Wr Bt05 e1 1 Hsdpa Technology-46

5/19/2018 Wr Bt05 e1 1 Hsdpa Technology-46

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HSDPA Technology

ZTE University


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Content

Driver to HSDPA

HSDPA TheoryHSDPA Terminal & Commercial Application

HSDPA Solution

HSDPA Evolution


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Competition to operator

Introduce HSDPAto WCDMA

Introduce HSDPAIntroduce HSDPA

to WCDMAto WCDMA

2.5G GPRS: 9.05 -171.2kbit/s,

Service deployment is bad

CDMA2000 1x: 153.6kbit/s,

Service deployment is good

3G

CDMA 1x EV-DO: 2.4Mbit/sWCDMA R99/R4: 2Mbit/s

Peak data rate (Kbps)

Mean data rate (Kbps)

R9R9R9R9

9999


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The driver to HSDPA

High Speed Downlink Packet Access HSDPA is a new technology to enhance WCDMA PS data

service HSDPA gives subscribers new experience of more higher

speed data service with shorter time delay HSDPA brings more bandwidth and more online

subscribers It is necessary and feasible to introduce HSDPA to

WCDMA network With consideration of network planning and deployment

cost, HSDPA should be applied at the beginning, or atleast the Node B should hardware ready for HSDPA

HSDPA brings new requirement of transmission andnetwork planning. Pay more attention to it


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HSDPA, Mature technology

2002.6 R5 released

2003.6 HSDPA (High Speed Downlink Packet Access) was added

into R5

2002.6 R5 released

2003.6 HSDPA (High Speed Downlink Packet Access) was added

into R5

HSDPA is smoothly evolved from WCDMA R99 without any big effectto the existing R99 network

1 new transport channel: HS-DSCH

3 new physical channelsHS-PDSCH, HS-SCCH and HS-DPCCH MAC-hs sub-layer, HARQ (Fast Hybrid Automatic Repeat reQuest), Fast

Scheduling and AMC (Adaptive Modulation and Coding)

HSDPA is smoothly evolved from WCDMA R99 without any big effectto the existing R99 network

1 new transport channel: HS-DSCH

3 new physical channelsHS-PDSCH, HS-SCCH and HS-DPCCH MAC-hs sub-layer, HARQ (Fast Hybrid Automatic Repeat reQuest), Fast

Scheduling and AMC (Adaptive Modulation and Coding)

HSDPA --Max. downlink data rate: 14.4Mbps


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Competition advantage of HSDPA

Standard Data rate (Mbps) Subscribers per cell

WCDMA R99/R4 2M31PS64k, 15PS128k or

7PS384k

(SF=32, SF=16 or SF=8)

HSDPA 14.4

64

(117.7kbps per user, SF=16, R=3/4,16QAM)

CDMA2000 1x EV-

DO2.4

59

(only tens of kbps, 200kbps when 8

users is configured)

HSDPA supports more users while provides higher data rate!HSDPA supports more users while provides higher data rate!


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Perspective of HSDPA application

HSDPA Modem

HSDPA fixed terminal

Flexible access

HSDPA Modem

HSDPA fixed terminal

Flexible access

Higher data rate

More users

Richer service

Obvious advantage to compete withother 3G technology like CDMA2000

Higher data rate

More users

Richer service

Obvious advantage to compete withother 3G technology like CDMA2000

HSDPA data cardHSDPA PDA

Mixed with WMAN (WiMAX)and WLAN (Wi-Fi), more advantage ofbroadband wireless access

HSDPA data cardHSDPA PDA

Mixed with WMAN (WiMAX)and WLAN (Wi-Fi), more advantage ofbroadband wireless access

HSDPA handset

HSDPA Modem

HSPDA data card

HSDPA PDAWCDMA R99/R4 coverage

HSDPA coverage

HSDPA, roundly improves the value of WCDMA network


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Content

Driver to HSDPA


HSDPA Solution

HSDPA Evolution


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Evolve from R99/R4 to HSDPA

L2

L1

DSCH

FP

RLC

L2

L1

DSCH

FP

Iub/ Iur

PHY

MAC

PHY

RLC

Uu

MAC-d

HS-DSCHFP

HS-DSCHFP

MAC-hs

PHY(add 3

channels)

RNC, Node B: add HS-DSCH FP protocol process, involve Iub/Iur

Node B: add MAC-hs, responsible for AMC, HARQ, etc.

Node B: add 3 physical channels: HS-PDSCH,HS-SCCH,HS-DPCCH

UE: add MAC-hs, physical channels and process, modulation

MAC(add

MAC-hs)

PHY(add

process)

UEUEUEUE UTRANUTRANUTRANUTRAN


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New physical channels of HSDPA

HS-PDSCH is the bearer of HS-DSCH, transfer HSDPA user data (downlink) 2ms TTI, 3slots, spread factor is fixed to 16, multiple users & multiple codes, modulation method:QPSK and 16QAM

HS-SCCH bears information of HS-DSCH such as UE specialized mask code,

modulation and coding policy, etc. (downlink) 2ms TTI, 3 slots, spread factor is fixed to128

HS-DPCCH bears feedback information of HS-PDSCH such as Channel QualityIndication (CQI), H-ARQ confirm information ACK/NACK, etc. (uplink) 2ms TTI, 3 slots,spread factor is fixed to 256

R99 channel

HSDPA channel

DCCH(Signaling) + UL DTCH (PS traffic)

DL DTCH (PS traffic)


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HSDPA working procedure

RNCNode B

(AMC and HARQ)

Data Packet

ACK/NA

CKHS

-DPCC

H

Data

packe

t+re-se

nd(ifn

eed)

(HS-DS

CH)

AMC, modulation and coding selection

HARQ, lowers the time delay, improvesthe data throughput

Fast scheduling, quick decision

CQI

HS-DPC

CH

HS-D

SCHp

arame

ters(HS-SCC

H)

Data

(HS-DS

CH)

Evaluation, HS-DSCH parameters setting

Receive data from HS-DSCHaccording to DetectingHS-SCCH


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Key technology: AMC (1)

Adaptive Modulation andCoding (AMC), Node B can

adjust modulation (QPSK,16QAM) and coding rate (1/3,3/4, etc) in time according tothe feedback channel statefrom UE. So datatransferring can follow thestep of channel statechanging in time, it is a goodtechnology for link self-adaptive

For long time delay packet

data, AMC can improvesystem capacity without addinterference to neighbor cells

Standard AMC Remark

R99/R4 N Quick power control

HSDPA Y Satisfy 15dB SIR dynamic range


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Node BNode B

CQI (Report periodically)CQI (Report periodically)

Modulation (QPSK, 16QAM) self-adaptiveGood channel state: 16QAMBad channel state: QPSK

Coding rate (1/3, 3/4, etc.) self-adaptiveGood channel state: 3/4

Bad channel state: 1/3

Efficiently utilize the channel condition

Good channel state: higher speedBad channel state: lower speed

Codes adjustingGood channel state: more codesBad channel state: fewer codes


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HSDPA, the service bearing ability of one channel is further larger thanR99/R4 by using more efficient modulation and coding rate, while SF istwice as R99/R4

As using bigger SF, system can support more users

Standard Data rate (kbps) SF Modulation Coding rate

R99/R4 384 8 QPSK 1/2

HSDPA 720 16 16QAM 3/4

HSDPA, R99/R4 channel bearing ability comparisonMultiple coding rates


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Modulation

coding rate

Data rate

(1 code)

Data rate

(5 codes)

Data rate

(15 codes)

QPSK 1/4 120kbps 600kbps 1.8Mbps

QPSK 1/2 240kbps 1.2Mbps 3.6Mbps

QPSK 3/4 360kbps 1.8Mbps 5.4Mbps

16QAM 1/2 480kbps 2.4Mbps 7.2Mbps

16QAM 3/4 720kbps 3.6Mbps 10.8Mbps

HSDPA throughput, relative with modulation & coding rate

HSDPA can provide data rate per user up to 10.8Mbps (16QAM,3/4) by AMC and multiple codes technology

In the situation of high speed, HSDPA requires high channel

condition

Multiple coding rates


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Key technology: HARQ (1)

Hybrid Automatic Repeat reQuest

(HARQ) is a combined technology withForward Error Correction (FEC) andAutomatic Repeat reQuest (ARQ)

HARQ can provide flexible and subtleadjustment for its process by

cooperated with AMC

Standard HARQ Remark

R99/R4 NFEC is in high layer

ARQ is in RLC layer, channel feedback is slow

HSDPA YIncludes physical layer HARQ and HARQ entity in

MAC-hs

L1 HARQ

HARQ

MAC-hs

TFRC

L1L2


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Key technology: HARQ (2)

Advantage: improve transferring reliabilityDisadvantage: lower utilization in bad

channel state

Advantage: good performance inlower Bit Error Rate (BER)

Disadvantage: bad performance inhigh BER

FEC

ARQ

HA

RQ

Combine FEC and ARQ, eachsending packet includes error

detection bit and error correction bit

Pack

etAc

onfirm

Packet

Acon

firm

Error packet A

Packet A

Packet A

Error packetA

Packet A

Packet Amissing data

PacketAmissingdata

HARQ phase I

Resending is in RNCR99

HARQ phase II, III

Resending is in Node B, HSDPA

Packet A

Discard Reserve

Resendwhole packet Resent data

Soft combination

Rese

ndrequire

ment

Rese

ndrequire

ment

Packet BPacket B

Send SendReceive Receive

Lower efficiencyLonger time delay

Higher efficiency

Shorter time delay


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Key technology: Quick scheduling (1)

With quick channel

feedback, HSDPA

can suitably adjust

coding rate, codes,

modulation, etc. in

time according to

the channel state

Standard TTI (ms)

Channel feedback

time delay (ms) Remark

R99 10 100 (at least)

HSDPA 2 5.67

Supports continuous

feedback, R5 also

supports 10ms TTI

HS-PDSCH

HS-SCCH

HS-DPCCH (ACK/NACK and CQI)

HS-SCCH

2 TS 7.5 TS +/- 128 Chip N TS

1 TS = 2560 ChipHSDPA channel

feedback time delay

is about 8.5 TS

Quick channelfeedback


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Key technology: Quick scheduling (2)

Scheduling policy

Time fairness

Traffic fairness

Max-C/I

Proportional fairness

Every user get equal service time, but the trafficmaybe not equal, the fairest algorithm but has the

lowest traffic

Every user get the same traffic, but the timemaybe not equal, has the lower utility of systemresource because it will schedule the UE with

bad channel state

Only the user in best channel state (biggest C/I)will get the service priority in each turn, thebiggest traffic but has the worst fairness

Weighted compromise of above algorithms andhas bigger system traffic and better servicefairness


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Advantage of HSDPAComparing item R99/R4 HSDPA

System capacity (Mbps) 2.668 14.4

Spectrum efficiency

(Kbit/(MHz*Cell))537.6 2795.2

System handoverInter-frequency hard HOIntra-frequency soft HOIntra-frequency softer HOInter-system HO (GSM)

Only hard handover

Power controlOpen loop, Close loop (Inner loop, Outer loop)

PC, Quick, Slow PCHS-PDSCH adopts slow PC or even

no power control

Modulation QPSK QPSK, 16QAM

Link adaptive technology Quick PC and soft HOAMC, HARQ, Short TTI and Quick

channel feedback

MAC-hs N/A For faster scheduling

Provides various speedwith stable power

(stable power,adjustable speed)

Adjust power toguarantee service speed

(stable speed,adjustable power)

HSDPA R99/R4


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Content

Driver to HSDPA


HSDPA Solution

HSDPA Evolution


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Terminal Changing caused by HSDPA

Powerful 3G terminalsMuch more powerful, attractive HSDPA terminals

faster processor

larger memory

advanced receive and process algorithm 16QAM demodulation, multiple decoding

MAC-hs process

multiple codes

HSDPA terminal, first choice for high-end commercial application


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HSDPA PC card (MU330)

Functions

WCDMA 2.1GHz, GSM900/1800/1900

WCDMA 384KDL/128KUL, GPRS Class 10 SMS, Voice

HSDPA

ETSI AT command interface

OS: Windows 2000, XP

Language: Chinese, English, etc.

3V SIM/USIM card


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HSDPA handset (Q508)

Functions

WCDMA, GSM900/1800/1900

WCDMA 384DL/128KUL, GPRS Class 10

Voice, MMS, WAP, Email, JAVA, Download

Video phone, Streaming media, PTT

LCS (A-GPS)

MP3/MPEG4

Blue tooth/USB/mini-SD

HSDPA

Specs

Dual camera (2000K pixels)

Dual LCD: 260K colors

Main LCD: 2.2240320

MIDI: 72 chord


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HSDPA terminal category and capability

UE category Maximumchannels MinimalTTI interval Maximum servicespeed (Mbps) Modulation

Category 1-6 5 3 - 1 1.2~3.65

QPSK16QAM

Category 7 10 1 7.2

Category 8 10 1 7.2

Category 9 15 1 10.12

Category 10 15 1 14.4

Category 11-12 5 2 1.8 QPSK

Different UE supports various channels, minimal TTI and other parameters

UE listed in Category 11 is in worst receive capability, Category 10 is the best

HSDPA terminal

HSDPA handset HSDPA pc card HSDPA PDA


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HSDPA commercial process

Terminals

2005 2Q, several manufacture promote HSDPA trial version terminal

2005 4Q, promote commercial HSDPA terminal

Operator to deploy HSDPA

Cingular plan to deploy HSDPA in major city, 2006; till the end of 2006, toprovide the HSDPA service in most part of metropolitans.

NTT Docomo will deploy HSDPA in first quarter 2006; In UK, mmO2 willlaunch the service in fourth quarter 2005in HK H3G will provide commercialservice in first quarter 2006

Terminals

2005 2Q, several manufacture promote HSDPA trial version terminal

2005 4Q, promote commercial HSDPA terminal

Operator to deploy HSDPA

Cingular plan to deploy HSDPA in major city, 2006; till the end of 2006, toprovide the HSDPA service in most part of metropolitans.

NTT Docomo will deploy HSDPA in first quarter 2006; In UK, mmO2 will

launch the service in fourth quarter 2005in HK H3G will provide commercialservice in first quarter 2006

HSDPA standard has been determined

HSDPA has adequate test instruments

HSDPA technology has been tested in application

Manufactures has provided HSDPA commercial terminals in 2005

USA, Japan and the other operators start the HSDPA network construction

ZTE equipment are HSDPA ready


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High data service brings new experience

Colorful emailColorful emailMulti-access

Multi-access

This resturant looks

nice! Yeah, lets gothere tomorrow.

Adopt the HSDPA, operator can provide higher bandwidth service.

To deploy new service.

Multimedia DownloadMultimedia Download

NEWSNEWS MOVIEMOVIE MUSICMUSIC

Cartoon mailCartoon mail


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Content

Driver to HSDPA


HSDPA Solution

HSDPA Evolution


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HSDPA link budget R99/R4 link budget

Mode1 Mode2 Mode3 CS12.2 CS64 PS384

TX

NodeB TX power 40 40 40 27 30 38

Antenna gain 18 18 18 18 18 18

Cable loss 2 2 2 2 2 2

EIFR 56 56 56 43 46 54

RX

Thermal noisedensity

-174 -174 -174 -174 -174 -174

Thermal noise -108.157 -108.157 -108.157 -108.1566878 -108.1566878 -108.157

Noise figure 5 5 5 5 5 5

Interferencemargin

3 3 3 3 3 3

Service rate 423 368 635 12.2 64 384

Code number 5 4 5 1 1 1

Process gain 19.579909 10.18483 7.815575 24.9797 17.7815125 10

Eb/No 9 9 9 7.2 7.1 6.4

Rx sensibility -100.737 -101.342 -98.9723 -117.9364017 -110.8382003 -103.757

UE antenna gain 0 0 0 0 0 0

Body loss 0 0 0 2 0 0HSDPA can achieve the same coverage as R99/R4 under same data rate

Link budget for HSDPA


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HSDPA link budget R99/R4 link budget

Mode1 Mode2 Mode3 CS12.2 CS64 PS384

Others

Fast fadingmargin

0 0 0 2 2 2

Soft handover

gain0 0 0 2 2 2

Fading deviation 8 8 8 8 8 8

Penetration loss 20 20 20 20 20 20

Max path loss 128.7366 129.3415 126.9723 130.9364017 128.8382003 129.7567

HSDPA can achieve the same coverage as R99/R4 under same data rate

Link budget for HSDPA


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HSDPA construction solution

Networkconstruction

plan

Frequencypoint

assignment

Resource condition Advantage anddisadvantage

Recommendeddeployment

Intra-frequencyplan

F1:HSDPA+R99/R4

Less inter-frequencyhandover, admissioncontrol, load controland power control canbe achieved within onesame frequency cell.

Advantage:easy to do resourcecontrol

Disadvantage: donot have user detailclassification

After the networkconstructionfinished, toachieve the highdemand of voiceand PS downlink.

F2:HSDPA+R99/R4

Inter-frequencyplan

F1: R99/R4

Situation I: if HSDPAfrequency point supportnormal handset, all theresource have to beassigned within variousdifferent frequency cells.

Situation II: HSDPAfrequency point areonly used for PC card,resource managementcan be achieved moreeasily.

Advantage:voice user +HSDPAusers get goodservice

Disadvantage:resource control willbe difficult insituation I, maybesome frequencypoint resource willbe wasted at thebeginning

With thedevelopment of3G, to providededicatedfrequency pointfor HSDPA PCcard (only PSdomain)

F2: HSDPA


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ZTE HSDPA construction solution

If necessary, use acarrier only to supportPS data

HSDPA

(PC card)

f1 f2 f3

R99/R4+

HSDPA

R99/R4+

HSDPA

Phase I, IIPhase I, IIPhase I, IIPhase I, IIPhase IIIPhase IIIPhase IIIPhase III

ZTE solutionZTE solutionZTE solutionZTE solution

HSDPA construction area

Phase I :several hot spots,and the important buildingto deploy HSDPA

Phase II :all the hot spot andseveral macro sites to deploy HSDPA


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Network analysis for HSDPA and R99/R4

After the 3G network construction, the basic demand of WCDMA network

should adopt HSDPA function, with soft smooth upgrade ability.

HSDPA is not constructed as a individual network, HSDPA is a enhanced

technology of WCDMA (throughput, users)

Network construction and plan for R99 and HSDPA based on the one-shot

planning, multi-stage deployment

HSDPA and R99 share the same network, Node B supports HSDPA

function

At dense traffic area (capacity is restricted), HSDPA can share the

same site of R99 and achieve the same coverage of it.

Capacity and coverage is a balance relationship, increase the network

performance to the maximum by making a balance between them.

After the 3G network construction, the basic demand of WCDMA network

should adopt HSDPA function, with soft smooth upgrade ability.

HSDPA is not constructed as a individual network, HSDPA is a enhanced

technology of WCDMA (throughput, users)

Network construction and plan for R99 and HSDPA based on the one-shot

planning, multi-stage deployment

HSDPA and R99 share the same network, Node B supports HSDPA

function

At dense traffic area (capacity is restricted), HSDPA can share the

same site of R99 and achieve the same coverage of it.

Capacity and coverage is a balance relationship, increase the network

performance to the maximum by making a balance between them.


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HSDPA for major area

Area type Square (km2) Erl

Dense urban 91.5 3527

Urban 179.78 4873

Suburb 3000.5 2100

total 3271.78 10500

Major area have

no more than10% proportion

Major areaoccupy

80% traffic

Fully HSDPA

coverage formajor area!

Major areaMajor areaMajor areaMajor areadense urban + urbandense urban + urbandense urban + urbandense urban + urban


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HSDPA outdoor coverage

Node BNode B

Adaptive modulationGood channel state: 16QAM

Adaptive coding rate

Good channel state: 3/4

AMC

HSDPA requires a good channel condition for high speed service:

Good channel state

Near to Node B

At beginning, HSDPA is suitable for micro Node B coverage of outdoor hotspots.

Micro Node B is more suitable for HSDPA


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HSDPA indoor coverage

HSDPA indoor coverageHSDPA indoor coverage

CBD (focus on)

Office, hotel, etc

Shopping center, airport, etc

Macro Node BIndoor distributed system

Macro Node B/base band poolRRU

Indoor distributed system

Micro Node BIndoor distributed system

Pico

Solution

Transmission

PicoB01C

R8840

Powerdistributor

Twistedpair

Fiber

Feeder

Macro Node B or

base band pool

Concern of HSDPA indoor coverage

Is the existing indoor distributed systemof R99/R4 suitable for HSDPA?

Is capacity of the existing indoor

distributed system enoughIs the

transmission enough?

the indices of indoor distributedcomponents (like power distributor)

required by HSDPA and R99 are same,So the existing indoor distributed system

of R99/R4 is suitable for HSDPA

the indices of indoor distributedcomponents (like power distributor)

required by HSDPA and R99 are same,So the existing indoor distributed system

of R99/R4 is suitable for HSDPA


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Control

HSDPA Processor

DL Coder

DL Base-band

HSDPA Processor

UL Decoder

UL Base-band

Mid-frequency

After HSDPAUpdate

Before HSDPA

Update

After HSDPA

Update

Before HSDPA

Update

Iub Interface

FeaturesFeatures

Advanced designHSDPA

functions have been embedded

into hardware.

Just update software to support

HSDPA functions.

No additional hardware is needed!

ZTE serialized Node B support HSDPA flexible

update


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HSDPA functions have already been embedded into ZTE serialized Node B

hardware. The base-band processing chip supports 16QAM modulation. Only

software update is needed for Node B to support HSDPA.

Powerful base-band processing ability. For the case of updating the R99 cell into

R99/HSDPA, no more base-band processing board is needed for Node B.

As for RNC and CN, the introduction of HSDPA will only increase the data traffic

which means only additional interface hardware resource are needed.

ZTE Node B is designed based on the most advanced

HSDPA technology in the world. It is absolutely ensured

that to upgrade from R99 to HSDPA, no board is

required to be changed! The base-band processing

board also possesses a unique feature that is itsupports the networking of HSDPA and R99 with either

the same carrier or not! The most advanced base bandprocessing in the world!

The most advanced base bandprocessing in the world!

ZTE Node B hardware support HSDPA


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B09 indoor macro: support up to 3C3S and 6CS RRU

B09A outdoor macro: support up to 3C3S and 6CSRRU

B06C/B03C indoor/outdoor micro: support up to2C3S/3C1S.

B03R indoor/outdoor RRU: support up to 3C1S

B09B09

BBUBBBUB

B06CB06C

B03C/B03RB03C/B03R

B09AB09AB01CB01C

ZTE serialized Node B totally support HSDPA

BBUA indoor/outdoor base-band pool: maximum processing capacity is up to15CS

B01C pico Node B: 1C1S configuration


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Content

Driver to HSDPA

HSDPA Theory

HSDPA Terminal & Commercial Application

HSDPA Solution

HSDPA Evolution


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Mobile Communication Development

Mobile communication is developed from 2G3G3.9G. It isdeveloped from mobile voice service to high speed data service.

Currently it is developed to 3.5G. For WCDMA, commercial R5 versionand trial R6 version can be provided now.

3GPP is working on the standards of R7/HSPA+ and R8/LTE. It isestimated that R7 will be finalized on 2007 and R8 will be finalized on 2008.

The development of radio technology pays more attention to therequirement of operator NGMN organization proposed the system

development goal.


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Mobile Communication Technology Evolution

2G 2.5G 3G 3.5G 3.75G 3.9G2.75G

GSM

WCDMA

R99GPRS

EDGE

HSDPA HSUPA

HSPA+

LTE

IS-95CDMA20001X EV-DO

CDMA2000 1X

EV-DORev. A

EV-DORev. B

AIE

CDMA20001X EV-DV


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WCDMA Roadmap

GSMGPRS/EDGE

GSMGPRS/EDGE

3GR99

3GR99

3G+HSDPADownlink Enhanced

3G+HSDPADownlink Enhanced

3GHSDPA/HSUPA

Downlink/UplinkEnhanced

3GHSDPA/HSUPA

Downlink/UplinkEnhanced

GSM(GPRS/EDGE)GSM(GPRS/EDGE)

3G3GEnhanced UMTSEnhanced UMTS

Optimized UMTSOptimized UMTS

NGMNNGMN

NGMNLTE,Broadband radio

IP based widebandPeer to Peer

NGMNLTE,Broadband radio

IP based widebandPeer to Peer

2002-3 2003-4 2005-6 2007-9 After 2009Year

DLthroughput

64-144kbps 64-384kbps 384kbps-4Mbps 384kbps-7Mbps 20-50Mbps


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ZTE HSDPA solution conclusion

ZTE serialized Node B is alreadyhardware ready for downlink14.4M, only software upgrade isneeded

ZTE RNC and CN, unified platform,80G switching capability, highintegration, high capacity, smoothevolution, to ensure thedeployment of HSDPA

HSDPA can share carrier withR99/R4, or use a exclusive carrier Support handover between

HSDPA, R99/R4 and 2G Support simultaneous service of

HSDPA and voice (or videotelephony)

Support at least 64 users per cell HSDPA can share base band

board with R99/R4

All the Node Bs support HSDPAAll the Node Bs support HSDPA


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Exercise

pls describe the differentia of HSDPA and R4.

HSDPA introduces new physical channels, they

are ( ) ( ) ( ). pls describe the key technology of AMC

pls describe the key technology of HARQ.

pls write down the main quick scheduling methods.


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Wr Bt05 e1 1 Hsdpa Technology-46