06 hsdpa principle

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

Apr. 2006

Node B Products of Huawei

Mar 2007

HSDPA PrincipleHSDPA Principle

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

ISSUE 1.1ISSUE 1.1


Chapter 1 HSDPA Basic Concept and Characteristic Chapter 1 HSDPA Basic Concept and Characteristic

Chapter 2 Key TechniquesChapter 2 Key Techniques

Chapter 3 Physical ChannelChapter 3 Physical Channel

Chapter 4 New Mac Entity for HSDPAChapter 4 New Mac Entity for HSDPA


HSDPA Basic Concept and characteristicHSDPA Basic Concept and characteristic

HSDPA= High Speed Downlink Packet AccessHSDPA= High Speed Downlink Packet Access

Important Features of 3GPP R5Important Features of 3GPP R5

HSDPA is the solution of WCDMA offering high speed downlink data HSDPA is the solution of WCDMA offering high speed downlink data serviceservice

Peak data rate in downlink : 14.4Mbps ( physical layer )Peak data rate in downlink : 14.4Mbps ( physical layer ) Shorter delayShorter delay High downlink code and power efficiency and greater downlink capacityHigh downlink code and power efficiency and greater downlink capacity Flexible cell resource allocationFlexible cell resource allocation More high speed user accessMore high speed user access


Chapter 1 HSDPA Basic Concept and CharacteristicChapter 1 HSDPA Basic Concept and Characteristic





Key Techniques - Overview

AMC Fast SchedulingHARQ（ Hybrid ARQ）

16QAMSF16, 2ms and CDM/TDM 3 New Physical Channels

Block 1 Block 2Block 1

Block 1?

Block 1Block 1?

+


CQI mapping table for UE category 10

CQI valueCQI value Transport Transport Block SizeBlock Size

Number of Number of HS-PDSCHHS-PDSCH ModulationModulation

Reference power Reference power adjustment adjustment

00 N/AN/A Out of rangeOut of range

11 137137 11 QPSKQPSK 00

22 173173 11 QPSKQPSK 00

………… ………… ………… ………… …………

1313 22792279 44 QPSKQPSK 00

1414 25832583 44 QPSKQPSK 00

1515 33193319 55 QPSKQPSK 00

1616 35653565 55 16-QAM16-QAM 00

1717 41894189 55 16-QAM16-QAM 00

1818 46644664 55 16-QAM16-QAM 00

………… ………… ………… ………… …………

2828 2337023370 1515 16-QAM16-QAM 00

2929 2422224222 1515 16-QAM16-QAM 00

3030 2555825558 1515 16-QAM16-QAM 00


HSDPA Key Techniques - HARQHSDPA Key Techniques - HARQ


- Enhanced partial Fairness (EPF) - Enhanced partial Fairness (EPF)

- Partial Fairness (PF) - Partial Fairness (PF)


HS-PDSCH Channel Slot Format

Slot #0 Slot#1 Slot #2

T slot = 2560 chips, M*10*2 k bits (k=4)

Data N data 1 bits

1 subframe: T f = 2 ms


HS-SCCH Channel Slot Format

Slot #0 Slot#1 Slot #2

T slot = 2560 chips, 40 bits

Data N data 1 bits

1 subframe: T f = 2 ms


HS-DPCCH Channel Slot Format

Subframe #0 Subframe # i Subframe #4

HARQ-ACK CQI

One radio frame T f = 10 ms

One HS-DPCCH subframe (2 ms)

2 T slot = 5120 chips T slot = 2560 chips


Associated Physical Channel - DPCH

Besides 3 physical channels on top. There is another physical Besides 3 physical channels on top. There is another physical channel named DPCH, which is a dedicated channel . DPCH is also channel named DPCH, which is a dedicated channel . DPCH is also called associated channel used for signalling transmission and power called associated channel used for signalling transmission and power controlcontrol

DPCH does not carry service generally, sometimes carry real time DPCH does not carry service generally, sometimes carry real time (RT) service such as AMR service ( CS+PS )(RT) service such as AMR service ( CS+PS )

Node B

UE

HS-PDSCH HS-SCCH DPCH HS-DPCCH


HSDPA Channel Mapping Transport Channels

DCH

RACH

CPCH

BCH

FACH

PCH

Physical Channels

Dedicated Physical Data Channel (DPDCH)

Dedicated Physical Control Channel (DPCCH)

Physical Random Access Channel (PRACH)

Physical Common Packet Channel (PCPCH)

Common Pilot Channel (CPICH)

Primary Common Control Physical Channel (P - CCPCH)

Secondary Common Control Physical Channel (S - CCPCH)

Synchronisation Channel (SCH)

Acquisition Indicat or Channel (AICH)

Access Preamble Acqu isition Indicator Channel (AP - AICH)

Paging Indicat or Channel (PICH)

CPCH Status Indicator Channel (CSICH)

Collision - Detection /Channel - Assig nment Indicator

Channel (CD /CA - ICH )

DSCH Physical Downlink Shared Channel (PDSCH)

HS-DSCH-related Shared Control Channel (HS-SCCH)

HS-DSCH High Speed Physical Downlink Shared Channel (HS-PDSCH)

Dedicated Physical Control Channel (uplink) for HS-DSCH (HS-DPCCH)


Physical Channel Timing


HSDPA Protocol Stack

Uu UE Node B

DTCH DCCH DTCH DCCH

MAC-d

MAC-hs

PHY

MAC-hs

PHY

HS-DSCH FP

AAL2 or UDP/IP

ATM or IP

ATM or IP

AAL2 or UDP/IP

HS-DSCH FP

MAC-d

CRNC/SRNC Iub

NodeB and UE would add a new protocol entityNodeB and UE would add a new protocol entity －－ Mac-hsMac-hs Mac-d would mapped DTCH/DCCH data to Hs-DSCH FP data and transmit the data tMac-d would mapped DTCH/DCCH data to Hs-DSCH FP data and transmit the data t

o Mac-hs entity in NodeB via transport network layer (TNL) o Mac-hs entity in NodeB via transport network layer (TNL) The main functions of Mac-hs entity is flow control between Mac-d entity and Mac-hs The main functions of Mac-hs entity is flow control between Mac-d entity and Mac-hs

entity (share Iub interface resource ), schedule user data in a cell and select proper trentity (share Iub interface resource ), schedule user data in a cell and select proper transfer format for a useransfer format for a user’s transport block (TB)’s transport block (TB)


The Functions of Mac-hs Entity

MAC-hs

MAC – Control

HS-DSCH

TFRC selection

Priority Queuedistribution

Associated DownlinkSignalling

Associated UplinkSignalling

MAC-d flows

HARQ entity

Priority Queuedistribution

PriorityQueue

PriorityQueue

PriorityQueue

PriorityQueue

Scheduling/Priority handling



Mac-hs entity has four sub-entities : Mac-hs entity has four sub-entities : flow control flow control

scheduling/priority handling scheduling/priority handling

HARQHARQ

TFRCTFRC

The main function of The main function of flow control sub-entityflow control sub-entity : : Control data’Control data’s flux between Mac-d and Mac-hss flux between Mac-d and Mac-hs

Reduce time delay and congestion in data transfer procedureReduce time delay and congestion in data transfer procedure

The main function of The main function of scheduling/priority handling sub-entityscheduling/priority handling sub-entity : : Set priority ,queue ID and data block ID base on channel feedbackSet priority ,queue ID and data block ID base on channel feedback

(ACK / NACK) ,resource and data(ACK / NACK) ,resource and data



The main function of The main function of HARQ sub-entity :HARQ sub-entity : Deal with HARQ and support SAW protocol (stopping and waiting )Deal with HARQ and support SAW protocol (stopping and waiting )

One HARQ entity can deal with one userOne HARQ entity can deal with one user’s ’s several HARQ processseveral HARQ process

There is only one HARQ process in HS-DSCH in one TTIThere is only one HARQ process in HS-DSCH in one TTI

The main function of The main function of TFRC (TFRC (Transport Format and Resource CombinationTransport Format and Resource Combination) ) sub-entity :sub-entity : Select the proper TF base on resourceSelect the proper TF base on resource


Implementation of Mac-hs

HS-DPCCH demodulation and decode

SRNC(MAC-d)

power monitor

CQI adjustment

Scheduler

Queues/flow control

HARQ

TFRC

Power management

Coding and modulation

OM parameters

Power limitation

Power for HSDPA

CQI Value

Stat. Of ACK/NACKACK/NACK

Waiting time

Queue filling info Queue priority

CQI ValueCode allocation

Code available

Data flow

Control signal


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06 hsdpa principle

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