HSDPA - Design Details & System Engineering

[2-day course, Euro 2,350.- (net) per participant]

HSDPA Principles

Course Description

HSDPA (High Speed Downlink Packet Access) for WCDMA
- Feature Study
- Compatibility with Release ‘99
- Demand for Packet Switched Traffic
- HSDPA Targets with Regards to Rel.’99
  - Higher Data Rates for Streaming-, Interactive- and Background Services
  - Consideration of UE Processing Time and Memory Requirements
  - Higher Spectrum Efficiency
  - Small Changes to existing Techniques and Architectures
  - Efficient Resource Sharing in Downlink among Users
  - UE Category’s – HSDPA Physical Capability
  - IR Memory and Stop & Wait Machines
  - IR Memory and Stop & Wait Machines
HSDPA Characteristics
- Modulation Types
- Higher Cell and Subscriber Throughput Rates in Downlink
- AMC (Adaptive Modulation and Coding)
- Hybrid ARQ with N-SAW
- Transmission and Retransmission Scheduling in NodeB
- QPSK versus 16-QAM Modulation
  - QPSK
  - 16-QAM
  - 16-QAM Sensitivity and SNR
  - Maximum Throughput Rates
- Hybrid ARQ Techniques - Link Adaptation
  - Type I Hybrid ARQ – Low UE Complexity
  - Type II Hybrid ARQ – High UE Complexity
  - Type III Hybrid ARQ – Medium UE Complexity
  - Turbo Coding – Systematic Bits, self-decodable and non-self-decodable Transmission
Important Changes with HSDPA
- New 2 ms Subframe for HSDPA
- New Physical Channels and Transport Channel with HSDPA
- No Fast Power Control and variable Spreading Factor
- New UE Capabilities / Categories
- New MAC-hs in NodeB and UE
- Impact on RRC, NBAP (RNSAP) and Frame Protocol
New Channels with HSDPA
- Physical Channels
  - HS-PDSCH (High Speed Physical Downlink Shared Channel)
  - HS-SCCH (High Speed Shared Control Channel)
  - HS-DPCCH (High Speed Dedicated Physical Control Channel)
- Transport Channel
  - HS-DSCH (High Speed Downlink Shared Channel)
- Multicode Operation in HSDPA
  - HS-SCCH-set Decoding
  - HS-DSCH Demodulation
HSDPA Basic Operation
- MAC-hs
- New Channels
- UE Scheduling
HSDPA Packet Switched Protocol Stack
- HSDPA Control Plane
  - Access Stratum Protocols
  - Non Access Stratum Protocols
  - MAC-hs
- HSDPA User Plane without MAC-c/sh
  - Configuration without MAC-c/sh
  - MAC-d entity – UE Side
  - MAC-hs entity – UE Side
  - MAC-d entity – UTRAN Side
  - MAC-hs – UTRAN Side
HSDPA Control and User Plane Extensions
- Control Plane Extensions
  - New NBAP, RRC & RNSAP IE’s
  - Radio Resource Sharing
  - Admission / Congestion Control
- User Plane Extensions
  - PDCP/RLC/MAC-d
  - Frame Protocol
HSDPA and DPCH Operation – HSDPA Setup
- HSDPA Setup via DPCH
- HSDPA Transmission and Retransmission
- Physical Channel Combinations supported with HSDPA on the same FDD Frequency
- Channel Type Switching with HSDPA
  - CELL_DCH & HSDPA
  - CELL_DCH ONLY
  - CELL_FACH
- HSDPA High Speed Information
  - H-RNTI
  - DL-HSPDSCH-Info
  - HS-SCCH Info
HSDPA Timing Relations
- Timing between HS-SCCH and HS-PDSCH
- HSDPA Downlink Timing
  - DPCH (Dedicated Physical Channel)
  - HS-SCCH (High Speed Shared Control Channel
  - HS-DSCH (High Speed Downlink Shared Transport Channel)
- HSDPA Uplink Timing
DCH / HS-DSCH Comparison
- Variable Spreading Factor
- Fast Power Control
- AMC
- Multicode Operation
- Fast Layer 1 Hybrid ARQ
- 16-QAM Modulation / Interleaving / Channel Coding Scheme
- TrCH Multiplexing
- Soft(er) Handover
Advantages and Disadvantages of HSDPA
- Advantages of HSDPA
- Disadvantages of HSDPA
- Disadvantages of HSDPA cont’d
Future Enhancements of HSDPA
Preview to HSUPA
- HSUPA – Areas of Improvement
- HSUPA – Less Beneficial Areas
- HSUPA Characteristics
  - Layer 1 Hybrid ARQ
  - Link Adaptation
  - Fast Transmission and Retransmission Scheduled by Node
- Importing Changes with HSUPA
  - 2 ms or 10 ms Subframe
  - New Physical Channels and Transport Channel
  - New MAC-es /MAC-e
  - New E-DCH Physical Layer Categories
- New Channels with HSUPA
  - E-DCH
  - E-DPDCH (E-DCH DPDCH)
  - E-DPCCH (E-DCH DPCCH)
  - E-HICH (E-DCH Hybrid ARQ Indicator Channel)
  - E-AGCH (E-DCH Absolute Grant Channel)
  - E-RGCH (E-DCH Relative Grant Channel)
- HSUPA Control Plane
  - MAC Architecture Change in HSUPA
- HSUPA User Plane
- MAC-e Details – UTRAN MAC Architecture
  - E-DCH Scheduling Option in MAC-e
  - E-DCH Control
  - De-multiplexing
- MAC-es Details – UTRAN MAC Architecture
  - Reordering Queue Distribution
  - Reordering
  - Macro diversity selection
  - Disassembly
- HSUPA MAC Interworking – MAC-d Flow
- NodeB Transmission Scheduling
  - AG (Absolute Grants)
  - RG (Relative Grants)
  - Non-Scheduled Transmission
- Achievable Data Rates in HSUPA – UE Categorie

The Physical Layer of HSDPA

Uplink HS-DPCCH Frame Structure
- HARQ-Ack
- Channel Quality Indication
- Uplink HS-DPCCH Spreading
  - Spreading
  - DPCCH / DPDCH / HS-DPCCH
  - Gain Factors
- Uplink Power Control including HS-DPCCH
- Uplink HS-DPCCH Coding Chain
  - Channel Coding for HS-DPCCH
- Uplink Transmission Delay T(0)
  Uplink / Downlink Timing at UE
  Uplink Fast Power Control – Reason for T(0)
- HS-SCCH / HS-DSCH and HS-DPCCH Timing (1)
- HS-SCCH / HS-DSCH and HS-DPCCH Timing (2)
- Delta ACK / NACK and ACK-NACK Repetition Factor
- Delta Ack / Nack and CQI Power
  - HS-DPCCH ACK / NACK and DTX Recognition
  - CQI Description and Task
- HS-DPCCH Measurement Feed Back Info - CQI
  - Measurement Power Offset
  - CQI Feedback cycle, k
  - CQI-Repetition-Factor
  - DeltaCQI
- CQI Reporting Principle
- CQI Mapping Table – UE Category
  - CQI Mapping Table for UE Categories 1 to 6
  - Example for a CQI Report
  - CQI Considerations
- CQI Reporting – Feedback Cycle and Repetition
HS-SCCH Frame Structure
- Part 1
- Part 2
  - TFRC and HARQ parameter
- HS-SCCH Coding Chain
  - RV Coding
  - MUX of HS-SCCH Part 1
  - MUX of HS-SCCH Part 2
  - HS-SCCH Channel Coding and Rate Matching
  - UE specific Masking of Part 1 bits
- UE Specific CRC Attachment for Part 1 and Part2
  - HS-SCCH Power Control
- UE Specific Masking for Part 1
  - HS-PDSCH Code Allocation through HS-SCCH Part 1
TFRI - Transport Block Size Mapping
- QPSK
- 16-QAM
- Stop & Wait HARQ Transition Diagram – NodeB
  - 1-Channel Stop and Wait
- HARQ Processes with N-Channel Stop and Wait
HARQ Process and New Data Indicator
- HARQ Process
- New Data Indicator
HS-PDSCH Frame Structure
- HS-DSCH Channelization Code Tree
- HSDPA Code- and Time Multiplex Operation
  - UE procedure for Receiving HS-DSCH
- HSDPA during Compressed Mode Operation
- Consequences of Using 16-QAM
  - Higher Throughput Rates
  - Increased Spectrum Efficiency
  - Higher Interference Vulnerability
  - Smaller Decision Space
  - 16-QAM Constellation Rearrangement
  - 16-QAM Constellation Rearrangement for b = 2 and b = 3
- Power Sharing between HSDPA and DCH
  - Node B Transmit Power
  - Maximum Transmission Power
  - UE Transmit Power
Adaptive Modulation and Coding
- Main Benefits of AMC
- Adaptive Modulation and Coding - Principle
- Physical Layer Processing Chain of AMC
  - Methods of selecting the suitable MCS
  - AMC Processing Chain
- AMC Liabilities
- HSDPA HARQ Types
  - Chase Combining
  - Partial IR
  - Full IR
- Operation of Chase Combining
- Operation of Partial IR
- Operation of Full IR
  - HARQ Transmissions / Retransmissions
- HARQ Type III – Partial IR and Chase Combing

Forward and Backward Error Correction in HSDPA

Turbo Coding
- Turbo Coder Principle
  - RSC Encoder
  - Interleaver
- Turbo Coder Structure
  - Trellis Termination for Turbo coder
  - Turbo Code internal Interleaver
- Iterative Decoding Principle
- HARQ Retransmission – Comparison with Legacy Releases
  - DCH
  - HS-DSCH
- Redundancy Version and Constellation Version
- HSDPA Category and Reference Combinations
  - Number of HARQ Processes versus IR Memory
- HARQ Information
HS-DSCH HARQ Functionality
- HARQ Parameters for Retransmissions
  - Transmission Parameters = Retransmission Parameters
  - Transmission Parameters <> Retransmission Parameters
- Rate Matching Tasks
  - First Rate Matching
  - Second Rate Matching
- First RM Stage
- Second Rate Matching Function
- RM Pattern Determination
  - Rate Matching Patterns
- Example for Initial Transmission-Self-decodable with 1st RM
  - 1st RM Puncturing
  - 2nd RM Puncturing
- Example for Retransmission – Non-self-decodable
  - Full IR
  - Partial IR
  - Example for Chase Combining
  - 2nd RM – Parameter Calculation Self-Decodable
  - 2nd RM – Bit Position Calculation Self-Decodable
  - 2nd RM – Self-Decodable Transmission followed by Full IR (1)
  - 2nd RM – Self-Decodable Transmission followed by Full IR (2)
  - 2nd RM – Parameter Calculation Non-Self-Decodable (3)
  - 2nd RM – Bit Position Calculation Non-Self-Decodable (4)
- Comparison between Full and Partial IR
- HARQ Performance Enhancement Techniques
HS-DSCH Interleaving
- DTX Indication Bits

HSDPA Protocol Enhancements and Extensions

Packet Scheduler in NodeB
Scheduling Strategies – Examples
- AMC Scheduling Function
- Comparison of Basic Packet Scheduler Methods
  - FT (Fair Throughput)
  - P-FR (Proportional Fair Resources)
  - M-C/I (Maximum C/I)
- Packet Scheduling Strategies
- Multi-User Selection Diversity – Dynamic Scheduling
  - MAC-hs Protocol
- MAC-hs - co-incident CRNC and SRNC
  - HS-DSCH RNTI
HSDPA Architecture – Evolution from Rel. ‘99 / Rel. 4
- Protocol Structure
- HS-DSCH Characteristics
- MAC-hs Tasks
- HS-DSCH MAC PDU
  - General
  - MAC-hs SDU
  - MAC-hs Header of MAC-hs PDU
- MAC-hs Entity UTRAN Side
- MAC-hs Entity UE Side
- HS-DSCH MAC Architecture – UTRAN Side
  - Overall Architecture
  - MAC-c/sh (optional)
  - MAC-d Flow in UTRAN
- HS-DSCH Architecture – UE Side
  - Overall Architecture
  - MAC-d Flow in UE
- HS-DSCH Bit Rate Measurement
- HARQ Process Details in UE – TSN, NDI and TBsize Index
  - Split HS-DSCH Block Functionality
- Transmitter and Receiver Stall Avoidance
  - Timer-Based Scheme
  - Window Bases Scheme
  - HARQ Activity Scheme
  - Timer and / or Window Based Stall Avoidance
- UE MAC-hs Other Functions
RRC Protocol Enhancement – New IE’s with HSDPA
- HS-PDSCH and DL TrCH Information
  - Activation Time
  - Downlink Transport Channel Type
- Added or Reconfigured MAC-d Flow
- Uplink DPCH Power Control Info and Others
HS-DSCH Data Frame on Iub/Iur
Control Frame Format for HS-DSCH FP
- HS-DSCH Capacity Request Control Frame
- HS-DSCH Capacity Allocation Control Frame
NBAP - HSDPA Message and IE Overview
- HS-DSCH Resources Information
- HS-DSCH’s MAC-d Flow To Rearrange
- HS-DSCH FDD Information
- HS-DSCH MAC-d Flows To Add
- HS-DSCH Information To Modify
- HS-DSCH MAC-d Flows To Delete
- NBAP - HSDPA Common Measurement Report
  - HS-DSCH Required Power Value Information
  - HS-DSCH Required Power Per UE Information
  - HS-DSCH Provided Bit Rate Value Information
- NBAP – HSDPA Radio Link Parameter Update Indication
- NBAP - HS-DSCH Related IE’s (1)
  - Allocation / Retention Priority
  - Priority Flow Information
- NBAP - HS-DSCH Related IE’s (2)
  - MAC-d PDU Size
  - UE Capabilities Information
- NBAP HS-DSCH Info Response
  - HS-DSCH Initial Capacity Allocation
  - HS-SCCH Specific Information Response
  - HARQ Memory Partitioning Information
- HS-PDSCH and HS-SCCH Power and Code Information
- HSDPA Cell Configuration - AUDIT
- HSDPA Data Transfer Procedure (1)
- HSDPA Data Transfer Procedure (2)

HSDPA Mobility Procedures

Introduction to HSDPA Mobility Procedures
- Serving HS-DSCH Cell Change
- Best Serving HS-DSCH Cell Measurement
  - Change of best Cell
  - HS-DSCH Handover
- Intra NodeB Synchronized HS-DSCH Cell Change
- MAC-hs Preservation
- HSDPA Reconfiguration during HS-DSCH Cell Change
  - H-RNTI during HSDPA Reconfiguration
  - MAC-hs Reset during HSDPA Reconfiguration
  - Reconfiguration of HARQ Processes and Reconfiguration of HARQ Memory Partitioning
  - Reconfiguration of DPCH timing offset DPCH, n for HS-DSCH serving cell
  - Change of HS-DSCH Serving Cell
  - Reconfiguration of transmission gap pattern sequence
  - Reconfiguration of Scrambling Code of uplink DPCH
  - Intra NodeB Synchronized HS-DSCH Cell Change Procedure
- Inter NodeB Synchronized Serving HS-DSCH Cell Change
  - Inter NodeB HS-DSCH Cell Change – Hard Handover (1)
  - Inter NodeB HS-DSCH Cell Change – Hard Handover (2)

v2.3

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