SIST EN 300 175-4 V2.6.1:2015
Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
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.
Network layer Network layer
C-plane (3) U-plane
DLC layer DLC layer
C-plane (2b) U-plane
MAC layer
(2a)
Physical layer
(1)
Figure 1.1
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 (DCL)
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 za digitalne izboljšane brezvrvične telekomunikacije, ki uvaja širokopasovni govor, izpopolnjene podatkovne storitve, nove tipe rež in druge tehnične izpopolnitve.
General Information
Overview
SIST EN 300 175-4 V2.6.1:2015 defines the Data Link Control (DLC) layer for the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The DLC is layer 2b of the DECT protocol stack and provides the intermediate services between the MAC (layer 2a) and the Network (NWK) layer. The standard describes two operational planes - the Control plane (C‑plane) for reliable signalling and the User plane (U‑plane) for end‑to‑end user information - and includes provisions for New Generation DECT features such as wideband speech and improved data services.
Key topics and technical requirements
- Two‑plane architecture: Definitions and behaviors for the C‑plane (point‑to‑point reliable link access, broadcast Lb service) and the U‑plane (multiple circuit‑ and packet‑mode services with differing protection/delay characteristics).
- Service family: A set of independent U‑plane services ranging from “unprotected with low delay” (suitable for real‑time speech) to “highly protected with variable delay” (suitable for LAN/data applications).
- LAPC and LAPC+Lc: Specification of link access protocol types, operational states, establishment of information transfer modes, and Data Link Identifiers (DLI).
- Frame structures and fields: Detailed formats for C‑plane frame types (address, control, length indicator, fill and checksum fields), frame delimiting/transparency, routing to logical channels and handling of invalid frames.
- Primitives and SAPs: Defined primitives to the MAC (lower layer), NWK (higher layer) and interworking units, including S‑SAP and B‑SAP primitives (e.g., DL_ESTABLISH, DL_RELEASE, DL_DATA, DL_BROADCAST).
- Procedure elements: Control functions (S, U bits), sequence numbering, supervisory commands (RR, RNR, REJ), unnumbered commands (SABM, UI), and error handling.
- Management: Lower Layer Management Entity (LLME) interactions and service modification primitives.
- Standards alignment: Layered model terminology per ITU‑T X.200 and X.210.
Practical applications and who uses this standard
This standard is essential for:
- DECT equipment manufacturers implementing CI-compliant base stations, handsets, and fixed terminals.
- Firmware/software developers building DLC stack implementations (LAPC, frame handling, primitives).
- System integrators and network designers deploying DECT for voice, wideband speech, and data services in residential, enterprise and vertical‑market applications.
- Test houses and conformity assessment labs validating DECT CI interoperability and performance.
- Standards bodies and regulators referencing DECT DLC behavior for radio, mobility and TDD/TDMA deployments (keywords: DECT, DLC, Data Link Control, Common Interface, TDD, TDMA, IMT‑2000).
Related standards (if applicable)
- ETSI/EN 300 175 series (DECT Common Interface parts)
- ITU‑T X.200 and X.210 (layered model principles and terminology)
Keywords: DECT, DLC layer, Data Link Control, Common Interface, C‑plane, U‑plane, LAPC, broadcast Lb, New Generation DECT, wideband speech, TDMA, TDD, mobility, IMT‑2000.
Standards Content (Sample)
Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
2 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
Reference
REN/DECT-000304-4
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 - 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 only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
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
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If you find errors in the present document, please send your comment to one of the following services:
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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.
© European Telecommunications Standards Institute 2015.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
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 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Symbols and abbreviations . 16
4 Data Link Control (DLC) layer overview . 19
4.1 General . 19
4.2 C-plane services . 19
4.3 U-plane services . 20
4.4 Lower Layer Management Entity (LLME) . 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. 25
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 . 32
7.5 Control field parameters . 33
7.5.1 Poll/Final (P/F) bit . 33
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) . 33
ETSI
4 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
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
I
7.7.4 Extended length parameter (L ) . 36
JJ
7.7.5 Reserved bit (RES) . 36
7.8 Fill field format . 36
7.9 Checksum field format . 36
7.10 Checksum field parameters . 36
7.11 Commands and responses . 37
7.11.0 General . 37
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) . 40
8.3.0 General . 40
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 . 42
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 . 43
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 . 44
8.3.3 B-SAP primitives . 44
8.3.3.0 List of primitives . 44
8.3.3.1 DL_BROADCAST primitive . 45
8.3.3.2 DL_EXPEDITED primitive . 45
8.4 Primitives to the interworking unit . 45
8.4.0 General . 45
8.4.1 Parameter definitions . 45
8.4.2 LU -SAP primitives . 46
X
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 . 46
8.4.2.3 DL_U_ERROR primitive . 46
9 C-plane peer-to-peer procedures . 47
9.1 General . 47
9.2 Point to point acknowledged operation . 47
9.2.1 Procedure for the use of the P/F bit . 47
ETSI
5 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
9.2.1.1 Class A acknowledged information transfer . 47
9.2.1.2 Class B acknowledged information transfer . 47
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 . 48
9.2.3.1 Establishing class A operation . 48
9.2.3.2 Class A acknowledged information transfer . 49
9.2.3.3 Transmission of class A I-frames . 49
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 . 50
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 . 51
9.2.4.1 Overview . 51
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 . 53
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. 54
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 . 55
9.2.5.3.1 Sending acknowledgements . 55
9.2.5.3.2 Receiving acknowledgements . 55
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 . 58
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 . 61
9.2.7.3 Connection handover . 62
9.2.7.3.0 General . 62
9.2.7.3.1 Class A connection handover . 64
9.2.7.3.2 Class B connection handover . 64
9.2.7.3.3 Expiry of connection handover timer . 65
9.2.8 Re-establishment of class B multi-frame operation . 65
9.2.8.1 Criteria for re-establishment. 65
9.2.8.2 Procedure . 65
9.2.9 Exception handling . 66
9.2.9.1 General . 66
9.2.9.2 Class B exception condition reporting and recovery . 66
9.2.9.2.0 General . 66
9.2.9.2.1 N(S) sequence error . 66
9.2.9.2.2 N(R) sequence error . 67
9.2.9.2.3 Timer recovery condition . 67
9.2.9.2.4 Collision of identical transmitted and received commands . 67
9.3 Unacknowledged operation . 67
9.3.1 Use of LLN for unacknowledged information transfer . 67
9.3.2 Class U link establishment . 67
ETSI
6 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
9.3.3 Unacknowledged information transfer . 68
9.3.3.1 Transmission of unacknowledged information . 68
9.3.3.2 Reception of unacknowledged information . 68
9.3.4 Unacknowledged release . 68
9.4 Broadcast operation . 68
9.4.1 Normal operation . 68
9.4.1.1 Procedure in the Fixed radio Termination (FT) . 68
9.4.1.2 Procedure in the Portable radio Termination (PT) . 68
9.4.2 Expedited operation . 69
9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.2.2 Procedure in the Portable radio Termination (PT) . 69
9.5 MAC layer interfaces . 69
9.5.1 MC-SAP . 69
9.5.1.1 C-plane overview . 69
9.5.1.2 C-plane service data procedures . 70
9.5.1.3 U-plane service data . 70
9.5.2 MB-SAP . 70
9.5.2.0 General . 70
9.5.2.1 C-plane service data procedures . 71
9.5.2.2 U-plane service data . 71
9.5.3 MA-SAP . 71
9.5.3.1 Overview . 71
9.5.3.2 Service data procedures . 71
10 Management procedures. 72
10.1 Lower Layer Management Entity (LLME) . 72
10.2 MAC connection management . 72
10.2.0 General . 72
10.2.1 MAC connection set-up . 72
10.2.2 MAC connection release . 73
10.2.3 MAC connection modification . 73
10.2.4 MAC connection identifiers . 74
10.2.4.1 Overview . 74
10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 74
10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 74
10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75
10.2.5 Selection of logical channel (C or C ) . 75
S F
10.3 DLC C-plane (LAPC) management . 75
10.3.0 General . 75
10.3.1 Provision of link signature . 76
10.3.2 Routing of connection oriented links . 76
10.3.3 Routing of connectionless links . 76
10.4 DLC U-plane (LUX) management . 76
10.4.0 General . 76
10.4.1 U-plane establishment. 76
10.4.2 U-plane release . 77
10.4.3 U-plane suspend and resume . 77
10.5 Connection handover management . 77
10.6 Ciphering management . 78
10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 78
10.6.1.0 General . 78
10.6.1.1 Providing a key to the MAC layer . 78
10.6.1.2 Starting and stopping the ciphering . 78
10.6.1.3 Connection handover . 79
10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM
procedure . 79
10.7 Broadband data link management . 79
11 U-plane service characteristics . 80
11.1 General . 80
11.2 LU1 TRansparent UnProtected service (TRUP) . 80
11.3 LU2 Frame RELay service (FREL). 81
ETSI
7 Draft ETSI EN 300 175-4 V2.5.9 (2015-03)
11.3.1 General . 81
11.3.2 Checksum operation . 82
11.3.3 Segmentation and transmission class . 82
11.3.4 Data transmission . 83
11.3.4.1 Send side procedure . 83
11.3.4.2 Receive side procedure . 83
11.4 LU3 Frame SWItching service (FSWI) . 83
11.5 LU4 Forward Error Correction (FEC) service. 84
11.6 LU5 Basic RATe adaption service (BRAT) . 84
11.6.1 Overview . 84
11.6.2 Protected service operation . 85
11.6.2.1 General . 85
11.6.2.2 Data buffering and initial rate adaptation . 86
11.6.2.3 Multi-channel set multiplexing . 86
11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 88
11.6.2.5 Frame sequencing and addition of control and fill octets . 88
11.6.2.6 Frame transmission . 89
11.6.3 Unprotected service operation . 90
11.6.3.1 General . 90
11.6.3.2 Data buffering and initial rate adaption . 90
11.6.3.3 Multi-channel set multiplexing . 90
11.6.3.4 Segmentation of MDUs . 92
11.6.3.5 Frame transmission . 92
11.7 LU6 Secondary RATe adaption (SRAT) service . 92
11.7.1 General . 92
11.8 LU16 ESCape Service (ESC) . 93
11.8.1 General . 93
11.9 LU7 64 kbit/s data bearer service . 94
11.9.1 General . 94
11.9.2 Physical layer service. 94
11.9.3 MAC layer service . 94
11.9.4 DLC layer service . 94
11.9.4.1 Architectural model . 94
11.9.4.1.0 General .
...
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
2 ETSI EN 300 175-4 V2.6.1 (2015-07)
Reference
REN/DECT-000304-4
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 - 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 only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
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
http://portal.etsi.org/tb/status/status.asp
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.
© European Telecommunications Standards Institute 2015.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 ETSI EN 300 175-4 V2.6.1 (2015-07)
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 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Symbols and abbreviations . 16
4 Data Link Control (DLC) layer overview . 19
4.1 General . 19
4.2 C-plane services . 19
4.3 U-plane services . 20
4.4 Lower Layer Management Entity (LLME) . 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. 25
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 . 32
7.5 Control field parameters . 33
7.5.1 Poll/Final (P/F) bit . 33
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) . 33
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4 ETSI EN 300 175-4 V2.6.1 (2015-07)
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
I
7.7.4 Extended length parameter (L ) . 36
JJ
7.7.5 Reserved bit (RES) . 36
7.8 Fill field format . 36
7.9 Checksum field format . 36
7.10 Checksum field parameters . 36
7.11 Commands and responses . 37
7.11.0 General . 37
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) . 40
8.3.0 General . 40
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 . 42
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 . 43
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 . 44
8.3.3 B-SAP primitives . 44
8.3.3.0 List of primitives . 44
8.3.3.1 DL_BROADCAST primitive . 45
8.3.3.2 DL_EXPEDITED primitive . 45
8.4 Primitives to the interworking unit . 45
8.4.0 General . 45
8.4.1 Parameter definitions . 45
8.4.2 LU -SAP primitives . 46
X
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 . 46
8.4.2.3 DL_U_ERROR primitive . 46
9 C-plane peer-to-peer procedures . 47
9.1 General . 47
9.2 Point to point acknowledged operation . 47
9.2.1 Procedure for the use of the P/F bit . 47
ETSI
5 ETSI EN 300 175-4 V2.6.1 (2015-07)
9.2.1.1 Class A acknowledged information transfer . 47
9.2.1.2 Class B acknowledged information transfer . 47
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 . 48
9.2.3.1 Establishing class A operation . 48
9.2.3.2 Class A acknowledged information transfer . 49
9.2.3.3 Transmission of class A I-frames . 49
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 . 50
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 . 51
9.2.4.1 Overview . 51
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 . 53
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. 54
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 . 55
9.2.5.3.1 Sending acknowledgements . 55
9.2.5.3.2 Receiving acknowledgements . 55
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 . 58
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 . 61
9.2.7.3 Connection handover . 62
9.2.7.3.0 General . 62
9.2.7.3.1 Class A connection handover . 64
9.2.7.3.2 Class B connection handover . 64
9.2.7.3.3 Expiry of connection handover timer . 65
9.2.8 Re-establishment of class B multi-frame operation . 65
9.2.8.1 Criteria for re-establishment. 65
9.2.8.2 Procedure . 65
9.2.9 Exception handling . 66
9.2.9.1 General . 66
9.2.9.2 Class B exception condition reporting and recovery . 66
9.2.9.2.0 General . 66
9.2.9.2.1 N(S) sequence error . 66
9.2.9.2.2 N(R) sequence error . 67
9.2.9.2.3 Timer recovery condition . 67
9.2.9.2.4 Collision of identical transmitted and received commands . 67
9.3 Unacknowledged operation . 67
9.3.1 Use of LLN for unacknowledged information transfer . 67
9.3.2 Class U link establishment . 67
ETSI
6 ETSI EN 300 175-4 V2.6.1 (2015-07)
9.3.3 Unacknowledged information transfer . 68
9.3.3.1 Transmission of unacknowledged information . 68
9.3.3.2 Reception of unacknowledged information . 68
9.3.4 Unacknowledged release . 68
9.4 Broadcast operation . 68
9.4.1 Normal operation . 68
9.4.1.1 Procedure in the Fixed radio Termination (FT) . 68
9.4.1.2 Procedure in the Portable radio Termination (PT) . 68
9.4.2 Expedited operation . 69
9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.2.2 Procedure in the Portable radio Termination (PT) . 69
9.5 MAC layer interfaces . 69
9.5.1 MC-SAP . 69
9.5.1.1 C-plane overview . 69
9.5.1.2 C-plane service data procedures . 70
9.5.1.3 U-plane service data . 70
9.5.2 MB-SAP . 70
9.5.2.0 General . 70
9.5.2.1 C-plane service data procedures . 71
9.5.2.2 U-plane service data . 71
9.5.3 MA-SAP . 71
9.5.3.1 Overview . 71
9.5.3.2 Service data procedures . 71
10 Management procedures. 72
10.1 Lower Layer Management Entity (LLME) . 72
10.2 MAC connection management . 72
10.2.0 General . 72
10.2.1 MAC connection set-up . 72
10.2.2 MAC connection release . 73
10.2.3 MAC connection modification . 73
10.2.4 MAC connection identifiers . 73
10.2.4.1 Overview . 73
10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 74
10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 74
10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75
10.2.5 Selection of logical channel (C or C ) . 75
S F
10.3 DLC C-plane (LAPC) management . 75
10.3.0 General . 75
10.3.1 Provision of link signature . 75
10.3.2 Routing of connection oriented links . 76
10.3.3 Routing of connectionless links . 76
10.4 DLC U-plane (LUX) management . 76
10.4.0 General . 76
10.4.1 U-plane establishment. 76
10.4.2 U-plane release . 77
10.4.3 U-plane suspend and resume . 77
10.5 Connection handover management . 77
10.6 Ciphering management . 78
10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 78
10.6.1.0 General . 78
10.6.1.1 Providing a key to the MAC layer . 78
10.6.1.2 Starting and stopping the ciphering . 78
10.6.1.3 Connection handover . 78
10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM
procedure . 79
10.7 Broadband data link management . 79
11 U-plane service characteristics . 79
11.1 General . 79
11.2 LU1 TRansparent UnProtected service (TRUP) . 80
11.3 LU2 Frame RELay service (FREL). 80
ETSI
7 ETSI EN 300 175-4 V2.6.1 (2015-07)
11.3.1 General . 80
11.3.2 Checksum operation . 81
11.3.3 Segmentation and transmission class . 82
11.3.4 Data transmission . 82
11.3.4.1 Send side procedure . 82
11.3.4.2 Receive side procedure . 83
11.4 LU3 Frame SWItching service (FSWI) . 83
11.5 LU4 Forward Error Correction (FEC) service. 84
11.6 LU5 Basic RATe adaption service (BRAT) . 84
11.6.1 Overview . 84
11.6.2 Protected service operation . 85
11.6.2.1 General . 85
11.6.2.2 Data buffering and initial rate adaptation . 85
11.6.2.3 Multi-channel set multiplexing . 86
11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 88
11.6.2.5 Frame sequencing and addition of control and fill octets . 88
11.6.2.6 Frame transmission . 89
11.6.3 Unprotected service operation . 90
11.6.3.1 General . 90
11.6.3.2 Data buffering and initial rate adaption . 90
11.6.3.3 Multi-channel set multiplexing . 90
11.6.3.4 Segmentation of MDUs . 91
11.6.3.5 Frame transmission . 92
11.7 LU6 Secondary RATe adaption (SRAT) service . 92
11.7.1 General . 92
11.8 LU16 ESCape Service (ESC) . 93
11.8.1 General . 93
11.9 LU7 64 kbit/s data bearer service . 94
11.9.1 General . 94
11.9.2 Physical layer service. 94
11.9.3 MAC layer service . 94
11.9.4 DLC layer service . 94
11.9.4.1 Architectural model . 94
11.9.4.1.0 General .
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer35.100.20Podatkovni povezovalni slojData link layer33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)ICS:Ta slovenski standard je istoveten z:EN 300 175-4 V2.6.1SIST EN 300 175-4 V2.6.1:2015en,fr,de01-november-2015SIST EN 300 175-4 V2.6.1:2015SLOVENSKI
STANDARD
EUROPEAN STANDARD SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 2
Reference REN/DECT-000304-4 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 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
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© European Telecommunications Standards Institute 2015. All rights reserved.
DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 3 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 Definitions, symbols and abbreviations . 16 3.1 Definitions . 16 3.2 Symbols and abbreviations . 16 4 Data Link Control (DLC) layer overview . 19 4.1 General . 19 4.2 C-plane services . 19 4.3 U-plane services . 20 4.4 Lower Layer Management Entity (LLME) . 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. 25 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 CS/CLS logical channel . 29 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 . 32 7.5 Control field parameters . 33 7.5.1 Poll/Final (P/F) bit . 33 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) . 33 SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 4 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 (LI) . 35 7.7.4 Extended length parameter (LJJ) . 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 . 36 7.11 Commands and responses . 37 7.11.0 General . 37 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) . 40 8.3.0 General . 40 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 . 42 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 . 43 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 . 44 8.3.3 B-SAP primitives . 44 8.3.3.0 List of primitives . 44 8.3.3.1 DL_BROADCAST primitive . 45 8.3.3.2 DL_EXPEDITED primitive . 45 8.4 Primitives to the interworking unit . 45 8.4.0 General . 45 8.4.1 Parameter definitions . 45 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 . 46 8.4.2.3 DL_U_ERROR primitive . 46 9 C-plane peer-to-peer procedures . 47 9.1 General . 47 9.2 Point to point acknowledged operation . 47 9.2.1 Procedure for the use of the P/F bit . 47 SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 5 9.2.1.1 Class A acknowledged information transfer . 47 9.2.1.2 Class B acknowledged information transfer . 47 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 . 48 9.2.3.1 Establishing class A operation . 48 9.2.3.2 Class A acknowledged information transfer . 49 9.2.3.3 Transmission of class A I-frames . 49 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 . 50 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 . 51 9.2.4.1 Overview . 51 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 . 53 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. 54 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 . 55 9.2.5.3.1 Sending acknowledgements . 55 9.2.5.3.2 Receiving acknowledgements . 55 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 . 58 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 . 61 9.2.7.3 Connection handover . 62 9.2.7.3.0 General . 62 9.2.7.3.1 Class A connection handover . 64 9.2.7.3.2 Class B connection handover . 64 9.2.7.3.3 Expiry of connection handover timer . 65 9.2.8 Re-establishment of class B multi-frame operation . 65 9.2.8.1 Criteria for re-establishment. 65 9.2.8.2 Procedure . 65 9.2.9 Exception handling . 66 9.2.9.1 General . 66 9.2.9.2 Class B exception condition reporting and recovery . 66 9.2.9.2.0 General . 66 9.2.9.2.1 N(S) sequence error . 66 9.2.9.2.2 N(R) sequence error . 67 9.2.9.2.3 Timer recovery condition . 67 9.2.9.2.4 Collision of identical transmitted and received commands . 67 9.3 Unacknowledged operation . 67 9.3.1 Use of LLN for unacknowledged information transfer . 67 9.3.2 Class U link establishment . 67 SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 6 9.3.3 Unacknowledged information transfer . 68 9.3.3.1 Transmission of unacknowledged information . 68 9.3.3.2 Reception of unacknowledged information . 68 9.3.4 Unacknowledged release . 68 9.4 Broadcast operation . 68 9.4.1 Normal operation . 68 9.4.1.1 Procedure in the Fixed radio Termination (FT) . 68 9.4.1.2 Procedure in the Portable radio Termination (PT) . 68 9.4.2 Expedited operation . 69 9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69 9.4.2.2 Procedure in the Portable radio Termination (PT) . 69 9.5 MAC layer interfaces . 69 9.5.1 MC-SAP . 69 9.5.1.1 C-plane overview . 69 9.5.1.2 C-plane service data procedures . 70 9.5.1.3 U-plane service data . 70 9.5.2 MB-SAP . 70 9.5.2.0 General . 70 9.5.2.1 C-plane service data procedures . 71 9.5.2.2 U-plane service data . 71 9.5.3 MA-SAP . 71 9.5.3.1 Overview . 71 9.5.3.2 Service data procedures . 71 10 Management procedures. 72 10.1 Lower Layer Management Entity (LLME) . 72 10.2 MAC connection management . 72 10.2.0 General . 72 10.2.1 MAC connection set-up . 72 10.2.2 MAC connection release . 73 10.2.3 MAC connection modification . 73 10.2.4 MAC connection identifiers . 73 10.2.4.1 Overview . 73 10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 74 10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 74 10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75 10.2.5 Selection of logical channel (CS or CF) . 75 10.3 DLC C-plane (LAPC) management . 75 10.3.0 General . 75 10.3.1 Provision of link signature . 75 10.3.2 Routing of connection oriented links . 76 10.3.3 Routing of connectionless links . 76 10.4 DLC U-plane (LUX) management . 76 10.4.0 General . 76 10.4.1 U-plane establishment. 76 10.4.2 U-plane release . 77 10.4.3 U-plane suspend and resume . 77 10.5 Connection handover management . 77 10.6 Ciphering management . 78 10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 78 10.6.1.0 General . 78 10.6.1.1 Providing a key to the MAC layer . 78 10.6.1.2 Starting and stopping the ciphering . 78 10.6.1.3 Connection handover . 78 10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM procedure . 79 10.7 Broadband data link management . 79 11 U-plane service characteristics . 79 11.1 General . 79 11.2 LU1 TRansparent UnProtected service (TRUP) . 80 11.3 LU2 Frame RELay service (FREL). 80 SIST EN 300 175-4 V2.6.1:2015
ETSI ETSI EN 300 175-4 V2.6.1 (2015-07) 7 11.3.1 General . 80 11.3.2 Checksum operation . 81 11.3.3 Segmentation and transmission class . 82 11.3.4 Data transmission . 82 11.3.4.1 Send side procedure . 82 11.3.4.2 Receive side procedure . 83 11.4 LU3 Frame SWItching service (FSWI) . 83 11.5 LU4 Forward Error Correction (FEC) service. 84 11.6 LU5 Basic RATe adaption service (BRAT) . 84 11.6.1 Overview . 84 11.6.2 Protected service operation . 85 11.6.2.1 General . 85 11.6.2.2 Data buffering and initial rate adaptation . 85 11.6.2.3 Multi-channel set multiplexing . 86 11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 88 11.6.2.5 Frame sequencing and addition of control and fill octets . 88 11.6.2.6 Frame transmission . 89 11.6.3 Unprotected service operation . 90 11.6.3.1 General . 90 11.6.3.2 Data buffering and initial rate adaption . 90 11.6.3.3 Multi-channel set multiplexing . 90 11.6.3.4 Segmentation of MDUs . 91 11.6.3.5 Frame transmission . 92 11.7 LU6 Secondary RATe adaption (SRAT) service . 92 11.7.1 General . 92 11.8 LU16 ESCape Service (ESC) . 93 11.8.1 General . 93 11.9 LU7 64 kbit/s data bearer service . 94 11.9.1 General . 94 11.9.2 Physical layer service. 94 11.9.3 MAC layer service . 94 11.9.4 DLC layer service . 94 11.9.4.1 Architectural model . 94 11.9.4.1.0 General .
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Frequently Asked Questions
SIST EN 300 175-4 V2.6.1:2015 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer". This standard covers: 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. Network layer Network layer C-plane (3) U-plane DLC layer DLC layer C-plane (2b) U-plane MAC layer (2a) Physical layer (1) Figure 1.1 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.
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. Network layer Network layer C-plane (3) U-plane DLC layer DLC layer C-plane (2b) U-plane MAC layer (2a) Physical layer (1) Figure 1.1 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.
SIST EN 300 175-4 V2.6.1:2015 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT); 35.100.20 - Data link layer. The ICS classification helps identify the subject area and facilitates finding related standards.
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