Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 4: Data Link Control (DLC) layer

The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications
(DECT) Common Interface (CI).
The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard
and layer 2b of the DECT protocol stack.
Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and
the User plane (U-plane).
The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that
uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also
provides a separate point-to-multipoint (broadcast) service (Lb).
The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent
procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of
independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed
characteristics of those links are determined by the particular needs of each service. The defined services cover a wide
range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable
delay", for local area network applications.
NOTE: The performance of the DLC services need not be tight to any particular application. For example the
"unprotected with low delay" service could also be used for data applications, e.g. if some data protection
is provided outside the DECT protocol.
The present document uses the layered model principles and terminology as described in Recommendations ITU-T
X.200 [14] and X.210 [15].
The present document includes New Generation DECT, a further development of the DECT standard introducing
wideband speech, improved data services, new slot types and other technical enhancements.

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 4. del: Plast krmiljenja podatkovnih povezav (DLC)

Ta dokument je eden od delov specifikacije skupnega vmesnika (CI) za digitalne izboljšane brezvrvične telekomunikacije (DECT).
Ta dokument določa plast krmiljenja podatkovnih povezav (DLC). Plast krmiljenja podatkovnih povezav je 4. del standarda za skupni vmesnik za digitalne izboljšane brezvrvične telekomunikacije, plast 2b pa sklada protokolov digitalnih izboljšanih brezvrvičnih telekomunikacij.
Za to (pod)plast krmiljenja podatkovnih povezav sta določeni dve ravni delovanja. Imenujeta se nadzorna raven (C-raven) in uporabniška raven (U-raven).
C-raven obravnava zlasti vidike signalizacije digitalnih izboljšanih brezvrvičnih telekomunikacij. Zagotavlja zanesljivo storitev točka-točka, ki s protokolom LAP omogoča prenos sporočil omrežne plasti (NWK), zaščiten pred napakami. Poleg tega C-raven zagotavlja ločeno storitev (oddajanja) točka-več točk (Lb).
U-raven obravnava le uporabniške informacije od sprejema do vročitve. Ta raven vključuje večino postopkov digitalnih izboljšanih brezvrvičnih telekomunikacij, ki so odvisni od uporabe. Več nadomestnih storitev (način z vodi in način s paketi) je obravnavanih kot skupina neodvisnih entitet. Vsaka storitev zagotavlja eno ali več podatkovnih povezav U-ravni točka-točka, pri čemer podrobne lastnosti teh povezav določajo zadevne potrebe posamezne storitve. Določene storitve zajemajo širok nabor delovanja, od »nezaščitene z nizko stopnjo zakasnitve« pri govorni uporabi do »visoko zaščitene s spremenljivo zakasnitvijo« pri uporabi z lokalnim omrežjem.
OPOMBA: Delovanje krmiljenja podatkovnih povezav ni nujno vezano na neko določeno uporabo. Primer: storitev »nezaščitena z nizko stopnjo zakasnitve« se lahko uporablja tudi za podatkovne uporabe, npr. pri zagotavljanju zaščite podatkov zunaj protokola digitalnih izboljšanih brezvrvičnih telekomunikacij.
Ta dokument uporablja načela in terminologijo modela plasti, kot je opisano v priporočilih ITU-T X.200 [14] in X.210 [15].
Ta dokument vključuje novo generacijo digitalnih izboljšanih brezvrvičnih telekomunikacij, nadaljnji razvoj standarda o digitalnih izboljšanih brezvrvičnih telekomunikacijah, ki uvaja širokopasovni govor, izpopolnjene podatkovne storitve, nove tipe rež in druge tehnične izpopolnitve.

General Information

Status
Published
Public Enquiry End Date
22-Mar-2022
Publication Date
05-Apr-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Apr-2022
Due Date
09-Jun-2022
Completion Date
06-Apr-2022

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ETSI EN 300 175-4 V2.9.1 (2022-03)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
---------------------- Page: 1 ----------------------
2 ETSI EN 300 175-4 V2.9.1 (2022-03)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
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 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
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

If you find a security vulnerability in the present document, please report it through our

Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability

The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of

experience to understand and interpret its content in accordance with generally accepted engineering or

other professional standard and applicable regulations.

No recommendation as to products and services or vendors is made or should be implied.

In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not

limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property

rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages

for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use

of or inability to use the software.
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 2022.
All rights reserved.
ETSI
---------------------- Page: 2 ----------------------
3 ETSI EN 300 175-4 V2.9.1 (2022-03)
Contents

Intellectual Property Rights .............................................................................................................................. 13

Foreword ........................................................................................................................................................... 13

Modal verbs terminology .................................................................................................................................. 13

1 Scope ...................................................................................................................................................... 14

2 References .............................................................................................................................................. 14

2.1 Normative references ....................................................................................................................................... 14

2.2 Informative references ...................................................................................................................................... 15

3 Definition of terms, symbols and abbreviations ..................................................................................... 16

3.1 Terms ................................................................................................................................................................ 16

3.2 Symbols ............................................................................................................................................................ 16

3.3 Abbreviations ................................................................................................................................................... 17

4 Data Link Control (DLC) layer overview .............................................................................................. 19

4.1 General ............................................................................................................................................................. 19

4.2 C-plane services ............................................................................................................................................... 20

4.3 U-plane services ............................................................................................................................................... 21

4.4 Lower Layer Management Entity (LLME) ...................................................................................................... 24

4.5 Instantiation in DLC U-plane ........................................................................................................................... 24

5 C-plane service characteristics ............................................................................................................... 24

5.1 Data link service (LAPC+Lc) ........................................................................................................................... 24

5.1.1 General ........................................................................................................................................................ 24

5.1.2 LAPC types of operation ............................................................................................................................ 25

5.1.3 Establishment of information transfer modes ............................................................................................. 25

5.1.3.1 Data Link Identifier (DLI) .................................................................................................................... 25

5.1.3.2 LAPC states........................................................................................................................................... 26

5.2 Broadcast service (Lb) ...................................................................................................................................... 26

6 Frame structures for C-plane services .................................................................................................... 27

6.1 Data link service frame structure ...................................................................................................................... 27

6.1.0 Frame format type FA................................................................................................................................. 27

6.1.1 General frame structure .............................................................................................................................. 27

6.1.2 Lc frame delimiting and transparency ........................................................................................................ 28

6.1.3 Transmission order ..................................................................................................................................... 28

6.1.4 Routing to logical channels ......................................................................................................................... 28

6.1.4.0 General .................................................................................................................................................. 28

6.1.4.1 CF/CLF logical channel .......................................................................................................................... 29

6.1.4.2 C /CL logical channel .......................................................................................................................... 29

S S

6.1.5 Invalid frames ............................................................................................................................................. 29

6.2 Broadcast service frame structure..................................................................................................................... 30

6.2.1 Standard frame structure ............................................................................................................................. 30

6.2.2 Extended frame structure ............................................................................................................................ 30

7 Elements of procedures and formats of fields for C-plane peer-to-peer communication ....................... 31

7.1 General ............................................................................................................................................................. 31

7.2 Address field formats ....................................................................................................................................... 31

7.3 Address field parameters .................................................................................................................................. 31

7.3.1 REServed bit (RES) .................................................................................................................................... 31

7.3.2 Command Response (C/R) bit .................................................................................................................... 31

7.3.3 SAPI field ................................................................................................................................................... 31

7.3.4 New Link Flag (NLF) bit ............................................................................................................................ 32

7.3.5 LLN-field .................................................................................................................................................... 32

7.3.6 Data Link Identifiers (DLI) ......................................................................................................................... 32

7.4 Control field formats ........................................................................................................................................ 33

7.5 Control field parameters ................................................................................................................................... 33

7.5.1 Poll/Final (P/F) bit ...................................................................................................................................... 33

ETSI
---------------------- Page: 3 ----------------------
4 ETSI EN 300 175-4 V2.9.1 (2022-03)

7.5.2 Multiple frame operation variables and sequence numbers ........................................................................ 33

7.5.2.1 Modulus ................................................................................................................................................ 33

7.5.2.2 Send state Variable V(S) ....................................................................................................................... 34

7.5.2.3 Acknowledge state Variable V(A) ........................................................................................................ 34

7.5.2.4 Send sequence Number N(S) ................................................................................................................ 34

7.5.2.5 Receive state Variable V(R) .................................................................................................................. 34

7.5.2.6 Receive sequence Number N(R) ........................................................................................................... 34

7.5.3 Unacknowledged operation variables and sequence numbers .................................................................... 34

7.5.4 Supervisory and Unnumbered function bits S and U .................................................................................. 34

7.6 Length indicator field format............................................................................................................................ 34

7.7 Length indicator field parameters ..................................................................................................................... 35

7.7.1 Length indicator field extension bit (N) ...................................................................................................... 35

7.7.2 More data bit (M) ........................................................................................................................................ 35

7.7.3 Length parameter (L ) ................................................................................................................................. 35

7.7.4 Extended length parameter (L ) ................................................................................................................. 36

7.7.5 Reserved bit (RES) ..................................................................................................................................... 36

7.8 Fill field format ................................................................................................................................................ 36

7.9 Checksum field format ..................................................................................................................................... 36

7.10 Checksum field parameters .............................................................................................................................. 37

7.11 Commands and responses ................................................................................................................................ 38

7.11.0 General ........................................................................................................................................................ 38

7.11.1 Information (I) command ............................................................................................................................ 38

7.11.2 Receive Ready (RR) command/response .................................................................................................... 38

7.11.3 Receive Not Ready (RNR) command/response .......................................................................................... 39

7.11.4 REJect (REJ) command/response ............................................................................................................... 39

7.11.5 Set Asynchronous Balanced Mode (SABM) command .............................................................................. 39

7.11.6 Disconnect Mode (DM) response ............................................................................................................... 39

7.11.7 Unnumbered Information (UI) command ................................................................................................... 39

7.11.8 DISConnect (DISC) command ................................................................................................................... 40

7.11.9 Unnumbered ACK (UA) response .............................................................................................................. 40

8 Primitives ............................................................................................................................................... 40

8.1 Primitive types .................................................................................................................................................. 40

8.2 Primitives to the MAC layer (lower layer) ....................................................................................................... 40

8.3 Primitives to the NWK layer (higher layer) ..................................................................................................... 41

8.3.0 General ........................................................................................................................................................ 41

8.3.1 Parameter definitions .................................................................................................................................. 41

8.3.2 S-SAP primitives ........................................................................................................................................ 42

8.3.2.0 List of primitives ................................................................................................................................... 42

8.3.2.1 DL_ESTABLISH primitive .................................................................................................................. 42

8.3.2.2 DL_RELEASE primitive ...................................................................................................................... 43

8.3.2.3 DL_DATA primitive ............................................................................................................................. 43

8.3.2.4 DL_UNIT_DATA primitive ................................................................................................................. 43

8.3.2.5 DL_SUSPEND primitive ...................................................................................................................... 43

8.3.2.6 DL_RESUME primitive ........................................................................................................................ 44

8.3.2.7 DL_ENC_KEY primitive ...................................................................................................................... 44

8.3.2.8 DL_ENCRYPT primitive ...................................................................................................................... 44

8.3.2.9 DL_SERVICE_MOD primitive ............................................................................................................ 45

8.3.3 B-SAP primitives ........................................................................................................................................ 45

8.3.3.0 List of primitives ................................................................................................................................... 45

8.3.3.1 DL_BROADCAST primitive ................................................................................................................ 45

8.3.3.2 DL_EXPEDITED primitive .................................................................................................................. 45

8.4 Primitives to the interworking unit ................................................................................................................... 46

8.4.0 General ........................................................................................................................................................ 46

8.4.1 Parameter definitions .................................................................................................................................. 46

8.4.2 LUX-SAP primitives ................................................................................................................................... 46

8.4.2.0 List of primitives ................................................................................................................................... 46

8.4.2.1 DL_U_DATA primitive ........................................................................................................................ 46

8.4.2.2 DL_U_UNIT_DATA primitive ............................................................................................................ 47

8.4.2.3 DL_U_ERROR primitive ...................................................................................................................... 47

9 C-plane peer-to-peer procedures ............................................................................................................ 47

ETSI
---------------------- Page: 4 ----------------------
5 ETSI EN 300 175-4 V2.9.1 (2022-03)

9.1 General ............................................................................................................................................................. 47

9.2 Point-to-point acknowledged operation............................................................................................................ 48

9.2.1 Procedure for the use of the P/F bit ............................................................................................................ 48

9.2.1.1 Class A acknowledged information transfer ......................................................................................... 48

9.2.1.2 Class B acknowledged information transfer ......................................................................................... 48

9.2.2 Use of LLN ................................................................................................................................................. 48

9.2.2.1 Class A operation .................................................................................................................................. 48

9.2.2.2 Class B operation .................................................................................................................................. 48

9.2.3 Link establishment and information transfer in class A operation .............................................................. 49

9.2.3.1 Establishing class A operation .............................................................................................................. 49

9.2.3.2 Class A acknowledged information transfer ......................................................................................... 49

9.2.3.3 Transmission of class A I-frames .......................................................................................................... 50

9.2.3.4 Reception of class A I-frames ............................................................................................................... 50

9.2.3.5 Receiving acknowledgements ............................................................................................................... 50

9.2.3.6 Waiting for acknowledgement .............................................................................................................. 51

9.2.3.7 Release of class A operation ................................................................................................................. 51

9.2.3.8 Re-establishment of class A operation .................................................................................................. 51

9.2.4 Establishing class B multiple frame operation ............................................................................................ 52

9.2.4.1 Overview ............................................................................................................................................... 52

9.2.4.2 Class B multiple frame establishment procedures ................................................................................. 52

9.2.4.3 Class B LLN assignment procedures .................................................................................................... 53

9.2.4.3.0 General ............................................................................................................................................ 53

9.2.4.3.1 PT establishment ............................................................................................................................. 54

9.2.4.3.2 FT establishment ............................................................................................................................. 54

9.2.5 Link maintenance and information transfer in class B multiple frame operation ....................................... 54

9.2.5.0 General .................................................................................................................................................. 54

9.2.5.1 Transmitting I-frames............................................................................................................................ 55

9.2.5.2 Receiving I-frames ................................................................................................................................ 55

9.2.5.2.0 General ............................................................................................................................................ 55

9.2.5.2.1 P bit set to 1 ..................................................................................................................................... 55

9.2.5.2.2 P bit set to 0 ..................................................................................................................................... 55

9.2.5.3 Sending and receiving acknowledgements ............................................................................................ 56

9.2.5.3.1 Sending acknowledgements ............................................................................................................ 56

9.2.5.3.2 Receiving acknowledgements ......................................................................................................... 56

9.2.5.4 Receiving REJ-frames ........................................................................................................................... 56

9.2.5.5 Receiving RNR-frames ......................................................................................................................... 57

9.2.5.6 LAPC own receiver busy condition ...................................................................................................... 58

9.2.5.7 Waiting acknowledgement .................................................................................................................... 59

9.2.5.8 Appropriate supervisory frame.............................................................................................................. 59

9.2.6 Release of class B multiple frame operation ............................................................................................... 59

9.2.7 Link suspension and resumption ................................................................................................................. 60

9.2.7.1 Link suspension ..................................................................................................................................... 60

9.2.7.1.0 General ............................................................................................................................................ 60

9.2.7.1.1 Class B acknowledged suspend ....................................................................................................... 60

9.2.7.1.2 Unacknowledged suspend ............................................................................................................... 61

9.2.7.2 Class B link resumption ........................................................................................................................ 62

9.2.7.3 Connection handover ............................................................................................................................ 63

9.2.7.3.0 General ............................................................................................................................................ 63

9.2.7.3.1 Class A connection handover .......................................................................................................... 65

9.2.7.3.2 Class B connection handover .......................................................................................................... 65

9.2.7.3.3 Expiry of connection handover timer .............................................................................................. 66

9.2.8 Re-establishment of class B multi-frame operation .................................................................................... 66

9.2.8.1 Criteria for re-establishment.................................................................................................................. 66

9.2.8.2 Procedure .............................................................................................................................................. 66

9.2.9 Exception handling ..................................................................................................................................... 67

9.2.9.1 General .................................................................................................................................................. 67

9.2.9.2 Class B exception condit
...

SLOVENSKI STANDARD
SIST EN 300 175-4 V2.9.1:2022
01-maj-2022

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 4.

del: Plast krmiljenja podatkovnih povezav (DLC)

Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part

4: Data Link Control (DLC) layer
Ta slovenski standard je istoveten z: ETSI EN 300 175-4 V2.9.1 (2022-03)
ICS:
33.070.30 Digitalne izboljšane Digital Enhanced Cordless
brezvrvične telekomunikacije Telecommunications (DECT)
(DECT)
35.100.20 Podatkovni povezovalni sloj Data link layer
SIST EN 300 175-4 V2.9.1:2022 en

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

---------------------- Page: 1 ----------------------
SIST EN 300 175-4 V2.9.1:2022
---------------------- Page: 2 ----------------------
SIST EN 300 175-4 V2.9.1:2022
ETSI EN 300 175-4 V2.9.1 (2022-03)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
---------------------- Page: 3 ----------------------
SIST EN 300 175-4 V2.9.1:2022
2 ETSI EN 300 175-4 V2.9.1 (2022-03)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
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 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
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

If you find a security vulnerability in the present document, please report it through our

Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability

The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of

experience to understand and interpret its content in accordance with generally accepted engineering or

other professional standard and applicable regulations.

No recommendation as to products and services or vendors is made or should be implied.

In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not

limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property

rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages

for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use

of or inability to use the software.
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 2022.
All rights reserved.
ETSI
---------------------- Page: 4 ----------------------
SIST EN 300 175-4 V2.9.1:2022
3 ETSI EN 300 175-4 V2.9.1 (2022-03)
Contents

Intellectual Property Rights .............................................................................................................................. 13

Foreword ........................................................................................................................................................... 13

Modal verbs terminology .................................................................................................................................. 13

1 Scope ...................................................................................................................................................... 14

2 References .............................................................................................................................................. 14

2.1 Normative references ....................................................................................................................................... 14

2.2 Informative references ...................................................................................................................................... 15

3 Definition of terms, symbols and abbreviations ..................................................................................... 16

3.1 Terms ................................................................................................................................................................ 16

3.2 Symbols ............................................................................................................................................................ 16

3.3 Abbreviations ................................................................................................................................................... 17

4 Data Link Control (DLC) layer overview .............................................................................................. 19

4.1 General ............................................................................................................................................................. 19

4.2 C-plane services ............................................................................................................................................... 20

4.3 U-plane services ............................................................................................................................................... 21

4.4 Lower Layer Management Entity (LLME) ...................................................................................................... 24

4.5 Instantiation in DLC U-plane ........................................................................................................................... 24

5 C-plane service characteristics ............................................................................................................... 24

5.1 Data link service (LAPC+Lc) ........................................................................................................................... 24

5.1.1 General ........................................................................................................................................................ 24

5.1.2 LAPC types of operation ............................................................................................................................ 25

5.1.3 Establishment of information transfer modes ............................................................................................. 25

5.1.3.1 Data Link Identifier (DLI) .................................................................................................................... 25

5.1.3.2 LAPC states........................................................................................................................................... 26

5.2 Broadcast service (Lb) ...................................................................................................................................... 26

6 Frame structures for C-plane services .................................................................................................... 27

6.1 Data link service frame structure ...................................................................................................................... 27

6.1.0 Frame format type FA................................................................................................................................. 27

6.1.1 General frame structure .............................................................................................................................. 27

6.1.2 Lc frame delimiting and transparency ........................................................................................................ 28

6.1.3 Transmission order ..................................................................................................................................... 28

6.1.4 Routing to logical channels ......................................................................................................................... 28

6.1.4.0 General .................................................................................................................................................. 28

6.1.4.1 CF/CLF logical channel .......................................................................................................................... 29

6.1.4.2 C /CL logical channel .......................................................................................................................... 29

S S

6.1.5 Invalid frames ............................................................................................................................................. 29

6.2 Broadcast service frame structure..................................................................................................................... 30

6.2.1 Standard frame structure ............................................................................................................................. 30

6.2.2 Extended frame structure ............................................................................................................................ 30

7 Elements of procedures and formats of fields for C-plane peer-to-peer communication ....................... 31

7.1 General ............................................................................................................................................................. 31

7.2 Address field formats ....................................................................................................................................... 31

7.3 Address field parameters .................................................................................................................................. 31

7.3.1 REServed bit (RES) .................................................................................................................................... 31

7.3.2 Command Response (C/R) bit .................................................................................................................... 31

7.3.3 SAPI field ................................................................................................................................................... 31

7.3.4 New Link Flag (NLF) bit ............................................................................................................................ 32

7.3.5 LLN-field .................................................................................................................................................... 32

7.3.6 Data Link Identifiers (DLI) ......................................................................................................................... 32

7.4 Control field formats ........................................................................................................................................ 33

7.5 Control field parameters ................................................................................................................................... 33

7.5.1 Poll/Final (P/F) bit ...................................................................................................................................... 33

ETSI
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SIST EN 300 175-4 V2.9.1:2022
4 ETSI EN 300 175-4 V2.9.1 (2022-03)

7.5.2 Multiple frame operation variables and sequence numbers ........................................................................ 33

7.5.2.1 Modulus ................................................................................................................................................ 33

7.5.2.2 Send state Variable V(S) ....................................................................................................................... 34

7.5.2.3 Acknowledge state Variable V(A) ........................................................................................................ 34

7.5.2.4 Send sequence Number N(S) ................................................................................................................ 34

7.5.2.5 Receive state Variable V(R) .................................................................................................................. 34

7.5.2.6 Receive sequence Number N(R) ........................................................................................................... 34

7.5.3 Unacknowledged operation variables and sequence numbers .................................................................... 34

7.5.4 Supervisory and Unnumbered function bits S and U .................................................................................. 34

7.6 Length indicator field format............................................................................................................................ 34

7.7 Length indicator field parameters ..................................................................................................................... 35

7.7.1 Length indicator field extension bit (N) ...................................................................................................... 35

7.7.2 More data bit (M) ........................................................................................................................................ 35

7.7.3 Length parameter (L ) ................................................................................................................................. 35

7.7.4 Extended length parameter (L ) ................................................................................................................. 36

7.7.5 Reserved bit (RES) ..................................................................................................................................... 36

7.8 Fill field format ................................................................................................................................................ 36

7.9 Checksum field format ..................................................................................................................................... 36

7.10 Checksum field parameters .............................................................................................................................. 37

7.11 Commands and responses ................................................................................................................................ 38

7.11.0 General ........................................................................................................................................................ 38

7.11.1 Information (I) command ............................................................................................................................ 38

7.11.2 Receive Ready (RR) command/response .................................................................................................... 38

7.11.3 Receive Not Ready (RNR) command/response .......................................................................................... 39

7.11.4 REJect (REJ) command/response ............................................................................................................... 39

7.11.5 Set Asynchronous Balanced Mode (SABM) command .............................................................................. 39

7.11.6 Disconnect Mode (DM) response ............................................................................................................... 39

7.11.7 Unnumbered Information (UI) command ................................................................................................... 39

7.11.8 DISConnect (DISC) command ................................................................................................................... 40

7.11.9 Unnumbered ACK (UA) response .............................................................................................................. 40

8 Primitives ............................................................................................................................................... 40

8.1 Primitive types .................................................................................................................................................. 40

8.2 Primitives to the MAC layer (lower layer) ....................................................................................................... 40

8.3 Primitives to the NWK layer (higher layer) ..................................................................................................... 41

8.3.0 General ........................................................................................................................................................ 41

8.3.1 Parameter definitions .................................................................................................................................. 41

8.3.2 S-SAP primitives ........................................................................................................................................ 42

8.3.2.0 List of primitives ................................................................................................................................... 42

8.3.2.1 DL_ESTABLISH primitive .................................................................................................................. 42

8.3.2.2 DL_RELEASE primitive ...................................................................................................................... 43

8.3.2.3 DL_DATA primitive ............................................................................................................................. 43

8.3.2.4 DL_UNIT_DATA primitive ................................................................................................................. 43

8.3.2.5 DL_SUSPEND primitive ...................................................................................................................... 43

8.3.2.6 DL_RESUME primitive ........................................................................................................................ 44

8.3.2.7 DL_ENC_KEY primitive ...................................................................................................................... 44

8.3.2.8 DL_ENCRYPT primitive ...................................................................................................................... 44

8.3.2.9 DL_SERVICE_MOD primitive ............................................................................................................ 45

8.3.3 B-SAP primitives ........................................................................................................................................ 45

8.3.3.0 List of primitives ................................................................................................................................... 45

8.3.3.1 DL_BROADCAST primitive ................................................................................................................ 45

8.3.3.2 DL_EXPEDITED primitive .................................................................................................................. 45

8.4 Primitives to the interworking unit ................................................................................................................... 46

8.4.0 General ........................................................................................................................................................ 46

8.4.1 Parameter definitions .................................................................................................................................. 46

8.4.2 LUX-SAP primitives ................................................................................................................................... 46

8.4.2.0 List of primitives ................................................................................................................................... 46

8.4.2.1 DL_U_DATA primitive ........................................................................................................................ 46

8.4.2.2 DL_U_UNIT_DATA primitive ............................................................................................................ 47

8.4.2.3 DL_U_ERROR primitive ...................................................................................................................... 47

9 C-plane peer-to-peer procedures ............................................................................................................ 47

ETSI
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SIST EN 300 175-4 V2.9.1:2022
5 ETSI EN 300 175-4 V2.9.1 (2022-03)

9.1 General ............................................................................................................................................................. 47

9.2 Point-to-point acknowledged operation............................................................................................................ 48

9.2.1 Procedure for the use of the P/F bit ............................................................................................................ 48

9.2.1.1 Class A acknowledged information transfer ......................................................................................... 48

9.2.1.2 Class B acknowledged information transfer ......................................................................................... 48

9.2.2 Use of LLN ................................................................................................................................................. 48

9.2.2.1 Class A operation .................................................................................................................................. 48

9.2.2.2 Class B operation .................................................................................................................................. 48

9.2.3 Link establishment and information transfer in class A operation .............................................................. 49

9.2.3.1 Establishing class A operation .............................................................................................................. 49

9.2.3.2 Class A acknowledged information transfer ......................................................................................... 49

9.2.3.3 Transmission of class A I-frames .......................................................................................................... 50

9.2.3.4 Reception of class A I-frames ............................................................................................................... 50

9.2.3.5 Receiving acknowledgements ............................................................................................................... 50

9.2.3.6 Waiting for acknowledgement .............................................................................................................. 51

9.2.3.7 Release of class A operation ................................................................................................................. 51

9.2.3.8 Re-establishment of class A operation .................................................................................................. 51

9.2.4 Establishing class B multiple frame operation ............................................................................................ 52

9.2.4.1 Overview ............................................................................................................................................... 52

9.2.4.2 Class B multiple frame establishment procedures ................................................................................. 52

9.2.4.3 Class B LLN assignment procedures .................................................................................................... 53

9.2.4.3.0 General ............................................................................................................................................ 53

9.2.4.3.1 PT establishment ............................................................................................................................. 54

9.2.4.3.2 FT establishment ............................................................................................................................. 54

9.2.5 Link maintenance and information transfer in class B multiple frame operation ....................................... 54

9.2.5.0 General .................................................................................................................................................. 54

9.2.5.1 Transmitting I-frames............................................................................................................................ 55

9.2.5.2 Receiving I-frames ................................................................................................................................ 55

9.2.5.2.0 General ............................................................................................................................................ 55

9.2.5.2.1 P bit set to 1 ..................................................................................................................................... 55

9.2.5.2.2 P bit set to 0 ..................................................................................................................................... 55

9.2.5.3 Sending and receiving acknowledgements ............................................................................................ 56

9.2.5.3.1 Sending acknowledgements ............................................................................................................ 56

9.2.5.3.2 Receiving acknowledgements ......................................................................................................... 56

9.2.5.4 Receiving REJ-frames ........................................................................................................................... 56

9.2.5.5 Receiving RNR-frames ......................................................................................................................... 57

9.2.5.6 LAPC own receiver busy condition ...................................................................................................... 58

9.2.5.7 Waiting acknowledgement .................................................................................................................... 59

9.2.5.8 Appropriate supervisory frame.............................................................................................................. 59

9.2.6 Release of class B multiple frame operation ............................................................................................... 59

9.2.7 Link suspension and resumption ................................................................................................................. 60

9.2.7.1 Link suspension ..................................................................................................................................... 60

9.2.7.1.0 General ............................................................................................................................................ 60

9.2.7.1.1 Class B acknowledged suspend ....................................................................................................... 60

9.2.7.1.2 Unacknowledged suspend ............................................................................................................... 61

9.2.7.2 Class B link resumption ........................................................................................................................ 62

9.2.7.3 Connection handover ............................................................................................................................ 63

9.2.7.3.0 General ............................................................................................................................................ 63

9.2.7.3.1 Class A connection handover .......................................................................................................... 65

9.2.7.3.2 Class B connection handover ...........................................................................

...

SLOVENSKI STANDARD
oSIST prEN 300 175-4 V2.8.5:2022
01-marec-2022

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 4.

del: Plast krmiljenja podatkovnih povezav (DLC)

Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part

4: Data Link Control (DLC) layer
Ta slovenski standard je istoveten z: ETSI EN 300 175-4 V2.8.5 (2021-12)
ICS:
33.070.30 Digitalne izboljšane Digital Enhanced Cordless
brezvrvične telekomunikacije Telecommunications (DECT)
(DECT)
35.100.20 Podatkovni povezovalni sloj Data link layer
oSIST prEN 300 175-4 V2.8.5:2022 en

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

---------------------- Page: 1 ----------------------
oSIST prEN 300 175-4 V2.8.5:2022
---------------------- Page: 2 ----------------------
oSIST prEN 300 175-4 V2.8.5:2022
ETSI EN 300 175-4 V2.8.5 (2021-12)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
---------------------- Page: 3 ----------------------
oSIST prEN 300 175-4 V2.8.5:2022
2 ETSI EN 300 175-4 V2.8.5 (2021-12)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
ETSI
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All rights reserved.
ETSI
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oSIST prEN 300 175-4 V2.8.5:2022
3 ETSI EN 300 175-4 V2.8.5 (2021-12)
Contents

Intellectual Property Rights .............................................................................................................................. 13

Foreword ........................................................................................................................................................... 13

Modal verbs terminology .................................................................................................................................. 13

1 Scope ...................................................................................................................................................... 14

2 References .............................................................................................................................................. 14

2.1 Normative references ....................................................................................................................................... 14

2.2 Informative references ...................................................................................................................................... 15

3 Definition of terms, symbols and abbreviations ..................................................................................... 16

3.1 Terms ................................................................................................................................................................ 16

3.2 Symbols ............................................................................................................................................................ 16

3.3 Abbreviations ................................................................................................................................................... 17

4 Data Link Control (DLC) layer overview .............................................................................................. 19

4.1 General ............................................................................................................................................................. 19

4.2 C-plane services ............................................................................................................................................... 20

4.3 U-plane services ............................................................................................................................................... 21

4.4 Lower Layer Management Entity (LLME) ...................................................................................................... 24

4.5 Instantiation in DLC U-plane ........................................................................................................................... 24

5 C-plane service characteristics ............................................................................................................... 24

5.1 Data link service (LAPC+Lc) ........................................................................................................................... 24

5.1.1 General ........................................................................................................................................................ 24

5.1.2 LAPC types of operation ............................................................................................................................ 25

5.1.3 Establishment of information transfer modes ............................................................................................. 25

5.1.3.1 Data Link Identifier (DLI) .................................................................................................................... 25

5.1.3.2 LAPC states........................................................................................................................................... 26

5.2 Broadcast service (Lb) ...................................................................................................................................... 26

6 Frame structures for C-plane services .................................................................................................... 27

6.1 Data link service frame structure ...................................................................................................................... 27

6.1.0 Frame format type FA................................................................................................................................. 27

6.1.1 General frame structure .............................................................................................................................. 27

6.1.2 Lc frame delimiting and transparency ........................................................................................................ 28

6.1.3 Transmission order ..................................................................................................................................... 28

6.1.4 Routing to logical channels ......................................................................................................................... 28

6.1.4.0 General .................................................................................................................................................. 28

6.1.4.1 C /CL logical channel .......................................................................................................................... 29

F F

6.1.4.2 C /CL logical channel .......................................................................................................................... 29

S S

6.1.5 Invalid frames ............................................................................................................................................. 29

6.2 Broadcast service frame structure..................................................................................................................... 30

6.2.1 Standard frame structure ............................................................................................................................. 30

6.2.2 Extended frame structure ............................................................................................................................ 30

7 Elements of procedures and formats of fields for C-plane peer-to-peer communication ....................... 31

7.1 General ............................................................................................................................................................. 31

7.2 Address field formats ....................................................................................................................................... 31

7.3 Address field parameters .................................................................................................................................. 31

7.3.1 REServed bit (RES) .................................................................................................................................... 31

7.3.2 Command Response (C/R) bit .................................................................................................................... 31

7.3.3 SAPI field ................................................................................................................................................... 31

7.3.4 New Link Flag (NLF) bit ............................................................................................................................ 32

7.3.5 LLN-field .................................................................................................................................................... 32

7.3.6 Data Link Identifiers (DLI) ......................................................................................................................... 32

7.4 Control field formats ........................................................................................................................................ 33

7.5 Control field parameters ................................................................................................................................... 33

7.5.1 Poll/Final (P/F) bit ...................................................................................................................................... 33

ETSI
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oSIST prEN 300 175-4 V2.8.5:2022
4 ETSI EN 300 175-4 V2.8.5 (2021-12)

7.5.2 Multiple frame operation variables and sequence numbers ........................................................................ 33

7.5.2.1 Modulus ................................................................................................................................................ 33

7.5.2.2 Send state Variable V(S) ....................................................................................................................... 34

7.5.2.3 Acknowledge state Variable V(A) ........................................................................................................ 34

7.5.2.4 Send sequence Number N(S) ................................................................................................................ 34

7.5.2.5 Receive state Variable V(R) .................................................................................................................. 34

7.5.2.6 Receive sequence Number N(R) ........................................................................................................... 34

7.5.3 Unacknowledged operation variables and sequence numbers .................................................................... 34

7.5.4 Supervisory and Unnumbered function bits S and U .................................................................................. 34

7.6 Length indicator field format............................................................................................................................ 34

7.7 Length indicator field parameters ..................................................................................................................... 35

7.7.1 Length indicator field extension bit (N) ...................................................................................................... 35

7.7.2 More data bit (M) ........................................................................................................................................ 35

7.7.3 Length parameter (L ) ................................................................................................................................. 35

7.7.4 Extended length parameter (L ) ................................................................................................................. 36

7.7.5 Reserved bit (RES) ..................................................................................................................................... 36

7.8 Fill field format ................................................................................................................................................ 36

7.9 Checksum field format ..................................................................................................................................... 36

7.10 Checksum field parameters .............................................................................................................................. 37

7.11 Commands and responses ................................................................................................................................ 38

7.11.0 General ........................................................................................................................................................ 38

7.11.1 Information (I) command ............................................................................................................................ 38

7.11.2 Receive Ready (RR) command/response .................................................................................................... 38

7.11.3 Receive Not Ready (RNR) command/response .......................................................................................... 39

7.11.4 REJect (REJ) command/response ............................................................................................................... 39

7.11.5 Set Asynchronous Balanced Mode (SABM) command .............................................................................. 39

7.11.6 Disconnect Mode (DM) response ............................................................................................................... 39

7.11.7 Unnumbered Information (UI) command ................................................................................................... 39

7.11.8 DISConnect (DISC) command ................................................................................................................... 40

7.11.9 Unnumbered ACK (UA) response .............................................................................................................. 40

8 Primitives ............................................................................................................................................... 40

8.1 Primitive types .................................................................................................................................................. 40

8.2 Primitives to the MAC layer (lower layer) ....................................................................................................... 40

8.3 Primitives to the NWK layer (higher layer) ..................................................................................................... 41

8.3.0 General ........................................................................................................................................................ 41

8.3.1 Parameter definitions .................................................................................................................................. 41

8.3.2 S-SAP primitives ........................................................................................................................................ 42

8.3.2.0 List of primitives ................................................................................................................................... 42

8.3.2.1 DL_ESTABLISH primitive .................................................................................................................. 42

8.3.2.2 DL_RELEASE primitive ...................................................................................................................... 43

8.3.2.3 DL_DATA primitive ............................................................................................................................. 43

8.3.2.4 DL_UNIT_DATA primitive ................................................................................................................. 43

8.3.2.5 DL_SUSPEND primitive ...................................................................................................................... 43

8.3.2.6 DL_RESUME primitive ........................................................................................................................ 44

8.3.2.7 DL_ENC_KEY primitive ...................................................................................................................... 44

8.3.2.8 DL_ENCRYPT primitive ...................................................................................................................... 44

8.3.2.9 DL_SERVICE_MOD primitive ............................................................................................................ 45

8.3.3 B-SAP primitives ........................................................................................................................................ 45

8.3.3.0 List of primitives ................................................................................................................................... 45

8.3.3.1 DL_BROADCAST primitive ................................................................................................................ 45

8.3.3.2 DL_EXPEDITED primitive .................................................................................................................. 45

8.4 Primitives to the interworking unit ................................................................................................................... 46

8.4.0 General ........................................................................................................................................................ 46

8.4.1 Parameter definitions .................................................................................................................................. 46

8.4.2 LU -SAP primitives ................................................................................................................................... 46

8.4.2.0 List of primitives ................................................................................................................................... 46

8.4.2.1 DL_U_DATA primitive ........................................................................................................................ 46

8.4.2.2 DL_U_UNIT_DATA primitive ............................................................................................................ 47

8.4.2.3 DL_U_ERROR primitive ...................................................................................................................... 47

9 C-plane peer-to-peer procedures ............................................................................................................ 47

ETSI
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oSIST prEN 300 175-4 V2.8.5:2022
5 ETSI EN 300 175-4 V2.8.5 (2021-12)

9.1 General ............................................................................................................................................................. 47

9.2 Point-to-point acknowledged operation............................................................................................................ 48

9.2.1 Procedure for the use of the P/F bit ............................................................................................................ 48

9.2.1.1 Class A acknowledged information transfer ......................................................................................... 48

9.2.1.2 Class B acknowledged information transfer ......................................................................................... 48

9.2.2 Use of LLN ................................................................................................................................................. 48

9.2.2.1 Class A operation .................................................................................................................................. 48

9.2.2.2 Class B operation .................................................................................................................................. 48

9.2.3 Link establishment and information transfer in class A operation .............................................................. 49

9.2.3.1 Establishing class A operation .............................................................................................................. 49

9.2.3.2 Class A acknowledged information transfer ......................................................................................... 49

9.2.3.3 Transmission of class A I-frames .......................................................................................................... 50

9.2.3.4 Reception of class A I-frames ............................................................................................................... 50

9.2.3.5 Receiving acknowledgements ............................................................................................................... 50

9.2.3.6 Waiting for acknowledgement .............................................................................................................. 51

9.2.3.7 Release of class A operation ................................................................................................................. 51

9.2.3.8 Re-establishment of class A operation .................................................................................................. 51

9.2.4 Establishing class B multiple frame operation ............................................................................................ 52

9.2.4.1 Overview ............................................................................................................................................... 52

9.2.4.2 Class B multiple frame establishment procedures ................................................................................. 52

9.2.4.3 Class B LLN assignment procedures .................................................................................................... 53

9.2.4.3.0 General ............................................................................................................................................ 53

9.2.4.3.1 PT establishment ............................................................................................................................. 54

9.2.4.3.2 FT establishment ............................................................................................................................. 54

9.2.5 Link maintenance and information transfer in class B multiple frame operation ....................................... 54

9.2.5.0 General .................................................................................................................................................. 54

9.2.5.1 Transmitting I-frames............................................................................................................................ 55

9.2.5.2 Receiving I-frames ................................................................................................................................ 55

9.2.5.2.0 General ............................................................................................................................................ 55

9.2.5.2.1 P bit set to 1 ..................................................................................................................................... 55

9.2.5.2.2 P bit set to 0 ..................................................................................................................................... 55

9.2.5.3 Sending and receiving acknowledgements ............................................................................................ 56

9.2.5.3.1 Sending acknowledgements ............................................................................................................ 56

9.2.5.3.2 Receiving acknowledgements ......................................................................................................... 56

9.2.5.4 Receiving REJ-frames ........................................................................................................................... 56

9.2.5.5 Receiving RNR-frames ......................................................................................................................... 57

9.2.5.6 LAPC own receiver busy condition ...................................................................................................... 58

9.2.5.7 Waiting acknowledgement .................................................................................................................... 59

9.2.5.8 Appropriate supervisory frame.............................................................................................................. 59

9.2.6 Release of class B multiple frame operation ............................................................................................... 59

9.2.7 Link suspension and resumption ................................................................................................................. 60

9.2.7.1 Link suspension ..................................................................................................................................... 60

9.2.7.1.0 General ............................................................................................................................................ 60

9.2.7.1.1 Class B acknowledged suspend ....................................................................................................... 60

9.2.7.1.2 Unacknowledged suspend ............................................................................................................... 61

9.2.7.2 Class B link resumption ........................................................................................................................ 62

9.2.7.3 Connection handover ............................................................................................................................ 63

9.2.7.3.0 General ............................................................................................................................................ 63

9.2.7.3.1 Class A connection handover .......................................................................................................... 65

9.2.7.3.2 Class B connection handover .......................................................................................................... 65

9.2.7.3.3 Expiry of connection handover timer ............................................................................................

...

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