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 ITU-T Recommendation X.200 [12] and ITU-T Recommendation X.210 [13]. 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)

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6060 - National Implementation/Publication (Adopted Project)
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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 2.1.1SIST EN 300 175-4 V2.1.1:2008en01-marec-2008SIST EN 300 175-4 V2.1.1:2008SLOVENSKI

SIST EN 300 175-4 V2.1.1:2008

ETSI EN 300 175-4 V2.1.1 (2007-08)European Standard (Telecommunications series) Digital Enhanced Cordless Telecommunications (DECT);Common Interface (CI);Part 4: Data Link Control (DLC) layer
SIST EN 300 175-4 V2.1.1:2008

ETSI ETSI EN 300 175-4 V2.1.1 (2007-08) 2
Reference REN/DECT-000241-4 Keywords DECT, IMT-2000, mobility, radio, TDD, TDMA ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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ETSI ETSI EN 300 175-4 V2.1.1 (2007-08) 3
Contents Intellectual Property Rights.11 Foreword.11 1 Scope.12 2 References.13 3 Definitions, symbols and abbreviations.14 3.1 Definitions.14 3.2 Symbols.14 3.3 Abbreviations.14 4 Data Link Control (DLC) layer overview.16 4.1 General.16 4.2 C-plane services.16 4.3 U-plane services.17 4.4 Lower Layer Management Entity (LLME).20 5 C-plane service characteristics.20 5.1 Data link service (LAPC+Lc).20 5.1.1 General.20 5.1.2 LAPC types of operation.21 5.1.3 Establishment of information transfer modes.21 Data Link Identifier (DLI).21 LAPC states.21 5.2 Broadcast service (Lb).22 6 Frame structures for C-plane services.23 6.1 Data link service frame structure.23 6.1.1 General frame structure.23 6.1.2 Lc frame delimiting and transparency.24 6.1.3 Transmission order.24 6.1.4 Routing to logical channels.24 CF/CLF logical channel.24 CS/CLS logical channel.25 6.1.5 Invalid frames.25 6.2 Broadcast service frame structure.26 6.2.1 Standard frame structure.26 6.2.2 Extended frame structure.26 7 Elements of procedures and formats of fields for C-plane peer-to-peer communication.27 7.1 General.27 7.2 Address field formats.27 7.3 Address field parameters.27 7.3.1 REServed bit (RES).27 7.3.2 Command Response (C/R) bit.27 7.3.3 SAPI field.27 7.3.4 New Link Flag (NLF) bit.28 7.3.5 LLN-field.28 7.3.6 Data Link Identifiers (DLI).28 7.4 Control field formats.28 7.5 Control field parameters.29 7.5.1 Poll/Final (P/F) bit.29 7.5.2 Multiple frame operation variables and sequence numbers.29 Modulus.29 Send state Variable V(S).29 Acknowledge state Variable V(A).30 Send sequence Number N(S).30 Receive state Variable V(R).30 SIST EN 300 175-4 V2.1.1:2008

ETSI ETSI EN 300 175-4 V2.1.1 (2007-08) 4 Receive sequence Number N(R).30 7.5.3 Unacknowledged operation variables and sequence numbers.30 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.31 7.7.1 Length indicator field extension bit (N).31 7.7.2 More data bit (M).31 7.7.3 Length parameter (LI).31 7.7.4 Extended length parameter (LJJ).32 7.7.5 Reserved bit (RES).32 7.8 Fill field format.32 7.9 Checksum field format.32 7.10 Checksum field parameters.32 7.11 Commands and responses.33 7.11.1 Information (I) command.34 7.11.2 Receive Ready (RR) command/response.34 7.11.3 Receive Not Ready (RNR) command/response.35 7.11.4 REJect (REJ) command/response.35 7.11.5 Set Asynchronous Balanced Mode (SABM) command.35 7.11.6 Disconnect Mode (DM) response.35 7.11.7 Unnumbered Information (UI) command.35 7.11.8 DISConnect (DISC) command.36 7.11.9 Unnumbered ACK (UA) response.36 8 Primitives.36 8.1 Primitive types.36 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.37 8.3.2 S-SAP primitives.38 DL_ESTABLISH primitive.38 DL_RELEASE primitive.38 DL_DATA primitive.39 DL_UNIT_DATA primitive.39 DL_SUSPEND primitive.39 DL_RESUME primitive.39 DL_ENC_KEY primitive.40 DL_ENCRYPT primitive.40 DL_SERVICE_MOD primitive.40 8.3.3 B-SAP primitives.40 DL_BROADCAST primitive.41 DL_EXPEDITED primitive.41 8.4 Primitives to the interworking unit.41 8.4.1 Parameter definitions.41 8.4.2 LUX-SAP primitives.42 DL_U_DATA primitive.42 DL_U_UNIT_DATA primitive.42 DL_U_ERROR primitive.42 9 C-plane peer-to-peer procedures.43 9.1 General.43 9.2 Point to point acknowledged operation.43 9.2.1 Procedure for the use of the P/F bit.43 Class A acknowledged information transfer.43 Class B acknowledged information transfer.44 9.2.2 Use of LLN.44 Class A operation.44 Class B operation.44 9.2.3 Link establishment and information transfer in class A operation.44 Establishing class A operation.44 Class A acknowledged information transfer.45 Transmission of class A I-frames.45 SIST EN 300 175-4 V2.1.1:2008

ETSI ETSI EN 300 175-4 V2.1.1 (2007-08) 5 Reception of class A I-frames.46 Receiving acknowledgements.46 Waiting for acknowledgement.46 Release of class A operation.47 Re-establishment of class A operation.47 9.2.4 Establishing class B multiple frame operation.47 Overview.47 Class B multiple frame establishment procedures.48 Class B LLN assignment procedures.49 PT establishment.49 FT establishment.50 9.2.5 Link maintenance and information transfer in class B multiple frame operation.50 Transmitting I-frames.50 Receiving I-frames.51 P bit set to 1.51 P bit set to 0.51 Sending and receiving acknowledgements.51 Sending acknowledgements.51 Receiving acknowledgements.51 Receiving REJ-frames.52 Receiving RNR-frames.53 LAPC own receiver busy condition.54 Waiting acknowledgement.54 Appropriate supervisory frame.55 9.2.6 Release of class B multiple frame operation.55 9.2.7 Link suspension and resumption.56 Link suspension.56 Class B acknowledged suspend.56 Unacknowledged suspend.57 Class B link resumption.58 Connection handover.59 Class A connection handover.60 Class B connection handover.61 Expiry of connection handover timer.61 9.2.8 Re-establishment of class B multi-frame operation.61 Criteria for re-establishment.61 Procedure.62 9.2.9 Exception handling.62 General.62 Class B exception condition reporting and recovery.63 N(S) sequence error.63 N(R) sequence error.63 Timer recovery condition.63 Collision of identical transmitted and received commands.63 9.3 Unacknowledged operation.64 9.3.1 Use of LLN for unacknowledged information transfer.64 9.3.2 Class U link establishment.64 9.3.3 Unacknowledged information transfer.64 Transmission of unacknowledged information.64 Reception of unacknowledged information.64 9.3.4 Unacknowledged release.64 9.4 Broadcast operation.65 9.4.1 Normal operation.65 Procedure in the Fixed radio Termination (FT).65 Procedure in the Portable radio Termination (PT).65 9.4.2 Expedited operation.65 Procedure in the Fixed radio Termination (FT).65 Procedure in the Portable radio Termination (PT).65 9.5 MAC layer interfaces.66 9.5.1 MC-SAP.66 C-plane overview.66 C-plane service data procedures.66 SIST EN 300 175-4 V2.1.1:2008

ETSI ETSI EN 300 175-4 V2.1.1 (2007-08) 6 U-plane service data.67 9.5.2 MB-SAP.67 C-plane service data procedures.67 U-plane service data.

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