VHF air-ground Digital Link (VDL) Mode 2 - Technical characteristics and methods of measurement for ground-based equipment - Part 2: Upper layers

The present document covers the link and sub-network access layers of Very High Frequency (VHF) Digital Link. The
present document applies to VDL Mode 2 ground-based stations operating in the VHF band (117,975 MHz to
137,000 MHz) with 25 kHz channel spacing and using Differential Eight Phase Shift Keying (D8PSK).
The present document provides functional specifications for ground-based radio transmitters, receivers, and transceivers
intended to be used for ground-air data communications. The present document is derived from the following
documents:
• VDL Mode 2 SARPs. ICAO, annex 10 Volume III part I [1] second edition, July 2007;
• ICAO Doc 9776: "Manual on VHF Digital Link (VDL) Mode 2" [10].

Digitalne povezave VHF zrak-tla, 2. način - Tehnične karakteristike in merilne metode za talno opremo - 2. del: Zgornje plasti

Ta dokument zajema plasti za povezavo in podomrežni dostop do zelo visokofrekvenčnih (VHF) digitalnih povezav. Ta dokument se uporablja za zemeljske postaje z zelo visokofrekvenčno (VHF) digitalno povezavo (VDL), 2. način, ki delujejo v visokofrekvenčnem pasu (od 117.975 MHz do 137.000 MHz) z razmikom 25 kHz med kanali in uporabljajo diferencialno osemfazno premično šifriranje (D8PSK).
Ta dokument podaja funkcionalne specifikacije za talne radijske oddajnike, sprejemnike in oddajno-sprejemne naprave, namenjene za podatkovno komunikacijo tla-zrak. Ta dokument izhaja iz naslednjih dokumentov:
• Zelo visokofrekvenčna digitalna povezava, 2. način, standardi in priporočene prakse (SARP). ICAO, dodatek 10, zvezek III, del I [1], druga izdaja, julij 2007;
• ICAO dokument 9776: »Manual on VHF Digital Link (VDL) Mode 2« [10].

General Information

Status
Published
Public Enquiry End Date
30-Apr-2019
Publication Date
05-Jun-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Jun-2019
Due Date
08-Aug-2019
Completion Date
06-Jun-2019
Mandate

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ETSI EN 301 841-2 V1.2.1 (2019-05)
EUROPEAN STANDARD
VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and
methods of measurement
for ground-based equipment;
Part 2: Upper layers
---------------------- Page: 1 ----------------------
2 ETSI EN 301 841-2 V1.2.1 (2019-05)
Reference
REN/ERM-TGAERO-56
Keywords
aeronautical, radio, testing
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI

deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at

https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx

If you find errors in the present document, please send your comment to one of the following services:

https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification

No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2019.
All rights reserved.
TM TM TM

DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

TM TM

3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.

oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and

of the oneM2M Partners.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 ETSI EN 301 841-2 V1.2.1 (2019-05)
Contents

Intellectual Property Rights .............................................................................................................................. 11

Foreword ........................................................................................................................................................... 11

Modal verbs terminology .................................................................................................................................. 11

Introduction ...................................................................................................................................................... 12

1 Scope ...................................................................................................................................................... 13

2 References .............................................................................................................................................. 13

2.1 Normative references ....................................................................................................................................... 13

2.2 Informative references ...................................................................................................................................... 14

3 Definition of terms, symbols and abbreviations ..................................................................................... 14

3.1 Terms ................................................................................................................................................................ 14

3.1.1 Basic reference model terms ....................................................................................................................... 14

3.1.2 Service conventions terms .......................................................................................................................... 15

3.1.3 General terms .............................................................................................................................................. 15

3.2 Symbols ............................................................................................................................................................ 15

3.3 Abbreviations ................................................................................................................................................... 15

4 General architecture of VDL Mode 2 ..................................................................................................... 17

5 Link layer protocols and services functional specifications ................................................................... 18

5.0 Overview .......................................................................................................................................................... 18

5.1 MAC sublayer specifications ........................................................................................................................... 19

5.1.0 MAC General Requirements....................................................................................................................... 19

5.1.1 MAC services ............................................................................................................................................. 19

5.1.1.1 Multiple access ...................................................................................................................................... 19

5.1.1.2 Channel congestion ............................................................................................................................... 19

5.1.2 MAC service system parameters ................................................................................................................ 20

5.1.2.0 General Requirements ........................................................................................................................... 20

5.1.2.1 Timer TM1 (inter-access delay timer)................................................................................................... 20

5.1.2.2 Timer TM2 (channel busy timer) .......................................................................................................... 20

5.1.2.3 Parameter p (persistence) ...................................................................................................................... 20

5.1.2.4 Counter M1 (maximum number of access attempts) ............................................................................ 20

5.1.3 Description of procedures ........................................................................................................................... 20

5.1.3.1 Channel sensing .................................................................................................................................... 20

5.1.3.2 P-persistent CSMA access times ........................................................................................................... 20

5.1.3.3 Inter-access interval .............................................................................................................................. 21

5.1.3.4 Channel access procedure ..................................................................................................................... 21

5.1.3.4.1 Purpose ............................................................................................................................................ 21

5.1.3.4.2 Use ................................................................................................................................................... 21

5.1.3.4.3 Procedure ......................................................................................................................................... 21

5.1.3.5 AVLC frame reception .......................................................................................................................... 21

5.1.3.5.1 Purpose ............................................................................................................................................ 21

5.1.3.5.2 Use ................................................................................................................................................... 21

5.1.3.5.3 Procedure ......................................................................................................................................... 21

5.2 Data link layer service protocol specifications ................................................................................................. 22

5.2.1 Interface with MAC sub layer..................................................................................................................... 22

5.2.1.0 General considerations .......................................................................................................................... 22

5.2.1.1 Sequence of primitives .......................................................................................................................... 22

5.2.2 Data Link State Machines ........................................................................................................................... 23

5.2.2.0 Introduction ........................................................................................................................................... 23

5.2.2.1 LME state machine ............................................................................................................................... 24

5.2.2.2 DLE top state machine .......................................................................................................................... 25

5.2.2.3 DLE data transfer state diagram ............................................................................................................ 25

5.2.2.4 DLE selective reject state machines ...................................................................................................... 26

5.2.2.4.1 SRM mode Sending SREJ ............................................................................................................... 26

5.2.2.4.2 SRM mode Receiving SREJ ............................................................................................................ 27

ETSI
---------------------- Page: 3 ----------------------
4 ETSI EN 301 841-2 V1.2.1 (2019-05)

5.2.2.4.3 FRM mode ....................................................................................................................................... 28

5.2.2.5 DLE termination state machine ............................................................................................................. 28

5.2.3 Services ....................................................................................................................................................... 29

5.2.3.1 Received frame sequencing procedure .................................................................................................. 29

5.2.3.1.0 General requirements ....................................................................................................................... 29

5.2.3.1.1 Purpose ............................................................................................................................................ 29

5.2.3.1.2 Use ................................................................................................................................................... 29

5.2.3.1.3 Procedure ......................................................................................................................................... 29

5.2.3.2 Error detection procedure ...................................................................................................................... 29

5.2.3.2.1 Purpose ............................................................................................................................................ 29

5.2.3.2.2 Use ................................................................................................................................................... 29

5.2.3.2.3 Procedure ......................................................................................................................................... 30

5.2.3.3 Station identification ............................................................................................................................. 30

5.2.3.4 Broadcast addressing ............................................................................................................................. 30

5.2.3.5 Data transfer .......................................................................................................................................... 30

5.2.4 Frame format .............................................................................................................................................. 30

5.2.4.0 General .................................................................................................................................................. 30

5.2.4.1 Address structure ................................................................................................................................... 30

5.2.4.2 Address fields ........................................................................................................................................ 31

5.2.4.2.0 General requirements ....................................................................................................................... 31

5.2.4.2.1 Air-ground status bit ........................................................................................................................ 31

5.2.4.2.2 Command/response status bit .......................................................................................................... 31

5.2.4.2.3 Data link service addresses .............................................................................................................. 31

5.2.4.2.4 Address type .................................................................................................................................... 31

5.2.4.2.5 Aircraft specific addresses ............................................................................................................... 31

5.2.4.2.6 ICAO-administered ground station specific addresses .................................................................... 31

5.2.4.2.7 ICAO-delegated ground station specific addresses ......................................................................... 32

5.2.4.3 Broadcast address .................................................................................................................................. 32

5.2.4.3.0 General Requirements ..................................................................................................................... 32

5.2.4.3.1 Encoding .......................................................................................................................................... 32

5.2.4.4 Link control field .................................................................................................................................. 32

5.2.4.5 Information field ................................................................................................................................... 32

5.2.5 Transmit queues management..................................................................................................................... 33

5.2.6 Data link service system parameters ........................................................................................................... 33

5.2.6.0 General requirements ............................................................................................................................ 33

5.2.6.1 Parameter T1 (delay before non acknowledged retransmission) ........................................................... 34

5.2.6.2 Parameter T2 (delay before acknowledgment)...................................................................................... 34

5.2.6.3 Parameter T3 (link initialization time) .................................................................................................. 34

5.2.6.4 Parameter T4 (maximum delay between transmissions) ....................................................................... 34

5.2.6.4.0 General requirements ....................................................................................................................... 34

5.2.6.4.1 Recommendation ............................................................................................................................. 34

5.2.6.5 Parameter N1 (maximum number of bits of any frame) ....................................................................... 35

5.2.6.6 Counter N2 (maximum number of transmissions) ................................................................................ 35

5.2.6.7 Parameter k (window size) .................................................................................................................... 35

5.2.6.8 Parameter G (Maximum number of frames in a burst) ......................................................................... 35

5.2.7 DLE retransmission timers ......................................................................................................................... 35

5.2.8 Description of procedures ........................................................................................................................... 35

5.2.8.0 General Requirements ........................................................................................................................... 35

5.2.8.1 Procedure retransmission schedule ....................................................................................................... 35

5.2.8.1.1 Purpose ............................................................................................................................................ 35

5.2.8.1.2 Use ................................................................................................................................................... 35

5.2.8.1.3 Procedure ......................................................................................................................................... 36

5.2.8.2 Procedure frame retransmission ............................................................................................................ 36

5.2.8.2.1 Purpose ............................................................................................................................................ 36

5.2.8.2.2 Use ................................................................................................................................................... 36

5.2.8.2.3 Procedure ......................................................................................................................................... 36

5.2.8.3 Procedure XID frame retransmission .................................................................................................... 36

5.2.8.3.1 Purpose ............................................................................................................................................ 36

5.2.8.3.2 Use ................................................................................................................................................... 36

5.2.8.3.3 Procedure ......................................................................................................................................... 36

5.2.8.4 Procedure link monitoring ..................................................................................................................... 36

5.2.8.4.1 Purpose ............................................................................................................................................ 36

ETSI
---------------------- Page: 4 ----------------------
5 ETSI EN 301 841-2 V1.2.1 (2019-05)

5.2.8.4.2 Use ................................................................................................................................................... 36

5.2.8.4.3 Procedure ......................................................................................................................................... 37

5.2.8.5 Procedure link recovery ........................................................................................................................ 37

5.2.8.5.1 Purpose ............................................................................................................................................ 37

5.2.8.5.2 Use ................................................................................................................................................... 37

5.2.8.5.3 Procedure ......................................................................................................................................... 37

5.2.9 Modes of operation to be supported ............................................................................................................ 37

5.2.9.1 Operational mode .................................................................................................................................. 37

5.2.9.2 Non-operational mode ........................................................................................................................... 37

5.2.9.2.0 General ............................................................................................................................................ 37

5.2.9.2.1 DISC frame ...................................................................................................................................... 37

5.2.9.2.2 DM frame ........................................................................................................................................ 37

5.2.9.3 Frame reject mode ................................................................................................................................. 38

5.2.9.4 Sent selective reject mode ..................................................................................................................... 38

5.2.10 Use of the P/F bit ........................................................................................................................................ 38

5.2.10.1 General .................................................................................................................................................. 38

5.2.10.2 INFO frames ......................................................................................................................................... 38

5.2.10.3 Recommendation .................................................................................................................................. 38

5.2.10.4 Unnumbered frames .............................................................................................................................. 38

5.2.11 Unnumbered command frame collisions .................................................................................................... 38

5.2.11.0 General Requirements ........................................................................................................................... 38

5.2.11.1 DLE procedures .................................................................................................................................... 38

5.2.11.2 LME procedures .................................................................................................................................... 39

5.2.12 XID frame ................................................................................................................................................... 39

5.2.13 Broadcast .................................................................................................................................................... 39

5.2.14 Information transfer .................................................................................................................................... 39

5.2.14.1 General Requirements and Recommendation ....................................................................................... 39

5.2.14.1.0 Procedures for information transfer ................................................................................................. 39

5.2.14.1.1 Eliminate redundant frames ............................................................................................................. 39

5.2.14.1.2 Recommendation ............................................................................................................................. 39

5.2.14.1.3 Recommendation ............................................................................................................................. 39

5.2.14.1.4 Recommendation ............................................................................................................................. 39

5.2.14.1.5 Procedures for transmission ............................................................................................................. 39

5.2.14.1.6 Recommendation ............................................................................................................................. 39

5.2.14.1.7 Recommendation ............................................................................................................................. 40

5.2.14.1.8 Recommendation ............................................................................................................................. 40

5.2.14.2 SREJ frame ........................................................................................................................................... 40

5.2.14.3 FRMR frame ......................................................................................................................................... 40

5.2.14.4 UA frame .............................................................................................................................................. 40

5.2.14.5 UI frame ................................................................................................................................................ 40

5.2.14.6 TEST frame ........................................................................................................................................... 40

5.3 VDL management entity .................................................................................................................................. 41

5.3.1 Services ....................................................................................................................................................... 41

5.3.1.1 Link provision ....................................................................................................................................... 41

5.3.1.2 Link change notifications ...................................................................................................................... 41

5.3.2 Exchange identity (XID) parameter ............................................................................................................ 41

5.3.2.0 Overview ............................................................................................................................................... 41

5.3.2.1 Encoding ............................................................................................................................................... 41

5.3.2.2 Public parameters .................................................................................................................................. 41

5.3.2.2.0 General requirements ....................................................................................................................... 41

5.3.2.2.1 HDLC public parameter set identifier ............................................................................................. 42

5.3.2.2.2 Timer T1 parameter ......................................................................................................................... 42

5.3.2.3 VDL private parameters ........................................................................................................................ 42

5.3.2.4 General purpose information private parameters .................................................................................. 43

5.3.2.4.0 General requirements ....................................................................................................................... 43

5.3.2.4.1 VDL private parameter set identifier ............................................................................................... 43

5.3.2.4.2 Connection management parameter ................................................................................................ 43

5.3.2.4.3 Signal Quality Parameter (SQP) ..............................................

...

Draft ETSI EN 301 841-2 V1.2.0 (2019-02)
EUROPEAN STANDARD
VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and
methods of measurement
for ground-based equipment;
Part 2: Upper layers
---------------------- Page: 1 ----------------------
2 Draft ETSI EN 301 841-2 V1.2.0 (2019-02)
Reference
REN/ERM-TGAERO-56
Keywords
aeronautical, radio, testing
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI

deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at

https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx

If you find errors in the present document, please send your comment to one of the following services:

https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification

No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2019.
All rights reserved.
TM TM TM

DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

TM TM

3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.

oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and

of the oneM2M Partners.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 Draft ETSI EN 301 841-2 V1.2.0 (2019-02)
Contents

Intellectual Property Rights .............................................................................................................................. 11

Foreword ........................................................................................................................................................... 11

Modal verbs terminology .................................................................................................................................. 11

Introduction ...................................................................................................................................................... 12

1 Scope ...................................................................................................................................................... 13

2 References .............................................................................................................................................. 13

2.1 Normative references ....................................................................................................................................... 13

2.2 Informative references ...................................................................................................................................... 14

3 Definition of terms, symbols and abbreviations ..................................................................................... 14

3.1 Terms ................................................................................................................................................................ 14

3.1.1 Basic reference model terms ....................................................................................................................... 14

3.1.2 Service conventions terms .......................................................................................................................... 15

3.1.3 General terms .............................................................................................................................................. 15

3.2 Symbols ............................................................................................................................................................ 15

3.3 Abbreviations ................................................................................................................................................... 15

4 General architecture of VDL Mode 2 ..................................................................................................... 17

5 Link layer protocols and services functional specifications ................................................................... 18

5.0 Overview .......................................................................................................................................................... 18

5.1 MAC sublayer specifications ........................................................................................................................... 19

5.1.0 MAC General Requirements....................................................................................................................... 19

5.1.1 MAC services ............................................................................................................................................. 19

5.1.1.1 Multiple access ...................................................................................................................................... 19

5.1.1.2 Channel congestion ............................................................................................................................... 19

5.1.2 MAC service system parameters ................................................................................................................ 20

5.1.2.0 General Requirements ........................................................................................................................... 20

5.1.2.1 Timer TM1 (inter-access delay timer)................................................................................................... 20

5.1.2.2 Timer TM2 (channel busy timer) .......................................................................................................... 20

5.1.2.3 Parameter p (persistence) ...................................................................................................................... 20

5.1.2.4 Counter M1 (maximum number of access attempts) ............................................................................ 20

5.1.3 Description of procedures ........................................................................................................................... 20

5.1.3.1 Channel sensing .................................................................................................................................... 20

5.1.3.2 P-persistent CSMA access times ........................................................................................................... 20

5.1.3.3 Inter-access interval .............................................................................................................................. 21

5.1.3.4 Channel access procedure ..................................................................................................................... 21

5.1.3.4.1 Purpose ............................................................................................................................................ 21

5.1.3.4.2 Use ................................................................................................................................................... 21

5.1.3.4.3 Procedure ......................................................................................................................................... 21

5.1.3.5 AVLC frame reception .......................................................................................................................... 21

5.1.3.5.1 Purpose ............................................................................................................................................ 21

5.1.3.5.2 Use ................................................................................................................................................... 21

5.1.3.5.3 Procedure ......................................................................................................................................... 21

5.2 Data link layer service protocol specifications ................................................................................................. 22

5.2.1 Interface with MAC sub layer..................................................................................................................... 22

5.2.1.0 General considerations .......................................................................................................................... 22

5.2.1.1 Sequence of primitives .......................................................................................................................... 22

5.2.2 Data Link State Machines ........................................................................................................................... 23

5.2.2.0 Introduction ........................................................................................................................................... 23

5.2.2.1 LME state machine ............................................................................................................................... 24

5.2.2.2 DLE top state machine .......................................................................................................................... 25

5.2.2.3 DLE data transfer state diagram ............................................................................................................ 25

5.2.2.4 DLE selective reject state machines ...................................................................................................... 26

5.2.2.4.1 SRM mode Sending SREJ ............................................................................................................... 26

5.2.2.4.2 SRM mode Receiving SREJ ............................................................................................................ 27

ETSI
---------------------- Page: 3 ----------------------
4 Draft ETSI EN 301 841-2 V1.2.0 (2019-02)

5.2.2.4.3 FRM mode ....................................................................................................................................... 28

5.2.2.5 DLE termination state machine ............................................................................................................. 28

5.2.3 Services ....................................................................................................................................................... 29

5.2.3.1 Received frame sequencing procedure .................................................................................................. 29

5.2.3.1.0 General requirements ....................................................................................................................... 29

5.2.3.1.1 Purpose ............................................................................................................................................ 29

5.2.3.1.2 Use ................................................................................................................................................... 29

5.2.3.1.3 Procedure ......................................................................................................................................... 29

5.2.3.2 Error detection procedure ...................................................................................................................... 29

5.2.3.2.1 Purpose ............................................................................................................................................ 29

5.2.3.2.2 Use ................................................................................................................................................... 29

5.2.3.2.3 Procedure ......................................................................................................................................... 30

5.2.3.3 Station identification ............................................................................................................................. 30

5.2.3.4 Broadcast addressing ............................................................................................................................. 30

5.2.3.5 Data transfer .......................................................................................................................................... 30

5.2.4 Frame format .............................................................................................................................................. 30

5.2.4.0 General .................................................................................................................................................. 30

5.2.4.1 Address structure ................................................................................................................................... 30

5.2.4.2 Address fields ........................................................................................................................................ 31

5.2.4.2.0 General requirements ....................................................................................................................... 31

5.2.4.2.1 Air-ground status bit ........................................................................................................................ 31

5.2.4.2.2 Command/response status bit .......................................................................................................... 31

5.2.4.2.3 Data link service addresses .............................................................................................................. 31

5.2.4.2.4 Address type .................................................................................................................................... 31

5.2.4.2.5 Aircraft specific addresses ............................................................................................................... 31

5.2.4.2.6 ICAO-administered ground station specific addresses .................................................................... 31

5.2.4.2.7 ICAO-delegated ground station specific addresses ......................................................................... 32

5.2.4.3 Broadcast address .................................................................................................................................. 32

5.2.4.3.0 General Requirements ..................................................................................................................... 32

5.2.4.3.1 Encoding .......................................................................................................................................... 32

5.2.4.4 Link control field .................................................................................................................................. 32

5.2.4.5 Information field ................................................................................................................................... 32

5.2.5 Transmit queues management..................................................................................................................... 33

5.2.6 Data link service system parameters ........................................................................................................... 33

5.2.6.0 General requirements ............................................................................................................................ 33

5.2.6.1 Parameter T1 (delay before non acknowledged retransmission) ........................................................... 34

5.2.6.2 Parameter T2 (delay before acknowledgment)...................................................................................... 34

5.2.6.3 Parameter T3 (link initialization time) .................................................................................................. 34

5.2.6.4 Parameter T4 (maximum delay between transmissions) ....................................................................... 34

5.2.6.4.0 General requirements ....................................................................................................................... 34

5.2.6.4.1 Recommendation ............................................................................................................................. 34

5.2.6.5 Parameter N1 (maximum number of bits of any frame) ....................................................................... 35

5.2.6.6 Counter N2 (maximum number of transmissions) ................................................................................ 35

5.2.6.7 Parameter k (window size) .................................................................................................................... 35

5.2.6.8 Parameter G (Maximum number of frames in a burst) ......................................................................... 35

5.2.7 DLE retransmission timers ......................................................................................................................... 35

5.2.8 Description of procedures ........................................................................................................................... 35

5.2.8.0 General Requirements ........................................................................................................................... 35

5.2.8.1 Procedure retransmission schedule ....................................................................................................... 35

5.2.8.1.1 Purpose ............................................................................................................................................ 35

5.2.8.1.2 Use ................................................................................................................................................... 35

5.2.8.1.3 Procedure ......................................................................................................................................... 36

5.2.8.2 Procedure frame retransmission ............................................................................................................ 36

5.2.8.2.1 Purpose ............................................................................................................................................ 36

5.2.8.2.2 Use ................................................................................................................................................... 36

5.2.8.2.3 Procedure ......................................................................................................................................... 36

5.2.8.3 Procedure XID frame retransmission .................................................................................................... 36

5.2.8.3.1 Purpose ............................................................................................................................................ 36

5.2.8.3.2 Use ................................................................................................................................................... 36

5.2.8.3.3 Procedure ......................................................................................................................................... 36

5.2.8.4 Procedure link monitoring ..................................................................................................................... 36

5.2.8.4.1 Purpose ............................................................................................................................................ 36

ETSI
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5 Draft ETSI EN 301 841-2 V1.2.0 (2019-02)

5.2.8.4.2 Use ................................................................................................................................................... 36

5.2.8.4.3 Procedure ......................................................................................................................................... 37

5.2.8.5 Procedure link recovery ........................................................................................................................ 37

5.2.8.5.1 Purpose ............................................................................................................................................ 37

5.2.8.5.2 Use ................................................................................................................................................... 37

5.2.8.5.3 Procedure ......................................................................................................................................... 37

5.2.9 Modes of operation to be supported ............................................................................................................ 37

5.2.9.1 Operational mode .................................................................................................................................. 37

5.2.9.2 Non-operational mode ........................................................................................................................... 37

5.2.9.2.0 General ............................................................................................................................................ 37

5.2.9.2.1 DISC frame ...................................................................................................................................... 37

5.2.9.2.2 DM frame ........................................................................................................................................ 37

5.2.9.3 Frame reject mode ................................................................................................................................. 38

5.2.9.4 Sent selective reject mode ..................................................................................................................... 38

5.2.10 Use of the P/F bit ........................................................................................................................................ 38

5.2.10.1 General .................................................................................................................................................. 38

5.2.10.2 INFO frames ......................................................................................................................................... 38

5.2.10.3 Recommendation .................................................................................................................................. 38

5.2.10.4 Unnumbered frames .............................................................................................................................. 38

5.2.11 Unnumbered command frame collisions .................................................................................................... 38

5.2.11.0 General Requirements ........................................................................................................................... 38

5.2.11.1 DLE procedures .................................................................................................................................... 38

5.2.11.2 LME procedures .................................................................................................................................... 39

5.2.12 XID frame ................................................................................................................................................... 39

5.2.13 Broadcast .................................................................................................................................................... 39

5.2.14 Information transfer .................................................................................................................................... 39

5.2.14.1 General Requirements and Recommendation ....................................................................................... 39

5.2.14.1.0 Procedures for information transfer ................................................................................................. 39

5.2.14.1.1 Eliminate redundant frames ............................................................................................................. 39

5.2.14.1.2 Recommendation ............................................................................................................................. 39

5.2.14.1.3 Recommendation ............................................................................................................................. 39

5.2.14.1.4 Recommendation ............................................................................................................................. 39

5.2.14.1.5 Procedures for transmission ............................................................................................................. 39

5.2.14.1.6 Recommendation ............................................................................................................................. 39

5.2.14.1.7 Recommendation ............................................................................................................................. 40

5.2.14.1.8 Recommendation ............................................................................................................................. 40

5.2.14.2 SREJ frame ........................................................................................................................................... 40

5.2.14.3 FRMR frame ......................................................................................................................................... 40

5.2.14.4 UA frame .............................................................................................................................................. 40

5.2.14.5 UI frame ................................................................................................................................................ 40

5.2.14.6 TEST frame ........................................................................................................................................... 40

5.3 VDL management entity .................................................................................................................................. 41

5.3.1 Services ....................................................................................................................................................... 41

5.3.1.1 Link provision ....................................................................................................................................... 41

5.3.1.2 Link change notifications ...................................................................................................................... 41

5.3.2 Exchange identity (XID) parameter ............................................................................................................ 41

5.3.2.0 Overview ............................................................................................................................................... 41

5.3.2.1 Encoding ............................................................................................................................................... 41

5.3.2.2 Public parameters .................................................................................................................................. 41

5.3.2.2.0 General requirements ....................................................................................................................... 41

5.3.2.2.1 HDLC public parameter set identifier ............................................................................................. 42

5.3.2.2.2 Timer T1 parameter ......................................................................................................................... 42

5.3.2.3 VDL private parameters ........................................................................................................................ 42

5.3.2.4 General purpose information private parameters .................................................................................. 43

5.3.2.4.0 General requirements ....................................................................................................................... 43

5.3.2.4.1 VDL private parameter set identifier ............................................................................................... 43

5.3.2.4.2 Connection management parameter ................................................................................................ 43

5.3.2.4.3 Signal Quality Parameter (SQP) ....................
...

SLOVENSKI STANDARD
SIST EN 301 841-2 V1.2.1:2019
01-september-2019
Digitalne povezave VHF zrak-tla, 2. način - Tehnične karakteristike in merilne
metode za talno opremo - 2. del: Zgornje plasti

VHF air-ground Digital Link (VDL) Mode 2 - Technical characteristics and methods of

measurement for ground-based equipment - Part 2: Upper layers
Ta slovenski standard je istoveten z: ETSI EN 301 841-2 V1.2.1 (2019-05)
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
SIST EN 301 841-2 V1.2.1:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 301 841-2 V1.2.1:2019
---------------------- Page: 2 ----------------------
SIST EN 301 841-2 V1.2.1:2019
ETSI EN 301 841-2 V1.2.1 (2019-05)
EUROPEAN STANDARD
VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and
methods of measurement
for ground-based equipment;
Part 2: Upper layers
---------------------- Page: 3 ----------------------
SIST EN 301 841-2 V1.2.1:2019
2 ETSI EN 301 841-2 V1.2.1 (2019-05)
Reference
REN/ERM-TGAERO-56
Keywords
aeronautical, radio, testing
ETSI
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ETSI
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SIST EN 301 841-2 V1.2.1:2019
3 ETSI EN 301 841-2 V1.2.1 (2019-05)
Contents

Intellectual Property Rights .............................................................................................................................. 11

Foreword ........................................................................................................................................................... 11

Modal verbs terminology .................................................................................................................................. 11

Introduction ...................................................................................................................................................... 12

1 Scope ...................................................................................................................................................... 13

2 References .............................................................................................................................................. 13

2.1 Normative references ....................................................................................................................................... 13

2.2 Informative references ...................................................................................................................................... 14

3 Definition of terms, symbols and abbreviations ..................................................................................... 14

3.1 Terms ................................................................................................................................................................ 14

3.1.1 Basic reference model terms ....................................................................................................................... 14

3.1.2 Service conventions terms .......................................................................................................................... 15

3.1.3 General terms .............................................................................................................................................. 15

3.2 Symbols ............................................................................................................................................................ 15

3.3 Abbreviations ................................................................................................................................................... 15

4 General architecture of VDL Mode 2 ..................................................................................................... 17

5 Link layer protocols and services functional specifications ................................................................... 18

5.0 Overview .......................................................................................................................................................... 18

5.1 MAC sublayer specifications ........................................................................................................................... 19

5.1.0 MAC General Requirements....................................................................................................................... 19

5.1.1 MAC services ............................................................................................................................................. 19

5.1.1.1 Multiple access ...................................................................................................................................... 19

5.1.1.2 Channel congestion ............................................................................................................................... 19

5.1.2 MAC service system parameters ................................................................................................................ 20

5.1.2.0 General Requirements ........................................................................................................................... 20

5.1.2.1 Timer TM1 (inter-access delay timer)................................................................................................... 20

5.1.2.2 Timer TM2 (channel busy timer) .......................................................................................................... 20

5.1.2.3 Parameter p (persistence) ...................................................................................................................... 20

5.1.2.4 Counter M1 (maximum number of access attempts) ............................................................................ 20

5.1.3 Description of procedures ........................................................................................................................... 20

5.1.3.1 Channel sensing .................................................................................................................................... 20

5.1.3.2 P-persistent CSMA access times ........................................................................................................... 20

5.1.3.3 Inter-access interval .............................................................................................................................. 21

5.1.3.4 Channel access procedure ..................................................................................................................... 21

5.1.3.4.1 Purpose ............................................................................................................................................ 21

5.1.3.4.2 Use ................................................................................................................................................... 21

5.1.3.4.3 Procedure ......................................................................................................................................... 21

5.1.3.5 AVLC frame reception .......................................................................................................................... 21

5.1.3.5.1 Purpose ............................................................................................................................................ 21

5.1.3.5.2 Use ................................................................................................................................................... 21

5.1.3.5.3 Procedure ......................................................................................................................................... 21

5.2 Data link layer service protocol specifications ................................................................................................. 22

5.2.1 Interface with MAC sub layer..................................................................................................................... 22

5.2.1.0 General considerations .......................................................................................................................... 22

5.2.1.1 Sequence of primitives .......................................................................................................................... 22

5.2.2 Data Link State Machines ........................................................................................................................... 23

5.2.2.0 Introduction ........................................................................................................................................... 23

5.2.2.1 LME state machine ............................................................................................................................... 24

5.2.2.2 DLE top state machine .......................................................................................................................... 25

5.2.2.3 DLE data transfer state diagram ............................................................................................................ 25

5.2.2.4 DLE selective reject state machines ...................................................................................................... 26

5.2.2.4.1 SRM mode Sending SREJ ............................................................................................................... 26

5.2.2.4.2 SRM mode Receiving SREJ ............................................................................................................ 27

ETSI
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SIST EN 301 841-2 V1.2.1:2019
4 ETSI EN 301 841-2 V1.2.1 (2019-05)

5.2.2.4.3 FRM mode ....................................................................................................................................... 28

5.2.2.5 DLE termination state machine ............................................................................................................. 28

5.2.3 Services ....................................................................................................................................................... 29

5.2.3.1 Received frame sequencing procedure .................................................................................................. 29

5.2.3.1.0 General requirements ....................................................................................................................... 29

5.2.3.1.1 Purpose ............................................................................................................................................ 29

5.2.3.1.2 Use ................................................................................................................................................... 29

5.2.3.1.3 Procedure ......................................................................................................................................... 29

5.2.3.2 Error detection procedure ...................................................................................................................... 29

5.2.3.2.1 Purpose ............................................................................................................................................ 29

5.2.3.2.2 Use ................................................................................................................................................... 29

5.2.3.2.3 Procedure ......................................................................................................................................... 30

5.2.3.3 Station identification ............................................................................................................................. 30

5.2.3.4 Broadcast addressing ............................................................................................................................. 30

5.2.3.5 Data transfer .......................................................................................................................................... 30

5.2.4 Frame format .............................................................................................................................................. 30

5.2.4.0 General .................................................................................................................................................. 30

5.2.4.1 Address structure ................................................................................................................................... 30

5.2.4.2 Address fields ........................................................................................................................................ 31

5.2.4.2.0 General requirements ....................................................................................................................... 31

5.2.4.2.1 Air-ground status bit ........................................................................................................................ 31

5.2.4.2.2 Command/response status bit .......................................................................................................... 31

5.2.4.2.3 Data link service addresses .............................................................................................................. 31

5.2.4.2.4 Address type .................................................................................................................................... 31

5.2.4.2.5 Aircraft specific addresses ............................................................................................................... 31

5.2.4.2.6 ICAO-administered ground station specific addresses .................................................................... 31

5.2.4.2.7 ICAO-delegated ground station specific addresses ......................................................................... 32

5.2.4.3 Broadcast address .................................................................................................................................. 32

5.2.4.3.0 General Requirements ..................................................................................................................... 32

5.2.4.3.1 Encoding .......................................................................................................................................... 32

5.2.4.4 Link control field .................................................................................................................................. 32

5.2.4.5 Information field ................................................................................................................................... 32

5.2.5 Transmit queues management..................................................................................................................... 33

5.2.6 Data link service system parameters ........................................................................................................... 33

5.2.6.0 General requirements ............................................................................................................................ 33

5.2.6.1 Parameter T1 (delay before non acknowledged retransmission) ........................................................... 34

5.2.6.2 Parameter T2 (delay before acknowledgment)...................................................................................... 34

5.2.6.3 Parameter T3 (link initialization time) .................................................................................................. 34

5.2.6.4 Parameter T4 (maximum delay between transmissions) ....................................................................... 34

5.2.6.4.0 General requirements ....................................................................................................................... 34

5.2.6.4.1 Recommendation ............................................................................................................................. 34

5.2.6.5 Parameter N1 (maximum number of bits of any frame) ....................................................................... 35

5.2.6.6 Counter N2 (maximum number of transmissions) ................................................................................ 35

5.2.6.7 Parameter k (window size) .................................................................................................................... 35

5.2.6.8 Parameter G (Maximum number of frames in a burst) ......................................................................... 35

5.2.7 DLE retransmission timers ......................................................................................................................... 35

5.2.8 Description of procedures ........................................................................................................................... 35

5.2.8.0 General Requirements ........................................................................................................................... 35

5.2.8.1 Procedure retransmission schedule ....................................................................................................... 35

5.2.8.1.1 Purpose ............................................................................................................................................ 35

5.2.8.1.2 Use ................................................................................................................................................... 35

5.2.8.1.3 Procedure ......................................................................................................................................... 36

5.2.8.2 Procedure frame retransmission ............................................................................................................ 36

5.2.8.2.1 Purpose ............................................................................................................................................ 36

5.2.8.2.2 Use ................................................................................................................................................... 36

5.2.8.2.3 Procedure ......................................................................................................................................... 36

5.2.8.3 Procedure XID frame retransmission .................................................................................................... 36

5.2.8.3.1 Purpose ............................................................................................................................................ 36

5.2.8.3.2 Use ................................................................................................................................................... 36

5.2.8.3.3 Procedure ......................................................................................................................................... 36

5.2.8.4 Procedure link monitoring ..................................................................................................................... 36

5.2.8.4.1 Purpose ............................................................................................................................................ 36

ETSI
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SIST EN 301 841-2 V1.2.1:2019
5 ETSI EN 301 841-2 V1.2.1 (2019-05)

5.2.8.4.2 Use ................................................................................................................................................... 36

5.2.8.4.3 Procedure ......................................................................................................................................... 37

5.2.8.5 Procedure link recovery ........................................................................................................................ 37

5.2.8.5.1 Purpose ............................................................................................................................................ 37

5.2.8.5.2 Use ................................................................................................................................................... 37

5.2.8.5.3 Procedure ......................................................................................................................................... 37

5.2.9 Modes of operation to be supported ............................................................................................................ 37

5.2.9.1 Operational mode .................................................................................................................................. 37

5.2.9.2 Non-operational mode ........................................................................................................................... 37

5.2.9.2.0 General ............................................................................................................................................ 37

5.2.9.2.1 DISC frame ...................................................................................................................................... 37

5.2.9.2.2 DM frame ........................................................................................................................................ 37

5.2.9.3 Frame reject mode ................................................................................................................................. 38

5.2.9.4 Sent selective reject mode ..................................................................................................................... 38

5.2.10 Use of the P/F bit ........................................................................................................................................ 38

5.2.10.1 General .................................................................................................................................................. 38

5.2.10.2 INFO frames ......................................................................................................................................... 38

5.2.10.3 Recommendation .................................................................................................................................. 38

5.2.10.4 Unnumbered frames .............................................................................................................................. 38

5.2.11 Unnumbered command frame collisions .................................................................................................... 38

5.2.11.0 General Requirements ........................................................................................................................... 38

5.2.11.1 DLE procedures .................................................................................................................................... 38

5.2.11.2 LME procedures .................................................................................................................................... 39

5.2.12 XID frame ................................................................................................................................................... 39

5.2.13 Broadcast .................................................................................................................................................... 39

5.2.14 Information transfer .................................................................................................................................... 39

5.2.14.1 General Requirements and Recommendation ....................................................................................... 39

5.2.14.1.0 Procedures for information transfer ................................................................................................. 39

5.2.14.1.1 Eliminate redundant frames ............................................................................................................. 39

5.2.14.1.2 Recommendation ............................................................................................................................. 39

5.2.14.1.3 Recommendation ............................................................................................................................. 39

5.2.14.1.4 Recommendation ............................................................................................................................. 39

5.2.14.1.5 Procedures for transmission ............................................................................................................. 39

5.2.14.1.6 Recommendation ............................................................................................................................. 39

5.2.14.1.7 Recommendation ............................................................................................................................. 40

5.2.14.1.8 Recommendation ............................................................................................................................. 40

5.2.14.2 SREJ frame ........................................................................................................................................... 40

5.2.14.3 FRMR frame ......................................................................................................................................... 40

5.2.14.4 UA frame .............................................................................................................................................. 40

5.2.14.5 UI frame ................................................................................................................................................ 40

5.2.14.6 TEST frame ........................................................................................................................................... 40

5.3 VDL management entity .................................................................................................................................. 41

5.3.1 Services ....................................................................................................................................................... 41

5.3.1.1 Link provision ....................................................................................................................................... 41

5.3.1.2 Link change notifications ...................................................................................................................... 41

5.3.2 Exchange identity (XID) parameter ............................................................................................................ 41

5.3.2.0 Overview ............................................................................................................................................... 41

5.3.2.1 Encoding ............................................................................................................................................... 41

5.3.2.2 Public parameters .................................................................................................................................. 41

5.3.2.2.0 General requirements ....................................................................................................................... 41

5.3.2.2.1 HDLC public parameter set identifier ............................................................................................. 42

5.3.2.2.2 Timer T1
...

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