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HSDPA Overview. By: Syed Asif Hussain Shah Mohammad Reza Akhavan 10th March, 2005 Networking Project. Agenda. High Speed Downlink Packet Access (HSDPA) Major work item for Release 5 in 3GPP HSDPA provides impressive enhancements over WCDMA for the downlink

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hsdpa overview

HSDPA Overview

By:

Syed Asif Hussain Shah

Mohammad Reza Akhavan

10th March, 2005

Networking Project

agenda
Agenda
  • High Speed Downlink Packet Access (HSDPA)
  • Major work item for Release 5 in 3GPP
  • HSDPA provides impressive enhancements over WCDMA for the downlink
    • WCDMA 2 Mbps  HSDPA 14 Mbps (with MIMO ~ 20)
  • UMTS network architecture
umts network architecture

RNC

RNC

UMTS Network Architecture

Uu

Iu PS

Iub

  • UMTS = Universal Mobile Telecommunications System
  • UTRAN = UMTS Terrestrial Radio Access Network
  • UE = User Equipment
  • RNC = Radio Network Controller
  • RNS = Radio Network Subsystem (RNC & Bs)
  • SGSN = Serving GPRS Service Node
  • GGSN = Gateway GPRS Service Node

SGSN

GGSN

IP Networks

Iur

Gi

Gn

UE

Core Network

Node B

UTRAN

hsdpa features
HSDPA features...
  • Reduction of information frame
  • Feedback of reception quality (CQI)
  • Adding new features:
    • 3 Channels
    • HARQ
    • AMC
    • MIMO
    • FCS
hsdpa channels
HSDPA Channels
  • High Speed Physical Downlink Shared Channel (HS-PDSCH)
    • HS-Downlink Shared Channel (HS-DSCH)
    • HS-Shared Control Channel (HS-SCCH)
  • High Speed Dedicated Physical Control Channel (HS-DPCCH)

HS-DPCCH: CQI

HS-SCCH DL Transfer Information

HS-DSCH Data Transfer

HS-DPCCH, ACK, NACK

hs downlink shared channel hs dsch
HS - Downlink Shared Channel (HS-DSCH)

Shared channel transmission

amc adaptive modulation coding
AMCAdaptive Modulation & Coding
  • Modulation & coding depends on channel quality condition
  • Modulation Schemes:
    • QPSK
    • 16QAM
  • Different Code Rates used
h arq hybrid auto repeat request
H-ARQHybrid – Auto Repeat reQuest
  • Provide Link Layer Retransmissions
  • Moved From RNC to Node-B
  • Use two Schemes Chase Combing and Incremental Redundancy
mimo multiple input multiple output
MIMOMultiple Input Multiple Output
  • Is based on multipath environment
  • Used just in downlink
  • Used in further away from the base station
fast cell site selection fcs
Fastcell site selection (FCS)
  • Tracking of active set of Node B‘s connected to a UE
  • Operate by monitoring SIR (Signal-to-Interference Rate) level of all Bs
  • Selection of the Node-B with the best current transmission characteristics
  • High data rates can be achieved