SIST ETS 300 574 E7:2003

• Abstract:

  Non strategic CRs A015 to GSM 05.02 v.4.8.0,

• 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.7 (1999-08) - Digital cellular telecommunications system (Phase 2) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 4.10.1)

SIST ETS 300 574 E7:2003 is the SIST version of ETSI ETS 300 574 Edition 7 for GSM Phase 2. It specifies the physical channels on the GSM radio path, including how frequency hopping, TDMA frames, timeslots, bursts, and logical-to-physical channel mapping are organized for GSM radio subsystem design and operation.

What does SIST ETS 300 574 E7:2003 specify?

SIST ETS 300 574 E7:2003 defines the physical channels of the radio subsystem needed to support GSM logical channels. The document is organized into clauses on logical channels, the physical resource, physical channels, and the mapping of logical channels onto physical channels, with Annex A for a special operating case and Annex B for change history.

Annex	What it covers
A (normative)	Phase 2 mobiles in a Phase 1 infrastructure, including TCH filling options, half-burst filling, and allowed combinations for downlink DTX with frequency hopping
B (informative)	Change control history

What are the key requirements of SIST ETS 300 574 E7:2003?

Logical and control channels

Clause 3 defines the main channel families used on the air interface. Traffic channels (TCH) carry speech or user data, while control channels carry signalling and synchronization information.

In practice, this is the basis for deciding which radio resources are available for calls, paging, access, broadcast information, and dedicated signalling. Clause 3 also identifies specific channel types such as FCCH, SCH, BCCH, PCH, RACH, AGCH, SDCCH, SACCH, FACCH and CBCH, so implementers can assign the right channel to the right function.

Physical resource, timeslots, frames, and bursts

Clause 4 describes the radio resource as a split of frequency and time. It defines cell allocation (CA), mobile allocation (MA), the BCCH carrier, downlink and uplink directions, timeslot numbering, TDMA frame numbering, and the hyperframe structure.

This matters because a GSM radio design must place each transmission in the right frequency channel and the right time position. Clause 5 then defines the burst types used in those timeslots - normal burst (NB), frequency correction burst (FB), synchronization burst (SB), dummy burst, and access burst (AB) - together with the guard period.

For implementation, that means the transmitter must generate the correct burst format, training sequence, and timing margin for each channel type. The document also notes when dummy bursts are used, including on unused C0 timeslots.

Mapping logical channels onto physical channels

Clause 6 is the core of the document. It defines how logical channels are mapped in frequency and in time onto physical channels, and it identifies the parameters needed for that mapping: CA, FN, MA, MAIO, HSN, TSC, TN, type of logical channel, and sub-channel number.

The frequency hopping part is especially important. Clause 6.2.3 gives the hopping sequence generation method, using HSN, MAIO, MA and the frame parameters. In practice, this is what a BTS and mobile use to decide which RF channel to use in each frame.

Clause 6.2.4 states that the BCCH carrier does not hop on the timeslots that support BCCH. Clause 6.2.5 explains that changing the frequency allocation of a BTS requires updated cell and mobile allocation information to be signalled so active mobiles can move without disruption.

Control-channel organization and paging

Clause 6.5 uses BCCH parameters to organize common control access. CCCH_CONF determines how many common control channels exist and whether CCCH and SDCCH are combined. BS_AG_BLKS_RES reserves blocks for access grants, and BS_PA_MFRMS sets the paging repetition interval.

This is practical network-planning information. It determines how paging is distributed, how often mobiles listen, and how much capacity is left for access grants and system information. Clause 6.5.2 and 6.5.3 define how CCCH_GROUP and PAGING_GROUP are derived from IMSI and how the correct paging block is selected.

SMSCB handling

Clause 6.5.4 specifies how short message service cell broadcast (SMSCB) is sent on the CBCH. The message is carried over four consecutive multiframes, with the header in the first one.

For operators, this means SMS cell broadcast has a fixed transmission pattern that must be scheduled consistently with BCCH and paging traffic.

Annex A special case

Annex A defines how Phase 2 mobiles behave in a Phase 1 infrastructure when downlink DTX is used with frequency hopping. It gives allowed C0 filling options, half-burst filling options, stealing-flag handling, and the allowed combinations for that environment.

What terms does SIST ETS 300 574 E7:2003 define?

• Traffic channel (TCH) - The channel family used to carry encoded speech or user data.
• Broadcast control channel (BCCH) - The downlink channel that broadcasts general cell information.
• Common control channel (CCCH) - The channel family used for paging, random access and access grants.
• Base transceiver station (BTS) - The network radio unit that transmits and receives the GSM air interface channels.
• Cell allocation (CA) - The set of RF channels assigned to a cell.
• Mobile allocation index offset (MAIO) - The offset used with MA and HSN to select the hopping position.
• Frame number (FN) - The cyclic TDMA frame counter used in scheduling and hopping.
• Short Message Service Cell Broadcast (SMSCB) - Broadcast short message service carried on the CBCH.

Who uses SIST ETS 300 574 E7:2003?

This standard is used by GSM radio access engineers, BTS and mobile station implementers, chipset vendors, and network planners. It is also used by test laboratories and interoperability teams that verify burst timing, hopping behavior, paging structure, and channel combinations. Buyers and quality managers use it to check whether a product or network feature follows the GSM radio-channel structure they need.

What changed in SIST ETS 300 574 E7:2003 from the previous edition?

The change control history records a technical correction: removal of an inconsistency in Table 7.

Which standards are used with SIST ETS 300 574 E7:2003?

• GSM 01.04 - Provides the abbreviations and acronyms used in the document.
• GSM 03.03 - Provides numbering, addressing and identification terms such as BSIC and IMSI.
• GSM 04.03 - Defines MS-BSS channel structures, access capabilities, and permitted channel combinations.
• GSM 04.06 - Supports the data link layer aspects of the radio interface.
• GSM 04.08 - Provides layer 3 signalling and the BCCH-related parameters used for paging and system information.
• GSM 05.03 - Provides channel coding referenced for burst payloads and training-related fields.
• GSM 05.04 - Provides modulation details linked to burst characteristics.
• GSM 05.05 - Provides radio transmission and reception rules, including timing and ramping behavior.
• GSM 05.08 - Provides radio subsystem link control, including DTX and SID-related behavior.
• GSM 05.10 - Provides radio subsystem synchronization and the frame-number calculations used here.

What does the SIST ETS 300 574 E7:2003 document contain?

The document contains mapping tables for traffic and control channels, including the allowed combinations of logical channels on basic physical channels. It also contains the frequency-hopping generation method, paging-group derivation, and the timing relationships between TDMA frames and multiframes. The figures show the channel-mapping concept, frame structure, burst formats, hopping operation, and example TDMA mappings for traffic and control channels. Annex A adds implementation options for Phase 2 mobiles in a Phase 1 infrastructure, including dummy-burst and half-burst filling cases.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 4.10.1)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:ETS 300 574 Edition 7SIST ETS 300 574 E7:2003en01-december-2003SIST ETS 300 574 E7:2003SLOVENSKI
STANDARD
EUROPEANETS 300 574TELECOMMUNICATIONAugust 1999STANDARDSeventh EditionSource: SMGReference: RE/SMG-020502PR6ICS:33.020Key words:Digital cellular telecommunications system, Global System for Mobile communications (GSM)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRDigital cellular telecommunications system (Phase 2);Multiplexing and multiple access on the radio path(GSM 05.02 version 4.10.1)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEInternet: [e-mail] - http://www.etsi.orgTel.: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999. All rights reserved.SIST ETS 300 574 E7:2003

Page 2ETS 300 574 (GSM 05.02 version 4.10.1): August 1999Whilst 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 Standards Making Support Dept." at the address shown on the title page.SIST ETS 300 574 E7:2003

Page 3ETS 300 574 (GSM 05.02 version 4.10.1): August 1999ContentsIntellectual Property Rights.5Foreword.51Scope.71.1Normative references.71.2Abbreviations.72General.73Logical channels.83.1General.83.2Traffic channels.83.2.1General.83.2.2Speech traffic channels.83.2.3Data traffic channels.83.3Control channels.83.3.1General.83.3.2Broadcast channels.83.3.2.1Frequency correction channel (FCCH).83.3.2.2Synchronization channel (SCH).83.3.2.3Broadcast control channel (BCCH).93.3.3Common control type channels, known when combined as a commoncontrol channel (CCCH).93.3.4Dedicated control channels.93.3.5Cell Broadcast Channel (CBCH).103.4Combination of channels.104The physical resource.104.1General.104.2Radio frequency channels.104.2.1Cell allocation and mobile allocation.104.2.2Downlink and uplink.104.3Timeslots and TDMA frames.104.3.1General.104.3.2Timeslot number.114.3.3TDMA frame number.115Physical channels.115.1General.115.2Bursts.115.2.1General.115.2.2Types of burst and burst timing.115.2.3Normal burst (NB).125.2.4Frequency correction burst (FB).125.2.5Synchronization burst (SB).135.2.6Dummy burst.135.2.7Access burst (AB).135.2.8Guard period.145.3Physical channels and bursts.145.4Radio frequency channel sequence.145.5Timeslot and TDMA frame sequence.145.6Parameters for channel definition and assignment.145.6.1General.145.6.2General parameters.145.6.3Specific parameters.15SIST ETS 300 574 E7:2003

Page 4ETS 300 574 (GSM 05.02 version 4.10.1): August 19996Mapping of logical channels onto physical channels.156.1General.156.2Mapping in frequency of logical channels onto physical channels.156.2.1General.156.2.2Parameters.156.2.3Hopping sequence generation.156.2.4Specific cases.166.2.5Change in the frequency allocation of a base transceiver station.176.3Mapping in time of logical channels onto physical channels.176.3.1General.176.3.2Key to the mapping table of section 7.176.3.3Mapping of TCH/F9.6, TCH/F4.8, TCH/H4.8 and TCH/H2.4.176.3.4Mapping of BCCH data.186.3.5Mapping of SID Frames.186.4Permitted channel combinations.186.5Operation of channels and channel combinations.196.5.1General.196.5.2Determination of CCCH_GROUP and PAGING_GROUP.206.5.3Determination of specific paging multiframe and paging block index.206.5.4Short Message Service Cell Broadcast (SMSCB).20Annex A (normative):Phase 2 mobiles in a phase 1 infrastructure.34A.1Scope.34A.2Implementation options for TCH channels.34A.2.1C0 filling on the TCH.34A.2.2Half burst filling.34A.2.3Dummy burst Stealing flag.34A.2.4Half burst Filling Stealing flag.35A.2.5Allowed combinations.35A.3Idle Channels.35Annex B (informative):Change control history.36History.37SIST ETS 300 574 E7:2003

Page 5ETS 300 574 (GSM 05.02 version 4.10.1): August 1999Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. Theinformation pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentiallyEssential, IPRs notified to ETSI in respect of ETSI standards", which is available free of charge from theETSI Secretariat. Latest updates are available on the ETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.No guarantee can be given as to the existence of other IPRs not referenced in SR 000 314 (or theupdates on the ETSI Web server) which are, or may be, or may become, essential to the presentdocument.ForewordThis European Telecommunication Standard (ETS) has been produced by the Special Mobile Group(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).This ETS defines the physical channels of the radio sub-system required to support the logical channelsused within the Digital cellular telecommunications system (Phase 2).The contents of this ETS are subject to continuing work within SMG and may change following formalSMG approval. Should SMG modify the contents of this ETS it will then be re-submitted for approval byETSI with an identifying change of release date and an increase in version number as follows:Version 4.x.ywhere:4indicates GSM Phase 2xthe second digit is incremented for all changes of substance, i.e. technical enhancements,corrections, updates, etc.ythe third digit is incremented when editorial only changes have been incorporated in thespecification.Transposition datesDate of adoption of this ETS:6 August 1999Date of latest announcement of this ETS (doa):30 November 1999Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 May 2000Date of withdrawal of any conflicting National Standard (dow):31 May 2000SIST ETS 300 574 E7:2003

Page 6ETS 300 574 (GSM 05.02 version 4.10.1): August 1999Blank pageSIST ETS 300 574 E7:2003

Page 7ETS 300 574 (GSM 05.02 version 4.10.1): August 19991ScopeThis European Telecommunication Standard (ETS) defines the physical channels of the radio sub-systemrequired to support the logical channels. It includes a description of the logical channels and the definitionof frequency hopping, TDMA frames, timeslots and bursts.1.1Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]GSM 01.04 (ETR 100): "Digital cellular telecommunications system (Phase 2);Abbreviations and acronyms".[2]GSM 03.03 (ETS 300 523): "Digital cellular telecommunications system(Phase 2); Numbering, addressing and identification".[3]GSM 04.03 (ETS 300 552): "Digital cellular telecommunications system(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Channelstructures and access capabilities".[4]GSM 04.06 (ETS 300 555): "Digital cellular telecommunications system(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Data Link(DL) layer specification".[5]GSM 04.08 (ETS 300 557): "Digital cellular telecommunications system(Phase 2); Mobile radio interface layer 3 specification".[6]GSM 05.03 (ETS 300 575): "Digital cellular telecommunications system(Phase 2); Channel coding".[7]GSM 05.04 (ETS 300 576): "Digital cellular telecommunications system(Phase 2); Modulation".[8]GSM 05.05 (ETS 300 577): "Digital cellular telecommunications system(Phase 2); Radio transmission and reception".[9]GSM 05.08 (ETS 300 578): "Digital cellular telecommunications system(Phase 2); Radio subsystem link control".[10]GSM 05.10 (ETS 300 579): "Digital cellular telecommunications system(Phase 2); Radio subsystem synchronization".1.2AbbreviationsDefinitions and abbreviations used in this ETS are listed in GSM 01.04 [1].2GeneralThe radio subsystem is required to support a certain number of logical channels that can be separatedinto two overall categories as defined in GSM 04.03:i)The traffic channels (TCH's).ii)The control channels.More information is given about these logical channels in section 3 which also defines a number of specialchannels used by the radio sub-system.SIST ETS 300 574 E7:2003

Page 8ETS 300 574 (GSM 05.02 version 4.10.1): August 1999Section 4 of this document describes the physical resource available to the radio sub-system, section 5defines physical channels based on that resource and section 6 specifies how the logical channels shallbe mapped onto physical channels. Figure 1 depicts this process.3Logical channels3.1GeneralThis section describes the logical channels that are supported by the radio subsystem.3.2Traffic channels3.2.1GeneralTraffic channels (TCH's) are intended to carry either encoded speech or user data. Two general forms oftraffic channel are defined:i)Full rate traffic channel (TCH/F). This channel carries information at a gross rate of22.8 kbits/s.ii)Half rate traffic channel (TCH/H). This channel carries information at a gross rate of11.4 kbit/s.The specific traffic channels available in the categories of speech and user data are defined in thesections following.3.2.2Speech traffic channelsThe 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).3.2.3Data traffic channelsThe 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).3.3Control channels3.3.1GeneralControl channels are intended to carry signalling or synchronization data. Three categories of controlchannel are defined: broadcast, common and dedicated. Specific channels within these categories aredefined in the sections following.3.3.2Broadcast channels3.3.2.1Frequency correction channel (FCCH)The frequency correction channel carries information for frequency correction of the mobile station. It isrequired only for the operation of the radio sub-system.3.3.2.2Synchronization channel (SCH)The synchronization channel carries information for frame synchronization of the mobile station andidentification 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:SIST ETS 300 574 E7:2003

Page 9ETS 300 574 (GSM 05.02 version 4.10.1): August 1999a)Base transceiver station identity code (BSIC): 6 bits (before channel coding) consists of 3 bitsof PLMN colour code with range 0 to 7 and 3 bits of BS colour code with range 0 to 7 asdefined 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 26T3'(3 bits)range 0 to 4= (T3 - 1) div 10whereT3(6 bits)range 0 to 50= FN mod 51andFN = 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 aboveparameters and GSM 05.10 defines how the TDMA frame number can be calculated from T1, T2, andT3'.3.3.2.3Broadcast control channel (BCCH)The broadcast control channel broadcasts general information on a base transceiver station per basetransceiver station basis. Of the many parameters contained in the BCCH, the use of the followingparameters, 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) andwhether or not CCCH or SDCCH are combined (BS_CCCH_SDCCH_COMB = true or false)are derived as follows:CCCH_CONFBS_CC_CHANSBS_CCCH_SDCCH_COMB0001false0011true0102false1003false1104falseb)BS_AG_BLKS_RES which indicates the number of blocks on each common control channelreserved for access grant messages:3 bits (before channel coding) range 0 to 7.c)BS_PA_MFRMS which indicates the number of 51 TDMA frame multiframes betweentransmission of paging messages to mobiles of the same paging group:3 bits (before channel coding) range 2 to 9.3.3.3Common 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.3.3.4Dedicated control channelsi)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).SIST ETS 300 574 E7:2003

Page 10ETS 300 574 (GSM 05.02 version 4.10.1): August 1999v)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).3.3.5Cell Broadcast Channel (CBCH)The CBCH, downlink only, is used to carry the short message service cell broadcast (SMSCB). TheCBCH uses the same physical channel as the SDCCH.3.4Combination of channelsOnly certain combinations of channels are allowed as defined in GSM 04.03. Section 6.4 lists thecombinations in relation to basic physical channels.4The physical resource4.1GeneralThe physical resource available to the radio sub-system is an allocation of part of the radio spectrum. Thisresource 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 framesas defined in section 4.3 of this ETS.4.2Radio frequency channels4.2.1Cell allocation and mobile allocationGSM 05.05 defines radio frequency channels (RFCHs), and allocates numbers to all the radio frequencychannels available to the system. Each cell is allocated a subset of these channels, defined as the cellallocation (CA). One radio frequency channel of the cell allocation shall be used to carry synchronizationinformation 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).4.2.2Downlink and uplinkThe downlink comprises radio frequency channels used in the base transceiver station to mobile stationdirection.The uplink comprises radio frequency channels used in the mobile station to base transceiver stationdirection.4.3Timeslots and TDMA frames4.3.1GeneralA 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 downlinkshall 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 of3 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. Theprocess 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 timeslotnumber to be used in the downlink and uplink whilst avoiding the requirement for the mobile station totransmit and receive simultaneously. The period includes time for adaptive frame alignment, transceivertuning and receive/transmit switching (see figure 4).SIST ETS 300 574 E7:2003

Page 11ETS 300 574 (GSM 05.02 version 4.10.1): August 19994.3.2Timeslot numberThe timeslots within a TDMA frame shall be numbered from 0 to 7 and a particular timeslot shall bereferred to by its timeslot number (TN).4.3.3TDMA frame numberTDMA frames shall be numbered by a frame number (FN). The frame number shall be cyclic and shallhave 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. Ahyperframe consists of 2048 superframes where a superframe is defined as 26 x 51 TDMA frames. A26 TDMA frame multiframe is used to support traffic and associated control channels and a 51 TDMAframe multiframe is used to support broadcast, common control and stand alone dedicated control (andtheir associated control) channels. Hence a superframe may be considered as 51 traffic/associatedcontrol multiframes or 26 broadcast/common control multiframes.The need for a hyperframe of a substantially longer period than a superframe arises from therequirements of the encryption process which uses FN as an input parameter.5Physical channels5.1GeneralA physical channel uses a combination of frequency and time division multiplexing and is defined as asequence of radio frequency channels and time slots. The complete definition of a particular physicalchannel 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 isaddressed in section 5.5.5.2Bursts5.2.1GeneralA burst is a period of R.F. carrier which is modulated by a data stream. A burst therefore represents thephysical content of a timeslot.5.2.2Types of burst and burst timingA timeslot is divided into 156.25 bit periods. A particular bit period within a timeslot is referenced by a bitnumber (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 bitnumber. 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. Thisdocument, in the sections following, defines four full bursts of 147 bits useful duration, and one short burstof 87 bits useful duration. The useful part of a burst is defined as beginning from half way through bitnumber 0. The definition of the useful part of a burst needs to be considered in conjunction with therequirements placed on the phase and amplitude characteristics of a burst as specified in GSM 05.04 and05.05.The period between bursts appearing in successive timeslots is termed the guard period. Section 5.2.8details constraints which relate to the guard period.SIST ETS 300 574 E7:2003

Page 12ETS 300 574 (GSM 05.02 version 4.10.1): August 19995.2.3Normal burst (NB)Bit NumberLengthContentsDefinition(BN)of fieldof field0
-
23tail bits(below)3
-
6058encrypted bits (e0 . e57)05.0361
-
8626training sequence bits(below)87
-
14458encrypted bits (e58 . e115)05.03145
-
1473tail bits(below)(148
-
1568,25guard 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 thefollowing table according to the training sequence code, TSC. For broadcast and common controlchannels, the TSC must be equal to the BCC, as defined in GSM 03.03 and as described in thistechnical specification in section 3.3.2.TrainingTraining sequence bitsSequence(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 only half the encrypted bits present in a normal burst will contain completeinformation. For downlink DTX operation on TCH-FS and TCH-HS, when a traffic frame (as defined inGSM 06.31) is scheduled for transmission and one of its adjacent traffic frames is not scheduled fortransmission, the other half of the encrypted bits in the normal bursts associated with the scheduled trafficframe shall contain partial SID information from any associated SID frame, with the appropriate stealingflags BN60 or BN87 set to 0. In other cases the binary state of the remaining bits is not specified.5.2.4Frequency correction burst (FB)Bit NumberlengthContentsDefinition(BN)of fieldof field0
-
23tail bits(below)3
-
144142fixed bits(below)145
-
1473tail bits(below)(148
-
1568,25guard 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 +1 625/24 kHz frequency offset,above the nominal carrier frequency.SIST ETS 300 574 E7:2003

Page 13ETS 300 574 (GSM 05.02 version 4.10.1): August 19995.2.5Synchronization burst (SB)Bit NumberLengthContentsDefinition(BN)of fieldof field0
-
23tail bits(below)3
-
4139encrypted bits (e0 . e38)05.0342
-
10564extended training sequence bits(below)106
-
14439encrypted bits (e39 . e77)05.03145
-
1473tail bits(below)(148
-
1568,25guard 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)5.2.6Dummy burstBit NumberLengthContentsDefinition(BN)of fieldof field0
-
23tail bits(below)3
-
144142mixed bits(below)145
-
1473tail bits(below)(148
-
1568,25guard 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 "mixed bits" are defined as modulating bits with states as follows:(BN3, BN4 . BN144)=(1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0)5.2.7Access burst (AB)Bit NumberLengthContentsDefinition(BN)of fieldof field0
-
78extended tail bits(below)8
-
4841synch. sequence bits(below)49
-
8436encrypted bits (e0.e35)05.0385
-
873tail bits(below)(88
-
15668,25extended guard period (bits)section 5.2.8)-where the "extended tail bits" are defined as modulating bits with the following states:(BN0, BN1, BN2 . BN7)= (0, 0, 1, 1, 1, 0, 1, 0)-where the "tail bits" are defined as modulating bits with the following states:(BN85, BN86, BN87)
= (0, 0, 0)SIST ETS 300 574 E7:2003

Page 14ETS 300 574 (GSM 05.02 version 4.10.1): August 1999-where the "sync. sequence bits" are defined as modulating bits with the following states:(BN8, BN9 . BN48)= (0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0)5.2.8Guard periodThe guard period is provided because it is required for the MSs that transmission be attenuated for theperiod between bursts with the necessary ramp up and down occurring during the guard periods asdefined in GSM 05.05. A base transceiver station is not required to have a capability to ramp down and upbetween adjacent bursts, but is required to have a capability to ramp down and up for non-used time-slots,as defined in GSM 05.05. In any case where the amplitude of transmission is ramped up and down, thenby applying an appropriate modulation bit stream interference to other RF channels can be minimized.5.3Physical channels and burstsThe description of a physical channel will be made in terms of timeslots and TDMA frames and not interms of bursts. This is because there is not a one to one mapping between a particular physical channel,and the use of a particular burst.5.4Radio frequency channel sequenceThe radio frequency channel sequence is determined by a function that, in a given cell, with a given set ofgeneral parameters, (see section 5.6.2), with a given timeslot number (TN), a given mobile radiofrequency channel allocation (MA) and a given mobile allocation index offset (MAIO), maps the TDMAframe number (FN) to a radio frequency channel.In a given cell there is therefore, for a physical channel assigned to a particular mobile, a uniquecorrespondence between radio frequency channel and TDMA frame number.The detailed hopping generation algorithm is given in section 6.2.5.5Ti
...