SIST EN 300 175-4 V1.8.1:2006

• Abstract:

  The present document gives an introduction and overview of the complete 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. The present document uses the layered model principles and terminology as described in ITU-T Recommendation X.200 [12] and ITU-T Recommendation X.210 [13].

• Status: Published
• Publication Date: 28-Feb-2006
• ICS: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT)
• ICS: 35.100.20 - Data link layer
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2006
• Due Date: 01-Mar-2006
• Completion Date: 01-Mar-2006
• Ref Project: ETSI EN 300 175-4 V1.8.1 (2004-11) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer

Overview

SIST EN 300 175-4 V1.8.1:2006 is a Slovenian standard aligned with the European Standard EN 300 175-4, developed by the European Telecommunications Standards Institute (ETSI). It focuses on the Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer. This document defines the structure, roles, and operation of the Data Link Control Layer, serving as a crucial component (Layer 2b) in the DECT protocol stack.

The standard outlines two main planes of operation within the DLC layer - the Control Plane (C-plane) for signaling and network message reliability, and the User Plane (U-plane) dedicated to end-to-end user information transfer. By specifying robust error-protected services, point-to-point and point-to-multipoint capabilities, and flexible transmission modes, SIST EN 300 175-4:2006 enables efficient communication and interoperability for DECT devices.

Key Topics

• Data Link Control (DLC) Layer Overview
  • Comprises the second sublayer in the DECT protocol stack.
  • Divided into the C-plane (Control) and U-plane (User) functionalities.
• C-plane Services
  • Manages reliable, error-protected transmission for network messages.
  • Supports data link establishment, maintenance, and release.
  • Offers point-to-point and broadcast (Lb) services.
• U-plane Services
  • Handles user data transmission, focused on application-dependent procedures.
  • Provides various services including circuit-mode and packet-mode operations.
  • Ensures flexible adaptation for different performance requirements, from low-delay speech to variable delay LAN applications.
• Layered Model Principles
  • Follows ITU-T Recommendations X.200 and X.210 for open systems interconnection.
• Primitives and Procedures
  • Includes specifications for interactions with adjacent protocol layers.
  • Defines management operations, peer-to-peer communication, and service establishment.

Applications

The practical applications of SIST EN 300 175-4 V1.8.1:2006 span a wide range of DECT-based wireless communication environments, including:

• Cordless Phone Systems: Ensures robust base-to-handset and handset-to-handset communication through reliable DLC operations.
• Wireless Office and Home Networks: Supports both voice and data transfers, accommodating requirements from low latency calls to high integrity LAN transmissions.
• Industrial and Enterprise DECT Solutions: Facilitates secure and flexible connectivity for user endpoints, including mobile communication devices and wireless access points.
• Point-to-Point and Broadcast Services: Enables advanced signaling methods, device registration, paging, and group communication services in DECT networks.
• Interoperable DECT Devices: Promotes compatibility between devices from different manufacturers by providing standardized layer 2b operations.

Related Standards

To ensure full DECT system interoperability and compliance, SIST EN 300 175-4 V1.8.1:2006 should be considered in conjunction with the following related standards:

• SIST EN 300 175-1: DECT Common Interface - Overview.
• SIST EN 300 175-2: DECT Common Interface - Physical Layer.
• SIST EN 300 175-3: DECT Common Interface - Medium Access Control (MAC) Layer.
• ITU-T X.200, X.210: OSI Reference Model standards for layered communications.
• Other DECT Common Interface Parts: Covering network, security, and management aspects for comprehensive DECT deployment.

Keywords: DECT, Data Link Control, Common Interface, C-plane, U-plane, wireless telecommunications, data link layer, cordless communications, ETSI standards, protocol stack, signaling, interoperability.

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 Version 1.8.1SIST EN 300 175-4 V1.8.1:2006en01-marec-2006SIST EN 300 175-4 V1.8.1:2006SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 2
Reference REN/DECT-000215-4 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 3
Contents Intellectual Property Rights.11 Foreword.11 1 Scope.12 2 References.12 3 Definitions, symbols and abbreviations.13 3.1 Definitions.13 3.2 Symbols.13 3.3 Abbreviations.13 4 Data Link Control (DLC) layer overview.15 4.1 General.15 4.2 C-plane services.16 4.3 U-plane services.16 4.4 Lower Layer Management Entity (LLME).19 5 C-plane service characteristics.19 5.1 Data link service (LAPC+Lc).19 5.1.1 General.19 5.1.2 LAPC types of operation.20 5.1.3 Establishment of information transfer modes.20 5.1.3.1 Data Link Identifier (DLI).20 5.1.3.2 LAPC states.20 5.2 Broadcast service (Lb).21 6 Frame structures for C-plane services.22 6.1 Data link service frame structure.22 6.1.1 General frame structure.22 6.1.2 Lc frame delimiting and transparency.23 6.1.3 Transmission order.23 6.1.4 Routing to logical channels.23 6.1.4.1 CF/CLF logical channel.23 6.1.4.2 CS/CLS logical channel.24 6.1.5 Invalid frames.24 6.2 Broadcast service frame structure.25 6.2.1 Standard frame structure.25 6.2.2 Extended frame structure.25 7 Elements of procedures and formats of fields for C-plane peer-to-peer communication.26 7.1 General.26 7.2 Address field formats.26 7.3 Address field parameters.26 7.3.1 REServed bit (RES).26 7.3.2 Command Response (C/R) bit.26 7.3.3 SAPI field.27 7.3.4 New Link Flag (NLF) bit.27 7.3.5 LLN-field.27 7.3.6 Data Link Identifiers (DLI).27 7.4 Control field formats.28 7.5 Control field parameters.28 7.5.1 Poll/Final (P/F) bit.28 7.5.2 Multiple frame operation variables and sequence numbers.28 7.5.2.1 Modulus.28 7.5.2.2 Send state Variable V(S).29 7.5.2.3 Acknowledge state Variable V(A).29 7.5.2.4 Send sequence Number N(S).29 7.5.2.5 Receive state Variable V(R).29 SIST EN 300 175-4 V1.8.1:2006

ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 4
7.5.2.6 Receive sequence Number N(R).29 7.5.3 Unacknowledged operation variables and sequence numbers.29 7.5.4 Supervisory and Unnumbered function bits S and U.29 7.6 Length indicator field format.30 7.7 Length indicator field parameters.30 7.7.1 Length indicator field extension bit (N).30 7.7.2 More data bit (M).30 7.7.3 Length parameter (LI).31 7.7.4 Extended length parameter (LJJ).31 7.7.5 Reserved bit (RES).31 7.8 Fill field format.31 7.9 Checksum field format.32 7.10 Checksum field parameters.32 7.11 Commands and responses.33 7.11.1 Information (I) command.33 7.11.2 Receive Ready (RR) command/response.34 7.11.3 Receive Not Ready (RNR) command/response.34 7.11.4 REJect (REJ) command/response.34 7.11.5 Set Asynchronous Balanced Mode (SABM) command.34 7.11.6 Disconnect Mode (DM) response.35 7.11.7 Unnumbered Information (UI) command.35 7.11.8 DISConnect (DISC) command.35 7.11.9 Unnumbered ACK (UA) response.35 8 Primitives.35 8.1 Primitive types.35 8.2 Primitives to the MAC layer (lower layer).36 8.3 Primitives to the NWK layer (higher layer).36 8.3.1 Parameter definitions.36 8.3.2 S-SAP primitives.37 8.3.2.1 DL_ESTABLISH primitive.37 8.3.2.2 DL_RELEASE primitive.38 8.3.2.3 DL_DATA primitive.38 8.3.2.4 DL_UNIT_DATA primitive.38 8.3.2.5 DL_SUSPEND primitive.38 8.3.2.6 DL_RESUME primitive.39 8.3.2.7 DL_ENC_KEY primitive.39 8.3.2.8 DL_ENCRYPT primitive.39 8.3.2.9 DL_SERVICE_MOD primitive.39 8.3.3 B-SAP primitives.40 8.3.3.1 DL_BROADCAST primitive.40 8.3.3.2 DL_EXPEDITED primitive.40 8.4 Primitives to the interworking unit.40 8.4.1 Parameter definitions.40 8.4.2 LUX-SAP primitives.41 8.4.2.1 DL_U_DATA primitive.41 8.4.2.2 DL_U_UNIT_DATA primitive.41 8.4.2.3 DL_U_ERROR primitive.41 9 C-plane peer-to-peer procedures.42 9.1 General.42 9.2 Point to point acknowledged operation.42 9.2.1 Procedure for the use of the P/F bit.42 9.2.1.1 Class A acknowledged information transfer.42 9.2.1.2 Class B acknowledged information transfer.43 9.2.2 Use of LLN.43 9.2.2.1 Class A operation.43 9.2.2.2 Class B operation.43 9.2.3 Link establishment and information transfer in class A operation.43 9.2.3.1 Establishing class A operation.43 9.2.3.2 Class A acknowledged information transfer.44 9.2.3.3 Transmission of class A I-frames.44 SIST EN 300 175-4 V1.8.1:2006

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9.2.3.4 Reception of class A I-frames.45 9.2.3.5 Receiving acknowledgements.45 9.2.3.6 Waiting for acknowledgement.45 9.2.3.7 Release of class A operation.46 9.2.3.8 Re-establishment of class A operation.46 9.2.4 Establishing class B multiple frame operation.46 9.2.4.1 Overview.46 9.2.4.2 Class B multiple frame establishment procedures.47 9.2.4.3 Class B LLN assignment procedures.48 9.2.4.3.1 PT establishment.48 9.2.4.3.2 FT establishment.49 9.2.5 Link maintenance and information transfer in class B multiple frame operation.49 9.2.5.1 Transmitting I-frames.49 9.2.5.2 Receiving I-frames.50 9.2.5.2.1 P bit set to 1.50 9.2.5.2.2 P bit set to 0.50 9.2.5.3 Sending and receiving acknowledgements.50 9.2.5.3.1 Sending acknowledgements.50 9.2.5.3.2 Receiving acknowledgements.50 9.2.5.4 Receiving REJ-frames.51 9.2.5.5 Receiving RNR-frames.52 9.2.5.6 LAPC own receiver busy condition.53 9.2.5.7 Waiting acknowledgement.53 9.2.5.8 Appropriate supervisory frame.54 9.2.6 Release of class B multiple frame operation.54 9.2.7 Link suspension and resumption.55 9.2.7.1 Link suspension.55 9.2.7.1.1 Class B acknowledged suspend.55 9.2.7.1.2 Unacknowledged suspend.56 9.2.7.2 Class B link resumption.57 9.2.7.3 Connection handover.58 9.2.7.3.1 Class A connection handover.59 9.2.7.3.2 Class B connection handover.60 9.2.7.3.3 Expiry of connection handover timer.60 9.2.8 Re-establishment of class B multi-frame operation.60 9.2.8.1 Criteria for re-establishment.60 9.2.8.2 Procedure.61 9.2.9 Exception handling.61 9.2.9.1 General.61 9.2.9.2 Class B exception condition reporting and recovery.62 9.2.9.2.1 N(S) sequence error.62 9.2.9.2.2 N(R) sequence error.62 9.2.9.2.3 Timer recovery condition.62 9.2.9.2.4 Collision of identical transmitted and received commands.62 9.3 Unacknowledged operation.63 9.3.1 Use of LLN for unacknowledged information transfer.63 9.3.2 Class U link establishment.63 9.3.3 Unacknowledged information transfer.63 9.3.3.1 Transmission of unacknowledged information.63 9.3.3.2 Reception of unacknowledged information.63 9.3.4 Unacknowledged release.63 9.4 Broadcast operation.64 9.4.1 Normal operation.64 9.4.1.1 Procedure in the Fixed radio Termination (FT).64 9.4.1.2 Procedure in the Portable radio Termination (PT).64 9.4.2 Expedited operation.64 9.4.2.1 Procedure in the Fixed radio Termination (FT).64 9.4.2.2 Procedure in the Portable radio Termination (PT).64 9.5 MAC layer interfaces.65 9.5.1 MC-SAP.65 9.5.1.1 C-plane overview.65 9.5.1.2 C-plane service data procedures.65 SIST EN 300 175-4 V1.8.1:2006

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9.5.1.3 U-plane service data.66 9.5.2 MB-SAP.66 9.5.2.1 C-plane service data procedures.66 9.5.2.2 U-plane service data.66 9.5.3 MA-SAP.67 9.5.3.1 Overview.67 9.5.3.2 Service data procedures.67 10 Management procedures.67 10.1 Lower Layer Management Entity (LLME).67 10.2 MAC connection management.68 10.2.1 MAC connection set-up.68 10.2.2 MAC connection release.68 10.2.3 MAC connection modification.68 10.2.4 MAC connection identifiers.69 10.2.4.1 Overview.69 10.2.4.2 Advanced MAC Connection Identifiers (AMCI).69 10.2.4.3 Basic MAC Connection Identifiers (BMCI).70 10.2.4.4 MAC Connection Endpoint Identifier (MCEI).70 10.2.5 Selection of logical channel (CS or CF).70 10.3 DLC C-plane (LAPC) management.71 10.3.1 Provision of link signature.71 10.3.2 Routing of connection oriented links.71 10.3.3 Routing of connectionless links.72 10.4 DLC U-plane (LUX) management.72 10.4.1 U-plane establishment.72 10.4.2 U-plane release.72 10.4.3 U-plane suspend and resume.72 10.5 Connection handover management.73 10.6 Ciphering management.73 10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure.73 10.6.1.1 Providing a key to the MAC layer.73 10.6.1.2 Starting and stopping the ciphering.74 10.6.1.3 Connection handover.74 10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM procedure.74 10.7 Broadband data link management.74 11 U-plane service characteristics.75 11.1 General.75 11.2 LU1 TRansparent UnProtected service (TRUP).75 11.3 LU2 Frame RELay service (FREL).76 11.3.1 General.76 11.3.2 Checksum operation.77 11.3.3 Segmentation and transmission class.77 11.3.4 Data transmission.78 11.3.4.1 Send side procedure.78 11.3.4.2 Receive side procedure.78 11.4 LU3 Frame SWItching service (FSWI).79 11.5 LU4 Forward Error Correction (FEC) service.79 11.6 LU5 Basic Rate Adaption service (BRAT).80 11.6.1 Overview.80 11.6.2 Protected service operation.81 11.6.2.1 General.81 11.6.2.2 Data buffering and initial rate adaptation.81 11.6.2.3 Multi-channel set multiplexing.82 11.6.2.4 Segmentation of Multiplexed Data Units (MDU).83 11.6.2.5 Frame sequencing and addition of control and fill octets.84 11.6.2.6 Frame transmission.85 11.6.3 Unprotected service operation.86 11.6.3.1 General.86 11.6.3.2 Data buffering and initial rate adaption.86 SIST EN 300 175-4 V1.8.1:2006

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11.6.3.3 Multi-channel set multiplexing.86 11.6.3.4 Segmentation of MDUs.87 11.6.3.5 Frame transmission.88 11.7 LU6 Secondary Rate AdapTion (SRAT) service.88 11.7.1 General.88 11.8 LU16 ESCape Service (ESC).89 11.8.1 General.89 11.9 LU7 64 kbit/s data bearer service.90 11.9.1 General.90 11.9.2 Physical layer service.90 11.9.3 MAC layer service.90 11.9.4 DLC layer service.90 11.9.4.1 Architectural model.90 11.9.4.1.1 Transmit (Tx) frame buffering.91 11.9.4.1.2 Receive (Rx) frame buffering.91 11.9.4.2 Automatic-Repeat-Request (ARQ) and Forward Error Control (FEC).91 11.9.4.2.1 Control field.92 11.9.4.2.2 Information field.94 11.9.4.2.3 ARQ checksum.95 11.9.4.3 Procedures for normal operation.95 11.9.4.3.1 Establishment and synchronization procedures.95 11.9.4.3.2 Active phase.97 11.9.4.3.3 Release.99 11.9.4.4 Exceptional procedures.99 11.9.4.4.1 Invalid frame condition.99 11.9.4.4.2 Establishment.99 11.9.4.4.3 Transmitting frames.99 11.9.4.4.4 Receiving frames.99 11.9.4.4.5 Sending acknowledgements.100 11.9.4.4.6 Forwarding of received data.100 11.9.4.4.7 N(R) sequence error.100 11.9.4.4.8 N(O) sequence error.100 11.9.4.4.9 N(S) sequence error.101 11.9.4.4.10 Format error.101 11.9.4.4.11 Abnormal release.101 11.9.4.4.12 Implicit reset.101 11.9.5 Network layer service.101 11.9.5.1 LCE service.101 11.9.5.2 CC service.101 11.10 LU8 service.102 11.10.1 Physical layer service.102 11.10.2 MAC layer service.
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