SIST ETS 300 575/A1 E2:2003

SIST ETS 300 575/A1 E2:2003 is the Slovene adoption of ETS 300 575/A1 Edition 2, an ETSI amendment to GSM 05.03, European digital cellular telecommunications system (Phase 2); Channel coding. It specifies how data blocks are encoded, reordered, interleaved and marked by the stealing flag before they are passed to the encryption unit in the GSM transmission chain. The document is for people implementing or checking GSM channel coding for logical channels in the MS or BS.

What does SIST ETS 300 575/A1 E2:2003 specify?

SIST ETS 300 575/A1 E2:2003 specifies channel coding in the reference transmission chain shown in GSM 05.01. In practice, that means it tells implementers how the coded data is prepared for transmission, but it leaves channel decoding outside its scope.

The specification starts from the data provided to the channel encoder by the speech coder, the data terminal equipment, or the controller of the MS or BS. It then sets out how that data is encoded, reordered, interleaved and handled with the stealing flag.

Logical channel definitions are taken from GSM 05.02, with a summary in Annex 1.

What are the key requirements of SIST ETS 300 575/A1 E2:2003?

The key technical point in SIST ETS 300 575/A1 E2:2003 is the revised Table 3b in subclause 4.8. That table assigns the subjective importance of encoded bits for the half rate speech TCH for voiced speech frames, so implementers know which bits need stronger protection in the coding chain.

The document uses the transmission chain reference configuration from GSM 05.01. In practice, this fixes the path of the data blocks before encryption and makes the coding process consistent across implementations.

Channel coding functions

SIST ETS 300 575/A1 E2:2003 covers four processing functions - encoding, reordering, interleaving and the stealing flag. These are the core steps that shape the bit stream before transmission, so they affect speech and data behavior directly.

Bit importance for voiced speech frames

SIST ETS 300 575/A1 E2:2003 replaces Table 3b in subclause 4.8. The table classifies parameter bits for voiced speech frames, with parameter names and bit indices referring to GSM 06.20. It distinguishes classes for bits with parity check and without parity check, which is important when mapping speech codec output into the radio channel.

Scope boundary

SIST ETS 300 575/A1 E2:2003 does not specify the channel decoding method. For implementers, that means this document is used on the transmit-side channel coding path, while the receive-side decoding rules must be taken from elsewhere.

Amendment markings

SIST ETS 300 575/A1 E2:2003 marks the changed entries in Table 3b with double underline and revision bars. That helps readers find the updated bit-priority assignments quickly when comparing versions.

What terms does SIST ETS 300 575/A1 E2:2003 define?

• Logical channel - a channel type used in this specification, with the definitions taken from GSM 05.02 and summarized in Annex 1.
• Channel encoder - the part of the transmission chain that receives data from the speech coder, data terminal equipment, or the controller of the MS or BS.
• Stealing flag - the flag included in the coding specification for the data blocks given to the encryption unit.
• Half rate speech TCH - the speech channel addressed by Table 3b when it assigns subjective importance to encoded bits.
• Subjective importance - the bit-priority classification used in Table 3b to rank encoded bits for voiced speech frames.
• Parity check - the distinction used in Table 3b between bits that are protected by parity and bits that are not.

Who uses SIST ETS 300 575/A1 E2:2003?

SIST ETS 300 575/A1 E2:2003 is used by GSM radio and terminal engineers, speech codec implementers, and equipment suppliers working on the MS or BS side of the transmission chain. It is also relevant to test and quality teams that check whether bit handling, interleaving and bit-priority mapping match the GSM 05.03 requirements.

Buyers and technical reviewers use it to confirm that a product or subsystem is aligned with the GSM Phase 2 channel coding rules, especially for voiced speech on half rate speech TCH.

What changed in SIST ETS 300 575/A1 E2:2003 from the previous edition?

SIST ETS 300 575/A1 E2:2003 is an amendment to ETS 300 575 second edition (July 1995). The amendment corresponds to changes to GSM-TS 05.03 from version 4.2.0 to version 4.3.0.

The stated change is the replacement of subclause 4.8, Table 3b. The updated table concerns the subjective importance of encoded bits for the half rate speech TCH for voiced speech frames, and the changes are marked with double underline and revision bars.

Which standards are used with SIST ETS 300 575/A1 E2:2003?

• GSM 05.01 - provides the reference configuration of the transmission chain used by this specification.
• GSM 05.02 - provides the definitions of the logical channel types used here; Annex 1 gives a summary.
• GSM 06.20 - provides the parameter names and bit indices referenced in Table 3b.

What does the SIST ETS 300 575/A1 E2:2003 document contain?

SIST ETS 300 575/A1 E2:2003 is an amendment document, so its technical content is concentrated in a replaced table rather than a full rewrite of the standard. The main technical item is Table 3b in subclause 4.8, which sets out the subjective importance of encoded bits for voiced speech frames on half rate speech TCH.

The document also includes the foreword, transposition dates, and a history section that records the edition and amendment trail. The history notes the move from the second edition to Amendment 1 and the later PDF conversion.