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41713559 radio-access-network-protocols-and-signalling-analysis

  1. 1. Chapter 1 UTRAN Interface Protocols and Functions ................................. 1-1 1.1 Overview ................................................................................................ 1-1 1.2 Uu Interface ............................................................................................ 1-2 1.2.1 Uu Protocol Structure..................................................................... 1-2 1.2.2 RRC Functions ............................................................................... 1-4 1.2.3 L2 Functions .................................................................................. 1-5 1.2.4 L1 Functions .................................................................................. 1-6 1.3 Iub interface ............................................................................................ 1-6 1.3.1 Iub Protocol Structure .................................................................... 1-6 1.3.2 Functions of NBAP ......................................................................... 1-8 1.3.3 NBAP Procedures .......................................................................... 1-8 1.3.4 Iub FP for Common Transport Channel Data Transfer .................. 1-10 1.3.5 Iub FP for Dedicated Transport Channel Data Transfer ................ 1-14 1.4 Iur Interface ............................................................................................ 1-18 1.4.1 Iur Protocol Structure ..................................................................... 1-18 1.4.2 Functions of RNSAP ...................................................................... 1-19 1.4.3 RNSAP Procedures ....................................................................... 1-20 1.4.4 Iur FP for Transport Channel Data Transfer .................................. 1-22 1.5 Iu Interface ............................................................................................. 1-22 1.5.1 Iu Protocol Architecture.................................................................. 1-22 1.5.2 Functions of RANAP ...................................................................... 1-25 1.5.3 RANAP Procedures ....................................................................... 1-26 1.5.4 Functions of Iu UP ......................................................................... 1-28 1.5.5 GTP-U ............................................................................................ 1-33 1.5.6 Functions of SABP ......................................................................... 1-33Chapter 2 Transport Network Layer Procedure Analysis ............................ 2-1 2.1 Overview ................................................................................................ 2-1 2.2 SAAL ...................................................................................................... 2-1 2.2.1 Overview ........................................................................................ 2-1 2.2.2 SSCOP .......................................................................................... 2-2 2.2.3 SSCF ............................................................................................. 2-7 2.2.4 CPCS ............................................................................................. 2-8 2.2.5 SAR................................................................................................ 2-8 2.2.6 LM .................................................................................................. 2-9 2.2.7 SSCOP Message ........................................................................... 2-10 2.3 MTP3-B .................................................................................................. 2-11 2.3.1 Overview ........................................................................................ 2-11 2.3.2 Function ......................................................................................... 2-12 2.3.3 Message Structure ......................................................................... 2-14
  2. 2. 2.3.4 Changeover/Changeback/ Management prohibit .......................... 2-19 2.3.5 Signaling Network Management and Status of Signaling Link ...... 2-20 2.3.6 Signaling Network Management and Signaling Route Status ....... 2-22 2.3.7 MTP3-B Upper User Message ....................................................... 2-23 2.3.8 MTP3-B Test Message .................................................................. 2-24 2.3.9 MTP3-B Management Message .................................................... 2-25 2.4 ALCAP .................................................................................................... 2-26 2.4.1 Overview ........................................................................................ 2-26 2.4.2 Function ......................................................................................... 2-27 2.4.3 Message structure ......................................................................... 2-29 2.4.4 Establish Request Message .......................................................... 2-30 2.5 SCCP ..................................................................................................... 2-31 2.5.1 Overview ........................................................................................ 2-31 2.5.2 Function ......................................................................................... 2-32 2.5.3 Message Structure ......................................................................... 2-33 2.5.4 Connection Request Message ....................................................... 2-34Chapter 3 Cell Related Procedure Analysis .................................................. 3-1 3.1 Overview ................................................................................................ 3-1 3.2 Procedures Involved in Cell Setup ......................................................... 3-1 3.2.1 Resource Status Indication Procedure .......................................... 3-1 3.2.2 Resource Audit Procedure ............................................................. 3-2 3.2.3 Cell Setup Procedure ..................................................................... 3-3 3.2.4 Common Transport Channel Setup Procedure.............................. 3-4 3.2.5 Iub Interface User Plane Setup ...................................................... 3-4 3.2.6 System Information Update ........................................................... 3-5 3.2.7 Common Measurement Initiation Procedure ................................. 3-5 3.2.8 Cell Reconfiguration Procedure ..................................................... 3-6 3.2.9 Cell Deletion Procedure ................................................................. 3-7 3.2.10 Resource Status Indication Message .......................................... 3-7 3.2.11 Audit Response Message ............................................................ 3-12 3.2.12 Cell Setup Request Message ...................................................... 3-16 3.2.13 Common Transport Channel Setup Request Message ............... 3-20 3.2.14 System Information Update Request Message ........................... 3-25 3.3 Example of Cell Setup Procedures ........................................................ 3-28Chapter 4 System Information Procedure Analysis ..................................... 4-1 4.1 Overview ................................................................................................ 4-1 4.1.1 System Information Structure ........................................................ 4-1 4.1.2 System Information Monitoring Mechanism ................................... 4-2 4.1.3 Functions of System Information ................................................... 4-2
  3. 3. 4.2 System Information Broadcast and Update ............................................ 4-3 4.2.1 System Information Broadcast ....................................................... 4-3 4.2.2 System Information Update ........................................................... 4-3 4.2.3 System Information Message ........................................................ 4-4 4.3 System Information Modification ............................................................ 4-6 4.3.1 Modification by a value tag ............................................................ 4-7 4.3.2 Modification by a timer ................................................................... 4-7 4.3.3 Paging Type 1 Message ................................................................ 4-7Chapter 5 Call Setup and Release Procedure Analysis ............................... 5-1 5.1 Overview ................................................................................................ 5-1 5.2 Paging .................................................................................................... 5-1 5.2.1 Overview ........................................................................................ 5-1 5.2.2 Paging for UEs in Idle Mode or in PCH State ................................ 5-2 5.2.3 Paging for UEs in CELL_DCH or CELL_FACH State .................... 5-3 5.2.4 Paging Type 1 Message ................................................................ 5-3 5.2.5 Paging Type 2 Message ................................................................ 5-4 5.3 RRC Connection Setup .......................................................................... 5-5 5.3.1 Overview ........................................................................................ 5-5 5.3.2 RRC Connection Setup on Dedicated Channel ............................. 5-6 5.3.3 RRC Connection Setup on Common Channel ............................... 5-7 5.3.4 RRC Connection Reject ................................................................. 5-7 5.3.5 RRC Connection Request Message .............................................. 5-8 5.3.6 RRC Connection Setup Message .................................................. 5-10 5.3.7 RRC Connection Reject Message ................................................. 5-13 5.3.8 Radio Link Setup Request Message .............................................. 5-14 5.4 Direct Transfer Messages ...................................................................... 5-18 5.4.1 Overview ........................................................................................ 5-18 5.4.2 Initial Direct Transfer ...................................................................... 5-18 5.4.3 Uplink Direct Transfer .................................................................... 5-19 5.4.4 Downlink Direct Transfer ................................................................ 5-20 5.4.5 Initial Direct Transfer Message ...................................................... 5-21 5.4.6 Uplink Direct Transfer Message ..................................................... 5-22 5.4.7 Downlink Direct Transfer Message ................................................ 5-23 5.5 UE Capability Information ....................................................................... 5-24 5.5.1 UE Capability Enquiry .................................................................... 5-25 5.5.2 UE Capability Information Update .................................................. 5-25 5.6 RAB Setup .............................................................................................. 5-26 5.6.1 Overview ........................................................................................ 5-26 5.6.2 DCH-DCH ...................................................................................... 5-27 5.6.3 CCH-DCH ...................................................................................... 5-30
  4. 4. 5.6.4 CCH-CCH ...................................................................................... 5-32 5.6.5 RAB Assignment Request Message .............................................. 5-33 5.6.6 RAB Assignment Response Message ........................................... 5-36 5.6.7 Radio Bearer Setup Message ........................................................ 5-38 5.7 Call Release ........................................................................................... 5-43 5.7.1 Overview ........................................................................................ 5-43 5.7.2 Iu Signaling Connection Release ................................................... 5-44 5.7.3 RAB Release ................................................................................. 5-45 5.7.4 Combined Release of CS Domain Iu Signaling Link and RAB ...... 5-47 5.7.5 RRC Connection Release .............................................................. 5-48Chapter 6 Mobility Management Procedure Analysis .................................. 6-1 6.1 Overview ................................................................................................ 6-1 6.2 Forward handover .................................................................................. 6-1 6.2.1 Overview ........................................................................................ 6-1 6.2.2 Cell Update .................................................................................... 6-1 6.2.3 URA Update ................................................................................... 6-3 6.2.4 Cell Update Message..................................................................... 6-4 6.2.5 URA Update Message ................................................................... 6-6 6.3 Soft Handover ........................................................................................ 6-8 6.3.1 Overview ........................................................................................ 6-8 6.3.2 Radio Link Addition ........................................................................ 6-9 6.3.3 Radio Link Deletion ........................................................................ 6-10 6.3.4 Radio Link Addition and Deletion ................................................... 6-12 6.3.5 Radio Link Setup Request Message .............................................. 6-13 6.3.6 Active Set Update Message ........................................................... 6-13 6.4 Hard Handover ....................................................................................... 6-15 6.4.1 Overview ........................................................................................ 6-15 6.4.2 Compressed Mode ......................................................................... 6-16 6.4.3 Iur Interface Hard Handover .......................................................... 6-17 6.4.4 Combined Hard Handover ............................................................. 6-19 6.4.5 Radio Link Setup Request Message .............................................. 6-22 6.4.6 Physical Channel Reconfiguration Message ................................. 6-22 6.5 Inter-RAT Handover ............................................................................... 6-24 6.5.1 Overview ........................................................................................ 6-24 6.5.2 WCDMA->GSM Inter-RAT Handover ............................................ 6-25 6.5.3 GSM->WCDMA Inter-RAT Handover ............................................ 6-27 6.5.4 GSM/GPRS->WCDMA Cell Reselection ....................................... 6-29 6.5.5 WCDMA->GSM/GPRS Cell Reselection ....................................... 6-29 6.5.6 Handover from UTRAN Command Message................................. 6-32 6.5.7 Handover to UTRAN Command Message ..................................... 6-33
  5. 5. 6.6 Relocation .............................................................................................. 6-35 6.6.1 Overview ........................................................................................ 6-35 6.6.2 Static Relocation ............................................................................ 6-35 6.6.3 Relocation with Hard Handover ..................................................... 6-39 6.6.4 Relocation with Forward Handover ................................................ 6-41 6.6.5 Relocation Required Message ....................................................... 6-42 6.6.6 Relocation Request Message ........................................................ 6-45 6.6.7 Relocation Command Message ..................................................... 6-46 6.6.8 UTRAN Mobility Information Message ........................................... 6-49 6.6.9 Uplink Signaling Transfer Indication Message ............................... 6-51Chapter 7 Dynamic Resource Control Procedure Analysis ........................ 7-1 7.1 Overview ................................................................................................ 7-1 7.2 RAB Modification .................................................................................... 7-1 7.2.1 Overview ........................................................................................ 7-1 7.2.2 RAB Modification (DCH-DCH) ....................................................... 7-1 7.2.3 RAB Assignment Request Message .............................................. 7-3 7.2.4 Radio Bearer Reconfiguration Message ........................................ 7-3 7.3 Dynamic Channel Reconfiguration ......................................................... 7-6 7.3.1 Overview ........................................................................................ 7-6 7.3.2 RB Reconfiguration ........................................................................ 7-7 7.3.3 Radio Bearer Reconfiguration Message ........................................ 7-8Appendix A Tracing Tools .............................................................................. A-1 A.1 About Tracing Tools ............................................................................... A-1 A.1.1 RNC Tracing Tool .......................................................................... A-1 A.1.2 NodeB Tracing Tool ....................................................................... A-1Appendix B Call Example ............................................................................... B-1 B.1 Overview ................................................................................................ B-1 B.2 Originating Call Procedure ..................................................................... B-1 B.3 Terminated Call procedure .................................................................... B-4Appendix C Acronyms and Abbreviations .................................................... C-1Index .................................................................................................................
  6. 6. HUAWEIHUAWEI UMTS Radio Access NetworkProtocols and Signalling Analysis
  7. 7. HUAWEI UMTS Radio Access NetworkProtocols and Signalling AnalysisManual Version T2-030223-20041001-C-1.22Product Version BSC6800V100R002 NodeB V100R003BOM 31026523 Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. Please feel free to contact our local office or company headquarters. Huawei Technologies Co., Ltd. Address: Administration Building, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen, P. R. China Postal Code: 518129 Website: http://www.huawei.com Email: support@huawei.com
  8. 8. Copyright © 2004 Huawei Technologies Co., Ltd. All Rights Reserved No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks , HUAWEI, C&C08, EAST8000, HONET, , ViewPoint, INtess, ETS, DMC, TELLIN, InfoLink, Netkey, Quidway, SYNLOCK, Radium, M900/M1800, TELESIGHT, Quidview, Musa, Airbridge, Tellwin, Inmedia, VRP, DOPRA, iTELLIN, HUAWEI OptiX, C&C08 iNET, NETENGINE, OptiX, iSite, U-SYS, iMUSE, OpenEye, Lansway, SmartAX, infoX, TopEng are trademarks of Huawei Technologies Co., Ltd. All other trademarks mentioned in this manual are the property of their respective holders. Notice The information in this manual is subject to change without notice. Every effort has been made in the preparation of this manual to ensure accuracy of the contents, but all statements, information, and recommendations in this manual do not constitute the warranty of any kind, express or implied.
  9. 9. Summary of Updates This section provides the update history of this manual and introduces the contents of subsequent updates.Update History This manual is updated for a major product version to maintain consistency with system hardware or software versions and to incorporate customer suggestions. Manual Version Notes T2-030223-20041001-C-1.22 Initial commercial releaseUpdates of Contents None
  10. 10. About This ManualRelease Notes This manual applies to BSC6800 V100R002 and NodeB V100R003.Organization The manual analyzes protocols and signaling of radio access network in UMTS. There are 7 chapters and 3 appendixes in the manual. Chapter 1 UTRAN Interface Protocols and Functions profiles the interfaces, functions and the corresponding protocols in the radio access network of UMTS. The user planes of Iub/Iur/Iu interfaces are described in this chapter. Chapter 2 Transport Network Layer Procedure Analysis analyzes the signalling procedures of transport network layer and describes the functions of entities in the transport network signalling layer. Chapter 3 Cell Related Procedure Analysis analyzes the cell-related procedures, such as cell setup, common channel setup and a whole cell setup procedure example is presented. Chapter 4 System Information Procedure Analysis analyzes the system information procedures. Chapter 5 Call Setup and Release Procedure Analysis mainly analyzed the procedures of RRC connection setup and release, of RAB setup and release. Chapter 6 Mobility Management Procedure Analysis analyzes the procedures of forward handover, soft handover, hard handover, Inter-Rat handover and SRNS relocation. Chapter 7 Dynamic Resource Control Procedure Analysis analyzes the procedures of RAB modification and dynamic channel reconfiguration. Appendix A Tracing Tools introduce the message tracing tools. Appendix B Call Example presents a whole typical call procedure example. Appendix C Acronyms and AbbreviationsIntended Audience
  11. 11. The manual is intended for the following readers: Technical marketing specialists Operation and maintenance personnelConventions The manual uses the following conventions: I. General conventions Convention Description Arial Normal paragraphs are in Arial. Arial Narrow Warnings, Cautions, Notes and Tips are in Arial Narrow. Boldface Headings are in Boldface. Courier New Terminal Display is in Courier New. II. Symbols Eye-catching symbols are also used in the manual to highlight the points worthy of special attention during the operation. They are defined as follows: Caution, Warning, Danger: Means reader be extremely careful during the operation. Note, Comment, Tip, Knowhow, Thought: Means a complementary description.
  12. 12. Protocols and Signalling AnalysisHUAWEI UMTS Radio Access Network Table of Contents Table of ContentsChapter 1 UTRAN Interface Protocols and Functions............................................................... 1-1 1.1 Overview ............................................................................................................................ 1-1 1.2 Uu Interface ....................................................................................................................... 1-2 1.2.1 Uu Protocol Structure.............................................................................................. 1-2 1.2.2 RRC Functions ........................................................................................................ 1-4 1.2.3 L2 Functions............................................................................................................ 1-5 1.2.4 L1 Functions............................................................................................................ 1-6 1.3 Iub interface ....................................................................................................................... 1-6 1.3.1 Iub Protocol Structure ............................................................................................. 1-6 1.3.2 Functions of NBAP.................................................................................................. 1-8 1.3.3 NBAP Procedures ................................................................................................... 1-8 1.3.4 Iub FP for Common Transport Channel Data Transfer......................................... 1-10 1.3.5 Iub FP for Dedicated Transport Channel Data Transfer ....................................... 1-14 1.4 Iur Interface...................................................................................................................... 1-18 1.4.1 Iur Protocol Structure ............................................................................................ 1-18 1.4.2 Functions of RNSAP ............................................................................................. 1-19 1.4.3 RNSAP Procedures .............................................................................................. 1-20 1.4.4 Iur FP for Transport Channel Data Transfer ......................................................... 1-22 1.5 Iu Interface ....................................................................................................................... 1-22 1.5.1 Iu Protocol Architecture......................................................................................... 1-22 1.5.2 Functions of RANAP ............................................................................................. 1-25 1.5.3 RANAP Procedures .............................................................................................. 1-26 1.5.4 Functions of Iu UP................................................................................................. 1-28 1.5.5 GTP-U ................................................................................................................... 1-33 1.5.6 Functions of SABP ................................................................................................ 1-33Chapter 2 Transport Network Layer Procedure Analysis ......................................................... 2-1 2.1 Overview ............................................................................................................................ 2-1 2.2 SAAL.................................................................................................................................. 2-1 2.2.1 Overview ................................................................................................................. 2-1 2.2.2 SSCOP.................................................................................................................... 2-2 2.2.3 SSCF....................................................................................................................... 2-7 2.2.4 CPCS ...................................................................................................................... 2-8 2.2.5 SAR ......................................................................................................................... 2-8 2.2.6 LM ........................................................................................................................... 2-9 2.2.7 SSCOP Message .................................................................................................. 2-10 2.3 MTP3-B............................................................................................................................ 2-11 2.3.1 Overview ............................................................................................................... 2-11 i
  13. 13. Protocols and Signalling AnalysisHUAWEI UMTS Radio Access Network Table of Contents 2.3.2 Function................................................................................................................. 2-12 2.3.3 Message Structure ................................................................................................ 2-14 2.3.4 Changeover/Changeback/ Management prohibit ................................................. 2-19 2.3.5 Signaling Network Management and Status of Signaling Link ............................. 2-20 2.3.6 Signaling Network Management and Signaling Route Status .............................. 2-22 2.3.7 MTP3-B Upper User Message .............................................................................. 2-23 2.3.8 MTP3-B Test Message ......................................................................................... 2-24 2.3.9 MTP3-B Management Message ........................................................................... 2-25 2.4 ALCAP ............................................................................................................................. 2-26 2.4.1 Overview ............................................................................................................... 2-26 2.4.2 Function................................................................................................................. 2-27 2.4.3 Message structure................................................................................................. 2-29 2.4.4 Establish Request Message.................................................................................. 2-30 2.5 SCCP ............................................................................................................................... 2-31 2.5.1 Overview ............................................................................................................... 2-31 2.5.2 Function................................................................................................................. 2-32 2.5.3 Message Structure ................................................................................................ 2-33 2.5.4 Connection Request Message .............................................................................. 2-34Chapter 3 Cell Related Procedure Analysis ............................................................................... 3-1 3.1 Overview ............................................................................................................................ 3-1 3.2 Procedures Involved in Cell Setup..................................................................................... 3-1 3.2.1 Resource Status Indication Procedure ................................................................... 3-1 3.2.2 Resource Audit Procedure ...................................................................................... 3-2 3.2.3 Cell Setup Procedure .............................................................................................. 3-3 3.2.4 Common Transport Channel Setup Procedure....................................................... 3-4 3.2.5 Iub Interface User Plane Setup ............................................................................... 3-4 3.2.6 System Information Update..................................................................................... 3-5 3.2.7 Common Measurement Initiation Procedure .......................................................... 3-5 3.2.8 Cell Reconfiguration Procedure .............................................................................. 3-6 3.2.9 Cell Deletion Procedure .......................................................................................... 3-7 3.2.10 Resource Status Indication Message ................................................................... 3-7 3.2.11 Audit Response Message ................................................................................... 3-12 3.2.12 Cell Setup Request Message.............................................................................. 3-16 3.2.13 Common Transport Channel Setup Request Message ...................................... 3-20 3.2.14 System Information Update Request Message .................................................. 3-25 3.3 Example of Cell Setup Procedures.................................................................................. 3-28Chapter 4 System Information Procedure Analysis .................................................................. 4-1 4.1 Overview ............................................................................................................................ 4-1 4.1.1 System Information Structure.................................................................................. 4-1 4.1.2 System Information Monitoring Mechanism............................................................ 4-2 4.1.3 Functions of System Information............................................................................. 4-2 4.2 System Information Broadcast and Update....................................................................... 4-3 ii
  14. 14. Protocols and Signalling AnalysisHUAWEI UMTS Radio Access Network Table of Contents 4.2.1 System Information Broadcast ................................................................................ 4-3 4.2.2 System Information Update..................................................................................... 4-3 4.2.3 System Information Message.................................................................................. 4-4 4.3 System Information Modification........................................................................................ 4-6 4.3.1 Modification by a value tag...................................................................................... 4-7 4.3.2 Modification by a timer ............................................................................................ 4-7 4.3.3 Paging Type 1 Message ......................................................................................... 4-7Chapter 5 Call Setup and Release Procedure Analysis ............................................................ 5-1 5.1 Overview ............................................................................................................................ 5-1 5.2 Paging................................................................................................................................ 5-1 5.2.1 Overview ................................................................................................................. 5-1 5.2.2 Paging for UEs in Idle Mode or in PCH State ......................................................... 5-2 5.2.3 Paging for UEs in CELL_DCH or CELL_FACH State............................................. 5-3 5.2.4 Paging Type 1 Message ......................................................................................... 5-3 5.2.5 Paging Type 2 Message ......................................................................................... 5-4 5.3 RRC Connection Setup ..................................................................................................... 5-5 5.3.1 Overview ................................................................................................................. 5-5 5.3.2 RRC Connection Setup on Dedicated Channel ...................................................... 5-6 5.3.3 RRC Connection Setup on Common Channel........................................................ 5-7 5.3.4 RRC Connection Reject .......................................................................................... 5-7 5.3.5 RRC Connection Request Message ....................................................................... 5-8 5.3.6 RRC Connection Setup Message ......................................................................... 5-10 5.3.7 RRC Connection Reject Message ........................................................................ 5-13 5.3.8 Radio Link Setup Request Message..................................................................... 5-14 5.4 Direct Transfer Messages................................................................................................ 5-18 5.4.1 Overview ............................................................................................................... 5-18 5.4.2 Initial Direct Transfer ............................................................................................. 5-18 5.4.3 Uplink Direct Transfer ........................................................................................... 5-19 5.4.4 Downlink Direct Transfer....................................................................................... 5-20 5.4.5 Initial Direct Transfer Message ............................................................................. 5-21 5.4.6 Uplink Direct Transfer Message............................................................................ 5-22 5.4.7 Downlink Direct Transfer Message ....................................................................... 5-23 5.5 UE Capability Information ................................................................................................ 5-24 5.5.1 UE Capability Enquiry ........................................................................................... 5-25 5.5.2 UE Capability Information Update......................................................................... 5-25 5.6 RAB Setup ....................................................................................................................... 5-26 5.6.1 Overview ............................................................................................................... 5-26 5.6.2 DCH-DCH.............................................................................................................. 5-27 5.6.3 CCH-DCH.............................................................................................................. 5-30 5.6.4 CCH-CCH.............................................................................................................. 5-32 5.6.5 RAB Assignment Request Message ..................................................................... 5-33 5.6.6 RAB Assignment Response Message .................................................................. 5-36 iii
  15. 15. Protocols and Signalling AnalysisHUAWEI UMTS Radio Access Network Table of Contents 5.6.7 Radio Bearer Setup Message ............................................................................... 5-38 5.7 Call Release..................................................................................................................... 5-43 5.7.1 Overview ............................................................................................................... 5-43 5.7.2 Iu Signaling Connection Release .......................................................................... 5-44 5.7.3 RAB Release......................................................................................................... 5-45 5.7.4 Combined Release of CS Domain Iu Signaling Link and RAB ............................. 5-47 5.7.5 RRC Connection Release ..................................................................................... 5-48Chapter 6 Mobility Management Procedure Analysis ............................................................... 6-1 6.1 Overview ............................................................................................................................ 6-1 6.2 Forward handover.............................................................................................................. 6-1 6.2.1 Overview ................................................................................................................. 6-1 6.2.2 Cell Update.............................................................................................................. 6-1 6.2.3 URA Update ............................................................................................................ 6-3 6.2.4 Cell Update Message.............................................................................................. 6-4 6.2.5 URA Update Message ............................................................................................ 6-6 6.3 Soft Handover .................................................................................................................... 6-8 6.3.1 Overview ................................................................................................................. 6-8 6.3.2 Radio Link Addition ................................................................................................. 6-9 6.3.3 Radio Link Deletion ............................................................................................... 6-10 6.3.4 Radio Link Addition and Deletion .......................................................................... 6-12 6.3.5 Radio Link Setup Request Message..................................................................... 6-13 6.3.6 Active Set Update Message.................................................................................. 6-13 6.4 Hard Handover................................................................................................................. 6-15 6.4.1 Overview ............................................................................................................... 6-15 6.4.2 Compressed Mode................................................................................................ 6-16 6.4.3 Iur Interface Hard Handover.................................................................................. 6-17 6.4.4 Combined Hard Handover .................................................................................... 6-19 6.4.5 Radio Link Setup Request Message..................................................................... 6-22 6.4.6 Physical Channel Reconfiguration Message ........................................................ 6-22 6.5 Inter-RAT Handover......................................................................................................... 6-24 6.5.1 Overview ............................................................................................................... 6-24 6.5.2 WCDMA->GSM Inter-RAT Handover ................................................................... 6-25 6.5.3 GSM->WCDMA Inter-RAT Handover ................................................................... 6-27 6.5.4 GSM/GPRS->WCDMA Cell Reselection .............................................................. 6-29 6.5.5 WCDMA->GSM/GPRS Cell Reselection .............................................................. 6-29 6.5.6 Handover from UTRAN Command Message........................................................ 6-32 6.5.7 Handover to UTRAN Command Message............................................................ 6-33 6.6 Relocation ........................................................................................................................ 6-35 6.6.1 Overview ............................................................................................................... 6-35 6.6.2 Static Relocation ................................................................................................... 6-35 6.6.3 Relocation with Hard Handover ............................................................................ 6-39 6.6.4 Relocation with Forward Handover ....................................................................... 6-41 iv
  16. 16. Protocols and Signalling AnalysisHUAWEI UMTS Radio Access Network Table of Contents 6.6.5 Relocation Required Message .............................................................................. 6-42 6.6.6 Relocation Request Message ............................................................................... 6-45 6.6.7 Relocation Command Message ............................................................................ 6-46 6.6.8 UTRAN Mobility Information Message.................................................................. 6-49 6.6.9 Uplink Signaling Transfer Indication Message...................................................... 6-51Chapter 7 Dynamic Resource Control Procedure Analysis...................................................... 7-1 7.1 Overview ............................................................................................................................ 7-1 7.2 RAB Modification ............................................................................................................... 7-1 7.2.1 Overview ................................................................................................................. 7-1 7.2.2 RAB Modification (DCH-DCH) ................................................................................ 7-1 7.2.3 RAB Assignment Request Message ....................................................................... 7-3 7.2.4 Radio Bearer Reconfiguration Message ................................................................. 7-3 7.3 Dynamic Channel Reconfiguration .................................................................................... 7-6 7.3.1 Overview ................................................................................................................. 7-6 7.3.2 RB Reconfiguration ................................................................................................. 7-7 7.3.3 Radio Bearer Reconfiguration Message ................................................................. 7-8Appendix A Tracing Tools............................................................................................................A-1 A.1 About Tracing Tools ..........................................................................................................A-1 A.1.1 RNC Tracing Tool ...................................................................................................A-1 A.1.2 NodeB Tracing Tool................................................................................................A-1Appendix B Call Example .............................................................................................................B-1 B.1 Overview............................................................................................................................B-1 B.2 Originating Call Procedure ................................................................................................B-1 B.3 Terminated Call procedure................................................................................................B-4Appendix C Acronyms and Abbreviations .................................................................................C-1Index ................................................................................................................................................ i-1 v
  17. 17. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Chapter 1 UTRAN Interface Protocols and Functions1.1 Overview Figure 1-1 UTRAN interfaces As shown in Figure 1-1, UTRAN interfaces in the UMTS system include Iub, Iur, Iu and Uu interfaces. See Table 1-1 for the description of the interfaces. Table 1-1 UTRAN interfaces Interface Description Uu Logical interface between UTRAN and UE Iub Logical interface between RNC and NodeB Iur Logical interface between RNCs Iu Logical interface between RNC and CN 1-1
  18. 18. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Iub, Iur, Iu and Uu interfaces are standard interfaces and can be used to connect different network elements (NEs) from different vendors. Iub, Iur and Iu interfaces are also called as UTRAN terrestrial interfaces. According to the type of CN entity connected to RNC, the Iu interface can be classified into Iu-CS interface, Iu-PS interface and Iu-BC interface. Iu-CS interface is used to connect RNC and MSC. Iu-PS interface is used to connect RNC and SGSN. The Iu-BC interface is used to connect RNC and CBC.1.2 Uu Interface1.2.1 Uu Protocol Structure Uu interface is the interface between User Equipment (UE) and UMTS Terrestrial Radio Access Network (UTRAN) and it is the most important interface in the UMTS system. As shown in Figure 1-2, Uu interface includes three protocol layers, physical layer (L1), data link layer (L2) and network layer (L3). L1 provides the radio physical channels for the transmission of the traffic from upper layers. The functions of L1 are implemented by NodeB. L2 includes four sublayers, Medium Access Control (MAC), Radio Link Control (RLC), Broadcast/Multicast Control (BMC) and Packet Data Convergence Protocol (PDCP). The functions of L2 are implemented by RNC. L3 includes the RRC sublayer in the access stratum, the Mobility Management (MM) and Call Control (CC) in the non-access stratum. The RRC functions of L3 are implemented by RNC, and the MM and CC functions of L3 are implemented by CN. 1-2
  19. 19. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions GC Nt DC Duplication avoidance GC Nt DC UuS boundary C-plane signalling U-plane information RRC control L3 co co co co Radio ntr ntr ntr ntr Bearers PDCP PDCP L2/PDCP BMC L2/BMC RLC RLC L2/RLC RLC RLC RLC RLC RLC RLC Logical Channels MAC L2/MAC Transport Channels PHY L1 Figure 1-2 Uu interface protocol stack Uu interface specifications are shown in Figure 1-3. 1-3
  20. 20. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions GC Nt DC Duplication avoidance GC Nt DC C-plane signalling U-plane information UuS boundary control L3 TS25.331 TS25.323 L2/PDCP control control control control TS25.324 L2/BMC RLC RLC L2/RLC RLC RLC RLC RLC RLC TS25.322 Logical Channels TS25.321 L2/MAC Transport Channels TS25.211~TS25.215 L1 Figure 1-3 Uu interface specifications1.2.2 RRC Functions The RRC performs the functions listed below : Broadcast of information related to the non-access stratum (Core Network); Broadcast of information related to the access stratum; Establishment, maintenance and release of an RRC connection between the UE and UTRAN; Establishment, reconfiguration and release of Radio Bearers; Assignment, reconfiguration and release of radio resources for the RRC connection; RRC connection mobility functions; Route selection for the Protocol Data Unit (PDU) of upper layers; Control of requested QoS; UE measurement reporting and control of the reporting; Outer loop power control; Control of ciphering; Paging; Initial cell selection and cell re-selection; 1-4
  21. 21. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Arbitration of radio resources on uplink DCH; RRC message integrity protection; CBS control.1.2.3 L2 Functions L2 includes four sublayers, Medium Access Control (MAC), Radio Link Control (RLC), Broadcast/Multicast Control (BMC) and Packet Data Convergence Protocol (PDCP). I. MAC The functions of MAC include: Mapping between logical channels and transport channels Selection of appropriate Transport Format for each Transport Channel Priority handling between data flows of one UE Priority handling between UEs by means of dynamic scheduling Priority handling between data flows of several users on FACH Identification of UEs on common transport channels Multiplexing/demultiplexing of upper layer PDUs into/from transport blocks delivered to/from the physical layer on common transport channels Traffic volume measurement Transport Channel type switching Ciphering for transparent mode RLC Access Service Class selection II. RLC The functions of RLC include: Segmentation and reassembly, concatenation, padding and transfer of user data. Flow control Error correction, in-sequence delivery of upper layer PDUs and duplicate detection Sequence numbers check Protocol error detection and recovery Ciphering Suspend/resume function III. PDCP The functions of PDCP include: Header compression and decompression of IP data streams at the transmitting and receiving entity respectively. Transfer of user data 1-5
  22. 22. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Forward the PDCP-SDU from non-access stratum to RLC, and multiplex different RBs to the same RLC entity. IV. BMC The functions of BMC include: Storage of Cell Broadcast Messages Traffic volume monitoring and radio resource request for CBS Scheduling of BMC messages Transmission of BMC messages to UE Delivery of Cell Broadcast messages to upper layer (NAS)1.2.4 L1 Functions The functions of L1 (physical layer) mainly includes: Measurements and indication to higher layers (e.g. FER, SIR, interference power, transmission power, etc) Macro-diversity distribution/combining and soft handover execution; Frequency and time (chip, bit, slot, frame) synchronization; Closed-loop power control; RF processing; Multiplexing of transport channels and demultiplexing of coded composite transport channels; Mapping of coded composite transport channels on physical channels; Modulation and spreading/demodulation and despreading of physical channels; The detailed functions and relevant specifications of L1 are involved with the basic principles of W-CMDA which is out of the range of this manual. Refer to relevant protocols for the details.1.3 Iub interface1.3.1 Iub Protocol Structure Iub interface is the logical interface between RNC and NodeB. The protocol stack of Iub interface is illustrated in Figure 1-4. 1-6
  23. 23. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Radio Network User Plane Radio Control Plane FACH FP RACH FP DCH FP PCH FP Network Node B Layer Application Part (NBAP) Transport Network Control Plane ALCAP Transport Layer Q.2630.1 Q.2150.2 SSCF-UNI SSCF-UNI SSCOP SSCOP AAL Type 5 AAL Type 5 AAL Type 2 ATM Physical Layer Figure 1-4 Protocol Stack of Iub interface Iub interface specifications are shown in Figure 1-5. Radio Network User Plane Control Plane Dedicated Common Radio NBAP Channels Channels Network TS 25.433 TS 25.427 TS 25.435 Layer Transport Network Control Plane Transport Signaling Transport TS 25.426 Layer (Dedicated Channel Dedicated Common Transport) Channel Channel NBAP Transport Transport Transport TS 25.434 (Common Channel TS 25.432 Transport) TS 25.426 TS 25.434 TS 25.431 Physical Layer Figure 1-5 Iub interface specifications In this section, only the functions and procedures of radio network layer are given. For the transport layer, refer to “Chapter 2 Transfer Network Layer Procedure Analysis”. The radio network user plane of Iub interface is to transfer the data between RNC and NodeB. The plane is implemented by means of Frame Protocol (FP) of transport 1-7
  24. 24. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions channels. According to the type of transported data, the FP can be classified as FP for common transport channel and FP for Dedicated transport channel.1.3.2 Functions of NBAP NBAP is the Radio network control plane of Iub interface, which provides the following functions: Cell Configuration Management. This function gives the CRNC the possibility to manage the cell configuration information in a NodeB. Common Transport Channel Management. This function gives the CRNC the possibility to manage the configuration of Common Transport Channels in a NodeB. System Information Management. This function gives the CRNC the ability to manage the scheduling of System Information to be broadcast in a cell. Resource Event Management. This function gives the NodeB the ability to inform the CRNC about the status of NodeB resources. Configuration Alignment. This function gives the CRNC and the NodeB the possibility to verify and enforce that both nodes have the same information on the configuration of the radio resources. Measurements on Common Resources. This function allows the NodeB to initiate measurements in the NodeB. The function also allows the NodeB to report the result of the measurements. Radio Link Management. This function allows the CRNC to manage radio links using dedicated resources in a NodeB. Radio Link Supervision. This function allows the CRNC to report failures and restorations of a Radio Link. Compressed Mode Control. This function allows the CRNC to control the usage of compressed mode in a NodeB. Measurements on Dedicated Resources. This function allows the CRNC to initiate measurements in the NodeB. The function also allows the NodeB to report the result of the measurements. DL Power Drifting Correction. This function allows the CRNC to adjust the DL power level of one or more Radio Links in order to avoid DL power drifting between the Radio Links. Reporting of General Error Situations. This function allows reporting of general error situations, for which function specific error messages have not been defined.1.3.3 NBAP Procedures NBAP procedures are divided into common procedures and dedicated procedures. 1-8
  25. 25. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions NBAP common procedures are procedures that request initiation of a UE context for a specific UE in NodeB or are not related to a specific UE. NBAP common procedures also incorporate logical O&M procedures. NBAP dedicated procedures are procedures that are related to a specific UE context in NodeB. This UE context is identified by a UE context identity. The two types of procedures may be carried on separate signaling links. I. NBAP Common Procedures The mapping between the NBAP functions and NBAP elementary procedures is shown in the Table 1-2. Table 1-2 Mapping between functions and NBAP elementary procedures Function Elementary Procedure(s) Cell Configuration Management a) Cell Setup b) Cell Reconfiguration c) Cell Deletion Common Transport Channel Management a) Common Transport Channel Setup b) Common Transport Channel Reconfiguration c) Common Transport Channel Deletion System Information Management System Information Update Resource Event Management a) Block Resource b) Unblock Resource c) Resource Status Indication Configuration Alignment a) Audit Required b) Audit c) Reset Measurements on Common Resources a) Common Measurement Initiation b) Common Measurement Reporting c) Common Measurement Termination d) Common Measurement Failure Radio Link Management. Radio Link Setup II. NBAP Dedicated Procedures The mapping between the NBAP functions and NBAP dedicated procedures is shown in Table 1-3. 1-9
  26. 26. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions Table 1-3 Mapping between functions and NBAP dedicated procedures Function Dedicated Procedure(s) Radio Link Management. a) Radio Link Addition b) Radio Link Deletion c) Unsynchronized Radio Link Reconfiguration d) Synchronized Radio Link Reconfiguration Preparation e) Synchronized Radio Link Reconfiguration Commit f) Synchronized Radio Link Reconfiguration Cancellation g) Radio Link Pre-emption Radio Link Supervision. a) Radio Link Failure b) Radio Link Restoration Compressed Mode Control a) Radio Link Setup b) Radio Link Addition c) Compressed Mode Command d) Unsynchronized Radio Link Reconfiguration e) Synchronized Radio Link Reconfiguration Preparation f) Synchronized Radio Link Reconfiguration Commit g) Synchronized Radio Link Reconfiguration Cancellation Measurements on Dedicated Resources a) Dedicated Measurement Initiation b) Dedicated Measurement Reporting c) Dedicated Measurement Termination d) Dedicated Measurement Failure DL Power Drifting Correction Downlink Power Control Reporting of General Error Situations Error Indication1.3.4 Iub FP for Common Transport Channel Data Transfer Iub FP for common transport channel data transfer is the radio network user plane of Iub interface which provides the following services: Transport of Transport Block Set (TBS) between the NodeB and the CRNC for common transport channels (including RACH, FACH PCH) Support of transport channel synchronization mechanism Support of Node Synchronization mechanism I. RACH Data Transfer RACH Data Transfer procedure is used to transfer data received from Uu interface from NodeB to CRNC. 1-10
  27. 27. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions The procedure is realized by a transmission of Data Frame from NodeB to CRNC, as shown in Figure 1-6. NodeB CRNC RACH Data Frame Figure 1-6 RACH data transfer procedure II. FACH Data Transfer FACH Data Transfer procedure is used to transfer data from CRNC to NodeB. The procedure is realized by a transmission of Data Frame from CRNC to NodeB, as shown in Figure 1-7. NodeB CRNC FACH Data Frame Figure 1-7 FACH data transfer procedure III. PCH Data Transfer PCH Data Transfer procedure is used to transfer data from CRNC to NodeB. The procedure is realized by a transmission of Data Frame from CRNC to NodeB, as shown in Figure 1-8. NodeB CRNC PCH Data Frame Figure 1-8 PCH data transfer procedure 1-11
  28. 28. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions IV. Node Synchronization Node synchronization is to obtain the round trip delay (RTD) of the transmission between information entities over the Iub interface. In the Node Synchronization procedure, the RNC sends a DL Node Synchronization control frame to NodeB containing the parameter T1. Upon reception of a DL Node Synchronization control frame, the NodeB shall respond with UL Node Synchronization Control Frame, indicating t2 and t3, as well as t1 which was indicated in the initiating DL Node Synchronization control frame, as shown in Figure 1-9. NodeB CRNC DL Node Synchronization UL Node Synchronization Figure 1-9 Node synchronisation procedure TheT1, T2, T3 parameters are defined as: T1: RNC specific frame number (RFN) that indicates the time when RNC sends the frame through the SAP to the transport layer. T2: NodeB specific frame number (BFN) that indicates the time when NodeB receives the correspondent DL Node synchronization frame through the SAP from the transport layer. T3: NodeB specific frame number (BFN) that indicates the time when NodeB sends the frame through the SAP to the transport layer. V. DL Transport Channels Synchronization DL transport channel synchronization procedure is used to synchronize the transport channel after the transport channel has been set up or used to maintain the synchronization of the transport channel when there is no DL data frame. In the DL transport channel synchronization procedure, CRNC sends a DL Synchronization control Frame to NodeB. This message indicates the target CFN. Upon reception of control message, NodeB shall immediately respond with UL Synchronization Control Frame indicating the Time of Arrival (ToA) for the DL Synchronization frame and the CFN indicated in the received message, as shown in Figure 1-10. 1-12
  29. 29. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions NodeB CRNC DL Synchronization UL Synchronization Figure 1-10 FACH and PCH transport channels synchronization procedure VI. DL Timing Adjustment Timing Adjustment procedure is used for NodeB to indicate the CRNC the incorrect arrival time of downlink data to the NodeB. Timing adjustment procedure is initiated by the NodeB if a DL frame arrives outside of the defined arrival window. If the DL frame has arrived before the ToAWS or after the ToAWE, NodeB will include the ToA and the target CFN in the Timing Adjustment Control Frame, as shown in Figure 1-11. NodeB CRNC Timing Adjustment . Figure 1-11 FACH and PCH Timing Adjustment procedure The arrival window and the time of arrival are defined as follows: Time of Arrival Window Endpoint (ToAWE): ToAWE represents the time point by which the DL data shall arrive to the NodeB from Iub. The ToAWE is defined as the amount of milliseconds before the last time point from which a timely DL transmission for the identified CFN would still be possible taking into account the NodeB internal delays. ToAWE is set via control plane. If data does not arrive before ToAWE a Timing Adjustment Control Frame shall be sent by NodeB. Time of Arrival Window Startpoint (ToAWS): ToAWS represents the time after which the DL data shall arrive to the NodeB from Iub. The ToAWS is defined as the amount of milliseconds from the ToAWE. ToAWS is set via control plane. If data arrives before ToAWS a Timing Adjustment Control Frame shall be sent by NodeB. Time of Arrival (ToA): ToA is the time difference between the end point of the DL arrival window (ToAWE) and the actual arrival time of DL frame for a specific CFN. A positive ToA means that the frame is received before the ToAWE, a negative ToA means that the frame is received after the ToAWE. 1-13
  30. 30. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions1.3.5 Iub FP for Dedicated Transport Channel Data Transfer Iub FP for dedicated transport channel data transfer is the radio network user plane of Iub interface which provides the following services: Transport of TBS between SRNC and NodeB Transport of outer loop power control information between the SRNC and the NodeB Support of transport channel synchronization mechanism Support of Node Synchronization mechanism Transfer of radio interface parameters from the SRNC to the NodeB I. Uplink Data Transfer NodeB SRNC UL Data Frame Figure 1-12 Uplink data transfer procedure Uplink Data Transfer procedure is used to transfer data from NodeB to SRNC. The procedure is realized by a transmission of UL Data Frame from NodeB to SRNC, as shown in Figure 1-12. Two modes can be used for the UL transmission: normal mode and silent mode. The mode is selected by the SRNC when the transport bearer is set up and signalled to the NodeB with the relevant control plane procedure. In normal mode, the NodeB shall always send an UL Data Frame to the RNC for all the DCHs in a set of coordinated DCHs regardless of the number of Transport Blocks of the DCHs. In silent mode and in case only one transport channel is transported on a transport bearer, the NodeB shall not send an UL Data Frame to the RNC when it has received a TFI indicating “number of TB equal to 0” for the transport channel during a TTI. In silent mode and in case of coordinated DCHs, when the NodeB receives a TFI indicating “number of TB equal to 0” for all the DCHs in a set of coordinated DCHs, the NodeB shall not send an UL data frame to the RNC for this set of coordinated DCHs. 1-14
  31. 31. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions II. Downlink Data Transfer NodeB SRNC DL Data Frame Figure 1-13 Downlink data transfer procedure Downlink Data Transfer procedure is used to transfer data from SRNC to NodeB. The procedure is realized by a transmission of DL Data Frame from SRNC to NodeB, as shown in Figure 1-13. The NodeB shall consider a transport bearer synchronized only after it has received at least one data frame on this transport bearer before the latest time of arrival (LTOA). The NodeB shall consider the DL user plane for a certain RL synchronized if all transport bearers established for carrying DL DCH data frames for this RL are synchronized. Only when the DL user plane is considered synchronized, the NodeB shall transmit the data on the DL DPDCH. When the DL user plane is considered synchronized and the NodeB does not receive a valid DL Data Frame in a TTI, it assumes that there is no data to be transmitted in that TTI for this transport channel, and shall act as one of the following cases: If the NodeB is aware of a TFI value corresponding to zero bits for this transport channel, this TFI is assumed. When combining the TFI’s of the different transport channels, a valid TFCI might result and in this case data shall be transmitted on Uu. If the NodeB is not aware of a TFI value corresponding to zero bits for this transport channel or if combining the TFI corresponding to zero bits with other TFI’s, results in an unknown TFI combination, the handling will be different. In the former case, at each radio frame, the NodeB shall build the TFCI value of each CCTrCH, according to the TFI of the DCH data frames multiplexed on this CCTrCH. In the latter case, NodeB shall transmit only the DPCCH without TFCI bits. III. Outer Loop Power Control Information Transfer Outer loop power control information transfer procedure is used to transfer power control information from SRNC to NodeB. 1-15
  32. 32. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions The procedure is realized by a transmission of Outer Loop PC control frame from SRNC to NodeB, as shown in Figure 1-14. The Outer Loop PC control frame can be sent via any of the transport bearers dedicated to one UE. Based, for example, on the CRC Indicator (CRCI) values and on the quality estimate in the UL frames, SRNC modifies the SIR target used by the UL Inner Loop Power Control by including the absolute value of the new SIR target in the Outer Loop PC control frame sent to the NodeBs. At the reception of the Outer Loop PC control frame, the NodeB shall immediately update the SIR target used for the inner loop power control with the specified value. NodeB SRNC Outer Loop PC Figure 1-14 Outer loop power control information transfer procedure IV. Radio Interface Parameter Update Radio interface parameter update procedure is used to update radio interface parameters which are applicable to all RL’s for the concerning UE. Both synchronized and unsynchronized parameter updates are supported. The procedure is realized by a transmission of Radio Interface Parameter Update control frame SRNC to the NodeB, as shown in Figure 1-15 NodeB SRNC Radio Interface Parameter Update Figure 1-15 Radio interface parameter update procedure V. Node Synchronization Node synchronization procedure is to obtain the round trip delay (RTD) of the transmission between information entities over the Iub interface. 1-16
  33. 33. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions In the Node Synchronization procedure, the SRNC sends a DL Node Synchronization control frame to NodeB containing the parameter T1. Upon reception of a DL Node Synchronization control frame, the NodeB shall respond with UL Node Synchronization control frame, indicating t2 and t3, as well as t1 which was indicated in the initiating DL Node Synchronization control frame, as shown in Figure 1-16. NodeB SRNC DL Node Synchronization UL Node Synchronization Figure 1-16 Node synchronization procedure The T1, T2, T3 parameters are defined as: T1: RNC specific frame number (RFN) that indicates the time when RNC sends the frame through the SAP to the transport layer. T2: NodeB specific frame number (BFN) that indicates the time when NodeB receives the correspondent DL synchronization frame through the SAP from the transport layer. T3: NodeB specific frame number (BFN) that indicates the time when NodeB sends the frame through the SAP to the transport layer. VI. Downlink Transport Channel Sychronization Downlink transport channel synchronization procedure is used to achieve or restore the synchronization of the DCH data stream in DL direction, and as a keep-alive procedure in order to maintain activity on the Iur/Iub transport bearer. In the downlink transport channel synchronization procedure, CRNC sends a DL Synchronization control frame to NodeB. This message indicates the target CFN. Upon reception of control message, NodeB shall immediately respond with UL Synchronization control frame indicating the Time of Arrival (ToA) for the DL Synchronization frame and the CFN indicated in the received message, as shown in Figure 1-17. UL Synchronization control frame shall always be sent, even if the DL Synchronization control frame is received by the NodeB within the arrival window. 1-17
  34. 34. Protocols and Signalling Analysis Chapter 1HUAWEI UMTS Radio Access Network UTRAN Interface Protocols and Functions NodeB SRNC DL Synchronization UL Synchronization Figure 1-17 DCH synchronization procedure VII. Downlink Timing Adjustment The timing adjustment procedure is used to keep the synchronization of the DCH data stream in DL direction. Timing adjustment procedure is initiated by the NodeB if a DL frame arrives outside of the defined arrival window. If the DL frame has arrived before the ToAWS or after the ToAWE, NodeB will include the ToA and the target CFN in the Timing Adjustment control frame, as shown in Figure 1-18. NodeB SRNC Timing Adjustment Figure 1-18 Timing adjustment procedure1.4 Iur Interface1.4.1 Iur Protocol Structure Iur interface is the interface between RNCs, The protocol stack of Iur interface is illustrated in Figure 1-19. 1-18

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