Công nghệ HSDPA và ứng dụng

HSDPA Technology

ZTE University
TD&W&PCS BSS Course Team


Content

Driver to HSDPA
HSDPA Theory
HSDPA Terminal and Commercial
Situation
HSDPA Solution


Driver to HSDPA

Competition to operator
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/s
WCDMA R99/R4: 2Mbit/s

R9
9
Peak data rate (Kbps)

Mean data rate (Kbps)

Introduce
Introduce HSDPA
HSDPA
to
to WCDMA


Driver to HSDPA

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 at least the Node B should
hardware ready for HSDPA



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


Driver to HSDPA

HSDPA, Mature technology
2002.6 R5 released
2003.6 HSDPA (High Speed Downlink Packet Access) was added into R5

HSDPA --Max. downlink data rate: 14.4Mbps

HSDPA is smoothly evolved from WCDMA R99 without any big effect to the existing
R99 network
 1 new transport channel: HS-DSCH
 3 new physical channels ： HS-PDSCH, HS-SCCH and HS-DPCCH
 MAC-hs sub-layer, HARQ (Fast Hybrid Automatic Repeat reQuest), Fast Scheduling

and AMC (Adaptive Modulation and Coding)


Driver to HSDPA

Competition advantage of HSDPA
Standard

Data rate (Mbps)

Subscribers per cell

WCDMA R99/R4

2M

31×PS64k, 15×PS128k or 7×PS384k
(SF=32, SF=16 or SF=8)

14.4

64
(117.7kbps per user, SF=16, R=3/4,
16QAM)

HSDPA

CDMA2000 1x EVDO

2.4

59
(only tens of kbps, 200kbps when 8
users is configured)

HSDPA supports more users while provides higher data rate!


Driver to HSDPA

Perspective of HSDPA application

HSDPA handset

HSDPA coverage
HSDPA Modem

HSPDA data card

WCDMA R99/R4 coverage

HSDPA PDA

Higherdata
datarate
rate
Higher
Moreusers
users
More
Richerservice
service
Richer
Obviousadvantage

advantagetotocompete
competewith
with
Obvious
other3G
3Gtechnology
technologylike
likeCDMA2000
CDMA2000
other
HSDPAModem
Modem
HSDPA
HSDPAfixed
fixedterminal
terminal
HSDPA
Flexibleaccess
access
Flexible
HSDPAdata
datacard
card
HSDPA
HSDPAPDA
PDA
HSDPA
Mixedwith
withWMAN
WMAN(WiMAX)

(WiMAX)
Mixed
andWLAN
WLAN(Wi-Fi),
(Wi-Fi),more
moreadvantage
advantageofof
and
broadbandwireless
wirelessaccess
access
broadband

HSDPA, roundly improves the value of WCDMA network


Content
Driver to HSDPA
HSDPA Theory
HSDPA Terminal and Commercial
Situation
HSDPA Solution


HSDPA Theory

Evolve from R99/R4 to HSDPA
UE

RLC

RLC

UTRAN

MAC

MAC-d

MAC
(add
MAC-hs)

HS-DSCH
DSCH
FP
FP

HS-DSCH
DSCH
FP
FP

L2

L2

L1

L1

MAC-hs

PHY
PHY
(add 3
channels)

PHY
PHY
(add
process)
Uu

Iub/ Iur

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


HSDPA Theory

New physical channels of HSDPA
DCCH（信令）＋UL DTCH（PS业务）
DPCH
HS-PDSCH
CN

UE

UTRAN
HS-DPCCH
DL DTCH (PS业务)

R99 channel
HSDPA channel

 HS-PDSCH is the bearer of HS-DSCH, transfer HSDPA user data (downlink) 2ms TTI, 3
slots, 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 to 128
 HS-DPCCH bears feedback information of HS-PDSCH such as Channel Quality Indication
(CQI), H-ARQ confirm information ACK/NACK, etc. (uplink) 2ms TTI, 3 slots, spread factor
is fixed to 256


HSDPA Theory

HSDPA working procedure
②Evaluation, HS-DSCH parameters setting

④Receive data from HS-DSCH
according to Detecting
HS-SCCH

）
)

CH
C
CH
P
C
D
S
SHS
H
(
（
s
QI
ter H)
C
e
①
ram -DSC
pa
S
CH ta (H
S
D
Da
SHS
③H
（
d)
K
ee

C
n
）
A
(if
/N CH
d
K
n
C
C P
e
⑤A D
e- s
)
r
CH
t+
S
e
k
D
ac
Sp
H
(
ata
⑥D

Data Packet

Node B
(AMC and HARQ)

RNC


 AMC,
AMC,modulation
modulationand
andcoding
codingselection
selection

 HARQ,
HARQ,lowers
lowersthe
thetime
timedelay,
delay,improves
improvesthe
the
data
datathroughput
throughput

 Fast
Fastscheduling,
scheduling,quick
quickdecision

decision


HSDPA Theory

Key technology: AMC (1)

Standard

AMC

Remark

R99/R4

N

Quick power control

HSDPA

Y

Satisfy 15dB SIR dynamic range



Adaptive Modulation and
Coding (AMC), Node B can
adjust modulation (QPSK,

16QAM) and coding rate (1/3,
3/4, etc) in time according to the
feedback channel state from UE.
So data transferring can follow
the step of channel state
changing in time, it is a good
technology for link self-adaptive



For long time delay packet data,
AMC can improve system
capacity without add
interference to neighbor cells


HSDPA Theory

Key technology: AMC (2)
Modulation (QPSK, 16QAM) self-adaptive
Good channel state: 16QAM
Bad channel state: QPSK

CQI (Report periodically)

Node B

Coding rate (1/3, 3/4, etc.) self-adaptive
Good channel state: 3/4
Bad channel state: 1/3

Efficiently utilize the channel condition
Good channel state: higher speed
Bad channel state: lower speed

Codes adjusting
Good channel state: more codes
Bad channel state: fewer codes


HSDPA Theory

Key technology: AMC (3)
HSDPA, R99/R4 channel bearing ability comparison

16QAM and higher coding rate

Standard

Data rate (kbps)

SF

Modulation

Coding rate

R99/R4

384

8

QPSK

1/2

HSDPA

720

16

16QAM

3/4



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



As using bigger SF, system can support more users


HSDPA Theory

Key technology: AMC (4)

Multiple coding rates

HSDPA throughput, relative with modulation & coding rate

Modulation coding

Data rate

Data rate

Data rate

rate

(1 code)

(5 codes)

(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 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


HSDPA Theory

Key technology: HARQ (1)
Standard

HARQ

R99/R4

N

FEC is in high layer
ARQ is in RLC layer, channel feedback is slow

HSDPA

Y

Includes physical layer HARQ and HARQ entity in MAC-hs

MAC- hs

Remark




Hybrid Automatic Repeat reQuest (HARQ) is a
combined technology with Forward Error
Correction (FEC) and Automatic Repeat reQuest
(ARQ)




HARQ can provide flexible and subtle adjustment
for its process by cooperated with AMC

HARQ

TFRC

L2
L1
L1 HARQ


HSDPA Theory

Key technology: HARQ (2)

Advantage: improve transferring reliability
Disadvantage: lower utilization in bad
channel state
Advantage: good performance in
lower Bit Error Rate (BER)
Disadvantage: bad performance in
high BER

F
E
C
A
R
Q

H
A
R
Q

Receive

Send

Combine FEC and ARQ, each
sending packet includes error
detection bit and error correction bit

Send

Packet
Packet A

Receive

Packet
Packet A
A

Discard
Resend
whole packet
d
sen
Re

r

ent
em
r
i
equ

Lower efficiency
Longer time delay

Packet
Packet A

Packet
Packet B
B

Pac

ket

Error
Error packet
packet A
A

on
Ac

firm

Packet
Packet A
A

HARQ phase I
（ Resending is in RNC ， R99 ）

Reserve
Resend data
Packet
Packet A
A

missing
missing data
data

dr
sen
e
R

ent
rem
i
u
eq

Higher efficiency
Shorter time delay

Packet
Packet B
B

k
Pac

et

o nf
Ac

irm

Error
Error packet
packet A
A

Packet
Packet A
missing
missing
data
data

Soft
combination

HARQ phase II, III
（ Resending is in Node B, HSDPA ）


HSDPA Theory

Key technology: Quick scheduling (1)
HS- DPCCH ( ACK/ NACK and CQI )

HSDPA channel
feedback time delay
is about 8.5 TS

1 TS = 2560 Chi p

HS- SCCH

HS- SCCH

HS- PDSCH

2 TS

7. 5 TS +/ - 128 Chi p

Standard

TTI (ms)

Channel
feedback time
delay (ms)

R99

10

100 (at least)

HSDPA

Quick channel feedback

2

5.67

N TS

Remark

Supports continuous
feedback, R5 also
supports 10ms TTI

With quick channel
feedback, HSDPA
can suitably adjust
coding rate, codes,
modulation, etc. in
time according to
the channel state


HSDPA Theory

Key technology: Quick scheduling (2)
Scheduling policy

Time fairness

Traffic fairness

Every user get equal service time, but the traffic
maybe not equal, the fairest algorithm but has the
lowest traffic

Every user get the same traffic, but the time maybe
not equal, has the lower utility of system resource
because it will schedule the UE with bad channel
state

Max-C/I

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

Proportional fairness

Weighted compromise of above algorithms and has
bigger system traffic and better service fairness

UE1


HSDPA Theory

Advantage of HSDPA
Comparing item

R99/R4

HSDPA

System capacity (Mbps)

2.668

14.4

Spectrum efficiency
(Kbit/(MHz*Cell))

537.6

2795.2

System handover

Inter-frequency hard HO
Intra-frequency soft HO
Intra-frequency softer HO
Inter-system HO (GSM)

Only hard handover

Power control

Open loop, Close loop (Inner loop, Outer loop)
PC, Quick, Slow PC

HS-PDSCH adopts slow PC or even

no power control

Modulation

QPSK

QPSK, 16QAM

Link adaptive technology

Quick PC and soft HO

AMC, HARQ, Short TTI and Quick
channel feedback

MAC-hs

N/A

For faster scheduling

HSDPA
Provides various speed
with stable power
(stable power,
adjustable speed)

R99/R4
Adjust power to
guarantee service speed

(stable speed,
adjustable power)


Content
Driver to HSDPA
HSDPA Theory
HSDPA Terminal and Commercial
Situation
HSDPA Solution


HSDPA Terminal and Commercial Situation

Terminal Changing caused by HSDPA
UE changing

Powerful 3G terminals
Much 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


HSDPA Terminal and Commercial Situation

HSDPA terminal category and capability
HSDPA terminal

HSDPA handset

HSDPA pc card

HSDPA PDA

UE category

Maximum
channels

Minimal TTI
interval

Maximum service speed
(Mbps)

Category 1-6

5

3-1

1.2~3.65

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

Modulation

QPSK
16QAM

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 and Commercial Situation

HSDPA commercial process
 HSDPA standard has been determined
 HSDPA has adequate test instruments
 HSDPA technology has been tested in application
 Manufactures provide HSDPA commercial terminals in 2005
 USA, Japan and the other operators start the HSDPA network construction
 ZTE equipment are HSDPA ready







Terminals
Terminals
2005
20052Q,
2Q,several
severalmanufacture
manufacturepromote
promoteHSDPA
HSDPAtrial
trialversion
versionterminal
terminal
2005
20054Q,
4Q,promote
promotecommercial
commercialHSDPA
HSDPAterminal
terminal
Operator
Operatortotodeploy
deployHSDPA
HSDPA
Cingular
Cingularplan

plantotodeploy
deployHSDPA
HSDPAininmajor
majorcity,
city,2006;
2006;till
tillthe
theend
endofof2006,
2006,totoprovide
providethe
the
HSDPA
service
in
most
part
of
metropolitans.
HSDPA service in most part of metropolitans.
NTT
NTTDocomo
Docomowill
willdeploy
deployHSDPA
HSDPAininfirst
firstquarter
quarter2006;
2006;InInUK,
UK,mmO2

mmO2will
willlaunch
launchthe
the
service
serviceininfourth
fourthquarter
quarter2005
2005；
；ininHK
HKH3G
H3Gwill
willprovide
providecommercial
commercialservice
serviceininfirst
first
quarter
2006
quarter 2006


HSDPA Terminal and Commercial Situation

High data service brings new experience
 Adopt the HSDPA, operator can provide higher bandwidth service.
 To deploy new service.

Multi-access
Multi-access

Colorfulemail
email
Colorful

这家餐厅好像不错

是啊，
明天去吧

Multimedia Download
Download
Multimedia
NEWS

MOVIE

Cartoonmail
mail
Cartoon
MUSIC