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Data-Over-Cable Service Interface Specifications

DOCSIS 3.0

MAC and Upper Layer Protocols Interface

Specification

CM-SP-MULPIv3.0-I11-091002

Issued

Notice

This DOCSIS specification is the result of a cooperative effort

undertaken at the direction of Cable Television Laboratories, Inc. for the

benefit of the cable industry and its customers. This document may

contain references to other documents not owned or controlled by

CableLabs. Use and understanding of this document may require

access to such other documents. Designing, manufacturing, distributing,

using, selling, or servicing products, or providing services, based on this

document may require intellectual property licenses from third parties for

technology referenced in this document.

Neither CableLabs nor any member company is responsible to any party

for any liability of any nature whatsoever resulting from or arising out of

use or reliance upon this document, or any document referenced herein.

This document is furnished on an "AS IS" basis and neither CableLabs

nor its members provides any representation or warranty, express or

implied, regarding the accuracy, completeness, noninfringement, or

fitness for a particular purpose of this document, or any document

referenced herein.

MAC and Upper Layer Protocols Interface Specification CM-SP-MULPIv3.0-I11-091002

10/02/09 CableLabs

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Contents

1 SCOPE..................................................................................................................................................................1

1.1 Introduction and Purpose...............................................................................................................................1

1.2 Background....................................................................................................................................................1

1.2.1 Broadband Access Network...................................................................................................................1

1.2.2 DOCSIS Network and System Architecture...........................................................................................1

1.2.3 Service Goals.........................................................................................................................................2

1.2.4 Statement of Compatibility ....................................................................................................................3

1.2.5 Reference Architecture ..........................................................................................................................3

1.2.6 DOCSIS 3.0 Documents ........................................................................................................................4

1.3 Requirements.................................................................................................................................................4

1.4 Conventions...................................................................................................................................................5

1.5 Organization of Document ............................................................................................................................5

2 REFERENCES ....................................................................................................................................................6

2.1 Normative References ...................................................................................................................................6

2.2 Informative References..................................................................................................................................9

2.3 Reference Acquisition ...................................................................................................................................9

3 TERMS AND DEFINITIONS..........................................................................................................................10

4 ABBREVIATIONS AND ACRONYMS..........................................................................................................22

5 OVERVIEW AND THEORY OF OPERATIONS.........................................................................................28

5.1 DOCSIS 3.0 MULPI Key Features .............................................................................................................28

5.2 Technical Overview.....................................................................................................................................28

5.2.1 CMTS and CM Models ........................................................................................................................29

5.2.2 DOCSIS MAC Operation.....................................................................................................................33

5.2.3 Multicast Operation.............................................................................................................................39

5.2.4 Network and Higher Layer Protocols..................................................................................................40

5.2.5 CM and CPE Provisioning and Management .....................................................................................40

5.2.6 Relationship to the Physical HFC Plant Topology..............................................................................41

5.2.7 Cable Modem Service Group (CM-SG)...............................................................................................44

5.2.8 CMTS Downstream Service Model Example.......................................................................................49

6 MEDIA ACCESS CONTROL SPECIFICATION.........................................................................................52

6.1 Introduction .................................................................................................................................................52

6.1.1 Overview..............................................................................................................................................52

6.1.2 Definitions ...........................................................................................................................................52

6.1.3 Future Use...........................................................................................................................................56

6.2 MAC Frame Formats...................................................................................................................................56

6.2.1 Generic MAC Frame Format ..............................................................................................................56

6.2.2 Packet-Based MAC Frames.................................................................................................................61

6.2.3 ATM Cell MAC Frames.......................................................................................................................62

6.2.4 MAC-Specific Headers ........................................................................................................................62

6.2.5 Extended MAC Headers ......................................................................................................................68

6.3 Segment Header Format ..............................................................................................................................75

6.4 MAC Management Messages......................................................................................................................76

6.4.1 MAC Management Message Header...................................................................................................76

6.4.2 Time Synchronization (SYNC).............................................................................................................79

6.4.3 Upstream Channel Descriptor (UCD).................................................................................................80

6.4.4 Upstream Bandwidth Allocation Map (MAP)......................................................................................91

CM-SP-MULPIv3.0-I11-091002 Data-Over-Cable Service Interface Specifications

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6.4.5 Ranging Request Messages..................................................................................................................94

6.4.6 Ranging Response (RNG-RSP)............................................................................................................99

6.4.7 Registration Request Messages .........................................................................................................106

6.4.8 Registration Response Messages.......................................................................................................109

6.4.9 Registration Acknowledge (REG-ACK).............................................................................................114

6.4.10 Upstream Channel Change Request (UCC-REQ).............................................................................116

6.4.11 Upstream Channel Change Response (UCC-RSP)............................................................................116

6.4.12 Dynamic Service Addition — Request (DSA-REQ)...........................................................................117

6.4.13 Dynamic Service Addition — Response (DSA-RSP)..........................................................................118

6.4.14 Dynamic Service Addition — Acknowledge (DSA-ACK)...................................................................120

6.4.15 Dynamic Service Change — Request (DSC-REQ) ............................................................................121

6.4.16 Dynamic Service Change — Response (DSC-RSP)...........................................................................123

6.4.17 Dynamic Service Change — Acknowledge (DSC-ACK)....................................................................125

6.4.18 Dynamic Service Deletion — Request (DSD-REQ)...........................................................................126

6.4.19 Dynamic Service Deletion – Response (DSD-RSP)...........................................................................127

6.4.20 Dynamic Channel Change – Request (DCC-REQ) ...........................................................................127

6.4.21 Dynamic Channel Change – Response (DCC-RSP)..........................................................................135

6.4.22 Dynamic Channel Change – Acknowledge (DCC-ACK)...................................................................137

6.4.23 Device Class Identification Request (DCI-REQ)...............................................................................137

6.4.24 Device Class Identification Response (DCI-RSP).............................................................................138

6.4.25 Upstream Transmitter Disable (UP-DIS)..........................................................................................139

6.4.26 Test Request (TST-REQ)....................................................................................................................141

6.4.27 Downstream Channel Descriptor (DCD)..........................................................................................142

6.4.28 MAC Domain Descriptor (MDD)......................................................................................................142

6.4.29 Dynamic Bonding Change Request (DBC-REQ)...............................................................................153

6.4.30 Dynamic Bonding Change Response (DBC-RSP).............................................................................154

6.4.31 Dynamic Bonding Change Acknowledge (DBC-ACK)......................................................................156

6.4.32 DOCSIS Path Verify Request (DPV-REQ)........................................................................................156

6.4.33 DOCSIS Path Verify Response (DPV-RSP).......................................................................................158

6.4.34 Status Report (CM-STATUS).............................................................................................................159

6.4.35 CM Control Request (CM-CTRL-REQ).............................................................................................160

6.4.36 CM Control Response (CM-CTRL-RSP) ...........................................................................................162

7 MEDIA ACCESS CONTROL PROTOCOL OPERATION.......................................................................163

7.1 Timing and Synchronization......................................................................................................................163

7.1.1 Global Timing Reference...................................................................................................................163

7.1.2 CM Synchronization ..........................................................................................................................163

7.1.3 Ranging..............................................................................................................................................164

7.1.4 Timing Units and Relationships.........................................................................................................165

7.2 Upstream Data Transmission.....................................................................................................................167

7.2.1 Upstream Bandwidth Allocation........................................................................................................167

7.2.2 Upstream Transmission and Contention Resolution .........................................................................182

7.2.3 Upstream Service Flow Scheduling Services.....................................................................................187

7.2.4 Continuous Concatenation and Fragmentation ................................................................................191

7.2.5 Pre-3.0 DOCSIS Concatenation and Fragmentation........................................................................192

7.3 Upstream – Downstream Channel Association within a MAC Domain....................................................202

7.3.1 Primary Downstream Channels .......................................................................................................202

7.3.2 MAP and UCD Messages..................................................................................................................203

7.4 DSID Definition ........................................................................................................................................203

7.5 Quality of Service......................................................................................................................................204

7.5.1 Concepts ............................................................................................................................................204

7.5.2 Object Model .....................................................................................................................................209

7.5.3 Service Classes ..................................................................................................................................211

7.5.4 Authorization .....................................................................................................................................212

7.5.5 States of Service Flows......................................................................................................................213

MAC and Upper Layer Protocols Interface Specification CM-SP-MULPIv3.0-I11-091002

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7.5.6 Service Flows and Classifiers............................................................................................................215

7.5.7 General Operation.............................................................................................................................216

7.5.8 QoS Support for Joined IP Multicast Traffic.....................................................................................219

7.5.9 Other Multicast and Broadcast Traffic..............................................................................................232

7.6 Downstream Traffic Priority......................................................................................................................232

7.6.1 Traffic Priority Ordering and Mapping to CM Output Queues ........................................................233

7.7 Payload Header Suppression .....................................................................................................................233

7.7.1 Overview............................................................................................................................................234

7.7.2 Example Applications........................................................................................................................236

7.7.3 Operation...........................................................................................................................................236

7.7.4 Signaling............................................................................................................................................238

7.7.5 Payload Header Suppression Examples............................................................................................241

7.8 Data Link Encryption Support...................................................................................................................243

7.8.1 MAC Messages ..................................................................................................................................243

7.8.2 Framing .............................................................................................................................................243

7.8.3 Multiple Transmit Channel Mode Operation and Packet Encryption...............................................244

8 CHANNEL BONDING...................................................................................................................................245

8.1 Upstream and Downstream Common Aspects ..........................................................................................245

8.1.1 Service Flow Assignment...................................................................................................................245

8.1.2 CMTS Bonding and Topology Requirements ....................................................................................249

8.2 Downstream Channel Bonding..................................................................................................................250

8.2.1 Multiple Downstream Channel Overview..........................................................................................250

8.2.2 CMTS Downstream Bonding Operation............................................................................................251

8.2.3 Sequenced Downstream Packets .......................................................................................................252

8.2.4 Cable Modem Physical Receive Channel Configuration...................................................................257

8.2.5 QoS for Downstream Channel Bonding ............................................................................................265

8.3 Upstream Channel Bonding.......................................................................................................................265

8.3.1 Granting Bandwidth ..........................................................................................................................265

8.3.2 Upstream Transmissions with Upstream Channel Bonding..............................................................265

8.3.3 Dynamic Range Window....................................................................................................................266

8.4 Partial Service............................................................................................................................................269

9 DATA FORWARDING ..................................................................................................................................271

9.1 General Forwarding Requirements............................................................................................................271

9.1.1 CMTS Forwarding Rules...................................................................................................................272

9.1.2 CM Address Acquisition, Filtering and Forwarding Rules...............................................................274

9.2 Multicast Forwarding ................................................................................................................................277

9.2.1 Introduction .......................................................................................................................................277

9.2.2 Downstream Multicast Forwarding...................................................................................................279

9.2.3 Downstream Multicast Traffic Encryption ........................................................................................286

9.2.4 Static Multicast Session Encodings ...................................................................................................288

9.2.5 IGMP and MLD Support...................................................................................................................288

9.2.6 Encrypted Multicast Downstream Forwarding Example ..................................................................292

9.2.7 IP Multicast Join Authorization.........................................................................................................295

10 CABLE MODEM - CMTS INTERACTION............................................................................................300

10.1 CMTS Initialization ...................................................................................................................................300

10.2 Cable Modem Initialization and Reinitialization.......................................................................................300

10.2.1 Scan for Downstream Channel..........................................................................................................301

10.2.2 Continue Downstream Scanning .......................................................................................................301

10.2.3 Service Group Discovery and Initial Ranging...................................................................................301

10.2.4 Authentication....................................................................................................................................325

10.2.5 Establishing IP Connectivity .............................................................................................................325

10.2.6 Registration with the CMTS...............................................................................................................345