SIST EN 300 175-4 V1.7.1:2003

• Abstract:

  Maintenance update to include elements for the high speed DECT service.

• Status: Published
• Publication Date: 30-Nov-2003
• 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-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 175-4 V1.7.1 (2003-07) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer

Overview

SIST EN 300 175-4 V1.7.1:2003 specifies the Data Link Control (DLC) layer within the Common Interface (CI) for Digital Enhanced Cordless Telecommunications (DECT) systems. Issued by the Slovenski inštitut za standardizacijo (SIST) and aligned with ETSI EN 300 175-4, this standard is a key reference for the reliable transmission of data in DECT networks. The 2003 maintenance update includes important elements supporting high-speed DECT services, ensuring continued interoperability and robust data communication capabilities.

Digital Enhanced Cordless Telecommunications (DECT) is widely adopted for secure, high-quality wireless voice and data communication. The DLC layer, defined in this standard, manages critical aspects of data transmission, error correction, and link integrity between devices within DECT systems.

Keywords: DECT, Data Link Control, wireless communication, digital cordless, high-speed service, CI, SIST, ETSI.

Key Topics

• Data Link Control (DLC) Layer Functions

  • Ensures reliable data transfer across the DECT radio interface.
  • Manages both acknowledged and unacknowledged data services for point-to-point and broadcast communication.

• Service Planes

  • C-plane (Control Plane): Handles control signaling, including connection setup, maintenance, and release.
  • U-plane (User Plane): Manages user data, supporting various adaptation and error correction mechanisms for different service needs.

• High-Speed DECT Support

  • Includes updates to accommodate higher data rates and enhanced service capabilities.

• Frame Structures and Procedures

  • Defines structures for data and control frames.
  • Details field formats, sequence number handling, error correction (checksum), and retransmission procedures.

• Management Procedures

  • Addresses connection management, handover, suspension, and ciphering for secure communication.

Applications

SIST EN 300 175-4 is crucial for manufacturers, system integrators, and service providers working with DECT technology. Typical applications include:

• Enterprise Cordless Telephony: Reliable, secure voice and data links in office and industrial environments.
• DECT Data Communications: High-speed data services for wireless terminals.
• Consumer DECT Products: Ensures compatibility and performance for products like cordless phones and smart home devices.
• Healthcare and Hospitality: Robust, interference-free communication systems in environments demanding high reliability.

The DLC layer's well-defined interfaces and procedures drive seamless interoperability between DECT devices, minimize downtime, and support high user mobility.

Related Standards

For a comprehensive DECT solution, SIST EN 300 175-4 is used alongside these related standards:

• SIST EN 300 175-1: DECT Common Interface - Overview.
• SIST EN 300 175-2: Physical Layer (PHY).
• SIST EN 300 175-3: Medium Access Control (MAC) layer.
• SIST EN 300 175-5: Network (NWK) layer.
• SIST EN 300 175-7: Security features.
• ETSI EN 301 406: Harmonized standard for access to the radio spectrum.

Practical Value

Adhering to SIST EN 300 175-4 ensures full compatibility and optimal performance within DECT networks, enabling:

• Faster deployment of high-speed DECT services.
• Enhanced reliability for critical wireless communication systems.
• Smooth integration with evolving DECT infrastructure.

This standard supports a consistent, future-proof approach to digital cordless telecommunications, solidifying its role in both current operations and upcoming DECT advancements.

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 1.7.1SIST EN 300 175-4 V1.7.1:2003en01-december-2003SIST EN 300 175-4 V1.7.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-4 V1.7.1 (2003-07) 2
Reference REN/DECT-000201-4 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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© European Telecommunications Standards Institute 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 175-4 V1.7.1:2003

ETSI ETSI EN 300 175-4 V1.7.1 (2003-07) 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 and abbreviations.13 4 Data Link Control (DLC) layer overview.15 4.1 General.15 4.2 C-plane services.15 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.29 7.5.2.1 Modulus.29 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 V1.7.1:2003

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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.30 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 V1.7.1:2003

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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 9.2.7.1.2.1 Class A.56 9.2.7.1.2.2 Class B.56 9.2.7.1.2.3 Class U.57 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 SIST EN 300 175-4 V1.7.1:2003

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9.5.1 MC-SAP.65 9.5.1.1 C-plane overview.65 9.5.1.2 C-plane service data procedures.65 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.67 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.73 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 11 U-plane service characteristics.74 11.1 General.74 11.2 LU1 TRansparent UnProtected service (TRUP).75 11.3 LU2 Frame RELay service (FREL).75 11.3.1 General.75 11.3.2 Checksum operation.76 11.3.3 Segmentation and transmission class.77 11.3.4 Data transmission.77 11.3.4.1 Send side procedure.77 11.3.4.2 Receive side procedure.77 11.4 LU3 Frame SWItching service (FSWI).78 11.5 LU4 Forward Error Correction service (FEC).78 11.6 LU5 Basic Rate Adaption service (BRAT).79 11.6.1 Overview.79 11.6.2 Protected service operation.80 11.6.2.1 General.80 11.6.2.2 Data buffering and initial rate adaptation.80 11.6.2.3 Multi-channel set multiplexing.81 11.6.2.4 Segmentation of Multiplexed Data Units (MDU).82 11.6.2.5 Frame sequencing and addition of control and fill octets.83 11.6.2.6 Frame transmission.84 11.6.3 Unprotected service operation.85 SIST EN 300 175-4 V1.7.1:2003

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11.6.3.1 General.85 11.6.3.2 Data buffering and initial rate adaption.85 11.6.3.3 Multi-channel set multiplexing.85 11.6.3.4 Segmentation of MDUs.86 11.6.3.5 Frame transmission.87 11.7 LU6 Secondary Rate AdapTion (SRAT) service.87 11.7.1 General.87 11.8 LU16 ESCape Service (ESC).88 11.8.1 General.88 11.9 LU7 64 kbit/s data bearer service.89 11.9.1 General.89 11.9.2 Physical layer service.89 11.9.3 MAC layer service.89 11.9.4 DLC layer service.89 11.9.4.1 Architectural model.89 11.9.4.1.1 Transmit (Tx) frame buffering.90 11.9.4.1.2 Receive (Rx) frame buffering.90 11.9.4.2 Automatic-Repeat-Request (ARQ) and Forward Error Control (FEC).90 11.9.4.2.1 Control field.91 11.9.4.2.1.1 Format control parameter coding.92 11.9.4.2.1.2 Offset variable V(O).92 11.9.4.2.1.3 Time variables Vn(T).92 11.9.4.2.1.4 Offset number N(O).92 11.9.4.2.1.5 Send state variable V(S).93 11.9.4.2.1.6 Acknowledge state variable V(A).93 11.9.4.2.1.7 Send sequence number N(S).93 11.9.4.2.1.8 Receive state variable V(R).93 11.9.4.2.1.9 Receive sequence number N(R).93 11.9.4.2.2 Information field.93 11.9.4.2.3 ARQ checksum.94 11.9.4.3 Procedures for normal operation.94 11.9.4.3.1 Establishment and synchronization procedures.94 11.9.4.3.2 Active phase.96 11.9.4.3.2.1 Transmitting frames (first time transmission).96 11.9.4.3.2.2 Re-transmitting frames.97 11.9.4.3.2.3 Receiving frames.97 11.9.4.3.2.4 Sending acknowledgements.98 11.9.4.3.2.5 Receiving acknowledgements.98 11.9.4.3.3 Release.98 11.9.4.4 Exceptional procedures.98 11.9.4.4.1 Invalid frame condition.98 11.9.4.4.2 Establishment.98 11.9.4.4.3 Transmitting frames.98 11.9.4.4.4 Receiving frames.
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