Sys205!1!0(Hsdpa Protocols)

8/6/2019 Sys205!1!0(Hsdpa Protocols)

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HSDPA System Architecture and Protocols

HSDPA System Architecture and ProtocolsFOR TRAINING PURPOSES ONLY - THIS MANUAL WILL NOT BE UPDATED

MOTOROLA LTD.2002


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Copyrights

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estoppel or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the rights that arise by operationof law in the sale of a product.

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The software described in this document is the property of Motorola. It is furnished under a license agreement and may be used and/ordisclosed only in accordance with the terms of the agreement. Software and documentation are copyright materials. Making unauthorizedcopies is prohibited by law. No part of the software or documentation may be reproduced, transmitted, transcribed, stored in a retrievalsystem, or translated into any language or computer language, in any form or by any means, without prior written permission of Motorola.

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MOTOROLA LTD.2002 HSDPA System Architecture and ProtocolsFOR TRAINING PURPOSES ONLY - THIS MANUAL WILL NOT BE


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Contents1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

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HSDPA System Architecture and Protocols

Chapter 1: HSDPA Overview

Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3HSDPA (High Speed Downlink Packet Access) for WCDMA . . . . . . . . . . . . . . . . . . . 1-4

Feature Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Compatibility with Release 99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Demand for Packet Switched Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

HSDPA Targets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Higher Data Rates for Streaming-, Interactive- and Background Services . . . . . . . . . . . 1-6Consideration of UE Processing Time and Memory Requirements . . . . . . . . . . . . . . 1-6Higher Spectrum Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Small Changes to existing Techniques and Architectures . . . . . . . . . . . . . . . . . . . 1-6Efficient Resource Sharing in Downlink among Users . . . . . . . . . . . . . . . . . . . . 1-6

HSDPA Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Modulation Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Higher Throughput Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

AMC (Adaptive Modulation and Coding) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Hybrid ARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Transmission and Retransmission Scheduling in NodeB . . . . . . . . . . . . . . . . . . . 1-8

QPSK versus 16-QAM Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10QPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1016QAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Maximum Throughput Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12UMTS Rel. 99 / Rel. 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12HSDPA Rel. 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Important Changes for HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14New 2 ms Subframe for HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14New Physical Channels and Transport Channel with HSDPA . . . . . . . . . . . . . . . . . 1-14No Fast Power Control and variable Spreading Factor . . . . . . . . . . . . . . . . . . . . 1-14New UE Capabilities / Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14New MAC-hs in NodeB and UE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14Impact on NBAP and Frame Protocol Procedure . . . . . . . . . . . . . . . . . . . . . . . 1-14

New Channels with HSDPA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Transport Channel: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

HS-DSCH (High Speed Downlink Shared Channel) . . . . . . . . . . . . . . . . . . . . 1-16Physical Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

High Speed Shared Control Channel (HS-SCCH) . . . . . . . . . . . . . . . . . . . . . 1-16High Speed Physical Downlink Shared Channel (HS-PDSCH) . . . . . . . . . . . . . . 1-16Uplink Dedicated Control Channel Associated with HS-DSCH Transmission (UplinkH S - D P C C H ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

HSDPA Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18MAC-hs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18New Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18UE Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

HSDPA and DPCH Operation HSDPA Setup . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20HSDPA Setup via DPCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20HSDPA Transmission and Retransmission . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

Physical Channel Combinations supported with HSDPA on the same FDD Frequency . . 1-22HSDPA High Speed Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

H-RNTI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24


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DL-HSPDSCH-Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26HS-SCCH Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

Downlink Scrambling Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26HS-SCCH Channelization Code info . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26HS-SCCH Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

Channel Type Switching with HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28CELL_DCH ONLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28CELL_DCH & HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28CELL_FACH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

HSDPA Control and User Plane Extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30Control Plane Extensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

New NBAP, RRC & RNSAP IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30Radio Resource Sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

Admission / Congestion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30User Plane Extensions:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

PDCP/RLC/MAC-d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30Frame Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

HSDPA Packet Switched Protocol Stacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

HSDPA Control Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32Access Stratum Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32Non Access Stratum Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32MAC-hs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

HSDPA User Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34Configuration without MAC-c/sh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34MAC-d entity UE Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34MAC-hs entity UE Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34MAC-d entity UTRAN Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34MAC-hs UTRAN Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34

HSDPA Timing Relations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36HSDPA Downlink Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36

DPCH (Dedicated Physical Channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36

HS-SCCH (High Speed Shared Control Channel). . . . . . . . . . . . . . . . . . . . . 1-36HS-PDSCH (High Speed Physical Downlink Shared Transport Channel) . . . . . . . . . 1-36

HSDPA Uplink Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-387.5 slots delay of uplink HS-DPCCH . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38

Composition of the HS-SCCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40Modulation Type and Number of HS-PDSCHs . . . . . . . . . . . . . . . . . . . . . . . . 1-40HARQ Info (Hybrid-ARQ-related Information) . . . . . . . . . . . . . . . . . . . . . . . . . 1-40

Hybrid ARQ Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42Type I Hybrid ARQ Low UE Complexity . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42Type II Hybrid ARQ High UE Complexity . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42Type III Hybrid ARQ medium UE Complexity . . . . . . . . . . . . . . . . . . . . . . . . 1-42

DCH / HS-DSCH Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44Variable Spreading Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44

Fast Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44AMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44Multicode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44Fast Layer 1 ARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44

DPCH / HS-PDSCH Comparison contd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4616-QAM Modulation / Interleaving / Channel Coding Scheme . . . . . . . . . . . . . . . . . 1-46TrCH Multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46Static rate matching - DCH versus HS-DSCH. . . . . . . . . . . . . . . . . . . . . . . . . 1-46Transport block concatenation - DCH versus HS-DSCH. . . . . . . . . . . . . . . . . . . . 1-46Soft(er) Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46

Advantages and Disadvantages of HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-48Advantages of HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-48

Reduced Latency for retransmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-48

Higher DL Throughput and Peak Throughput Rates up to 14 Mbit/s . . . . . . . . . . . . 1-48Support of Non-Real Time and Streaming Applications . . . . . . . . . . . . . . . . . . 1-48High Spectrum and Code Efficiency due to 16-QAM . . . . . . . . . . . . . . . . . . . 1-48

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Disadvantages of HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50Higher Processing power in UE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50More Memory in UE due to HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50

Advanced Receiver for 16-QAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50Higher Vulnerability using 16-QAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50

Software and possibly Hardware Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50No Macro-Diversity for HS-PDSCH, HS-SCCH . . . . . . . . . . . . . . . . . . . . . . . . 1-52Power / Interference Increase in uplink and downlink . . . . . . . . . . . . . . . . . . . . . 1-52Signalling Overhead caused by HS-SCCH (dl) and DPCCH (ul) . . . . . . . . . . . . . . . . 1-52

Future Enhancements of HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54Beamforming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54Transmit Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54MIMO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54

Preview to HSUPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-56Total available Transmission Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-56Much larger Dynamic of the UL Power Control . . . . . . . . . . . . . . . . . . . . . . . . 1-56UL does not suffer from Channelization Code Shortage . . . . . . . . . . . . . . . . . . . . 1-56Fast Power Control cannot be abandoned in UL . . . . . . . . . . . . . . . . . . . . . . . 1-56

HSUPA - Areas of Improvement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-58NodeB controlled scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-58Hybrid ARQ in Uplink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-58Shorter TTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-58

HSUPA - Less Beneficial Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60Higher Order Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60Fast DCH Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60

Chapter 2: HSDPA Principles

Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3HS-SCCH Frame Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Part 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Part 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4HS-SCCH Coding Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

RV Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6MUX of HS-SCCH Part 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6MUX of HS-SCCH Part 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6HS-SCCH Channel Coding and Rate Matching . . . . . . . . . . . . . . . . . . . . . . . . 2-6UE specific Masking of Part 1 bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

UE specific Masking for Part 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8UE Specific CRC Attachment for Part 1 and Part 2 . . . . . . . . . . . . . . . . . . . . . . . . 2-10HARQ Process ID and New Data Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

HARQ Process ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12New Data Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

1-Channel Stop and Wait . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

HARQ Processes with N-Channel Stop and Wait . . . . . . . . . . . . . . . . . . . . . . . . . 2-16Preconditions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16HS-SCCH Signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16HS-DSCH Transmission and Retransmission . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Multicode Operation in HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18HS-SCCH-set Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18HS-DSCH Demodulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

HS-SCCH Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20HS-PDSCH Frame Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22HS-PDSCH Channelization Code Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24HSDPA Code- and Time Multiplex Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

Resource sharing in code as well as well time domain . . . . . . . . . . . . . . . . . . . . 2-26

UE procedure for receiving HS-DSCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26Uplink HS-DPCCH Frame Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

HARQ-Ack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28


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Channel Quality Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28Uplink HS-DPCCH Code Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

Multicode Operation in Uplink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30Uplink HS-DPCCH Coding Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Channel Coding for HS-DPCCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Channel Coding for HARQ-Ack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32Channel Coding for CQI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Uplink HS-DPCCH Spreading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34Spreading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34DPCCH / DPDCH / HS-DPCCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34Gain Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

Uplink Transmission Delay T(0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36Uplink / Downlink Timing at UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36Uplink Fast Power Control Reason for T(0) . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

HS-SCCH / HS-DSCH and HS-DPCCH Timing (1) . . . . . . . . . . . . . . . . . . . . . . . . 2-38HS-SCCH / HS-DSCH and HS-DPCCH Timing (2) . . . . . . . . . . . . . . . . . . . . . . . . 2-40

Uplink HS-DPCCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40T(TX_diff) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40

Delta Ack / Nack and Ack-Nack Repetition Factor . . . . . . . . . . . . . . . . . . . . . . . . . 2-42DeltaAck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42DeltaNack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42

ACK-NACK-repetitionFactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42Delta Ack / Nack and CQI Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44HS-DPCCH ACK / NACK and DTX Recognition. . . . . . . . . . . . . . . . . . . . . . . . . . 2-46

False Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46CQI Description and Task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

TFRC Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48Out of Range Signaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48Power Reduction Factor 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48Measurement Power Offset 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48CQI Reporting Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

HS-DPCCH Measurement Feed Back - CQI . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50Measurement Power Offset 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50CQI Feedback cycle, k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50CQI-RepetitionFactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50DeltaCQI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50

CQI Reporting Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52UE measures the downlink channel quality . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52CQI Algorithm in UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54NodeB TFRC decision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56

CQI Mapping Table UE Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58UE Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58CQI value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58Transport Block Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58

Reference Power Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58N(IR) and X(RV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58

Example for a CQI Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60CQI and Ack/Nack Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62

HS-DPCCH Power Control during Soft Handover . . . . . . . . . . . . . . . . . . . . . . . 2-62CQI Repetition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62Intra NodeB Softer HO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62

CQI Reporting Feedback Cycle and Repetition . . . . . . . . . . . . . . . . . . . . . . . . . 2-64Ack/Nack Repetition Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64Trade off between Ack/Nack/CQI Repetition and long Feedback Cycles . . . . . . . . . . . . 2-64

HSDPA during Compressed Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66Effects of Using 16-QAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68

Higher Throughput Rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68

Increased Spectrum Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68Higher Interference Vulnerability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68Smaller Decision Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68

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16-QAM Constellation Rearrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7016-QAM Constellation Rearrangement for b = 2 and b = 3 . . . . . . . . . . . . . . . . . . . . 2-72

Bit Re-arrangement b = 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72Bit Re-arrangement b = 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72

Power Sharing between HSDPA and DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74

Node B Transmit Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74Maximum Transmission Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74UE Transmit Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74

Adaptive Modulation and Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76Main Benefits of AMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76

Availability of higher throughput and therefore increased average throughput per cell. . . . 2-76Reduced interference variation due to modulation and coding based link adaptation insteadof variations in transmit power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76Utilization of short term fading in the way that a user might be always served in a constructivefade. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76Boosted effectiveness in combination with time and code multiplexing schedulingt e c h n i q u e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76

Adaptive Modulation and Coding - Principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

AMC Scheduling Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78Layer 1 Processing Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

Physical Layer Processing Chain of AMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80Methods of selecting the suitable MCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80

AMC Processing Chain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80AMC Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82

UEs measurement inaccuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82Delay in CQI Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82Limited Granularity for Data Rate Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82NodeB Processing and Scheduling Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82

HSDPA HARQ Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84Chase Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84Partial IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84

Full IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84HARQ Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86

Chase Combining Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86Operation of Partial IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88Operation of Full IR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-90

Scheduling Strategies Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92AMC Scheduling Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92

The predicted or estimated channel quality . . . . . . . . . . . . . . . . . . . . . . . . 2-92The current load of the cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92The traffic priority class (e.g. streaming class or background class) . . . . . . . . . . . . 2-92QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92

Comparison of Basic Packet Scheduler Methods . . . . . . . . . . . . . . . . . . . . . . . . . 2-94Scheduling Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

Serve Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94Allocation Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

FT (Fair Throughput) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94P-FR (Proportional Fair Resources) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94M-C/I (Maximum C/I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

Packet Scheduler in NodeB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96Fairness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96Opportunistic Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96Minimum Throughput Guarantees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96Effect of TCP/IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96Influence of Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

Packet Scheduling Strategies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98Fair Throughput Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98

Fair Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98Long Term C/I Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98Proportional Fair Resource Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98


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Multi-User Selection Diversity Dynamic Scheduling . . . . . . . . . . . . . . . . . . . . . . . 2-100Dynamic Scheduling according to best C/I . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100Scheduler Resources include: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100MAC-hs Scheduler should not allocate any HSDPA Resources to a User which: . . . . . . . 2-100

Chapter 3: Forward and Backward Error CorrectionObjectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Turbo Coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Turbo Coder Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4RSC Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Interleaver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Turbo Coder Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Trellis termination for Turbo coder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Turbo Code internal Interleaver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Iterative Decoding Principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8TFRI - Transport Block Size Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

QPSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

16-QAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12HARQ Retransmission Comparison with Legacy Releases . . . . . . . . . . . . . . . . . . . 3-14DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14HS-DSCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Redundancy Version and Constellation Version . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16HSDPA Category and Reference Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

HS-DSCH Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18Maximum number of HS-DSCH multi codes . . . . . . . . . . . . . . . . . . . . . . . . . 3-18Minimum inter-TTI interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18Maximum Number of HS-DSCH Transport Channel Bits received within HS-DSCH TTI . . . . 3-18Total Number of Soft Channel Bits over all HARQ Processes . . . . . . . . . . . . . . . . . 3-18Maximum Number of RLC-AM Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18Total RLC-AM and MAC-hs Buffer Size [KBytes] . . . . . . . . . . . . . . . . . . . . . . . 3-18

Number of HARQ Processes versus IR Memory . . . . . . . . . . . . . . . . . . . . . . . . . 3-20Chase Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20IR Retransmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

HARQ Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22Memory Partitioning is set to Implicit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22Memory Partitioning is set to Explicit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

HARQ Principle in HSDPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24NodeB Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24UE Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24

HS-DSCH HARQ Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26Turbo Coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26Bit Separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-261st RM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

2nd RM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26RV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26Bit Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

HARQ Parameters for Retransmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28Transmission Parameters = Retransmission Parameters . . . . . . . . . . . . . . . . . . . 3-28Transmission Parameters Retransmission Parameters . . . . . . . . . . . . . . . . . . 3-28

Rate Matching Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30First Rate Matching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30Second Rate Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

N(CH) = N(data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30Bit Rearrangement and Redundancy Version Selection . . . . . . . . . . . . . . . . . . 3-30

First RM Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32Puncturing Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32

Second Rate Matching Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34RM Pattern Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Bit Repetition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

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Example for Initial Transmission Self-decodable with 1st RM . . . . . . . . . . . . . . . . . . 3-38Example for Initial Transmission-Self-decodable with 1st RM . . . . . . . . . . . . . . . . . 3-38

Example for Retransmission Non-self-decodable . . . . . . . . . . . . . . . . . . . . . . . . 3-40Full IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40Partial IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

Example for Chase Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42Overview over transmission capacity considerations . . . . . . . . . . . . . . . . . . . . . 3-42

2nd RM Parameter Calculation Self-Decodable . . . . . . . . . . . . . . . . . . . . . . . . . 3-44Turbo Coding with Transparent 1st RM stage . . . . . . . . . . . . . . . . . . . . . . . . . 3-44X(i), e(plus) and e(minus) Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44Initial Setting of e and Redundancy Version r . . . . . . . . . . . . . . . . . . . . . . . . . 3-44

2nd RM Bit Position Calculation Self-Decodable . . . . . . . . . . . . . . . . . . . . . . . . 3-46Systematic RM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46Parity_1 RM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46Parity_2 RM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46

2nd RM Self-Decodable Transmission followed by Full IR (1) . . . . . . . . . . . . . . . . . . 3-482nd RM Self-Decodable Transmission followed by Full IR (2) . . . . . . . . . . . . . . . . . . 3-502nd RM Parameter Calculation Non-Self-Decodable . . . . . . . . . . . . . . . . . . . . . . 3-52

2nd RM Bit Position Calculation Non-Self-Decodable . . . . . . . . . . . . . . . . . . . . . . 3-54Rate Matching Exercise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56Comparison between Full and Partial IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58

R = 3/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58R = 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58

HARQ Performance Enhancement Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . 3-60HS-PDSCH Interleaving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62

DTX Indication Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62

Chapter 4: HSDPA Protocol Enhancements and Extensions

Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3HSDPA Architecture Evolution from Rel 99 / Rel 4 . . . . . . . . . . . . . . . . . . . . . . . 4-4

Protocol Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4HS-DSCH Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

NBAP - HSDPA Message and IE Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCH Resources Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCHs MAC-d Flow To Rearrange . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCH FDD Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCH MAC-d Flows To Add . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCH Information To Modify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6HS-DSCH MAC-d Flows To Delete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

NBAP - HSDPA Common Measurement Report. . . . . . . . . . . . . . . . . . . . . . . . . . 4-8HS-DSCH Required Power Value Information . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Scheduling Priority Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8HS-DSCH Required Power Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

HS-DSCH Required Power Per UE Information . . . . . . . . . . . . . . . . . . . . . . . . 4-8HS-DSCH Required Power Per UE Weight . . . . . . . . . . . . . . . . . . . . . . . . 4-8HS-DSCH Provided Bit Rate Value Information . . . . . . . . . . . . . . . . . . . . . . 4-8HS-DSCH Provided Bit Rate Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

NBAP HSDPA Radio Link Parameter Update Indication . . . . . . . . . . . . . . . . . . . . . 4-10NBAP - HS-DSCH Related IEs (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Allocation / Retention Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12ARP Value Meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Priority Flow Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Scheduling Priority Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Discard Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12MAC-hs Guaranteed Bit Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

NBAP - HS-DSCH Related IEs (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

MAC-d PDU Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14RLC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

UE Capabilities Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14


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HS-SCCH Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14NBAP HS-DSCH Info Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

HS-DSCH Initial Capacity Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16HS-SCCH Specific Information Response . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16HARQ Memory Partitioning Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

HS-PDSCH and HS-SCCH Power and Code Information . . . . . . . . . . . . . . . . . . . . . 4-18HSDPA Cell Configuration - AUDIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20HSDPA Data Transfer Procedure (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22HSDPA Data Transfer Procedure (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24RRC Protocol Enhancement New IEs with HSDPA . . . . . . . . . . . . . . . . . . . . . . . 4-26

MP Mandatory Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26MD Mandatory Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26CV Conditional Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26OP - Optional. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Added or Reconfigured MAC-d Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28MAC-d Flow Identity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28MAC-hs Queue Id . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28T1 Reorder Release Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

MAC-d PDU Size Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28Uplink DPCH Power Control Info and Others . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30

Uplink DPCH Power Control Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30MAC-hs Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30Serving HS-DSCH Radio Link Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30

MAC-hs Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32MAC-hs - co-incident CRNC and SRNC . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32HS-DSCH RNTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

MAC-hs Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34Iub Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34Packet Buffering and Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34TFRC Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

AMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34HS-DSCH MAC PDU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36MAC-hs SDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36MAC-hs Header of MAC-hs PDU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

MAC-hs Entity UTRAN Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38Scheduling/Priority Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38TFRC Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38MAC-d / Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

MAC-hs Entity UE Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40Reordering Queue distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

Reordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40MAC-d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

HS-DSCH MAC Architecture UTRAN Side . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42Overall Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42MAC-c/sh (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42MAC-d Flow in UTRAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

MAC-d flow: 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42MAC-d flow: 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42MAC-d flow: 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

HS-DSCH Architecture UE Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44Overall Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44MAC-d Flow in UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

Reordering / Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44MAC-d flow: 0, 1, 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

HS-DSCH Scheduler Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

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UE Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46Serving Priority Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46Updating MAC-hs Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46Scheduling new Transmission and retransmission . . . . . . . . . . . . . . . . . . . . . . 4-46Determining RV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

NodeB HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48HARQ Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48HARQ Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48Error Handling in HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

HS-DSCH Bit Rate Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50UE MAC-hs Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52

UE HARQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52HARQ Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52HARQ Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52

Transmitter and Receiver Stall Avoidance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54Timer-Based Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54Window Bases Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54HARQ Activity Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54

UE Reordering Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56State Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56Timer T1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56Receiver Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

Timer and / or Window Based Stall Avoidance . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58Window Based Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58Timer Bases Scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58

UE MAC-hs Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60Disassemble Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60MAC-hs Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60

HS-PDSCH and DL TrCH Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62Activation Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62

Downlink Transport Channel Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62HS-DSCH Data Frame on Iub/Iur (HS-DSCH FP) . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

CmCH-PI (Common Transport Channel Priority Indicator). . . . . . . . . . . . . . . . . . . 4-64MAC-d PDU Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64NumOfPDU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64User Buffer Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64MAC-d PDU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

Control Frame Format for HS-DSCH FP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-66HS-DSCH Capacity Request Control Frame . . . . . . . . . . . . . . . . . . . . . . . . . 4-66

HS-DSCH Capacity Allocation Control Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68Maximum MAC-d PDU Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68HS-DSCH Credits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68HS-DSCH Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68

HS-DSCH Repetition Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68

Chapter 5: HSDPA Mobility

Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3Introduction to HSDPA Mobility Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Serving HS-DSCH Cell Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4Best Serving HS-DSCH Cell Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Change of best Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6HS-DSCH Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Intra NodeB Synchronized HS-DSCH Cell Change . . . . . . . . . . . . . . . . . . . . . . . . 5-8MAC-hs Preservation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Intra NodeB Synchronized HS-DSCH Cell Change Procedure . . . . . . . . . . . . . . . . . . 5-10

Inter NodeB Synchronized Serving HS-DSCH Cell Change . . . . . . . . . . . . . . . . . . . . 5-12Inter NodeB HS-DSCH Cell Change Hard Handover(1) . . . . . . . . . . . . . . . . . . . . . 5-14Inter NodeB HS-DSCH Cell Change Hard Handover (2). . . . . . . . . . . . . . . . . . . . . 5-16


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About This Manual Version 1 Rev 0

HSDPA System Architecture and Protocols1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

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HSDPA Overview Version 1 Rev 0

Chapter 1

HSDPA Overview


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Objectives Version 1 Rev 0

ObjectivesOn completion of this chapter the Student will be able to:

Describe the important changes and characteristics of HSDPA

State the new channels of HSDPA and how they operate in principle

Describe the extended UTRAN protocol stack with HSDPA

State the advantages and disadvantages of HSDPA and future enhancements

Describe the concept of HSUPA


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Version 1 Rev 0 HSDPA (High Speed Downlink Packet Access) for WCDMA

HSDPA (High Speed Downlink Packet Access) for WCDMAHSDPA considers the trend that the volume of IP-based traffic has already exceeded that forcircuit-switched traffic in most fixed networks. The same change can be anticipated in mobile networksbecause of new IP-based mobile services becoming available and are used by increasing number of

people in their daily communication. Current estimates show that in advanced mobile communicationmarkets, packet-switched traffic will overtake circuit-switched traffic in the near future. Deliveryof digital content over mobile networks will generate additional traffic and revenue.

Feature Study

The HSDPA feature in 3GPP Release 5 is the result of a study carried out in the Release 4time frame. This study considered a number of techniques in order to provide instantaneoushigh speed data in the downlink. Some of the considerations and goals taken intoaccount in the evaluation of the different techniques were:

To focus on the streaming, interactive and background services: services which requirea constant and/high throughput or low error rate.

To prioritise urban environments and then indoor deploymens (but not limited tothese environments and supporting full mobility).

To enable compatibility with advanced antenna and receiver techniques: transmit andreceive diversity methods are used and might be enhanced

To take into account User Equipment processing time and memory requirements:UEs limitations are taken into account by the network

To minimize changes on existing techniques and architectures: modest changesto NodeB hardware and UTRAN software

Compatibility with Release 99

HSDPA is designed to co-exist on the same carrier as the current Release 99 WCDMA services,enabling a smooth and cost-efficient introduction of HSDPA into existing WCDMA networks.

Demand for Packet Switched Traffic

The increasing demand for capacity in order to provide high data rate multimedia services inwireless environments necessitates enhanced radio transmission techniques and network protocolfunctionality. Such techniques have to be added to already existing mobile cellular networks. For3rd generation UMTS networks based on WCDMA, the HSDPA is being introduced to meet thisdemand and improve spectral efficiency by higher order modulation using 16-QAM.

Note: HSDPA achieves gross data rates in downlink up to 14 Mbit/s under ideal conditions.The reverse link (uplink) may remain on 64 kbit/s until at a later stage new features areintroduced with HSUPA (High Speed Uplink Packet Access). However, HSUPA will requirenew mobile terminals and PC-cards to operate with. Except where otherwise indicated, the

description of this course only applies to the FDD mode of UMTS.


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Version 1 Rev 0 HSDPA Targets

HSDPA Targets

Higher Data Rates for Streaming-, Interactive- and Background Services

HSDPA is a feature based on a downlink shared channel that allows user net-data rates of up to

10 Mbit/s. It is designed to support services that require instantaneous high rates in the downlinkand lower rates on the uplink. This feature also decreases the level of retransmissions (at theradio link and hence higher layers), in turn allowing the reduction of delivery time. Examples ofend-user services targeted by HSDPA are internet browsing and video on demand.

Consideration of UE Processing Time and Memory Requirements

HSDPA takes UE limitations like available physical memory for transmission and especially forretransmission into account. Also the physical channel processing capability is considered.(Examples: Minimum inter-TTI interval, transport channel bits per TTI)

Higher Spectrum Efficiency

With 16-QAM applied in downlink, throughput rates can be doubled compared to QPSK which isused for Rel. 99 and Rel. 4 physical channels. The amount of bits/Hz is increased with 16-QAMas one modulation symbol corresponds to 4 chips whereas in QPSK one modulation symbolrepresents 2 chips. Even when HSDPA is uses QPSK modulation the spectrum efficiency increasesas HSDPA exploits good C/I conditions. This is achieved by reducing the protection (increasingthe code rate) and thus having more capacity for the application data.

Small Changes to existing Techniques and Architectures

HSDPA minimizes the necessary upgrades and changes in UTRAN and UE. Nevertheless someprotocol additions are necessary in NodeB and UE as well some enhancements of existing proceduresand protocols. They are mentioned in the following pages and are explained in full detail in chapter 4.

Efficient Resource Sharing in Downlink among Users

HSDPA introduces a new transport channel type that makes efficient use of valuable radio frequencyresources. Beside this, it takes into account the bursty nature of packet switched data by sharingthe channelization codes, transmission power and infrastructure hardware among users.


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HSDPA Targets Version 1 Rev 0

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Version 1 Rev 0 QPSK versus 16-QAM Modulation

QPSK versus 16-QAM ModulationThe figure illustrates the I/Q Plane for QPSK and 16-QAM modulation technique.

QPSK

Each symbol corresponds to 2 consecutive input bits. The four symbols are representedby different phase shifts in the I/Q plane.

16QAM

Each symbol corresponds to four consecutive input bits. Thus the data rate can be doubled with16-QAM compared to QPSK. The 16 symbols are represented in the I/Q plane by different phaseshifts and amplitudes. In 16-QAM modulation the symbol value is determined by phase andamplitude. Compared to that, in QPSK the phase is only modulated and variation in amplitudehave only minor influence on the decision space in the I/Q diagram. However with 16-QAM thedecision space is heavily influenced by amplitude variations, thus higher constraints are put onthe transmitter linearity. Note, a more accurate phase estimate is necessary with 16-QAM since

constellation points have smaller differences in phase domain compared to QPSK.Note: The number of constellation points in the I/Q-diagram can be calculated with 2m,where m represents the number of bits or chips per modulation symbol. QPSK modulationhas four constellation points in the I/Q-diagram: 2^m = 4 m = 2. 16-QAM modulationhas 16 constellation points in the I/Q-diagram: 2^m = 16 m = 4


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Version 1 Rev 0 Maximum Throughput Rates

Maximum Throughput RatesThe formulas opposite consider the physical maximum throughput rates available in FDD modeof WCDMA according to releases and modulation. In Rel. 99 and Rel. 4 only QPSK is usedwhereas Rel. 5 allows also to user higher order modulation scheme 16-QAM. The standard chip

rate is 3.84 Mchips/s across all releases. The slot duration is in all releases 0.67ms correspondingto 2560 chips. Note that the physical maximum chip rate achievable with 3.84 Mchips/s andQPSK modulation is: 2 chips/symbol x 3.84 Mchips/s = 7.68 Mchips/s

UMTS Rel. 99 / Rel. 4

Downlink:

In the downlink, the DPDCH and DPCCH are time multiplexed onto I and Q plane so theDPDCH data rate also depends on the DPCCH data rate. The physical maximum bit rate(ignoring losses due to DPCCH) using spreading factor 4 is 5.76 Mbit/s.

The downlink slot format # 16 allows for 1248 DPDCH bits/slot and per physical channel.

The maximum DPDCH data rate considering 3 spreading codes @ sf4 is: 1248

bits/slot x 15 slots x (3 OVSFs) = 5.616 Mbit/s

Uplink:

In the uplink each channel DPDCH and DPCCH is assigned an orthogonal channelizationcode. As both physical channels are I/Q multiplexed, (i.e. separated onto I and Q phases),the maximum physical data rate has to be calculated with 1 bit/symbol.

The uplink slot format # 6 allows for 640 bits/slot.

The maximum DPDCH data rate considering 6 spreading codes @ sf4 is therefore: 5.76 Mbit/s.

HSDPA Rel. 5

In HSDPA the spreading factor for the user plane is fixed to 16. Thus up to 15 physicalchannels can be allocated at maximum per UE.

QPSK:

The downlink slot format # 0 allows for 320 bits/slot and per physical channel.This results in 960 bits/ 2 ms subframe.

The maximum physical data rate considering 15 spreading codes @ sf16 is: 7.2 Mbit/s.

16-QAM

The downlink slot format #1 allows for 640 bits/slot and per physical channel.This results in 1920 bits/ 2 ms subframe.

The maximum physical data rate considering 15 spreading codes @ sf16 is: 14.4 Mbit/s.


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Maximum Throughput Rates Version 1 Rev 0

Maximum Throughput Rates

UMTS Rel. 99 / Rel 4

Downlink

2 bits/symbol x [3.84 Mcps / (4 chips/symbol)] x (3 OVSF's) = 5.76 Mbits/S

Uplink

1 bits/symbol x [3.84 Mcps / (4 chips/symbol)] x (6 OVSF's) = 5.76 Mbits/S

HSDPA Rel. 5

QPSK2 bits/symbol x [3.84 Mcps / (16 chips/symbol)] x (15 OVSF's) = 7.2 Mbits/S

16-QAM

4 bits/symbol x [3.84 Mcps / (16 chips/symbol)] x (15 OVSF's) = 14.4 Mbits/


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Version 1 Rev 0 Important Changes for HSDPA

Important Changes for HSDPAHSDPA involves significant changes in the UTRAN providing a high flexibility to react tochanging air-interface conditions or variable user QoS.

New 2 ms Subframe for HSDPAThe TTI (Transmission Time Interval) in HSDPA has been reduced to 2 ms in order to be fasterin retransmitting erroneous data blocks compared to the minimum TTI of 10 ms in UTRA-FDD.

Another advantage of the shorter TTI in HSDPA is that NodeB can adapt literally every datablock to fast changing radio conditions by the means of AMC. Thus it is possible to counteractfading on the air-interface by adjusting modulation and coding every 2 ms.

New Physical Channels and Transport Channel with HSDPA

New channels are introduced for HSDPA: HS-PDSCH, HS-SCCH, HS-DPCCH and HS-DSCH.

No Fast Power Control and variable Spreading Factor

With HSDPA, two of the most fundamental features of WCDMA, fast power control and variablespreading factor are disabled and replaced by AMC (Adaptive Modulation and Coding). Note:

AMC uses multicode operation (the UE can use more than one channelization code in parallel)in order to increase the data rate for a certain user and adapts the code rate to the air-interfacequality. By these means AMC is able to improve the user throughput or at least keep it constanteven the downlink channel quality deteriorates between subsequent transmissions.

New UE Capabilities / Categories

The HSDPA feature is optional for both UE and network in Rel. 5. The UE indicates itsHSDPA support and its HS-DSCH physical layer category within the radio access capabilityparameter.. The physical layer category defines among other parameters the maximum

number of channelization codes the UE supports in parallel for multicode operation. A UEmay support up to 5, 10 or 15 channelization codes in parallel.

New MAC-hs in NodeB and UE

The implementation of Medium Access Control (MAC-hs) in NodeB and UE is a pre-requisitefor allowing the NodeB to schedule transmissions and retransmission, to maintain the HSDPAspecific channels and to operate with AMC and Hybrid ARQ.

Impact on NBAP and Frame Protocol Procedure

NBAP procedures need to support HSDPA capability and HSDPA related parameters. The increasedbandwidth needs to be supported by the frame protocol. Among other parameters the frame protocolneeds to cater for HSDPA flow control information, priority queue handling and UE capability information.


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Version 1 Rev 0 New Channels with HSDPA

New Channels with HSDPAThe support of HSDPA

Sys205!1!0(Hsdpa Protocols)

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