ETSI ETS 300 908 ed.1 (1997-04)

Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 5.2.1)

DE/SMG-020502QR1

Digitalni celični telekomunikacijski sistem (faza 2+) – Multipleksiranje in sodostop na radijski poti (GSM 05.02, različica 5.2.1)

General Information

• Status: Published
• Publication Date: 12-May-1997
• Technical Committee: SMG 2 - Radio
• Current Stage: 12 - Completion
• Due Date: 11-Apr-1997
• Completion Date: 13-May-1997
• Ref Project: SIST ETS 300 908 E1:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 5.2.1)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 908 E1:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±0XOWLSOHNVLUDQMHLQVRGRVWRS
QDUDGLMVNLSRWL*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple
access on the radio path (GSM 05.02 version 5.2.1)
Ta slovenski standard je istoveten z: ETS 300 908 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 908 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 908 E1:2003

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SIST ETS 300 908 E1:2003
EUROPEAN ETS 300 908
TELECOMMUNICATION April 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-020502QR1
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Multiplexing and multiple access on the radio path
(GSM 05.02 version 5.2.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
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 1997. All rights reserved.

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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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Contents
Foreword .5
1 Scope .7
1.1 Normative references .7
1.2 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 .11
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
6.1 General .16

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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 clause 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
6.4.1 Permitted channel combinations onto a basic physical channel. 20
6.4.2 Multislot configurations . 20
6.5 Operation of channels and channel combinations . 21
6.5.1 General . 21
6.5.2 Determination of CCCH_GROUP and PAGING_GROUP . 22
6.5.3 Determination of specific paging multiframe and paging block index. 22
6.5.4 Short Message Service Cell Broadcast (SMSCB). 22
6.5.5 Voice group and voice broadcast call notifications. 23
Annex A (normative): Phase 2 mobiles in a phase 1 infrastructure. 37
A.1 Scope. 37
A.2 Implementation options for TCH channels . 37
A.2.1 C0 filling on the TCH . 37
A.2.1.1 A dummy burst with (BN61,BN62,  BN86) = training sequence bits of
normal bursts. 37
A.2.1.2 A dummy burst with the "C0 filling training sequence. 37
A.2.1.3 A dummy burst with (BN61, BN62, BN86) mapped from the TSC bits of
normal bursts according to the table below . 37
A.2.1.4 Partial SID information. 37
A.2.2 Half burst filling. 37
A.2.2.1 Partial SID information from any associated SID frame; or. 37
A.2.2.2 The mixed bits of the dummy bursts (encrypted or not encrypted) . 37
A.2.3 Dummy burst Stealing flag . 37
A.2.4 Half burst Filling Stealing flag. 37
A.2.5 Allowed combinations. 38
A.3 Idle Channels. 38
Annex B (normative): Multislot capability. 39
B.1 MS classes for multislot capability. 39
B.2 Constraints imposed by the service selected . 40
B.3 Network requirements for supporting MS multislot classes. 40
History. 43

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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 of
the digital mobile cellular and personal communication systems operating in the 900 MHz and 1 800 MHz
band (GSM 900 and DCS 1 800).
This ETS is a GSM technical specification version 5, which incorporates GSM Phase 2+
enhancements/features to the version 4 GSM technical specification. The ETS from which this Phase 2+
ETS has evolved is Phase 2 GSM ETS 300 574 Edition 5 (GSM 05.02 version 4.8.1).
The contents of this ETS is subject to continuing work within TC-SMG and may change following formal
TC-SMG approval. Should TC-SMG modify the contents of this ETS, it will be resubmitted for OAP by
ETSI with an identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
y the third digit is incremented when editorial only changes have been incorporated in the
specification;
x the second digit is incremented for all other types of changes, i.e. technical enhancements,
corrections, updates, etc.
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 drafting rules.
Transposition dates
Date of adoption: 21 March 1997
Date of latest announcement of this ETS (doa): 31 July 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1998
Date of withdrawal of any conflicting National Standard (dow): 31 January 1998

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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.
1.1 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 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 03.03 (ETS 300 927): "Digital cellular telecommunications system
(Phase 2+); Numbering, addressing and identification".
[3] GSM 04.03: "Digital cellular telecommunications system (Phase 2+); Mobile
Station - Base Station System (MS - BSS) interface Channel structures and
access capabilities".
[4] GSM 04.06 (ETS 300 938): "Digital cellular telecommunications system
(Phase 2+); Mobile Station - Base Station System (MS - BSS) interface; Data
Link (DL) layer specification".
[5] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[6] GSM 05.03 (ETS 300 909): "Digital cellular telecommunications system
(Phase 2+); Channel coding".
[7] GSM 05.04 (ETS 300 959): "Digital cellular telecommunications system;
Modulation".
[8] GSM 05.05 (ETS 300 910): "Digital cellular telecommunications system
(Phase 2+); Radio transmission and reception".
[9] GSM 05.08 (ETS 300 911): "Digital cellular telecommunications system
(Phase 2+); Radio subsystem link control".
[10] GSM 05.10 (ETS 300 912): "Digital cellular telecommunications system
(Phase 2+); Radio subsystem synchronization".
1.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04 [1].
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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More information is given about these logical channels in clause 3 which also defines a number of special
channels used by the radio sub-system.
Clause 4 of this document describes the physical resource available to the radio sub-system, clause 5
defines physical channels based on that resource and clause 6 specifies how the logical channels shall be
mapped onto physical channels. Figure 1 depicts this process.
3 Logical channels
3.1 General
This clause 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 kbit/s.
ii) Half rate traffic channel (TCH/H). This channel carries information at a gross rate of
11,4 kbit/s.
All traffic channels are bi-directional unless otherwise stated. Unidirectional downlink full rate channels,
TCH/FD, are defined as the downlink part of the corresponding TCH/F.
Multiple full rate channels can be allocated to the same MS. This is referred to as multislot configurations,
which is defined in subclause 6.4.2.
The specific traffic channels available in the categories of speech and user data are defined in the clauses
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 clauses following.

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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 subclause 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 subclause 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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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.
iv) Notification channel (NCH): Downlink only, used to notify mobile stations of voice group and
voice broadcast calls.
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).
ix) slow, TCH/F associated, control channel for multislot configurations (SACCH/M).
All associated control channels have the same direction (bi-directional or unidirectional) as the
channels they are associated to. The unidirectional SACCH/MD is defined as the downlink part of
SACCH/M.
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. Subclause 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 subclause 4.3 of this ETS.
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).

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4.2.2 Downlink and uplink
The downlink comprises radio frequency channels used in the base transceiver station to mobile station
direction.
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 3/5 200 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 2 048 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 subclause 5.4, the description in the time domain
is addressed in subclause 5.5.

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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 clauses 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 clauses 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 consider
...