SIST ETS 300 326-2:1999

• Abstract:

  General review to take account of the experience gained in the implementation of the system.

• Status: Published
• Publication Date: 30-Jun-1999
• ICS: 33.060.01 - Radiocommunications in general
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-1999
• Due Date: 01-Jul-1999
• Completion Date: 01-Jul-1999
• Ref Project: ETSI ETS 300 326-2 ed.2 (1998-08) - ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Terrestrial Flight Telecommunications System (TFTS); Part 2: Speech services, radio interface

SIST ETS 300 326-2:1999 is SIST’s version of ETS 300 326-2 Edition 2 from ETSI, for ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM) in the Terrestrial Flight Telecommunications System (TFTS). It specifies the minimum technical requirements of the TFTS radio interface for a pan-European terrestrial aeronautical public correspondence service, so aircraft station and ground station equipment can work together across different operators and implementations.

What does SIST ETS 300 326-2:1999 specify?

SIST ETS 300 326-2:1999 specifies the TFTS radio interface for speech services, including the way the Aircraft Station (AS) and Ground Station System (GSS) communicate over the air. The document defines the minimum technical requirements needed for interoperability and for maintaining the TFTS ground network and radio interface.

The scope places TFTS in the WARC 92 frequency bands 1 670 - 1 675 MHz and 1 800 - 1 805 MHz. In practice, that means the standard is tied to a specific aeronautical spectrum allocation and to equipment that must operate within those bands.

The standard is organized into clauses on:

• Scope
• Normative references
• Abbreviations
• System introduction
• Protocol modelling principles
• TFTS user-to-network reference configuration
• Channel structures and access capabilities
• TFTS Radio Interface layer 1
• TFTS radio interface layer 2
• AS - GSS layer 3 specification

What are the key requirements of SIST ETS 300 326-2:1999?

SIST ETS 300 326-2:1999 sets out the radio interface, the channel structure, and the signalling layers needed for TFTS speech service. The most important requirements are the ones that govern how equipment is built, how it connects, and how it handles calls and mobility.

Radio interface scope and interoperability

The standard requires the TFTS radio interface to support a pan-European terrestrial aeronautical public correspondence service. It also says the interface is defined so that user and network technologies can evolve separately, while still supporting interworking between aircraft equipment from different suppliers and ground stations from different operators.

In practice, this is the part that keeps one aircraft station from depending on a single vendor’s ground system. For procurement and integration, it means the AS-GSS interface is the key compatibility point.

Reference configuration and functional groups

Clause 6 defines the TFTS reference configuration and the main functional groups: Avionics Termination (AT), Airborne Telecommunications Equipment (ATE), and User Termination (UT). It also defines UT0, UT1 and UT2 as different UT types with different terminal-interface support.

This matters because each role has a different responsibility. Aircraft designers and integrators need to know which functions sit in the aircraft, which are standardized, and which reference points are operator-defined.

Channel types and access capability

Clause 7 defines Traffic Channels (TCH) and control channels. The TCH family includes Ba, Ma and La traffic bearer channels, while the logical control channels include BCCH, RACH, IRCCH, RCCH and DCCH.

The practical point is that TFTS is not just “speech over radio” - it is a structured channel system. The access-capability rules specify how many logical channels can exist together, and they link RCCH with DCCH and RACH with IRCCH. That is important for ground-station capacity planning and aircraft-terminal design.

Layer 1 radio transmission and TDMA behaviour

Clause 8 specifies the physical layer. It covers Time Division Multiple Access (TDMA), slot structure, logical-to-physical channel mapping, timing, coding, modulation, and radio transmission and reception characteristics.

This section matters to radio designers and compliance engineers because it fixes the air-interface behaviour. It includes p/4 Differential Quadrature Phase Shift Keying (p/4 DQPSK), scrambling, power ramping, spectrum mask, out-of-band and spurious emissions, channel selection time, frequency stability, and receiver performance under static and dynamic propagation conditions.

Radio link control, handover and synchronization

Clause 8 also defines radio subsystem link control and synchronization. It covers handover, radio frequency power control, cell selection and reselection, Radio Link Measurements (RLM), Radio Link Failure (RLF), and Cold Start Synchronization (CSS), Tracking procedure, and Warm Start Synchronization (WSS).

In practice, this is what keeps a live aeronautical connection usable as the aircraft moves. Operators and implementers need these rules for mobility management, coverage transitions, and recovery after loss of synchronization.

Layer 2 LAPDa

Clause 9 defines the Link Access Protocols on the Da channel (LAPDa). It sets out layer 2 services, peer-to-peer procedures, frame structure, segmentation, acknowledged and unacknowledged information transfer, and multiple-frame operation.

This matters for signalling reliability. The layer 2 rules define how control information moves between the AS and GSS, how errors are handled, and how messages are segmented and reassembled.

Layer 3 signalling

Clause 10 defines layer 3 signalling for Radio Resource Management (RRM), Call Control (CC), and Maintenance Resource Management (MRM). It covers service state diagrams, service primitives, elementary procedures, error handling, message functional definitions, timers, and System Description Language (SDL) process models.

For implementers, this is the call-control and resource-control logic of TFTS. It tells equipment how to set up a call, manage paging and radio-resource connections, clear calls, handle status and error conditions, and exchange the information elements used in those procedures.

What terms does SIST ETS 300 326-2:1999 define?

SIST ETS 300 326-2:1999 uses a large set of abbreviations, and a few are central to understanding the document.

• AS (Aircraft Station) - the aircraft-side station that connects to the GSS over the TFTS radio interface.
• GSS (Ground Station System) - the ground-side system that communicates with the AS and supports the TFTS network.
• TFTS (Terrestrial Flight Telecommunications System) - the aeronautical public correspondence system defined by this standard.
• AT (Avionics Termination) - the aircraft function that handles radio transmission and reception, channel management, mobility management, and interworking to the airborne equipment.
• ATE (Airborne Telecommunications Equipment) - the aircraft equipment terminated by the AT, including call-control and service functions.
• UT (User Termination) - the user-facing functional group in the aircraft, with variants UT0, UT1 and UT2 for different terminal-interface capabilities.
• BCCH (Broadcast Control CHannel) - the broadcast control channel used for system information.
• LAPDa (Link Access Protocols on the Da channel) - the layer 2 protocol used to carry signalling over the Da channels.

Who uses SIST ETS 300 326-2:1999?

SIST ETS 300 326-2:1999 is used by aircraft equipment suppliers, ground-station and network operators, avionics integrators, and conformance test organisations working on TFTS speech service.

Aircraft and terminal designers use it to build the AS, ATE and UT functions so they fit the defined air interface. Ground-network operators use it to size channels, configure access capability, and manage handover and synchronization. Test labs and quality teams use it to verify radio performance, signalling behaviour, and interoperability. It is also relevant to service providers and aircraft operators that must match aircraft-side and ground-side implementations.

What changed in SIST ETS 300 326-2:1999 from the previous edition?

SIST ETS 300 326-2:1999 is the second edition of ETS 300 326-2. The foreword says it is a general review that takes account of experience gained in the implementation of the system.

Which standards are used with SIST ETS 300 326-2:1999?

SIST ETS 300 326-2:1999 uses a set of normative references for numbering, OSI modelling, signalling, and aeronautical interface context.

The most important references named in the document are:

• CCITT Recommendations X.200 and X.210 - the OSI reference model used for protocol layering
• CCITT Recommendations Q.920, Q.921 and Q.931 - the LAPD and basic call-control models used for layer 2 and layer 3 coding
• CCITT Recommendations E.163, E.164, I.330 and I.332 - numbering and addressing principles used in call-related information elements
• CCITT Recommendations I.420 and I.450 - user-network interface references used for terminal-equipment interfaces
• CCITT Recommendations X.21, X.25 and X.121 - data-network interface and numbering references used for data-terminal support
• ARINC Characteristic 746 and ARINC Characteristic 752 - aircraft-side reference points and airborne radio subsystem context
• Aeronautical Telecommunications Annex 10 to the Convention on International Civil Aviation - referenced for aircraft identification and related coding
• ETS 300 789 - conformance testing for TFTS aircraft mobile stations
• I-ES 200 794 - data application and facsimile
• ETS 300 752 - packet data services

What does the SIST ETS 300 326-2:1999 document contain?

SIST ETS 300 326-2:1999 contains detailed radio-interface definitions, signalling procedures, and coded information elements for TFTS speech service. Clause 8 includes TDMA slot structures, modulation characteristics, transmitter and receiver requirements, antenna characteristics, handover, power control, and synchronization. Clause 9 gives LAPDa frame formats, services, primitives, and peer-to-peer procedures.

Clause 10 goes further into signalling content. It includes call control and resource-management procedures, message definitions, information-element coding, timers and counters, and SDL process diagrams for the TFTS layer 3 behaviour. The document also contains figures, tables and state diagrams that support implementation, testing and interoperability checking without leaving the reader to infer protocol behaviour.

SLOVENSKI STANDARD
01-julij-1999
Elektromagnetna združljivost (EMC) in zadeve v zvezi z radijskim spektrom (ERM) -
Prizemni letalski telefonski sistem (TFTS) - 2. del: Govorne storitve, radijski
vmesnik
ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Terrestrial Flight
Telecommunications System (TFTS); Part 2: Speech services, radio interface
Ta slovenski standard je istoveten z: ETS 300 326-2 Edition 2
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
49.090 2SUHPDLQLQVWUXPHQWLY On-board equipment and
]UDþQLKLQYHVROMVNLKSORYLOLK instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 326-2
TELECOMMUNICATION August 1998
STANDARD Second Edition
Source: ERM Reference: RE/ERM-RP05-005-2
ICS: 33.020
Key words: interface, radio, speech, TFTS
Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Terrestrial Flight Telecommunications System (TFTS);
Part 2: Speech services, radio interface
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
Internet: [e-mail] -
http://www.etsi.fr - http://www.etsi.org
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 1998. All rights reserved.

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ETS 300 326-2: August 1998
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 Standards Making Support Dept." at the address shown on the title page.

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ETS 300 326-2: August 1998
Contents
Foreword . 13
Introduction . 13
1 Scope . 15
2 Normative references . 15
3 Abbreviations. 17
4 Introduction to Terrestrial Flight Telecommunications System (TFTS). 19
4.1 General. 19
4.2 Interface specification objectives. 20
4.3 Interface characteristics . 20
5 Protocol modelling principles . 20
5.1 AS-GSS layering. 20
6 TFTS user-to-network reference configuration. 22
6.1 General. 22
6.1.1 Reference configurations . 22
6.1.2 Functional groups. 22
6.1.3 Reference points. 22
6.1.4 Terminal Equipment (TE) . 23
6.2 TFTS reference configuration. 23
6.3 Interfaces. 25
7 Channel structures and access capabilities. 25
7.1 General. 25
7.2 Channel types and their use: Traffic Channels (TCH). 25
7.3 Channel types and their use: Control channels. 26
7.3.1 Logical control channel types. 26
7.3.1.1 Broadcast Control CHannel (BCCH). 26
7.3.1.2 Random Access CHannel (RACH). 26
7.3.1.3 Initial Response Control CHannel (IRCCH). 26
7.3.1.4 Radio Control CHannel (RCCH) . 26
7.3.1.5 Dedicated Control CHannel (DCCH). 26
7.4 GS Access capability . 26
7.5 AS access capability . 28
8 TFTS Radio Interface layer 1. 29
8.1 Interfaces to the physical layer. 29
8.1.1 Interface to layer 2. 29
8.1.2 Interface to radio resource management. 29
8.1.3 Interface to other functional units. 29
8.2 Services of layer 1 . 30
8.2.1 Service Access Point (SAP). 30
8.2.2 Service provided . 30
8.2.2.1 Specific services of layer 1 in the AS. 30
8.3 Primitives of layer 1. 31
8.3.1 Generic names of primitives between layer 1 and layer 2 for the transfer
of layer 2 frames. 31
8.3.2 Generic names of primitives between layer 1 and the radio resource
management entity of layer 3 . 31

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ETS 300 326-2: August 1998
8.3.3 Primitive types. 32
8.3.4 Parameter definition. 32
8.4 Layer 1 procedures. 33
8.4.1 States of layer 1. 33
8.4.2 Remap procedure. 33
8.4.2.1 Channel remap protocol . 34
8.4.3 Layer 1 interface procedures. 34
8.5 Layer 1 peer to peer exchanges. 35
8.5.1 BCCH Synchronization (S) transmission. 35
8.5.2 Layer 1 radio control. 35
8.5.3 Layer 1 random access procedures. 35
8.5.4 Layer 1 channel access transaction . 36
8.6 TDMA characteristics (Time Division Multiple Access). 36
8.6.1 General . 36
8.6.2 Slot structure . 37
8.6.2.1 General slot types . 37
8.6.2.1.1 Field data . 38
8.6.2.2 Synchronization slot types . 38
8.6.2.2.1 Field data . 38
8.6.3 Functions of logical channels and mapping to physical channels. 40
8.6.4 Timing requirements . 44
8.6.5 Coding aspects . 44
8.6.5.1 G1 slot. 44
8.6.5.2 G2 slot. 44
8.6.5.3 G3 slot. 44
8.6.5.4 Coding and interleaving of G2 and G3 slots . 44
8.6.5.5 Coding of S1 slot . 46
8.6.5.6 Coding of S2 slot . 46
8.7 Modulation characteristics. 46
8.7.1 General . 46
8.7.1.1 Type of modulation . 46
8.7.1.2 Channel transmission rate. 47
8.7.1.3 Data clock stability. 47
8.7.2 Modulator . 47
8.7.2.1 Phase definition . 47
8.7.2.2 Modulation filtering and modulated signal definition . 48
8.7.2.3 Modulator and transmitter accuracy . 49
8.7.2.3.1 Ideal case. 50
8.7.2.3.2 Real case . 50
8.7.2.4 Scrambler . 51
8.8 Radio transmission and reception characteristics. 51
8.8.1 General characteristics. 51
8.8.1.1 Channelling. 51
8.8.1.1.1 Frequency range . 51
8.8.1.1.2 Radio frequency channel arrangement. 52
8.8.1.2 Channel selection time. 52
8.8.1.3 Frequency stability. 52
8.8.1.3.1 AS. 52
8.8.1.3.2 GS . 52
8.8.1.4 Modulation . 52
8.8.2 Transmitter . 52
8.8.2.1 Polarization . 52
8.8.2.2 Radiated power. 52
8.8.2.2.1 AS. 52
8.8.2.2.2 GS . 53
8.8.2.3 Power ramping procedure in the AS. 54
8.8.2.4 RF spectrum mask. 54
8.8.2.5 Out of band emissions. 55
8.8.2.6 Spurious emissions . 55
8.8.2.7 Modulation accuracy . 55

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ETS 300 326-2: August 1998
8.8.3 Receiver. 55
8.8.3.1 Frequency offsets. 55
8.8.3.2 Static propagation conditions. 56
8.8.3.2.1 Without interferer . 56
8.8.3.2.2 With an interferer created by the
intermodulation of two interfering
signals. 56
8.8.3.2.3 With adjacent interferer: TDM at the
AS receiver and TDMA (uniform
timeslot level) at the GS receiver. 56
8.8.3.2.4 With co-channel TDMA interferer:
variable timeslot level for GS receiver . 57
8.8.4 Dynamic propagation conditions . 57
8.8.4.1 Basic BERs. 57
8.8.4.2 BERs with interfering signals . 57
8.8.4.3 GS receivers. 58
8.8.5 Propagation models. 58
8.8.5.1 General . 58
8.8.5.2 Doppler spectrum types. 58
8.8.5.3 Models . 59
8.8.5.3.1 Airport manoeuvring. 59
8.8.5.3.2 Take-off . 60
8.8.5.3.3 In-flight. 60
8.9 GS antenna characteristics. 60
8.9.1 General. 60
8.9.2 Common characteristics for all GS types. 60
8.9.2.1 Frequency range . 60
8.9.2.2 Polarization . 60
8.9.2.3 Energy acceptance capability . 61
8.9.3 Specific characteristics for each type of GS . 61
8.9.3.1 Radiation patterns . 61
8.9.3.1.1 En route stations. 61
8.9.3.1.2 Intermediate stations. 62
8.9.3.1.3 Airport stations. 62
8.9.3.2 Antenna height. 62
8.10 Radio sub-system link control. 62
8.10.1 General. 62
8.10.2 Handover general. 62
8.10.2.1 Overall process. 62
8.10.2.2 Decision strategy for GS to GS handover. 63
8.10.2.2.1 Primary handover decision . 63
8.10.3 R.F. power control . 63
8.10.3.1 Purpose. 63
8.10.3.2 Timing. 63
8.10.3.3 Initial exchanges. 63
8.10.4 RF power control at call initiation. 64
8.10.5 Handover procedure. 65
8.10.6 Cell selection and re-selection. 65
8.10.6.1 Overall process. 65
8.10.6.2 Reception of broadcast information. 65
8.10.6.3 GS selection . 65
8.10.6.4 Synchronization . 66
8.10.6.5 Negotiation. 66
8.10.7 Network pre-requisites. 66
8.10.7.1 BCCH. 66
8.10.7.1.1 BCCH(S) . 66
8.10.7.1.2 BCCH(D). 66
8.10.7.2 GS Handover . 67
8.10.8 Radio Link Measurements (RLM) . 67
8.10.8.1 Signal strength . 67

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ETS 300 326-2: August 1998
8.10.8.2 Signal quality. 67
8.10.8.2.1 AS. 67
8.10.8.2.2 GS . 67
8.10.8.2.3 Range of parameter . 67
8.10.8.3 Absolute distance (AS only). 67
8.10.8.3.1 Range of parameter . 68
8.10.8.4 Radio Link Failure (RLF). 68
8.10.9 Timing control. 68
8.10.10 Control parameters. 68
8.10.10.1 Definition of network parameters. 68
8.10.10.2 Definition of Radio Resource (RR) parameters. 69
8.10.10.3 Definition of other parameters. 70
8.10.10.4 Calculation of range limit. 70
8.11 Radio sub-system synchronization . 71
8.11.1 Introduction. 71
8.11.2 GS synchronization. 71
8.11.3 Cold Start Synchronization (CSS) . 71
8.11.3.1 AS cold start requirements . 71
8.11.3.1.1 GS acquisition. 71
8.11.3.1.2 Transmitted S2 slot . 72
8.11.3.1.3 Received G3 slot. 72
8.11.3.1.4 Timing adjustment. 72
8.11.3.2 GS cold start requirements. 72
8.11.3.2.1 S2 reception . 72
8.11.4 Tracking procedure. 72
8.11.4.1 AS requirements. 72
8.11.4.2 GS requirements . 72
8.11.5 Warm Start Synchronization (WSS) . 72
8.11.5.1 GS . 72
8.11.5.2 AS. 72
9 TFTS radio interface layer 2. 73
9.1 General. 73
9.2 Layer 2 services. 73
9.3 Overview description of LAPDa functions and procedures . 75
9.3.1 General . 75
9.3.2 Unacknowledged operation . 76
9.3.3 Acknowledged operation. 77
9.3.4 Information transfer mode. 77
9.3.4.1 Information transfer on the BCCH. 77
9.3.4.2 Information transfer on the DCCHs. 77
9.3.5 Release of layer 2. 77
9.3.6 Identification of layer 2 end points. 77
9.4 Service characteristics and requirements . 78
9.4.1 General requirements . 78
9.4.2 Services provided to layer 3. 78
9.4.2.1 General. 78
9.4.2.2 Priority. 78
9.4.2.3 Segmentation . 78
9.4.2.4 Unacknowledged information transfer service. 79
9.4.2.5 Acknowledged information transfer service . 79
9.4.3 Services required from the physical layer . 80
9.4.4 Administrative services. 81
9.4.4.1 General description of administrative services. 81
9.4.4.2 Definition of primitives for administrative services . 81
9.5 Overview of layer 2 structure . 82
9.5.1 Functional composition. 82
9.5.2 Layer 2 procedure. 82
9.6 Layer 2 specification. 83
9.6.1 General . 83

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ETS 300 326-2: August 1998
9.6.2 Frame structure for peer-to-peer communication . 83
9.6.2.1 General . 83
9.6.2.2 Frame format . 83
9.6.2.3 Frame delimitation . 83
9.6.2.4 Header field . 84
9.6.2.5 Information field. 84
9.6.2.6 Fill field. 84
9.6.2.7 Frame Check Sequence. 84
9.6.2.8 Format convention . 84
9.6.2.8.1 Numbering convention. 84
9.6.2.8.2 Mapping to layer 1 message data. 85
9.6.2.8.3 Field mapping convention. 85
9.6.2.9 Invalid frames. 85
9.6.3 Elements of procedure and formats of fields for data-link layer peer-to-
peer communication. 85
9.6.3.1 General . 85
9.6.3.2 Header field format. 86
9.6.3.3 Header field variables . 86
9.6.3.3.1 Command/Response field bit (C/R). 86
9.6.3.3.2 Service Access Point Identifier . 86
9.6.3.3.3 Length field. 86
9.6.3.3.4 More data bit (M). 86
9.6.3.3.5 Control field . 87
9.6.3.4 Control field formats . 87
9.6.3.4.1 Information transfer (I) format . 87
9.6.3.4.2 Supervisory (S) format. 87
9.6.3.4.3 Unnumbered (U) format . 87
9.6.3.5 Control field parameters and associated state variables . 87
9.6.3.5.1 Poll/Final bit. 87
9.6.3.5.2 Multiple frame operation, variables and
sequence numbers . 88
9.6.3.5.3 Unacknowledged operation - variables
and parameters. 88
9.6.3.6 Frame types. 89
9.6.3.6.1 Commands and responses. 89
9.6.3.6.2 Information (I) commands . 89
9.6.3.6.3 Set Asynchronous Balanced Mode
(SABM) command. 89
9.6.3.6.4 DISConnect (DISC) command. 90
9.6.3.6.5 Unnumbered information (UI)
command. 90
9.6.3.6.6 Receive Ready (RR)
command/response. 90
9.6.3.6.7 Reject (REJ) command/response . 90
9.6.3.6.8 Receive Not Ready (RNR)
command/response. 91
9.6.3.6.9 Unnumbered Acknowledgement (UA)
response . 91
9.6.3.6.10 Disconnected Mode (DM) response. 91
9.6.3.6.11 FRaMe Reject (FRMR) response . 91
9.6.4 Elements for layer-to-layer communication . 92
9.6.4.1 General . 92
9.6.4.1.1 Generic names. 92
9.6.4.1.2 Primitive types . 95
9.6.4.1.3 Parameter definition . 95
9.6.4.2 Primitive procedures . 96
9.6.5 Definition of the peer-to-peer procedures of the data link layer . 96
9.6.5.1 General . 96
9.6.5.2 Procedure for the use of the P/F bit . 97
9.6.5.2.1 Unacknowledged information transfer. 97

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ETS 300 326-2: August 1998
9.6.5.2.2 Acknowledged multiple frame
information transfer. 97
9.6.5.3 Procedures for unacknowledged information transfer. 97
9.6.5.3.1 General . 97
9.6.5.3.2 Transmission of unacknowledged
information. 97
9.6.5.3.3 Receipt of unacknowledged
information. 97
9.6.5.4 Procedures for establishment and release of multiple
frame operation. 98
9.6.5.4.1 Establishment of multiple frame
operation . 98
9.6.5.4.2 Information transfer . 101
9.6.5.4.3 Suspension and resumption of multiple
frame operation. 102
9.6.5.4.4 Resumption of multiple frame
operation . 103
9.6.5.4.5 Termination of multiple frame
operation . 104
9.6.5.4.6 Idle state . 105
9.6.5.4.7 Collision of unnumbered commands
and responses . 106
9.6.5.5 Procedures for information transfer in multiple frame
operation. 106
9.6.5.5.1 Transmitting I frames. 106
9.6.5.5.2 Receiving I frames. 107
9.6.5.5.3 Receiving acknowledgement. 108
9.6.5.5.4 Receiving REJ frames. 108
9.6.5.5.5 Receiving RNR frames. 109
9.6.5.5.6 Data link layer own receiver busy
condition. 111
9.6.5.5.7 Waiting acknowledgement. 111
9.6.5.6 Abnormal release and re-establishment of multiple frame
operation. 112
9.6.5.6.1 Criteria for re-establishment. 112
9.6.5.6.2 Criteria for abnormal release. 112
9.6.5.6.3 Procedures for re-establishment. 112
9.6.5.6.4 Procedures for abnormal release. 112
9.6.5.7 Exception condition reporting and recovery for multiple
frame operation. 113
9.6.5.7.1 N(S) sequence error. 113
9.6.5.7.2 N(R) sequence error. 113
9.6.5.7.3 Timer recovery. 114
9.6.5.7.4 Invalid frame condition . 114
9.6.5.7.5 Frame rejection condition . 114
9.6.5.7.6 Receipt of an FRMR response frame. 114
9.6.5.7.7 Radio link failure condition. 114
9.6.5.8 List of system parameters. 114
9.6.5.8.1 Timer T200. 114
9.6.5.8.2 Maximum number of re-transmissions
(N200). 114
9.6.5.8.3 Maximum number of octets in an
information field (N201). 115
9.6.5.8.4 Number of octets in a frame (N202) . 115
9.6.5.8.5 Maximum number of octets in a
message unit parameter (N203) . 115
9.6.5.8.6 Maximum number of outstanding I
frames (k). 115
10 AS - GSS layer 3 specification . 115

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ETS 300 326-2: August 1998
10.1 Introduction. 115
10.1.1 General. 115
10.1.2 Objectives . 115
10.1.3 General characteristics. 115
10.1.3.1 Technique of description. 115
10.1.3.2 Primitives. 116
10.1.3.3 Peer-to-peer communication. 116
10.2 Structure of signalling functions . 116
10.2.1 Basic groups of functions. 116
10.2.2 Protocol architecture . 116
10.3 Services provided by signalling layer 3 on the AS side. 118
10.3.1 CC services. 118
10.3.1.1 General . 118
10.3.1.2 Service state diagram. 118
10.3.1.3 Service primitives. 119
10.4 Services provided by signalling layer 3 on the GSS side. 120
10.4.1 CC services. 120
10.4.1.1 General . 120
10.4.1.2 Service state diagram. 120
10.4.1.3 Service primitives. 121
10.5 Services assumed from signalling layer 2. 122
10.5.1 General. 122
10.5.2 Service primitives . 122
10.5.2.1 Unacknowledged information transfer. 122
10.5.2.2 Acknowledged information transfer . 122
10.6 Inter-layer service interfaces on the AS side. 123
10.6.1 Services provided by the RRM entity . 123
10.6.1.1 General . 123
10.6.1.2 Service state diagram. 124
10.6.1.3 Service primitives. 124
10.7 Inter-layer service interfaces on the GS side. 126
10.7.1 Services provided by the RRM entity . 126
10.7.1.1 General . 126
10.7.1.2 Service state diagram. 127
10.7.1.3 Service primitives. 127
10.8 Service assumed from layer 1. 128
10.8.1 General. 128
10.8.2 Service primitives . 128
10.9 Functions provided by layer 3 entities . 129
10.9.1 Functions provided by the RRM entity. 129
10.9.2 Functions provided by the CC management entity. 129
10.9.3 Functions provided by the distribution entity. 129
10.9.4 Functions provided by the MR entity . 129
10.10 Call setup examples . 129
10.11 Radio interface layer 3 specification . 131
10.11.1 General. 131
10.11.1.1 Scope of the specification . 131
10.11.1.2 Application to the interface structure . 131
10.11.1.3 Structure of the layer 3 procedures. 132
10.11.1.4 Test procedures . 132
10.11.1.5 Use of logical channels. 132
10.11.2 Overview of control procedures. 132
10.11.2.1 List of procedures. 132
10.11.2.2 Procedure for contention resolution. 133
10.11.2.3 General recovery procedures . 133
10.11.2.3.1 Normal message flow. 133
10.11.2.3.2 Expiry of the request timer T . 133
10.11.2.3.3 Change of dedicated channels using
SAPI=0 . 133
10.11.2.4 Sequenced message transfer operation . 134

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ETS 300 326-2: August 1998
10.11.2.4.1 Variables and sequence numbers . 134
10.11.2.4.2 Procedure for the setting, transfer and
termination of sequenced message
transfer. 134
10.11.3 Elementary procedures for RRM . 135
10.11.3.1 Overview. 135
10.11.3.1.1 General . 135
10.11.3.1.2 Service provided to upper layers. 135
10.11.3.1.3 Service required from data link and
physical layers . 136
10.11.3.1.4 Terminology. 136
10.11.3.2 System management procedures. 136
10.11.3.2.1 BCCH (D) data acquisition (AS side). 136
10.11.3.2.2 Other system data acquisition (AS
side). 137
10.11.3.2.3 Broadcast system information (GS
side). 137
10.11.3.3 Paging procedures. 138
10.11.3.3.1 Paging of a subscriber . 138
10.11.3.3.2 Engineering paging (ENGPAGE). 139
10.11.3.3.3 Group broadcast . 140
10.11.3.4 RR connection establishment initiated by the AS. 140
10.11.3.4.1 Request for resources by the AS. 140
10.11.3.4.2 Answer from the GS. 141
10.11.3.4.3 Negotiation process. 141
10.11.3.4.4 Assignment completion . 141
10.11.3.4.5 Abnormal cases . 141
10.11.3.4.6 Remap Procedure for radio resource
establishment. 142
10.11.3.5 RR-connection transfer phase. 142
10.11.3.5.1 Transfer of messages. 142
10.11.3.5.2 Handover procedure . 142
10.11.3.5.3 Additional channel assignment . 145
10.11.3.5.4 Release of assigned channels . 146
10.11.3.6 RR-connection release. 147
10.11.3.6.1 Normal release. 147
10.11.3.7 Alternative procedure. 147
10.11.3.7.1 General . 147
10.11.3.7.2 Radio link failure. 148
10.11.3.7.3 Ground network failure. 149
10.11.3.7.4 Remap failure. 149
10.11.3.7.5 Remap interruption . 149
10.11.4 Elementary procedures for circuit-switched CC. 149
10.11.4.1 Overview. 149
10.11.4.1.1 General . 149
10.11.4.1.2 CC states . 152
10.11.4.1.3 Circuit-switched CC procedures. 153
10.11.4.2 Aircraft originating call establishment procedures . 153
10.11.4.2.1 General . 153
10.11.4.2.2 Call request . 153
10.11.4.2.3 Invalid call information. 154
10.11.4.2.4 Call proceeding . 154
10.11.4.2.5 Notification of interworking in
connection with call establishment. 155
10.11.4.2.6 Call confirmation indication . 155
10.11.4.2.7 Call connected . 156
10.11.4.2.8 Call rejection. 156
10.11.4.3 Signalling procedures during the active state. 156
10.11.4.3.1 User notification procedure. 156
10.11.4.3.2 Call rearrangements . 156

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ETS 300 326-2: August 1998
10.11.4.3.3 Dual Tone Multi-Frequency protocol
control procedure. 156
10.11.4.4 Call clearing . 158
10.11.4.4.1 Terminology. 158
10.11.4.4.2 Exception conditions. 158
10.11.4.4.3 Clearing initiated by the AS . 158
10.11.4.4.4 Clearing initiated by the GSS. 159
10.11.4.4.5 Clear collision. 160
10.11.4.5 Miscellaneous procedures. 161
10.11.4.5.1 In-band tones and announcements. 161
10.11.4.5.2 Status procedures. 161
10.11.5 Elementary procedures for maintenance resource management. 162
10.11.5.1 Overview . 162
10.11.5.1.1 General. 162
10.11.5.2 GSS originated signalling procedures. 163
10.11.5.2.1 General. 163
10.11.5.2.2 Paging. 163
10.11.5.2.3 Engineering paging. 164
10.11.5.2.4 Shutdown . 165
10.11.5.2.5 Operation and Maintenance (OM). 165
10.11.6 Handling of error conditions. 169
10.11.6.1 General . 169
10.11.6.2 Protocol discrimination error. 169
10.11.6.3 Message too short. 169
10.11.6.4 Transaction identifier error. 169
10.11.6.4.1 Call control . 169
10.11.6.4.2 Radio resource . 169
10.11.6.4.3 MR. 169
10.11.6.5 Message type error . 169
10.11.6.5.1 Call control . 169
10.11.6.5.2 Radio resource . 170
10.11.6.5.3 MR. 170
10.11.6.6 General information elements errors . 170
10.11.6.6.1 Information element out of sequence. 170
10.11.6.6.2 Duplicated information element. 170
10.11.6.7 Mandatory information element error. 170
10.11.6.7.1 Call control . 170
10.11.6.7.2 Radio resource . 171
10.11.6.8 Non-mandatory information element errors . 171
10.11.6.8.1 Unrecognized information element. 171
10.11.6.8.2 Non-mandatory information element
content error. 172
10.11.7 Message functional definitions and contents . 172
10.11.7.1 Messages for
...