequence code, TSC. For broadcast and common control
channels, the TSC must be equal to the BCC, as defined in GSM 03.03 and as described in this
technical specification in section 3.3.2.
Training Training sequence bits
Sequence (BN61, BN62 . BN86)
Code (TSC)
0 (0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1)
1 (0,0,1,0,1,1,0,1,1,1,0,1,1,1,1,0,0,0,1,0,1,1,0,1,1,1)
2 (0,1,0,0,0,0,1,1,1,0,1,1,1,0,1,0,0,1,0,0,0,0,1,1,1,0)
3 (0,1,0,0,0,1,1,1,1,0,1,1,0,1,0,0,0,1,0,0,0,1,1,1,1,0)
4 (0,0,0,1,1,0,1,0,1,1,1,0,0,1,0,0,0,0,0,1,1,0,1,0,1,1)
5 (0,1,0,0,1,1,1,0,1,0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,0)
6 (1,0,1,0,0,1,1,1,1,1,0,1,1,0,0,0,1,0,1,0,0,1,1,1,1,1)
7 (1,1,1,0,1,1,1,1,0,0,0,1,0,0,1,0,1,1,1,0,1,1,1,1,0,0)
Under certain circumstances (e.g. DTX operation) only half of the encrypted bits present in a normal burst
will contain useful information. In such cases the binary state of the remaining bits is not specified.

Page 13
ETS 300 574: January 1996 (GSM 05.02 version 4.5.0)
5.2.4 Frequency correction burst (FB)
Bit Number length Contents Definition
(BN) of field of field
0 - 2 3 tail bits (below)
3 - 144 142 fixed bits (below)
145 - 147 3 tail bits (below)
(148 - 156 8,25 guard period (bits) section 5.2.8)
- where the 'tail bits' are defined as modulating bits with states as follows:
(BN0, BN1, BN2) = (0, 0, 0) and
(BN145, BN146, BN147) = (0, 0, 0)
- where the 'fixed bits' are defined as modulating bits with states as follows:
(BN3, BN4 . BN144)   = (0, 0 . 0)
NOTE: This burst is equivalent to unmodulated carrier with a +1625/24 kHz frequency offset,
above the nominal carrier frequency.
5.2.5 Synchronization burst (SB)
Bit Number Length Contents Definition
(BN) of field of field
0 - 2 3 tail bits (below)
3 - 41 39 encrypted bits (e0 . e38) 05.03
42 - 105 64 extended training sequence bits (below)
106 - 144 39 encrypted bits (e39 . e77) 05.03
145 - 147 3 tail bits (below)
(148 - 156 8,25 guard period (bits) section 5.2.8)
- where the 'tail bits' are defined as modulating bits with states as follows:
(BN0, BN1, BN2) = (0, 0, 0) and
(BN145, BN146, BN147) = (0, 0, 0)
- where the 'extended training sequence bits' are defined as modulating bits with states as follows:
(BN42, BN43 . BN105) = (1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0,
0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0,
1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1)
5.2.6 Dummy burst
Bit Number Length Contents Definition
(BN) of field of field
0 - 2 3 tail bits (below)
3 - 60 58 mixed bits (below)
61 - 86 26 training sequence bits
...