SIST ETS 300 575 E1:2003

• Abstract:

  A reference configuration of the transmission chain is shown in GSM 05 .01. According to this reference configuration, this technical specifi cation specifies the data blocks given to the encryption unit. It includes the specification of encoding, reordering, interleaving an d the stealing flag. It does not specify the channel decoding method. The definition is given for each kind of logical channel, starting fro m the data provided to the channel encoder by the speech coder, the da ta terminal equipment, or the controller of the MS or BS. The definiti ons of the logical channel types used in this technical specification are given in GSM 05.02, a summary is in annex 1.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• ICS: 35.040.99 - Other standards related to information coding
• 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
• Mandate: T-172-1
• Ref Project: ETSI ETS 300 575 ed.1 (1994-09) - European digital cellular telecommunications system (Phase 2); Channel coding (GSM 05.03)

SIST ETS 300 575 E1:2003 is the Slovenian adoption of ETS 300 575 Edition 1 from ETSI for European digital cellular telecommunications system Phase 2, GSM 05.03. It specifies how speech, data, and control-channel information is encoded, reordered, interleaved, and marked for burst stealing on the GSM radio path for mobile station and base station implementations.

What does SIST ETS 300 575 E1:2003 specify?

SIST ETS 300 575 E1:2003 specifies the data blocks delivered to the encryption unit in the GSM Phase 2 transmission chain. It covers channel coding for each logical channel type, but it does not specify the channel decoding method.

The document is organized into:

• Scope, normative references, and definitions
• General organization and naming conventions
• Traffic channels
• Control channels
• Annex A and Annex B, which summarize channel types and convolutional-code polynomials

Annex	What it covers
Annex A	Summary of channel types
Annex B	Summary of polynomials used for convolutional codes

This structure matters in practice because implementers can use the clause for the channel they need without reading the whole document, while the annexes give quick reference lists for coding choices and channel names.

What are the key requirements of SIST ETS 300 575 E1:2003?

SIST ETS 300 575 E1:2003 builds each channel from a common coding chain: systematic block coding, convolutional coding, reordering, interleaving, and then burst mapping. Most channels use a 456-bit coded block, which is the common unit that later gets spread across bursts. That common structure matters because it lets designers reuse the same decoder architecture across several GSM channels.

General channel coding structure

Clause 2 says each channel has its own coding and interleaving scheme, but the organization is kept as uniform as possible. The document also introduces the naming convention for bits at each stage of processing, from input data bits to encoded, interleaved, and burst bits. In practice, that gives implementers a consistent way to label data while designing software, hardware, and test cases.

Some cases do not follow the common 456-bit structure. The random access channel (RACH) and the synchronization channel (SCH) use special burst formats, so they need separate handling in implementations and conformance tests.

Speech traffic channel TCH/FS

Clause 3.1 defines full rate speech traffic channel (TCH/FS) coding. The speech coder provides 260 information bits per speech frame, split into protected and unprotected classes. The protected part gets parity protection, then reordering, convolutional coding, interleaving over eight bursts, and burst mapping.

This matters because speech implementations must preserve the specified bit order from GSM 06.10 before channel coding, and they must handle the stealing flags used when traffic bits are replaced by FACCH signalling.

Data traffic channels

Clauses 3.3 to 3.7 define several data traffic channel variants, including TCH/F9.6, TCH/F4.8, TCH/H4.8, TCH/F2.4, and TCH/H2.4. These clauses specify the size of the input data blocks, whether blocks are coded alone or in pairs, what kind of convolutional code is used, and how the coded bits are interleaved and mapped onto bursts.

In practice, these clauses tell a system designer how to match the channel coding to a data service rate and how to align the coder with user-unit block sizes such as 60-bit or 36-bit frames. They also show where the same mapping method is reused across several channel types, which simplifies implementation and verification.

Control channels and burst stealing

Clause 4 covers SACCH, FACCH/F, FACCH/H, BCCH, PCH, AGCH, CBCH, SDCCH, RACH, SCH, and the Handover Access Burst. SACCH and the dedicated and broadcast control channels use a fixed 184-bit message structure with FIRE-code block coding followed by convolutional coding and interleaving.

FACCH/F and FACCH/H use the same coding as SACCH, but they are mapped by stealing bits from traffic bursts. The receiving side is informed by the hl(B) and hu(B) flags, so the equipment must set those flags correctly to show which bits were stolen. That matters because signalling can interrupt speech or data, and the network and terminal must know exactly which burst bits were replaced.

RACH and SCH use different message structures. RACH combines access information, parity, colour bits, and tail bits before convolutional coding, while SCH carries synchronization information with its own parity and tail-bit arrangement. The Handover Access Burst uses the same encoding as RACH, with the BSIC of the target base station.

What terms does SIST ETS 300 575 E1:2003 define?

SIST ETS 300 575 E1:2003 relies on GSM 01.04 for definitions and abbreviations, and it uses the following channel terms throughout the specification.

• TCH/FS - Full rate speech traffic channel, used for one speech frame per coded block.
• TCH/F9.6 - Full rate data traffic channel for 9.6 kbit/s services on a 12.0 kbit/s radio interface rate.
• TCH/F4.8 - Full rate data traffic channel for 4.8 kbit/s services on a 6.0 kbit/s radio interface rate.
• TCH/H4.8 - Half rate data traffic channel for 4.8 kbit/s services on a 6.0 kbit/s radio interface rate.
• SACCH - Slow associated control channel, used for control messages that share the radio path with traffic.
• FACCH/F - Fast associated control channel at full rate, used for urgent signalling by stealing traffic bits.
• FACCH/H - Fast associated control channel at half rate, using the same idea as FACCH/F but with half-rate mapping.
• RACH - Random access channel, used for uplink access bursts with a special burst format.
• SCH - Synchronization channel, used for downlink synchronization information on the BCCH.

Who uses SIST ETS 300 575 E1:2003?

SIST ETS 300 575 E1:2003 is used by GSM radio-interface engineers, base station and mobile station implementers, and developers of speech coders and data terminal equipment. It is also used by test labs, conformance teams, and quality managers who need to verify that channel coding, interleaving, burst mapping, and stealing flags follow the GSM Phase 2 specification.

For buyers and technical reviewers, the standard is relevant when checking whether a product supports GSM traffic and control-channel coding at the required speech and data channel types. It is especially useful where interoperability depends on exact bit ordering and burst-stealing behavior.

Which standards are used with SIST ETS 300 575 E1:2003?

SIST ETS 300 575 E1:2003 cites these normative references and companion specifications:

• GSM 01.04 - Provides the definitions, abbreviations, and acronyms used in the specification.
• GSM 04.08 - Supplies the mobile radio interface layer 3 specification and the bit ordering for SCH information.
• GSM 04.21 - Defines rate adaptation on the MS-BSS interface and the radio interface data flows used for the data channels.
• GSM 05.01 - Gives the reference configuration of the physical transmission chain used as the basis for this channel-coding specification.
• GSM 05.02 - Defines multiplexing and multiple access on the radio path and the logical channel types summarized in Annex A.
• GSM 06.10 - Defines full rate speech transcoding, which provides the speech bits fed into TCH/FS coding.

What does the SIST ETS 300 575 E1:2003 document contain?

SIST ETS 300 575 E1:2003 contains the channel-coding rules, bit naming conventions, interleaving patterns, and burst-mapping procedures for GSM Phase 2 channels. It includes the general coding chain in Figure 1, a detailed reordering and partitioning table for 8 subblocks, and the formulas used for parity generation and convolutional encoding.

The document also provides channel-specific procedures for speech, data, and control channels, including the special burst formats for RACH, SCH, and Handover Access Burst. Annex A gives a compact list of the channel types, and Annex B collects the convolutional-code polynomials used across the specification.

SLOVENSKI STANDARD
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±.RGLUDQMHNDQDORY
*60
European digital cellular telecommunications system (Phase 2); Channel coding (GSM
05.03)
Ta slovenski standard je istoveten z: ETS 300 575 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
35.040 Nabori znakov in kodiranje Character sets and
informacij information coding
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 575
TELECOMMUNICATION September 1994
STANDARD
Source: ETSI TC-SMG Reference: GSM 05.03
ICS: 33.060.30
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Channel coding
(GSM 05.03)
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 1994. All rights reserved.
New presentation - see History box

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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
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 300 575: September 1994 (GSM 05.03 version 4.1.3)
Contents
Foreword.5
1.1 Scope .7
1.2 Normative references .7
1.3 Definitions and abbreviations.7
2. General .8
2.1 General Organization.8
2.2 Naming Convention.8
3 Traffic Channels (TCH) .10
3.1 Speech channel at full rate (TCH/FS).10
3.1.1 Parity and tailing for a speech frame.10
3.1.2 Convolutional encoder.11
3.1.3 Interleaving.11
3.1.4 Mapping on a Burst .11
3.2 Speech channel at half rate (TCH/HS).12
3.3 Data channel at full rate, 12.0 kbit/s radio interface rate (9.6 kbit/s services
(TCH/F9.6)).12
3.3.1 Interface with user unit.12
3.3.2 Block code.12
3.3.3 Convolutional encoder.12
3.3.4 Interleaving.12
3.3.5 Mapping on a Burst .13
3.4 Data channel at full rate, 6.0 kbit/s radio interface rate (4.8 kbit/s services (TCH/F4.8)) . 13
3.4.1 Interface with user unit.13
3.4.2 Block code.13
3.4.3 Convolutional encoder.13
3.4.4 Interleaving.13
3.4.5 Mapping on a Burst .13
3.5 Data channel at half rate, 6.0 kbit/s radio interface rate (4.8 kbit/s services
(TCH/H4.8)).14
3.5.1 Interface with user unit.14
3.5.2 Block code.14
3.5.3 Convolutional encoder.14
3.5.4 Interleaving.14
3.5.5 Mapping on a Burst .14
3.6 Data channel at full rate, 3.6 kbit/s radio interface rate (2.4 kbit/s and less services
(TCH/F2.4)).14
3.6.1 Interface with user unit.14
3.6.2 Block code. 14
3.6.3 Convolutional encoder.14
3.6.4 Interleaving.15
3.6.5 Mapping on a Burst .15
3.7 Data channel at half rate, 3.6 kbit/s radio interface rate (2.4 kbit/s and less services
(TCH/H2.4)).15
3.7.1 Interface with user unit.15
3.7.2 Block code.15
3.7.3 Convolutional encoder.15
3.7.4 Interleaving.15
3.7.5 Mapping on a Burst .15

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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
4. Control Channels.15
4.1 Slow associated control channel (SACCH) .15
4.1.1 Block constitution.15
4.1.2 Block code.16
4.1.3 Convolutional encoder.16
4.1.4 Interleaving .16
4.1.5 Mapping on a Burst .16
4.2 Fast associated control channel at full rate (FACCH/F).17
4.2.1 Block constitution.17
4.2.2 Block code.17
4.2.3 Convolutional encoder.17
4.2.4 Interleaving .17
4.2.5 Mapping on a Burst .17
4.3 Fast associated control channel at half rate (FACCH/H) .17
4.3.1 Block constitution.17
4.3.2 Block code.17
4.3.3 Convolutional encoder.18
4.3.4 Interleaving .18
4.3.5 Mapping on a Burst .18
4.4 Broadcast, Paging, Access grant and Cell broadcast channels (BCCH, PCH, AGCH,
CBCH).19
4.5 Stand-alone dedicated control channel (SDCCH) .19
4.6 Random access channel (RACH).19
4.7 Synchronization channel (SCH) .20
4.8 Handover Access Burst.20
Annex A (informative): Summary of Channel Types .23
Annex B (informative): Summary of Polynomials Used for Convolutional Codes .24
History .25

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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
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 specifies the channel coding of used within the European digital cellular telecommunications
system (Phase 2).
This ETS correspond to GSM technical specification, GSM 05.03 version 4.1.3.
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.

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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
1.1 Scope
A reference configuration of the transmission chain is shown in GSM 05.01. According to this reference
configuration, this technical specification specifies the data blocks given to the encryption unit.
It includes the specification of encoding, reordering, interleaving and the stealing flag. It does not specify
the channel decoding method.
The definition is given for each kind of logical channel, starting from the data provided to the channel
encoder by the speech coder, the data terminal equipment, or the controller of the MS or BS. The
definitions of the logical channel types used in this technical specification are given in GSM 05.02, a
summary is in Annex A.
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); Definitions, abbreviations and acronyms".
[2] GSM 04.08 (ETS 300 557): "European digital cellular telecommunication system
(Phase 2); Mobile radio interface layer 3 specification".
[3] GSM 04.21 (ETS 300 562): "European digital cellular telecommunication system
(Phase 2); Rate adaption on the Mobile Station - Base Station System (MS -
BSS) interface".
[4] GSM 05.01 (ETS 300 573): "European digital cellular telecommunication system
(Phase 2); Physical layer on the radio path General description".
[5] GSM 05.02 (ETS 300 574): "European digital cellular telecommunication system
(Phase 2); Multiplexing and multiple access on the radio path".
[6] GSM 06.10 (ETS 300 580-2): "European digital cellular telecommunication
system (Phase 2); Full rate speech transcoding".
1.3 Definitions and abbreviations
Definitions and abbreviations used in this specification are listed in GSM 01.04.

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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
2. General
2.1 General Organization
Each channel has its own coding and interleaving scheme. However, the channel coding and interleaving is
organized in such a way as to allow, as much as possible, a unified decoder structure.
Each channel uses the following sequence and order of operations:
- The information bits are coded with a systematic block code, building words of information +
parity bits.
- These information + parity bits are encoded with a convolutional code, building the coded bits.
- Reordering and interleaving the coded bits, and adding a stealing flag, gives the interleaved
bits.
All these operations are made block by block, the size of which depends on the channel. However, most of
the channels use a block of 456 coded bits which is interleaved and mapped onto bursts in a very similar
way for all of them. Figure 1 gives a diagram showing the general structure of the channel coding.
This block of 456 coded bits is the basic structure of the channel coding scheme. In the case of speech
TCH, this block carries the information of one speech frame. In case of control channels, it carries one
message.
In the case of Fast ACCH, a coded message block of 456 bits is divided in to eight sub-blocks. The first
four sub-blocks are sent by stealing the even numbered bits of four timeslots in consecutive frames used
for the TCH. The other four sub-blocks are sent by stealing the odd numbered bits of the relevant timeslot
in four consecutive used frames delayed 2 or 4 frames relative to the first frame. Along with each block of
456 coded bits there is, in addition, a stealing flag (8 bits), indicating whether the block belongs to the TCH
or to the fast ACCH. In the case of slow ACCH, BCCH or CCCH, this stealing flag is dummy.
Some cases do not fit in the general organization, and do not use the block of 456 coded bits. They are
the random access messages of the RACH on uplink and the synchronization information broadcast on the
SCH.
2.2 Naming Convention
For ease of understanding a naming convention for bits is given for use throughout the technical
specification:
- General naming
"k" and "j" for numbering of bits in data blocks and bursts.
"K " gives the amount of bits in one block, where "x" refers to the data type
x
"n" is used for numbering of delivered data blocks where
"N" marks a certain data block
"B" is used for numbering of bursts or blocks where
"B " marks the first burst or block carrying bits from the data block with n = 0 (first data block in the
transmission)
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ETS 300 575: September 1994 (GSM 05.03 version 4.1.3)
- Data delivered to the encoding unit (interface 1 in figure 1):
d (n, k) or d (k) for k = 0,1,.,K -1
d
n = 0,1,.,N,N+1,.
- Data after the first encoding step (block code, cyclic code; interface 2 in figure 1):
u(n,k) or u (k) for k = 0,1,.,K -1
u
n = 0,1,.,N,N+1,.
- Data after the second encoding step (convolutional code ; interface 3 in figure 1):
c(n,k) or c(k) for k = 0,1,.,K -1
c
n = 0,1,.,N,N+1,.
- Interleaved data:
i(B,k) for k = 0,1,.,K -1
i
B = B , B +1,.
0 0
- Bits in one burst (interface 4 in figure 1):
e(B,k)for k = 0,1,.,114,115
B = B , B + 1,.
0 0
3 Traffic Channels (TCH)
Two kinds of traffic channel are considered: speech and data. Both of them use the same general
structure (see fig.1), and in both cases, a piece of information can be stolen by the fast ACCH.
3.1 Speech channel at full rate (TCH/FS)
The speech coder delivers to the channel encoder a sequence of blocks of data. In case of a full rate
speech TCH, one block of data corresponds to one speech frame. Each block contains 260 information
bits,including 182 bits of class 1 (protected bits), and 78 bits of class 2 (no protection), (see Table 2).
The bits delivered by the speech coder are received in the order indicated in GSM 06.10 and have to be
rearranged according to Table 2 before channel coding as defined in 3.1.1 to 3.1.4. The rearranged bits
are labelled {d(0), d(1),., d(259)}, defined in the order of decreasing importance.
3.1.1 Parity and tailing for a speech frame
a) Parity bits:
The first 50 bits of class 1 are protected by three parity bits used for error detection. These parity
bits are added to the 50 bits, according to a degenerate (shortened) cyclic code (53,50,2), using the
generator polynomial:
g(D) = D + D + 1
The encoding of the cyclic code is performed in a systematic form, which means that, in GF(2), the
polynomial:
52 51 3 2
d(0)D + d(1)D +. + d(49)D + p(0)D + p(1)D+ p(2)
where p(0), p(1), p(2) are the parity bits, when divided by g(D), yields a remainder equal to
1 + D + D
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b) Tailing bits and reordering:
The information and parity bits of class 1 are reordered, defining 189 information + parity + tail bits
of class 1, {u(0), u(1),., u(188)} defined by:
u(k) = d(2k) and u(184-k) = d(2k+1) for k = 0,1,.,90
u(91+k) = p(k) for k = 0,1,2
u(k) = 0 (tail bits) for k = 185, 186, 187, 188
3.1.2 Convolutional encoder
The class 1 bits are encoded with the 1/2 rate convolutional code defined by the polynomials:
3 4
G0 = 1 + D + D
3 4
G1 = 1 + D + D + D
The coded bits {c(0), c(1),., c(455)} are then defined by:
- class 1 : c(2k) = u(k) + u(k-3) + u(k-4)
c(2k+1) = u(k) + u(k-1) + u(k-3) + u(k-4) for k = 0,1,.,188
u(k) = 0, k < 0
- class 2 : c(378+k) = d(182+k) for k = 0,1,.,77
3.1.3 Interleaving
The coded bits are reordered and interleaved according to the following rule :
i(B,j) = c(n,k), for k = 0,1,.,455
n = 0,1,.,N,N+1,.
B = B + 4n + k mod (8)
j = 2[(49k) mod 57] + [(k mod 8) div 4]
The result of the interleaving is a distribution of the reordered 456 bits of a given data block, n = N, over 8
blocks using the even numbered bits of the first 4 blocks (B = B + 4N + 0, 1, 2, 3) and odd numbered bits
of the last 4 blocks (B = B + 4 N + 4, 5, 6, 7). The reordered bits of the following data block, n = N+1,
use the even numbered bits of the blocks B = B + 4N + 4, 5, 6, 7 (B = B + 4(N+1) + 0, 1, 2, 3) and the
0 0
odd numbered bits of the blocks B= B + 4(N+1) + 4, 5, 6, 7. Continuing with the next data blocks shows
that one block always carries 57 bits of data from one data block (n = N) and 57 bits of data from the next
block (n = N+1), where the bits from the data block with the higher number always are the even numbered
data bits, and those of the data block with the lower number are the odd numbered bits.
The block of coded data is interleaved "block diagonal", where a new data block starts every 4th block and
is distributed over 8 blocks.
3.1.4 Mapping on a Burst
The mapping is given by the rule :
e(B,j) = i(B,j) and e(B, 59+j) = i(B,57 + j) for j = 0,. 56
and
e(B,57) = hl(B) and e(B,58) = hu(B)
The two bits, labelled hl(B) and hu(B) on burst number B are flags used for indication of control channel
signalling. For each TCH/FS block not stolen for signalling purposes:
hu(B) = 0 for the first 4 burst (indicating status of even numbered bits)
hl(B) = 0 for the last 4 bursts (indicating status of odd numbered bits)
For the use of hl(B) and hu(B) when a speech frame is stolen for signalling purposes see section 4.2.5.

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3.2 Speech channel at half rate (TCH/HS)
To be defined for a future evolution of the system.
3.3 Data cha
...